LCOV - code coverage report
Current view: top level - libavformat - mpegts.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 999 1765 56.6 %
Date: 2018-05-20 11:54:08 Functions: 48 70 68.6 %

          Line data    Source code
       1             : /*
       2             :  * MPEG-2 transport stream (aka DVB) demuxer
       3             :  * Copyright (c) 2002-2003 Fabrice Bellard
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : #include "libavutil/buffer.h"
      23             : #include "libavutil/crc.h"
      24             : #include "libavutil/internal.h"
      25             : #include "libavutil/intreadwrite.h"
      26             : #include "libavutil/log.h"
      27             : #include "libavutil/dict.h"
      28             : #include "libavutil/mathematics.h"
      29             : #include "libavutil/opt.h"
      30             : #include "libavutil/avassert.h"
      31             : #include "libavcodec/bytestream.h"
      32             : #include "libavcodec/get_bits.h"
      33             : #include "libavcodec/opus.h"
      34             : #include "avformat.h"
      35             : #include "mpegts.h"
      36             : #include "internal.h"
      37             : #include "avio_internal.h"
      38             : #include "mpeg.h"
      39             : #include "isom.h"
      40             : 
      41             : /* maximum size in which we look for synchronization if
      42             :  * synchronization is lost */
      43             : #define MAX_RESYNC_SIZE 65536
      44             : 
      45             : #define MAX_PES_PAYLOAD 200 * 1024
      46             : 
      47             : #define MAX_MP4_DESCR_COUNT 16
      48             : 
      49             : #define MOD_UNLIKELY(modulus, dividend, divisor, prev_dividend)                \
      50             :     do {                                                                       \
      51             :         if ((prev_dividend) == 0 || (dividend) - (prev_dividend) != (divisor)) \
      52             :             (modulus) = (dividend) % (divisor);                                \
      53             :         (prev_dividend) = (dividend);                                          \
      54             :     } while (0)
      55             : 
      56             : enum MpegTSFilterType {
      57             :     MPEGTS_PES,
      58             :     MPEGTS_SECTION,
      59             :     MPEGTS_PCR,
      60             : };
      61             : 
      62             : typedef struct MpegTSFilter MpegTSFilter;
      63             : 
      64             : typedef int PESCallback (MpegTSFilter *f, const uint8_t *buf, int len,
      65             :                          int is_start, int64_t pos);
      66             : 
      67             : typedef struct MpegTSPESFilter {
      68             :     PESCallback *pes_cb;
      69             :     void *opaque;
      70             : } MpegTSPESFilter;
      71             : 
      72             : typedef void SectionCallback (MpegTSFilter *f, const uint8_t *buf, int len);
      73             : 
      74             : typedef void SetServiceCallback (void *opaque, int ret);
      75             : 
      76             : typedef struct MpegTSSectionFilter {
      77             :     int section_index;
      78             :     int section_h_size;
      79             :     int last_ver;
      80             :     unsigned crc;
      81             :     unsigned last_crc;
      82             :     uint8_t *section_buf;
      83             :     unsigned int check_crc : 1;
      84             :     unsigned int end_of_section_reached : 1;
      85             :     SectionCallback *section_cb;
      86             :     void *opaque;
      87             : } MpegTSSectionFilter;
      88             : 
      89             : struct MpegTSFilter {
      90             :     int pid;
      91             :     int es_id;
      92             :     int last_cc; /* last cc code (-1 if first packet) */
      93             :     int64_t last_pcr;
      94             :     enum MpegTSFilterType type;
      95             :     union {
      96             :         MpegTSPESFilter pes_filter;
      97             :         MpegTSSectionFilter section_filter;
      98             :     } u;
      99             : };
     100             : 
     101             : #define MAX_PIDS_PER_PROGRAM 64
     102             : struct Program {
     103             :     unsigned int id; // program id/service id
     104             :     unsigned int nb_pids;
     105             :     unsigned int pids[MAX_PIDS_PER_PROGRAM];
     106             : 
     107             :     /** have we found pmt for this program */
     108             :     int pmt_found;
     109             : };
     110             : 
     111             : struct MpegTSContext {
     112             :     const AVClass *class;
     113             :     /* user data */
     114             :     AVFormatContext *stream;
     115             :     /** raw packet size, including FEC if present */
     116             :     int raw_packet_size;
     117             : 
     118             :     int size_stat[3];
     119             :     int size_stat_count;
     120             : #define SIZE_STAT_THRESHOLD 10
     121             : 
     122             :     int64_t pos47_full;
     123             : 
     124             :     /** if true, all pids are analyzed to find streams */
     125             :     int auto_guess;
     126             : 
     127             :     /** compute exact PCR for each transport stream packet */
     128             :     int mpeg2ts_compute_pcr;
     129             : 
     130             :     /** fix dvb teletext pts                                 */
     131             :     int fix_teletext_pts;
     132             : 
     133             :     int64_t cur_pcr;    /**< used to estimate the exact PCR */
     134             :     int pcr_incr;       /**< used to estimate the exact PCR */
     135             : 
     136             :     /* data needed to handle file based ts */
     137             :     /** stop parsing loop */
     138             :     int stop_parse;
     139             :     /** packet containing Audio/Video data */
     140             :     AVPacket *pkt;
     141             :     /** to detect seek */
     142             :     int64_t last_pos;
     143             : 
     144             :     int skip_changes;
     145             :     int skip_clear;
     146             :     int skip_unknown_pmt;
     147             : 
     148             :     int scan_all_pmts;
     149             : 
     150             :     int resync_size;
     151             :     int merge_pmt_versions;
     152             : 
     153             :     /******************************************/
     154             :     /* private mpegts data */
     155             :     /* scan context */
     156             :     /** structure to keep track of Program->pids mapping */
     157             :     unsigned int nb_prg;
     158             :     struct Program *prg;
     159             : 
     160             :     int8_t crc_validity[NB_PID_MAX];
     161             :     /** filters for various streams specified by PMT + for the PAT and PMT */
     162             :     MpegTSFilter *pids[NB_PID_MAX];
     163             :     int current_pid;
     164             : };
     165             : 
     166             : #define MPEGTS_OPTIONS \
     167             :     { "resync_size",   "set size limit for looking up a new synchronization", offsetof(MpegTSContext, resync_size), AV_OPT_TYPE_INT,  { .i64 =  MAX_RESYNC_SIZE}, 0, INT_MAX,  AV_OPT_FLAG_DECODING_PARAM }
     168             : 
     169             : static const AVOption options[] = {
     170             :     MPEGTS_OPTIONS,
     171             :     {"fix_teletext_pts", "try to fix pts values of dvb teletext streams", offsetof(MpegTSContext, fix_teletext_pts), AV_OPT_TYPE_BOOL,
     172             :      {.i64 = 1}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
     173             :     {"ts_packetsize", "output option carrying the raw packet size", offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
     174             :      {.i64 = 0}, 0, 0, AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
     175             :     {"scan_all_pmts", "scan and combine all PMTs", offsetof(MpegTSContext, scan_all_pmts), AV_OPT_TYPE_BOOL,
     176             :      {.i64 = -1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM },
     177             :     {"skip_unknown_pmt", "skip PMTs for programs not advertised in the PAT", offsetof(MpegTSContext, skip_unknown_pmt), AV_OPT_TYPE_BOOL,
     178             :      {.i64 = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
     179             :     {"merge_pmt_versions", "re-use streams when PMT's version/pids change", offsetof(MpegTSContext, merge_pmt_versions), AV_OPT_TYPE_BOOL,
     180             :      {.i64 = 0}, 0, 1,  AV_OPT_FLAG_DECODING_PARAM },
     181             :     {"skip_changes", "skip changing / adding streams / programs", offsetof(MpegTSContext, skip_changes), AV_OPT_TYPE_BOOL,
     182             :      {.i64 = 0}, 0, 1, 0 },
     183             :     {"skip_clear", "skip clearing programs", offsetof(MpegTSContext, skip_clear), AV_OPT_TYPE_BOOL,
     184             :      {.i64 = 0}, 0, 1, 0 },
     185             :     { NULL },
     186             : };
     187             : 
     188             : static const AVClass mpegts_class = {
     189             :     .class_name = "mpegts demuxer",
     190             :     .item_name  = av_default_item_name,
     191             :     .option     = options,
     192             :     .version    = LIBAVUTIL_VERSION_INT,
     193             : };
     194             : 
     195             : static const AVOption raw_options[] = {
     196             :     MPEGTS_OPTIONS,
     197             :     { "compute_pcr",   "compute exact PCR for each transport stream packet",
     198             :           offsetof(MpegTSContext, mpeg2ts_compute_pcr), AV_OPT_TYPE_BOOL,
     199             :           { .i64 = 0 }, 0, 1,  AV_OPT_FLAG_DECODING_PARAM },
     200             :     { "ts_packetsize", "output option carrying the raw packet size",
     201             :       offsetof(MpegTSContext, raw_packet_size), AV_OPT_TYPE_INT,
     202             :       { .i64 = 0 }, 0, 0,
     203             :       AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_EXPORT | AV_OPT_FLAG_READONLY },
     204             :     { NULL },
     205             : };
     206             : 
     207             : static const AVClass mpegtsraw_class = {
     208             :     .class_name = "mpegtsraw demuxer",
     209             :     .item_name  = av_default_item_name,
     210             :     .option     = raw_options,
     211             :     .version    = LIBAVUTIL_VERSION_INT,
     212             : };
     213             : 
     214             : /* TS stream handling */
     215             : 
     216             : enum MpegTSState {
     217             :     MPEGTS_HEADER = 0,
     218             :     MPEGTS_PESHEADER,
     219             :     MPEGTS_PESHEADER_FILL,
     220             :     MPEGTS_PAYLOAD,
     221             :     MPEGTS_SKIP,
     222             : };
     223             : 
     224             : /* enough for PES header + length */
     225             : #define PES_START_SIZE  6
     226             : #define PES_HEADER_SIZE 9
     227             : #define MAX_PES_HEADER_SIZE (9 + 255)
     228             : 
     229             : typedef struct PESContext {
     230             :     int pid;
     231             :     int pcr_pid; /**< if -1 then all packets containing PCR are considered */
     232             :     int stream_type;
     233             :     MpegTSContext *ts;
     234             :     AVFormatContext *stream;
     235             :     AVStream *st;
     236             :     AVStream *sub_st; /**< stream for the embedded AC3 stream in HDMV TrueHD */
     237             :     enum MpegTSState state;
     238             :     /* used to get the format */
     239             :     int data_index;
     240             :     int flags; /**< copied to the AVPacket flags */
     241             :     int total_size;
     242             :     int pes_header_size;
     243             :     int extended_stream_id;
     244             :     uint8_t stream_id;
     245             :     int64_t pts, dts;
     246             :     int64_t ts_packet_pos; /**< position of first TS packet of this PES packet */
     247             :     uint8_t header[MAX_PES_HEADER_SIZE];
     248             :     AVBufferRef *buffer;
     249             :     SLConfigDescr sl;
     250             : } PESContext;
     251             : 
     252             : extern AVInputFormat ff_mpegts_demuxer;
     253             : 
     254        1177 : static struct Program * get_program(MpegTSContext *ts, unsigned int programid)
     255             : {
     256             :     int i;
     257        1177 :     for (i = 0; i < ts->nb_prg; i++) {
     258        1177 :         if (ts->prg[i].id == programid) {
     259        1177 :             return &ts->prg[i];
     260             :         }
     261             :     }
     262           0 :     return NULL;
     263             : }
     264             : 
     265         150 : static void clear_avprogram(MpegTSContext *ts, unsigned int programid)
     266             : {
     267         150 :     AVProgram *prg = NULL;
     268             :     int i;
     269             : 
     270         150 :     for (i = 0; i < ts->stream->nb_programs; i++)
     271         150 :         if (ts->stream->programs[i]->id == programid) {
     272         150 :             prg = ts->stream->programs[i];
     273         150 :             break;
     274             :         }
     275         150 :     if (!prg)
     276           0 :         return;
     277         150 :     prg->nb_stream_indexes = 0;
     278             : }
     279             : 
     280         150 : static void clear_program(MpegTSContext *ts, unsigned int programid)
     281             : {
     282             :     int i;
     283             : 
     284         150 :     clear_avprogram(ts, programid);
     285         300 :     for (i = 0; i < ts->nb_prg; i++)
     286         150 :         if (ts->prg[i].id == programid) {
     287         150 :             ts->prg[i].nb_pids = 0;
     288         150 :             ts->prg[i].pmt_found = 0;
     289             :         }
     290         150 : }
     291             : 
     292         213 : static void clear_programs(MpegTSContext *ts)
     293             : {
     294         213 :     av_freep(&ts->prg);
     295         213 :     ts->nb_prg = 0;
     296         213 : }
     297             : 
     298         180 : static void add_pat_entry(MpegTSContext *ts, unsigned int programid)
     299             : {
     300             :     struct Program *p;
     301         180 :     if (av_reallocp_array(&ts->prg, ts->nb_prg + 1, sizeof(*ts->prg)) < 0) {
     302           0 :         ts->nb_prg = 0;
     303           0 :         return;
     304             :     }
     305         180 :     p = &ts->prg[ts->nb_prg];
     306         180 :     p->id = programid;
     307         180 :     p->nb_pids = 0;
     308         180 :     p->pmt_found = 0;
     309         180 :     ts->nb_prg++;
     310             : }
     311             : 
     312         965 : static void add_pid_to_pmt(MpegTSContext *ts, unsigned int programid,
     313             :                            unsigned int pid)
     314             : {
     315         965 :     struct Program *p = get_program(ts, programid);
     316             :     int i;
     317         965 :     if (!p)
     318           0 :         return;
     319             : 
     320         965 :     if (p->nb_pids >= MAX_PIDS_PER_PROGRAM)
     321           0 :         return;
     322             : 
     323        1822 :     for (i = 0; i < p->nb_pids; i++)
     324        1133 :         if (p->pids[i] == pid)
     325         276 :             return;
     326             : 
     327         689 :     p->pids[p->nb_pids++] = pid;
     328             : }
     329             : 
     330         212 : static void set_pmt_found(MpegTSContext *ts, unsigned int programid)
     331             : {
     332         212 :     struct Program *p = get_program(ts, programid);
     333         212 :     if (!p)
     334           0 :         return;
     335             : 
     336         212 :     p->pmt_found = 1;
     337             : }
     338             : 
     339         212 : static void update_av_program_info(AVFormatContext *s, unsigned int programid,
     340             :                                    unsigned int pid, int version)
     341             : {
     342             :     int i;
     343         212 :     for (i = 0; i < s->nb_programs; i++) {
     344         212 :         AVProgram *program = s->programs[i];
     345         212 :         if (program->id == programid) {
     346         212 :             int old_pcr_pid = program->pcr_pid,
     347         212 :                 old_version = program->pmt_version;
     348         212 :             program->pcr_pid = pid;
     349         212 :             program->pmt_version = version;
     350             : 
     351         212 :             if (old_version != -1 && old_version != version) {
     352           3 :                 av_log(s, AV_LOG_VERBOSE,
     353             :                        "detected PMT change (program=%d, version=%d/%d, pcr_pid=0x%x/0x%x)\n",
     354             :                        programid, old_version, version, old_pcr_pid, pid);
     355             :             }
     356         212 :             break;
     357             :         }
     358             :     }
     359         212 : }
     360             : 
     361             : /**
     362             :  * @brief discard_pid() decides if the pid is to be discarded according
     363             :  *                      to caller's programs selection
     364             :  * @param ts    : - TS context
     365             :  * @param pid   : - pid
     366             :  * @return 1 if the pid is only comprised in programs that have .discard=AVDISCARD_ALL
     367             :  *         0 otherwise
     368             :  */
     369      271715 : static int discard_pid(MpegTSContext *ts, unsigned int pid)
     370             : {
     371             :     int i, j, k;
     372      271715 :     int used = 0, discarded = 0;
     373             :     struct Program *p;
     374             : 
     375             :     /* If none of the programs have .discard=AVDISCARD_ALL then there's
     376             :      * no way we have to discard this packet */
     377      539674 :     for (k = 0; k < ts->stream->nb_programs; k++)
     378      267959 :         if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
     379           0 :             break;
     380      271715 :     if (k == ts->stream->nb_programs)
     381      271715 :         return 0;
     382             : 
     383           0 :     for (i = 0; i < ts->nb_prg; i++) {
     384           0 :         p = &ts->prg[i];
     385           0 :         for (j = 0; j < p->nb_pids; j++) {
     386           0 :             if (p->pids[j] != pid)
     387           0 :                 continue;
     388             :             // is program with id p->id set to be discarded?
     389           0 :             for (k = 0; k < ts->stream->nb_programs; k++) {
     390           0 :                 if (ts->stream->programs[k]->id == p->id) {
     391           0 :                     if (ts->stream->programs[k]->discard == AVDISCARD_ALL)
     392           0 :                         discarded++;
     393             :                     else
     394           0 :                         used++;
     395             :                 }
     396             :             }
     397             :         }
     398             :     }
     399             : 
     400           0 :     return !used && discarded;
     401             : }
     402             : 
     403             : /**
     404             :  *  Assemble PES packets out of TS packets, and then call the "section_cb"
     405             :  *  function when they are complete.
     406             :  */
     407        7305 : static void write_section_data(MpegTSContext *ts, MpegTSFilter *tss1,
     408             :                                const uint8_t *buf, int buf_size, int is_start)
     409             : {
     410        7305 :     MpegTSSectionFilter *tss = &tss1->u.section_filter;
     411        7305 :     uint8_t *cur_section_buf = NULL;
     412             :     int len, offset;
     413             : 
     414        7305 :     if (is_start) {
     415        7305 :         memcpy(tss->section_buf, buf, buf_size);
     416        7305 :         tss->section_index = buf_size;
     417        7305 :         tss->section_h_size = -1;
     418        7305 :         tss->end_of_section_reached = 0;
     419             :     } else {
     420           0 :         if (tss->end_of_section_reached)
     421           0 :             return;
     422           0 :         len = MAX_SECTION_SIZE - tss->section_index;
     423           0 :         if (buf_size < len)
     424           0 :             len = buf_size;
     425           0 :         memcpy(tss->section_buf + tss->section_index, buf, len);
     426           0 :         tss->section_index += len;
     427             :     }
     428             : 
     429        7305 :     offset = 0;
     430        7305 :     cur_section_buf = tss->section_buf;
     431       21915 :     while (cur_section_buf - tss->section_buf < MAX_SECTION_SIZE && cur_section_buf[0] != 0xff) {
     432             :         /* compute section length if possible */
     433        7513 :         if (tss->section_h_size == -1 && tss->section_index - offset >= 3) {
     434        7305 :             len = (AV_RB16(cur_section_buf + 1) & 0xfff) + 3;
     435        7305 :             if (len > MAX_SECTION_SIZE)
     436           0 :                 return;
     437        7305 :             tss->section_h_size = len;
     438             :         }
     439             : 
     440       14818 :         if (tss->section_h_size != -1 &&
     441       14610 :             tss->section_index >= offset + tss->section_h_size) {
     442        7305 :             int crc_valid = 1;
     443        7305 :             tss->end_of_section_reached = 1;
     444             : 
     445        7305 :             if (tss->check_crc) {
     446        7305 :                 crc_valid = !av_crc(av_crc_get_table(AV_CRC_32_IEEE), -1, cur_section_buf, tss->section_h_size);
     447        7305 :                 if (tss->section_h_size >= 4)
     448        7305 :                     tss->crc = AV_RB32(cur_section_buf + tss->section_h_size - 4);
     449             : 
     450        7305 :                 if (crc_valid) {
     451        7305 :                     ts->crc_validity[ tss1->pid ] = 100;
     452           0 :                 }else if (ts->crc_validity[ tss1->pid ] > -10) {
     453           0 :                     ts->crc_validity[ tss1->pid ]--;
     454             :                 }else
     455           0 :                     crc_valid = 2;
     456             :             }
     457        7305 :             if (crc_valid) {
     458        7305 :                 tss->section_cb(tss1, cur_section_buf, tss->section_h_size);
     459        7305 :                 if (crc_valid != 1)
     460           0 :                     tss->last_ver = -1;
     461             :             }
     462             : 
     463        7305 :             cur_section_buf += tss->section_h_size;
     464        7305 :             offset += tss->section_h_size;
     465        7305 :             tss->section_h_size = -1;
     466             :         } else {
     467         208 :             tss->end_of_section_reached = 0;
     468         208 :             break;
     469             :         }
     470             :     }
     471             : }
     472             : 
     473         171 : static MpegTSFilter *mpegts_open_filter(MpegTSContext *ts, unsigned int pid,
     474             :                                         enum MpegTSFilterType type)
     475             : {
     476             :     MpegTSFilter *filter;
     477             : 
     478         171 :     av_log(ts->stream, AV_LOG_TRACE, "Filter: pid=0x%x type=%d\n", pid, type);
     479             : 
     480         171 :     if (pid >= NB_PID_MAX || ts->pids[pid])
     481           0 :         return NULL;
     482         171 :     filter = av_mallocz(sizeof(MpegTSFilter));
     483         171 :     if (!filter)
     484           0 :         return NULL;
     485         171 :     ts->pids[pid] = filter;
     486             : 
     487         171 :     filter->type    = type;
     488         171 :     filter->pid     = pid;
     489         171 :     filter->es_id   = -1;
     490         171 :     filter->last_cc = -1;
     491         171 :     filter->last_pcr= -1;
     492             : 
     493         171 :     return filter;
     494             : }
     495             : 
     496         100 : static MpegTSFilter *mpegts_open_section_filter(MpegTSContext *ts,
     497             :                                                 unsigned int pid,
     498             :                                                 SectionCallback *section_cb,
     499             :                                                 void *opaque,
     500             :                                                 int check_crc)
     501             : {
     502             :     MpegTSFilter *filter;
     503             :     MpegTSSectionFilter *sec;
     504             : 
     505         100 :     if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_SECTION)))
     506           0 :         return NULL;
     507         100 :     sec = &filter->u.section_filter;
     508         100 :     sec->section_cb  = section_cb;
     509         100 :     sec->opaque      = opaque;
     510         100 :     sec->section_buf = av_mallocz(MAX_SECTION_SIZE);
     511         100 :     sec->check_crc   = check_crc;
     512         100 :     sec->last_ver    = -1;
     513             : 
     514         100 :     if (!sec->section_buf) {
     515           0 :         av_free(filter);
     516           0 :         return NULL;
     517             :     }
     518         100 :     return filter;
     519             : }
     520             : 
     521          71 : static MpegTSFilter *mpegts_open_pes_filter(MpegTSContext *ts, unsigned int pid,
     522             :                                             PESCallback *pes_cb,
     523             :                                             void *opaque)
     524             : {
     525             :     MpegTSFilter *filter;
     526             :     MpegTSPESFilter *pes;
     527             : 
     528          71 :     if (!(filter = mpegts_open_filter(ts, pid, MPEGTS_PES)))
     529           0 :         return NULL;
     530             : 
     531          71 :     pes = &filter->u.pes_filter;
     532          71 :     pes->pes_cb = pes_cb;
     533          71 :     pes->opaque = opaque;
     534          71 :     return filter;
     535             : }
     536             : 
     537           0 : static MpegTSFilter *mpegts_open_pcr_filter(MpegTSContext *ts, unsigned int pid)
     538             : {
     539           0 :     return mpegts_open_filter(ts, pid, MPEGTS_PCR);
     540             : }
     541             : 
     542         171 : static void mpegts_close_filter(MpegTSContext *ts, MpegTSFilter *filter)
     543             : {
     544             :     int pid;
     545             : 
     546         171 :     pid = filter->pid;
     547         171 :     if (filter->type == MPEGTS_SECTION)
     548         100 :         av_freep(&filter->u.section_filter.section_buf);
     549          71 :     else if (filter->type == MPEGTS_PES) {
     550          71 :         PESContext *pes = filter->u.pes_filter.opaque;
     551          71 :         av_buffer_unref(&pes->buffer);
     552             :         /* referenced private data will be freed later in
     553             :          * avformat_close_input */
     554          71 :         if (!((PESContext *)filter->u.pes_filter.opaque)->st) {
     555          14 :             av_freep(&filter->u.pes_filter.opaque);
     556             :         }
     557             :     }
     558             : 
     559         171 :     av_free(filter);
     560         171 :     ts->pids[pid] = NULL;
     561         171 : }
     562             : 
     563       32640 : static int analyze(const uint8_t *buf, int size, int packet_size,
     564             :                    int probe)
     565             : {
     566             :     int stat[TS_MAX_PACKET_SIZE];
     567       32640 :     int stat_all = 0;
     568             :     int i;
     569       32640 :     int best_score = 0;
     570             : 
     571       32640 :     memset(stat, 0, packet_size * sizeof(*stat));
     572             : 
     573   371635952 :     for (i = 0; i < size - 3; i++) {
     574   371603312 :         if (buf[i] == 0x47) {
     575      673309 :             int pid = AV_RB16(buf+1) & 0x1FFF;
     576      673309 :             int asc = buf[i + 3] & 0x30;
     577      673309 :             if (!probe || pid == 0x1FFF || asc) {
     578      550704 :                 int x = i % packet_size;
     579      550704 :                 stat[x]++;
     580      550704 :                 stat_all++;
     581      550704 :                 if (stat[x] > best_score) {
     582       49541 :                     best_score = stat[x];
     583             :                 }
     584             :             }
     585             :         }
     586             :     }
     587             : 
     588       32640 :     return best_score - FFMAX(stat_all - 10*best_score, 0)/10;
     589             : }
     590             : 
     591             : /* autodetect fec presence. Must have at least 1024 bytes  */
     592          33 : static int get_packet_size(const uint8_t *buf, int size)
     593             : {
     594             :     int score, fec_score, dvhs_score;
     595             : 
     596          33 :     if (size < (TS_FEC_PACKET_SIZE * 5 + 1))
     597           0 :         return AVERROR_INVALIDDATA;
     598             : 
     599          33 :     score      = analyze(buf, size, TS_PACKET_SIZE,      0);
     600          33 :     dvhs_score = analyze(buf, size, TS_DVHS_PACKET_SIZE, 0);
     601          33 :     fec_score  = analyze(buf, size, TS_FEC_PACKET_SIZE,  0);
     602          33 :     av_log(NULL, AV_LOG_TRACE, "score: %d, dvhs_score: %d, fec_score: %d \n",
     603             :             score, dvhs_score, fec_score);
     604             : 
     605          33 :     if (score > fec_score && score > dvhs_score)
     606          33 :         return TS_PACKET_SIZE;
     607           0 :     else if (dvhs_score > score && dvhs_score > fec_score)
     608           0 :         return TS_DVHS_PACKET_SIZE;
     609           0 :     else if (score < fec_score && dvhs_score < fec_score)
     610           0 :         return TS_FEC_PACKET_SIZE;
     611             :     else
     612           0 :         return AVERROR_INVALIDDATA;
     613             : }
     614             : 
     615             : typedef struct SectionHeader {
     616             :     uint8_t tid;
     617             :     uint16_t id;
     618             :     uint8_t version;
     619             :     uint8_t sec_num;
     620             :     uint8_t last_sec_num;
     621             : } SectionHeader;
     622             : 
     623        6705 : static int skip_identical(const SectionHeader *h, MpegTSSectionFilter *tssf)
     624             : {
     625        6705 :     if (h->version == tssf->last_ver && tssf->last_crc == tssf->crc)
     626        6183 :         return 1;
     627             : 
     628         522 :     tssf->last_ver = h->version;
     629         522 :     tssf->last_crc = tssf->crc;
     630             : 
     631         522 :     return 0;
     632             : }
     633             : 
     634       32110 : static inline int get8(const uint8_t **pp, const uint8_t *p_end)
     635             : {
     636             :     const uint8_t *p;
     637             :     int c;
     638             : 
     639       32110 :     p = *pp;
     640       32110 :     if (p >= p_end)
     641         765 :         return AVERROR_INVALIDDATA;
     642       31345 :     c   = *p++;
     643       31345 :     *pp = p;
     644       31345 :     return c;
     645             : }
     646             : 
     647        9605 : static inline int get16(const uint8_t **pp, const uint8_t *p_end)
     648             : {
     649             :     const uint8_t *p;
     650             :     int c;
     651             : 
     652        9605 :     p = *pp;
     653        9605 :     if (1 >= p_end - p)
     654         310 :         return AVERROR_INVALIDDATA;
     655        9295 :     c   = AV_RB16(p);
     656        9295 :     p  += 2;
     657        9295 :     *pp = p;
     658        9295 :     return c;
     659             : }
     660             : 
     661             : /* read and allocate a DVB string preceded by its length */
     662         260 : static char *getstr8(const uint8_t **pp, const uint8_t *p_end)
     663             : {
     664             :     int len;
     665             :     const uint8_t *p;
     666             :     char *str;
     667             : 
     668         260 :     p   = *pp;
     669         260 :     len = get8(&p, p_end);
     670         260 :     if (len < 0)
     671           0 :         return NULL;
     672         260 :     if (len > p_end - p)
     673           0 :         return NULL;
     674         260 :     str = av_malloc(len + 1);
     675         260 :     if (!str)
     676           0 :         return NULL;
     677         260 :     memcpy(str, p, len);
     678         260 :     str[len] = '\0';
     679         260 :     p  += len;
     680         260 :     *pp = p;
     681         260 :     return str;
     682             : }
     683             : 
     684        7305 : static int parse_section_header(SectionHeader *h,
     685             :                                 const uint8_t **pp, const uint8_t *p_end)
     686             : {
     687             :     int val;
     688             : 
     689        7305 :     val = get8(pp, p_end);
     690        7305 :     if (val < 0)
     691           0 :         return val;
     692        7305 :     h->tid = val;
     693        7305 :     *pp += 2;
     694        7305 :     val  = get16(pp, p_end);
     695        7305 :     if (val < 0)
     696           0 :         return val;
     697        7305 :     h->id = val;
     698        7305 :     val = get8(pp, p_end);
     699        7305 :     if (val < 0)
     700           0 :         return val;
     701        7305 :     h->version = (val >> 1) & 0x1f;
     702        7305 :     val = get8(pp, p_end);
     703        7305 :     if (val < 0)
     704           0 :         return val;
     705        7305 :     h->sec_num = val;
     706        7305 :     val = get8(pp, p_end);
     707        7305 :     if (val < 0)
     708           0 :         return val;
     709        7305 :     h->last_sec_num = val;
     710        7305 :     return 0;
     711             : }
     712             : 
     713             : typedef struct StreamType {
     714             :     uint32_t stream_type;
     715             :     enum AVMediaType codec_type;
     716             :     enum AVCodecID codec_id;
     717             : } StreamType;
     718             : 
     719             : static const StreamType ISO_types[] = {
     720             :     { 0x01, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
     721             :     { 0x02, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO },
     722             :     { 0x03, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3        },
     723             :     { 0x04, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3        },
     724             :     { 0x0f, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC        },
     725             :     { 0x10, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG4      },
     726             :     /* Makito encoder sets stream type 0x11 for AAC,
     727             :      * so auto-detect LOAS/LATM instead of hardcoding it. */
     728             : #if !CONFIG_LOAS_DEMUXER
     729             :     { 0x11, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC_LATM   }, /* LATM syntax */
     730             : #endif
     731             :     { 0x1b, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264       },
     732             :     { 0x1c, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AAC        },
     733             :     { 0x20, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H264       },
     734             :     { 0x21, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_JPEG2000   },
     735             :     { 0x24, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC       },
     736             :     { 0x42, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_CAVS       },
     737             :     { 0xd1, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC      },
     738             :     { 0xea, AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1        },
     739             :     { 0 },
     740             : };
     741             : 
     742             : static const StreamType HDMV_types[] = {
     743             :     { 0x80, AVMEDIA_TYPE_AUDIO,    AV_CODEC_ID_PCM_BLURAY        },
     744             :     { 0x81, AVMEDIA_TYPE_AUDIO,    AV_CODEC_ID_AC3               },
     745             :     { 0x82, AVMEDIA_TYPE_AUDIO,    AV_CODEC_ID_DTS               },
     746             :     { 0x83, AVMEDIA_TYPE_AUDIO,    AV_CODEC_ID_TRUEHD            },
     747             :     { 0x84, AVMEDIA_TYPE_AUDIO,    AV_CODEC_ID_EAC3              },
     748             :     { 0x85, AVMEDIA_TYPE_AUDIO,    AV_CODEC_ID_DTS               }, /* DTS HD */
     749             :     { 0x86, AVMEDIA_TYPE_AUDIO,    AV_CODEC_ID_DTS               }, /* DTS HD MASTER*/
     750             :     { 0xa1, AVMEDIA_TYPE_AUDIO,    AV_CODEC_ID_EAC3              }, /* E-AC3 Secondary Audio */
     751             :     { 0xa2, AVMEDIA_TYPE_AUDIO,    AV_CODEC_ID_DTS               }, /* DTS Express Secondary Audio */
     752             :     { 0x90, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_PGS_SUBTITLE },
     753             :     { 0x92, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_HDMV_TEXT_SUBTITLE },
     754             :     { 0 },
     755             : };
     756             : 
     757             : /* SCTE types */
     758             : static const StreamType SCTE_types[] = {
     759             :     { 0x86, AVMEDIA_TYPE_DATA,  AV_CODEC_ID_SCTE_35    },
     760             :     { 0 },
     761             : };
     762             : 
     763             : /* ATSC ? */
     764             : static const StreamType MISC_types[] = {
     765             :     { 0x81, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3 },
     766             :     { 0x8a, AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS },
     767             :     { 0 },
     768             : };
     769             : 
     770             : static const StreamType REGD_types[] = {
     771             :     { MKTAG('d', 'r', 'a', 'c'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_DIRAC },
     772             :     { MKTAG('A', 'C', '-', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_AC3   },
     773             :     { MKTAG('B', 'S', 'S', 'D'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_S302M },
     774             :     { MKTAG('D', 'T', 'S', '1'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS   },
     775             :     { MKTAG('D', 'T', 'S', '2'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS   },
     776             :     { MKTAG('D', 'T', 'S', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_DTS   },
     777             :     { MKTAG('E', 'A', 'C', '3'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_EAC3  },
     778             :     { MKTAG('H', 'E', 'V', 'C'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_HEVC  },
     779             :     { MKTAG('K', 'L', 'V', 'A'), AVMEDIA_TYPE_DATA,  AV_CODEC_ID_SMPTE_KLV },
     780             :     { MKTAG('I', 'D', '3', ' '), AVMEDIA_TYPE_DATA,  AV_CODEC_ID_TIMED_ID3 },
     781             :     { MKTAG('V', 'C', '-', '1'), AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_VC1   },
     782             :     { MKTAG('O', 'p', 'u', 's'), AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_OPUS  },
     783             :     { 0 },
     784             : };
     785             : 
     786             : static const StreamType METADATA_types[] = {
     787             :     { MKTAG('K','L','V','A'), AVMEDIA_TYPE_DATA, AV_CODEC_ID_SMPTE_KLV },
     788             :     { MKTAG('I','D','3',' '), AVMEDIA_TYPE_DATA, AV_CODEC_ID_TIMED_ID3 },
     789             :     { 0 },
     790             : };
     791             : 
     792             : /* descriptor present */
     793             : static const StreamType DESC_types[] = {
     794             :     { 0x6a, AVMEDIA_TYPE_AUDIO,    AV_CODEC_ID_AC3          }, /* AC-3 descriptor */
     795             :     { 0x7a, AVMEDIA_TYPE_AUDIO,    AV_CODEC_ID_EAC3         }, /* E-AC-3 descriptor */
     796             :     { 0x7b, AVMEDIA_TYPE_AUDIO,    AV_CODEC_ID_DTS          },
     797             :     { 0x56, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_TELETEXT },
     798             :     { 0x59, AVMEDIA_TYPE_SUBTITLE, AV_CODEC_ID_DVB_SUBTITLE }, /* subtitling descriptor */
     799             :     { 0 },
     800             : };
     801             : 
     802          71 : static void mpegts_find_stream_type(AVStream *st,
     803             :                                     uint32_t stream_type,
     804             :                                     const StreamType *types)
     805             : {
     806         331 :     for (; types->stream_type; types++)
     807         314 :         if (stream_type == types->stream_type) {
     808          58 :             if (st->codecpar->codec_type != types->codec_type ||
     809           4 :                 st->codecpar->codec_id   != types->codec_id) {
     810          53 :                 st->codecpar->codec_type = types->codec_type;
     811          53 :                 st->codecpar->codec_id   = types->codec_id;
     812          53 :                 st->internal->need_context_update = 1;
     813             :             }
     814          54 :             st->request_probe        = 0;
     815          54 :             return;
     816             :         }
     817             : }
     818             : 
     819          53 : static int mpegts_set_stream_info(AVStream *st, PESContext *pes,
     820             :                                   uint32_t stream_type, uint32_t prog_reg_desc)
     821             : {
     822          53 :     int old_codec_type = st->codecpar->codec_type;
     823          53 :     int old_codec_id   = st->codecpar->codec_id;
     824          53 :     int old_codec_tag  = st->codecpar->codec_tag;
     825             : 
     826          53 :     if (avcodec_is_open(st->internal->avctx)) {
     827           0 :         av_log(pes->stream, AV_LOG_DEBUG, "cannot set stream info, internal codec is open\n");
     828           0 :         return 0;
     829             :     }
     830             : 
     831          53 :     avpriv_set_pts_info(st, 33, 1, 90000);
     832          53 :     st->priv_data         = pes;
     833          53 :     st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
     834          53 :     st->codecpar->codec_id   = AV_CODEC_ID_NONE;
     835          53 :     st->need_parsing      = AVSTREAM_PARSE_FULL;
     836          53 :     pes->st          = st;
     837          53 :     pes->stream_type = stream_type;
     838             : 
     839          53 :     av_log(pes->stream, AV_LOG_DEBUG,
     840             :            "stream=%d stream_type=%x pid=%x prog_reg_desc=%.4s\n",
     841             :            st->index, pes->stream_type, pes->pid, (char *)&prog_reg_desc);
     842             : 
     843          53 :     st->codecpar->codec_tag = pes->stream_type;
     844             : 
     845          53 :     mpegts_find_stream_type(st, pes->stream_type, ISO_types);
     846          53 :     if (pes->stream_type == 4 || pes->stream_type == 0x0f)
     847           4 :         st->request_probe = 50;
     848         106 :     if ((prog_reg_desc == AV_RL32("HDMV") ||
     849          53 :          prog_reg_desc == AV_RL32("HDPR")) &&
     850           0 :         st->codecpar->codec_id == AV_CODEC_ID_NONE) {
     851           0 :         mpegts_find_stream_type(st, pes->stream_type, HDMV_types);
     852           0 :         if (pes->stream_type == 0x83) {
     853             :             // HDMV TrueHD streams also contain an AC3 coded version of the
     854             :             // audio track - add a second stream for this
     855             :             AVStream *sub_st;
     856             :             // priv_data cannot be shared between streams
     857           0 :             PESContext *sub_pes = av_malloc(sizeof(*sub_pes));
     858           0 :             if (!sub_pes)
     859           0 :                 return AVERROR(ENOMEM);
     860           0 :             memcpy(sub_pes, pes, sizeof(*sub_pes));
     861             : 
     862           0 :             sub_st = avformat_new_stream(pes->stream, NULL);
     863           0 :             if (!sub_st) {
     864           0 :                 av_free(sub_pes);
     865           0 :                 return AVERROR(ENOMEM);
     866             :             }
     867             : 
     868           0 :             sub_st->id = pes->pid;
     869           0 :             avpriv_set_pts_info(sub_st, 33, 1, 90000);
     870           0 :             sub_st->priv_data         = sub_pes;
     871           0 :             sub_st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
     872           0 :             sub_st->codecpar->codec_id   = AV_CODEC_ID_AC3;
     873           0 :             sub_st->need_parsing      = AVSTREAM_PARSE_FULL;
     874           0 :             sub_pes->sub_st           = pes->sub_st = sub_st;
     875             :         }
     876             :     }
     877          53 :     if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
     878           8 :         mpegts_find_stream_type(st, pes->stream_type, MISC_types);
     879          53 :     if (st->codecpar->codec_id == AV_CODEC_ID_NONE) {
     880           5 :         st->codecpar->codec_id  = old_codec_id;
     881           5 :         st->codecpar->codec_type = old_codec_type;
     882             :     }
     883         101 :     if ((st->codecpar->codec_id == AV_CODEC_ID_NONE ||
     884          57 :             (st->request_probe > 0 && st->request_probe < AVPROBE_SCORE_STREAM_RETRY / 5)) &&
     885          10 :         st->probe_packets > 0 &&
     886             :         stream_type == STREAM_TYPE_PRIVATE_DATA) {
     887           3 :         st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
     888           3 :         st->codecpar->codec_id   = AV_CODEC_ID_BIN_DATA;
     889           3 :         st->request_probe = AVPROBE_SCORE_STREAM_RETRY / 5;
     890             :     }
     891             : 
     892             :     /* queue a context update if properties changed */
     893          55 :     if (old_codec_type != st->codecpar->codec_type ||
     894           4 :         old_codec_id   != st->codecpar->codec_id   ||
     895           2 :         old_codec_tag  != st->codecpar->codec_tag)
     896          53 :         st->internal->need_context_update = 1;
     897             : 
     898          53 :     return 0;
     899             : }
     900             : 
     901       38426 : static void reset_pes_packet_state(PESContext *pes)
     902             : {
     903       38426 :     pes->pts        = AV_NOPTS_VALUE;
     904       38426 :     pes->dts        = AV_NOPTS_VALUE;
     905       38426 :     pes->data_index = 0;
     906       38426 :     pes->flags      = 0;
     907       38426 :     av_buffer_unref(&pes->buffer);
     908       38426 : }
     909             : 
     910           0 : static void new_data_packet(const uint8_t *buffer, int len, AVPacket *pkt)
     911             : {
     912           0 :     av_init_packet(pkt);
     913           0 :     pkt->data = (uint8_t *)buffer;
     914           0 :     pkt->size = len;
     915           0 : }
     916             : 
     917       19818 : static int new_pes_packet(PESContext *pes, AVPacket *pkt)
     918             : {
     919             :     char *sd;
     920             : 
     921       19818 :     av_init_packet(pkt);
     922             : 
     923       19818 :     pkt->buf  = pes->buffer;
     924       19818 :     pkt->data = pes->buffer->data;
     925       19818 :     pkt->size = pes->data_index;
     926             : 
     927       37742 :     if (pes->total_size != MAX_PES_PAYLOAD &&
     928       17924 :         pes->pes_header_size + pes->data_index != pes->total_size +
     929             :         PES_START_SIZE) {
     930          47 :         av_log(pes->stream, AV_LOG_WARNING, "PES packet size mismatch\n");
     931          47 :         pes->flags |= AV_PKT_FLAG_CORRUPT;
     932             :     }
     933       19818 :     memset(pkt->data + pkt->size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
     934             : 
     935             :     // Separate out the AC3 substream from an HDMV combined TrueHD/AC3 PID
     936       19818 :     if (pes->sub_st && pes->stream_type == 0x83 && pes->extended_stream_id == 0x76)
     937           0 :         pkt->stream_index = pes->sub_st->index;
     938             :     else
     939       19818 :         pkt->stream_index = pes->st->index;
     940       19818 :     pkt->pts = pes->pts;
     941       19818 :     pkt->dts = pes->dts;
     942             :     /* store position of first TS packet of this PES packet */
     943       19818 :     pkt->pos   = pes->ts_packet_pos;
     944       19818 :     pkt->flags = pes->flags;
     945             : 
     946       19818 :     pes->buffer = NULL;
     947       19818 :     reset_pes_packet_state(pes);
     948             : 
     949       19818 :     sd = av_packet_new_side_data(pkt, AV_PKT_DATA_MPEGTS_STREAM_ID, 1);
     950       19818 :     if (!sd)
     951           0 :         return AVERROR(ENOMEM);
     952       19818 :     *sd = pes->stream_id;
     953             : 
     954       19818 :     return 0;
     955             : }
     956             : 
     957           0 : static uint64_t get_ts64(GetBitContext *gb, int bits)
     958             : {
     959           0 :     if (get_bits_left(gb) < bits)
     960           0 :         return AV_NOPTS_VALUE;
     961           0 :     return get_bits64(gb, bits);
     962             : }
     963             : 
     964           0 : static int read_sl_header(PESContext *pes, SLConfigDescr *sl,
     965             :                           const uint8_t *buf, int buf_size)
     966             : {
     967             :     GetBitContext gb;
     968           0 :     int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
     969           0 :     int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
     970           0 :     int dts_flag = -1, cts_flag = -1;
     971           0 :     int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
     972             :     uint8_t buf_padded[128 + AV_INPUT_BUFFER_PADDING_SIZE];
     973           0 :     int buf_padded_size = FFMIN(buf_size, sizeof(buf_padded) - AV_INPUT_BUFFER_PADDING_SIZE);
     974             : 
     975           0 :     memcpy(buf_padded, buf, buf_padded_size);
     976             : 
     977           0 :     init_get_bits(&gb, buf_padded, buf_padded_size * 8);
     978             : 
     979           0 :     if (sl->use_au_start)
     980           0 :         au_start_flag = get_bits1(&gb);
     981           0 :     if (sl->use_au_end)
     982           0 :         au_end_flag = get_bits1(&gb);
     983           0 :     if (!sl->use_au_start && !sl->use_au_end)
     984           0 :         au_start_flag = au_end_flag = 1;
     985           0 :     if (sl->ocr_len > 0)
     986           0 :         ocr_flag = get_bits1(&gb);
     987           0 :     if (sl->use_idle)
     988           0 :         idle_flag = get_bits1(&gb);
     989           0 :     if (sl->use_padding)
     990           0 :         padding_flag = get_bits1(&gb);
     991           0 :     if (padding_flag)
     992           0 :         padding_bits = get_bits(&gb, 3);
     993             : 
     994           0 :     if (!idle_flag && (!padding_flag || padding_bits != 0)) {
     995           0 :         if (sl->packet_seq_num_len)
     996           0 :             skip_bits_long(&gb, sl->packet_seq_num_len);
     997           0 :         if (sl->degr_prior_len)
     998           0 :             if (get_bits1(&gb))
     999           0 :                 skip_bits(&gb, sl->degr_prior_len);
    1000           0 :         if (ocr_flag)
    1001           0 :             skip_bits_long(&gb, sl->ocr_len);
    1002           0 :         if (au_start_flag) {
    1003           0 :             if (sl->use_rand_acc_pt)
    1004           0 :                 get_bits1(&gb);
    1005           0 :             if (sl->au_seq_num_len > 0)
    1006           0 :                 skip_bits_long(&gb, sl->au_seq_num_len);
    1007           0 :             if (sl->use_timestamps) {
    1008           0 :                 dts_flag = get_bits1(&gb);
    1009           0 :                 cts_flag = get_bits1(&gb);
    1010             :             }
    1011             :         }
    1012           0 :         if (sl->inst_bitrate_len)
    1013           0 :             inst_bitrate_flag = get_bits1(&gb);
    1014           0 :         if (dts_flag == 1)
    1015           0 :             dts = get_ts64(&gb, sl->timestamp_len);
    1016           0 :         if (cts_flag == 1)
    1017           0 :             cts = get_ts64(&gb, sl->timestamp_len);
    1018           0 :         if (sl->au_len > 0)
    1019           0 :             skip_bits_long(&gb, sl->au_len);
    1020           0 :         if (inst_bitrate_flag)
    1021           0 :             skip_bits_long(&gb, sl->inst_bitrate_len);
    1022             :     }
    1023             : 
    1024           0 :     if (dts != AV_NOPTS_VALUE)
    1025           0 :         pes->dts = dts;
    1026           0 :     if (cts != AV_NOPTS_VALUE)
    1027           0 :         pes->pts = cts;
    1028             : 
    1029           0 :     if (sl->timestamp_len && sl->timestamp_res)
    1030           0 :         avpriv_set_pts_info(pes->st, sl->timestamp_len, 1, sl->timestamp_res);
    1031             : 
    1032           0 :     return (get_bits_count(&gb) + 7) >> 3;
    1033             : }
    1034             : 
    1035             : /* return non zero if a packet could be constructed */
    1036      257134 : static int mpegts_push_data(MpegTSFilter *filter,
    1037             :                             const uint8_t *buf, int buf_size, int is_start,
    1038             :                             int64_t pos)
    1039             : {
    1040      257134 :     PESContext *pes   = filter->u.pes_filter.opaque;
    1041      257134 :     MpegTSContext *ts = pes->ts;
    1042             :     const uint8_t *p;
    1043             :     int ret, len, code;
    1044             : 
    1045      257134 :     if (!ts->pkt)
    1046           0 :         return 0;
    1047             : 
    1048      257134 :     if (is_start) {
    1049       20455 :         if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
    1050        1847 :             ret = new_pes_packet(pes, ts->pkt);
    1051        1847 :             if (ret < 0)
    1052           0 :                 return ret;
    1053        1847 :             ts->stop_parse = 1;
    1054             :         } else {
    1055       18608 :             reset_pes_packet_state(pes);
    1056             :         }
    1057       20455 :         pes->state         = MPEGTS_HEADER;
    1058       20455 :         pes->ts_packet_pos = pos;
    1059             :     }
    1060      257134 :     p = buf;
    1061      831654 :     while (buf_size > 0) {
    1062      317386 :         switch (pes->state) {
    1063       20455 :         case MPEGTS_HEADER:
    1064       20455 :             len = PES_START_SIZE - pes->data_index;
    1065       20455 :             if (len > buf_size)
    1066           1 :                 len = buf_size;
    1067       20455 :             memcpy(pes->header + pes->data_index, p, len);
    1068       20455 :             pes->data_index += len;
    1069       20455 :             p += len;
    1070       20455 :             buf_size -= len;
    1071       20455 :             if (pes->data_index == PES_START_SIZE) {
    1072             :                 /* we got all the PES or section header. We can now
    1073             :                  * decide */
    1074       40896 :                 if (pes->header[0] == 0x00 && pes->header[1] == 0x00 &&
    1075       20442 :                     pes->header[2] == 0x01) {
    1076             :                     /* it must be an MPEG-2 PES stream */
    1077       20442 :                     code = pes->header[3] | 0x100;
    1078       20442 :                     av_log(pes->stream, AV_LOG_TRACE, "pid=%x pes_code=%#x\n", pes->pid,
    1079             :                             code);
    1080       20442 :                     pes->stream_id = pes->header[3];
    1081             : 
    1082       20985 :                     if ((pes->st && pes->st->discard == AVDISCARD_ALL &&
    1083         543 :                          (!pes->sub_st ||
    1084       19899 :                           pes->sub_st->discard == AVDISCARD_ALL)) ||
    1085             :                         code == 0x1be) /* padding_stream */
    1086             :                         goto skip;
    1087             : 
    1088             :                     /* stream not present in PMT */
    1089       19899 :                     if (!pes->st) {
    1090           0 :                         if (ts->skip_changes)
    1091           0 :                             goto skip;
    1092           0 :                         if (ts->merge_pmt_versions)
    1093           0 :                             goto skip; /* wait for PMT to merge new stream */
    1094             : 
    1095           0 :                         pes->st = avformat_new_stream(ts->stream, NULL);
    1096           0 :                         if (!pes->st)
    1097           0 :                             return AVERROR(ENOMEM);
    1098           0 :                         pes->st->id = pes->pid;
    1099           0 :                         mpegts_set_stream_info(pes->st, pes, 0, 0);
    1100             :                     }
    1101             : 
    1102       19899 :                     pes->total_size = AV_RB16(pes->header + 4);
    1103             :                     /* NOTE: a zero total size means the PES size is
    1104             :                      * unbounded */
    1105       19899 :                     if (!pes->total_size)
    1106        1972 :                         pes->total_size = MAX_PES_PAYLOAD;
    1107             : 
    1108             :                     /* allocate pes buffer */
    1109       19899 :                     pes->buffer = av_buffer_alloc(pes->total_size +
    1110             :                                                   AV_INPUT_BUFFER_PADDING_SIZE);
    1111       19899 :                     if (!pes->buffer)
    1112           0 :                         return AVERROR(ENOMEM);
    1113             : 
    1114       39798 :                     if (code != 0x1bc && code != 0x1bf && /* program_stream_map, private_stream_2 */
    1115       19899 :                         code != 0x1f0 && code != 0x1f1 && /* ECM, EMM */
    1116       19899 :                         code != 0x1ff && code != 0x1f2 && /* program_stream_directory, DSMCC_stream */
    1117             :                         code != 0x1f8) {                  /* ITU-T Rec. H.222.1 type E stream */
    1118       19899 :                         pes->state = MPEGTS_PESHEADER;
    1119       39798 :                         if (pes->st->codecpar->codec_id == AV_CODEC_ID_NONE && !pes->st->request_probe) {
    1120           2 :                             av_log(pes->stream, AV_LOG_TRACE,
    1121             :                                     "pid=%x stream_type=%x probing\n",
    1122             :                                     pes->pid,
    1123             :                                     pes->stream_type);
    1124           2 :                             pes->st->request_probe = 1;
    1125             :                         }
    1126             :                     } else {
    1127           0 :                         pes->pes_header_size = 6;
    1128           0 :                         pes->state      = MPEGTS_PAYLOAD;
    1129           0 :                         pes->data_index = 0;
    1130             :                     }
    1131             :                 } else {
    1132             :                     /* otherwise, it should be a table */
    1133             :                     /* skip packet */
    1134         555 : skip:
    1135         555 :                     pes->state = MPEGTS_SKIP;
    1136         555 :                     continue;
    1137             :                 }
    1138             :             }
    1139       19900 :             break;
    1140             :         /**********************************************/
    1141             :         /* PES packing parsing */
    1142       19899 :         case MPEGTS_PESHEADER:
    1143       19899 :             len = PES_HEADER_SIZE - pes->data_index;
    1144       19899 :             if (len < 0)
    1145           0 :                 return AVERROR_INVALIDDATA;
    1146       19899 :             if (len > buf_size)
    1147           0 :                 len = buf_size;
    1148       19899 :             memcpy(pes->header + pes->data_index, p, len);
    1149       19899 :             pes->data_index += len;
    1150       19899 :             p += len;
    1151       19899 :             buf_size -= len;
    1152       19899 :             if (pes->data_index == PES_HEADER_SIZE) {
    1153       19899 :                 pes->pes_header_size = pes->header[8] + 9;
    1154       19899 :                 pes->state           = MPEGTS_PESHEADER_FILL;
    1155             :             }
    1156       19899 :             break;
    1157       19899 :         case MPEGTS_PESHEADER_FILL:
    1158       19899 :             len = pes->pes_header_size - pes->data_index;
    1159       19899 :             if (len < 0)
    1160           0 :                 return AVERROR_INVALIDDATA;
    1161       19899 :             if (len > buf_size)
    1162           0 :                 len = buf_size;
    1163       19899 :             memcpy(pes->header + pes->data_index, p, len);
    1164       19899 :             pes->data_index += len;
    1165       19899 :             p += len;
    1166       19899 :             buf_size -= len;
    1167       19899 :             if (pes->data_index == pes->pes_header_size) {
    1168             :                 const uint8_t *r;
    1169             :                 unsigned int flags, pes_ext, skip;
    1170             : 
    1171       19899 :                 flags = pes->header[7];
    1172       19899 :                 r = pes->header + 9;
    1173       19899 :                 pes->pts = AV_NOPTS_VALUE;
    1174       19899 :                 pes->dts = AV_NOPTS_VALUE;
    1175       19899 :                 if ((flags & 0xc0) == 0x80) {
    1176        6164 :                     pes->dts = pes->pts = ff_parse_pes_pts(r);
    1177        6164 :                     r += 5;
    1178       13735 :                 } else if ((flags & 0xc0) == 0xc0) {
    1179        1373 :                     pes->pts = ff_parse_pes_pts(r);
    1180        1373 :                     r += 5;
    1181        1373 :                     pes->dts = ff_parse_pes_pts(r);
    1182        1373 :                     r += 5;
    1183             :                 }
    1184       19899 :                 pes->extended_stream_id = -1;
    1185       19899 :                 if (flags & 0x01) { /* PES extension */
    1186           0 :                     pes_ext = *r++;
    1187             :                     /* Skip PES private data, program packet sequence counter and P-STD buffer */
    1188           0 :                     skip  = (pes_ext >> 4) & 0xb;
    1189           0 :                     skip += skip & 0x9;
    1190           0 :                     r    += skip;
    1191           0 :                     if ((pes_ext & 0x41) == 0x01 &&
    1192           0 :                         (r + 2) <= (pes->header + pes->pes_header_size)) {
    1193             :                         /* PES extension 2 */
    1194           0 :                         if ((r[0] & 0x7f) > 0 && (r[1] & 0x80) == 0)
    1195           0 :                             pes->extended_stream_id = r[1];
    1196             :                     }
    1197             :                 }
    1198             : 
    1199             :                 /* we got the full header. We parse it and get the payload */
    1200       19899 :                 pes->state = MPEGTS_PAYLOAD;
    1201       19899 :                 pes->data_index = 0;
    1202       19899 :                 if (pes->stream_type == 0x12 && buf_size > 0) {
    1203           0 :                     int sl_header_bytes = read_sl_header(pes, &pes->sl, p,
    1204             :                                                          buf_size);
    1205           0 :                     pes->pes_header_size += sl_header_bytes;
    1206           0 :                     p += sl_header_bytes;
    1207           0 :                     buf_size -= sl_header_bytes;
    1208             :                 }
    1209       19899 :                 if (pes->stream_type == 0x15 && buf_size >= 5) {
    1210             :                     /* skip metadata access unit header */
    1211           0 :                     pes->pes_header_size += 5;
    1212           0 :                     p += 5;
    1213           0 :                     buf_size -= 5;
    1214             :                 }
    1215       19899 :                 if (   pes->ts->fix_teletext_pts
    1216       19899 :                     && (   pes->st->codecpar->codec_id == AV_CODEC_ID_DVB_TELETEXT
    1217       19899 :                         || pes->st->codecpar->codec_id == AV_CODEC_ID_DVB_SUBTITLE)
    1218             :                     ) {
    1219           0 :                     AVProgram *p = NULL;
    1220           0 :                     while ((p = av_find_program_from_stream(pes->stream, p, pes->st->index))) {
    1221           0 :                         if (p->pcr_pid != -1 && p->discard != AVDISCARD_ALL) {
    1222           0 :                             MpegTSFilter *f = pes->ts->pids[p->pcr_pid];
    1223           0 :                             if (f) {
    1224           0 :                                 AVStream *st = NULL;
    1225           0 :                                 if (f->type == MPEGTS_PES) {
    1226           0 :                                     PESContext *pcrpes = f->u.pes_filter.opaque;
    1227           0 :                                     if (pcrpes)
    1228           0 :                                         st = pcrpes->st;
    1229           0 :                                 } else if (f->type == MPEGTS_PCR) {
    1230             :                                     int i;
    1231           0 :                                     for (i = 0; i < p->nb_stream_indexes; i++) {
    1232           0 :                                         AVStream *pst = pes->stream->streams[p->stream_index[i]];
    1233           0 :                                         if (pst->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
    1234           0 :                                             st = pst;
    1235             :                                     }
    1236             :                                 }
    1237           0 :                                 if (f->last_pcr != -1 && st && st->discard != AVDISCARD_ALL) {
    1238             :                                     // teletext packets do not always have correct timestamps,
    1239             :                                     // the standard says they should be handled after 40.6 ms at most,
    1240             :                                     // and the pcr error to this packet should be no more than 100 ms.
    1241             :                                     // TODO: we should interpolate the PCR, not just use the last one
    1242           0 :                                     int64_t pcr = f->last_pcr / 300;
    1243           0 :                                     pes->st->pts_wrap_reference = st->pts_wrap_reference;
    1244           0 :                                     pes->st->pts_wrap_behavior = st->pts_wrap_behavior;
    1245           0 :                                     if (pes->dts == AV_NOPTS_VALUE || pes->dts < pcr) {
    1246           0 :                                         pes->pts = pes->dts = pcr;
    1247           0 :                                     } else if (pes->st->codecpar->codec_id == AV_CODEC_ID_DVB_TELETEXT &&
    1248           0 :                                                pes->dts > pcr + 3654 + 9000) {
    1249           0 :                                         pes->pts = pes->dts = pcr + 3654 + 9000;
    1250           0 :                                     } else if (pes->st->codecpar->codec_id == AV_CODEC_ID_DVB_SUBTITLE &&
    1251           0 :                                                pes->dts > pcr + 10*90000) { //10sec
    1252           0 :                                         pes->pts = pes->dts = pcr + 3654 + 9000;
    1253             :                                     }
    1254           0 :                                     break;
    1255             :                                 }
    1256             :                             }
    1257             :                         }
    1258             :                     }
    1259             :                 }
    1260             :             }
    1261       19899 :             break;
    1262      250095 :         case MPEGTS_PAYLOAD:
    1263      250095 :             if (pes->buffer) {
    1264      480291 :                 if (pes->data_index > 0 &&
    1265      230196 :                     pes->data_index + buf_size > pes->total_size) {
    1266           0 :                     ret = new_pes_packet(pes, ts->pkt);
    1267           0 :                     if (ret < 0)
    1268           0 :                         return ret;
    1269           0 :                     pes->total_size = MAX_PES_PAYLOAD;
    1270           0 :                     pes->buffer = av_buffer_alloc(pes->total_size +
    1271             :                                                   AV_INPUT_BUFFER_PADDING_SIZE);
    1272           0 :                     if (!pes->buffer)
    1273           0 :                         return AVERROR(ENOMEM);
    1274           0 :                     ts->stop_parse = 1;
    1275      269994 :                 } else if (pes->data_index == 0 &&
    1276       19899 :                            buf_size > pes->total_size) {
    1277             :                     // pes packet size is < ts size packet and pes data is padded with 0xff
    1278             :                     // not sure if this is legal in ts but see issue #2392
    1279           0 :                     buf_size = pes->total_size;
    1280             :                 }
    1281      250095 :                 memcpy(pes->buffer->data + pes->data_index, p, buf_size);
    1282      250095 :                 pes->data_index += buf_size;
    1283             :                 /* emit complete packets with known packet size
    1284             :                  * decreases demuxer delay for infrequent packets like subtitles from
    1285             :                  * a couple of seconds to milliseconds for properly muxed files.
    1286             :                  * total_size is the number of bytes following pes_packet_length
    1287             :                  * in the pes header, i.e. not counting the first PES_START_SIZE bytes */
    1288      382106 :                 if (!ts->stop_parse && pes->total_size < MAX_PES_PAYLOAD &&
    1289      132011 :                     pes->pes_header_size + pes->data_index == pes->total_size + PES_START_SIZE) {
    1290       17877 :                     ts->stop_parse = 1;
    1291       17877 :                     ret = new_pes_packet(pes, ts->pkt);
    1292       17877 :                     if (ret < 0)
    1293           0 :                         return ret;
    1294             :                 }
    1295             :             }
    1296      250095 :             buf_size = 0;
    1297      250095 :             break;
    1298        7038 :         case MPEGTS_SKIP:
    1299        7038 :             buf_size = 0;
    1300        7038 :             break;
    1301             :         }
    1302             :     }
    1303             : 
    1304      257134 :     return 0;
    1305             : }
    1306             : 
    1307          71 : static PESContext *add_pes_stream(MpegTSContext *ts, int pid, int pcr_pid)
    1308             : {
    1309             :     MpegTSFilter *tss;
    1310             :     PESContext *pes;
    1311             : 
    1312             :     /* if no pid found, then add a pid context */
    1313          71 :     pes = av_mallocz(sizeof(PESContext));
    1314          71 :     if (!pes)
    1315           0 :         return 0;
    1316          71 :     pes->ts      = ts;
    1317          71 :     pes->stream  = ts->stream;
    1318          71 :     pes->pid     = pid;
    1319          71 :     pes->pcr_pid = pcr_pid;
    1320          71 :     pes->state   = MPEGTS_SKIP;
    1321          71 :     pes->pts     = AV_NOPTS_VALUE;
    1322          71 :     pes->dts     = AV_NOPTS_VALUE;
    1323          71 :     tss          = mpegts_open_pes_filter(ts, pid, mpegts_push_data, pes);
    1324          71 :     if (!tss) {
    1325           0 :         av_free(pes);
    1326           0 :         return 0;
    1327             :     }
    1328          71 :     return pes;
    1329             : }
    1330             : 
    1331             : #define MAX_LEVEL 4
    1332             : typedef struct MP4DescrParseContext {
    1333             :     AVFormatContext *s;
    1334             :     AVIOContext pb;
    1335             :     Mp4Descr *descr;
    1336             :     Mp4Descr *active_descr;
    1337             :     int descr_count;
    1338             :     int max_descr_count;
    1339             :     int level;
    1340             :     int predefined_SLConfigDescriptor_seen;
    1341             : } MP4DescrParseContext;
    1342             : 
    1343           0 : static int init_MP4DescrParseContext(MP4DescrParseContext *d, AVFormatContext *s,
    1344             :                                      const uint8_t *buf, unsigned size,
    1345             :                                      Mp4Descr *descr, int max_descr_count)
    1346             : {
    1347             :     int ret;
    1348           0 :     if (size > (1 << 30))
    1349           0 :         return AVERROR_INVALIDDATA;
    1350             : 
    1351           0 :     if ((ret = ffio_init_context(&d->pb, (unsigned char *)buf, size, 0,
    1352             :                                  NULL, NULL, NULL, NULL)) < 0)
    1353           0 :         return ret;
    1354             : 
    1355           0 :     d->s               = s;
    1356           0 :     d->level           = 0;
    1357           0 :     d->descr_count     = 0;
    1358           0 :     d->descr           = descr;
    1359           0 :     d->active_descr    = NULL;
    1360           0 :     d->max_descr_count = max_descr_count;
    1361             : 
    1362           0 :     return 0;
    1363             : }
    1364             : 
    1365           0 : static void update_offsets(AVIOContext *pb, int64_t *off, int *len)
    1366             : {
    1367           0 :     int64_t new_off = avio_tell(pb);
    1368           0 :     (*len) -= new_off - *off;
    1369           0 :     *off    = new_off;
    1370           0 : }
    1371             : 
    1372             : static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
    1373             :                            int target_tag);
    1374             : 
    1375           0 : static int parse_mp4_descr_arr(MP4DescrParseContext *d, int64_t off, int len)
    1376             : {
    1377           0 :     while (len > 0) {
    1378           0 :         int ret = parse_mp4_descr(d, off, len, 0);
    1379           0 :         if (ret < 0)
    1380           0 :             return ret;
    1381           0 :         update_offsets(&d->pb, &off, &len);
    1382             :     }
    1383           0 :     return 0;
    1384             : }
    1385             : 
    1386           0 : static int parse_MP4IODescrTag(MP4DescrParseContext *d, int64_t off, int len)
    1387             : {
    1388           0 :     avio_rb16(&d->pb); // ID
    1389           0 :     avio_r8(&d->pb);
    1390           0 :     avio_r8(&d->pb);
    1391           0 :     avio_r8(&d->pb);
    1392           0 :     avio_r8(&d->pb);
    1393           0 :     avio_r8(&d->pb);
    1394           0 :     update_offsets(&d->pb, &off, &len);
    1395           0 :     return parse_mp4_descr_arr(d, off, len);
    1396             : }
    1397             : 
    1398           0 : static int parse_MP4ODescrTag(MP4DescrParseContext *d, int64_t off, int len)
    1399             : {
    1400             :     int id_flags;
    1401           0 :     if (len < 2)
    1402           0 :         return 0;
    1403           0 :     id_flags = avio_rb16(&d->pb);
    1404           0 :     if (!(id_flags & 0x0020)) { // URL_Flag
    1405           0 :         update_offsets(&d->pb, &off, &len);
    1406           0 :         return parse_mp4_descr_arr(d, off, len); // ES_Descriptor[]
    1407             :     } else {
    1408           0 :         return 0;
    1409             :     }
    1410             : }
    1411             : 
    1412           0 : static int parse_MP4ESDescrTag(MP4DescrParseContext *d, int64_t off, int len)
    1413             : {
    1414           0 :     int es_id = 0;
    1415           0 :     int ret   = 0;
    1416             : 
    1417           0 :     if (d->descr_count >= d->max_descr_count)
    1418           0 :         return AVERROR_INVALIDDATA;
    1419           0 :     ff_mp4_parse_es_descr(&d->pb, &es_id);
    1420           0 :     d->active_descr = d->descr + (d->descr_count++);
    1421             : 
    1422           0 :     d->active_descr->es_id = es_id;
    1423           0 :     update_offsets(&d->pb, &off, &len);
    1424           0 :     if ((ret = parse_mp4_descr(d, off, len, MP4DecConfigDescrTag)) < 0)
    1425           0 :         return ret;
    1426           0 :     update_offsets(&d->pb, &off, &len);
    1427           0 :     if (len > 0)
    1428           0 :         ret = parse_mp4_descr(d, off, len, MP4SLDescrTag);
    1429           0 :     d->active_descr = NULL;
    1430           0 :     return ret;
    1431             : }
    1432             : 
    1433           0 : static int parse_MP4DecConfigDescrTag(MP4DescrParseContext *d, int64_t off,
    1434             :                                       int len)
    1435             : {
    1436           0 :     Mp4Descr *descr = d->active_descr;
    1437           0 :     if (!descr)
    1438           0 :         return AVERROR_INVALIDDATA;
    1439           0 :     d->active_descr->dec_config_descr = av_malloc(len);
    1440           0 :     if (!descr->dec_config_descr)
    1441           0 :         return AVERROR(ENOMEM);
    1442           0 :     descr->dec_config_descr_len = len;
    1443           0 :     avio_read(&d->pb, descr->dec_config_descr, len);
    1444           0 :     return 0;
    1445             : }
    1446             : 
    1447           0 : static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
    1448             : {
    1449           0 :     Mp4Descr *descr = d->active_descr;
    1450             :     int predefined;
    1451           0 :     if (!descr)
    1452           0 :         return AVERROR_INVALIDDATA;
    1453             : 
    1454             : #define R8_CHECK_CLIP_MAX(dst, maxv) do {                       \
    1455             :     descr->sl.dst = avio_r8(&d->pb);                            \
    1456             :     if (descr->sl.dst > maxv) {                                 \
    1457             :         descr->sl.dst = maxv;                                   \
    1458             :         return AVERROR_INVALIDDATA;                             \
    1459             :     }                                                           \
    1460             : } while (0)
    1461             : 
    1462           0 :     predefined = avio_r8(&d->pb);
    1463           0 :     if (!predefined) {
    1464             :         int lengths;
    1465           0 :         int flags = avio_r8(&d->pb);
    1466           0 :         descr->sl.use_au_start    = !!(flags & 0x80);
    1467           0 :         descr->sl.use_au_end      = !!(flags & 0x40);
    1468           0 :         descr->sl.use_rand_acc_pt = !!(flags & 0x20);
    1469           0 :         descr->sl.use_padding     = !!(flags & 0x08);
    1470           0 :         descr->sl.use_timestamps  = !!(flags & 0x04);
    1471           0 :         descr->sl.use_idle        = !!(flags & 0x02);
    1472           0 :         descr->sl.timestamp_res   = avio_rb32(&d->pb);
    1473           0 :         avio_rb32(&d->pb);
    1474           0 :         R8_CHECK_CLIP_MAX(timestamp_len, 63);
    1475           0 :         R8_CHECK_CLIP_MAX(ocr_len,       63);
    1476           0 :         R8_CHECK_CLIP_MAX(au_len,        31);
    1477           0 :         descr->sl.inst_bitrate_len   = avio_r8(&d->pb);
    1478           0 :         lengths                      = avio_rb16(&d->pb);
    1479           0 :         descr->sl.degr_prior_len     = lengths >> 12;
    1480           0 :         descr->sl.au_seq_num_len     = (lengths >> 7) & 0x1f;
    1481           0 :         descr->sl.packet_seq_num_len = (lengths >> 2) & 0x1f;
    1482           0 :     } else if (!d->predefined_SLConfigDescriptor_seen){
    1483           0 :         avpriv_report_missing_feature(d->s, "Predefined SLConfigDescriptor");
    1484           0 :         d->predefined_SLConfigDescriptor_seen = 1;
    1485             :     }
    1486           0 :     return 0;
    1487             : }
    1488             : 
    1489           0 : static int parse_mp4_descr(MP4DescrParseContext *d, int64_t off, int len,
    1490             :                            int target_tag)
    1491             : {
    1492             :     int tag;
    1493           0 :     int len1 = ff_mp4_read_descr(d->s, &d->pb, &tag);
    1494           0 :     int ret = 0;
    1495             : 
    1496           0 :     update_offsets(&d->pb, &off, &len);
    1497           0 :     if (len < 0 || len1 > len || len1 <= 0) {
    1498           0 :         av_log(d->s, AV_LOG_ERROR,
    1499             :                "Tag %x length violation new length %d bytes remaining %d\n",
    1500             :                tag, len1, len);
    1501           0 :         return AVERROR_INVALIDDATA;
    1502             :     }
    1503             : 
    1504           0 :     if (d->level++ >= MAX_LEVEL) {
    1505           0 :         av_log(d->s, AV_LOG_ERROR, "Maximum MP4 descriptor level exceeded\n");
    1506           0 :         ret = AVERROR_INVALIDDATA;
    1507           0 :         goto done;
    1508             :     }
    1509             : 
    1510           0 :     if (target_tag && tag != target_tag) {
    1511           0 :         av_log(d->s, AV_LOG_ERROR, "Found tag %x expected %x\n", tag,
    1512             :                target_tag);
    1513           0 :         ret = AVERROR_INVALIDDATA;
    1514           0 :         goto done;
    1515             :     }
    1516             : 
    1517           0 :     switch (tag) {
    1518           0 :     case MP4IODescrTag:
    1519           0 :         ret = parse_MP4IODescrTag(d, off, len1);
    1520           0 :         break;
    1521           0 :     case MP4ODescrTag:
    1522           0 :         ret = parse_MP4ODescrTag(d, off, len1);
    1523           0 :         break;
    1524           0 :     case MP4ESDescrTag:
    1525           0 :         ret = parse_MP4ESDescrTag(d, off, len1);
    1526           0 :         break;
    1527           0 :     case MP4DecConfigDescrTag:
    1528           0 :         ret = parse_MP4DecConfigDescrTag(d, off, len1);
    1529           0 :         break;
    1530           0 :     case MP4SLDescrTag:
    1531           0 :         ret = parse_MP4SLDescrTag(d, off, len1);
    1532           0 :         break;
    1533             :     }
    1534             : 
    1535             : 
    1536           0 : done:
    1537           0 :     d->level--;
    1538           0 :     avio_seek(&d->pb, off + len1, SEEK_SET);
    1539           0 :     return ret;
    1540             : }
    1541             : 
    1542           0 : static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
    1543             :                          Mp4Descr *descr, int *descr_count, int max_descr_count)
    1544             : {
    1545             :     MP4DescrParseContext d;
    1546             :     int ret;
    1547             : 
    1548           0 :     ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
    1549           0 :     if (ret < 0)
    1550           0 :         return ret;
    1551             : 
    1552           0 :     ret = parse_mp4_descr(&d, avio_tell(&d.pb), size, MP4IODescrTag);
    1553             : 
    1554           0 :     *descr_count = d.descr_count;
    1555           0 :     return ret;
    1556             : }
    1557             : 
    1558           0 : static int mp4_read_od(AVFormatContext *s, const uint8_t *buf, unsigned size,
    1559             :                        Mp4Descr *descr, int *descr_count, int max_descr_count)
    1560             : {
    1561             :     MP4DescrParseContext d;
    1562             :     int ret;
    1563             : 
    1564           0 :     ret = init_MP4DescrParseContext(&d, s, buf, size, descr, max_descr_count);
    1565           0 :     if (ret < 0)
    1566           0 :         return ret;
    1567             : 
    1568           0 :     ret = parse_mp4_descr_arr(&d, avio_tell(&d.pb), size);
    1569             : 
    1570           0 :     *descr_count = d.descr_count;
    1571           0 :     return ret;
    1572             : }
    1573             : 
    1574           0 : static void m4sl_cb(MpegTSFilter *filter, const uint8_t *section,
    1575             :                     int section_len)
    1576             : {
    1577           0 :     MpegTSContext *ts = filter->u.section_filter.opaque;
    1578           0 :     MpegTSSectionFilter *tssf = &filter->u.section_filter;
    1579             :     SectionHeader h;
    1580             :     const uint8_t *p, *p_end;
    1581             :     AVIOContext pb;
    1582           0 :     int mp4_descr_count = 0;
    1583           0 :     Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
    1584             :     int i, pid;
    1585           0 :     AVFormatContext *s = ts->stream;
    1586             : 
    1587           0 :     p_end = section + section_len - 4;
    1588           0 :     p = section;
    1589           0 :     if (parse_section_header(&h, &p, p_end) < 0)
    1590           0 :         return;
    1591           0 :     if (h.tid != M4OD_TID)
    1592           0 :         return;
    1593           0 :     if (skip_identical(&h, tssf))
    1594           0 :         return;
    1595             : 
    1596           0 :     mp4_read_od(s, p, (unsigned) (p_end - p), mp4_descr, &mp4_descr_count,
    1597             :                 MAX_MP4_DESCR_COUNT);
    1598             : 
    1599           0 :     for (pid = 0; pid < NB_PID_MAX; pid++) {
    1600           0 :         if (!ts->pids[pid])
    1601           0 :             continue;
    1602           0 :         for (i = 0; i < mp4_descr_count; i++) {
    1603             :             PESContext *pes;
    1604             :             AVStream *st;
    1605           0 :             if (ts->pids[pid]->es_id != mp4_descr[i].es_id)
    1606           0 :                 continue;
    1607           0 :             if (ts->pids[pid]->type != MPEGTS_PES) {
    1608           0 :                 av_log(s, AV_LOG_ERROR, "pid %x is not PES\n", pid);
    1609           0 :                 continue;
    1610             :             }
    1611           0 :             pes = ts->pids[pid]->u.pes_filter.opaque;
    1612           0 :             st  = pes->st;
    1613           0 :             if (!st)
    1614           0 :                 continue;
    1615             : 
    1616           0 :             pes->sl = mp4_descr[i].sl;
    1617             : 
    1618           0 :             ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
    1619             :                               mp4_descr[i].dec_config_descr_len, 0,
    1620             :                               NULL, NULL, NULL, NULL);
    1621           0 :             ff_mp4_read_dec_config_descr(s, st, &pb);
    1622           0 :             if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
    1623           0 :                 st->codecpar->extradata_size > 0)
    1624           0 :                 st->need_parsing = 0;
    1625           0 :             if (st->codecpar->codec_id == AV_CODEC_ID_H264 &&
    1626           0 :                 st->codecpar->extradata_size > 0)
    1627           0 :                 st->need_parsing = 0;
    1628             : 
    1629           0 :             st->codecpar->codec_type = avcodec_get_type(st->codecpar->codec_id);
    1630           0 :             st->internal->need_context_update = 1;
    1631             :         }
    1632             :     }
    1633           0 :     for (i = 0; i < mp4_descr_count; i++)
    1634           0 :         av_free(mp4_descr[i].dec_config_descr);
    1635             : }
    1636             : 
    1637           0 : static void scte_data_cb(MpegTSFilter *filter, const uint8_t *section,
    1638             :                     int section_len)
    1639             : {
    1640           0 :     AVProgram *prg = NULL;
    1641           0 :     MpegTSContext *ts = filter->u.section_filter.opaque;
    1642             : 
    1643           0 :     int idx = ff_find_stream_index(ts->stream, filter->pid);
    1644           0 :     if (idx < 0)
    1645           0 :         return;
    1646             : 
    1647           0 :     new_data_packet(section, section_len, ts->pkt);
    1648           0 :     ts->pkt->stream_index = idx;
    1649           0 :     prg = av_find_program_from_stream(ts->stream, NULL, idx);
    1650           0 :     if (prg && prg->pcr_pid != -1 && prg->discard != AVDISCARD_ALL) {
    1651           0 :         MpegTSFilter *f = ts->pids[prg->pcr_pid];
    1652           0 :         if (f && f->last_pcr != -1)
    1653           0 :             ts->pkt->pts = ts->pkt->dts = f->last_pcr/300;
    1654             :     }
    1655           0 :     ts->stop_parse = 1;
    1656             : 
    1657             : }
    1658             : 
    1659             : static const uint8_t opus_coupled_stream_cnt[9] = {
    1660             :     1, 0, 1, 1, 2, 2, 2, 3, 3
    1661             : };
    1662             : 
    1663             : static const uint8_t opus_stream_cnt[9] = {
    1664             :     1, 1, 1, 2, 2, 3, 4, 4, 5,
    1665             : };
    1666             : 
    1667             : static const uint8_t opus_channel_map[8][8] = {
    1668             :     { 0 },
    1669             :     { 0,1 },
    1670             :     { 0,2,1 },
    1671             :     { 0,1,2,3 },
    1672             :     { 0,4,1,2,3 },
    1673             :     { 0,4,1,2,3,5 },
    1674             :     { 0,4,1,2,3,5,6 },
    1675             :     { 0,6,1,2,3,4,5,7 },
    1676             : };
    1677             : 
    1678         547 : int ff_parse_mpeg2_descriptor(AVFormatContext *fc, AVStream *st, int stream_type,
    1679             :                               const uint8_t **pp, const uint8_t *desc_list_end,
    1680             :                               Mp4Descr *mp4_descr, int mp4_descr_count, int pid,
    1681             :                               MpegTSContext *ts)
    1682             : {
    1683             :     const uint8_t *desc_end;
    1684             :     int desc_len, desc_tag, desc_es_id, ext_desc_tag, channels, channel_config_code;
    1685             :     char language[252];
    1686             :     int i;
    1687             : 
    1688         547 :     desc_tag = get8(pp, desc_list_end);
    1689         547 :     if (desc_tag < 0)
    1690         393 :         return AVERROR_INVALIDDATA;
    1691         154 :     desc_len = get8(pp, desc_list_end);
    1692         154 :     if (desc_len < 0)
    1693           0 :         return AVERROR_INVALIDDATA;
    1694         154 :     desc_end = *pp + desc_len;
    1695         154 :     if (desc_end > desc_list_end)
    1696           0 :         return AVERROR_INVALIDDATA;
    1697             : 
    1698         154 :     av_log(fc, AV_LOG_TRACE, "tag: 0x%02x len=%d\n", desc_tag, desc_len);
    1699             : 
    1700         154 :     if ((st->codecpar->codec_id == AV_CODEC_ID_NONE || st->request_probe > 0) &&
    1701             :         stream_type == STREAM_TYPE_PRIVATE_DATA)
    1702           6 :         mpegts_find_stream_type(st, desc_tag, DESC_types);
    1703             : 
    1704         154 :     switch (desc_tag) {
    1705           0 :     case 0x02: /* video stream descriptor */
    1706           0 :         if (get8(pp, desc_end) & 0x1) {
    1707           0 :             st->disposition |= AV_DISPOSITION_STILL_IMAGE;
    1708             :         }
    1709           0 :         break;
    1710           0 :     case 0x1E: /* SL descriptor */
    1711           0 :         desc_es_id = get16(pp, desc_end);
    1712           0 :         if (desc_es_id < 0)
    1713           0 :             break;
    1714           0 :         if (ts && ts->pids[pid])
    1715           0 :             ts->pids[pid]->es_id = desc_es_id;
    1716           0 :         for (i = 0; i < mp4_descr_count; i++)
    1717           0 :             if (mp4_descr[i].dec_config_descr_len &&
    1718           0 :                 mp4_descr[i].es_id == desc_es_id) {
    1719             :                 AVIOContext pb;
    1720           0 :                 ffio_init_context(&pb, mp4_descr[i].dec_config_descr,
    1721           0 :                                   mp4_descr[i].dec_config_descr_len, 0,
    1722             :                                   NULL, NULL, NULL, NULL);
    1723           0 :                 ff_mp4_read_dec_config_descr(fc, st, &pb);
    1724           0 :                 if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
    1725           0 :                     st->codecpar->extradata_size > 0) {
    1726           0 :                     st->need_parsing = 0;
    1727           0 :                     st->internal->need_context_update = 1;
    1728             :                 }
    1729           0 :                 if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4SYSTEMS)
    1730           0 :                     mpegts_open_section_filter(ts, pid, m4sl_cb, ts, 1);
    1731             :             }
    1732           0 :         break;
    1733           0 :     case 0x1F: /* FMC descriptor */
    1734           0 :         if (get16(pp, desc_end) < 0)
    1735           0 :             break;
    1736           0 :         if (mp4_descr_count > 0 &&
    1737           0 :             (st->codecpar->codec_id == AV_CODEC_ID_AAC_LATM ||
    1738           0 :              (st->request_probe == 0 && st->codecpar->codec_id == AV_CODEC_ID_NONE) ||
    1739           0 :              st->request_probe > 0) &&
    1740           0 :             mp4_descr->dec_config_descr_len && mp4_descr->es_id == pid) {
    1741             :             AVIOContext pb;
    1742           0 :             ffio_init_context(&pb, mp4_descr->dec_config_descr,
    1743             :                               mp4_descr->dec_config_descr_len, 0,
    1744             :                               NULL, NULL, NULL, NULL);
    1745           0 :             ff_mp4_read_dec_config_descr(fc, st, &pb);
    1746           0 :             if (st->codecpar->codec_id == AV_CODEC_ID_AAC &&
    1747           0 :                 st->codecpar->extradata_size > 0) {
    1748           0 :                 st->request_probe = st->need_parsing = 0;
    1749           0 :                 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
    1750           0 :                 st->internal->need_context_update = 1;
    1751             :             }
    1752             :         }
    1753           0 :         break;
    1754           0 :     case 0x56: /* DVB teletext descriptor */
    1755             :         {
    1756           0 :             uint8_t *extradata = NULL;
    1757           0 :             int language_count = desc_len / 5;
    1758             : 
    1759           0 :             if (desc_len > 0 && desc_len % 5 != 0)
    1760           0 :                 return AVERROR_INVALIDDATA;
    1761             : 
    1762           0 :             if (language_count > 0) {
    1763             :                 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
    1764           0 :                 av_assert0(language_count <= sizeof(language) / 4);
    1765             : 
    1766           0 :                 if (st->codecpar->extradata == NULL) {
    1767           0 :                     if (ff_alloc_extradata(st->codecpar, language_count * 2)) {
    1768           0 :                         return AVERROR(ENOMEM);
    1769             :                     }
    1770             :                 }
    1771             : 
    1772           0 :                 if (st->codecpar->extradata_size < language_count * 2)
    1773           0 :                     return AVERROR_INVALIDDATA;
    1774             : 
    1775           0 :                 extradata = st->codecpar->extradata;
    1776             : 
    1777           0 :                 for (i = 0; i < language_count; i++) {
    1778           0 :                     language[i * 4 + 0] = get8(pp, desc_end);
    1779           0 :                     language[i * 4 + 1] = get8(pp, desc_end);
    1780           0 :                     language[i * 4 + 2] = get8(pp, desc_end);
    1781           0 :                     language[i * 4 + 3] = ',';
    1782             : 
    1783           0 :                     memcpy(extradata, *pp, 2);
    1784           0 :                     extradata += 2;
    1785             : 
    1786           0 :                     *pp += 2;
    1787             :                 }
    1788             : 
    1789           0 :                 language[i * 4 - 1] = 0;
    1790           0 :                 av_dict_set(&st->metadata, "language", language, 0);
    1791           0 :                 st->internal->need_context_update = 1;
    1792             :             }
    1793             :         }
    1794           0 :         break;
    1795           1 :     case 0x59: /* subtitling descriptor */
    1796             :         {
    1797             :             /* 8 bytes per DVB subtitle substream data:
    1798             :              * ISO_639_language_code (3 bytes),
    1799             :              * subtitling_type (1 byte),
    1800             :              * composition_page_id (2 bytes),
    1801             :              * ancillary_page_id (2 bytes) */
    1802           1 :             int language_count = desc_len / 8;
    1803             : 
    1804           1 :             if (desc_len > 0 && desc_len % 8 != 0)
    1805           0 :                 return AVERROR_INVALIDDATA;
    1806             : 
    1807           1 :             if (language_count > 1) {
    1808           0 :                 avpriv_request_sample(fc, "DVB subtitles with multiple languages");
    1809             :             }
    1810             : 
    1811           1 :             if (language_count > 0) {
    1812             :                 uint8_t *extradata;
    1813             : 
    1814             :                 /* 4 bytes per language code (3 bytes) with comma or NUL byte should fit language buffer */
    1815           1 :                 av_assert0(language_count <= sizeof(language) / 4);
    1816             : 
    1817           1 :                 if (st->codecpar->extradata == NULL) {
    1818           1 :                     if (ff_alloc_extradata(st->codecpar, language_count * 5)) {
    1819           0 :                         return AVERROR(ENOMEM);
    1820             :                     }
    1821             :                 }
    1822             : 
    1823           1 :                 if (st->codecpar->extradata_size < language_count * 5)
    1824           0 :                     return AVERROR_INVALIDDATA;
    1825             : 
    1826           1 :                 extradata = st->codecpar->extradata;
    1827             : 
    1828           2 :                 for (i = 0; i < language_count; i++) {
    1829           1 :                     language[i * 4 + 0] = get8(pp, desc_end);
    1830           1 :                     language[i * 4 + 1] = get8(pp, desc_end);
    1831           1 :                     language[i * 4 + 2] = get8(pp, desc_end);
    1832           1 :                     language[i * 4 + 3] = ',';
    1833             : 
    1834             :                     /* hearing impaired subtitles detection using subtitling_type */
    1835           1 :                     switch (*pp[0]) {
    1836           0 :                     case 0x20: /* DVB subtitles (for the hard of hearing) with no monitor aspect ratio criticality */
    1837             :                     case 0x21: /* DVB subtitles (for the hard of hearing) for display on 4:3 aspect ratio monitor */
    1838             :                     case 0x22: /* DVB subtitles (for the hard of hearing) for display on 16:9 aspect ratio monitor */
    1839             :                     case 0x23: /* DVB subtitles (for the hard of hearing) for display on 2.21:1 aspect ratio monitor */
    1840             :                     case 0x24: /* DVB subtitles (for the hard of hearing) for display on a high definition monitor */
    1841             :                     case 0x25: /* DVB subtitles (for the hard of hearing) with plano-stereoscopic disparity for display on a high definition monitor */
    1842           0 :                         st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
    1843           0 :                         break;
    1844             :                     }
    1845             : 
    1846           1 :                     extradata[4] = get8(pp, desc_end); /* subtitling_type */
    1847           1 :                     memcpy(extradata, *pp, 4); /* composition_page_id and ancillary_page_id */
    1848           1 :                     extradata += 5;
    1849             : 
    1850           1 :                     *pp += 4;
    1851             :                 }
    1852             : 
    1853           1 :                 language[i * 4 - 1] = 0;
    1854           1 :                 av_dict_set(&st->metadata, "language", language, 0);
    1855           1 :                 st->internal->need_context_update = 1;
    1856             :             }
    1857             :         }
    1858           1 :         break;
    1859          76 :     case 0x0a: /* ISO 639 language descriptor */
    1860         146 :         for (i = 0; i + 4 <= desc_len; i += 4) {
    1861          70 :             language[i + 0] = get8(pp, desc_end);
    1862          70 :             language[i + 1] = get8(pp, desc_end);
    1863          70 :             language[i + 2] = get8(pp, desc_end);
    1864          70 :             language[i + 3] = ',';
    1865          70 :             switch (get8(pp, desc_end)) {
    1866           0 :             case 0x01:
    1867           0 :                 st->disposition |= AV_DISPOSITION_CLEAN_EFFECTS;
    1868           0 :                 break;
    1869           0 :             case 0x02:
    1870           0 :                 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
    1871           0 :                 break;
    1872          12 :             case 0x03:
    1873          12 :                 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
    1874          12 :                 st->disposition |= AV_DISPOSITION_DESCRIPTIONS;
    1875          12 :                 break;
    1876             :             }
    1877             :         }
    1878          76 :         if (i && language[0]) {
    1879          66 :             language[i - 1] = 0;
    1880             :             /* don't overwrite language, as it may already have been set by
    1881             :              * another, more specific descriptor (e.g. supplementary audio) */
    1882          66 :             av_dict_set(&st->metadata, "language", language, AV_DICT_DONT_OVERWRITE);
    1883             :         }
    1884          76 :         break;
    1885           8 :     case 0x05: /* registration descriptor */
    1886           8 :         st->codecpar->codec_tag = bytestream_get_le32(pp);
    1887           8 :         av_log(fc, AV_LOG_TRACE, "reg_desc=%.4s\n", (char *)&st->codecpar->codec_tag);
    1888           8 :         if (st->codecpar->codec_id == AV_CODEC_ID_NONE || st->request_probe > 0) {
    1889           3 :             mpegts_find_stream_type(st, st->codecpar->codec_tag, REGD_types);
    1890           3 :             if (st->codecpar->codec_tag == MKTAG('B', 'S', 'S', 'D'))
    1891           2 :                 st->request_probe = 50;
    1892             :         }
    1893           8 :         break;
    1894          15 :     case 0x52: /* stream identifier descriptor */
    1895          15 :         st->stream_identifier = 1 + get8(pp, desc_end);
    1896          15 :         break;
    1897           0 :     case 0x26: /* metadata descriptor */
    1898           0 :         if (get16(pp, desc_end) == 0xFFFF)
    1899           0 :             *pp += 4;
    1900           0 :         if (get8(pp, desc_end) == 0xFF) {
    1901           0 :             st->codecpar->codec_tag = bytestream_get_le32(pp);
    1902           0 :             if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
    1903           0 :                 mpegts_find_stream_type(st, st->codecpar->codec_tag, METADATA_types);
    1904             :         }
    1905           0 :         break;
    1906           4 :     case 0x7f: /* DVB extension descriptor */
    1907           4 :         ext_desc_tag = get8(pp, desc_end);
    1908           4 :         if (ext_desc_tag < 0)
    1909           0 :             return AVERROR_INVALIDDATA;
    1910           4 :         if (st->codecpar->codec_id == AV_CODEC_ID_OPUS &&
    1911             :             ext_desc_tag == 0x80) { /* User defined (provisional Opus) */
    1912           3 :             if (!st->codecpar->extradata) {
    1913           1 :                 st->codecpar->extradata = av_mallocz(sizeof(opus_default_extradata) +
    1914             :                                                      AV_INPUT_BUFFER_PADDING_SIZE);
    1915           1 :                 if (!st->codecpar->extradata)
    1916           0 :                     return AVERROR(ENOMEM);
    1917             : 
    1918           1 :                 st->codecpar->extradata_size = sizeof(opus_default_extradata);
    1919           1 :                 memcpy(st->codecpar->extradata, opus_default_extradata, sizeof(opus_default_extradata));
    1920             : 
    1921           1 :                 channel_config_code = get8(pp, desc_end);
    1922           1 :                 if (channel_config_code < 0)
    1923           0 :                     return AVERROR_INVALIDDATA;
    1924           1 :                 if (channel_config_code <= 0x8) {
    1925           1 :                     st->codecpar->extradata[9]  = channels = channel_config_code ? channel_config_code : 2;
    1926           1 :                     st->codecpar->extradata[18] = channel_config_code ? (channels > 2) : /* Dual Mono */ 255;
    1927           1 :                     st->codecpar->extradata[19] = opus_stream_cnt[channel_config_code];
    1928           1 :                     st->codecpar->extradata[20] = opus_coupled_stream_cnt[channel_config_code];
    1929           1 :                     memcpy(&st->codecpar->extradata[21], opus_channel_map[channels - 1], channels);
    1930             :                 } else {
    1931           0 :                     avpriv_request_sample(fc, "Opus in MPEG-TS - channel_config_code > 0x8");
    1932             :                 }
    1933           1 :                 st->need_parsing = AVSTREAM_PARSE_FULL;
    1934           1 :                 st->internal->need_context_update = 1;
    1935             :             }
    1936             :         }
    1937           4 :         if (ext_desc_tag == 0x06) { /* supplementary audio descriptor */
    1938             :             int flags;
    1939             : 
    1940           0 :             if (desc_len < 1)
    1941           0 :                 return AVERROR_INVALIDDATA;
    1942           0 :             flags = get8(pp, desc_end);
    1943             : 
    1944           0 :             if ((flags & 0x80) == 0) /* mix_type */
    1945           0 :                 st->disposition |= AV_DISPOSITION_DEPENDENT;
    1946             : 
    1947           0 :             switch ((flags >> 2) & 0x1F) { /* editorial_classification */
    1948           0 :             case 0x01:
    1949           0 :                 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
    1950           0 :                 st->disposition |= AV_DISPOSITION_DESCRIPTIONS;
    1951           0 :                 break;
    1952           0 :             case 0x02:
    1953           0 :                 st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
    1954           0 :                 break;
    1955           0 :             case 0x03:
    1956           0 :                 st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
    1957           0 :                 break;
    1958             :             }
    1959             : 
    1960           0 :             if (flags & 0x01) { /* language_code_present */
    1961           0 :                 if (desc_len < 4)
    1962           0 :                     return AVERROR_INVALIDDATA;
    1963           0 :                 language[0] = get8(pp, desc_end);
    1964           0 :                 language[1] = get8(pp, desc_end);
    1965           0 :                 language[2] = get8(pp, desc_end);
    1966           0 :                 language[3] = 0;
    1967             : 
    1968             :                 /* This language always has to override a possible
    1969             :                  * ISO 639 language descriptor language */
    1970           0 :                 if (language[0])
    1971           0 :                     av_dict_set(&st->metadata, "language", language, 0);
    1972             :             }
    1973             :         }
    1974           4 :         break;
    1975           6 :     case 0x6a: /* ac-3_descriptor */
    1976             :         {
    1977           6 :             int component_type_flag = get8(pp, desc_end) & (1 << 7);
    1978           6 :             if (component_type_flag) {
    1979           0 :                 int component_type = get8(pp, desc_end);
    1980           0 :                 int service_type_mask = 0x38;  // 0b00111000
    1981           0 :                 int service_type = ((component_type & service_type_mask) >> 3);
    1982           0 :                 if (service_type == 0x02 /* 0b010 */) {
    1983           0 :                     st->disposition |= AV_DISPOSITION_DESCRIPTIONS;
    1984           0 :                     av_log(ts->stream, AV_LOG_DEBUG, "New track disposition for id %u: %u\n", st->id, st->disposition);
    1985             :                 }
    1986             :             }
    1987             :         }
    1988           6 :         break;
    1989           0 :     case 0x7a: /* enhanced_ac-3_descriptor */
    1990             :         {
    1991           0 :             int component_type_flag = get8(pp, desc_end) & (1 << 7);
    1992           0 :             if (component_type_flag) {
    1993           0 :                 int component_type = get8(pp, desc_end);
    1994           0 :                 int service_type_mask = 0x38;  // 0b00111000
    1995           0 :                 int service_type = ((component_type & service_type_mask) >> 3);
    1996           0 :                 if (service_type == 0x02 /* 0b010 */) {
    1997           0 :                     st->disposition |= AV_DISPOSITION_DESCRIPTIONS;
    1998           0 :                     av_log(ts->stream, AV_LOG_DEBUG, "New track disposition for id %u: %u\n", st->id, st->disposition);
    1999             :                 }
    2000             :             }
    2001             :         }
    2002           0 :         break;
    2003          44 :     default:
    2004          44 :         break;
    2005             :     }
    2006         154 :     *pp = desc_end;
    2007         154 :     return 0;
    2008             : }
    2009             : 
    2010          12 : static AVStream *find_matching_stream(MpegTSContext *ts, int pid,
    2011             :                                       int stream_id, int pmt_stream_idx)
    2012             : {
    2013          12 :     AVFormatContext *s = ts->stream;
    2014             :     int i;
    2015          12 :     AVStream *found = NULL;
    2016             : 
    2017          40 :     for (i = 0; i < s->nb_streams; i++) {
    2018          35 :         AVStream *st = s->streams[i];
    2019          35 :         if (stream_id != -1) { /* match based on "stream identifier descriptor" if present */
    2020           0 :             if (st->stream_identifier == stream_id+1) {
    2021           0 :                 found = st;
    2022           0 :                 break;
    2023             :             }
    2024          35 :         } else if (st->pmt_stream_idx == pmt_stream_idx) { /* match based on position within the PMT */
    2025           7 :             found = st;
    2026           7 :             break;
    2027             :         }
    2028             :     }
    2029             : 
    2030          12 :     if (found) {
    2031          14 :         av_log(ts->stream, AV_LOG_VERBOSE,
    2032             :                "re-using existing %s stream %d (pid=0x%x) for new pid=0x%x\n",
    2033           7 :                av_get_media_type_string(found->codecpar->codec_type),
    2034             :                i, found->id, pid);
    2035             :     }
    2036             : 
    2037          12 :     return found;
    2038             : }
    2039             : 
    2040          30 : static int parse_stream_identifier_desc(const uint8_t *p, const uint8_t *p_end)
    2041             : {
    2042          30 :     const uint8_t **pp = &p;
    2043             :     const uint8_t *desc_list_end;
    2044             :     const uint8_t *desc_end;
    2045             :     int desc_list_len;
    2046             :     int desc_len, desc_tag;
    2047             : 
    2048          30 :     desc_list_len = get16(pp, p_end);
    2049          30 :     if (desc_list_len < 0)
    2050           0 :         return -1;
    2051          30 :     desc_list_len &= 0xfff;
    2052          30 :     desc_list_end  = p + desc_list_len;
    2053          30 :     if (desc_list_end > p_end)
    2054           0 :         return -1;
    2055             : 
    2056             :     while (1) {
    2057         102 :         desc_tag = get8(pp, desc_list_end);
    2058          66 :         if (desc_tag < 0)
    2059          30 :             return -1;
    2060          36 :         desc_len = get8(pp, desc_list_end);
    2061          36 :         if (desc_len < 0)
    2062           0 :             return -1;
    2063          36 :         desc_end = *pp + desc_len;
    2064          36 :         if (desc_end > desc_list_end)
    2065           0 :             return -1;
    2066             : 
    2067          36 :         if (desc_tag == 0x52) {
    2068           0 :             return get8(pp, desc_end);
    2069             :         }
    2070          36 :         *pp = desc_end;
    2071             :     }
    2072             : 
    2073             :     return -1;
    2074             : }
    2075             : 
    2076          63 : static int is_pes_stream(int stream_type, uint32_t prog_reg_desc)
    2077             : {
    2078         120 :     return !(stream_type == 0x13 ||
    2079           6 :              (stream_type == 0x86 && prog_reg_desc == AV_RL32("CUEI")) );
    2080             : }
    2081             : 
    2082        3333 : static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
    2083             : {
    2084        3333 :     MpegTSContext *ts = filter->u.section_filter.opaque;
    2085        3333 :     MpegTSSectionFilter *tssf = &filter->u.section_filter;
    2086        3333 :     SectionHeader h1, *h = &h1;
    2087             :     PESContext *pes;
    2088             :     AVStream *st;
    2089             :     const uint8_t *p, *p_end, *desc_list_end;
    2090             :     int program_info_length, pcr_pid, pid, stream_type;
    2091             :     int desc_list_len;
    2092        3333 :     uint32_t prog_reg_desc = 0; /* registration descriptor */
    2093        3333 :     int stream_id = -1;
    2094             : 
    2095        3333 :     int mp4_descr_count = 0;
    2096        3333 :     Mp4Descr mp4_descr[MAX_MP4_DESCR_COUNT] = { { 0 } };
    2097             :     int i;
    2098             : 
    2099        3333 :     av_log(ts->stream, AV_LOG_TRACE, "PMT: len %i\n", section_len);
    2100             :     hex_dump_debug(ts->stream, section, section_len);
    2101             : 
    2102        3333 :     p_end = section + section_len - 4;
    2103        3333 :     p = section;
    2104        3333 :     if (parse_section_header(h, &p, p_end) < 0)
    2105        3121 :         return;
    2106        3333 :     if (h->tid != PMT_TID)
    2107          15 :         return;
    2108        3318 :     if (skip_identical(h, tssf))
    2109        3106 :         return;
    2110             : 
    2111        1060 :     av_log(ts->stream, AV_LOG_TRACE, "sid=0x%x sec_num=%d/%d version=%d tid=%d\n",
    2112        1060 :             h->id, h->sec_num, h->last_sec_num, h->version, h->tid);
    2113             : 
    2114         212 :     if (!ts->scan_all_pmts && ts->skip_changes)
    2115           0 :         return;
    2116             : 
    2117         212 :     if (ts->skip_unknown_pmt && !get_program(ts, h->id))
    2118           0 :         return;
    2119         212 :     if (!ts->skip_clear)
    2120         150 :         clear_program(ts, h->id);
    2121             : 
    2122         212 :     pcr_pid = get16(&p, p_end);
    2123         212 :     if (pcr_pid < 0)
    2124           0 :         return;
    2125         212 :     pcr_pid &= 0x1fff;
    2126         212 :     add_pid_to_pmt(ts, h->id, pcr_pid);
    2127         212 :     update_av_program_info(ts->stream, h->id, pcr_pid, h->version);
    2128             : 
    2129         212 :     av_log(ts->stream, AV_LOG_TRACE, "pcr_pid=0x%x\n", pcr_pid);
    2130             : 
    2131         212 :     program_info_length = get16(&p, p_end);
    2132         212 :     if (program_info_length < 0)
    2133           0 :         return;
    2134         212 :     program_info_length &= 0xfff;
    2135         490 :     while (program_info_length >= 2) {
    2136             :         uint8_t tag, len;
    2137          66 :         tag = get8(&p, p_end);
    2138          66 :         len = get8(&p, p_end);
    2139             : 
    2140          66 :         av_log(ts->stream, AV_LOG_TRACE, "program tag: 0x%02x len=%d\n", tag, len);
    2141             : 
    2142          66 :         if (len > program_info_length - 2)
    2143             :             // something else is broken, exit the program_descriptors_loop
    2144           0 :             break;
    2145          66 :         program_info_length -= len + 2;
    2146          66 :         if (tag == 0x1d) { // IOD descriptor
    2147           0 :             get8(&p, p_end); // scope
    2148           0 :             get8(&p, p_end); // label
    2149           0 :             len -= 2;
    2150           0 :             mp4_read_iods(ts->stream, p, len, mp4_descr + mp4_descr_count,
    2151             :                           &mp4_descr_count, MAX_MP4_DESCR_COUNT);
    2152          66 :         } else if (tag == 0x05 && len >= 4) { // registration descriptor
    2153          24 :             prog_reg_desc = bytestream_get_le32(&p);
    2154          24 :             len -= 4;
    2155             :         }
    2156          66 :         p += len;
    2157             :     }
    2158         212 :     p += program_info_length;
    2159         212 :     if (p >= p_end)
    2160           0 :         goto out;
    2161             : 
    2162             :     // stop parsing after pmt, we found header
    2163         212 :     if (!ts->stream->nb_streams)
    2164          33 :         ts->stop_parse = 2;
    2165             : 
    2166         212 :     set_pmt_found(ts, h->id);
    2167             : 
    2168             : 
    2169         605 :     for (i = 0; ; i++) {
    2170         998 :         st = 0;
    2171         605 :         pes = NULL;
    2172         605 :         stream_type = get8(&p, p_end);
    2173         605 :         if (stream_type < 0)
    2174         212 :             break;
    2175         393 :         pid = get16(&p, p_end);
    2176         393 :         if (pid < 0)
    2177           0 :             goto out;
    2178         393 :         pid &= 0x1fff;
    2179         393 :         if (pid == ts->current_pid)
    2180           0 :             goto out;
    2181             : 
    2182         393 :         if (ts->merge_pmt_versions)
    2183          30 :             stream_id = parse_stream_identifier_desc(p, p_end);
    2184             : 
    2185             :         /* now create stream */
    2186         393 :         if (ts->pids[pid] && ts->pids[pid]->type == MPEGTS_PES) {
    2187         330 :             pes = ts->pids[pid]->u.pes_filter.opaque;
    2188         330 :             if (ts->merge_pmt_versions && !pes->st) {
    2189           0 :                 st = find_matching_stream(ts, pid, stream_id, i);
    2190           0 :                 if (st) {
    2191           0 :                     pes->st = st;
    2192           0 :                     pes->stream_type = stream_type;
    2193             :                 }
    2194             :             }
    2195         330 :             if (!pes->st) {
    2196           0 :                 pes->st = avformat_new_stream(pes->stream, NULL);
    2197           0 :                 if (!pes->st)
    2198           0 :                     goto out;
    2199           0 :                 pes->st->id = pes->pid;
    2200           0 :                 pes->st->program_num = h->id;
    2201           0 :                 pes->st->pmt_version = h->version;
    2202           0 :                 pes->st->pmt_stream_idx = i;
    2203             :             }
    2204         330 :             st = pes->st;
    2205          63 :         } else if (is_pes_stream(stream_type, prog_reg_desc)) {
    2206          57 :             if (ts->pids[pid])
    2207           0 :                 mpegts_close_filter(ts, ts->pids[pid]); // wrongly added sdt filter probably
    2208          57 :             pes = add_pes_stream(ts, pid, pcr_pid);
    2209          57 :             if (ts->merge_pmt_versions && pes && !pes->st) {
    2210           8 :                 st = find_matching_stream(ts, pid, stream_id, i);
    2211           8 :                 if (st) {
    2212           4 :                     pes->st = st;
    2213           4 :                     pes->stream_type = stream_type;
    2214             :                 }
    2215             :             }
    2216          57 :             if (pes && !pes->st) {
    2217          53 :                 st = avformat_new_stream(pes->stream, NULL);
    2218          53 :                 if (!st)
    2219           0 :                     goto out;
    2220          53 :                 st->id = pes->pid;
    2221          53 :                 st->program_num = h->id;
    2222          53 :                 st->pmt_version = h->version;
    2223          53 :                 st->pmt_stream_idx = i;
    2224             :             }
    2225             :         } else {
    2226           6 :             int idx = ff_find_stream_index(ts->stream, pid);
    2227           6 :             if (idx >= 0) {
    2228           2 :                 st = ts->stream->streams[idx];
    2229             :             }
    2230           6 :             if (ts->merge_pmt_versions && !st) {
    2231           4 :                 st = find_matching_stream(ts, pid, stream_id, i);
    2232             :             }
    2233           6 :             if (!st) {
    2234           1 :                 st = avformat_new_stream(ts->stream, NULL);
    2235           1 :                 if (!st)
    2236           0 :                     goto out;
    2237           1 :                 st->id = pid;
    2238           1 :                 st->program_num = h->id;
    2239           1 :                 st->pmt_version = h->version;
    2240           1 :                 st->pmt_stream_idx = i;
    2241           1 :                 st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
    2242           1 :                 if (stream_type == 0x86 && prog_reg_desc == AV_RL32("CUEI")) {
    2243           1 :                     mpegts_find_stream_type(st, stream_type, SCTE_types);
    2244           1 :                     mpegts_open_section_filter(ts, pid, scte_data_cb, ts, 1);
    2245             :                 }
    2246             :             }
    2247             :         }
    2248             : 
    2249         393 :         if (!st)
    2250           0 :             goto out;
    2251             : 
    2252         393 :         if (pes && !pes->stream_type)
    2253          53 :             mpegts_set_stream_info(st, pes, stream_type, prog_reg_desc);
    2254             : 
    2255         393 :         add_pid_to_pmt(ts, h->id, pid);
    2256             : 
    2257         393 :         av_program_add_stream_index(ts->stream, h->id, st->index);
    2258             : 
    2259         393 :         desc_list_len = get16(&p, p_end);
    2260         393 :         if (desc_list_len < 0)
    2261           0 :             goto out;
    2262         393 :         desc_list_len &= 0xfff;
    2263         393 :         desc_list_end  = p + desc_list_len;
    2264         393 :         if (desc_list_end > p_end)
    2265           0 :             goto out;
    2266             :         for (;;) {
    2267         693 :             if (ff_parse_mpeg2_descriptor(ts->stream, st, stream_type, &p,
    2268             :                                           desc_list_end, mp4_descr,
    2269             :                                           mp4_descr_count, pid, ts) < 0)
    2270         393 :                 break;
    2271             : 
    2272         150 :             if (pes && prog_reg_desc == AV_RL32("HDMV") &&
    2273           0 :                 stream_type == 0x83 && pes->sub_st) {
    2274           0 :                 av_program_add_stream_index(ts->stream, h->id,
    2275           0 :                                             pes->sub_st->index);
    2276           0 :                 pes->sub_st->codecpar->codec_tag = st->codecpar->codec_tag;
    2277             :             }
    2278             :         }
    2279         393 :         p = desc_list_end;
    2280             :     }
    2281             : 
    2282         212 :     if (!ts->pids[pcr_pid])
    2283           0 :         mpegts_open_pcr_filter(ts, pcr_pid);
    2284             : 
    2285         424 : out:
    2286         212 :     for (i = 0; i < mp4_descr_count; i++)
    2287           0 :         av_free(mp4_descr[i].dec_config_descr);
    2288             : }
    2289             : 
    2290        3365 : static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
    2291             : {
    2292        3365 :     MpegTSContext *ts = filter->u.section_filter.opaque;
    2293        3365 :     MpegTSSectionFilter *tssf = &filter->u.section_filter;
    2294        3365 :     SectionHeader h1, *h = &h1;
    2295             :     const uint8_t *p, *p_end;
    2296             :     int sid, pmt_pid;
    2297             :     AVProgram *program;
    2298             : 
    2299        3365 :     av_log(ts->stream, AV_LOG_TRACE, "PAT:\n");
    2300             :     hex_dump_debug(ts->stream, section, section_len);
    2301             : 
    2302        3365 :     p_end = section + section_len - 4;
    2303        3365 :     p     = section;
    2304        3365 :     if (parse_section_header(h, &p, p_end) < 0)
    2305        3185 :         return;
    2306        3365 :     if (h->tid != PAT_TID)
    2307           0 :         return;
    2308        3365 :     if (ts->skip_changes)
    2309         499 :         return;
    2310             : 
    2311        2866 :     if (skip_identical(h, tssf))
    2312        2686 :         return;
    2313         180 :     ts->stream->ts_id = h->id;
    2314             : 
    2315         180 :     clear_programs(ts);
    2316             :     for (;;) {
    2317         540 :         sid = get16(&p, p_end);
    2318         360 :         if (sid < 0)
    2319         180 :             break;
    2320         180 :         pmt_pid = get16(&p, p_end);
    2321         180 :         if (pmt_pid < 0)
    2322           0 :             break;
    2323         180 :         pmt_pid &= 0x1fff;
    2324             : 
    2325         180 :         if (pmt_pid == ts->current_pid)
    2326           0 :             break;
    2327             : 
    2328         180 :         av_log(ts->stream, AV_LOG_TRACE, "sid=0x%x pid=0x%x\n", sid, pmt_pid);
    2329             : 
    2330         180 :         if (sid == 0x0000) {
    2331             :             /* NIT info */
    2332             :         } else {
    2333         180 :             MpegTSFilter *fil = ts->pids[pmt_pid];
    2334         180 :             program = av_new_program(ts->stream, sid);
    2335         180 :             if (program) {
    2336         180 :                 program->program_num = sid;
    2337         180 :                 program->pmt_pid = pmt_pid;
    2338             :             }
    2339         180 :             if (fil)
    2340         147 :                 if (   fil->type != MPEGTS_SECTION
    2341         147 :                     || fil->pid != pmt_pid
    2342         147 :                     || fil->u.section_filter.section_cb != pmt_cb)
    2343           0 :                     mpegts_close_filter(ts, ts->pids[pmt_pid]);
    2344             : 
    2345         180 :             if (!ts->pids[pmt_pid])
    2346          33 :                 mpegts_open_section_filter(ts, pmt_pid, pmt_cb, ts, 1);
    2347         180 :             add_pat_entry(ts, sid);
    2348         180 :             add_pid_to_pmt(ts, sid, 0); // add pat pid to program
    2349         180 :             add_pid_to_pmt(ts, sid, pmt_pid);
    2350             :         }
    2351             :     }
    2352             : 
    2353         180 :     if (sid < 0) {
    2354             :         int i,j;
    2355         360 :         for (j=0; j<ts->stream->nb_programs; j++) {
    2356         180 :             for (i = 0; i < ts->nb_prg; i++)
    2357         180 :                 if (ts->prg[i].id == ts->stream->programs[j]->id)
    2358         180 :                     break;
    2359         180 :             if (i==ts->nb_prg && !ts->skip_clear)
    2360           0 :                 clear_avprogram(ts, ts->stream->programs[j]->id);
    2361             :         }
    2362             :     }
    2363             : }
    2364             : 
    2365         607 : static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len)
    2366             : {
    2367         607 :     MpegTSContext *ts = filter->u.section_filter.opaque;
    2368         607 :     MpegTSSectionFilter *tssf = &filter->u.section_filter;
    2369         607 :     SectionHeader h1, *h = &h1;
    2370             :     const uint8_t *p, *p_end, *desc_list_end, *desc_end;
    2371             :     int onid, val, sid, desc_list_len, desc_tag, desc_len, service_type;
    2372             :     char *name, *provider_name;
    2373             : 
    2374         607 :     av_log(ts->stream, AV_LOG_TRACE, "SDT:\n");
    2375             :     hex_dump_debug(ts->stream, section, section_len);
    2376             : 
    2377         607 :     p_end = section + section_len - 4;
    2378         607 :     p     = section;
    2379         607 :     if (parse_section_header(h, &p, p_end) < 0)
    2380         477 :         return;
    2381         607 :     if (h->tid != SDT_TID)
    2382           0 :         return;
    2383         607 :     if (ts->skip_changes)
    2384          86 :         return;
    2385         521 :     if (skip_identical(h, tssf))
    2386         391 :         return;
    2387             : 
    2388         130 :     onid = get16(&p, p_end);
    2389         130 :     if (onid < 0)
    2390           0 :         return;
    2391         130 :     val = get8(&p, p_end);
    2392         130 :     if (val < 0)
    2393           0 :         return;
    2394             :     for (;;) {
    2395         390 :         sid = get16(&p, p_end);
    2396         260 :         if (sid < 0)
    2397         130 :             break;
    2398         130 :         val = get8(&p, p_end);
    2399         130 :         if (val < 0)
    2400           0 :             break;
    2401         130 :         desc_list_len = get16(&p, p_end);
    2402         130 :         if (desc_list_len < 0)
    2403           0 :             break;
    2404         130 :         desc_list_len &= 0xfff;
    2405         130 :         desc_list_end  = p + desc_list_len;
    2406         130 :         if (desc_list_end > p_end)
    2407           0 :             break;
    2408             :         for (;;) {
    2409         390 :             desc_tag = get8(&p, desc_list_end);
    2410         260 :             if (desc_tag < 0)
    2411         130 :                 break;
    2412         130 :             desc_len = get8(&p, desc_list_end);
    2413         130 :             desc_end = p + desc_len;
    2414         130 :             if (desc_len < 0 || desc_end > desc_list_end)
    2415             :                 break;
    2416             : 
    2417         130 :             av_log(ts->stream, AV_LOG_TRACE, "tag: 0x%02x len=%d\n",
    2418             :                     desc_tag, desc_len);
    2419             : 
    2420         130 :             switch (desc_tag) {
    2421         130 :             case 0x48:
    2422         130 :                 service_type = get8(&p, p_end);
    2423         130 :                 if (service_type < 0)
    2424           0 :                     break;
    2425         130 :                 provider_name = getstr8(&p, p_end);
    2426         130 :                 if (!provider_name)
    2427           0 :                     break;
    2428         130 :                 name = getstr8(&p, p_end);
    2429         130 :                 if (name) {
    2430         130 :                     AVProgram *program = av_new_program(ts->stream, sid);
    2431         130 :                     if (program) {
    2432         130 :                         av_dict_set(&program->metadata, "service_name", name, 0);
    2433         130 :                         av_dict_set(&program->metadata, "service_provider",
    2434             :                                     provider_name, 0);
    2435             :                     }
    2436             :                 }
    2437         130 :                 av_free(name);
    2438         130 :                 av_free(provider_name);
    2439         130 :                 break;
    2440           0 :             default:
    2441           0 :                 break;
    2442             :             }
    2443         130 :             p = desc_end;
    2444             :         }
    2445         130 :         p = desc_list_end;
    2446             :     }
    2447             : }
    2448             : 
    2449             : static int parse_pcr(int64_t *ppcr_high, int *ppcr_low,
    2450             :                      const uint8_t *packet);
    2451             : 
    2452             : /* handle one TS packet */
    2453      275080 : static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
    2454             : {
    2455             :     MpegTSFilter *tss;
    2456             :     int len, pid, cc, expected_cc, cc_ok, afc, is_start, is_discontinuity,
    2457             :         has_adaptation, has_payload;
    2458             :     const uint8_t *p, *p_end;
    2459             :     int64_t pos;
    2460             : 
    2461      275080 :     pid = AV_RB16(packet + 1) & 0x1fff;
    2462      275080 :     if (pid && discard_pid(ts, pid))
    2463           0 :         return 0;
    2464      275080 :     is_start = packet[1] & 0x40;
    2465      275080 :     tss = ts->pids[pid];
    2466      275080 :     if (ts->auto_guess && !tss && is_start) {
    2467          14 :         add_pes_stream(ts, pid, -1);
    2468          14 :         tss = ts->pids[pid];
    2469             :     }
    2470      275080 :     if (!tss)
    2471        9047 :         return 0;
    2472      266033 :     ts->current_pid = pid;
    2473             : 
    2474      266033 :     afc = (packet[3] >> 4) & 3;
    2475      266033 :     if (afc == 0) /* reserved value */
    2476           0 :         return 0;
    2477      266033 :     has_adaptation   = afc & 2;
    2478      266033 :     has_payload      = afc & 1;
    2479      306618 :     is_discontinuity = has_adaptation &&
    2480      306585 :                        packet[4] != 0 && /* with length > 0 */
    2481       40552 :                        (packet[5] & 0x80); /* and discontinuity indicated */
    2482             : 
    2483             :     /* continuity check (currently not used) */
    2484      266033 :     cc = (packet[3] & 0xf);
    2485      266033 :     expected_cc = has_payload ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
    2486      532066 :     cc_ok = pid == 0x1FFF || // null packet PID
    2487      266033 :             is_discontinuity ||
    2488      797191 :             tss->last_cc < 0 ||
    2489             :             expected_cc == cc;
    2490             : 
    2491      266033 :     tss->last_cc = cc;
    2492      266033 :     if (!cc_ok) {
    2493          27 :         av_log(ts->stream, AV_LOG_DEBUG,
    2494             :                "Continuity check failed for pid %d expected %d got %d\n",
    2495             :                pid, expected_cc, cc);
    2496          27 :         if (tss->type == MPEGTS_PES) {
    2497           6 :             PESContext *pc = tss->u.pes_filter.opaque;
    2498           6 :             pc->flags |= AV_PKT_FLAG_CORRUPT;
    2499             :         }
    2500             :     }
    2501             : 
    2502      266033 :     if (packet[1] & 0x80) {
    2503           9 :         av_log(ts->stream, AV_LOG_DEBUG, "Packet had TEI flag set; marking as corrupt\n");
    2504           9 :         if (tss->type == MPEGTS_PES) {
    2505           9 :             PESContext *pc = tss->u.pes_filter.opaque;
    2506           9 :             pc->flags |= AV_PKT_FLAG_CORRUPT;
    2507             :         }
    2508             :     }
    2509             : 
    2510      266033 :     p = packet + 4;
    2511      266033 :     if (has_adaptation) {
    2512             :         int64_t pcr_h;
    2513             :         int pcr_l;
    2514       40585 :         if (parse_pcr(&pcr_h, &pcr_l, packet) == 0)
    2515       18820 :             tss->last_pcr = pcr_h * 300 + pcr_l;
    2516             :         /* skip adaptation field */
    2517       40585 :         p += p[0] + 1;
    2518             :     }
    2519             :     /* if past the end of packet, ignore */
    2520      266033 :     p_end = packet + TS_PACKET_SIZE;
    2521      266033 :     if (p >= p_end || !has_payload)
    2522        1594 :         return 0;
    2523             : 
    2524      264439 :     pos = avio_tell(ts->stream->pb);
    2525      264439 :     if (pos >= 0) {
    2526      264439 :         av_assert0(pos >= TS_PACKET_SIZE);
    2527      264439 :         ts->pos47_full = pos - TS_PACKET_SIZE;
    2528             :     }
    2529             : 
    2530      264439 :     if (tss->type == MPEGTS_SECTION) {
    2531        7305 :         if (is_start) {
    2532             :             /* pointer field present */
    2533        7305 :             len = *p++;
    2534        7305 :             if (len > p_end - p)
    2535           0 :                 return 0;
    2536        7305 :             if (len && cc_ok) {
    2537             :                 /* write remaining section bytes */
    2538           0 :                 write_section_data(ts, tss,
    2539             :                                    p, len, 0);
    2540             :                 /* check whether filter has been closed */
    2541           0 :                 if (!ts->pids[pid])
    2542           0 :                     return 0;
    2543             :             }
    2544        7305 :             p += len;
    2545        7305 :             if (p < p_end) {
    2546        7305 :                 write_section_data(ts, tss,
    2547        7305 :                                    p, p_end - p, 1);
    2548             :             }
    2549             :         } else {
    2550           0 :             if (cc_ok) {
    2551           0 :                 write_section_data(ts, tss,
    2552           0 :                                    p, p_end - p, 0);
    2553             :             }
    2554             :         }
    2555             : 
    2556             :         // stop find_stream_info from waiting for more streams
    2557             :         // when all programs have received a PMT
    2558        7305 :         if (ts->stream->ctx_flags & AVFMTCTX_NOHEADER && ts->scan_all_pmts <= 0) {
    2559             :             int i;
    2560         246 :             for (i = 0; i < ts->nb_prg; i++) {
    2561         125 :                 if (!ts->prg[i].pmt_found)
    2562           4 :                     break;
    2563             :             }
    2564         125 :             if (i == ts->nb_prg && ts->nb_prg > 0) {
    2565         121 :                 int types = 0;
    2566         247 :                 for (i = 0; i < ts->stream->nb_streams; i++) {
    2567         126 :                     AVStream *st = ts->stream->streams[i];
    2568         126 :                     if (st->codecpar->codec_type >= 0)
    2569         126 :                         types |= 1<<st->codecpar->codec_type;
    2570             :                 }
    2571         121 :                 if ((types & (1<<AVMEDIA_TYPE_AUDIO) && types & (1<<AVMEDIA_TYPE_VIDEO)) || pos > 100000) {
    2572           9 :                     av_log(ts->stream, AV_LOG_DEBUG, "All programs have pmt, headers found\n");
    2573           9 :                     ts->stream->ctx_flags &= ~AVFMTCTX_NOHEADER;
    2574             :                 }
    2575             :             }
    2576             :         }
    2577             : 
    2578             :     } else {
    2579             :         int ret;
    2580             :         // Note: The position here points actually behind the current packet.
    2581      257134 :         if (tss->type == MPEGTS_PES) {
    2582      514268 :             if ((ret = tss->u.pes_filter.pes_cb(tss, p, p_end - p, is_start,
    2583      257134 :                                                 pos - ts->raw_packet_size)) < 0)
    2584           0 :                 return ret;
    2585             :         }
    2586             :     }
    2587             : 
    2588      264439 :     return 0;
    2589             : }
    2590             : 
    2591          45 : static void reanalyze(MpegTSContext *ts) {
    2592          45 :     AVIOContext *pb = ts->stream->pb;
    2593          45 :     int64_t pos = avio_tell(pb);
    2594          45 :     if (pos < 0)
    2595           0 :         return;
    2596          45 :     pos -= ts->pos47_full;
    2597          45 :     if (pos == TS_PACKET_SIZE) {
    2598           0 :         ts->size_stat[0] ++;
    2599          45 :     } else if (pos == TS_DVHS_PACKET_SIZE) {
    2600           0 :         ts->size_stat[1] ++;
    2601          45 :     } else if (pos == TS_FEC_PACKET_SIZE) {
    2602           0 :         ts->size_stat[2] ++;
    2603             :     }
    2604             : 
    2605          45 :     ts->size_stat_count ++;
    2606          45 :     if (ts->size_stat_count > SIZE_STAT_THRESHOLD) {
    2607           0 :         int newsize = 0;
    2608           0 :         if (ts->size_stat[0] > SIZE_STAT_THRESHOLD) {
    2609           0 :             newsize = TS_PACKET_SIZE;
    2610           0 :         } else if (ts->size_stat[1] > SIZE_STAT_THRESHOLD) {
    2611           0 :             newsize = TS_DVHS_PACKET_SIZE;
    2612           0 :         } else if (ts->size_stat[2] > SIZE_STAT_THRESHOLD) {
    2613           0 :             newsize = TS_FEC_PACKET_SIZE;
    2614             :         }
    2615           0 :         if (newsize && newsize != ts->raw_packet_size) {
    2616           0 :             av_log(ts->stream, AV_LOG_WARNING, "changing packet size to %d\n", newsize);
    2617           0 :             ts->raw_packet_size = newsize;
    2618             :         }
    2619           0 :         ts->size_stat_count = 0;
    2620           0 :         memset(ts->size_stat, 0, sizeof(ts->size_stat));
    2621             :     }
    2622             : }
    2623             : 
    2624             : /* XXX: try to find a better synchro over several packets (use
    2625             :  * get_packet_size() ?) */
    2626          45 : static int mpegts_resync(AVFormatContext *s, int seekback, const uint8_t *current_packet)
    2627             : {
    2628          45 :     MpegTSContext *ts = s->priv_data;
    2629          45 :     AVIOContext *pb = s->pb;
    2630             :     int c, i;
    2631          45 :     uint64_t pos = avio_tell(pb);
    2632             : 
    2633          45 :     avio_seek(pb, -FFMIN(seekback, pos), SEEK_CUR);
    2634             : 
    2635             :     //Special case for files like 01c56b0dc1.ts
    2636          45 :     if (current_packet[0] == 0x80 && current_packet[12] == 0x47) {
    2637           0 :         avio_seek(pb, 12, SEEK_CUR);
    2638           0 :         return 0;
    2639             :     }
    2640             : 
    2641        3127 :     for (i = 0; i < ts->resync_size; i++) {
    2642        3127 :         c = avio_r8(pb);
    2643        3127 :         if (avio_feof(pb))
    2644           0 :             return AVERROR_EOF;
    2645        3127 :         if (c == 0x47) {
    2646          45 :             avio_seek(pb, -1, SEEK_CUR);
    2647          45 :             reanalyze(s->priv_data);
    2648          45 :             return 0;
    2649             :         }
    2650             :     }
    2651           0 :     av_log(s, AV_LOG_ERROR,
    2652             :            "max resync size reached, could not find sync byte\n");
    2653             :     /* no sync found */
    2654           0 :     return AVERROR_INVALIDDATA;
    2655             : }
    2656             : 
    2657             : /* return AVERROR_something if error or EOF. Return 0 if OK. */
    2658      275306 : static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size,
    2659             :                        const uint8_t **data)
    2660             : {
    2661      275306 :     AVIOContext *pb = s->pb;
    2662             :     int len;
    2663             : 
    2664             :     for (;;) {
    2665      275396 :         len = ffio_read_indirect(pb, buf, TS_PACKET_SIZE, data);
    2666      275351 :         if (len != TS_PACKET_SIZE)
    2667         226 :             return len < 0 ? len : AVERROR_EOF;
    2668             :         /* check packet sync byte */
    2669      275125 :         if ((*data)[0] != 0x47) {
    2670             :             /* find a new packet start */
    2671             : 
    2672          45 :             if (mpegts_resync(s, raw_packet_size, *data) < 0)
    2673           0 :                 return AVERROR(EAGAIN);
    2674             :             else
    2675          45 :                 continue;
    2676             :         } else {
    2677      275080 :             break;
    2678             :         }
    2679             :     }
    2680      275080 :     return 0;
    2681             : }
    2682             : 
    2683      275080 : static void finished_reading_packet(AVFormatContext *s, int raw_packet_size)
    2684             : {
    2685      275080 :     AVIOContext *pb = s->pb;
    2686      275080 :     int skip = raw_packet_size - TS_PACKET_SIZE;
    2687      275080 :     if (skip > 0)
    2688           0 :         avio_skip(pb, skip);
    2689      275080 : }
    2690             : 
    2691       19983 : static int handle_packets(MpegTSContext *ts, int64_t nb_packets)
    2692             : {
    2693       19983 :     AVFormatContext *s = ts->stream;
    2694             :     uint8_t packet[TS_PACKET_SIZE + AV_INPUT_BUFFER_PADDING_SIZE];
    2695             :     const uint8_t *data;
    2696             :     int64_t packet_num;
    2697       19983 :     int ret = 0;
    2698             : 
    2699       19983 :     if (avio_tell(s->pb) != ts->last_pos) {
    2700             :         int i;
    2701         203 :         av_log(ts->stream, AV_LOG_TRACE, "Skipping after seek\n");
    2702             :         /* seek detected, flush pes buffer */
    2703     1663179 :         for (i = 0; i < NB_PID_MAX; i++) {
    2704     1662976 :             if (ts->pids[i]) {
    2705        1007 :                 if (ts->pids[i]->type == MPEGTS_PES) {
    2706         395 :                     PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
    2707         395 :                     av_buffer_unref(&pes->buffer);
    2708         395 :                     pes->data_index = 0;
    2709         395 :                     pes->state = MPEGTS_SKIP; /* skip until pes header */
    2710         612 :                 } else if (ts->pids[i]->type == MPEGTS_SECTION) {
    2711         612 :                     ts->pids[i]->u.section_filter.last_ver = -1;
    2712             :                 }
    2713        1007 :                 ts->pids[i]->last_cc = -1;
    2714        1007 :                 ts->pids[i]->last_pcr = -1;
    2715             :             }
    2716             :         }
    2717             :     }
    2718             : 
    2719       19983 :     ts->stop_parse = 0;
    2720       19983 :     packet_num = 0;
    2721       19983 :     memset(packet + TS_PACKET_SIZE, 0, AV_INPUT_BUFFER_PADDING_SIZE);
    2722             :     for (;;) {
    2723      570143 :         packet_num++;
    2724      590126 :         if (nb_packets != 0 && packet_num >= nb_packets ||
    2725      295063 :             ts->stop_parse > 1) {
    2726          33 :             ret = AVERROR(EAGAIN);
    2727          33 :             break;
    2728             :         }
    2729      295030 :         if (ts->stop_parse > 0)
    2730       19724 :             break;
    2731             : 
    2732      275306 :         ret = read_packet(s, packet, ts->raw_packet_size, &data);
    2733      275306 :         if (ret != 0)
    2734         226 :             break;
    2735      275080 :         ret = handle_packet(ts, data);
    2736      275080 :         finished_reading_packet(s, ts->raw_packet_size);
    2737      275080 :         if (ret != 0)
    2738           0 :             break;
    2739             :     }
    2740       19983 :     ts->last_pos = avio_tell(s->pb);
    2741       19983 :     return ret;
    2742             : }
    2743             : 
    2744        6217 : static int mpegts_probe(AVProbeData *p)
    2745             : {
    2746        6217 :     const int size = p->buf_size;
    2747        6217 :     int maxscore = 0;
    2748        6217 :     int sumscore = 0;
    2749             :     int i;
    2750        6217 :     int check_count = size / TS_FEC_PACKET_SIZE;
    2751             : #define CHECK_COUNT 10
    2752             : #define CHECK_BLOCK 100
    2753             : 
    2754        6217 :     if (!check_count)
    2755          11 :         return 0;
    2756             : 
    2757       17053 :     for (i = 0; i<check_count; i+=CHECK_BLOCK) {
    2758       10847 :         int left = FFMIN(check_count - i, CHECK_BLOCK);
    2759       10847 :         int score      = analyze(p->buf + TS_PACKET_SIZE     *i, TS_PACKET_SIZE     *left, TS_PACKET_SIZE     , 1);
    2760       10847 :         int dvhs_score = analyze(p->buf + TS_DVHS_PACKET_SIZE*i, TS_DVHS_PACKET_SIZE*left, TS_DVHS_PACKET_SIZE, 1);
    2761       10847 :         int fec_score  = analyze(p->buf + TS_FEC_PACKET_SIZE *i, TS_FEC_PACKET_SIZE *left, TS_FEC_PACKET_SIZE , 1);
    2762       10847 :         score = FFMAX3(score, dvhs_score, fec_score);
    2763       10847 :         sumscore += score;
    2764       10847 :         maxscore = FFMAX(maxscore, score);
    2765             :     }
    2766             : 
    2767        6206 :     sumscore = sumscore * CHECK_COUNT / check_count;
    2768        6206 :     maxscore = maxscore * CHECK_COUNT / CHECK_BLOCK;
    2769             : 
    2770             :     ff_dlog(0, "TS score: %d %d\n", sumscore, maxscore);
    2771             : 
    2772        6206 :     if        (check_count > CHECK_COUNT && sumscore > 6) {
    2773           0 :         return AVPROBE_SCORE_MAX   + sumscore - CHECK_COUNT;
    2774        6206 :     } else if (check_count >= CHECK_COUNT && sumscore > 6) {
    2775          32 :         return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
    2776        6174 :     } else if (check_count >= CHECK_COUNT && maxscore > 6) {
    2777           0 :         return AVPROBE_SCORE_MAX/2 + sumscore - CHECK_COUNT;
    2778        6174 :     } else if (sumscore > 6) {
    2779           1 :         return 2;
    2780             :     } else {
    2781        6173 :         return 0;
    2782             :     }
    2783             : }
    2784             : 
    2785             : /* return the 90kHz PCR and the extension for the 27MHz PCR. return
    2786             :  * (-1) if not available */
    2787       40585 : static int parse_pcr(int64_t *ppcr_high, int *ppcr_low, const uint8_t *packet)
    2788             : {
    2789             :     int afc, len, flags;
    2790             :     const uint8_t *p;
    2791             :     unsigned int v;
    2792             : 
    2793       40585 :     afc = (packet[3] >> 4) & 3;
    2794       40585 :     if (afc <= 1)
    2795           0 :         return AVERROR_INVALIDDATA;
    2796       40585 :     p   = packet + 4;
    2797       40585 :     len = p[0];
    2798       40585 :     p++;
    2799       40585 :     if (len == 0)
    2800          33 :         return AVERROR_INVALIDDATA;
    2801       40552 :     flags = *p++;
    2802       40552 :     len--;
    2803       40552 :     if (!(flags & 0x10))
    2804       21732 :         return AVERROR_INVALIDDATA;
    2805       18820 :     if (len < 6)
    2806           0 :         return AVERROR_INVALIDDATA;
    2807       18820 :     v          = AV_RB32(p);
    2808       18820 :     *ppcr_high = ((int64_t) v << 1) | (p[4] >> 7);
    2809       18820 :     *ppcr_low  = ((p[4] & 1) << 8) | p[5];
    2810       18820 :     return 0;
    2811             : }
    2812             : 
    2813          66 : static void seek_back(AVFormatContext *s, AVIOContext *pb, int64_t pos) {
    2814             : 
    2815             :     /* NOTE: We attempt to seek on non-seekable files as well, as the
    2816             :      * probe buffer usually is big enough. Only warn if the seek failed
    2817             :      * on files where the seek should work. */
    2818          66 :     if (avio_seek(pb, pos, SEEK_SET) < 0)
    2819           0 :         av_log(s, (pb->seekable & AVIO_SEEKABLE_NORMAL) ? AV_LOG_ERROR : AV_LOG_INFO, "Unable to seek back to the start\n");
    2820          66 : }
    2821             : 
    2822          33 : static int mpegts_read_header(AVFormatContext *s)
    2823             : {
    2824          33 :     MpegTSContext *ts = s->priv_data;
    2825          33 :     AVIOContext *pb   = s->pb;
    2826          33 :     uint8_t buf[8 * 1024] = {0};
    2827             :     int len;
    2828          33 :     int64_t pos, probesize = s->probesize;
    2829             : 
    2830          33 :     s->internal->prefer_codec_framerate = 1;
    2831             : 
    2832          33 :     if (ffio_ensure_seekback(pb, probesize) < 0)
    2833           0 :         av_log(s, AV_LOG_WARNING, "Failed to allocate buffers for seekback\n");
    2834             : 
    2835             :     /* read the first 8192 bytes to get packet size */
    2836          33 :     pos = avio_tell(pb);
    2837          33 :     len = avio_read(pb, buf, sizeof(buf));
    2838          33 :     ts->raw_packet_size = get_packet_size(buf, len);
    2839          33 :     if (ts->raw_packet_size <= 0) {
    2840           0 :         av_log(s, AV_LOG_WARNING, "Could not detect TS packet size, defaulting to non-FEC/DVHS\n");
    2841           0 :         ts->raw_packet_size = TS_PACKET_SIZE;
    2842             :     }
    2843          33 :     ts->stream     = s;
    2844          33 :     ts->auto_guess = 0;
    2845             : 
    2846          33 :     if (s->iformat == &ff_mpegts_demuxer) {
    2847             :         /* normal demux */
    2848             : 
    2849             :         /* first do a scan to get all the services */
    2850          33 :         seek_back(s, pb, pos);
    2851             : 
    2852          33 :         mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
    2853             : 
    2854          33 :         mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
    2855             : 
    2856          33 :         handle_packets(ts, probesize / ts->raw_packet_size);
    2857             :         /* if could not find service, enable auto_guess */
    2858             : 
    2859          33 :         ts->auto_guess = 1;
    2860             : 
    2861          33 :         av_log(ts->stream, AV_LOG_TRACE, "tuning done\n");
    2862             : 
    2863          33 :         s->ctx_flags |= AVFMTCTX_NOHEADER;
    2864             :     } else {
    2865             :         AVStream *st;
    2866             :         int pcr_pid, pid, nb_packets, nb_pcrs, ret, pcr_l;
    2867             :         int64_t pcrs[2], pcr_h;
    2868             :         int packet_count[2];
    2869             :         uint8_t packet[TS_PACKET_SIZE];
    2870             :         const uint8_t *data;
    2871             : 
    2872             :         /* only read packets */
    2873             : 
    2874           0 :         st = avformat_new_stream(s, NULL);
    2875           0 :         if (!st)
    2876           0 :             return AVERROR(ENOMEM);
    2877           0 :         avpriv_set_pts_info(st, 60, 1, 27000000);
    2878           0 :         st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
    2879           0 :         st->codecpar->codec_id   = AV_CODEC_ID_MPEG2TS;
    2880             : 
    2881             :         /* we iterate until we find two PCRs to estimate the bitrate */
    2882           0 :         pcr_pid    = -1;
    2883           0 :         nb_pcrs    = 0;
    2884           0 :         nb_packets = 0;
    2885             :         for (;;) {
    2886           0 :             ret = read_packet(s, packet, ts->raw_packet_size, &data);
    2887           0 :             if (ret < 0)
    2888           0 :                 return ret;
    2889           0 :             pid = AV_RB16(data + 1) & 0x1fff;
    2890           0 :             if ((pcr_pid == -1 || pcr_pid == pid) &&
    2891           0 :                 parse_pcr(&pcr_h, &pcr_l, data) == 0) {
    2892           0 :                 finished_reading_packet(s, ts->raw_packet_size);
    2893           0 :                 pcr_pid = pid;
    2894           0 :                 packet_count[nb_pcrs] = nb_packets;
    2895           0 :                 pcrs[nb_pcrs] = pcr_h * 300 + pcr_l;
    2896           0 :                 nb_pcrs++;
    2897           0 :                 if (nb_pcrs >= 2) {
    2898           0 :                     if (pcrs[1] - pcrs[0] > 0) {
    2899             :                         /* the difference needs to be positive to make sense for bitrate computation */
    2900           0 :                         break;
    2901             :                     } else {
    2902           0 :                         av_log(ts->stream, AV_LOG_WARNING, "invalid pcr pair %"PRId64" >= %"PRId64"\n", pcrs[0], pcrs[1]);
    2903           0 :                         pcrs[0] = pcrs[1];
    2904           0 :                         packet_count[0] = packet_count[1];
    2905           0 :                         nb_pcrs--;
    2906             :                     }
    2907             :                 }
    2908             :             } else {
    2909           0 :                 finished_reading_packet(s, ts->raw_packet_size);
    2910             :             }
    2911           0 :             nb_packets++;
    2912             :         }
    2913             : 
    2914             :         /* NOTE1: the bitrate is computed without the FEC */
    2915             :         /* NOTE2: it is only the bitrate of the start of the stream */
    2916           0 :         ts->pcr_incr = (pcrs[1] - pcrs[0]) / (packet_count[1] - packet_count[0]);
    2917           0 :         ts->cur_pcr  = pcrs[0] - ts->pcr_incr * packet_count[0];
    2918           0 :         s->bit_rate  = TS_PACKET_SIZE * 8 * 27000000LL / ts->pcr_incr;
    2919           0 :         st->codecpar->bit_rate = s->bit_rate;
    2920           0 :         st->start_time      = ts->cur_pcr;
    2921           0 :         av_log(ts->stream, AV_LOG_TRACE, "start=%0.3f pcr=%0.3f incr=%d\n",
    2922           0 :                 st->start_time / 1000000.0, pcrs[0] / 27e6, ts->pcr_incr);
    2923             :     }
    2924             : 
    2925          33 :     seek_back(s, pb, pos);
    2926          33 :     return 0;
    2927             : }
    2928             : 
    2929             : #define MAX_PACKET_READAHEAD ((128 * 1024) / 188)
    2930             : 
    2931           0 : static int mpegts_raw_read_packet(AVFormatContext *s, AVPacket *pkt)
    2932             : {
    2933           0 :     MpegTSContext *ts = s->priv_data;
    2934             :     int ret, i;
    2935             :     int64_t pcr_h, next_pcr_h, pos;
    2936             :     int pcr_l, next_pcr_l;
    2937             :     uint8_t pcr_buf[12];
    2938             :     const uint8_t *data;
    2939             : 
    2940           0 :     if (av_new_packet(pkt, TS_PACKET_SIZE) < 0)
    2941           0 :         return AVERROR(ENOMEM);
    2942           0 :     ret = read_packet(s, pkt->data, ts->raw_packet_size, &data);
    2943           0 :     pkt->pos = avio_tell(s->pb);
    2944           0 :     if (ret < 0) {
    2945           0 :         av_packet_unref(pkt);
    2946           0 :         return ret;
    2947             :     }
    2948           0 :     if (data != pkt->data)
    2949           0 :         memcpy(pkt->data, data, ts->raw_packet_size);
    2950           0 :     finished_reading_packet(s, ts->raw_packet_size);
    2951           0 :     if (ts->mpeg2ts_compute_pcr) {
    2952             :         /* compute exact PCR for each packet */
    2953           0 :         if (parse_pcr(&pcr_h, &pcr_l, pkt->data) == 0) {
    2954             :             /* we read the next PCR (XXX: optimize it by using a bigger buffer */
    2955           0 :             pos = avio_tell(s->pb);
    2956           0 :             for (i = 0; i < MAX_PACKET_READAHEAD; i++) {
    2957           0 :                 avio_seek(s->pb, pos + i * ts->raw_packet_size, SEEK_SET);
    2958           0 :                 avio_read(s->pb, pcr_buf, 12);
    2959           0 :                 if (parse_pcr(&next_pcr_h, &next_pcr_l, pcr_buf) == 0) {
    2960             :                     /* XXX: not precise enough */
    2961           0 :                     ts->pcr_incr =
    2962           0 :                         ((next_pcr_h - pcr_h) * 300 + (next_pcr_l - pcr_l)) /
    2963           0 :                         (i + 1);
    2964           0 :                     break;
    2965             :                 }
    2966             :             }
    2967           0 :             avio_seek(s->pb, pos, SEEK_SET);
    2968             :             /* no next PCR found: we use previous increment */
    2969           0 :             ts->cur_pcr = pcr_h * 300 + pcr_l;
    2970             :         }
    2971           0 :         pkt->pts      = ts->cur_pcr;
    2972           0 :         pkt->duration = ts->pcr_incr;
    2973           0 :         ts->cur_pcr  += ts->pcr_incr;
    2974             :     }
    2975           0 :     pkt->stream_index = 0;
    2976           0 :     return 0;
    2977             : }
    2978             : 
    2979       19950 : static int mpegts_read_packet(AVFormatContext *s, AVPacket *pkt)
    2980             : {
    2981       19950 :     MpegTSContext *ts = s->priv_data;
    2982             :     int ret, i;
    2983             : 
    2984       19950 :     pkt->size = -1;
    2985       19950 :     ts->pkt = pkt;
    2986       19950 :     ret = handle_packets(ts, 0);
    2987       19950 :     if (ret < 0) {
    2988         226 :         av_packet_unref(ts->pkt);
    2989             :         /* flush pes data left */
    2990     1314974 :         for (i = 0; i < NB_PID_MAX; i++)
    2991     1314842 :             if (ts->pids[i] && ts->pids[i]->type == MPEGTS_PES) {
    2992         439 :                 PESContext *pes = ts->pids[i]->u.pes_filter.opaque;
    2993         439 :                 if (pes->state == MPEGTS_PAYLOAD && pes->data_index > 0) {
    2994          94 :                     ret = new_pes_packet(pes, pkt);
    2995          94 :                     if (ret < 0)
    2996           0 :                         return ret;
    2997          94 :                     pes->state = MPEGTS_SKIP;
    2998          94 :                     ret = 0;
    2999          94 :                     break;
    3000             :                 }
    3001             :             }
    3002             :     }
    3003             : 
    3004       19950 :     if (!ret && pkt->size < 0)
    3005           0 :         ret = AVERROR_INVALIDDATA;
    3006       19950 :     return ret;
    3007             : }
    3008             : 
    3009          33 : static void mpegts_free(MpegTSContext *ts)
    3010             : {
    3011             :     int i;
    3012             : 
    3013          33 :     clear_programs(ts);
    3014             : 
    3015      270369 :     for (i = 0; i < NB_PID_MAX; i++)
    3016      270336 :         if (ts->pids[i])
    3017         171 :             mpegts_close_filter(ts, ts->pids[i]);
    3018          33 : }
    3019             : 
    3020          33 : static int mpegts_read_close(AVFormatContext *s)
    3021             : {
    3022          33 :     MpegTSContext *ts = s->priv_data;
    3023          33 :     mpegts_free(ts);
    3024          33 :     return 0;
    3025             : }
    3026             : 
    3027           0 : static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
    3028             :                               int64_t *ppos, int64_t pos_limit)
    3029             : {
    3030           0 :     MpegTSContext *ts = s->priv_data;
    3031             :     int64_t pos, timestamp;
    3032             :     uint8_t buf[TS_PACKET_SIZE];
    3033           0 :     int pcr_l, pcr_pid =
    3034           0 :         ((PESContext *)s->streams[stream_index]->priv_data)->pcr_pid;
    3035           0 :     int pos47 = ts->pos47_full % ts->raw_packet_size;
    3036           0 :     pos =
    3037           0 :         ((*ppos + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) *
    3038           0 :         ts->raw_packet_size + pos47;
    3039           0 :     while(pos < pos_limit) {
    3040           0 :         if (avio_seek(s->pb, pos, SEEK_SET) < 0)
    3041           0 :             return AV_NOPTS_VALUE;
    3042           0 :         if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
    3043           0 :             return AV_NOPTS_VALUE;
    3044           0 :         if (buf[0] != 0x47) {
    3045           0 :             if (mpegts_resync(s, TS_PACKET_SIZE, buf) < 0)
    3046           0 :                 return AV_NOPTS_VALUE;
    3047           0 :             pos = avio_tell(s->pb);
    3048           0 :             continue;
    3049             :         }
    3050           0 :         if ((pcr_pid < 0 || (AV_RB16(buf + 1) & 0x1fff) == pcr_pid) &&
    3051           0 :             parse_pcr(&timestamp, &pcr_l, buf) == 0) {
    3052           0 :             *ppos = pos;
    3053           0 :             return timestamp;
    3054             :         }
    3055           0 :         pos += ts->raw_packet_size;
    3056             :     }
    3057             : 
    3058           0 :     return AV_NOPTS_VALUE;
    3059             : }
    3060             : 
    3061          86 : static int64_t mpegts_get_dts(AVFormatContext *s, int stream_index,
    3062             :                               int64_t *ppos, int64_t pos_limit)
    3063             : {
    3064          86 :     MpegTSContext *ts = s->priv_data;
    3065             :     int64_t pos;
    3066          86 :     int pos47 = ts->pos47_full % ts->raw_packet_size;
    3067          86 :     pos = ((*ppos  + ts->raw_packet_size - 1 - pos47) / ts->raw_packet_size) * ts->raw_packet_size + pos47;
    3068          86 :     ff_read_frame_flush(s);
    3069          86 :     if (avio_seek(s->pb, pos, SEEK_SET) < 0)
    3070           0 :         return AV_NOPTS_VALUE;
    3071         578 :     while(pos < pos_limit) {
    3072             :         int ret;
    3073             :         AVPacket pkt;
    3074         480 :         av_init_packet(&pkt);
    3075         480 :         ret = av_read_frame(s, &pkt);
    3076         480 :         if (ret < 0)
    3077          92 :             return AV_NOPTS_VALUE;
    3078         462 :         if (pkt.dts != AV_NOPTS_VALUE && pkt.pos >= 0) {
    3079         159 :             ff_reduce_index(s, pkt.stream_index);
    3080         159 :             av_add_index_entry(s->streams[pkt.stream_index], pkt.pos, pkt.dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
    3081         159 :             if (pkt.stream_index == stream_index && pkt.pos >= *ppos) {
    3082          56 :                 int64_t dts = pkt.dts;
    3083          56 :                 *ppos = pkt.pos;
    3084          56 :                 av_packet_unref(&pkt);
    3085          56 :                 return dts;
    3086             :             }
    3087             :         }
    3088         406 :         pos = pkt.pos;
    3089         406 :         av_packet_unref(&pkt);
    3090             :     }
    3091             : 
    3092          12 :     return AV_NOPTS_VALUE;
    3093             : }
    3094             : 
    3095             : /**************************************************************/
    3096             : /* parsing functions - called from other demuxers such as RTP */
    3097             : 
    3098           0 : MpegTSContext *avpriv_mpegts_parse_open(AVFormatContext *s)
    3099             : {
    3100             :     MpegTSContext *ts;
    3101             : 
    3102           0 :     ts = av_mallocz(sizeof(MpegTSContext));
    3103           0 :     if (!ts)
    3104           0 :         return NULL;
    3105             :     /* no stream case, currently used by RTP */
    3106           0 :     ts->raw_packet_size = TS_PACKET_SIZE;
    3107           0 :     ts->stream = s;
    3108           0 :     ts->auto_guess = 1;
    3109           0 :     mpegts_open_section_filter(ts, SDT_PID, sdt_cb, ts, 1);
    3110           0 :     mpegts_open_section_filter(ts, PAT_PID, pat_cb, ts, 1);
    3111             : 
    3112           0 :     return ts;
    3113             : }
    3114             : 
    3115             : /* return the consumed length if a packet was output, or -1 if no
    3116             :  * packet is output */
    3117           0 : int avpriv_mpegts_parse_packet(MpegTSContext *ts, AVPacket *pkt,
    3118             :                                const uint8_t *buf, int len)
    3119             : {
    3120             :     int len1;
    3121             : 
    3122           0 :     len1 = len;
    3123           0 :     ts->pkt = pkt;
    3124             :     for (;;) {
    3125           0 :         ts->stop_parse = 0;
    3126           0 :         if (len < TS_PACKET_SIZE)
    3127           0 :             return AVERROR_INVALIDDATA;
    3128           0 :         if (buf[0] != 0x47) {
    3129           0 :             buf++;
    3130           0 :             len--;
    3131             :         } else {
    3132           0 :             handle_packet(ts, buf);
    3133           0 :             buf += TS_PACKET_SIZE;
    3134           0 :             len -= TS_PACKET_SIZE;
    3135           0 :             if (ts->stop_parse == 1)
    3136           0 :                 break;
    3137             :         }
    3138             :     }
    3139           0 :     return len1 - len;
    3140             : }
    3141             : 
    3142           0 : void avpriv_mpegts_parse_close(MpegTSContext *ts)
    3143             : {
    3144           0 :     mpegts_free(ts);
    3145           0 :     av_free(ts);
    3146           0 : }
    3147             : 
    3148             : AVInputFormat ff_mpegts_demuxer = {
    3149             :     .name           = "mpegts",
    3150             :     .long_name      = NULL_IF_CONFIG_SMALL("MPEG-TS (MPEG-2 Transport Stream)"),
    3151             :     .priv_data_size = sizeof(MpegTSContext),
    3152             :     .read_probe     = mpegts_probe,
    3153             :     .read_header    = mpegts_read_header,
    3154             :     .read_packet    = mpegts_read_packet,
    3155             :     .read_close     = mpegts_read_close,
    3156             :     .read_timestamp = mpegts_get_dts,
    3157             :     .flags          = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
    3158             :     .priv_class     = &mpegts_class,
    3159             : };
    3160             : 
    3161             : AVInputFormat ff_mpegtsraw_demuxer = {
    3162             :     .name           = "mpegtsraw",
    3163             :     .long_name      = NULL_IF_CONFIG_SMALL("raw MPEG-TS (MPEG-2 Transport Stream)"),
    3164             :     .priv_data_size = sizeof(MpegTSContext),
    3165             :     .read_header    = mpegts_read_header,
    3166             :     .read_packet    = mpegts_raw_read_packet,
    3167             :     .read_close     = mpegts_read_close,
    3168             :     .read_timestamp = mpegts_get_dts,
    3169             :     .flags          = AVFMT_SHOW_IDS | AVFMT_TS_DISCONT,
    3170             :     .priv_class     = &mpegtsraw_class,
    3171             : };

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