LCOV - code coverage report
Current view: top level - libavformat - hls.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 511 1198 42.7 %
Date: 2018-05-20 11:54:08 Functions: 34 50 68.0 %

          Line data    Source code
       1             : /*
       2             :  * Apple HTTP Live Streaming demuxer
       3             :  * Copyright (c) 2010 Martin Storsjo
       4             :  * Copyright (c) 2013 Anssi Hannula
       5             :  *
       6             :  * This file is part of FFmpeg.
       7             :  *
       8             :  * FFmpeg is free software; you can redistribute it and/or
       9             :  * modify it under the terms of the GNU Lesser General Public
      10             :  * License as published by the Free Software Foundation; either
      11             :  * version 2.1 of the License, or (at your option) any later version.
      12             :  *
      13             :  * FFmpeg is distributed in the hope that it will be useful,
      14             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      15             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      16             :  * Lesser General Public License for more details.
      17             :  *
      18             :  * You should have received a copy of the GNU Lesser General Public
      19             :  * License along with FFmpeg; if not, write to the Free Software
      20             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      21             :  */
      22             : 
      23             : /**
      24             :  * @file
      25             :  * Apple HTTP Live Streaming demuxer
      26             :  * http://tools.ietf.org/html/draft-pantos-http-live-streaming
      27             :  */
      28             : 
      29             : #include "libavformat/http.h"
      30             : #include "libavutil/avstring.h"
      31             : #include "libavutil/avassert.h"
      32             : #include "libavutil/intreadwrite.h"
      33             : #include "libavutil/mathematics.h"
      34             : #include "libavutil/opt.h"
      35             : #include "libavutil/dict.h"
      36             : #include "libavutil/time.h"
      37             : #include "avformat.h"
      38             : #include "internal.h"
      39             : #include "avio_internal.h"
      40             : #include "id3v2.h"
      41             : 
      42             : #define INITIAL_BUFFER_SIZE 32768
      43             : 
      44             : #define MAX_FIELD_LEN 64
      45             : #define MAX_CHARACTERISTICS_LEN 512
      46             : 
      47             : #define MPEG_TIME_BASE 90000
      48             : #define MPEG_TIME_BASE_Q (AVRational){1, MPEG_TIME_BASE}
      49             : 
      50             : /*
      51             :  * An apple http stream consists of a playlist with media segment files,
      52             :  * played sequentially. There may be several playlists with the same
      53             :  * video content, in different bandwidth variants, that are played in
      54             :  * parallel (preferably only one bandwidth variant at a time). In this case,
      55             :  * the user supplied the url to a main playlist that only lists the variant
      56             :  * playlists.
      57             :  *
      58             :  * If the main playlist doesn't point at any variants, we still create
      59             :  * one anonymous toplevel variant for this, to maintain the structure.
      60             :  */
      61             : 
      62             : enum KeyType {
      63             :     KEY_NONE,
      64             :     KEY_AES_128,
      65             :     KEY_SAMPLE_AES
      66             : };
      67             : 
      68             : struct segment {
      69             :     int64_t duration;
      70             :     int64_t url_offset;
      71             :     int64_t size;
      72             :     char *url;
      73             :     char *key;
      74             :     enum KeyType key_type;
      75             :     uint8_t iv[16];
      76             :     /* associated Media Initialization Section, treated as a segment */
      77             :     struct segment *init_section;
      78             : };
      79             : 
      80             : struct rendition;
      81             : 
      82             : enum PlaylistType {
      83             :     PLS_TYPE_UNSPECIFIED,
      84             :     PLS_TYPE_EVENT,
      85             :     PLS_TYPE_VOD
      86             : };
      87             : 
      88             : /*
      89             :  * Each playlist has its own demuxer. If it currently is active,
      90             :  * it has an open AVIOContext too, and potentially an AVPacket
      91             :  * containing the next packet from this stream.
      92             :  */
      93             : struct playlist {
      94             :     char url[MAX_URL_SIZE];
      95             :     AVIOContext pb;
      96             :     uint8_t* read_buffer;
      97             :     AVIOContext *input;
      98             :     int input_read_done;
      99             :     AVIOContext *input_next;
     100             :     int input_next_requested;
     101             :     AVFormatContext *parent;
     102             :     int index;
     103             :     AVFormatContext *ctx;
     104             :     AVPacket pkt;
     105             :     int has_noheader_flag;
     106             : 
     107             :     /* main demuxer streams associated with this playlist
     108             :      * indexed by the subdemuxer stream indexes */
     109             :     AVStream **main_streams;
     110             :     int n_main_streams;
     111             : 
     112             :     int finished;
     113             :     enum PlaylistType type;
     114             :     int64_t target_duration;
     115             :     int start_seq_no;
     116             :     int n_segments;
     117             :     struct segment **segments;
     118             :     int needed;
     119             :     int cur_seq_no;
     120             :     int64_t cur_seg_offset;
     121             :     int64_t last_load_time;
     122             : 
     123             :     /* Currently active Media Initialization Section */
     124             :     struct segment *cur_init_section;
     125             :     uint8_t *init_sec_buf;
     126             :     unsigned int init_sec_buf_size;
     127             :     unsigned int init_sec_data_len;
     128             :     unsigned int init_sec_buf_read_offset;
     129             : 
     130             :     char key_url[MAX_URL_SIZE];
     131             :     uint8_t key[16];
     132             : 
     133             :     /* ID3 timestamp handling (elementary audio streams have ID3 timestamps
     134             :      * (and possibly other ID3 tags) in the beginning of each segment) */
     135             :     int is_id3_timestamped; /* -1: not yet known */
     136             :     int64_t id3_mpegts_timestamp; /* in mpegts tb */
     137             :     int64_t id3_offset; /* in stream original tb */
     138             :     uint8_t* id3_buf; /* temp buffer for id3 parsing */
     139             :     unsigned int id3_buf_size;
     140             :     AVDictionary *id3_initial; /* data from first id3 tag */
     141             :     int id3_found; /* ID3 tag found at some point */
     142             :     int id3_changed; /* ID3 tag data has changed at some point */
     143             :     ID3v2ExtraMeta *id3_deferred_extra; /* stored here until subdemuxer is opened */
     144             : 
     145             :     int64_t seek_timestamp;
     146             :     int seek_flags;
     147             :     int seek_stream_index; /* into subdemuxer stream array */
     148             : 
     149             :     /* Renditions associated with this playlist, if any.
     150             :      * Alternative rendition playlists have a single rendition associated
     151             :      * with them, and variant main Media Playlists may have
     152             :      * multiple (playlist-less) renditions associated with them. */
     153             :     int n_renditions;
     154             :     struct rendition **renditions;
     155             : 
     156             :     /* Media Initialization Sections (EXT-X-MAP) associated with this
     157             :      * playlist, if any. */
     158             :     int n_init_sections;
     159             :     struct segment **init_sections;
     160             : };
     161             : 
     162             : /*
     163             :  * Renditions are e.g. alternative subtitle or audio streams.
     164             :  * The rendition may either be an external playlist or it may be
     165             :  * contained in the main Media Playlist of the variant (in which case
     166             :  * playlist is NULL).
     167             :  */
     168             : struct rendition {
     169             :     enum AVMediaType type;
     170             :     struct playlist *playlist;
     171             :     char group_id[MAX_FIELD_LEN];
     172             :     char language[MAX_FIELD_LEN];
     173             :     char name[MAX_FIELD_LEN];
     174             :     int disposition;
     175             : };
     176             : 
     177             : struct variant {
     178             :     int bandwidth;
     179             : 
     180             :     /* every variant contains at least the main Media Playlist in index 0 */
     181             :     int n_playlists;
     182             :     struct playlist **playlists;
     183             : 
     184             :     char audio_group[MAX_FIELD_LEN];
     185             :     char video_group[MAX_FIELD_LEN];
     186             :     char subtitles_group[MAX_FIELD_LEN];
     187             : };
     188             : 
     189             : typedef struct HLSContext {
     190             :     AVClass *class;
     191             :     AVFormatContext *ctx;
     192             :     int n_variants;
     193             :     struct variant **variants;
     194             :     int n_playlists;
     195             :     struct playlist **playlists;
     196             :     int n_renditions;
     197             :     struct rendition **renditions;
     198             : 
     199             :     int cur_seq_no;
     200             :     int live_start_index;
     201             :     int first_packet;
     202             :     int64_t first_timestamp;
     203             :     int64_t cur_timestamp;
     204             :     AVIOInterruptCB *interrupt_callback;
     205             :     AVDictionary *avio_opts;
     206             :     int strict_std_compliance;
     207             :     char *allowed_extensions;
     208             :     int max_reload;
     209             :     int http_persistent;
     210             :     int http_multiple;
     211             :     AVIOContext *playlist_pb;
     212             : } HLSContext;
     213             : 
     214           4 : static void free_segment_dynarray(struct segment **segments, int n_segments)
     215             : {
     216             :     int i;
     217          18 :     for (i = 0; i < n_segments; i++) {
     218          14 :         av_freep(&segments[i]->key);
     219          14 :         av_freep(&segments[i]->url);
     220          14 :         av_freep(&segments[i]);
     221             :     }
     222           4 : }
     223             : 
     224           4 : static void free_segment_list(struct playlist *pls)
     225             : {
     226           4 :         free_segment_dynarray(pls->segments, pls->n_segments);
     227           4 :         av_freep(&pls->segments);
     228           4 :         pls->n_segments = 0;
     229           4 : }
     230             : 
     231           4 : static void free_init_section_list(struct playlist *pls)
     232             : {
     233             :     int i;
     234           4 :     for (i = 0; i < pls->n_init_sections; i++) {
     235           0 :         av_freep(&pls->init_sections[i]->url);
     236           0 :         av_freep(&pls->init_sections[i]);
     237             :     }
     238           4 :     av_freep(&pls->init_sections);
     239           4 :     pls->n_init_sections = 0;
     240           4 : }
     241             : 
     242           4 : static void free_playlist_list(HLSContext *c)
     243             : {
     244             :     int i;
     245           8 :     for (i = 0; i < c->n_playlists; i++) {
     246           4 :         struct playlist *pls = c->playlists[i];
     247           4 :         free_segment_list(pls);
     248           4 :         free_init_section_list(pls);
     249           4 :         av_freep(&pls->main_streams);
     250           4 :         av_freep(&pls->renditions);
     251           4 :         av_freep(&pls->id3_buf);
     252           4 :         av_dict_free(&pls->id3_initial);
     253           4 :         ff_id3v2_free_extra_meta(&pls->id3_deferred_extra);
     254           4 :         av_freep(&pls->init_sec_buf);
     255           4 :         av_packet_unref(&pls->pkt);
     256           4 :         av_freep(&pls->pb.buffer);
     257           4 :         if (pls->input)
     258           0 :             ff_format_io_close(c->ctx, &pls->input);
     259           4 :         pls->input_read_done = 0;
     260           4 :         if (pls->input_next)
     261           0 :             ff_format_io_close(c->ctx, &pls->input_next);
     262           4 :         pls->input_next_requested = 0;
     263           4 :         if (pls->ctx) {
     264           4 :             pls->ctx->pb = NULL;
     265           4 :             avformat_close_input(&pls->ctx);
     266             :         }
     267           4 :         av_free(pls);
     268             :     }
     269           4 :     av_freep(&c->playlists);
     270           4 :     c->n_playlists = 0;
     271           4 : }
     272             : 
     273           4 : static void free_variant_list(HLSContext *c)
     274             : {
     275             :     int i;
     276           8 :     for (i = 0; i < c->n_variants; i++) {
     277           4 :         struct variant *var = c->variants[i];
     278           4 :         av_freep(&var->playlists);
     279           4 :         av_free(var);
     280             :     }
     281           4 :     av_freep(&c->variants);
     282           4 :     c->n_variants = 0;
     283           4 : }
     284             : 
     285           4 : static void free_rendition_list(HLSContext *c)
     286             : {
     287             :     int i;
     288           4 :     for (i = 0; i < c->n_renditions; i++)
     289           0 :         av_freep(&c->renditions[i]);
     290           4 :     av_freep(&c->renditions);
     291           4 :     c->n_renditions = 0;
     292           4 : }
     293             : 
     294             : /*
     295             :  * Used to reset a statically allocated AVPacket to a clean slate,
     296             :  * containing no data.
     297             :  */
     298        2466 : static void reset_packet(AVPacket *pkt)
     299             : {
     300        2466 :     av_init_packet(pkt);
     301        2466 :     pkt->data = NULL;
     302        2466 : }
     303             : 
     304           4 : static struct playlist *new_playlist(HLSContext *c, const char *url,
     305             :                                      const char *base)
     306             : {
     307           4 :     struct playlist *pls = av_mallocz(sizeof(struct playlist));
     308           4 :     if (!pls)
     309           0 :         return NULL;
     310           4 :     reset_packet(&pls->pkt);
     311           4 :     ff_make_absolute_url(pls->url, sizeof(pls->url), base, url);
     312           4 :     pls->seek_timestamp = AV_NOPTS_VALUE;
     313             : 
     314           4 :     pls->is_id3_timestamped = -1;
     315           4 :     pls->id3_mpegts_timestamp = AV_NOPTS_VALUE;
     316             : 
     317           4 :     dynarray_add(&c->playlists, &c->n_playlists, pls);
     318           4 :     return pls;
     319             : }
     320             : 
     321             : struct variant_info {
     322             :     char bandwidth[20];
     323             :     /* variant group ids: */
     324             :     char audio[MAX_FIELD_LEN];
     325             :     char video[MAX_FIELD_LEN];
     326             :     char subtitles[MAX_FIELD_LEN];
     327             : };
     328             : 
     329           4 : static struct variant *new_variant(HLSContext *c, struct variant_info *info,
     330             :                                    const char *url, const char *base)
     331             : {
     332             :     struct variant *var;
     333             :     struct playlist *pls;
     334             : 
     335           4 :     pls = new_playlist(c, url, base);
     336           4 :     if (!pls)
     337           0 :         return NULL;
     338             : 
     339           4 :     var = av_mallocz(sizeof(struct variant));
     340           4 :     if (!var)
     341           0 :         return NULL;
     342             : 
     343           4 :     if (info) {
     344           0 :         var->bandwidth = atoi(info->bandwidth);
     345           0 :         strcpy(var->audio_group, info->audio);
     346           0 :         strcpy(var->video_group, info->video);
     347           0 :         strcpy(var->subtitles_group, info->subtitles);
     348             :     }
     349             : 
     350           4 :     dynarray_add(&c->variants, &c->n_variants, var);
     351           4 :     dynarray_add(&var->playlists, &var->n_playlists, pls);
     352           4 :     return var;
     353             : }
     354             : 
     355           0 : static void handle_variant_args(struct variant_info *info, const char *key,
     356             :                                 int key_len, char **dest, int *dest_len)
     357             : {
     358           0 :     if (!strncmp(key, "BANDWIDTH=", key_len)) {
     359           0 :         *dest     =        info->bandwidth;
     360           0 :         *dest_len = sizeof(info->bandwidth);
     361           0 :     } else if (!strncmp(key, "AUDIO=", key_len)) {
     362           0 :         *dest     =        info->audio;
     363           0 :         *dest_len = sizeof(info->audio);
     364           0 :     } else if (!strncmp(key, "VIDEO=", key_len)) {
     365           0 :         *dest     =        info->video;
     366           0 :         *dest_len = sizeof(info->video);
     367           0 :     } else if (!strncmp(key, "SUBTITLES=", key_len)) {
     368           0 :         *dest     =        info->subtitles;
     369           0 :         *dest_len = sizeof(info->subtitles);
     370             :     }
     371           0 : }
     372             : 
     373             : struct key_info {
     374             :      char uri[MAX_URL_SIZE];
     375             :      char method[11];
     376             :      char iv[35];
     377             : };
     378             : 
     379           0 : static void handle_key_args(struct key_info *info, const char *key,
     380             :                             int key_len, char **dest, int *dest_len)
     381             : {
     382           0 :     if (!strncmp(key, "METHOD=", key_len)) {
     383           0 :         *dest     =        info->method;
     384           0 :         *dest_len = sizeof(info->method);
     385           0 :     } else if (!strncmp(key, "URI=", key_len)) {
     386           0 :         *dest     =        info->uri;
     387           0 :         *dest_len = sizeof(info->uri);
     388           0 :     } else if (!strncmp(key, "IV=", key_len)) {
     389           0 :         *dest     =        info->iv;
     390           0 :         *dest_len = sizeof(info->iv);
     391             :     }
     392           0 : }
     393             : 
     394             : struct init_section_info {
     395             :     char uri[MAX_URL_SIZE];
     396             :     char byterange[32];
     397             : };
     398             : 
     399           0 : static struct segment *new_init_section(struct playlist *pls,
     400             :                                         struct init_section_info *info,
     401             :                                         const char *url_base)
     402             : {
     403             :     struct segment *sec;
     404             :     char *ptr;
     405             :     char tmp_str[MAX_URL_SIZE];
     406             : 
     407           0 :     if (!info->uri[0])
     408           0 :         return NULL;
     409             : 
     410           0 :     sec = av_mallocz(sizeof(*sec));
     411           0 :     if (!sec)
     412           0 :         return NULL;
     413             : 
     414           0 :     ff_make_absolute_url(tmp_str, sizeof(tmp_str), url_base, info->uri);
     415           0 :     sec->url = av_strdup(tmp_str);
     416           0 :     if (!sec->url) {
     417           0 :         av_free(sec);
     418           0 :         return NULL;
     419             :     }
     420             : 
     421           0 :     if (info->byterange[0]) {
     422           0 :         sec->size = strtoll(info->byterange, NULL, 10);
     423           0 :         ptr = strchr(info->byterange, '@');
     424           0 :         if (ptr)
     425           0 :             sec->url_offset = strtoll(ptr+1, NULL, 10);
     426             :     } else {
     427             :         /* the entire file is the init section */
     428           0 :         sec->size = -1;
     429             :     }
     430             : 
     431           0 :     dynarray_add(&pls->init_sections, &pls->n_init_sections, sec);
     432             : 
     433           0 :     return sec;
     434             : }
     435             : 
     436           0 : static void handle_init_section_args(struct init_section_info *info, const char *key,
     437             :                                            int key_len, char **dest, int *dest_len)
     438             : {
     439           0 :     if (!strncmp(key, "URI=", key_len)) {
     440           0 :         *dest     =        info->uri;
     441           0 :         *dest_len = sizeof(info->uri);
     442           0 :     } else if (!strncmp(key, "BYTERANGE=", key_len)) {
     443           0 :         *dest     =        info->byterange;
     444           0 :         *dest_len = sizeof(info->byterange);
     445             :     }
     446           0 : }
     447             : 
     448             : struct rendition_info {
     449             :     char type[16];
     450             :     char uri[MAX_URL_SIZE];
     451             :     char group_id[MAX_FIELD_LEN];
     452             :     char language[MAX_FIELD_LEN];
     453             :     char assoc_language[MAX_FIELD_LEN];
     454             :     char name[MAX_FIELD_LEN];
     455             :     char defaultr[4];
     456             :     char forced[4];
     457             :     char characteristics[MAX_CHARACTERISTICS_LEN];
     458             : };
     459             : 
     460           0 : static struct rendition *new_rendition(HLSContext *c, struct rendition_info *info,
     461             :                                       const char *url_base)
     462             : {
     463             :     struct rendition *rend;
     464           0 :     enum AVMediaType type = AVMEDIA_TYPE_UNKNOWN;
     465             :     char *characteristic;
     466             :     char *chr_ptr;
     467             :     char *saveptr;
     468             : 
     469           0 :     if (!strcmp(info->type, "AUDIO"))
     470           0 :         type = AVMEDIA_TYPE_AUDIO;
     471           0 :     else if (!strcmp(info->type, "VIDEO"))
     472           0 :         type = AVMEDIA_TYPE_VIDEO;
     473           0 :     else if (!strcmp(info->type, "SUBTITLES"))
     474           0 :         type = AVMEDIA_TYPE_SUBTITLE;
     475           0 :     else if (!strcmp(info->type, "CLOSED-CAPTIONS"))
     476             :         /* CLOSED-CAPTIONS is ignored since we do not support CEA-608 CC in
     477             :          * AVC SEI RBSP anyway */
     478           0 :         return NULL;
     479             : 
     480           0 :     if (type == AVMEDIA_TYPE_UNKNOWN)
     481           0 :         return NULL;
     482             : 
     483             :     /* URI is mandatory for subtitles as per spec */
     484           0 :     if (type == AVMEDIA_TYPE_SUBTITLE && !info->uri[0])
     485           0 :         return NULL;
     486             : 
     487             :     /* TODO: handle subtitles (each segment has to parsed separately) */
     488           0 :     if (c->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL)
     489           0 :         if (type == AVMEDIA_TYPE_SUBTITLE)
     490           0 :             return NULL;
     491             : 
     492           0 :     rend = av_mallocz(sizeof(struct rendition));
     493           0 :     if (!rend)
     494           0 :         return NULL;
     495             : 
     496           0 :     dynarray_add(&c->renditions, &c->n_renditions, rend);
     497             : 
     498           0 :     rend->type = type;
     499           0 :     strcpy(rend->group_id, info->group_id);
     500           0 :     strcpy(rend->language, info->language);
     501           0 :     strcpy(rend->name, info->name);
     502             : 
     503             :     /* add the playlist if this is an external rendition */
     504           0 :     if (info->uri[0]) {
     505           0 :         rend->playlist = new_playlist(c, info->uri, url_base);
     506           0 :         if (rend->playlist)
     507           0 :             dynarray_add(&rend->playlist->renditions,
     508             :                          &rend->playlist->n_renditions, rend);
     509             :     }
     510             : 
     511           0 :     if (info->assoc_language[0]) {
     512           0 :         int langlen = strlen(rend->language);
     513           0 :         if (langlen < sizeof(rend->language) - 3) {
     514           0 :             rend->language[langlen] = ',';
     515           0 :             strncpy(rend->language + langlen + 1, info->assoc_language,
     516             :                     sizeof(rend->language) - langlen - 2);
     517             :         }
     518             :     }
     519             : 
     520           0 :     if (!strcmp(info->defaultr, "YES"))
     521           0 :         rend->disposition |= AV_DISPOSITION_DEFAULT;
     522           0 :     if (!strcmp(info->forced, "YES"))
     523           0 :         rend->disposition |= AV_DISPOSITION_FORCED;
     524             : 
     525           0 :     chr_ptr = info->characteristics;
     526           0 :     while ((characteristic = av_strtok(chr_ptr, ",", &saveptr))) {
     527           0 :         if (!strcmp(characteristic, "public.accessibility.describes-music-and-sound"))
     528           0 :             rend->disposition |= AV_DISPOSITION_HEARING_IMPAIRED;
     529           0 :         else if (!strcmp(characteristic, "public.accessibility.describes-video"))
     530           0 :             rend->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED;
     531             : 
     532           0 :         chr_ptr = NULL;
     533             :     }
     534             : 
     535           0 :     return rend;
     536             : }
     537             : 
     538           0 : static void handle_rendition_args(struct rendition_info *info, const char *key,
     539             :                                   int key_len, char **dest, int *dest_len)
     540             : {
     541           0 :     if (!strncmp(key, "TYPE=", key_len)) {
     542           0 :         *dest     =        info->type;
     543           0 :         *dest_len = sizeof(info->type);
     544           0 :     } else if (!strncmp(key, "URI=", key_len)) {
     545           0 :         *dest     =        info->uri;
     546           0 :         *dest_len = sizeof(info->uri);
     547           0 :     } else if (!strncmp(key, "GROUP-ID=", key_len)) {
     548           0 :         *dest     =        info->group_id;
     549           0 :         *dest_len = sizeof(info->group_id);
     550           0 :     } else if (!strncmp(key, "LANGUAGE=", key_len)) {
     551           0 :         *dest     =        info->language;
     552           0 :         *dest_len = sizeof(info->language);
     553           0 :     } else if (!strncmp(key, "ASSOC-LANGUAGE=", key_len)) {
     554           0 :         *dest     =        info->assoc_language;
     555           0 :         *dest_len = sizeof(info->assoc_language);
     556           0 :     } else if (!strncmp(key, "NAME=", key_len)) {
     557           0 :         *dest     =        info->name;
     558           0 :         *dest_len = sizeof(info->name);
     559           0 :     } else if (!strncmp(key, "DEFAULT=", key_len)) {
     560           0 :         *dest     =        info->defaultr;
     561           0 :         *dest_len = sizeof(info->defaultr);
     562           0 :     } else if (!strncmp(key, "FORCED=", key_len)) {
     563           0 :         *dest     =        info->forced;
     564           0 :         *dest_len = sizeof(info->forced);
     565           0 :     } else if (!strncmp(key, "CHARACTERISTICS=", key_len)) {
     566           0 :         *dest     =        info->characteristics;
     567           0 :         *dest_len = sizeof(info->characteristics);
     568             :     }
     569             :     /*
     570             :      * ignored:
     571             :      * - AUTOSELECT: client may autoselect based on e.g. system language
     572             :      * - INSTREAM-ID: EIA-608 closed caption number ("CC1".."CC4")
     573             :      */
     574           0 : }
     575             : 
     576             : /* used by parse_playlist to allocate a new variant+playlist when the
     577             :  * playlist is detected to be a Media Playlist (not Master Playlist)
     578             :  * and we have no parent Master Playlist (parsing of which would have
     579             :  * allocated the variant and playlist already)
     580             :  * *pls == NULL  => Master Playlist or parentless Media Playlist
     581             :  * *pls != NULL => parented Media Playlist, playlist+variant allocated */
     582           8 : static int ensure_playlist(HLSContext *c, struct playlist **pls, const char *url)
     583             : {
     584           8 :     if (*pls)
     585           4 :         return 0;
     586           4 :     if (!new_variant(c, NULL, url, NULL))
     587           0 :         return AVERROR(ENOMEM);
     588           4 :     *pls = c->playlists[c->n_playlists - 1];
     589           4 :     return 0;
     590             : }
     591             : 
     592           0 : static int open_url_keepalive(AVFormatContext *s, AVIOContext **pb,
     593             :                               const char *url)
     594             : {
     595             : #if !CONFIG_HTTP_PROTOCOL
     596             :     return AVERROR_PROTOCOL_NOT_FOUND;
     597             : #else
     598             :     int ret;
     599           0 :     URLContext *uc = ffio_geturlcontext(*pb);
     600           0 :     av_assert0(uc);
     601           0 :     (*pb)->eof_reached = 0;
     602           0 :     ret = ff_http_do_new_request(uc, url);
     603           0 :     if (ret < 0) {
     604           0 :         ff_format_io_close(s, pb);
     605             :     }
     606           0 :     return ret;
     607             : #endif
     608             : }
     609             : 
     610          14 : static int open_url(AVFormatContext *s, AVIOContext **pb, const char *url,
     611             :                     AVDictionary *opts, AVDictionary *opts2, int *is_http_out)
     612             : {
     613          14 :     HLSContext *c = s->priv_data;
     614          14 :     AVDictionary *tmp = NULL;
     615          14 :     const char *proto_name = NULL;
     616             :     int ret;
     617          14 :     int is_http = 0;
     618             : 
     619          14 :     av_dict_copy(&tmp, opts, 0);
     620          14 :     av_dict_copy(&tmp, opts2, 0);
     621             : 
     622          14 :     if (av_strstart(url, "crypto", NULL)) {
     623           0 :         if (url[6] == '+' || url[6] == ':')
     624           0 :             proto_name = avio_find_protocol_name(url + 7);
     625             :     }
     626             : 
     627          14 :     if (!proto_name)
     628          14 :         proto_name = avio_find_protocol_name(url);
     629             : 
     630          14 :     if (!proto_name)
     631           0 :         return AVERROR_INVALIDDATA;
     632             : 
     633             :     // only http(s) & file are allowed
     634          14 :     if (av_strstart(proto_name, "file", NULL)) {
     635          14 :         if (strcmp(c->allowed_extensions, "ALL") && !av_match_ext(url, c->allowed_extensions)) {
     636           0 :             av_log(s, AV_LOG_ERROR,
     637             :                 "Filename extension of \'%s\' is not a common multimedia extension, blocked for security reasons.\n"
     638             :                 "If you wish to override this adjust allowed_extensions, you can set it to \'ALL\' to allow all\n",
     639             :                 url);
     640           0 :             return AVERROR_INVALIDDATA;
     641             :         }
     642           0 :     } else if (av_strstart(proto_name, "http", NULL)) {
     643           0 :         is_http = 1;
     644             :     } else
     645           0 :         return AVERROR_INVALIDDATA;
     646             : 
     647          14 :     if (!strncmp(proto_name, url, strlen(proto_name)) && url[strlen(proto_name)] == ':')
     648             :         ;
     649          14 :     else if (av_strstart(url, "crypto", NULL) && !strncmp(proto_name, url + 7, strlen(proto_name)) && url[7 + strlen(proto_name)] == ':')
     650             :         ;
     651          14 :     else if (strcmp(proto_name, "file") || !strncmp(url, "file,", 5))
     652           0 :         return AVERROR_INVALIDDATA;
     653             : 
     654          14 :     if (is_http && c->http_persistent && *pb) {
     655           0 :         ret = open_url_keepalive(c->ctx, pb, url);
     656           0 :         if (ret == AVERROR_EXIT) {
     657           0 :             return ret;
     658           0 :         } else if (ret < 0) {
     659           0 :             if (ret != AVERROR_EOF)
     660           0 :                 av_log(s, AV_LOG_WARNING,
     661             :                     "keepalive request failed for '%s', retrying with new connection: %s\n",
     662           0 :                     url, av_err2str(ret));
     663           0 :             ret = s->io_open(s, pb, url, AVIO_FLAG_READ, &tmp);
     664             :         }
     665             :     } else {
     666          14 :         ret = s->io_open(s, pb, url, AVIO_FLAG_READ, &tmp);
     667             :     }
     668          14 :     if (ret >= 0) {
     669             :         // update cookies on http response with setcookies.
     670          14 :         char *new_cookies = NULL;
     671             : 
     672          14 :         if (!(s->flags & AVFMT_FLAG_CUSTOM_IO))
     673          14 :             av_opt_get(*pb, "cookies", AV_OPT_SEARCH_CHILDREN, (uint8_t**)&new_cookies);
     674             : 
     675          14 :         if (new_cookies)
     676           0 :             av_dict_set(&opts, "cookies", new_cookies, AV_DICT_DONT_STRDUP_VAL);
     677             :     }
     678             : 
     679          14 :     av_dict_free(&tmp);
     680             : 
     681          14 :     if (is_http_out)
     682          14 :         *is_http_out = is_http;
     683             : 
     684          14 :     return ret;
     685             : }
     686             : 
     687           4 : static int parse_playlist(HLSContext *c, const char *url,
     688             :                           struct playlist *pls, AVIOContext *in)
     689             : {
     690           4 :     int ret = 0, is_segment = 0, is_variant = 0;
     691           4 :     int64_t duration = 0;
     692           4 :     enum KeyType key_type = KEY_NONE;
     693           4 :     uint8_t iv[16] = "";
     694           4 :     int has_iv = 0;
     695           4 :     char key[MAX_URL_SIZE] = "";
     696             :     char line[MAX_URL_SIZE];
     697             :     const char *ptr;
     698           4 :     int close_in = 0;
     699           4 :     int64_t seg_offset = 0;
     700           4 :     int64_t seg_size = -1;
     701           4 :     uint8_t *new_url = NULL;
     702             :     struct variant_info variant_info;
     703             :     char tmp_str[MAX_URL_SIZE];
     704           4 :     struct segment *cur_init_section = NULL;
     705           4 :     int is_http = av_strstart(url, "http", NULL);
     706           4 :     struct segment **prev_segments = NULL;
     707           4 :     int prev_n_segments = 0;
     708           4 :     int prev_start_seq_no = -1;
     709             : 
     710           4 :     if (is_http && !in && c->http_persistent && c->playlist_pb) {
     711           0 :         in = c->playlist_pb;
     712           0 :         ret = open_url_keepalive(c->ctx, &c->playlist_pb, url);
     713           0 :         if (ret == AVERROR_EXIT) {
     714           0 :             return ret;
     715           0 :         } else if (ret < 0) {
     716           0 :             if (ret != AVERROR_EOF)
     717           0 :                 av_log(c->ctx, AV_LOG_WARNING,
     718             :                     "keepalive request failed for '%s', retrying with new connection: %s\n",
     719           0 :                     url, av_err2str(ret));
     720           0 :             in = NULL;
     721             :         }
     722             :     }
     723             : 
     724           4 :     if (!in) {
     725           0 :         AVDictionary *opts = NULL;
     726           0 :         av_dict_copy(&opts, c->avio_opts, 0);
     727             : 
     728           0 :         if (c->http_persistent)
     729           0 :             av_dict_set(&opts, "multiple_requests", "1", 0);
     730             : 
     731           0 :         ret = c->ctx->io_open(c->ctx, &in, url, AVIO_FLAG_READ, &opts);
     732           0 :         av_dict_free(&opts);
     733           0 :         if (ret < 0)
     734           0 :             return ret;
     735             : 
     736           0 :         if (is_http && c->http_persistent)
     737           0 :             c->playlist_pb = in;
     738             :         else
     739           0 :             close_in = 1;
     740             :     }
     741             : 
     742           4 :     if (av_opt_get(in, "location", AV_OPT_SEARCH_CHILDREN, &new_url) >= 0)
     743           0 :         url = new_url;
     744             : 
     745           4 :     ff_get_chomp_line(in, line, sizeof(line));
     746           4 :     if (strcmp(line, "#EXTM3U")) {
     747           0 :         ret = AVERROR_INVALIDDATA;
     748           0 :         goto fail;
     749             :     }
     750             : 
     751           4 :     if (pls) {
     752           0 :         prev_start_seq_no = pls->start_seq_no;
     753           0 :         prev_segments = pls->segments;
     754           0 :         prev_n_segments = pls->n_segments;
     755           0 :         pls->segments = NULL;
     756           0 :         pls->n_segments = 0;
     757             : 
     758           0 :         pls->finished = 0;
     759           0 :         pls->type = PLS_TYPE_UNSPECIFIED;
     760             :     }
     761          60 :     while (!avio_feof(in)) {
     762          52 :         ff_get_chomp_line(in, line, sizeof(line));
     763          52 :         if (av_strstart(line, "#EXT-X-STREAM-INF:", &ptr)) {
     764           0 :             is_variant = 1;
     765           0 :             memset(&variant_info, 0, sizeof(variant_info));
     766           0 :             ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_variant_args,
     767             :                                &variant_info);
     768          52 :         } else if (av_strstart(line, "#EXT-X-KEY:", &ptr)) {
     769           0 :             struct key_info info = {{0}};
     770           0 :             ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_key_args,
     771             :                                &info);
     772           0 :             key_type = KEY_NONE;
     773           0 :             has_iv = 0;
     774           0 :             if (!strcmp(info.method, "AES-128"))
     775           0 :                 key_type = KEY_AES_128;
     776           0 :             if (!strcmp(info.method, "SAMPLE-AES"))
     777           0 :                 key_type = KEY_SAMPLE_AES;
     778           0 :             if (!strncmp(info.iv, "0x", 2) || !strncmp(info.iv, "0X", 2)) {
     779           0 :                 ff_hex_to_data(iv, info.iv + 2);
     780           0 :                 has_iv = 1;
     781             :             }
     782           0 :             av_strlcpy(key, info.uri, sizeof(key));
     783          52 :         } else if (av_strstart(line, "#EXT-X-MEDIA:", &ptr)) {
     784           0 :             struct rendition_info info = {{0}};
     785           0 :             ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_rendition_args,
     786             :                                &info);
     787           0 :             new_rendition(c, &info, url);
     788          52 :         } else if (av_strstart(line, "#EXT-X-TARGETDURATION:", &ptr)) {
     789           4 :             ret = ensure_playlist(c, &pls, url);
     790           4 :             if (ret < 0)
     791           0 :                 goto fail;
     792           4 :             pls->target_duration = strtoll(ptr, NULL, 10) * AV_TIME_BASE;
     793          48 :         } else if (av_strstart(line, "#EXT-X-MEDIA-SEQUENCE:", &ptr)) {
     794           4 :             ret = ensure_playlist(c, &pls, url);
     795           4 :             if (ret < 0)
     796           0 :                 goto fail;
     797           4 :             pls->start_seq_no = atoi(ptr);
     798          44 :         } else if (av_strstart(line, "#EXT-X-PLAYLIST-TYPE:", &ptr)) {
     799           0 :             ret = ensure_playlist(c, &pls, url);
     800           0 :             if (ret < 0)
     801           0 :                 goto fail;
     802           0 :             if (!strcmp(ptr, "EVENT"))
     803           0 :                 pls->type = PLS_TYPE_EVENT;
     804           0 :             else if (!strcmp(ptr, "VOD"))
     805           0 :                 pls->type = PLS_TYPE_VOD;
     806          44 :         } else if (av_strstart(line, "#EXT-X-MAP:", &ptr)) {
     807           0 :             struct init_section_info info = {{0}};
     808           0 :             ret = ensure_playlist(c, &pls, url);
     809           0 :             if (ret < 0)
     810           0 :                 goto fail;
     811           0 :             ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_init_section_args,
     812             :                                &info);
     813           0 :             cur_init_section = new_init_section(pls, &info, url);
     814          44 :         } else if (av_strstart(line, "#EXT-X-ENDLIST", &ptr)) {
     815           4 :             if (pls)
     816           4 :                 pls->finished = 1;
     817          40 :         } else if (av_strstart(line, "#EXTINF:", &ptr)) {
     818          14 :             is_segment = 1;
     819          14 :             duration   = atof(ptr) * AV_TIME_BASE;
     820          26 :         } else if (av_strstart(line, "#EXT-X-BYTERANGE:", &ptr)) {
     821           0 :             seg_size = strtoll(ptr, NULL, 10);
     822           0 :             ptr = strchr(ptr, '@');
     823           0 :             if (ptr)
     824           0 :                 seg_offset = strtoll(ptr+1, NULL, 10);
     825          26 :         } else if (av_strstart(line, "#", NULL)) {
     826           8 :             continue;
     827          18 :         } else if (line[0]) {
     828          14 :             if (is_variant) {
     829           0 :                 if (!new_variant(c, &variant_info, line, url)) {
     830           0 :                     ret = AVERROR(ENOMEM);
     831           0 :                     goto fail;
     832             :                 }
     833           0 :                 is_variant = 0;
     834             :             }
     835          14 :             if (is_segment) {
     836             :                 struct segment *seg;
     837          14 :                 if (!pls) {
     838           0 :                     if (!new_variant(c, 0, url, NULL)) {
     839           0 :                         ret = AVERROR(ENOMEM);
     840           0 :                         goto fail;
     841             :                     }
     842           0 :                     pls = c->playlists[c->n_playlists - 1];
     843             :                 }
     844          14 :                 seg = av_malloc(sizeof(struct segment));
     845          14 :                 if (!seg) {
     846           0 :                     ret = AVERROR(ENOMEM);
     847           0 :                     goto fail;
     848             :                 }
     849          14 :                 seg->duration = duration;
     850          14 :                 seg->key_type = key_type;
     851          14 :                 if (has_iv) {
     852           0 :                     memcpy(seg->iv, iv, sizeof(iv));
     853             :                 } else {
     854          14 :                     int seq = pls->start_seq_no + pls->n_segments;
     855          14 :                     memset(seg->iv, 0, sizeof(seg->iv));
     856          14 :                     AV_WB32(seg->iv + 12, seq);
     857             :                 }
     858             : 
     859          14 :                 if (key_type != KEY_NONE) {
     860           0 :                     ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, key);
     861           0 :                     seg->key = av_strdup(tmp_str);
     862           0 :                     if (!seg->key) {
     863           0 :                         av_free(seg);
     864           0 :                         ret = AVERROR(ENOMEM);
     865           0 :                         goto fail;
     866             :                     }
     867             :                 } else {
     868          14 :                     seg->key = NULL;
     869             :                 }
     870             : 
     871          14 :                 ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, line);
     872          14 :                 seg->url = av_strdup(tmp_str);
     873          14 :                 if (!seg->url) {
     874           0 :                     av_free(seg->key);
     875           0 :                     av_free(seg);
     876           0 :                     ret = AVERROR(ENOMEM);
     877           0 :                     goto fail;
     878             :                 }
     879             : 
     880          14 :                 dynarray_add(&pls->segments, &pls->n_segments, seg);
     881          14 :                 is_segment = 0;
     882             : 
     883          14 :                 seg->size = seg_size;
     884          14 :                 if (seg_size >= 0) {
     885           0 :                     seg->url_offset = seg_offset;
     886           0 :                     seg_offset += seg_size;
     887           0 :                     seg_size = -1;
     888             :                 } else {
     889          14 :                     seg->url_offset = 0;
     890          14 :                     seg_offset = 0;
     891             :                 }
     892             : 
     893          14 :                 seg->init_section = cur_init_section;
     894             :             }
     895             :         }
     896             :     }
     897           4 :     if (prev_segments) {
     898           0 :         if (pls->start_seq_no > prev_start_seq_no && c->first_timestamp != AV_NOPTS_VALUE) {
     899           0 :             int64_t prev_timestamp = c->first_timestamp;
     900           0 :             int i, diff = pls->start_seq_no - prev_start_seq_no;
     901           0 :             for (i = 0; i < prev_n_segments && i < diff; i++) {
     902           0 :                 c->first_timestamp += prev_segments[i]->duration;
     903             :             }
     904           0 :             av_log(c->ctx, AV_LOG_DEBUG, "Media sequence change (%d -> %d)"
     905             :                    " reflected in first_timestamp: %"PRId64" -> %"PRId64"\n",
     906           0 :                    prev_start_seq_no, pls->start_seq_no,
     907             :                    prev_timestamp, c->first_timestamp);
     908           0 :         } else if (pls->start_seq_no < prev_start_seq_no) {
     909           0 :             av_log(c->ctx, AV_LOG_WARNING, "Media sequence changed unexpectedly: %d -> %d\n",
     910           0 :                    prev_start_seq_no, pls->start_seq_no);
     911             :         }
     912           0 :         free_segment_dynarray(prev_segments, prev_n_segments);
     913             :     }
     914           4 :     if (pls)
     915           4 :         pls->last_load_time = av_gettime_relative();
     916             : 
     917           4 : fail:
     918           4 :     av_free(new_url);
     919           4 :     if (close_in)
     920           0 :         ff_format_io_close(c->ctx, &in);
     921           4 :     c->ctx->ctx_flags = c->ctx->ctx_flags & ~(unsigned)AVFMTCTX_UNSEEKABLE;
     922           8 :     if (!c->n_variants || !c->variants[0]->n_playlists ||
     923           4 :         !(c->variants[0]->playlists[0]->finished ||
     924           0 :           c->variants[0]->playlists[0]->type == PLS_TYPE_EVENT))
     925           0 :         c->ctx->ctx_flags |= AVFMTCTX_UNSEEKABLE;
     926           4 :     return ret;
     927             : }
     928             : 
     929         149 : static struct segment *current_segment(struct playlist *pls)
     930             : {
     931         149 :     return pls->segments[pls->cur_seq_no - pls->start_seq_no];
     932             : }
     933             : 
     934         131 : static struct segment *next_segment(struct playlist *pls)
     935             : {
     936         131 :     int n = pls->cur_seq_no - pls->start_seq_no + 1;
     937         131 :     if (n >= pls->n_segments)
     938          39 :         return NULL;
     939          92 :     return pls->segments[n];
     940             : }
     941             : 
     942         131 : static int read_from_url(struct playlist *pls, struct segment *seg,
     943             :                          uint8_t *buf, int buf_size)
     944             : {
     945             :     int ret;
     946             : 
     947             :      /* limit read if the segment was only a part of a file */
     948         131 :     if (seg->size >= 0)
     949           0 :         buf_size = FFMIN(buf_size, seg->size - pls->cur_seg_offset);
     950             : 
     951         131 :     ret = avio_read(pls->input, buf, buf_size);
     952         131 :     if (ret > 0)
     953         117 :         pls->cur_seg_offset += ret;
     954             : 
     955         131 :     return ret;
     956             : }
     957             : 
     958             : /* Parse the raw ID3 data and pass contents to caller */
     959           0 : static void parse_id3(AVFormatContext *s, AVIOContext *pb,
     960             :                       AVDictionary **metadata, int64_t *dts,
     961             :                       ID3v2ExtraMetaAPIC **apic, ID3v2ExtraMeta **extra_meta)
     962             : {
     963             :     static const char id3_priv_owner_ts[] = "com.apple.streaming.transportStreamTimestamp";
     964             :     ID3v2ExtraMeta *meta;
     965             : 
     966           0 :     ff_id3v2_read_dict(pb, metadata, ID3v2_DEFAULT_MAGIC, extra_meta);
     967           0 :     for (meta = *extra_meta; meta; meta = meta->next) {
     968           0 :         if (!strcmp(meta->tag, "PRIV")) {
     969           0 :             ID3v2ExtraMetaPRIV *priv = meta->data;
     970           0 :             if (priv->datasize == 8 && !strcmp(priv->owner, id3_priv_owner_ts)) {
     971             :                 /* 33-bit MPEG timestamp */
     972           0 :                 int64_t ts = AV_RB64(priv->data);
     973           0 :                 av_log(s, AV_LOG_DEBUG, "HLS ID3 audio timestamp %"PRId64"\n", ts);
     974           0 :                 if ((ts & ~((1ULL << 33) - 1)) == 0)
     975           0 :                     *dts = ts;
     976             :                 else
     977           0 :                     av_log(s, AV_LOG_ERROR, "Invalid HLS ID3 audio timestamp %"PRId64"\n", ts);
     978             :             }
     979           0 :         } else if (!strcmp(meta->tag, "APIC") && apic)
     980           0 :             *apic = meta->data;
     981             :     }
     982           0 : }
     983             : 
     984             : /* Check if the ID3 metadata contents have changed */
     985           0 : static int id3_has_changed_values(struct playlist *pls, AVDictionary *metadata,
     986             :                                   ID3v2ExtraMetaAPIC *apic)
     987             : {
     988           0 :     AVDictionaryEntry *entry = NULL;
     989             :     AVDictionaryEntry *oldentry;
     990             :     /* check that no keys have changed values */
     991           0 :     while ((entry = av_dict_get(metadata, "", entry, AV_DICT_IGNORE_SUFFIX))) {
     992           0 :         oldentry = av_dict_get(pls->id3_initial, entry->key, NULL, AV_DICT_MATCH_CASE);
     993           0 :         if (!oldentry || strcmp(oldentry->value, entry->value) != 0)
     994           0 :             return 1;
     995             :     }
     996             : 
     997             :     /* check if apic appeared */
     998           0 :     if (apic && (pls->ctx->nb_streams != 2 || !pls->ctx->streams[1]->attached_pic.data))
     999           0 :         return 1;
    1000             : 
    1001           0 :     if (apic) {
    1002           0 :         int size = pls->ctx->streams[1]->attached_pic.size;
    1003           0 :         if (size != apic->buf->size - AV_INPUT_BUFFER_PADDING_SIZE)
    1004           0 :             return 1;
    1005             : 
    1006           0 :         if (memcmp(apic->buf->data, pls->ctx->streams[1]->attached_pic.data, size) != 0)
    1007           0 :             return 1;
    1008             :     }
    1009             : 
    1010           0 :     return 0;
    1011             : }
    1012             : 
    1013             : /* Parse ID3 data and handle the found data */
    1014           0 : static void handle_id3(AVIOContext *pb, struct playlist *pls)
    1015             : {
    1016           0 :     AVDictionary *metadata = NULL;
    1017           0 :     ID3v2ExtraMetaAPIC *apic = NULL;
    1018           0 :     ID3v2ExtraMeta *extra_meta = NULL;
    1019           0 :     int64_t timestamp = AV_NOPTS_VALUE;
    1020             : 
    1021           0 :     parse_id3(pls->ctx, pb, &metadata, &timestamp, &apic, &extra_meta);
    1022             : 
    1023           0 :     if (timestamp != AV_NOPTS_VALUE) {
    1024           0 :         pls->id3_mpegts_timestamp = timestamp;
    1025           0 :         pls->id3_offset = 0;
    1026             :     }
    1027             : 
    1028           0 :     if (!pls->id3_found) {
    1029             :         /* initial ID3 tags */
    1030           0 :         av_assert0(!pls->id3_deferred_extra);
    1031           0 :         pls->id3_found = 1;
    1032             : 
    1033             :         /* get picture attachment and set text metadata */
    1034           0 :         if (pls->ctx->nb_streams)
    1035           0 :             ff_id3v2_parse_apic(pls->ctx, &extra_meta);
    1036             :         else
    1037             :             /* demuxer not yet opened, defer picture attachment */
    1038           0 :             pls->id3_deferred_extra = extra_meta;
    1039             : 
    1040           0 :         ff_id3v2_parse_priv_dict(&metadata, &extra_meta);
    1041           0 :         av_dict_copy(&pls->ctx->metadata, metadata, 0);
    1042           0 :         pls->id3_initial = metadata;
    1043             : 
    1044             :     } else {
    1045           0 :         if (!pls->id3_changed && id3_has_changed_values(pls, metadata, apic)) {
    1046           0 :             avpriv_report_missing_feature(pls->ctx, "Changing ID3 metadata in HLS audio elementary stream");
    1047           0 :             pls->id3_changed = 1;
    1048             :         }
    1049           0 :         av_dict_free(&metadata);
    1050             :     }
    1051             : 
    1052           0 :     if (!pls->id3_deferred_extra)
    1053           0 :         ff_id3v2_free_extra_meta(&extra_meta);
    1054           0 : }
    1055             : 
    1056           4 : static void intercept_id3(struct playlist *pls, uint8_t *buf,
    1057             :                          int buf_size, int *len)
    1058             : {
    1059             :     /* intercept id3 tags, we do not want to pass them to the raw
    1060             :      * demuxer on all segment switches */
    1061             :     int bytes;
    1062           4 :     int id3_buf_pos = 0;
    1063           4 :     int fill_buf = 0;
    1064           4 :     struct segment *seg = current_segment(pls);
    1065             : 
    1066             :     /* gather all the id3 tags */
    1067             :     while (1) {
    1068             :         /* see if we can retrieve enough data for ID3 header */
    1069           4 :         if (*len < ID3v2_HEADER_SIZE && buf_size >= ID3v2_HEADER_SIZE) {
    1070           0 :             bytes = read_from_url(pls, seg, buf + *len, ID3v2_HEADER_SIZE - *len);
    1071           0 :             if (bytes > 0) {
    1072             : 
    1073           0 :                 if (bytes == ID3v2_HEADER_SIZE - *len)
    1074             :                     /* no EOF yet, so fill the caller buffer again after
    1075             :                      * we have stripped the ID3 tags */
    1076           0 :                     fill_buf = 1;
    1077             : 
    1078           0 :                 *len += bytes;
    1079             : 
    1080           0 :             } else if (*len <= 0) {
    1081             :                 /* error/EOF */
    1082           0 :                 *len = bytes;
    1083           0 :                 fill_buf = 0;
    1084             :             }
    1085             :         }
    1086             : 
    1087           4 :         if (*len < ID3v2_HEADER_SIZE)
    1088           0 :             break;
    1089             : 
    1090           4 :         if (ff_id3v2_match(buf, ID3v2_DEFAULT_MAGIC)) {
    1091           0 :             int64_t maxsize = seg->size >= 0 ? seg->size : 1024*1024;
    1092           0 :             int taglen = ff_id3v2_tag_len(buf);
    1093           0 :             int tag_got_bytes = FFMIN(taglen, *len);
    1094           0 :             int remaining = taglen - tag_got_bytes;
    1095             : 
    1096           0 :             if (taglen > maxsize) {
    1097           0 :                 av_log(pls->ctx, AV_LOG_ERROR, "Too large HLS ID3 tag (%d > %"PRId64" bytes)\n",
    1098             :                        taglen, maxsize);
    1099           0 :                 break;
    1100             :             }
    1101             : 
    1102             :             /*
    1103             :              * Copy the id3 tag to our temporary id3 buffer.
    1104             :              * We could read a small id3 tag directly without memcpy, but
    1105             :              * we would still need to copy the large tags, and handling
    1106             :              * both of those cases together with the possibility for multiple
    1107             :              * tags would make the handling a bit complex.
    1108             :              */
    1109           0 :             pls->id3_buf = av_fast_realloc(pls->id3_buf, &pls->id3_buf_size, id3_buf_pos + taglen);
    1110           0 :             if (!pls->id3_buf)
    1111           0 :                 break;
    1112           0 :             memcpy(pls->id3_buf + id3_buf_pos, buf, tag_got_bytes);
    1113           0 :             id3_buf_pos += tag_got_bytes;
    1114             : 
    1115             :             /* strip the intercepted bytes */
    1116           0 :             *len -= tag_got_bytes;
    1117           0 :             memmove(buf, buf + tag_got_bytes, *len);
    1118           0 :             av_log(pls->ctx, AV_LOG_DEBUG, "Stripped %d HLS ID3 bytes\n", tag_got_bytes);
    1119             : 
    1120           0 :             if (remaining > 0) {
    1121             :                 /* read the rest of the tag in */
    1122           0 :                 if (read_from_url(pls, seg, pls->id3_buf + id3_buf_pos, remaining) != remaining)
    1123           0 :                     break;
    1124           0 :                 id3_buf_pos += remaining;
    1125           0 :                 av_log(pls->ctx, AV_LOG_DEBUG, "Stripped additional %d HLS ID3 bytes\n", remaining);
    1126             :             }
    1127             : 
    1128             :         } else {
    1129             :             /* no more ID3 tags */
    1130           4 :             break;
    1131             :         }
    1132             :     }
    1133             : 
    1134             :     /* re-fill buffer for the caller unless EOF */
    1135           4 :     if (*len >= 0 && (fill_buf || *len == 0)) {
    1136           0 :         bytes = read_from_url(pls, seg, buf + *len, buf_size - *len);
    1137             : 
    1138             :         /* ignore error if we already had some data */
    1139           0 :         if (bytes >= 0)
    1140           0 :             *len += bytes;
    1141           0 :         else if (*len == 0)
    1142           0 :             *len = bytes;
    1143             :     }
    1144             : 
    1145           4 :     if (pls->id3_buf) {
    1146             :         /* Now parse all the ID3 tags */
    1147             :         AVIOContext id3ioctx;
    1148           0 :         ffio_init_context(&id3ioctx, pls->id3_buf, id3_buf_pos, 0, NULL, NULL, NULL, NULL);
    1149           0 :         handle_id3(&id3ioctx, pls);
    1150             :     }
    1151             : 
    1152           4 :     if (pls->is_id3_timestamped == -1)
    1153           4 :         pls->is_id3_timestamped = (pls->id3_mpegts_timestamp != AV_NOPTS_VALUE);
    1154           4 : }
    1155             : 
    1156          14 : static int open_input(HLSContext *c, struct playlist *pls, struct segment *seg, AVIOContext **in)
    1157             : {
    1158          14 :     AVDictionary *opts = NULL;
    1159             :     int ret;
    1160          14 :     int is_http = 0;
    1161             : 
    1162          14 :     if (c->http_persistent)
    1163          14 :         av_dict_set(&opts, "multiple_requests", "1", 0);
    1164             : 
    1165          14 :     if (seg->size >= 0) {
    1166             :         /* try to restrict the HTTP request to the part we want
    1167             :          * (if this is in fact a HTTP request) */
    1168           0 :         av_dict_set_int(&opts, "offset", seg->url_offset, 0);
    1169           0 :         av_dict_set_int(&opts, "end_offset", seg->url_offset + seg->size, 0);
    1170             :     }
    1171             : 
    1172          14 :     av_log(pls->parent, AV_LOG_VERBOSE, "HLS request for url '%s', offset %"PRId64", playlist %d\n",
    1173             :            seg->url, seg->url_offset, pls->index);
    1174             : 
    1175          14 :     if (seg->key_type == KEY_NONE) {
    1176          14 :         ret = open_url(pls->parent, in, seg->url, c->avio_opts, opts, &is_http);
    1177           0 :     } else if (seg->key_type == KEY_AES_128) {
    1178             :         char iv[33], key[33], url[MAX_URL_SIZE];
    1179           0 :         if (strcmp(seg->key, pls->key_url)) {
    1180           0 :             AVIOContext *pb = NULL;
    1181           0 :             if (open_url(pls->parent, &pb, seg->key, c->avio_opts, opts, NULL) == 0) {
    1182           0 :                 ret = avio_read(pb, pls->key, sizeof(pls->key));
    1183           0 :                 if (ret != sizeof(pls->key)) {
    1184           0 :                     av_log(NULL, AV_LOG_ERROR, "Unable to read key file %s\n",
    1185             :                            seg->key);
    1186             :                 }
    1187           0 :                 ff_format_io_close(pls->parent, &pb);
    1188             :             } else {
    1189           0 :                 av_log(NULL, AV_LOG_ERROR, "Unable to open key file %s\n",
    1190             :                        seg->key);
    1191             :             }
    1192           0 :             av_strlcpy(pls->key_url, seg->key, sizeof(pls->key_url));
    1193             :         }
    1194           0 :         ff_data_to_hex(iv, seg->iv, sizeof(seg->iv), 0);
    1195           0 :         ff_data_to_hex(key, pls->key, sizeof(pls->key), 0);
    1196           0 :         iv[32] = key[32] = '\0';
    1197           0 :         if (strstr(seg->url, "://"))
    1198           0 :             snprintf(url, sizeof(url), "crypto+%s", seg->url);
    1199             :         else
    1200           0 :             snprintf(url, sizeof(url), "crypto:%s", seg->url);
    1201             : 
    1202           0 :         av_dict_set(&opts, "key", key, 0);
    1203           0 :         av_dict_set(&opts, "iv", iv, 0);
    1204             : 
    1205           0 :         ret = open_url(pls->parent, in, url, c->avio_opts, opts, &is_http);
    1206           0 :         if (ret < 0) {
    1207           0 :             goto cleanup;
    1208             :         }
    1209           0 :         ret = 0;
    1210           0 :     } else if (seg->key_type == KEY_SAMPLE_AES) {
    1211           0 :         av_log(pls->parent, AV_LOG_ERROR,
    1212             :                "SAMPLE-AES encryption is not supported yet\n");
    1213           0 :         ret = AVERROR_PATCHWELCOME;
    1214             :     }
    1215             :     else
    1216           0 :       ret = AVERROR(ENOSYS);
    1217             : 
    1218             :     /* Seek to the requested position. If this was a HTTP request, the offset
    1219             :      * should already be where want it to, but this allows e.g. local testing
    1220             :      * without a HTTP server.
    1221             :      *
    1222             :      * This is not done for HTTP at all as avio_seek() does internal bookkeeping
    1223             :      * of file offset which is out-of-sync with the actual offset when "offset"
    1224             :      * AVOption is used with http protocol, causing the seek to not be a no-op
    1225             :      * as would be expected. Wrong offset received from the server will not be
    1226             :      * noticed without the call, though.
    1227             :      */
    1228          56 :     if (ret == 0 && !is_http && seg->key_type == KEY_NONE && seg->url_offset) {
    1229           0 :         int64_t seekret = avio_seek(*in, seg->url_offset, SEEK_SET);
    1230           0 :         if (seekret < 0) {
    1231           0 :             av_log(pls->parent, AV_LOG_ERROR, "Unable to seek to offset %"PRId64" of HLS segment '%s'\n", seg->url_offset, seg->url);
    1232           0 :             ret = seekret;
    1233           0 :             ff_format_io_close(pls->parent, in);
    1234             :         }
    1235             :     }
    1236             : 
    1237          28 : cleanup:
    1238          14 :     av_dict_free(&opts);
    1239          14 :     pls->cur_seg_offset = 0;
    1240          14 :     return ret;
    1241             : }
    1242             : 
    1243          14 : static int update_init_section(struct playlist *pls, struct segment *seg)
    1244             : {
    1245             :     static const int max_init_section_size = 1024*1024;
    1246          14 :     HLSContext *c = pls->parent->priv_data;
    1247             :     int64_t sec_size;
    1248             :     int64_t urlsize;
    1249             :     int ret;
    1250             : 
    1251          14 :     if (seg->init_section == pls->cur_init_section)
    1252          14 :         return 0;
    1253             : 
    1254           0 :     pls->cur_init_section = NULL;
    1255             : 
    1256           0 :     if (!seg->init_section)
    1257           0 :         return 0;
    1258             : 
    1259           0 :     ret = open_input(c, pls, seg->init_section, &pls->input);
    1260           0 :     if (ret < 0) {
    1261           0 :         av_log(pls->parent, AV_LOG_WARNING,
    1262             :                "Failed to open an initialization section in playlist %d\n",
    1263             :                pls->index);
    1264           0 :         return ret;
    1265             :     }
    1266             : 
    1267           0 :     if (seg->init_section->size >= 0)
    1268           0 :         sec_size = seg->init_section->size;
    1269           0 :     else if ((urlsize = avio_size(pls->input)) >= 0)
    1270           0 :         sec_size = urlsize;
    1271             :     else
    1272           0 :         sec_size = max_init_section_size;
    1273             : 
    1274           0 :     av_log(pls->parent, AV_LOG_DEBUG,
    1275             :            "Downloading an initialization section of size %"PRId64"\n",
    1276             :            sec_size);
    1277             : 
    1278           0 :     sec_size = FFMIN(sec_size, max_init_section_size);
    1279             : 
    1280           0 :     av_fast_malloc(&pls->init_sec_buf, &pls->init_sec_buf_size, sec_size);
    1281             : 
    1282           0 :     ret = read_from_url(pls, seg->init_section, pls->init_sec_buf,
    1283           0 :                         pls->init_sec_buf_size);
    1284           0 :     ff_format_io_close(pls->parent, &pls->input);
    1285             : 
    1286           0 :     if (ret < 0)
    1287           0 :         return ret;
    1288             : 
    1289           0 :     pls->cur_init_section = seg->init_section;
    1290           0 :     pls->init_sec_data_len = ret;
    1291           0 :     pls->init_sec_buf_read_offset = 0;
    1292             : 
    1293             :     /* spec says audio elementary streams do not have media initialization
    1294             :      * sections, so there should be no ID3 timestamps */
    1295           0 :     pls->is_id3_timestamped = 0;
    1296             : 
    1297           0 :     return 0;
    1298             : }
    1299             : 
    1300          28 : static int64_t default_reload_interval(struct playlist *pls)
    1301             : {
    1302          28 :     return pls->n_segments > 0 ?
    1303          28 :                           pls->segments[pls->n_segments - 1]->duration :
    1304             :                           pls->target_duration;
    1305             : }
    1306             : 
    1307        2490 : static int playlist_needed(struct playlist *pls)
    1308             : {
    1309        2490 :     AVFormatContext *s = pls->parent;
    1310             :     int i, j;
    1311        2490 :     int stream_needed = 0;
    1312             :     int first_st;
    1313             : 
    1314             :     /* If there is no context or streams yet, the playlist is needed */
    1315        2490 :     if (!pls->ctx || !pls->n_main_streams)
    1316           4 :         return 1;
    1317             : 
    1318             :     /* check if any of the streams in the playlist are needed */
    1319        2486 :     for (i = 0; i < pls->n_main_streams; i++) {
    1320        2486 :         if (pls->main_streams[i]->discard < AVDISCARD_ALL) {
    1321        2486 :             stream_needed = 1;
    1322        2486 :             break;
    1323             :         }
    1324             :     }
    1325             : 
    1326             :     /* If all streams in the playlist were discarded, the playlist is not
    1327             :      * needed (regardless of whether whole programs are discarded or not). */
    1328        2486 :     if (!stream_needed)
    1329           0 :         return 0;
    1330             : 
    1331             :     /* Otherwise, check if all the programs (variants) this playlist is in are
    1332             :      * discarded. Since all streams in the playlist are part of the same programs
    1333             :      * we can just check the programs of the first stream. */
    1334             : 
    1335        2486 :     first_st = pls->main_streams[0]->index;
    1336             : 
    1337        2486 :     for (i = 0; i < s->nb_programs; i++) {
    1338        2486 :         AVProgram *program = s->programs[i];
    1339        2486 :         if (program->discard < AVDISCARD_ALL) {
    1340        2486 :             for (j = 0; j < program->nb_stream_indexes; j++) {
    1341        2486 :                 if (program->stream_index[j] == first_st) {
    1342             :                     /* playlist is in an undiscarded program */
    1343        2486 :                     return 1;
    1344             :                 }
    1345             :             }
    1346             :         }
    1347             :     }
    1348             : 
    1349             :     /* some streams were not discarded but all the programs were */
    1350           0 :     return 0;
    1351             : }
    1352             : 
    1353         131 : static int read_data(void *opaque, uint8_t *buf, int buf_size)
    1354             : {
    1355         131 :     struct playlist *v = opaque;
    1356         131 :     HLSContext *c = v->parent->priv_data;
    1357             :     int ret;
    1358         131 :     int just_opened = 0;
    1359         131 :     int reload_count = 0;
    1360             :     struct segment *seg;
    1361             : 
    1362         145 : restart:
    1363         145 :     if (!v->needed)
    1364           0 :         return AVERROR_EOF;
    1365             : 
    1366         145 :     if (!v->input || (c->http_persistent && v->input_read_done)) {
    1367             :         int64_t reload_interval;
    1368             : 
    1369             :         /* Check that the playlist is still needed before opening a new
    1370             :          * segment. */
    1371          28 :         v->needed = playlist_needed(v);
    1372             : 
    1373          28 :         if (!v->needed) {
    1374           0 :             av_log(v->parent, AV_LOG_INFO, "No longer receiving playlist %d\n",
    1375             :                 v->index);
    1376           0 :             return AVERROR_EOF;
    1377             :         }
    1378             : 
    1379             :         /* If this is a live stream and the reload interval has elapsed since
    1380             :          * the last playlist reload, reload the playlists now. */
    1381          28 :         reload_interval = default_reload_interval(v);
    1382             : 
    1383          28 : reload:
    1384          28 :         reload_count++;
    1385          28 :         if (reload_count > c->max_reload)
    1386           0 :             return AVERROR_EOF;
    1387          28 :         if (!v->finished &&
    1388           0 :             av_gettime_relative() - v->last_load_time >= reload_interval) {
    1389           0 :             if ((ret = parse_playlist(c, v->url, v, NULL)) < 0) {
    1390           0 :                 if (ret != AVERROR_EXIT)
    1391           0 :                     av_log(v->parent, AV_LOG_WARNING, "Failed to reload playlist %d\n",
    1392             :                            v->index);
    1393           0 :                 return ret;
    1394             :             }
    1395             :             /* If we need to reload the playlist again below (if
    1396             :              * there's still no more segments), switch to a reload
    1397             :              * interval of half the target duration. */
    1398           0 :             reload_interval = v->target_duration / 2;
    1399             :         }
    1400          28 :         if (v->cur_seq_no < v->start_seq_no) {
    1401           0 :             av_log(NULL, AV_LOG_WARNING,
    1402             :                    "skipping %d segments ahead, expired from playlists\n",
    1403           0 :                    v->start_seq_no - v->cur_seq_no);
    1404           0 :             v->cur_seq_no = v->start_seq_no;
    1405             :         }
    1406          28 :         if (v->cur_seq_no >= v->start_seq_no + v->n_segments) {
    1407          14 :             if (v->finished)
    1408          14 :                 return AVERROR_EOF;
    1409           0 :             while (av_gettime_relative() - v->last_load_time < reload_interval) {
    1410           0 :                 if (ff_check_interrupt(c->interrupt_callback))
    1411           0 :                     return AVERROR_EXIT;
    1412           0 :                 av_usleep(100*1000);
    1413             :             }
    1414             :             /* Enough time has elapsed since the last reload */
    1415           0 :             goto reload;
    1416             :         }
    1417             : 
    1418          14 :         v->input_read_done = 0;
    1419          14 :         seg = current_segment(v);
    1420             : 
    1421             :         /* load/update Media Initialization Section, if any */
    1422          14 :         ret = update_init_section(v, seg);
    1423          14 :         if (ret)
    1424           0 :             return ret;
    1425             : 
    1426          14 :         if (c->http_multiple == 1 && v->input_next_requested) {
    1427           0 :             FFSWAP(AVIOContext *, v->input, v->input_next);
    1428           0 :             v->input_next_requested = 0;
    1429           0 :             ret = 0;
    1430             :         } else {
    1431          14 :             ret = open_input(c, v, seg, &v->input);
    1432             :         }
    1433          14 :         if (ret < 0) {
    1434           0 :             if (ff_check_interrupt(c->interrupt_callback))
    1435           0 :                 return AVERROR_EXIT;
    1436           0 :             av_log(v->parent, AV_LOG_WARNING, "Failed to open segment %d of playlist %d\n",
    1437             :                    v->cur_seq_no,
    1438             :                    v->index);
    1439           0 :             v->cur_seq_no += 1;
    1440           0 :             goto reload;
    1441             :         }
    1442          14 :         just_opened = 1;
    1443             :     }
    1444             : 
    1445         131 :     if (c->http_multiple == -1) {
    1446         131 :         uint8_t *http_version_opt = NULL;
    1447         131 :         int r = av_opt_get(v->input, "http_version", AV_OPT_SEARCH_CHILDREN, &http_version_opt);
    1448         131 :         if (r >= 0) {
    1449           0 :             c->http_multiple = strncmp((const char *)http_version_opt, "1.1", 3) == 0;
    1450           0 :             av_freep(&http_version_opt);
    1451             :         }
    1452             :     }
    1453             : 
    1454         131 :     seg = next_segment(v);
    1455         131 :     if (c->http_multiple == 1 && !v->input_next_requested &&
    1456           0 :         seg && seg->key_type == KEY_NONE && av_strstart(seg->url, "http", NULL)) {
    1457           0 :         ret = open_input(c, v, seg, &v->input_next);
    1458           0 :         if (ret < 0) {
    1459           0 :             if (ff_check_interrupt(c->interrupt_callback))
    1460           0 :                 return AVERROR_EXIT;
    1461           0 :             av_log(v->parent, AV_LOG_WARNING, "Failed to open segment %d of playlist %d\n",
    1462           0 :                    v->cur_seq_no + 1,
    1463             :                    v->index);
    1464             :         } else {
    1465           0 :             v->input_next_requested = 1;
    1466             :         }
    1467             :     }
    1468             : 
    1469         131 :     if (v->init_sec_buf_read_offset < v->init_sec_data_len) {
    1470             :         /* Push init section out first before first actual segment */
    1471           0 :         int copy_size = FFMIN(v->init_sec_data_len - v->init_sec_buf_read_offset, buf_size);
    1472           0 :         memcpy(buf, v->init_sec_buf, copy_size);
    1473           0 :         v->init_sec_buf_read_offset += copy_size;
    1474           0 :         return copy_size;
    1475             :     }
    1476             : 
    1477         131 :     seg = current_segment(v);
    1478         131 :     ret = read_from_url(v, seg, buf, buf_size);
    1479         131 :     if (ret > 0) {
    1480         117 :         if (just_opened && v->is_id3_timestamped != 0) {
    1481             :             /* Intercept ID3 tags here, elementary audio streams are required
    1482             :              * to convey timestamps using them in the beginning of each segment. */
    1483           4 :             intercept_id3(v, buf, buf_size, &ret);
    1484             :         }
    1485             : 
    1486         117 :         return ret;
    1487             :     }
    1488          28 :     if (c->http_persistent &&
    1489          28 :         seg->key_type == KEY_NONE && av_strstart(seg->url, "http", NULL)) {
    1490           0 :         v->input_read_done = 1;
    1491             :     } else {
    1492          14 :         ff_format_io_close(v->parent, &v->input);
    1493             :     }
    1494          14 :     v->cur_seq_no++;
    1495             : 
    1496          14 :     c->cur_seq_no = v->cur_seq_no;
    1497             : 
    1498          14 :     goto restart;
    1499             : }
    1500             : 
    1501           0 : static void add_renditions_to_variant(HLSContext *c, struct variant *var,
    1502             :                                       enum AVMediaType type, const char *group_id)
    1503             : {
    1504             :     int i;
    1505             : 
    1506           0 :     for (i = 0; i < c->n_renditions; i++) {
    1507           0 :         struct rendition *rend = c->renditions[i];
    1508             : 
    1509           0 :         if (rend->type == type && !strcmp(rend->group_id, group_id)) {
    1510             : 
    1511           0 :             if (rend->playlist)
    1512             :                 /* rendition is an external playlist
    1513             :                  * => add the playlist to the variant */
    1514           0 :                 dynarray_add(&var->playlists, &var->n_playlists, rend->playlist);
    1515             :             else
    1516             :                 /* rendition is part of the variant main Media Playlist
    1517             :                  * => add the rendition to the main Media Playlist */
    1518           0 :                 dynarray_add(&var->playlists[0]->renditions,
    1519             :                              &var->playlists[0]->n_renditions,
    1520             :                              rend);
    1521             :         }
    1522             :     }
    1523           0 : }
    1524             : 
    1525          12 : static void add_metadata_from_renditions(AVFormatContext *s, struct playlist *pls,
    1526             :                                          enum AVMediaType type)
    1527             : {
    1528          12 :     int rend_idx = 0;
    1529             :     int i;
    1530             : 
    1531          20 :     for (i = 0; i < pls->n_main_streams; i++) {
    1532          12 :         AVStream *st = pls->main_streams[i];
    1533             : 
    1534          12 :         if (st->codecpar->codec_type != type)
    1535           8 :             continue;
    1536             : 
    1537           4 :         for (; rend_idx < pls->n_renditions; rend_idx++) {
    1538           0 :             struct rendition *rend = pls->renditions[rend_idx];
    1539             : 
    1540           0 :             if (rend->type != type)
    1541           0 :                 continue;
    1542             : 
    1543           0 :             if (rend->language[0])
    1544           0 :                 av_dict_set(&st->metadata, "language", rend->language, 0);
    1545           0 :             if (rend->name[0])
    1546           0 :                 av_dict_set(&st->metadata, "comment", rend->name, 0);
    1547             : 
    1548           0 :             st->disposition |= rend->disposition;
    1549             :         }
    1550           4 :         if (rend_idx >=pls->n_renditions)
    1551           4 :             break;
    1552             :     }
    1553          12 : }
    1554             : 
    1555             : /* if timestamp was in valid range: returns 1 and sets seq_no
    1556             :  * if not: returns 0 and sets seq_no to closest segment */
    1557           0 : static int find_timestamp_in_playlist(HLSContext *c, struct playlist *pls,
    1558             :                                       int64_t timestamp, int *seq_no)
    1559             : {
    1560             :     int i;
    1561           0 :     int64_t pos = c->first_timestamp == AV_NOPTS_VALUE ?
    1562           0 :                   0 : c->first_timestamp;
    1563             : 
    1564           0 :     if (timestamp < pos) {
    1565           0 :         *seq_no = pls->start_seq_no;
    1566           0 :         return 0;
    1567             :     }
    1568             : 
    1569           0 :     for (i = 0; i < pls->n_segments; i++) {
    1570           0 :         int64_t diff = pos + pls->segments[i]->duration - timestamp;
    1571           0 :         if (diff > 0) {
    1572           0 :             *seq_no = pls->start_seq_no + i;
    1573           0 :             return 1;
    1574             :         }
    1575           0 :         pos += pls->segments[i]->duration;
    1576             :     }
    1577             : 
    1578           0 :     *seq_no = pls->start_seq_no + pls->n_segments - 1;
    1579             : 
    1580           0 :     return 0;
    1581             : }
    1582             : 
    1583           4 : static int select_cur_seq_no(HLSContext *c, struct playlist *pls)
    1584             : {
    1585             :     int seq_no;
    1586             : 
    1587           4 :     if (!pls->finished && !c->first_packet &&
    1588           0 :         av_gettime_relative() - pls->last_load_time >= default_reload_interval(pls))
    1589             :         /* reload the playlist since it was suspended */
    1590           0 :         parse_playlist(c, pls->url, pls, NULL);
    1591             : 
    1592             :     /* If playback is already in progress (we are just selecting a new
    1593             :      * playlist) and this is a complete file, find the matching segment
    1594             :      * by counting durations. */
    1595           4 :     if (pls->finished && c->cur_timestamp != AV_NOPTS_VALUE) {
    1596           0 :         find_timestamp_in_playlist(c, pls, c->cur_timestamp, &seq_no);
    1597           0 :         return seq_no;
    1598             :     }
    1599             : 
    1600           4 :     if (!pls->finished) {
    1601           0 :         if (!c->first_packet && /* we are doing a segment selection during playback */
    1602           0 :             c->cur_seq_no >= pls->start_seq_no &&
    1603           0 :             c->cur_seq_no < pls->start_seq_no + pls->n_segments)
    1604             :             /* While spec 3.4.3 says that we cannot assume anything about the
    1605             :              * content at the same sequence number on different playlists,
    1606             :              * in practice this seems to work and doing it otherwise would
    1607             :              * require us to download a segment to inspect its timestamps. */
    1608           0 :             return c->cur_seq_no;
    1609             : 
    1610             :         /* If this is a live stream, start live_start_index segments from the
    1611             :          * start or end */
    1612           0 :         if (c->live_start_index < 0)
    1613           0 :             return pls->start_seq_no + FFMAX(pls->n_segments + c->live_start_index, 0);
    1614             :         else
    1615           0 :             return pls->start_seq_no + FFMIN(c->live_start_index, pls->n_segments - 1);
    1616             :     }
    1617             : 
    1618             :     /* Otherwise just start on the first segment. */
    1619           4 :     return pls->start_seq_no;
    1620             : }
    1621             : 
    1622           4 : static int save_avio_options(AVFormatContext *s)
    1623             : {
    1624           4 :     HLSContext *c = s->priv_data;
    1625             :     static const char * const opts[] = {
    1626             :         "headers", "http_proxy", "user_agent", "cookies", "referer", "rw_timeout", NULL };
    1627           4 :     const char * const * opt = opts;
    1628             :     uint8_t *buf;
    1629           4 :     int ret = 0;
    1630             : 
    1631          32 :     while (*opt) {
    1632          24 :         if (av_opt_get(s->pb, *opt, AV_OPT_SEARCH_CHILDREN | AV_OPT_ALLOW_NULL, &buf) >= 0) {
    1633           4 :             ret = av_dict_set(&c->avio_opts, *opt, buf,
    1634             :                               AV_DICT_DONT_STRDUP_VAL);
    1635           4 :             if (ret < 0)
    1636           0 :                 return ret;
    1637             :         }
    1638          24 :         opt++;
    1639             :     }
    1640             : 
    1641           4 :     return ret;
    1642             : }
    1643             : 
    1644           0 : static int nested_io_open(AVFormatContext *s, AVIOContext **pb, const char *url,
    1645             :                           int flags, AVDictionary **opts)
    1646             : {
    1647           0 :     av_log(s, AV_LOG_ERROR,
    1648             :            "A HLS playlist item '%s' referred to an external file '%s'. "
    1649             :            "Opening this file was forbidden for security reasons\n",
    1650             :            s->url, url);
    1651           0 :     return AVERROR(EPERM);
    1652             : }
    1653             : 
    1654           4 : static void add_stream_to_programs(AVFormatContext *s, struct playlist *pls, AVStream *stream)
    1655             : {
    1656           4 :     HLSContext *c = s->priv_data;
    1657             :     int i, j;
    1658           4 :     int bandwidth = -1;
    1659             : 
    1660           8 :     for (i = 0; i < c->n_variants; i++) {
    1661           4 :         struct variant *v = c->variants[i];
    1662             : 
    1663           8 :         for (j = 0; j < v->n_playlists; j++) {
    1664           4 :             if (v->playlists[j] != pls)
    1665           0 :                 continue;
    1666             : 
    1667           4 :             av_program_add_stream_index(s, i, stream->index);
    1668             : 
    1669           4 :             if (bandwidth < 0)
    1670           4 :                 bandwidth = v->bandwidth;
    1671           0 :             else if (bandwidth != v->bandwidth)
    1672           0 :                 bandwidth = -1; /* stream in multiple variants with different bandwidths */
    1673             :         }
    1674             :     }
    1675             : 
    1676           4 :     if (bandwidth >= 0)
    1677           4 :         av_dict_set_int(&stream->metadata, "variant_bitrate", bandwidth, 0);
    1678           4 : }
    1679             : 
    1680           6 : static int set_stream_info_from_input_stream(AVStream *st, struct playlist *pls, AVStream *ist)
    1681             : {
    1682             :     int err;
    1683             : 
    1684           6 :     err = avcodec_parameters_copy(st->codecpar, ist->codecpar);
    1685           6 :     if (err < 0)
    1686           0 :         return err;
    1687             : 
    1688           6 :     if (pls->is_id3_timestamped) /* custom timestamps via id3 */
    1689           0 :         avpriv_set_pts_info(st, 33, 1, MPEG_TIME_BASE);
    1690             :     else
    1691           6 :         avpriv_set_pts_info(st, ist->pts_wrap_bits, ist->time_base.num, ist->time_base.den);
    1692             : 
    1693           6 :     st->internal->need_context_update = 1;
    1694             : 
    1695           6 :     return 0;
    1696             : }
    1697             : 
    1698             : /* add new subdemuxer streams to our context, if any */
    1699        2462 : static int update_streams_from_subdemuxer(AVFormatContext *s, struct playlist *pls)
    1700             : {
    1701             :     int err;
    1702             : 
    1703        4928 :     while (pls->n_main_streams < pls->ctx->nb_streams) {
    1704           4 :         int ist_idx = pls->n_main_streams;
    1705           4 :         AVStream *st = avformat_new_stream(s, NULL);
    1706           4 :         AVStream *ist = pls->ctx->streams[ist_idx];
    1707             : 
    1708           4 :         if (!st)
    1709           0 :             return AVERROR(ENOMEM);
    1710             : 
    1711           4 :         st->id = pls->index;
    1712           4 :         dynarray_add(&pls->main_streams, &pls->n_main_streams, st);
    1713             : 
    1714           4 :         add_stream_to_programs(s, pls, st);
    1715             : 
    1716           4 :         err = set_stream_info_from_input_stream(st, pls, ist);
    1717           4 :         if (err < 0)
    1718           0 :             return err;
    1719             :     }
    1720             : 
    1721        2462 :     return 0;
    1722             : }
    1723             : 
    1724           7 : static void update_noheader_flag(AVFormatContext *s)
    1725             : {
    1726           7 :     HLSContext *c = s->priv_data;
    1727           7 :     int flag_needed = 0;
    1728             :     int i;
    1729             : 
    1730          11 :     for (i = 0; i < c->n_playlists; i++) {
    1731           7 :         struct playlist *pls = c->playlists[i];
    1732             : 
    1733           7 :         if (pls->has_noheader_flag) {
    1734           3 :             flag_needed = 1;
    1735           3 :             break;
    1736             :         }
    1737             :     }
    1738             : 
    1739           7 :     if (flag_needed)
    1740           3 :         s->ctx_flags |= AVFMTCTX_NOHEADER;
    1741             :     else
    1742           4 :         s->ctx_flags &= ~AVFMTCTX_NOHEADER;
    1743           7 : }
    1744             : 
    1745           4 : static int hls_close(AVFormatContext *s)
    1746             : {
    1747           4 :     HLSContext *c = s->priv_data;
    1748             : 
    1749           4 :     free_playlist_list(c);
    1750           4 :     free_variant_list(c);
    1751           4 :     free_rendition_list(c);
    1752             : 
    1753           4 :     av_dict_free(&c->avio_opts);
    1754           4 :     ff_format_io_close(c->ctx, &c->playlist_pb);
    1755             : 
    1756           4 :     return 0;
    1757             : }
    1758             : 
    1759           4 : static int hls_read_header(AVFormatContext *s)
    1760             : {
    1761           4 :     HLSContext *c = s->priv_data;
    1762           4 :     int ret = 0, i;
    1763           4 :     int highest_cur_seq_no = 0;
    1764             : 
    1765           4 :     c->ctx                = s;
    1766           4 :     c->interrupt_callback = &s->interrupt_callback;
    1767           4 :     c->strict_std_compliance = s->strict_std_compliance;
    1768             : 
    1769           4 :     c->first_packet = 1;
    1770           4 :     c->first_timestamp = AV_NOPTS_VALUE;
    1771           4 :     c->cur_timestamp = AV_NOPTS_VALUE;
    1772             : 
    1773           4 :     if ((ret = save_avio_options(s)) < 0)
    1774           0 :         goto fail;
    1775             : 
    1776             :     /* Some HLS servers don't like being sent the range header */
    1777           4 :     av_dict_set(&c->avio_opts, "seekable", "0", 0);
    1778             : 
    1779           4 :     if ((ret = parse_playlist(c, s->url, NULL, s->pb)) < 0)
    1780           0 :         goto fail;
    1781             : 
    1782           4 :     if (c->n_variants == 0) {
    1783           0 :         av_log(NULL, AV_LOG_WARNING, "Empty playlist\n");
    1784           0 :         ret = AVERROR_EOF;
    1785           0 :         goto fail;
    1786             :     }
    1787             :     /* If the playlist only contained playlists (Master Playlist),
    1788             :      * parse each individual playlist. */
    1789           4 :     if (c->n_playlists > 1 || c->playlists[0]->n_segments == 0) {
    1790           0 :         for (i = 0; i < c->n_playlists; i++) {
    1791           0 :             struct playlist *pls = c->playlists[i];
    1792           0 :             if ((ret = parse_playlist(c, pls->url, pls, NULL)) < 0)
    1793           0 :                 goto fail;
    1794             :         }
    1795             :     }
    1796             : 
    1797           4 :     if (c->variants[0]->playlists[0]->n_segments == 0) {
    1798           0 :         av_log(NULL, AV_LOG_WARNING, "Empty playlist\n");
    1799           0 :         ret = AVERROR_EOF;
    1800           0 :         goto fail;
    1801             :     }
    1802             : 
    1803             :     /* If this isn't a live stream, calculate the total duration of the
    1804             :      * stream. */
    1805           4 :     if (c->variants[0]->playlists[0]->finished) {
    1806           4 :         int64_t duration = 0;
    1807          18 :         for (i = 0; i < c->variants[0]->playlists[0]->n_segments; i++)
    1808          14 :             duration += c->variants[0]->playlists[0]->segments[i]->duration;
    1809           4 :         s->duration = duration;
    1810             :     }
    1811             : 
    1812             :     /* Associate renditions with variants */
    1813           8 :     for (i = 0; i < c->n_variants; i++) {
    1814           4 :         struct variant *var = c->variants[i];
    1815             : 
    1816           4 :         if (var->audio_group[0])
    1817           0 :             add_renditions_to_variant(c, var, AVMEDIA_TYPE_AUDIO, var->audio_group);
    1818           4 :         if (var->video_group[0])
    1819           0 :             add_renditions_to_variant(c, var, AVMEDIA_TYPE_VIDEO, var->video_group);
    1820           4 :         if (var->subtitles_group[0])
    1821           0 :             add_renditions_to_variant(c, var, AVMEDIA_TYPE_SUBTITLE, var->subtitles_group);
    1822             :     }
    1823             : 
    1824             :     /* Create a program for each variant */
    1825           8 :     for (i = 0; i < c->n_variants; i++) {
    1826           4 :         struct variant *v = c->variants[i];
    1827             :         AVProgram *program;
    1828             : 
    1829           4 :         program = av_new_program(s, i);
    1830           4 :         if (!program)
    1831           0 :             goto fail;
    1832           4 :         av_dict_set_int(&program->metadata, "variant_bitrate", v->bandwidth, 0);
    1833             :     }
    1834             : 
    1835             :     /* Select the starting segments */
    1836           8 :     for (i = 0; i < c->n_playlists; i++) {
    1837           4 :         struct playlist *pls = c->playlists[i];
    1838             : 
    1839           4 :         if (pls->n_segments == 0)
    1840           0 :             continue;
    1841             : 
    1842           4 :         pls->cur_seq_no = select_cur_seq_no(c, pls);
    1843           4 :         highest_cur_seq_no = FFMAX(highest_cur_seq_no, pls->cur_seq_no);
    1844             :     }
    1845             : 
    1846             :     /* Open the demuxer for each playlist */
    1847           8 :     for (i = 0; i < c->n_playlists; i++) {
    1848           4 :         struct playlist *pls = c->playlists[i];
    1849           4 :         AVInputFormat *in_fmt = NULL;
    1850             : 
    1851           4 :         if (!(pls->ctx = avformat_alloc_context())) {
    1852           0 :             ret = AVERROR(ENOMEM);
    1853           0 :             goto fail;
    1854             :         }
    1855             : 
    1856           4 :         if (pls->n_segments == 0)
    1857           0 :             continue;
    1858             : 
    1859           4 :         pls->index  = i;
    1860           4 :         pls->needed = 1;
    1861           4 :         pls->parent = s;
    1862             : 
    1863             :         /*
    1864             :          * If this is a live stream and this playlist looks like it is one segment
    1865             :          * behind, try to sync it up so that every substream starts at the same
    1866             :          * time position (so e.g. avformat_find_stream_info() will see packets from
    1867             :          * all active streams within the first few seconds). This is not very generic,
    1868             :          * though, as the sequence numbers are technically independent.
    1869             :          */
    1870           4 :         if (!pls->finished && pls->cur_seq_no == highest_cur_seq_no - 1 &&
    1871           0 :             highest_cur_seq_no < pls->start_seq_no + pls->n_segments) {
    1872           0 :             pls->cur_seq_no = highest_cur_seq_no;
    1873             :         }
    1874             : 
    1875           4 :         pls->read_buffer = av_malloc(INITIAL_BUFFER_SIZE);
    1876           4 :         if (!pls->read_buffer){
    1877           0 :             ret = AVERROR(ENOMEM);
    1878           0 :             avformat_free_context(pls->ctx);
    1879           0 :             pls->ctx = NULL;
    1880           0 :             goto fail;
    1881             :         }
    1882           4 :         ffio_init_context(&pls->pb, pls->read_buffer, INITIAL_BUFFER_SIZE, 0, pls,
    1883             :                           read_data, NULL, NULL);
    1884           4 :         pls->pb.seekable = 0;
    1885           4 :         ret = av_probe_input_buffer(&pls->pb, &in_fmt, pls->segments[0]->url,
    1886             :                                     NULL, 0, 0);
    1887           4 :         if (ret < 0) {
    1888             :             /* Free the ctx - it isn't initialized properly at this point,
    1889             :              * so avformat_close_input shouldn't be called. If
    1890             :              * avformat_open_input fails below, it frees and zeros the
    1891             :              * context, so it doesn't need any special treatment like this. */
    1892           0 :             av_log(s, AV_LOG_ERROR, "Error when loading first segment '%s'\n", pls->segments[0]->url);
    1893           0 :             avformat_free_context(pls->ctx);
    1894           0 :             pls->ctx = NULL;
    1895           0 :             goto fail;
    1896             :         }
    1897           4 :         pls->ctx->pb       = &pls->pb;
    1898           4 :         pls->ctx->io_open  = nested_io_open;
    1899           4 :         pls->ctx->flags   |= s->flags & ~AVFMT_FLAG_CUSTOM_IO;
    1900             : 
    1901           4 :         if ((ret = ff_copy_whiteblacklists(pls->ctx, s)) < 0)
    1902           0 :             goto fail;
    1903             : 
    1904           4 :         ret = avformat_open_input(&pls->ctx, pls->segments[0]->url, in_fmt, NULL);
    1905           4 :         if (ret < 0)
    1906           0 :             goto fail;
    1907             : 
    1908           4 :         if (pls->id3_deferred_extra && pls->ctx->nb_streams == 1) {
    1909           0 :             ff_id3v2_parse_apic(pls->ctx, &pls->id3_deferred_extra);
    1910           0 :             avformat_queue_attached_pictures(pls->ctx);
    1911           0 :             ff_id3v2_parse_priv(pls->ctx, &pls->id3_deferred_extra);
    1912           0 :             ff_id3v2_free_extra_meta(&pls->id3_deferred_extra);
    1913           0 :             pls->id3_deferred_extra = NULL;
    1914             :         }
    1915             : 
    1916           4 :         if (pls->is_id3_timestamped == -1)
    1917           0 :             av_log(s, AV_LOG_WARNING, "No expected HTTP requests have been made\n");
    1918             : 
    1919             :         /*
    1920             :          * For ID3 timestamped raw audio streams we need to detect the packet
    1921             :          * durations to calculate timestamps in fill_timing_for_id3_timestamped_stream(),
    1922             :          * but for other streams we can rely on our user calling avformat_find_stream_info()
    1923             :          * on us if they want to.
    1924             :          */
    1925           4 :         if (pls->is_id3_timestamped) {
    1926           0 :             ret = avformat_find_stream_info(pls->ctx, NULL);
    1927           0 :             if (ret < 0)
    1928           0 :                 goto fail;
    1929             :         }
    1930             : 
    1931           4 :         pls->has_noheader_flag = !!(pls->ctx->ctx_flags & AVFMTCTX_NOHEADER);
    1932             : 
    1933             :         /* Create new AVStreams for each stream in this playlist */
    1934           4 :         ret = update_streams_from_subdemuxer(s, pls);
    1935           4 :         if (ret < 0)
    1936           0 :             goto fail;
    1937             : 
    1938             :         /*
    1939             :          * Copy any metadata from playlist to main streams, but do not set
    1940             :          * event flags.
    1941             :          */
    1942           4 :         if (pls->n_main_streams)
    1943           4 :             av_dict_copy(&pls->main_streams[0]->metadata, pls->ctx->metadata, 0);
    1944             : 
    1945           4 :         add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_AUDIO);
    1946           4 :         add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_VIDEO);
    1947           4 :         add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_SUBTITLE);
    1948             :     }
    1949             : 
    1950           4 :     update_noheader_flag(s);
    1951             : 
    1952           4 :     return 0;
    1953           0 : fail:
    1954           0 :     hls_close(s);
    1955           0 :     return ret;
    1956             : }
    1957             : 
    1958        2462 : static int recheck_discard_flags(AVFormatContext *s, int first)
    1959             : {
    1960        2462 :     HLSContext *c = s->priv_data;
    1961        2462 :     int i, changed = 0;
    1962             :     int cur_needed;
    1963             : 
    1964             :     /* Check if any new streams are needed */
    1965        4924 :     for (i = 0; i < c->n_playlists; i++) {
    1966        2462 :         struct playlist *pls = c->playlists[i];
    1967             : 
    1968        2462 :         cur_needed = playlist_needed(c->playlists[i]);
    1969             : 
    1970        2462 :         if (cur_needed && !pls->needed) {
    1971           0 :             pls->needed = 1;
    1972           0 :             changed = 1;
    1973           0 :             pls->cur_seq_no = select_cur_seq_no(c, pls);
    1974           0 :             pls->pb.eof_reached = 0;
    1975           0 :             if (c->cur_timestamp != AV_NOPTS_VALUE) {
    1976             :                 /* catch up */
    1977           0 :                 pls->seek_timestamp = c->cur_timestamp;
    1978           0 :                 pls->seek_flags = AVSEEK_FLAG_ANY;
    1979           0 :                 pls->seek_stream_index = -1;
    1980             :             }
    1981           0 :             av_log(s, AV_LOG_INFO, "Now receiving playlist %d, segment %d\n", i, pls->cur_seq_no);
    1982        2462 :         } else if (first && !cur_needed && pls->needed) {
    1983           0 :             if (pls->input)
    1984           0 :                 ff_format_io_close(pls->parent, &pls->input);
    1985           0 :             pls->input_read_done = 0;
    1986           0 :             if (pls->input_next)
    1987           0 :                 ff_format_io_close(pls->parent, &pls->input_next);
    1988           0 :             pls->input_next_requested = 0;
    1989           0 :             pls->needed = 0;
    1990           0 :             changed = 1;
    1991           0 :             av_log(s, AV_LOG_INFO, "No longer receiving playlist %d\n", i);
    1992             :         }
    1993             :     }
    1994        2462 :     return changed;
    1995             : }
    1996             : 
    1997           0 : static void fill_timing_for_id3_timestamped_stream(struct playlist *pls)
    1998             : {
    1999           0 :     if (pls->id3_offset >= 0) {
    2000           0 :         pls->pkt.dts = pls->id3_mpegts_timestamp +
    2001           0 :                                  av_rescale_q(pls->id3_offset,
    2002           0 :                                               pls->ctx->streams[pls->pkt.stream_index]->time_base,
    2003           0 :                                               MPEG_TIME_BASE_Q);
    2004           0 :         if (pls->pkt.duration)
    2005           0 :             pls->id3_offset += pls->pkt.duration;
    2006             :         else
    2007           0 :             pls->id3_offset = -1;
    2008             :     } else {
    2009             :         /* there have been packets with unknown duration
    2010             :          * since the last id3 tag, should not normally happen */
    2011           0 :         pls->pkt.dts = AV_NOPTS_VALUE;
    2012             :     }
    2013             : 
    2014           0 :     if (pls->pkt.duration)
    2015           0 :         pls->pkt.duration = av_rescale_q(pls->pkt.duration,
    2016           0 :                                          pls->ctx->streams[pls->pkt.stream_index]->time_base,
    2017           0 :                                          MPEG_TIME_BASE_Q);
    2018             : 
    2019           0 :     pls->pkt.pts = AV_NOPTS_VALUE;
    2020           0 : }
    2021             : 
    2022           4 : static AVRational get_timebase(struct playlist *pls)
    2023             : {
    2024           4 :     if (pls->is_id3_timestamped)
    2025           0 :         return MPEG_TIME_BASE_Q;
    2026             : 
    2027           4 :     return pls->ctx->streams[pls->pkt.stream_index]->time_base;
    2028             : }
    2029             : 
    2030           0 : static int compare_ts_with_wrapdetect(int64_t ts_a, struct playlist *pls_a,
    2031             :                                       int64_t ts_b, struct playlist *pls_b)
    2032             : {
    2033           0 :     int64_t scaled_ts_a = av_rescale_q(ts_a, get_timebase(pls_a), MPEG_TIME_BASE_Q);
    2034           0 :     int64_t scaled_ts_b = av_rescale_q(ts_b, get_timebase(pls_b), MPEG_TIME_BASE_Q);
    2035             : 
    2036           0 :     return av_compare_mod(scaled_ts_a, scaled_ts_b, 1LL << 33);
    2037             : }
    2038             : 
    2039        2462 : static int hls_read_packet(AVFormatContext *s, AVPacket *pkt)
    2040             : {
    2041        2462 :     HLSContext *c = s->priv_data;
    2042        2462 :     int ret, i, minplaylist = -1;
    2043             : 
    2044        2462 :     recheck_discard_flags(s, c->first_packet);
    2045        2462 :     c->first_packet = 0;
    2046             : 
    2047        4924 :     for (i = 0; i < c->n_playlists; i++) {
    2048        2462 :         struct playlist *pls = c->playlists[i];
    2049             :         /* Make sure we've got one buffered packet from each open playlist
    2050             :          * stream */
    2051        2462 :         if (pls->needed && !pls->pkt.data) {
    2052           0 :             while (1) {
    2053             :                 int64_t ts_diff;
    2054             :                 AVRational tb;
    2055        2462 :                 ret = av_read_frame(pls->ctx, &pls->pkt);
    2056        2462 :                 if (ret < 0) {
    2057           4 :                     if (!avio_feof(&pls->pb) && ret != AVERROR_EOF)
    2058           0 :                         return ret;
    2059           4 :                     reset_packet(&pls->pkt);
    2060           4 :                     break;
    2061             :                 } else {
    2062             :                     /* stream_index check prevents matching picture attachments etc. */
    2063        2458 :                     if (pls->is_id3_timestamped && pls->pkt.stream_index == 0) {
    2064             :                         /* audio elementary streams are id3 timestamped */
    2065           0 :                         fill_timing_for_id3_timestamped_stream(pls);
    2066             :                     }
    2067             : 
    2068        2462 :                     if (c->first_timestamp == AV_NOPTS_VALUE &&
    2069           4 :                         pls->pkt.dts       != AV_NOPTS_VALUE)
    2070           4 :                         c->first_timestamp = av_rescale_q(pls->pkt.dts,
    2071           4 :                             get_timebase(pls), AV_TIME_BASE_Q);
    2072             :                 }
    2073             : 
    2074        2458 :                 if (pls->seek_timestamp == AV_NOPTS_VALUE)
    2075        2458 :                     break;
    2076             : 
    2077           0 :                 if (pls->seek_stream_index < 0 ||
    2078           0 :                     pls->seek_stream_index == pls->pkt.stream_index) {
    2079             : 
    2080           0 :                     if (pls->pkt.dts == AV_NOPTS_VALUE) {
    2081           0 :                         pls->seek_timestamp = AV_NOPTS_VALUE;
    2082           0 :                         break;
    2083             :                     }
    2084             : 
    2085           0 :                     tb = get_timebase(pls);
    2086           0 :                     ts_diff = av_rescale_rnd(pls->pkt.dts, AV_TIME_BASE,
    2087           0 :                                             tb.den, AV_ROUND_DOWN) -
    2088           0 :                             pls->seek_timestamp;
    2089           0 :                     if (ts_diff >= 0 && (pls->seek_flags  & AVSEEK_FLAG_ANY ||
    2090           0 :                                         pls->pkt.flags & AV_PKT_FLAG_KEY)) {
    2091           0 :                         pls->seek_timestamp = AV_NOPTS_VALUE;
    2092           0 :                         break;
    2093             :                     }
    2094             :                 }
    2095           0 :                 av_packet_unref(&pls->pkt);
    2096           0 :                 reset_packet(&pls->pkt);
    2097             :             }
    2098             :         }
    2099             :         /* Check if this stream has the packet with the lowest dts */
    2100        2462 :         if (pls->pkt.data) {
    2101        2458 :             struct playlist *minpls = minplaylist < 0 ?
    2102        2458 :                                      NULL : c->playlists[minplaylist];
    2103        2458 :             if (minplaylist < 0) {
    2104        2458 :                 minplaylist = i;
    2105             :             } else {
    2106           0 :                 int64_t dts     =    pls->pkt.dts;
    2107           0 :                 int64_t mindts  = minpls->pkt.dts;
    2108             : 
    2109           0 :                 if (dts == AV_NOPTS_VALUE ||
    2110           0 :                     (mindts != AV_NOPTS_VALUE && compare_ts_with_wrapdetect(dts, pls, mindts, minpls) < 0))
    2111           0 :                     minplaylist = i;
    2112             :             }
    2113             :         }
    2114             :     }
    2115             : 
    2116             :     /* If we got a packet, return it */
    2117        2462 :     if (minplaylist >= 0) {
    2118        2458 :         struct playlist *pls = c->playlists[minplaylist];
    2119             :         AVStream *ist;
    2120             :         AVStream *st;
    2121             : 
    2122        2458 :         ret = update_streams_from_subdemuxer(s, pls);
    2123        2458 :         if (ret < 0) {
    2124           0 :             av_packet_unref(&pls->pkt);
    2125           0 :             reset_packet(&pls->pkt);
    2126           0 :             return ret;
    2127             :         }
    2128             : 
    2129             :         // If sub-demuxer reports updated metadata, copy it to the first stream
    2130             :         // and set its AVSTREAM_EVENT_FLAG_METADATA_UPDATED flag.
    2131        2458 :         if (pls->ctx->event_flags & AVFMT_EVENT_FLAG_METADATA_UPDATED) {
    2132           0 :             if (pls->n_main_streams) {
    2133           0 :                 st = pls->main_streams[0];
    2134           0 :                 av_dict_copy(&st->metadata, pls->ctx->metadata, 0);
    2135           0 :                 st->event_flags |= AVSTREAM_EVENT_FLAG_METADATA_UPDATED;
    2136             :             }
    2137           0 :             pls->ctx->event_flags &= ~AVFMT_EVENT_FLAG_METADATA_UPDATED;
    2138             :         }
    2139             : 
    2140             :         /* check if noheader flag has been cleared by the subdemuxer */
    2141        2458 :         if (pls->has_noheader_flag && !(pls->ctx->ctx_flags & AVFMTCTX_NOHEADER)) {
    2142           3 :             pls->has_noheader_flag = 0;
    2143           3 :             update_noheader_flag(s);
    2144             :         }
    2145             : 
    2146        2458 :         if (pls->pkt.stream_index >= pls->n_main_streams) {
    2147           0 :             av_log(s, AV_LOG_ERROR, "stream index inconsistency: index %d, %d main streams, %d subdemuxer streams\n",
    2148           0 :                    pls->pkt.stream_index, pls->n_main_streams, pls->ctx->nb_streams);
    2149           0 :             av_packet_unref(&pls->pkt);
    2150           0 :             reset_packet(&pls->pkt);
    2151           0 :             return AVERROR_BUG;
    2152             :         }
    2153             : 
    2154        2458 :         ist = pls->ctx->streams[pls->pkt.stream_index];
    2155        2458 :         st = pls->main_streams[pls->pkt.stream_index];
    2156             : 
    2157        2458 :         *pkt = pls->pkt;
    2158        2458 :         pkt->stream_index = st->index;
    2159        2458 :         reset_packet(&c->playlists[minplaylist]->pkt);
    2160             : 
    2161        2458 :         if (pkt->dts != AV_NOPTS_VALUE)
    2162        2458 :             c->cur_timestamp = av_rescale_q(pkt->dts,
    2163             :                                             ist->time_base,
    2164        2458 :                                             AV_TIME_BASE_Q);
    2165             : 
    2166             :         /* There may be more situations where this would be useful, but this at least
    2167             :          * handles newly probed codecs properly (i.e. request_probe by mpegts). */
    2168        2458 :         if (ist->codecpar->codec_id != st->codecpar->codec_id) {
    2169           2 :             ret = set_stream_info_from_input_stream(st, pls, ist);
    2170           2 :             if (ret < 0) {
    2171           0 :                 av_packet_unref(pkt);
    2172           0 :                 return ret;
    2173             :             }
    2174             :         }
    2175             : 
    2176        2458 :         return 0;
    2177             :     }
    2178           4 :     return AVERROR_EOF;
    2179             : }
    2180             : 
    2181           0 : static int hls_read_seek(AVFormatContext *s, int stream_index,
    2182             :                                int64_t timestamp, int flags)
    2183             : {
    2184           0 :     HLSContext *c = s->priv_data;
    2185           0 :     struct playlist *seek_pls = NULL;
    2186             :     int i, seq_no;
    2187             :     int j;
    2188             :     int stream_subdemuxer_index;
    2189             :     int64_t first_timestamp, seek_timestamp, duration;
    2190             : 
    2191           0 :     if ((flags & AVSEEK_FLAG_BYTE) || (c->ctx->ctx_flags & AVFMTCTX_UNSEEKABLE))
    2192           0 :         return AVERROR(ENOSYS);
    2193             : 
    2194           0 :     first_timestamp = c->first_timestamp == AV_NOPTS_VALUE ?
    2195           0 :                       0 : c->first_timestamp;
    2196             : 
    2197           0 :     seek_timestamp = av_rescale_rnd(timestamp, AV_TIME_BASE,
    2198           0 :                                     s->streams[stream_index]->time_base.den,
    2199           0 :                                     flags & AVSEEK_FLAG_BACKWARD ?
    2200             :                                     AV_ROUND_DOWN : AV_ROUND_UP);
    2201             : 
    2202           0 :     duration = s->duration == AV_NOPTS_VALUE ?
    2203           0 :                0 : s->duration;
    2204             : 
    2205           0 :     if (0 < duration && duration < seek_timestamp - first_timestamp)
    2206           0 :         return AVERROR(EIO);
    2207             : 
    2208             :     /* find the playlist with the specified stream */
    2209           0 :     for (i = 0; i < c->n_playlists; i++) {
    2210           0 :         struct playlist *pls = c->playlists[i];
    2211           0 :         for (j = 0; j < pls->n_main_streams; j++) {
    2212           0 :             if (pls->main_streams[j] == s->streams[stream_index]) {
    2213           0 :                 seek_pls = pls;
    2214           0 :                 stream_subdemuxer_index = j;
    2215           0 :                 break;
    2216             :             }
    2217             :         }
    2218             :     }
    2219             :     /* check if the timestamp is valid for the playlist with the
    2220             :      * specified stream index */
    2221           0 :     if (!seek_pls || !find_timestamp_in_playlist(c, seek_pls, seek_timestamp, &seq_no))
    2222           0 :         return AVERROR(EIO);
    2223             : 
    2224             :     /* set segment now so we do not need to search again below */
    2225           0 :     seek_pls->cur_seq_no = seq_no;
    2226           0 :     seek_pls->seek_stream_index = stream_subdemuxer_index;
    2227             : 
    2228           0 :     for (i = 0; i < c->n_playlists; i++) {
    2229             :         /* Reset reading */
    2230           0 :         struct playlist *pls = c->playlists[i];
    2231           0 :         if (pls->input)
    2232           0 :             ff_format_io_close(pls->parent, &pls->input);
    2233           0 :         pls->input_read_done = 0;
    2234           0 :         if (pls->input_next)
    2235           0 :             ff_format_io_close(pls->parent, &pls->input_next);
    2236           0 :         pls->input_next_requested = 0;
    2237           0 :         av_packet_unref(&pls->pkt);
    2238           0 :         reset_packet(&pls->pkt);
    2239           0 :         pls->pb.eof_reached = 0;
    2240             :         /* Clear any buffered data */
    2241           0 :         pls->pb.buf_end = pls->pb.buf_ptr = pls->pb.buffer;
    2242             :         /* Reset the pos, to let the mpegts demuxer know we've seeked. */
    2243           0 :         pls->pb.pos = 0;
    2244             :         /* Flush the packet queue of the subdemuxer. */
    2245           0 :         ff_read_frame_flush(pls->ctx);
    2246             : 
    2247           0 :         pls->seek_timestamp = seek_timestamp;
    2248           0 :         pls->seek_flags = flags;
    2249             : 
    2250           0 :         if (pls != seek_pls) {
    2251             :             /* set closest segment seq_no for playlists not handled above */
    2252           0 :             find_timestamp_in_playlist(c, pls, seek_timestamp, &pls->cur_seq_no);
    2253             :             /* seek the playlist to the given position without taking
    2254             :              * keyframes into account since this playlist does not have the
    2255             :              * specified stream where we should look for the keyframes */
    2256           0 :             pls->seek_stream_index = -1;
    2257           0 :             pls->seek_flags |= AVSEEK_FLAG_ANY;
    2258             :         }
    2259             :     }
    2260             : 
    2261           0 :     c->cur_timestamp = seek_timestamp;
    2262             : 
    2263           0 :     return 0;
    2264             : }
    2265             : 
    2266        6217 : static int hls_probe(AVProbeData *p)
    2267             : {
    2268             :     /* Require #EXTM3U at the start, and either one of the ones below
    2269             :      * somewhere for a proper match. */
    2270        6217 :     if (strncmp(p->buf, "#EXTM3U", 7))
    2271        6213 :         return 0;
    2272             : 
    2273           8 :     if (strstr(p->buf, "#EXT-X-STREAM-INF:")     ||
    2274           4 :         strstr(p->buf, "#EXT-X-TARGETDURATION:") ||
    2275           0 :         strstr(p->buf, "#EXT-X-MEDIA-SEQUENCE:"))
    2276           4 :         return AVPROBE_SCORE_MAX;
    2277           0 :     return 0;
    2278             : }
    2279             : 
    2280             : #define OFFSET(x) offsetof(HLSContext, x)
    2281             : #define FLAGS AV_OPT_FLAG_DECODING_PARAM
    2282             : static const AVOption hls_options[] = {
    2283             :     {"live_start_index", "segment index to start live streams at (negative values are from the end)",
    2284             :         OFFSET(live_start_index), AV_OPT_TYPE_INT, {.i64 = -3}, INT_MIN, INT_MAX, FLAGS},
    2285             :     {"allowed_extensions", "List of file extensions that hls is allowed to access",
    2286             :         OFFSET(allowed_extensions), AV_OPT_TYPE_STRING,
    2287             :         {.str = "3gp,aac,avi,flac,mkv,m3u8,m4a,m4s,m4v,mpg,mov,mp2,mp3,mp4,mpeg,mpegts,ogg,ogv,oga,ts,vob,wav"},
    2288             :         INT_MIN, INT_MAX, FLAGS},
    2289             :     {"max_reload", "Maximum number of times a insufficient list is attempted to be reloaded",
    2290             :         OFFSET(max_reload), AV_OPT_TYPE_INT, {.i64 = 1000}, 0, INT_MAX, FLAGS},
    2291             :     {"http_persistent", "Use persistent HTTP connections",
    2292             :         OFFSET(http_persistent), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, FLAGS },
    2293             :     {"http_multiple", "Use multiple HTTP connections for fetching segments",
    2294             :         OFFSET(http_multiple), AV_OPT_TYPE_BOOL, {.i64 = -1}, -1, 1, FLAGS},
    2295             :     {NULL}
    2296             : };
    2297             : 
    2298             : static const AVClass hls_class = {
    2299             :     .class_name = "hls,applehttp",
    2300             :     .item_name  = av_default_item_name,
    2301             :     .option     = hls_options,
    2302             :     .version    = LIBAVUTIL_VERSION_INT,
    2303             : };
    2304             : 
    2305             : AVInputFormat ff_hls_demuxer = {
    2306             :     .name           = "hls,applehttp",
    2307             :     .long_name      = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"),
    2308             :     .priv_class     = &hls_class,
    2309             :     .priv_data_size = sizeof(HLSContext),
    2310             :     .flags          = AVFMT_NOGENSEARCH,
    2311             :     .read_probe     = hls_probe,
    2312             :     .read_header    = hls_read_header,
    2313             :     .read_packet    = hls_read_packet,
    2314             :     .read_close     = hls_close,
    2315             :     .read_seek      = hls_read_seek,
    2316             : };

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