LCOV - code coverage report
Current view: top level - libavformat - wtvdec.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 464 641 72.4 %
Date: 2017-12-13 02:34:56 Functions: 21 24 87.5 %

          Line data    Source code
       1             : /*
       2             :  * Windows Television (WTV) demuxer
       3             :  * Copyright (c) 2010-2011 Peter Ross <pross@xvid.org>
       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             : /**
      23             :  * @file
      24             :  * Windows Television (WTV) demuxer
      25             :  * @author Peter Ross <pross@xvid.org>
      26             :  */
      27             : 
      28             : #include <inttypes.h>
      29             : 
      30             : #include "libavutil/channel_layout.h"
      31             : #include "libavutil/intreadwrite.h"
      32             : #include "libavutil/intfloat.h"
      33             : #include "libavutil/time_internal.h"
      34             : #include "avformat.h"
      35             : #include "internal.h"
      36             : #include "wtv.h"
      37             : #include "mpegts.h"
      38             : 
      39             : /* Macros for formatting GUIDs */
      40             : #define PRI_PRETTY_GUID \
      41             :     "%08"PRIx32"-%04"PRIx16"-%04"PRIx16"-%02x%02x%02x%02x%02x%02x%02x%02x"
      42             : #define ARG_PRETTY_GUID(g) \
      43             :     AV_RL32(g),AV_RL16(g+4),AV_RL16(g+6),g[8],g[9],g[10],g[11],g[12],g[13],g[14],g[15]
      44             : #define LEN_PRETTY_GUID 34
      45             : 
      46             : /*
      47             :  * File system routines
      48             :  */
      49             : 
      50             : typedef struct WtvFile {
      51             :     AVIOContext *pb_filesystem;  /**< file system (AVFormatContext->pb) */
      52             : 
      53             :     int sector_bits;     /**< sector shift bits; used to convert sector number into pb_filesystem offset */
      54             :     uint32_t *sectors;   /**< file allocation table */
      55             :     int nb_sectors;      /**< number of sectors */
      56             : 
      57             :     int error;
      58             :     int64_t position;
      59             :     int64_t length;
      60             : } WtvFile;
      61             : 
      62          86 : static int64_t seek_by_sector(AVIOContext *pb, int64_t sector, int64_t offset)
      63             : {
      64          86 :     return avio_seek(pb, (sector << WTV_SECTOR_BITS) + offset, SEEK_SET);
      65             : }
      66             : 
      67             : /**
      68             :  * @return bytes read, AVERROR_EOF on end of file, or <0 on error
      69             :  */
      70         252 : static int wtvfile_read_packet(void *opaque, uint8_t *buf, int buf_size)
      71             : {
      72         252 :     WtvFile *wf = opaque;
      73         252 :     AVIOContext *pb = wf->pb_filesystem;
      74         252 :     int nread = 0;
      75             : 
      76         252 :     if (wf->error || pb->error)
      77           0 :         return -1;
      78         252 :     if (wf->position >= wf->length || avio_feof(pb))
      79          51 :         return AVERROR_EOF;
      80             : 
      81         201 :     buf_size = FFMIN(buf_size, wf->length - wf->position);
      82         919 :     while(nread < buf_size) {
      83             :         int n;
      84         518 :         int remaining_in_sector = (1 << wf->sector_bits) - (wf->position & ((1 << wf->sector_bits) - 1));
      85         518 :         int read_request        = FFMIN(buf_size - nread, remaining_in_sector);
      86             : 
      87         518 :         n = avio_read(pb, buf, read_request);
      88         518 :         if (n <= 0)
      89           1 :             break;
      90         517 :         nread += n;
      91         517 :         buf += n;
      92         517 :         wf->position += n;
      93         517 :         if (n == remaining_in_sector) {
      94         329 :             int i = wf->position >> wf->sector_bits;
      95         658 :             if (i >= wf->nb_sectors ||
      96         331 :                 (wf->sectors[i] != wf->sectors[i - 1] + (1 << (wf->sector_bits - WTV_SECTOR_BITS)) &&
      97           2 :                 seek_by_sector(pb, wf->sectors[i], 0) < 0)) {
      98           0 :                 wf->error = 1;
      99           0 :                 break;
     100             :             }
     101             :         }
     102             :     }
     103         201 :     return nread;
     104             : }
     105             : 
     106             : /**
     107             :  * @return position (or file length)
     108             :  */
     109          57 : static int64_t wtvfile_seek(void *opaque, int64_t offset, int whence)
     110             : {
     111          57 :     WtvFile *wf = opaque;
     112          57 :     AVIOContext *pb = wf->pb_filesystem;
     113             : 
     114          57 :     if (whence == AVSEEK_SIZE)
     115           0 :         return wf->length;
     116          57 :     else if (whence == SEEK_CUR)
     117           0 :         offset = wf->position + offset;
     118          57 :     else if (whence == SEEK_END)
     119           0 :         offset = wf->length;
     120             : 
     121         114 :     wf->error = offset < 0 || offset >= wf->length ||
     122          57 :                 seek_by_sector(pb, wf->sectors[offset >> wf->sector_bits],
     123          57 :                                offset & ((1 << wf->sector_bits) - 1)) < 0;
     124          57 :     wf->position = offset;
     125          57 :     return offset;
     126             : }
     127             : 
     128             : /**
     129             :  * read non-zero integers (le32) from input stream
     130             :  * @param pb
     131             :  * @param[out] data destination
     132             :  * @param     count maximum number of integers to read
     133             :  * @return    total number of integers read
     134             :  */
     135           5 : static int read_ints(AVIOContext *pb, uint32_t *data, int count)
     136             : {
     137           5 :     int i, total = 0;
     138        5125 :     for (i = 0; i < count; i++) {
     139        5120 :         if ((data[total] = avio_rl32(pb)))
     140         411 :            total++;
     141             :     }
     142           5 :     return total;
     143             : }
     144             : 
     145             : /**
     146             :  * Open file
     147             :  * @param first_sector  First sector
     148             :  * @param length        Length of file (bytes)
     149             :  * @param depth         File allocation table depth
     150             :  * @return NULL on error
     151             :  */
     152          12 : static AVIOContext * wtvfile_open_sector(int first_sector, uint64_t length, int depth, AVFormatContext *s)
     153             : {
     154             :     AVIOContext *pb;
     155             :     WtvFile *wf;
     156             :     uint8_t *buffer;
     157             :     int64_t size;
     158             : 
     159          12 :     if (seek_by_sector(s->pb, first_sector, 0) < 0)
     160           0 :         return NULL;
     161             : 
     162          12 :     wf = av_mallocz(sizeof(WtvFile));
     163          12 :     if (!wf)
     164           0 :         return NULL;
     165             : 
     166          12 :     if (depth == 0) {
     167           7 :         wf->sectors = av_malloc(sizeof(uint32_t));
     168           7 :         if (!wf->sectors) {
     169           0 :             av_free(wf);
     170           0 :             return NULL;
     171             :         }
     172           7 :         wf->sectors[0]  = first_sector;
     173           7 :         wf->nb_sectors  = 1;
     174           5 :     } else if (depth == 1) {
     175           5 :         wf->sectors = av_malloc(WTV_SECTOR_SIZE);
     176           5 :         if (!wf->sectors) {
     177           0 :             av_free(wf);
     178           0 :             return NULL;
     179             :         }
     180           5 :         wf->nb_sectors  = read_ints(s->pb, wf->sectors, WTV_SECTOR_SIZE / 4);
     181           0 :     } else if (depth == 2) {
     182             :         uint32_t sectors1[WTV_SECTOR_SIZE / 4];
     183           0 :         int nb_sectors1 = read_ints(s->pb, sectors1, WTV_SECTOR_SIZE / 4);
     184             :         int i;
     185             : 
     186           0 :         wf->sectors = av_malloc_array(nb_sectors1, 1 << WTV_SECTOR_BITS);
     187           0 :         if (!wf->sectors) {
     188           0 :             av_free(wf);
     189           0 :             return NULL;
     190             :         }
     191           0 :         wf->nb_sectors = 0;
     192           0 :         for (i = 0; i < nb_sectors1; i++) {
     193           0 :             if (seek_by_sector(s->pb, sectors1[i], 0) < 0)
     194           0 :                 break;
     195           0 :             wf->nb_sectors += read_ints(s->pb, wf->sectors + i * WTV_SECTOR_SIZE / 4, WTV_SECTOR_SIZE / 4);
     196             :         }
     197             :     } else {
     198           0 :         av_log(s, AV_LOG_ERROR, "unsupported file allocation table depth (0x%x)\n", depth);
     199           0 :         av_free(wf);
     200           0 :         return NULL;
     201             :     }
     202          12 :     wf->sector_bits = length & (1ULL<<63) ? WTV_SECTOR_BITS : WTV_BIGSECTOR_BITS;
     203             : 
     204          12 :     if (!wf->nb_sectors) {
     205           0 :         av_freep(&wf->sectors);
     206           0 :         av_freep(&wf);
     207           0 :         return NULL;
     208             :     }
     209             : 
     210          12 :     size = avio_size(s->pb);
     211          12 :     if (size >= 0 && (int64_t)wf->sectors[wf->nb_sectors - 1] << WTV_SECTOR_BITS > size)
     212           1 :         av_log(s, AV_LOG_WARNING, "truncated file\n");
     213             : 
     214             :     /* check length */
     215          12 :     length &= 0xFFFFFFFFFFFF;
     216          12 :     if (length > ((int64_t)wf->nb_sectors << wf->sector_bits)) {
     217           0 :         av_log(s, AV_LOG_WARNING, "reported file length (0x%"PRIx64") exceeds number of available sectors (0x%"PRIx64")\n", length, (int64_t)wf->nb_sectors << wf->sector_bits);
     218           0 :         length = (int64_t)wf->nb_sectors <<  wf->sector_bits;
     219             :     }
     220          12 :     wf->length = length;
     221             : 
     222             :     /* seek to initial sector */
     223          12 :     wf->position = 0;
     224          12 :     if (seek_by_sector(s->pb, wf->sectors[0], 0) < 0) {
     225           0 :         av_freep(&wf->sectors);
     226           0 :         av_freep(&wf);
     227           0 :         return NULL;
     228             :     }
     229             : 
     230          12 :     wf->pb_filesystem = s->pb;
     231          12 :     buffer = av_malloc(1 << wf->sector_bits);
     232          12 :     if (!buffer) {
     233           0 :         av_freep(&wf->sectors);
     234           0 :         av_freep(&wf);
     235           0 :         return NULL;
     236             :     }
     237             : 
     238          12 :     pb = avio_alloc_context(buffer, 1 << wf->sector_bits, 0, wf,
     239             :                            wtvfile_read_packet, NULL, wtvfile_seek);
     240          12 :     if (!pb) {
     241           0 :         av_freep(&buffer);
     242           0 :         av_freep(&wf->sectors);
     243           0 :         av_freep(&wf);
     244             :     }
     245          12 :     return pb;
     246             : }
     247             : 
     248             : /**
     249             :  * Open file using filename
     250             :  * @param[in]  buf       directory buffer
     251             :  * @param      buf_size  directory buffer size
     252             :  * @param[in]  filename
     253             :  * @param      filename_size size of filename
     254             :  * @return NULL on error
     255             :  */
     256          12 : static AVIOContext * wtvfile_open2(AVFormatContext *s, const uint8_t *buf, int buf_size, const uint8_t *filename, int filename_size)
     257             : {
     258          12 :     const uint8_t *buf_end = buf + buf_size;
     259             : 
     260          66 :     while(buf + 48 <= buf_end) {
     261             :         int dir_length, name_size, first_sector, depth;
     262             :         uint64_t file_length;
     263             :         const uint8_t *name;
     264          54 :         if (ff_guidcmp(buf, ff_dir_entry_guid)) {
     265           0 :             av_log(s, AV_LOG_ERROR, "unknown guid "FF_PRI_GUID", expected dir_entry_guid; "
     266           0 :                    "remaining directory entries ignored\n", FF_ARG_GUID(buf));
     267           0 :             break;
     268             :         }
     269          54 :         dir_length  = AV_RL16(buf + 16);
     270          54 :         file_length = AV_RL64(buf + 24);
     271          54 :         name_size   = 2 * AV_RL32(buf + 32);
     272          54 :         if (name_size < 0) {
     273           0 :             av_log(s, AV_LOG_ERROR,
     274             :                    "bad filename length, remaining directory entries ignored\n");
     275           0 :             break;
     276             :         }
     277          54 :         if (48 + (int64_t)name_size > buf_end - buf) {
     278           0 :             av_log(s, AV_LOG_ERROR, "filename exceeds buffer size; remaining directory entries ignored\n");
     279           0 :             break;
     280             :         }
     281          54 :         first_sector = AV_RL32(buf + 40 + name_size);
     282          54 :         depth        = AV_RL32(buf + 44 + name_size);
     283             : 
     284             :         /* compare file name; test optional null terminator */
     285          54 :         name = buf + 40;
     286          99 :         if (name_size >= filename_size &&
     287          63 :             !memcmp(name, filename, filename_size) &&
     288          30 :             (name_size < filename_size + 2 || !AV_RN16(name + filename_size)))
     289          12 :             return wtvfile_open_sector(first_sector, file_length, depth, s);
     290             : 
     291          42 :         buf += dir_length;
     292             :     }
     293           0 :     return 0;
     294             : }
     295             : 
     296             : #define wtvfile_open(s, buf, buf_size, filename) \
     297             :     wtvfile_open2(s, buf, buf_size, filename, sizeof(filename))
     298             : 
     299             : /**
     300             :  * Close file opened with wtvfile_open_sector(), or wtv_open()
     301             :  */
     302          12 : static void wtvfile_close(AVIOContext *pb)
     303             : {
     304          12 :     WtvFile *wf = pb->opaque;
     305          12 :     av_freep(&wf->sectors);
     306          12 :     av_freep(&pb->opaque);
     307          12 :     av_freep(&pb->buffer);
     308          12 :     avio_context_free(&pb);
     309          12 : }
     310             : 
     311             : /*
     312             :  * Main demuxer
     313             :  */
     314             : 
     315             : typedef struct WtvStream {
     316             :     int seen_data;
     317             : } WtvStream;
     318             : 
     319             : typedef struct WtvContext {
     320             :     AVIOContext *pb;       /**< timeline file */
     321             :     int64_t epoch;
     322             :     int64_t pts;             /**< pts for next data chunk */
     323             :     int64_t last_valid_pts;  /**< latest valid pts, used for interactive seeking */
     324             : 
     325             :     /* maintain private seek index, as the AVIndexEntry->pos is relative to the
     326             :        start of the 'timeline' file, not the file system (AVFormatContext->pb) */
     327             :     AVIndexEntry *index_entries;
     328             :     int nb_index_entries;
     329             :     unsigned int index_entries_allocated_size;
     330             : } WtvContext;
     331             : 
     332             : /* WTV GUIDs */
     333             : static const ff_asf_guid EVENTID_SubtitleSpanningEvent =
     334             :     {0x48,0xC0,0xCE,0x5D,0xB9,0xD0,0x63,0x41,0x87,0x2C,0x4F,0x32,0x22,0x3B,0xE8,0x8A};
     335             : static const ff_asf_guid EVENTID_LanguageSpanningEvent =
     336             :     {0x6D,0x66,0x92,0xE2,0x02,0x9C,0x8D,0x44,0xAA,0x8D,0x78,0x1A,0x93,0xFD,0xC3,0x95};
     337             : static const ff_asf_guid EVENTID_AudioDescriptorSpanningEvent =
     338             :     {0x1C,0xD4,0x7B,0x10,0xDA,0xA6,0x91,0x46,0x83,0x69,0x11,0xB2,0xCD,0xAA,0x28,0x8E};
     339             : static const ff_asf_guid EVENTID_CtxADescriptorSpanningEvent =
     340             :     {0xE6,0xA2,0xB4,0x3A,0x47,0x42,0x34,0x4B,0x89,0x6C,0x30,0xAF,0xA5,0xD2,0x1C,0x24};
     341             : static const ff_asf_guid EVENTID_CSDescriptorSpanningEvent =
     342             :     {0xD9,0x79,0xE7,0xEf,0xF0,0x97,0x86,0x47,0x80,0x0D,0x95,0xCF,0x50,0x5D,0xDC,0x66};
     343             : static const ff_asf_guid EVENTID_DVBScramblingControlSpanningEvent =
     344             :     {0xC4,0xE1,0xD4,0x4B,0xA1,0x90,0x09,0x41,0x82,0x36,0x27,0xF0,0x0E,0x7D,0xCC,0x5B};
     345             : static const ff_asf_guid EVENTID_StreamIDSpanningEvent =
     346             :     {0x68,0xAB,0xF1,0xCA,0x53,0xE1,0x41,0x4D,0xA6,0xB3,0xA7,0xC9,0x98,0xDB,0x75,0xEE};
     347             : static const ff_asf_guid EVENTID_TeletextSpanningEvent =
     348             :     {0x50,0xD9,0x99,0x95,0x33,0x5F,0x17,0x46,0xAF,0x7C,0x1E,0x54,0xB5,0x10,0xDA,0xA3};
     349             : static const ff_asf_guid EVENTID_AudioTypeSpanningEvent =
     350             :     {0xBE,0xBF,0x1C,0x50,0x49,0xB8,0xCE,0x42,0x9B,0xE9,0x3D,0xB8,0x69,0xFB,0x82,0xB3};
     351             : 
     352             : /* Windows media GUIDs */
     353             : 
     354             : /* Media types */
     355             : static const ff_asf_guid mediasubtype_mpeg1payload =
     356             :     {0x81,0xEB,0x36,0xE4,0x4F,0x52,0xCE,0x11,0x9F,0x53,0x00,0x20,0xAF,0x0B,0xA7,0x70};
     357             : static const ff_asf_guid mediatype_mpeg2_sections =
     358             :     {0x6C,0x17,0x5F,0x45,0x06,0x4B,0xCE,0x47,0x9A,0xEF,0x8C,0xAE,0xF7,0x3D,0xF7,0xB5};
     359             : static const ff_asf_guid mediatype_mpeg2_pes =
     360             :     {0x20,0x80,0x6D,0xE0,0x46,0xDB,0xCF,0x11,0xB4,0xD1,0x00,0x80,0x5F,0x6C,0xBB,0xEA};
     361             : static const ff_asf_guid mediatype_mstvcaption =
     362             :     {0x89,0x8A,0x8B,0xB8,0x49,0xB0,0x80,0x4C,0xAD,0xCF,0x58,0x98,0x98,0x5E,0x22,0xC1};
     363             : 
     364             : /* Media subtypes */
     365             : static const ff_asf_guid mediasubtype_dvb_subtitle =
     366             :     {0xC3,0xCB,0xFF,0x34,0xB3,0xD5,0x71,0x41,0x90,0x02,0xD4,0xC6,0x03,0x01,0x69,0x7F};
     367             : static const ff_asf_guid mediasubtype_teletext =
     368             :     {0xE3,0x76,0x2A,0xF7,0x0A,0xEB,0xD0,0x11,0xAC,0xE4,0x00,0x00,0xC0,0xCC,0x16,0xBA};
     369             : static const ff_asf_guid mediasubtype_dtvccdata =
     370             :     {0xAA,0xDD,0x2A,0xF5,0xF0,0x36,0xF5,0x43,0x95,0xEA,0x6D,0x86,0x64,0x84,0x26,0x2A};
     371             : static const ff_asf_guid mediasubtype_mpeg2_sections =
     372             :     {0x79,0x85,0x9F,0x4A,0xF8,0x6B,0x92,0x43,0x8A,0x6D,0xD2,0xDD,0x09,0xFA,0x78,0x61};
     373             : 
     374        6130 : static int read_probe(AVProbeData *p)
     375             : {
     376        6130 :     return ff_guidcmp(p->buf, ff_wtv_guid) ? 0 : AVPROBE_SCORE_MAX;
     377             : }
     378             : 
     379             : /**
     380             :  * Convert win32 FILETIME to ISO-8601 string
     381             :  * @return <0 on error
     382             :  */
     383           0 : static int filetime_to_iso8601(char *buf, int buf_size, int64_t value)
     384             : {
     385           0 :     time_t t = (value / 10000000LL) - 11644473600LL;
     386             :     struct tm tmbuf;
     387           0 :     struct tm *tm = gmtime_r(&t, &tmbuf);
     388           0 :     if (!tm)
     389           0 :         return -1;
     390           0 :     if (!strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", tm))
     391           0 :         return -1;
     392           0 :     return 0;
     393             : }
     394             : 
     395             : /**
     396             :  * Convert crazy time (100ns since 1 Jan 0001) to ISO-8601 string
     397             :  * @return <0 on error
     398             :  */
     399           2 : static int crazytime_to_iso8601(char *buf, int buf_size, int64_t value)
     400             : {
     401           2 :     time_t t = (value / 10000000LL) - 719162LL*86400LL;
     402             :     struct tm tmbuf;
     403           2 :     struct tm *tm = gmtime_r(&t, &tmbuf);
     404           2 :     if (!tm)
     405           0 :         return -1;
     406           2 :     if (!strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", tm))
     407           0 :         return -1;
     408           2 :     return 0;
     409             : }
     410             : 
     411             : /**
     412             :  * Convert OLE DATE to ISO-8601 string
     413             :  * @return <0 on error
     414             :  */
     415           1 : static int oledate_to_iso8601(char *buf, int buf_size, int64_t value)
     416             : {
     417           1 :     time_t t = (av_int2double(value) - 25569.0) * 86400;
     418             :     struct tm tmbuf;
     419           1 :     struct tm *tm= gmtime_r(&t, &tmbuf);
     420           1 :     if (!tm)
     421           0 :         return -1;
     422           1 :     if (!strftime(buf, buf_size, "%Y-%m-%d %H:%M:%S", tm))
     423           0 :         return -1;
     424           1 :     return 0;
     425             : }
     426             : 
     427           1 : static void get_attachment(AVFormatContext *s, AVIOContext *pb, int length)
     428             : {
     429             :     char mime[1024];
     430             :     char description[1024];
     431             :     unsigned int filesize;
     432             :     AVStream *st;
     433             :     int ret;
     434           1 :     int64_t pos = avio_tell(pb);
     435             : 
     436           1 :     avio_get_str16le(pb, INT_MAX, mime, sizeof(mime));
     437           1 :     if (strcmp(mime, "image/jpeg"))
     438           0 :         goto done;
     439             : 
     440           1 :     avio_r8(pb);
     441           1 :     avio_get_str16le(pb, INT_MAX, description, sizeof(description));
     442           1 :     filesize = avio_rl32(pb);
     443           1 :     if (!filesize)
     444           0 :         goto done;
     445             : 
     446           1 :     st = avformat_new_stream(s, NULL);
     447           1 :     if (!st)
     448           0 :         goto done;
     449           1 :     av_dict_set(&st->metadata, "title", description, 0);
     450           1 :     st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
     451           1 :     st->codecpar->codec_id   = AV_CODEC_ID_MJPEG;
     452           1 :     st->id = -1;
     453           1 :     ret = av_get_packet(pb, &st->attached_pic, filesize);
     454           1 :     if (ret < 0)
     455           0 :         goto done;
     456           1 :     st->attached_pic.stream_index = st->index;
     457           1 :     st->attached_pic.flags       |= AV_PKT_FLAG_KEY;
     458           1 :     st->disposition              |= AV_DISPOSITION_ATTACHED_PIC;
     459           1 : done:
     460           1 :     avio_seek(pb, pos + length, SEEK_SET);
     461           1 : }
     462             : 
     463          73 : static void get_tag(AVFormatContext *s, AVIOContext *pb, const char *key, int type, int length)
     464             : {
     465             :     int buf_size;
     466             :     char *buf;
     467             : 
     468          73 :     if (!strcmp(key, "WM/MediaThumbType")) {
     469           1 :         avio_skip(pb, length);
     470           1 :         return;
     471             :     }
     472             : 
     473          72 :     buf_size = FFMAX(2*length, LEN_PRETTY_GUID) + 1;
     474          72 :     buf = av_malloc(buf_size);
     475          72 :     if (!buf)
     476           0 :         return;
     477             : 
     478          72 :     if (type == 0 && length == 4) {
     479          23 :         snprintf(buf, buf_size, "%u", avio_rl32(pb));
     480          49 :     } else if (type == 1) {
     481          23 :         avio_get_str16le(pb, length, buf, buf_size);
     482          23 :         if (!strlen(buf)) {
     483           6 :            av_free(buf);
     484           6 :            return;
     485             :         }
     486          26 :     } else if (type == 3 && length == 4) {
     487          17 :         strcpy(buf, avio_rl32(pb) ? "true" : "false");
     488          15 :     } else if (type == 4 && length == 8) {
     489           6 :         int64_t num = avio_rl64(pb);
     490          12 :         if (!strcmp(key, "WM/EncodingTime") ||
     491           6 :             !strcmp(key, "WM/MediaOriginalBroadcastDateTime")) {
     492           0 :             if (filetime_to_iso8601(buf, buf_size, num) < 0) {
     493           0 :                 av_free(buf);
     494           0 :                 return;
     495             :             }
     496          11 :         } else if (!strcmp(key, "WM/WMRVEncodeTime") ||
     497           5 :                    !strcmp(key, "WM/WMRVEndTime")) {
     498           4 :             if (crazytime_to_iso8601(buf, buf_size, num) < 0) {
     499           0 :                 av_free(buf);
     500           0 :                 return;
     501             :             }
     502           4 :         } else if (!strcmp(key, "WM/WMRVExpirationDate")) {
     503           1 :             if (oledate_to_iso8601(buf, buf_size, num) < 0 ) {
     504           0 :                 av_free(buf);
     505           0 :                 return;
     506             :             }
     507           3 :         } else if (!strcmp(key, "WM/WMRVBitrate"))
     508           1 :             snprintf(buf, buf_size, "%f", av_int2double(num));
     509             :         else
     510           2 :             snprintf(buf, buf_size, "%"PRIi64, num);
     511           3 :     } else if (type == 5 && length == 2) {
     512           0 :         snprintf(buf, buf_size, "%u", avio_rl16(pb));
     513           5 :     } else if (type == 6 && length == 16) {
     514             :         ff_asf_guid guid;
     515           2 :         avio_read(pb, guid, 16);
     516           2 :         snprintf(buf, buf_size, PRI_PRETTY_GUID, ARG_PRETTY_GUID(guid));
     517           1 :     } else if (type == 2 && !strcmp(key, "WM/Picture")) {
     518           1 :         get_attachment(s, pb, length);
     519           1 :         av_freep(&buf);
     520           1 :         return;
     521             :     } else {
     522           0 :         av_freep(&buf);
     523           0 :         av_log(s, AV_LOG_WARNING, "unsupported metadata entry; key:%s, type:%d, length:0x%x\n", key, type, length);
     524           0 :         avio_skip(pb, length);
     525           0 :         return;
     526             :     }
     527             : 
     528          65 :     av_dict_set(&s->metadata, key, buf, 0);
     529          65 :     av_freep(&buf);
     530             : }
     531             : 
     532             : /**
     533             :  * Parse metadata entries
     534             :  */
     535           3 : static void parse_legacy_attrib(AVFormatContext *s, AVIOContext *pb)
     536             : {
     537             :     ff_asf_guid guid;
     538             :     int length, type;
     539          79 :     while(!avio_feof(pb)) {
     540             :         char key[1024];
     541          76 :         ff_get_guid(pb, &guid);
     542          76 :         type   = avio_rl32(pb);
     543          76 :         length = avio_rl32(pb);
     544          76 :         if (!length)
     545           6 :             break;
     546          73 :         if (ff_guidcmp(&guid, ff_metadata_guid)) {
     547           0 :             av_log(s, AV_LOG_WARNING, "unknown guid "FF_PRI_GUID", expected metadata_guid; "
     548           0 :                    "remaining metadata entries ignored\n", FF_ARG_GUID(guid));
     549           0 :             break;
     550             :         }
     551          73 :         avio_get_str16le(pb, INT_MAX, key, sizeof(key));
     552          73 :         get_tag(s, pb, key, type, length);
     553             :     }
     554             : 
     555           3 :     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
     556           3 : }
     557             : 
     558             : /**
     559             :  * parse VIDEOINFOHEADER2 structure
     560             :  * @return bytes consumed
     561             :  */
     562           4 : static int parse_videoinfoheader2(AVFormatContext *s, AVStream *st)
     563             : {
     564           4 :     WtvContext *wtv = s->priv_data;
     565           4 :     AVIOContext *pb = wtv->pb;
     566             : 
     567           4 :     avio_skip(pb, 72);  // picture aspect ratio is unreliable
     568           4 :     st->codecpar->codec_tag = ff_get_bmp_header(pb, st, NULL);
     569             : 
     570           4 :     return 72 + 40;
     571             : }
     572             : 
     573             : /**
     574             :  * Parse MPEG1WAVEFORMATEX extradata structure
     575             :  */
     576           0 : static void parse_mpeg1waveformatex(AVStream *st)
     577             : {
     578             :     /* fwHeadLayer */
     579           0 :     switch (AV_RL16(st->codecpar->extradata)) {
     580           0 :     case 0x0001 : st->codecpar->codec_id = AV_CODEC_ID_MP1; break;
     581           0 :     case 0x0002 : st->codecpar->codec_id = AV_CODEC_ID_MP2; break;
     582           0 :     case 0x0004 : st->codecpar->codec_id = AV_CODEC_ID_MP3; break;
     583             :     }
     584             : 
     585           0 :     st->codecpar->bit_rate = AV_RL32(st->codecpar->extradata + 2); /* dwHeadBitrate */
     586             : 
     587             :     /* dwHeadMode */
     588           0 :     switch (AV_RL16(st->codecpar->extradata + 6)) {
     589           0 :     case 1 :
     590             :     case 2 :
     591           0 :     case 4 : st->codecpar->channels       = 2;
     592           0 :              st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
     593           0 :              break;
     594           0 :     case 8 : st->codecpar->channels       = 1;
     595           0 :              st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
     596           0 :              break;
     597             :     }
     598           0 : }
     599             : 
     600             : /**
     601             :  * Initialise stream
     602             :  * @param st Stream to initialise, or NULL to create and initialise new stream
     603             :  * @return NULL on error
     604             :  */
     605          12 : static AVStream * new_stream(AVFormatContext *s, AVStream *st, int sid, int codec_type)
     606             : {
     607          12 :     if (st) {
     608           4 :         if (st->codecpar->extradata) {
     609           2 :             av_freep(&st->codecpar->extradata);
     610           2 :             st->codecpar->extradata_size = 0;
     611             :         }
     612             :     } else {
     613           8 :         WtvStream *wst = av_mallocz(sizeof(WtvStream));
     614           8 :         if (!wst)
     615           0 :             return NULL;
     616           8 :         st = avformat_new_stream(s, NULL);
     617           8 :         if (!st) {
     618           0 :             av_free(wst);
     619           0 :             return NULL;
     620             :         }
     621           8 :         st->id = sid;
     622           8 :         st->priv_data = wst;
     623             :     }
     624          12 :     st->codecpar->codec_type = codec_type;
     625          12 :     st->need_parsing      = AVSTREAM_PARSE_FULL;
     626          12 :     avpriv_set_pts_info(st, 64, 1, 10000000);
     627          12 :     return st;
     628             : }
     629             : 
     630             : /**
     631             :  * parse Media Type structure and populate stream
     632             :  * @param st         Stream, or NULL to create new stream
     633             :  * @param mediatype  Mediatype GUID
     634             :  * @param subtype    Subtype GUID
     635             :  * @param formattype Format GUID
     636             :  * @param size       Size of format buffer
     637             :  * @return NULL on error
     638             :  */
     639          22 : static AVStream * parse_media_type(AVFormatContext *s, AVStream *st, int sid,
     640             :                                    ff_asf_guid mediatype, ff_asf_guid subtype,
     641             :                                    ff_asf_guid formattype, uint64_t size)
     642             : {
     643          22 :     WtvContext *wtv = s->priv_data;
     644          22 :     AVIOContext *pb = wtv->pb;
     645          32 :     if (!ff_guidcmp(subtype, ff_mediasubtype_cpfilters_processed) &&
     646          10 :         !ff_guidcmp(formattype, ff_format_cpfilters_processed)) {
     647             :         ff_asf_guid actual_subtype;
     648             :         ff_asf_guid actual_formattype;
     649             : 
     650          10 :         if (size < 32) {
     651           0 :             av_log(s, AV_LOG_WARNING, "format buffer size underflow\n");
     652           0 :             avio_skip(pb, size);
     653           0 :             return NULL;
     654             :         }
     655             : 
     656          10 :         avio_skip(pb, size - 32);
     657          10 :         ff_get_guid(pb, &actual_subtype);
     658          10 :         ff_get_guid(pb, &actual_formattype);
     659          10 :         avio_seek(pb, -size, SEEK_CUR);
     660             : 
     661          10 :         st = parse_media_type(s, st, sid, mediatype, actual_subtype, actual_formattype, size - 32);
     662          10 :         avio_skip(pb, 32);
     663          10 :         return st;
     664          12 :     } else if (!ff_guidcmp(mediatype, ff_mediatype_audio)) {
     665           6 :         st = new_stream(s, st, sid, AVMEDIA_TYPE_AUDIO);
     666           6 :         if (!st)
     667           0 :             return NULL;
     668           6 :         if (!ff_guidcmp(formattype, ff_format_waveformatex)) {
     669           6 :             int ret = ff_get_wav_header(s, pb, st->codecpar, size, 0);
     670           6 :             if (ret < 0)
     671           0 :                 return NULL;
     672             :         } else {
     673           0 :             if (ff_guidcmp(formattype, ff_format_none))
     674           0 :                 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
     675           0 :             avio_skip(pb, size);
     676             :         }
     677             : 
     678           6 :         if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
     679           0 :             st->codecpar->codec_id = ff_wav_codec_get_id(AV_RL32(subtype), st->codecpar->bits_per_coded_sample);
     680           6 :         } else if (!ff_guidcmp(subtype, mediasubtype_mpeg1payload)) {
     681           0 :             if (st->codecpar->extradata && st->codecpar->extradata_size >= 22)
     682           0 :                 parse_mpeg1waveformatex(st);
     683             :             else
     684           0 :                 av_log(s, AV_LOG_WARNING, "MPEG1WAVEFORMATEX underflow\n");
     685             :         } else {
     686           6 :             st->codecpar->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subtype);
     687           6 :             if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
     688           0 :                 av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
     689             :         }
     690           6 :         return st;
     691           6 :     } else if (!ff_guidcmp(mediatype, ff_mediatype_video)) {
     692           4 :         st = new_stream(s, st, sid, AVMEDIA_TYPE_VIDEO);
     693           4 :         if (!st)
     694           0 :             return NULL;
     695           4 :         if (!ff_guidcmp(formattype, ff_format_videoinfo2)) {
     696           0 :             int consumed = parse_videoinfoheader2(s, st);
     697           0 :             avio_skip(pb, FFMAX(size - consumed, 0));
     698           4 :         } else if (!ff_guidcmp(formattype, ff_format_mpeg2_video)) {
     699           4 :             uint64_t consumed = parse_videoinfoheader2(s, st);
     700             :             /* ignore extradata; files produced by windows media center contain meaningless mpeg1 sequence header */
     701           4 :             avio_skip(pb, FFMAX(size - consumed, 0));
     702             :         } else {
     703           0 :             if (ff_guidcmp(formattype, ff_format_none))
     704           0 :                 av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
     705           0 :             avio_skip(pb, size);
     706             :         }
     707             : 
     708           4 :         if (!memcmp(subtype + 4, (const uint8_t[]){FF_MEDIASUBTYPE_BASE_GUID}, 12)) {
     709           0 :             st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags, AV_RL32(subtype));
     710             :         } else {
     711           4 :             st->codecpar->codec_id = ff_codec_guid_get_id(ff_video_guids, subtype);
     712             :         }
     713           4 :         if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
     714           0 :             av_log(s, AV_LOG_WARNING, "unknown subtype:"FF_PRI_GUID"\n", FF_ARG_GUID(subtype));
     715           4 :         return st;
     716           4 :     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_pes) &&
     717           2 :                !ff_guidcmp(subtype, mediasubtype_dvb_subtitle)) {
     718           2 :         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
     719           2 :         if (!st)
     720           0 :             return NULL;
     721           2 :         if (ff_guidcmp(formattype, ff_format_none))
     722           0 :             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
     723           2 :         avio_skip(pb, size);
     724           2 :         st->codecpar->codec_id = AV_CODEC_ID_DVB_SUBTITLE;
     725           2 :         return st;
     726           0 :     } else if (!ff_guidcmp(mediatype, mediatype_mstvcaption) &&
     727           0 :                (!ff_guidcmp(subtype, mediasubtype_teletext) || !ff_guidcmp(subtype, mediasubtype_dtvccdata))) {
     728           0 :         st = new_stream(s, st, sid, AVMEDIA_TYPE_SUBTITLE);
     729           0 :         if (!st)
     730           0 :             return NULL;
     731           0 :         if (ff_guidcmp(formattype, ff_format_none))
     732           0 :             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
     733           0 :         avio_skip(pb, size);
     734           0 :         st->codecpar->codec_id = !ff_guidcmp(subtype, mediasubtype_teletext) ? AV_CODEC_ID_DVB_TELETEXT : AV_CODEC_ID_EIA_608;
     735           0 :         return st;
     736           0 :     } else if (!ff_guidcmp(mediatype, mediatype_mpeg2_sections) &&
     737           0 :                !ff_guidcmp(subtype, mediasubtype_mpeg2_sections)) {
     738           0 :         if (ff_guidcmp(formattype, ff_format_none))
     739           0 :             av_log(s, AV_LOG_WARNING, "unknown formattype:"FF_PRI_GUID"\n", FF_ARG_GUID(formattype));
     740           0 :         avio_skip(pb, size);
     741           0 :         return NULL;
     742             :     }
     743             : 
     744           0 :     av_log(s, AV_LOG_WARNING, "unknown media type, mediatype:"FF_PRI_GUID
     745             :                               ", subtype:"FF_PRI_GUID", formattype:"FF_PRI_GUID"\n",
     746           0 :                               FF_ARG_GUID(mediatype), FF_ARG_GUID(subtype), FF_ARG_GUID(formattype));
     747           0 :     avio_skip(pb, size);
     748           0 :     return NULL;
     749             : }
     750             : 
     751             : enum {
     752             :     SEEK_TO_DATA = 0,
     753             :     SEEK_TO_PTS,
     754             : };
     755             : 
     756             : /**
     757             :  * Try to seek over a broken chunk
     758             :  * @return <0 on error
     759             :  */
     760           0 : static int recover(WtvContext *wtv, uint64_t broken_pos)
     761             : {
     762           0 :     AVIOContext *pb = wtv->pb;
     763             :     int i;
     764           0 :     for (i = 0; i < wtv->nb_index_entries; i++) {
     765           0 :         if (wtv->index_entries[i].pos > broken_pos) {
     766           0 :             int64_t ret = avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET);
     767           0 :             if (ret < 0)
     768           0 :                 return ret;
     769           0 :             wtv->pts = wtv->index_entries[i].timestamp;
     770           0 :             return 0;
     771             :          }
     772             :      }
     773           0 :      return AVERROR(EIO);
     774             : }
     775             : 
     776             : /**
     777             :  * Parse WTV chunks
     778             :  * @param mode SEEK_TO_DATA or SEEK_TO_PTS
     779             :  * @param seekts timestamp
     780             :  * @param[out] len_ptr Length of data chunk
     781             :  * @return stream index of data chunk, or <0 on error
     782             :  */
     783         322 : static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_ptr)
     784             : {
     785         322 :     WtvContext *wtv = s->priv_data;
     786         322 :     AVIOContext *pb = wtv->pb;
     787        1792 :     while (!avio_feof(pb)) {
     788             :         ff_asf_guid g;
     789             :         int len, sid, consumed;
     790             : 
     791        1458 :         ff_get_guid(pb, &g);
     792        1458 :         len = avio_rl32(pb);
     793        1458 :         if (len < 32) {
     794             :             int ret;
     795           7 :             if (avio_feof(pb))
     796         317 :                 return AVERROR_EOF;
     797           0 :             av_log(s, AV_LOG_WARNING, "encountered broken chunk\n");
     798           0 :             if ((ret = recover(wtv, avio_tell(pb) - 20)) < 0)
     799           0 :                 return ret;
     800           0 :             continue;
     801             :         }
     802        1451 :         sid = avio_rl32(pb) & 0x7FFF;
     803        1451 :         avio_skip(pb, 8);
     804        1451 :         consumed = 32;
     805             : 
     806        1451 :         if (!ff_guidcmp(g, ff_SBE2_STREAM_DESC_EVENT)) {
     807          34 :             if (ff_find_stream_index(s, sid) < 0) {
     808             :                 ff_asf_guid mediatype, subtype, formattype;
     809             :                 int size;
     810           8 :                 avio_skip(pb, 28);
     811           8 :                 ff_get_guid(pb, &mediatype);
     812           8 :                 ff_get_guid(pb, &subtype);
     813           8 :                 avio_skip(pb, 12);
     814           8 :                 ff_get_guid(pb, &formattype);
     815           8 :                 size = avio_rl32(pb);
     816           8 :                 parse_media_type(s, 0, sid, mediatype, subtype, formattype, size);
     817           8 :                 consumed += 92 + size;
     818             :             }
     819        1417 :         } else if (!ff_guidcmp(g, ff_stream2_guid)) {
     820          28 :             int stream_index = ff_find_stream_index(s, sid);
     821          28 :             if (stream_index >= 0 && s->streams[stream_index]->priv_data && !((WtvStream*)s->streams[stream_index]->priv_data)->seen_data) {
     822             :                 ff_asf_guid mediatype, subtype, formattype;
     823             :                 int size;
     824           4 :                 avio_skip(pb, 12);
     825           4 :                 ff_get_guid(pb, &mediatype);
     826           4 :                 ff_get_guid(pb, &subtype);
     827           4 :                 avio_skip(pb, 12);
     828           4 :                 ff_get_guid(pb, &formattype);
     829           4 :                 size = avio_rl32(pb);
     830           4 :                 parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size);
     831           4 :                 consumed += 76 + size;
     832             :             }
     833        2778 :         } else if (!ff_guidcmp(g, EVENTID_AudioDescriptorSpanningEvent) ||
     834        2778 :                    !ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
     835        2778 :                    !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent) ||
     836        2775 :                    !ff_guidcmp(g, EVENTID_StreamIDSpanningEvent) ||
     837        2771 :                    !ff_guidcmp(g, EVENTID_SubtitleSpanningEvent) ||
     838        1389 :                    !ff_guidcmp(g, EVENTID_TeletextSpanningEvent)) {
     839           4 :             int stream_index = ff_find_stream_index(s, sid);
     840           4 :             if (stream_index >= 0) {
     841           4 :                 AVStream *st = s->streams[stream_index];
     842             :                 uint8_t buf[258];
     843           4 :                 const uint8_t *pbuf = buf;
     844             :                 int buf_size;
     845             : 
     846           4 :                 avio_skip(pb, 8);
     847           4 :                 consumed += 8;
     848           8 :                 if (!ff_guidcmp(g, EVENTID_CtxADescriptorSpanningEvent) ||
     849           4 :                     !ff_guidcmp(g, EVENTID_CSDescriptorSpanningEvent)) {
     850           0 :                     avio_skip(pb, 6);
     851           0 :                     consumed += 6;
     852             :                 }
     853             : 
     854           4 :                 buf_size = FFMIN(len - consumed, sizeof(buf));
     855           4 :                 avio_read(pb, buf, buf_size);
     856           4 :                 consumed += buf_size;
     857           4 :                 ff_parse_mpeg2_descriptor(s, st, 0, &pbuf, buf + buf_size, NULL, 0, 0, NULL);
     858             :             }
     859        1385 :         } else if (!ff_guidcmp(g, EVENTID_AudioTypeSpanningEvent)) {
     860           2 :             int stream_index = ff_find_stream_index(s, sid);
     861           2 :             if (stream_index >= 0) {
     862           2 :                 AVStream *st = s->streams[stream_index];
     863             :                 int audio_type;
     864           2 :                 avio_skip(pb, 8);
     865           2 :                 audio_type = avio_r8(pb);
     866           2 :                 if (audio_type == 2)
     867           1 :                     st->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
     868           1 :                 else if (audio_type == 3)
     869           0 :                     st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
     870           2 :                 consumed += 9;
     871             :             }
     872        1383 :         } else if (!ff_guidcmp(g, EVENTID_DVBScramblingControlSpanningEvent)) {
     873           3 :             int stream_index = ff_find_stream_index(s, sid);
     874           3 :             if (stream_index >= 0) {
     875           3 :                 avio_skip(pb, 12);
     876           3 :                 if (avio_rl32(pb))
     877           0 :                     av_log(s, AV_LOG_WARNING, "DVB scrambled stream detected (st:%d), decoding will likely fail\n", stream_index);
     878           3 :                 consumed += 16;
     879             :             }
     880        1380 :         } else if (!ff_guidcmp(g, EVENTID_LanguageSpanningEvent)) {
     881           2 :             int stream_index = ff_find_stream_index(s, sid);
     882           2 :             if (stream_index >= 0) {
     883           2 :                 AVStream *st = s->streams[stream_index];
     884             :                 uint8_t language[4];
     885           2 :                 avio_skip(pb, 12);
     886           2 :                 avio_read(pb, language, 3);
     887           2 :                 if (language[0]) {
     888           2 :                     language[3] = 0;
     889           2 :                     av_dict_set(&st->metadata, "language", language, 0);
     890           2 :                     if (!strcmp(language, "nar") || !strcmp(language, "NAR"))
     891           0 :                         st->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
     892             :                 }
     893           2 :                 consumed += 15;
     894             :             }
     895        1378 :         } else if (!ff_guidcmp(g, ff_timestamp_guid)) {
     896         397 :             int stream_index = ff_find_stream_index(s, sid);
     897         397 :             if (stream_index >= 0) {
     898         397 :                 avio_skip(pb, 8);
     899         397 :                 wtv->pts = avio_rl64(pb);
     900         397 :                 consumed += 16;
     901         397 :                 if (wtv->pts == -1)
     902          45 :                     wtv->pts = AV_NOPTS_VALUE;
     903             :                 else {
     904         352 :                     wtv->last_valid_pts = wtv->pts;
     905         352 :                     if (wtv->epoch == AV_NOPTS_VALUE || wtv->pts < wtv->epoch)
     906           5 :                         wtv->epoch = wtv->pts;
     907         352 :                 if (mode == SEEK_TO_PTS && wtv->pts >= seekts) {
     908           5 :                     avio_skip(pb, WTV_PAD8(len) - consumed);
     909           5 :                     return 0;
     910             :                 }
     911             :                 }
     912             :             }
     913         981 :         } else if (!ff_guidcmp(g, ff_data_guid)) {
     914         400 :             int stream_index = ff_find_stream_index(s, sid);
     915         400 :             if (mode == SEEK_TO_DATA && stream_index >= 0 && len > 32 && s->streams[stream_index]->priv_data) {
     916         298 :                 WtvStream *wst = s->streams[stream_index]->priv_data;
     917         298 :                 wst->seen_data = 1;
     918         298 :                 if (len_ptr) {
     919         295 :                     *len_ptr = len;
     920             :                 }
     921         298 :                 return stream_index;
     922             :             }
     923         581 :         } else if (!ff_guidcmp(g, /* DSATTRIB_WMDRMProtectionInfo */ (const ff_asf_guid){0x83,0x95,0x74,0x40,0x9D,0x6B,0xEC,0x4E,0xB4,0x3C,0x67,0xA1,0x80,0x1E,0x1A,0x9B})) {
     924           0 :             int stream_index = ff_find_stream_index(s, sid);
     925           0 :             if (stream_index >= 0)
     926           0 :                 av_log(s, AV_LOG_WARNING, "encrypted stream detected (st:%d), decoding will likely fail\n", stream_index);
     927         581 :         } else if (
     928        1029 :             !ff_guidcmp(g, /* DSATTRIB_CAPTURE_STREAMTIME */ (const ff_asf_guid){0x14,0x56,0x1A,0x0C,0xCD,0x30,0x40,0x4F,0xBC,0xBF,0xD0,0x3E,0x52,0x30,0x62,0x07}) ||
     929         896 :             !ff_guidcmp(g, /* DSATTRIB_PBDATAG_ATTRIBUTE */ (const ff_asf_guid){0x79,0x66,0xB5,0xE0,0xB9,0x12,0xCC,0x43,0xB7,0xDF,0x57,0x8C,0xAA,0x5A,0x7B,0x63}) ||
     930         800 :             !ff_guidcmp(g, /* DSATTRIB_PicSampleSeq */ (const ff_asf_guid){0x02,0xAE,0x5B,0x2F,0x8F,0x7B,0x60,0x4F,0x82,0xD6,0xE4,0xEA,0x2F,0x1F,0x4C,0x99}) ||
     931         571 :             !ff_guidcmp(g, /* DSATTRIB_TRANSPORT_PROPERTIES */ ff_DSATTRIB_TRANSPORT_PROPERTIES) ||
     932         342 :             !ff_guidcmp(g, /* dvr_ms_vid_frame_rep_data */ (const ff_asf_guid){0xCC,0x32,0x64,0xDD,0x29,0xE2,0xDB,0x40,0x80,0xF6,0xD2,0x63,0x28,0xD2,0x76,0x1F}) ||
     933         245 :             !ff_guidcmp(g, /* EVENTID_ChannelChangeSpanningEvent */ (const ff_asf_guid){0xE5,0xC5,0x67,0x90,0x5C,0x4C,0x05,0x42,0x86,0xC8,0x7A,0xFE,0x20,0xFE,0x1E,0xFA}) ||
     934         243 :             !ff_guidcmp(g, /* EVENTID_ChannelInfoSpanningEvent */ (const ff_asf_guid){0x80,0x6D,0xF3,0x41,0x32,0x41,0xC2,0x4C,0xB1,0x21,0x01,0xA4,0x32,0x19,0xD8,0x1B}) ||
     935         242 :             !ff_guidcmp(g, /* EVENTID_ChannelTypeSpanningEvent */ (const ff_asf_guid){0x51,0x1D,0xAB,0x72,0xD2,0x87,0x9B,0x48,0xBA,0x11,0x0E,0x08,0xDC,0x21,0x02,0x43}) ||
     936         238 :             !ff_guidcmp(g, /* EVENTID_PIDListSpanningEvent */ (const ff_asf_guid){0x65,0x8F,0xFC,0x47,0xBB,0xE2,0x34,0x46,0x9C,0xEF,0xFD,0xBF,0xE6,0x26,0x1D,0x5C}) ||
     937         233 :             !ff_guidcmp(g, /* EVENTID_SignalAndServiceStatusSpanningEvent */ (const ff_asf_guid){0xCB,0xC5,0x68,0x80,0x04,0x3C,0x2B,0x49,0xB4,0x7D,0x03,0x08,0x82,0x0D,0xCE,0x51}) ||
     938         229 :             !ff_guidcmp(g, /* EVENTID_StreamTypeSpanningEvent */ (const ff_asf_guid){0xBC,0x2E,0xAF,0x82,0xA6,0x30,0x64,0x42,0xA8,0x0B,0xAD,0x2E,0x13,0x72,0xAC,0x60}) ||
     939         226 :             !ff_guidcmp(g, (const ff_asf_guid){0x1E,0xBE,0xC3,0xC5,0x43,0x92,0xDC,0x11,0x85,0xE5,0x00,0x12,0x3F,0x6F,0x73,0xB9}) ||
     940         226 :             !ff_guidcmp(g, (const ff_asf_guid){0x3B,0x86,0xA2,0xB1,0xEB,0x1E,0xC3,0x44,0x8C,0x88,0x1C,0xA3,0xFF,0xE3,0xE7,0x6A}) ||
     941         226 :             !ff_guidcmp(g, (const ff_asf_guid){0x4E,0x7F,0x4C,0x5B,0xC4,0xD0,0x38,0x4B,0xA8,0x3E,0x21,0x7F,0x7B,0xBF,0x52,0xE7}) ||
     942         226 :             !ff_guidcmp(g, (const ff_asf_guid){0x63,0x36,0xEB,0xFE,0xA1,0x7E,0xD9,0x11,0x83,0x08,0x00,0x07,0xE9,0x5E,0xAD,0x8D}) ||
     943         226 :             !ff_guidcmp(g, (const ff_asf_guid){0x70,0xE9,0xF1,0xF8,0x89,0xA4,0x4C,0x4D,0x83,0x73,0xB8,0x12,0xE0,0xD5,0xF8,0x1E}) ||
     944         199 :             !ff_guidcmp(g, ff_index_guid) ||
     945         137 :             !ff_guidcmp(g, ff_sync_guid) ||
     946          51 :             !ff_guidcmp(g, ff_stream1_guid) ||
     947           0 :             !ff_guidcmp(g, (const ff_asf_guid){0xF7,0x10,0x02,0xB9,0xEE,0x7C,0xED,0x4E,0xBD,0x7F,0x05,0x40,0x35,0x86,0x18,0xA1})) {
     948             :             //ignore known guids
     949             :         } else
     950           0 :             av_log(s, AV_LOG_WARNING, "unsupported chunk:"FF_PRI_GUID"\n", FF_ARG_GUID(g));
     951             : 
     952        1148 :         avio_skip(pb, WTV_PAD8(len) - consumed);
     953             :     }
     954          12 :     return AVERROR_EOF;
     955             : }
     956             : 
     957           3 : static int read_header(AVFormatContext *s)
     958             : {
     959           3 :     WtvContext *wtv = s->priv_data;
     960             :     int root_sector, root_size;
     961             :     uint8_t root[WTV_SECTOR_SIZE];
     962             :     AVIOContext *pb;
     963             :     int64_t timeline_pos;
     964             :     int64_t ret;
     965             : 
     966           3 :     wtv->epoch          =
     967           3 :     wtv->pts            =
     968           3 :     wtv->last_valid_pts = AV_NOPTS_VALUE;
     969             : 
     970             :     /* read root directory sector */
     971           3 :     avio_skip(s->pb, 0x30);
     972           3 :     root_size = avio_rl32(s->pb);
     973           3 :     if (root_size > sizeof(root)) {
     974           0 :         av_log(s, AV_LOG_ERROR, "root directory size exceeds sector size\n");
     975           0 :         return AVERROR_INVALIDDATA;
     976             :     }
     977           3 :     avio_skip(s->pb, 4);
     978           3 :     root_sector = avio_rl32(s->pb);
     979             : 
     980           3 :     ret = seek_by_sector(s->pb, root_sector, 0);
     981           3 :     if (ret < 0)
     982           0 :         return ret;
     983           3 :     root_size = avio_read(s->pb, root, root_size);
     984           3 :     if (root_size < 0)
     985           0 :         return AVERROR_INVALIDDATA;
     986             : 
     987             :     /* parse chunks up until first data chunk */
     988           3 :     wtv->pb = wtvfile_open(s, root, root_size, ff_timeline_le16);
     989           3 :     if (!wtv->pb) {
     990           0 :         av_log(s, AV_LOG_ERROR, "timeline data missing\n");
     991           0 :         return AVERROR_INVALIDDATA;
     992             :     }
     993             : 
     994           3 :     ret = parse_chunks(s, SEEK_TO_DATA, 0, 0);
     995           3 :     if (ret < 0)
     996           0 :         return ret;
     997           3 :     avio_seek(wtv->pb, -32, SEEK_CUR);
     998             : 
     999           3 :     timeline_pos = avio_tell(s->pb); // save before opening another file
    1000             : 
    1001             :     /* read metadata */
    1002           3 :     pb = wtvfile_open(s, root, root_size, ff_table_0_entries_legacy_attrib_le16);
    1003           3 :     if (pb) {
    1004           3 :         parse_legacy_attrib(s, pb);
    1005           3 :         wtvfile_close(pb);
    1006             :     }
    1007             : 
    1008           3 :     s->ctx_flags |= AVFMTCTX_NOHEADER; // Needed for noStreams.wtv
    1009             : 
    1010             :     /* read seek index */
    1011           3 :     if (s->nb_streams) {
    1012           3 :         AVStream *st = s->streams[0];
    1013           3 :         pb = wtvfile_open(s, root, root_size, ff_table_0_entries_time_le16);
    1014           3 :         if (pb) {
    1015         316 :             while(1) {
    1016         319 :                 uint64_t timestamp = avio_rl64(pb);
    1017         319 :                 uint64_t frame_nb  = avio_rl64(pb);
    1018         319 :                 if (avio_feof(pb))
    1019           3 :                     break;
    1020         316 :                 ff_add_index_entry(&wtv->index_entries, &wtv->nb_index_entries, &wtv->index_entries_allocated_size,
    1021             :                                    0, timestamp, frame_nb, 0, AVINDEX_KEYFRAME);
    1022             :             }
    1023           3 :             wtvfile_close(pb);
    1024             : 
    1025           3 :             if (wtv->nb_index_entries) {
    1026           3 :                 pb = wtvfile_open(s, root, root_size, ff_timeline_table_0_entries_Events_le16);
    1027           3 :                 if (pb) {
    1028           3 :                     AVIndexEntry *e = wtv->index_entries;
    1029           3 :                     AVIndexEntry *e_end = wtv->index_entries + wtv->nb_index_entries - 1;
    1030           3 :                     uint64_t last_position = 0;
    1031         207 :                     while (1) {
    1032         210 :                         uint64_t frame_nb = avio_rl64(pb);
    1033         210 :                         uint64_t position = avio_rl64(pb);
    1034         729 :                         while (e <= e_end && frame_nb > e->size) {
    1035         309 :                             e->pos = last_position;
    1036         309 :                             e++;
    1037             :                         }
    1038         210 :                         if (avio_feof(pb))
    1039           3 :                             break;
    1040         207 :                         last_position = position;
    1041             :                     }
    1042           3 :                     e_end->pos = last_position;
    1043           3 :                     wtvfile_close(pb);
    1044           3 :                     st->duration = e_end->timestamp;
    1045             :                 }
    1046             :             }
    1047             :         }
    1048             :     }
    1049             : 
    1050           3 :     avio_seek(s->pb, timeline_pos, SEEK_SET);
    1051           3 :     return 0;
    1052             : }
    1053             : 
    1054         309 : static int read_packet(AVFormatContext *s, AVPacket *pkt)
    1055             : {
    1056         309 :     WtvContext *wtv = s->priv_data;
    1057         309 :     AVIOContext *pb = wtv->pb;
    1058             :     int stream_index, len, ret;
    1059             : 
    1060         309 :     stream_index = parse_chunks(s, SEEK_TO_DATA, 0, &len);
    1061         309 :     if (stream_index < 0)
    1062          14 :         return stream_index;
    1063             : 
    1064         295 :     ret = av_get_packet(pb, pkt, len - 32);
    1065         295 :     if (ret < 0)
    1066           0 :         return ret;
    1067         295 :     pkt->stream_index = stream_index;
    1068         295 :     pkt->pts          = wtv->pts;
    1069         295 :     avio_skip(pb, WTV_PAD8(len) - len);
    1070         295 :     return 0;
    1071             : }
    1072             : 
    1073          26 : static int read_seek(AVFormatContext *s, int stream_index,
    1074             :                      int64_t ts, int flags)
    1075             : {
    1076          26 :     WtvContext *wtv = s->priv_data;
    1077          26 :     AVIOContext *pb = wtv->pb;
    1078          26 :     AVStream *st = s->streams[0];
    1079             :     int64_t ts_relative;
    1080             :     int i;
    1081             : 
    1082          26 :     if ((flags & AVSEEK_FLAG_FRAME) || (flags & AVSEEK_FLAG_BYTE))
    1083           0 :         return AVERROR(ENOSYS);
    1084             : 
    1085             :     /* timestamp adjustment is required because wtv->pts values are absolute,
    1086             :      * whereas AVIndexEntry->timestamp values are relative to epoch. */
    1087          26 :     ts_relative = ts;
    1088          26 :     if (wtv->epoch != AV_NOPTS_VALUE)
    1089          26 :         ts_relative -= wtv->epoch;
    1090             : 
    1091          26 :     i = ff_index_search_timestamp(wtv->index_entries, wtv->nb_index_entries, ts_relative, flags);
    1092          26 :     if (i < 0) {
    1093          10 :         if (wtv->last_valid_pts == AV_NOPTS_VALUE || ts < wtv->last_valid_pts) {
    1094          10 :             if (avio_seek(pb, 0, SEEK_SET) < 0)
    1095           0 :                 return -1;
    1096           5 :         } else if (st->duration != AV_NOPTS_VALUE && ts_relative > st->duration && wtv->nb_index_entries) {
    1097           5 :             if (avio_seek(pb, wtv->index_entries[wtv->nb_index_entries - 1].pos, SEEK_SET) < 0)
    1098           0 :                 return -1;
    1099             :         }
    1100          10 :         if (parse_chunks(s, SEEK_TO_PTS, ts, 0) < 0)
    1101           5 :             return AVERROR(ERANGE);
    1102           5 :         return 0;
    1103             :     }
    1104          16 :     if (avio_seek(pb, wtv->index_entries[i].pos, SEEK_SET) < 0)
    1105           0 :         return -1;
    1106          16 :     wtv->pts = wtv->index_entries[i].timestamp;
    1107          16 :     if (wtv->epoch != AV_NOPTS_VALUE)
    1108          16 :         wtv->pts += wtv->epoch;
    1109          16 :     wtv->last_valid_pts = wtv->pts;
    1110          16 :     return 0;
    1111             : }
    1112             : 
    1113           3 : static int read_close(AVFormatContext *s)
    1114             : {
    1115           3 :     WtvContext *wtv = s->priv_data;
    1116           3 :     av_freep(&wtv->index_entries);
    1117           3 :     wtvfile_close(wtv->pb);
    1118           3 :     return 0;
    1119             : }
    1120             : 
    1121             : AVInputFormat ff_wtv_demuxer = {
    1122             :     .name           = "wtv",
    1123             :     .long_name      = NULL_IF_CONFIG_SMALL("Windows Television (WTV)"),
    1124             :     .priv_data_size = sizeof(WtvContext),
    1125             :     .read_probe     = read_probe,
    1126             :     .read_header    = read_header,
    1127             :     .read_packet    = read_packet,
    1128             :     .read_seek      = read_seek,
    1129             :     .read_close     = read_close,
    1130             :     .flags          = AVFMT_SHOW_IDS,
    1131             : };

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