LCOV - code coverage report
Current view: top level - libavformat - hls.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 497 1121 44.3 %
Date: 2017-12-16 13:57:32 Functions: 34 49 69.4 %

          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 "libavutil/avstring.h"
      30             : #include "libavutil/avassert.h"
      31             : #include "libavutil/intreadwrite.h"
      32             : #include "libavutil/mathematics.h"
      33             : #include "libavutil/opt.h"
      34             : #include "libavutil/dict.h"
      35             : #include "libavutil/time.h"
      36             : #include "avformat.h"
      37             : #include "internal.h"
      38             : #include "avio_internal.h"
      39             : #include "id3v2.h"
      40             : 
      41             : #define INITIAL_BUFFER_SIZE 32768
      42             : 
      43             : #define MAX_FIELD_LEN 64
      44             : #define MAX_CHARACTERISTICS_LEN 512
      45             : 
      46             : #define MPEG_TIME_BASE 90000
      47             : #define MPEG_TIME_BASE_Q (AVRational){1, MPEG_TIME_BASE}
      48             : 
      49             : /*
      50             :  * An apple http stream consists of a playlist with media segment files,
      51             :  * played sequentially. There may be several playlists with the same
      52             :  * video content, in different bandwidth variants, that are played in
      53             :  * parallel (preferably only one bandwidth variant at a time). In this case,
      54             :  * the user supplied the url to a main playlist that only lists the variant
      55             :  * playlists.
      56             :  *
      57             :  * If the main playlist doesn't point at any variants, we still create
      58             :  * one anonymous toplevel variant for this, to maintain the structure.
      59             :  */
      60             : 
      61             : enum KeyType {
      62             :     KEY_NONE,
      63             :     KEY_AES_128,
      64             :     KEY_SAMPLE_AES
      65             : };
      66             : 
      67             : struct segment {
      68             :     int64_t duration;
      69             :     int64_t url_offset;
      70             :     int64_t size;
      71             :     char *url;
      72             :     char *key;
      73             :     enum KeyType key_type;
      74             :     uint8_t iv[16];
      75             :     /* associated Media Initialization Section, treated as a segment */
      76             :     struct segment *init_section;
      77             : };
      78             : 
      79             : struct rendition;
      80             : 
      81             : enum PlaylistType {
      82             :     PLS_TYPE_UNSPECIFIED,
      83             :     PLS_TYPE_EVENT,
      84             :     PLS_TYPE_VOD
      85             : };
      86             : 
      87             : /*
      88             :  * Each playlist has its own demuxer. If it currently is active,
      89             :  * it has an open AVIOContext too, and potentially an AVPacket
      90             :  * containing the next packet from this stream.
      91             :  */
      92             : struct playlist {
      93             :     char url[MAX_URL_SIZE];
      94             :     AVIOContext pb;
      95             :     uint8_t* read_buffer;
      96             :     AVIOContext *input;
      97             :     AVFormatContext *parent;
      98             :     int index;
      99             :     AVFormatContext *ctx;
     100             :     AVPacket pkt;
     101             :     int has_noheader_flag;
     102             : 
     103             :     /* main demuxer streams associated with this playlist
     104             :      * indexed by the subdemuxer stream indexes */
     105             :     AVStream **main_streams;
     106             :     int n_main_streams;
     107             : 
     108             :     int finished;
     109             :     enum PlaylistType type;
     110             :     int64_t target_duration;
     111             :     int start_seq_no;
     112             :     int n_segments;
     113             :     struct segment **segments;
     114             :     int needed;
     115             :     int cur_seq_no;
     116             :     int64_t cur_seg_offset;
     117             :     int64_t last_load_time;
     118             : 
     119             :     /* Currently active Media Initialization Section */
     120             :     struct segment *cur_init_section;
     121             :     uint8_t *init_sec_buf;
     122             :     unsigned int init_sec_buf_size;
     123             :     unsigned int init_sec_data_len;
     124             :     unsigned int init_sec_buf_read_offset;
     125             : 
     126             :     char key_url[MAX_URL_SIZE];
     127             :     uint8_t key[16];
     128             : 
     129             :     /* ID3 timestamp handling (elementary audio streams have ID3 timestamps
     130             :      * (and possibly other ID3 tags) in the beginning of each segment) */
     131             :     int is_id3_timestamped; /* -1: not yet known */
     132             :     int64_t id3_mpegts_timestamp; /* in mpegts tb */
     133             :     int64_t id3_offset; /* in stream original tb */
     134             :     uint8_t* id3_buf; /* temp buffer for id3 parsing */
     135             :     unsigned int id3_buf_size;
     136             :     AVDictionary *id3_initial; /* data from first id3 tag */
     137             :     int id3_found; /* ID3 tag found at some point */
     138             :     int id3_changed; /* ID3 tag data has changed at some point */
     139             :     ID3v2ExtraMeta *id3_deferred_extra; /* stored here until subdemuxer is opened */
     140             : 
     141             :     int64_t seek_timestamp;
     142             :     int seek_flags;
     143             :     int seek_stream_index; /* into subdemuxer stream array */
     144             : 
     145             :     /* Renditions associated with this playlist, if any.
     146             :      * Alternative rendition playlists have a single rendition associated
     147             :      * with them, and variant main Media Playlists may have
     148             :      * multiple (playlist-less) renditions associated with them. */
     149             :     int n_renditions;
     150             :     struct rendition **renditions;
     151             : 
     152             :     /* Media Initialization Sections (EXT-X-MAP) associated with this
     153             :      * playlist, if any. */
     154             :     int n_init_sections;
     155             :     struct segment **init_sections;
     156             : };
     157             : 
     158             : /*
     159             :  * Renditions are e.g. alternative subtitle or audio streams.
     160             :  * The rendition may either be an external playlist or it may be
     161             :  * contained in the main Media Playlist of the variant (in which case
     162             :  * playlist is NULL).
     163             :  */
     164             : struct rendition {
     165             :     enum AVMediaType type;
     166             :     struct playlist *playlist;
     167             :     char group_id[MAX_FIELD_LEN];
     168             :     char language[MAX_FIELD_LEN];
     169             :     char name[MAX_FIELD_LEN];
     170             :     int disposition;
     171             : };
     172             : 
     173             : struct variant {
     174             :     int bandwidth;
     175             : 
     176             :     /* every variant contains at least the main Media Playlist in index 0 */
     177             :     int n_playlists;
     178             :     struct playlist **playlists;
     179             : 
     180             :     char audio_group[MAX_FIELD_LEN];
     181             :     char video_group[MAX_FIELD_LEN];
     182             :     char subtitles_group[MAX_FIELD_LEN];
     183             : };
     184             : 
     185             : typedef struct HLSContext {
     186             :     AVClass *class;
     187             :     AVFormatContext *ctx;
     188             :     int n_variants;
     189             :     struct variant **variants;
     190             :     int n_playlists;
     191             :     struct playlist **playlists;
     192             :     int n_renditions;
     193             :     struct rendition **renditions;
     194             : 
     195             :     int cur_seq_no;
     196             :     int live_start_index;
     197             :     int first_packet;
     198             :     int64_t first_timestamp;
     199             :     int64_t cur_timestamp;
     200             :     AVIOInterruptCB *interrupt_callback;
     201             :     char *user_agent;                    ///< holds HTTP user agent set as an AVOption to the HTTP protocol context
     202             :     char *cookies;                       ///< holds HTTP cookie values set in either the initial response or as an AVOption to the HTTP protocol context
     203             :     char *headers;                       ///< holds HTTP headers set as an AVOption to the HTTP protocol context
     204             :     char *http_proxy;                    ///< holds the address of the HTTP proxy server
     205             :     AVDictionary *avio_opts;
     206             :     int strict_std_compliance;
     207             :     char *allowed_extensions;
     208             :     int max_reload;
     209             : } HLSContext;
     210             : 
     211          56 : static int read_chomp_line(AVIOContext *s, char *buf, int maxlen)
     212             : {
     213          56 :     int len = ff_get_line(s, buf, maxlen);
     214         164 :     while (len > 0 && av_isspace(buf[len - 1]))
     215          52 :         buf[--len] = '\0';
     216          56 :     return len;
     217             : }
     218             : 
     219           4 : static void free_segment_list(struct playlist *pls)
     220             : {
     221             :     int i;
     222          18 :     for (i = 0; i < pls->n_segments; i++) {
     223          14 :         av_freep(&pls->segments[i]->key);
     224          14 :         av_freep(&pls->segments[i]->url);
     225          14 :         av_freep(&pls->segments[i]);
     226             :     }
     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 :         if (pls->ctx) {
     260           4 :             pls->ctx->pb = NULL;
     261           4 :             avformat_close_input(&pls->ctx);
     262             :         }
     263           4 :         av_free(pls);
     264             :     }
     265           4 :     av_freep(&c->playlists);
     266           4 :     av_freep(&c->cookies);
     267           4 :     av_freep(&c->user_agent);
     268           4 :     av_freep(&c->headers);
     269           4 :     av_freep(&c->http_proxy);
     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          16 : static void update_options(char **dest, const char *name, void *src)
     593             : {
     594          16 :     av_freep(dest);
     595          16 :     av_opt_get(src, name, AV_OPT_SEARCH_CHILDREN, (uint8_t**)dest);
     596          16 :     if (*dest && !strlen(*dest))
     597           0 :         av_freep(dest);
     598          16 : }
     599             : 
     600          14 : static int open_url(AVFormatContext *s, AVIOContext **pb, const char *url,
     601             :                     AVDictionary *opts, AVDictionary *opts2, int *is_http)
     602             : {
     603          14 :     HLSContext *c = s->priv_data;
     604          14 :     AVDictionary *tmp = NULL;
     605          14 :     const char *proto_name = NULL;
     606             :     int ret;
     607             : 
     608          14 :     av_dict_copy(&tmp, opts, 0);
     609          14 :     av_dict_copy(&tmp, opts2, 0);
     610             : 
     611          14 :     if (av_strstart(url, "crypto", NULL)) {
     612           0 :         if (url[6] == '+' || url[6] == ':')
     613           0 :             proto_name = avio_find_protocol_name(url + 7);
     614             :     }
     615             : 
     616          14 :     if (!proto_name)
     617          14 :         proto_name = avio_find_protocol_name(url);
     618             : 
     619          14 :     if (!proto_name)
     620           0 :         return AVERROR_INVALIDDATA;
     621             : 
     622             :     // only http(s) & file are allowed
     623          14 :     if (av_strstart(proto_name, "file", NULL)) {
     624          14 :         if (strcmp(c->allowed_extensions, "ALL") && !av_match_ext(url, c->allowed_extensions)) {
     625           0 :             av_log(s, AV_LOG_ERROR,
     626             :                 "Filename extension of \'%s\' is not a common multimedia extension, blocked for security reasons.\n"
     627             :                 "If you wish to override this adjust allowed_extensions, you can set it to \'ALL\' to allow all\n",
     628             :                 url);
     629           0 :             return AVERROR_INVALIDDATA;
     630             :         }
     631           0 :     } else if (av_strstart(proto_name, "http", NULL)) {
     632             :         ;
     633             :     } else
     634           0 :         return AVERROR_INVALIDDATA;
     635             : 
     636          14 :     if (!strncmp(proto_name, url, strlen(proto_name)) && url[strlen(proto_name)] == ':')
     637             :         ;
     638          14 :     else if (av_strstart(url, "crypto", NULL) && !strncmp(proto_name, url + 7, strlen(proto_name)) && url[7 + strlen(proto_name)] == ':')
     639             :         ;
     640          14 :     else if (strcmp(proto_name, "file") || !strncmp(url, "file,", 5))
     641           0 :         return AVERROR_INVALIDDATA;
     642             : 
     643          14 :     ret = s->io_open(s, pb, url, AVIO_FLAG_READ, &tmp);
     644          14 :     if (ret >= 0) {
     645             :         // update cookies on http response with setcookies.
     646          14 :         char *new_cookies = NULL;
     647             : 
     648          14 :         if (!(s->flags & AVFMT_FLAG_CUSTOM_IO))
     649          14 :             av_opt_get(*pb, "cookies", AV_OPT_SEARCH_CHILDREN, (uint8_t**)&new_cookies);
     650             : 
     651          14 :         if (new_cookies) {
     652           0 :             av_free(c->cookies);
     653           0 :             c->cookies = new_cookies;
     654             :         }
     655             : 
     656          14 :         av_dict_set(&opts, "cookies", c->cookies, 0);
     657             :     }
     658             : 
     659          14 :     av_dict_free(&tmp);
     660             : 
     661          14 :     if (is_http)
     662          14 :         *is_http = av_strstart(proto_name, "http", NULL);
     663             : 
     664          14 :     return ret;
     665             : }
     666             : 
     667           4 : static int parse_playlist(HLSContext *c, const char *url,
     668             :                           struct playlist *pls, AVIOContext *in)
     669             : {
     670           4 :     int ret = 0, is_segment = 0, is_variant = 0;
     671           4 :     int64_t duration = 0;
     672           4 :     enum KeyType key_type = KEY_NONE;
     673           4 :     uint8_t iv[16] = "";
     674           4 :     int has_iv = 0;
     675           4 :     char key[MAX_URL_SIZE] = "";
     676             :     char line[MAX_URL_SIZE];
     677             :     const char *ptr;
     678           4 :     int close_in = 0;
     679           4 :     int64_t seg_offset = 0;
     680           4 :     int64_t seg_size = -1;
     681           4 :     uint8_t *new_url = NULL;
     682             :     struct variant_info variant_info;
     683             :     char tmp_str[MAX_URL_SIZE];
     684           4 :     struct segment *cur_init_section = NULL;
     685             : 
     686           4 :     if (!in) {
     687             : #if 1
     688           0 :         AVDictionary *opts = NULL;
     689           0 :         close_in = 1;
     690             :         /* Some HLS servers don't like being sent the range header */
     691           0 :         av_dict_set(&opts, "seekable", "0", 0);
     692             : 
     693             :         // broker prior HTTP options that should be consistent across requests
     694           0 :         av_dict_set(&opts, "user_agent", c->user_agent, 0);
     695           0 :         av_dict_set(&opts, "cookies", c->cookies, 0);
     696           0 :         av_dict_set(&opts, "headers", c->headers, 0);
     697           0 :         av_dict_set(&opts, "http_proxy", c->http_proxy, 0);
     698             : 
     699           0 :         ret = c->ctx->io_open(c->ctx, &in, url, AVIO_FLAG_READ, &opts);
     700           0 :         av_dict_free(&opts);
     701           0 :         if (ret < 0)
     702           0 :             return ret;
     703             : #else
     704             :         ret = open_in(c, &in, url);
     705             :         if (ret < 0)
     706             :             return ret;
     707             :         close_in = 1;
     708             : #endif
     709             :     }
     710             : 
     711           4 :     if (av_opt_get(in, "location", AV_OPT_SEARCH_CHILDREN, &new_url) >= 0)
     712           0 :         url = new_url;
     713             : 
     714           4 :     read_chomp_line(in, line, sizeof(line));
     715           4 :     if (strcmp(line, "#EXTM3U")) {
     716           0 :         ret = AVERROR_INVALIDDATA;
     717           0 :         goto fail;
     718             :     }
     719             : 
     720           4 :     if (pls) {
     721           0 :         free_segment_list(pls);
     722           0 :         pls->finished = 0;
     723           0 :         pls->type = PLS_TYPE_UNSPECIFIED;
     724             :     }
     725          60 :     while (!avio_feof(in)) {
     726          52 :         read_chomp_line(in, line, sizeof(line));
     727          52 :         if (av_strstart(line, "#EXT-X-STREAM-INF:", &ptr)) {
     728           0 :             is_variant = 1;
     729           0 :             memset(&variant_info, 0, sizeof(variant_info));
     730           0 :             ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_variant_args,
     731             :                                &variant_info);
     732          52 :         } else if (av_strstart(line, "#EXT-X-KEY:", &ptr)) {
     733           0 :             struct key_info info = {{0}};
     734           0 :             ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_key_args,
     735             :                                &info);
     736           0 :             key_type = KEY_NONE;
     737           0 :             has_iv = 0;
     738           0 :             if (!strcmp(info.method, "AES-128"))
     739           0 :                 key_type = KEY_AES_128;
     740           0 :             if (!strcmp(info.method, "SAMPLE-AES"))
     741           0 :                 key_type = KEY_SAMPLE_AES;
     742           0 :             if (!strncmp(info.iv, "0x", 2) || !strncmp(info.iv, "0X", 2)) {
     743           0 :                 ff_hex_to_data(iv, info.iv + 2);
     744           0 :                 has_iv = 1;
     745             :             }
     746           0 :             av_strlcpy(key, info.uri, sizeof(key));
     747          52 :         } else if (av_strstart(line, "#EXT-X-MEDIA:", &ptr)) {
     748           0 :             struct rendition_info info = {{0}};
     749           0 :             ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_rendition_args,
     750             :                                &info);
     751           0 :             new_rendition(c, &info, url);
     752          52 :         } else if (av_strstart(line, "#EXT-X-TARGETDURATION:", &ptr)) {
     753           4 :             ret = ensure_playlist(c, &pls, url);
     754           4 :             if (ret < 0)
     755           0 :                 goto fail;
     756           4 :             pls->target_duration = strtoll(ptr, NULL, 10) * AV_TIME_BASE;
     757          48 :         } else if (av_strstart(line, "#EXT-X-MEDIA-SEQUENCE:", &ptr)) {
     758           4 :             ret = ensure_playlist(c, &pls, url);
     759           4 :             if (ret < 0)
     760           0 :                 goto fail;
     761           4 :             pls->start_seq_no = atoi(ptr);
     762          44 :         } else if (av_strstart(line, "#EXT-X-PLAYLIST-TYPE:", &ptr)) {
     763           0 :             ret = ensure_playlist(c, &pls, url);
     764           0 :             if (ret < 0)
     765           0 :                 goto fail;
     766           0 :             if (!strcmp(ptr, "EVENT"))
     767           0 :                 pls->type = PLS_TYPE_EVENT;
     768           0 :             else if (!strcmp(ptr, "VOD"))
     769           0 :                 pls->type = PLS_TYPE_VOD;
     770          44 :         } else if (av_strstart(line, "#EXT-X-MAP:", &ptr)) {
     771           0 :             struct init_section_info info = {{0}};
     772           0 :             ret = ensure_playlist(c, &pls, url);
     773           0 :             if (ret < 0)
     774           0 :                 goto fail;
     775           0 :             ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_init_section_args,
     776             :                                &info);
     777           0 :             cur_init_section = new_init_section(pls, &info, url);
     778          44 :         } else if (av_strstart(line, "#EXT-X-ENDLIST", &ptr)) {
     779           4 :             if (pls)
     780           4 :                 pls->finished = 1;
     781          40 :         } else if (av_strstart(line, "#EXTINF:", &ptr)) {
     782          14 :             is_segment = 1;
     783          14 :             duration   = atof(ptr) * AV_TIME_BASE;
     784          26 :         } else if (av_strstart(line, "#EXT-X-BYTERANGE:", &ptr)) {
     785           0 :             seg_size = strtoll(ptr, NULL, 10);
     786           0 :             ptr = strchr(ptr, '@');
     787           0 :             if (ptr)
     788           0 :                 seg_offset = strtoll(ptr+1, NULL, 10);
     789          26 :         } else if (av_strstart(line, "#", NULL)) {
     790           8 :             continue;
     791          18 :         } else if (line[0]) {
     792          14 :             if (is_variant) {
     793           0 :                 if (!new_variant(c, &variant_info, line, url)) {
     794           0 :                     ret = AVERROR(ENOMEM);
     795           0 :                     goto fail;
     796             :                 }
     797           0 :                 is_variant = 0;
     798             :             }
     799          14 :             if (is_segment) {
     800             :                 struct segment *seg;
     801          14 :                 if (!pls) {
     802           0 :                     if (!new_variant(c, 0, url, NULL)) {
     803           0 :                         ret = AVERROR(ENOMEM);
     804           0 :                         goto fail;
     805             :                     }
     806           0 :                     pls = c->playlists[c->n_playlists - 1];
     807             :                 }
     808          14 :                 seg = av_malloc(sizeof(struct segment));
     809          14 :                 if (!seg) {
     810           0 :                     ret = AVERROR(ENOMEM);
     811           0 :                     goto fail;
     812             :                 }
     813          14 :                 seg->duration = duration;
     814          14 :                 seg->key_type = key_type;
     815          14 :                 if (has_iv) {
     816           0 :                     memcpy(seg->iv, iv, sizeof(iv));
     817             :                 } else {
     818          14 :                     int seq = pls->start_seq_no + pls->n_segments;
     819          14 :                     memset(seg->iv, 0, sizeof(seg->iv));
     820          14 :                     AV_WB32(seg->iv + 12, seq);
     821             :                 }
     822             : 
     823          14 :                 if (key_type != KEY_NONE) {
     824           0 :                     ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, key);
     825           0 :                     seg->key = av_strdup(tmp_str);
     826           0 :                     if (!seg->key) {
     827           0 :                         av_free(seg);
     828           0 :                         ret = AVERROR(ENOMEM);
     829           0 :                         goto fail;
     830             :                     }
     831             :                 } else {
     832          14 :                     seg->key = NULL;
     833             :                 }
     834             : 
     835          14 :                 ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, line);
     836          14 :                 seg->url = av_strdup(tmp_str);
     837          14 :                 if (!seg->url) {
     838           0 :                     av_free(seg->key);
     839           0 :                     av_free(seg);
     840           0 :                     ret = AVERROR(ENOMEM);
     841           0 :                     goto fail;
     842             :                 }
     843             : 
     844          14 :                 dynarray_add(&pls->segments, &pls->n_segments, seg);
     845          14 :                 is_segment = 0;
     846             : 
     847          14 :                 seg->size = seg_size;
     848          14 :                 if (seg_size >= 0) {
     849           0 :                     seg->url_offset = seg_offset;
     850           0 :                     seg_offset += seg_size;
     851           0 :                     seg_size = -1;
     852             :                 } else {
     853          14 :                     seg->url_offset = 0;
     854          14 :                     seg_offset = 0;
     855             :                 }
     856             : 
     857          14 :                 seg->init_section = cur_init_section;
     858             :             }
     859             :         }
     860             :     }
     861           4 :     if (pls)
     862           4 :         pls->last_load_time = av_gettime_relative();
     863             : 
     864           4 : fail:
     865           4 :     av_free(new_url);
     866           4 :     if (close_in)
     867           0 :         ff_format_io_close(c->ctx, &in);
     868           4 :     return ret;
     869             : }
     870             : 
     871         149 : static struct segment *current_segment(struct playlist *pls)
     872             : {
     873         149 :     return pls->segments[pls->cur_seq_no - pls->start_seq_no];
     874             : }
     875             : 
     876             : enum ReadFromURLMode {
     877             :     READ_NORMAL,
     878             :     READ_COMPLETE,
     879             : };
     880             : 
     881         131 : static int read_from_url(struct playlist *pls, struct segment *seg,
     882             :                          uint8_t *buf, int buf_size,
     883             :                          enum ReadFromURLMode mode)
     884             : {
     885             :     int ret;
     886             : 
     887             :      /* limit read if the segment was only a part of a file */
     888         131 :     if (seg->size >= 0)
     889           0 :         buf_size = FFMIN(buf_size, seg->size - pls->cur_seg_offset);
     890             : 
     891         131 :     if (mode == READ_COMPLETE) {
     892           0 :         ret = avio_read(pls->input, buf, buf_size);
     893           0 :         if (ret != buf_size)
     894           0 :             av_log(NULL, AV_LOG_ERROR, "Could not read complete segment.\n");
     895             :     } else
     896         131 :         ret = avio_read(pls->input, buf, buf_size);
     897             : 
     898         131 :     if (ret > 0)
     899         117 :         pls->cur_seg_offset += ret;
     900             : 
     901         131 :     return ret;
     902             : }
     903             : 
     904             : /* Parse the raw ID3 data and pass contents to caller */
     905           0 : static void parse_id3(AVFormatContext *s, AVIOContext *pb,
     906             :                       AVDictionary **metadata, int64_t *dts,
     907             :                       ID3v2ExtraMetaAPIC **apic, ID3v2ExtraMeta **extra_meta)
     908             : {
     909             :     static const char id3_priv_owner_ts[] = "com.apple.streaming.transportStreamTimestamp";
     910             :     ID3v2ExtraMeta *meta;
     911             : 
     912           0 :     ff_id3v2_read_dict(pb, metadata, ID3v2_DEFAULT_MAGIC, extra_meta);
     913           0 :     for (meta = *extra_meta; meta; meta = meta->next) {
     914           0 :         if (!strcmp(meta->tag, "PRIV")) {
     915           0 :             ID3v2ExtraMetaPRIV *priv = meta->data;
     916           0 :             if (priv->datasize == 8 && !strcmp(priv->owner, id3_priv_owner_ts)) {
     917             :                 /* 33-bit MPEG timestamp */
     918           0 :                 int64_t ts = AV_RB64(priv->data);
     919           0 :                 av_log(s, AV_LOG_DEBUG, "HLS ID3 audio timestamp %"PRId64"\n", ts);
     920           0 :                 if ((ts & ~((1ULL << 33) - 1)) == 0)
     921           0 :                     *dts = ts;
     922             :                 else
     923           0 :                     av_log(s, AV_LOG_ERROR, "Invalid HLS ID3 audio timestamp %"PRId64"\n", ts);
     924             :             }
     925           0 :         } else if (!strcmp(meta->tag, "APIC") && apic)
     926           0 :             *apic = meta->data;
     927             :     }
     928           0 : }
     929             : 
     930             : /* Check if the ID3 metadata contents have changed */
     931           0 : static int id3_has_changed_values(struct playlist *pls, AVDictionary *metadata,
     932             :                                   ID3v2ExtraMetaAPIC *apic)
     933             : {
     934           0 :     AVDictionaryEntry *entry = NULL;
     935             :     AVDictionaryEntry *oldentry;
     936             :     /* check that no keys have changed values */
     937           0 :     while ((entry = av_dict_get(metadata, "", entry, AV_DICT_IGNORE_SUFFIX))) {
     938           0 :         oldentry = av_dict_get(pls->id3_initial, entry->key, NULL, AV_DICT_MATCH_CASE);
     939           0 :         if (!oldentry || strcmp(oldentry->value, entry->value) != 0)
     940           0 :             return 1;
     941             :     }
     942             : 
     943             :     /* check if apic appeared */
     944           0 :     if (apic && (pls->ctx->nb_streams != 2 || !pls->ctx->streams[1]->attached_pic.data))
     945           0 :         return 1;
     946             : 
     947           0 :     if (apic) {
     948           0 :         int size = pls->ctx->streams[1]->attached_pic.size;
     949           0 :         if (size != apic->buf->size - AV_INPUT_BUFFER_PADDING_SIZE)
     950           0 :             return 1;
     951             : 
     952           0 :         if (memcmp(apic->buf->data, pls->ctx->streams[1]->attached_pic.data, size) != 0)
     953           0 :             return 1;
     954             :     }
     955             : 
     956           0 :     return 0;
     957             : }
     958             : 
     959             : /* Parse ID3 data and handle the found data */
     960           0 : static void handle_id3(AVIOContext *pb, struct playlist *pls)
     961             : {
     962           0 :     AVDictionary *metadata = NULL;
     963           0 :     ID3v2ExtraMetaAPIC *apic = NULL;
     964           0 :     ID3v2ExtraMeta *extra_meta = NULL;
     965           0 :     int64_t timestamp = AV_NOPTS_VALUE;
     966             : 
     967           0 :     parse_id3(pls->ctx, pb, &metadata, &timestamp, &apic, &extra_meta);
     968             : 
     969           0 :     if (timestamp != AV_NOPTS_VALUE) {
     970           0 :         pls->id3_mpegts_timestamp = timestamp;
     971           0 :         pls->id3_offset = 0;
     972             :     }
     973             : 
     974           0 :     if (!pls->id3_found) {
     975             :         /* initial ID3 tags */
     976           0 :         av_assert0(!pls->id3_deferred_extra);
     977           0 :         pls->id3_found = 1;
     978             : 
     979             :         /* get picture attachment and set text metadata */
     980           0 :         if (pls->ctx->nb_streams)
     981           0 :             ff_id3v2_parse_apic(pls->ctx, &extra_meta);
     982             :         else
     983             :             /* demuxer not yet opened, defer picture attachment */
     984           0 :             pls->id3_deferred_extra = extra_meta;
     985             : 
     986           0 :         av_dict_copy(&pls->ctx->metadata, metadata, 0);
     987           0 :         pls->id3_initial = metadata;
     988             : 
     989             :     } else {
     990           0 :         if (!pls->id3_changed && id3_has_changed_values(pls, metadata, apic)) {
     991           0 :             avpriv_report_missing_feature(pls->ctx, "Changing ID3 metadata in HLS audio elementary stream");
     992           0 :             pls->id3_changed = 1;
     993             :         }
     994           0 :         av_dict_free(&metadata);
     995             :     }
     996             : 
     997           0 :     if (!pls->id3_deferred_extra)
     998           0 :         ff_id3v2_free_extra_meta(&extra_meta);
     999           0 : }
    1000             : 
    1001           4 : static void intercept_id3(struct playlist *pls, uint8_t *buf,
    1002             :                          int buf_size, int *len)
    1003             : {
    1004             :     /* intercept id3 tags, we do not want to pass them to the raw
    1005             :      * demuxer on all segment switches */
    1006             :     int bytes;
    1007           4 :     int id3_buf_pos = 0;
    1008           4 :     int fill_buf = 0;
    1009           4 :     struct segment *seg = current_segment(pls);
    1010             : 
    1011             :     /* gather all the id3 tags */
    1012             :     while (1) {
    1013             :         /* see if we can retrieve enough data for ID3 header */
    1014           4 :         if (*len < ID3v2_HEADER_SIZE && buf_size >= ID3v2_HEADER_SIZE) {
    1015           0 :             bytes = read_from_url(pls, seg, buf + *len, ID3v2_HEADER_SIZE - *len, READ_COMPLETE);
    1016           0 :             if (bytes > 0) {
    1017             : 
    1018           0 :                 if (bytes == ID3v2_HEADER_SIZE - *len)
    1019             :                     /* no EOF yet, so fill the caller buffer again after
    1020             :                      * we have stripped the ID3 tags */
    1021           0 :                     fill_buf = 1;
    1022             : 
    1023           0 :                 *len += bytes;
    1024             : 
    1025           0 :             } else if (*len <= 0) {
    1026             :                 /* error/EOF */
    1027           0 :                 *len = bytes;
    1028           0 :                 fill_buf = 0;
    1029             :             }
    1030             :         }
    1031             : 
    1032           4 :         if (*len < ID3v2_HEADER_SIZE)
    1033           0 :             break;
    1034             : 
    1035           4 :         if (ff_id3v2_match(buf, ID3v2_DEFAULT_MAGIC)) {
    1036           0 :             int64_t maxsize = seg->size >= 0 ? seg->size : 1024*1024;
    1037           0 :             int taglen = ff_id3v2_tag_len(buf);
    1038           0 :             int tag_got_bytes = FFMIN(taglen, *len);
    1039           0 :             int remaining = taglen - tag_got_bytes;
    1040             : 
    1041           0 :             if (taglen > maxsize) {
    1042           0 :                 av_log(pls->ctx, AV_LOG_ERROR, "Too large HLS ID3 tag (%d > %"PRId64" bytes)\n",
    1043             :                        taglen, maxsize);
    1044           0 :                 break;
    1045             :             }
    1046             : 
    1047             :             /*
    1048             :              * Copy the id3 tag to our temporary id3 buffer.
    1049             :              * We could read a small id3 tag directly without memcpy, but
    1050             :              * we would still need to copy the large tags, and handling
    1051             :              * both of those cases together with the possibility for multiple
    1052             :              * tags would make the handling a bit complex.
    1053             :              */
    1054           0 :             pls->id3_buf = av_fast_realloc(pls->id3_buf, &pls->id3_buf_size, id3_buf_pos + taglen);
    1055           0 :             if (!pls->id3_buf)
    1056           0 :                 break;
    1057           0 :             memcpy(pls->id3_buf + id3_buf_pos, buf, tag_got_bytes);
    1058           0 :             id3_buf_pos += tag_got_bytes;
    1059             : 
    1060             :             /* strip the intercepted bytes */
    1061           0 :             *len -= tag_got_bytes;
    1062           0 :             memmove(buf, buf + tag_got_bytes, *len);
    1063           0 :             av_log(pls->ctx, AV_LOG_DEBUG, "Stripped %d HLS ID3 bytes\n", tag_got_bytes);
    1064             : 
    1065           0 :             if (remaining > 0) {
    1066             :                 /* read the rest of the tag in */
    1067           0 :                 if (read_from_url(pls, seg, pls->id3_buf + id3_buf_pos, remaining, READ_COMPLETE) != remaining)
    1068           0 :                     break;
    1069           0 :                 id3_buf_pos += remaining;
    1070           0 :                 av_log(pls->ctx, AV_LOG_DEBUG, "Stripped additional %d HLS ID3 bytes\n", remaining);
    1071             :             }
    1072             : 
    1073             :         } else {
    1074             :             /* no more ID3 tags */
    1075           4 :             break;
    1076             :         }
    1077             :     }
    1078             : 
    1079             :     /* re-fill buffer for the caller unless EOF */
    1080           4 :     if (*len >= 0 && (fill_buf || *len == 0)) {
    1081           0 :         bytes = read_from_url(pls, seg, buf + *len, buf_size - *len, READ_NORMAL);
    1082             : 
    1083             :         /* ignore error if we already had some data */
    1084           0 :         if (bytes >= 0)
    1085           0 :             *len += bytes;
    1086           0 :         else if (*len == 0)
    1087           0 :             *len = bytes;
    1088             :     }
    1089             : 
    1090           4 :     if (pls->id3_buf) {
    1091             :         /* Now parse all the ID3 tags */
    1092             :         AVIOContext id3ioctx;
    1093           0 :         ffio_init_context(&id3ioctx, pls->id3_buf, id3_buf_pos, 0, NULL, NULL, NULL, NULL);
    1094           0 :         handle_id3(&id3ioctx, pls);
    1095             :     }
    1096             : 
    1097           4 :     if (pls->is_id3_timestamped == -1)
    1098           4 :         pls->is_id3_timestamped = (pls->id3_mpegts_timestamp != AV_NOPTS_VALUE);
    1099           4 : }
    1100             : 
    1101          14 : static int open_input(HLSContext *c, struct playlist *pls, struct segment *seg)
    1102             : {
    1103          14 :     AVDictionary *opts = NULL;
    1104             :     int ret;
    1105          14 :     int is_http = 0;
    1106             : 
    1107             :     // broker prior HTTP options that should be consistent across requests
    1108          14 :     av_dict_set(&opts, "user_agent", c->user_agent, 0);
    1109          14 :     av_dict_set(&opts, "cookies", c->cookies, 0);
    1110          14 :     av_dict_set(&opts, "headers", c->headers, 0);
    1111          14 :     av_dict_set(&opts, "http_proxy", c->http_proxy, 0);
    1112          14 :     av_dict_set(&opts, "seekable", "0", 0);
    1113             : 
    1114          14 :     if (seg->size >= 0) {
    1115             :         /* try to restrict the HTTP request to the part we want
    1116             :          * (if this is in fact a HTTP request) */
    1117           0 :         av_dict_set_int(&opts, "offset", seg->url_offset, 0);
    1118           0 :         av_dict_set_int(&opts, "end_offset", seg->url_offset + seg->size, 0);
    1119             :     }
    1120             : 
    1121          14 :     av_log(pls->parent, AV_LOG_VERBOSE, "HLS request for url '%s', offset %"PRId64", playlist %d\n",
    1122             :            seg->url, seg->url_offset, pls->index);
    1123             : 
    1124          14 :     if (seg->key_type == KEY_NONE) {
    1125          14 :         ret = open_url(pls->parent, &pls->input, seg->url, c->avio_opts, opts, &is_http);
    1126           0 :     } else if (seg->key_type == KEY_AES_128) {
    1127           0 :         AVDictionary *opts2 = NULL;
    1128             :         char iv[33], key[33], url[MAX_URL_SIZE];
    1129           0 :         if (strcmp(seg->key, pls->key_url)) {
    1130             :             AVIOContext *pb;
    1131           0 :             if (open_url(pls->parent, &pb, seg->key, c->avio_opts, opts, NULL) == 0) {
    1132           0 :                 ret = avio_read(pb, pls->key, sizeof(pls->key));
    1133           0 :                 if (ret != sizeof(pls->key)) {
    1134           0 :                     av_log(NULL, AV_LOG_ERROR, "Unable to read key file %s\n",
    1135             :                            seg->key);
    1136             :                 }
    1137           0 :                 ff_format_io_close(pls->parent, &pb);
    1138             :             } else {
    1139           0 :                 av_log(NULL, AV_LOG_ERROR, "Unable to open key file %s\n",
    1140             :                        seg->key);
    1141             :             }
    1142           0 :             av_strlcpy(pls->key_url, seg->key, sizeof(pls->key_url));
    1143             :         }
    1144           0 :         ff_data_to_hex(iv, seg->iv, sizeof(seg->iv), 0);
    1145           0 :         ff_data_to_hex(key, pls->key, sizeof(pls->key), 0);
    1146           0 :         iv[32] = key[32] = '\0';
    1147           0 :         if (strstr(seg->url, "://"))
    1148           0 :             snprintf(url, sizeof(url), "crypto+%s", seg->url);
    1149             :         else
    1150           0 :             snprintf(url, sizeof(url), "crypto:%s", seg->url);
    1151             : 
    1152           0 :         av_dict_copy(&opts2, c->avio_opts, 0);
    1153           0 :         av_dict_set(&opts2, "key", key, 0);
    1154           0 :         av_dict_set(&opts2, "iv", iv, 0);
    1155             : 
    1156           0 :         ret = open_url(pls->parent, &pls->input, url, opts2, opts, &is_http);
    1157             : 
    1158           0 :         av_dict_free(&opts2);
    1159             : 
    1160           0 :         if (ret < 0) {
    1161           0 :             goto cleanup;
    1162             :         }
    1163           0 :         ret = 0;
    1164           0 :     } else if (seg->key_type == KEY_SAMPLE_AES) {
    1165           0 :         av_log(pls->parent, AV_LOG_ERROR,
    1166             :                "SAMPLE-AES encryption is not supported yet\n");
    1167           0 :         ret = AVERROR_PATCHWELCOME;
    1168             :     }
    1169             :     else
    1170           0 :       ret = AVERROR(ENOSYS);
    1171             : 
    1172             :     /* Seek to the requested position. If this was a HTTP request, the offset
    1173             :      * should already be where want it to, but this allows e.g. local testing
    1174             :      * without a HTTP server.
    1175             :      *
    1176             :      * This is not done for HTTP at all as avio_seek() does internal bookkeeping
    1177             :      * of file offset which is out-of-sync with the actual offset when "offset"
    1178             :      * AVOption is used with http protocol, causing the seek to not be a no-op
    1179             :      * as would be expected. Wrong offset received from the server will not be
    1180             :      * noticed without the call, though.
    1181             :      */
    1182          56 :     if (ret == 0 && !is_http && seg->key_type == KEY_NONE && seg->url_offset) {
    1183           0 :         int64_t seekret = avio_seek(pls->input, seg->url_offset, SEEK_SET);
    1184           0 :         if (seekret < 0) {
    1185           0 :             av_log(pls->parent, AV_LOG_ERROR, "Unable to seek to offset %"PRId64" of HLS segment '%s'\n", seg->url_offset, seg->url);
    1186           0 :             ret = seekret;
    1187           0 :             ff_format_io_close(pls->parent, &pls->input);
    1188             :         }
    1189             :     }
    1190             : 
    1191          28 : cleanup:
    1192          14 :     av_dict_free(&opts);
    1193          14 :     pls->cur_seg_offset = 0;
    1194          14 :     return ret;
    1195             : }
    1196             : 
    1197          14 : static int update_init_section(struct playlist *pls, struct segment *seg)
    1198             : {
    1199             :     static const int max_init_section_size = 1024*1024;
    1200          14 :     HLSContext *c = pls->parent->priv_data;
    1201             :     int64_t sec_size;
    1202             :     int64_t urlsize;
    1203             :     int ret;
    1204             : 
    1205          14 :     if (seg->init_section == pls->cur_init_section)
    1206          14 :         return 0;
    1207             : 
    1208           0 :     pls->cur_init_section = NULL;
    1209             : 
    1210           0 :     if (!seg->init_section)
    1211           0 :         return 0;
    1212             : 
    1213           0 :     ret = open_input(c, pls, seg->init_section);
    1214           0 :     if (ret < 0) {
    1215           0 :         av_log(pls->parent, AV_LOG_WARNING,
    1216             :                "Failed to open an initialization section in playlist %d\n",
    1217             :                pls->index);
    1218           0 :         return ret;
    1219             :     }
    1220             : 
    1221           0 :     if (seg->init_section->size >= 0)
    1222           0 :         sec_size = seg->init_section->size;
    1223           0 :     else if ((urlsize = avio_size(pls->input)) >= 0)
    1224           0 :         sec_size = urlsize;
    1225             :     else
    1226           0 :         sec_size = max_init_section_size;
    1227             : 
    1228           0 :     av_log(pls->parent, AV_LOG_DEBUG,
    1229             :            "Downloading an initialization section of size %"PRId64"\n",
    1230             :            sec_size);
    1231             : 
    1232           0 :     sec_size = FFMIN(sec_size, max_init_section_size);
    1233             : 
    1234           0 :     av_fast_malloc(&pls->init_sec_buf, &pls->init_sec_buf_size, sec_size);
    1235             : 
    1236           0 :     ret = read_from_url(pls, seg->init_section, pls->init_sec_buf,
    1237           0 :                         pls->init_sec_buf_size, READ_COMPLETE);
    1238           0 :     ff_format_io_close(pls->parent, &pls->input);
    1239             : 
    1240           0 :     if (ret < 0)
    1241           0 :         return ret;
    1242             : 
    1243           0 :     pls->cur_init_section = seg->init_section;
    1244           0 :     pls->init_sec_data_len = ret;
    1245           0 :     pls->init_sec_buf_read_offset = 0;
    1246             : 
    1247             :     /* spec says audio elementary streams do not have media initialization
    1248             :      * sections, so there should be no ID3 timestamps */
    1249           0 :     pls->is_id3_timestamped = 0;
    1250             : 
    1251           0 :     return 0;
    1252             : }
    1253             : 
    1254          28 : static int64_t default_reload_interval(struct playlist *pls)
    1255             : {
    1256          28 :     return pls->n_segments > 0 ?
    1257          28 :                           pls->segments[pls->n_segments - 1]->duration :
    1258             :                           pls->target_duration;
    1259             : }
    1260             : 
    1261        2490 : static int playlist_needed(struct playlist *pls)
    1262             : {
    1263        2490 :     AVFormatContext *s = pls->parent;
    1264             :     int i, j;
    1265        2490 :     int stream_needed = 0;
    1266             :     int first_st;
    1267             : 
    1268             :     /* If there is no context or streams yet, the playlist is needed */
    1269        2490 :     if (!pls->ctx || !pls->n_main_streams)
    1270           4 :         return 1;
    1271             : 
    1272             :     /* check if any of the streams in the playlist are needed */
    1273        2486 :     for (i = 0; i < pls->n_main_streams; i++) {
    1274        2486 :         if (pls->main_streams[i]->discard < AVDISCARD_ALL) {
    1275        2486 :             stream_needed = 1;
    1276        2486 :             break;
    1277             :         }
    1278             :     }
    1279             : 
    1280             :     /* If all streams in the playlist were discarded, the playlist is not
    1281             :      * needed (regardless of whether whole programs are discarded or not). */
    1282        2486 :     if (!stream_needed)
    1283           0 :         return 0;
    1284             : 
    1285             :     /* Otherwise, check if all the programs (variants) this playlist is in are
    1286             :      * discarded. Since all streams in the playlist are part of the same programs
    1287             :      * we can just check the programs of the first stream. */
    1288             : 
    1289        2486 :     first_st = pls->main_streams[0]->index;
    1290             : 
    1291        2486 :     for (i = 0; i < s->nb_programs; i++) {
    1292        2486 :         AVProgram *program = s->programs[i];
    1293        2486 :         if (program->discard < AVDISCARD_ALL) {
    1294        2486 :             for (j = 0; j < program->nb_stream_indexes; j++) {
    1295        2486 :                 if (program->stream_index[j] == first_st) {
    1296             :                     /* playlist is in an undiscarded program */
    1297        2486 :                     return 1;
    1298             :                 }
    1299             :             }
    1300             :         }
    1301             :     }
    1302             : 
    1303             :     /* some streams were not discarded but all the programs were */
    1304           0 :     return 0;
    1305             : }
    1306             : 
    1307         131 : static int read_data(void *opaque, uint8_t *buf, int buf_size)
    1308             : {
    1309         131 :     struct playlist *v = opaque;
    1310         131 :     HLSContext *c = v->parent->priv_data;
    1311             :     int ret;
    1312         131 :     int just_opened = 0;
    1313         131 :     int reload_count = 0;
    1314             : 
    1315         145 : restart:
    1316         145 :     if (!v->needed)
    1317           0 :         return AVERROR_EOF;
    1318             : 
    1319         145 :     if (!v->input) {
    1320             :         int64_t reload_interval;
    1321             :         struct segment *seg;
    1322             : 
    1323             :         /* Check that the playlist is still needed before opening a new
    1324             :          * segment. */
    1325          28 :         v->needed = playlist_needed(v);
    1326             : 
    1327          28 :         if (!v->needed) {
    1328           0 :             av_log(v->parent, AV_LOG_INFO, "No longer receiving playlist %d\n",
    1329             :                 v->index);
    1330           0 :             return AVERROR_EOF;
    1331             :         }
    1332             : 
    1333             :         /* If this is a live stream and the reload interval has elapsed since
    1334             :          * the last playlist reload, reload the playlists now. */
    1335          28 :         reload_interval = default_reload_interval(v);
    1336             : 
    1337          28 : reload:
    1338          28 :         reload_count++;
    1339          28 :         if (reload_count > c->max_reload)
    1340           0 :             return AVERROR_EOF;
    1341          28 :         if (!v->finished &&
    1342           0 :             av_gettime_relative() - v->last_load_time >= reload_interval) {
    1343           0 :             if ((ret = parse_playlist(c, v->url, v, NULL)) < 0) {
    1344           0 :                 av_log(v->parent, AV_LOG_WARNING, "Failed to reload playlist %d\n",
    1345             :                        v->index);
    1346           0 :                 return ret;
    1347             :             }
    1348             :             /* If we need to reload the playlist again below (if
    1349             :              * there's still no more segments), switch to a reload
    1350             :              * interval of half the target duration. */
    1351           0 :             reload_interval = v->target_duration / 2;
    1352             :         }
    1353          28 :         if (v->cur_seq_no < v->start_seq_no) {
    1354           0 :             av_log(NULL, AV_LOG_WARNING,
    1355             :                    "skipping %d segments ahead, expired from playlists\n",
    1356           0 :                    v->start_seq_no - v->cur_seq_no);
    1357           0 :             v->cur_seq_no = v->start_seq_no;
    1358             :         }
    1359          28 :         if (v->cur_seq_no >= v->start_seq_no + v->n_segments) {
    1360          14 :             if (v->finished)
    1361          14 :                 return AVERROR_EOF;
    1362           0 :             while (av_gettime_relative() - v->last_load_time < reload_interval) {
    1363           0 :                 if (ff_check_interrupt(c->interrupt_callback))
    1364           0 :                     return AVERROR_EXIT;
    1365           0 :                 av_usleep(100*1000);
    1366             :             }
    1367             :             /* Enough time has elapsed since the last reload */
    1368           0 :             goto reload;
    1369             :         }
    1370             : 
    1371          14 :         seg = current_segment(v);
    1372             : 
    1373             :         /* load/update Media Initialization Section, if any */
    1374          14 :         ret = update_init_section(v, seg);
    1375          14 :         if (ret)
    1376           0 :             return ret;
    1377             : 
    1378          14 :         ret = open_input(c, v, seg);
    1379          14 :         if (ret < 0) {
    1380           0 :             if (ff_check_interrupt(c->interrupt_callback))
    1381           0 :                 return AVERROR_EXIT;
    1382           0 :             av_log(v->parent, AV_LOG_WARNING, "Failed to open segment of playlist %d\n",
    1383             :                    v->index);
    1384           0 :             v->cur_seq_no += 1;
    1385           0 :             goto reload;
    1386             :         }
    1387          14 :         just_opened = 1;
    1388             :     }
    1389             : 
    1390         131 :     if (v->init_sec_buf_read_offset < v->init_sec_data_len) {
    1391             :         /* Push init section out first before first actual segment */
    1392           0 :         int copy_size = FFMIN(v->init_sec_data_len - v->init_sec_buf_read_offset, buf_size);
    1393           0 :         memcpy(buf, v->init_sec_buf, copy_size);
    1394           0 :         v->init_sec_buf_read_offset += copy_size;
    1395           0 :         return copy_size;
    1396             :     }
    1397             : 
    1398         131 :     ret = read_from_url(v, current_segment(v), buf, buf_size, READ_NORMAL);
    1399         131 :     if (ret > 0) {
    1400         117 :         if (just_opened && v->is_id3_timestamped != 0) {
    1401             :             /* Intercept ID3 tags here, elementary audio streams are required
    1402             :              * to convey timestamps using them in the beginning of each segment. */
    1403           4 :             intercept_id3(v, buf, buf_size, &ret);
    1404             :         }
    1405             : 
    1406         117 :         return ret;
    1407             :     }
    1408          14 :     ff_format_io_close(v->parent, &v->input);
    1409          14 :     v->cur_seq_no++;
    1410             : 
    1411          14 :     c->cur_seq_no = v->cur_seq_no;
    1412             : 
    1413          14 :     goto restart;
    1414             : }
    1415             : 
    1416           0 : static void add_renditions_to_variant(HLSContext *c, struct variant *var,
    1417             :                                       enum AVMediaType type, const char *group_id)
    1418             : {
    1419             :     int i;
    1420             : 
    1421           0 :     for (i = 0; i < c->n_renditions; i++) {
    1422           0 :         struct rendition *rend = c->renditions[i];
    1423             : 
    1424           0 :         if (rend->type == type && !strcmp(rend->group_id, group_id)) {
    1425             : 
    1426           0 :             if (rend->playlist)
    1427             :                 /* rendition is an external playlist
    1428             :                  * => add the playlist to the variant */
    1429           0 :                 dynarray_add(&var->playlists, &var->n_playlists, rend->playlist);
    1430             :             else
    1431             :                 /* rendition is part of the variant main Media Playlist
    1432             :                  * => add the rendition to the main Media Playlist */
    1433           0 :                 dynarray_add(&var->playlists[0]->renditions,
    1434             :                              &var->playlists[0]->n_renditions,
    1435             :                              rend);
    1436             :         }
    1437             :     }
    1438           0 : }
    1439             : 
    1440          12 : static void add_metadata_from_renditions(AVFormatContext *s, struct playlist *pls,
    1441             :                                          enum AVMediaType type)
    1442             : {
    1443          12 :     int rend_idx = 0;
    1444             :     int i;
    1445             : 
    1446          20 :     for (i = 0; i < pls->n_main_streams; i++) {
    1447          12 :         AVStream *st = pls->main_streams[i];
    1448             : 
    1449          12 :         if (st->codecpar->codec_type != type)
    1450           8 :             continue;
    1451             : 
    1452           4 :         for (; rend_idx < pls->n_renditions; rend_idx++) {
    1453           0 :             struct rendition *rend = pls->renditions[rend_idx];
    1454             : 
    1455           0 :             if (rend->type != type)
    1456           0 :                 continue;
    1457             : 
    1458           0 :             if (rend->language[0])
    1459           0 :                 av_dict_set(&st->metadata, "language", rend->language, 0);
    1460           0 :             if (rend->name[0])
    1461           0 :                 av_dict_set(&st->metadata, "comment", rend->name, 0);
    1462             : 
    1463           0 :             st->disposition |= rend->disposition;
    1464             :         }
    1465           4 :         if (rend_idx >=pls->n_renditions)
    1466           4 :             break;
    1467             :     }
    1468          12 : }
    1469             : 
    1470             : /* if timestamp was in valid range: returns 1 and sets seq_no
    1471             :  * if not: returns 0 and sets seq_no to closest segment */
    1472           0 : static int find_timestamp_in_playlist(HLSContext *c, struct playlist *pls,
    1473             :                                       int64_t timestamp, int *seq_no)
    1474             : {
    1475             :     int i;
    1476           0 :     int64_t pos = c->first_timestamp == AV_NOPTS_VALUE ?
    1477           0 :                   0 : c->first_timestamp;
    1478             : 
    1479           0 :     if (timestamp < pos) {
    1480           0 :         *seq_no = pls->start_seq_no;
    1481           0 :         return 0;
    1482             :     }
    1483             : 
    1484           0 :     for (i = 0; i < pls->n_segments; i++) {
    1485           0 :         int64_t diff = pos + pls->segments[i]->duration - timestamp;
    1486           0 :         if (diff > 0) {
    1487           0 :             *seq_no = pls->start_seq_no + i;
    1488           0 :             return 1;
    1489             :         }
    1490           0 :         pos += pls->segments[i]->duration;
    1491             :     }
    1492             : 
    1493           0 :     *seq_no = pls->start_seq_no + pls->n_segments - 1;
    1494             : 
    1495           0 :     return 0;
    1496             : }
    1497             : 
    1498           4 : static int select_cur_seq_no(HLSContext *c, struct playlist *pls)
    1499             : {
    1500             :     int seq_no;
    1501             : 
    1502           4 :     if (!pls->finished && !c->first_packet &&
    1503           0 :         av_gettime_relative() - pls->last_load_time >= default_reload_interval(pls))
    1504             :         /* reload the playlist since it was suspended */
    1505           0 :         parse_playlist(c, pls->url, pls, NULL);
    1506             : 
    1507             :     /* If playback is already in progress (we are just selecting a new
    1508             :      * playlist) and this is a complete file, find the matching segment
    1509             :      * by counting durations. */
    1510           4 :     if (pls->finished && c->cur_timestamp != AV_NOPTS_VALUE) {
    1511           0 :         find_timestamp_in_playlist(c, pls, c->cur_timestamp, &seq_no);
    1512           0 :         return seq_no;
    1513             :     }
    1514             : 
    1515           4 :     if (!pls->finished) {
    1516           0 :         if (!c->first_packet && /* we are doing a segment selection during playback */
    1517           0 :             c->cur_seq_no >= pls->start_seq_no &&
    1518           0 :             c->cur_seq_no < pls->start_seq_no + pls->n_segments)
    1519             :             /* While spec 3.4.3 says that we cannot assume anything about the
    1520             :              * content at the same sequence number on different playlists,
    1521             :              * in practice this seems to work and doing it otherwise would
    1522             :              * require us to download a segment to inspect its timestamps. */
    1523           0 :             return c->cur_seq_no;
    1524             : 
    1525             :         /* If this is a live stream, start live_start_index segments from the
    1526             :          * start or end */
    1527           0 :         if (c->live_start_index < 0)
    1528           0 :             return pls->start_seq_no + FFMAX(pls->n_segments + c->live_start_index, 0);
    1529             :         else
    1530           0 :             return pls->start_seq_no + FFMIN(c->live_start_index, pls->n_segments - 1);
    1531             :     }
    1532             : 
    1533             :     /* Otherwise just start on the first segment. */
    1534           4 :     return pls->start_seq_no;
    1535             : }
    1536             : 
    1537           4 : static int save_avio_options(AVFormatContext *s)
    1538             : {
    1539           4 :     HLSContext *c = s->priv_data;
    1540             :     static const char * const opts[] = {
    1541             :         "headers", "http_proxy", "user_agent", "user-agent", "cookies", NULL };
    1542           4 :     const char * const * opt = opts;
    1543             :     uint8_t *buf;
    1544           4 :     int ret = 0;
    1545             : 
    1546          28 :     while (*opt) {
    1547          20 :         if (av_opt_get(s->pb, *opt, AV_OPT_SEARCH_CHILDREN | AV_OPT_ALLOW_NULL, &buf) >= 0) {
    1548           0 :             ret = av_dict_set(&c->avio_opts, *opt, buf,
    1549             :                               AV_DICT_DONT_STRDUP_VAL);
    1550           0 :             if (ret < 0)
    1551           0 :                 return ret;
    1552             :         }
    1553          20 :         opt++;
    1554             :     }
    1555             : 
    1556           4 :     return ret;
    1557             : }
    1558             : 
    1559           0 : static int nested_io_open(AVFormatContext *s, AVIOContext **pb, const char *url,
    1560             :                           int flags, AVDictionary **opts)
    1561             : {
    1562           0 :     av_log(s, AV_LOG_ERROR,
    1563             :            "A HLS playlist item '%s' referred to an external file '%s'. "
    1564             :            "Opening this file was forbidden for security reasons\n",
    1565           0 :            s->filename, url);
    1566           0 :     return AVERROR(EPERM);
    1567             : }
    1568             : 
    1569           4 : static void add_stream_to_programs(AVFormatContext *s, struct playlist *pls, AVStream *stream)
    1570             : {
    1571           4 :     HLSContext *c = s->priv_data;
    1572             :     int i, j;
    1573           4 :     int bandwidth = -1;
    1574             : 
    1575           8 :     for (i = 0; i < c->n_variants; i++) {
    1576           4 :         struct variant *v = c->variants[i];
    1577             : 
    1578           8 :         for (j = 0; j < v->n_playlists; j++) {
    1579           4 :             if (v->playlists[j] != pls)
    1580           0 :                 continue;
    1581             : 
    1582           4 :             av_program_add_stream_index(s, i, stream->index);
    1583             : 
    1584           4 :             if (bandwidth < 0)
    1585           4 :                 bandwidth = v->bandwidth;
    1586           0 :             else if (bandwidth != v->bandwidth)
    1587           0 :                 bandwidth = -1; /* stream in multiple variants with different bandwidths */
    1588             :         }
    1589             :     }
    1590             : 
    1591           4 :     if (bandwidth >= 0)
    1592           4 :         av_dict_set_int(&stream->metadata, "variant_bitrate", bandwidth, 0);
    1593           4 : }
    1594             : 
    1595           6 : static int set_stream_info_from_input_stream(AVStream *st, struct playlist *pls, AVStream *ist)
    1596             : {
    1597             :     int err;
    1598             : 
    1599           6 :     err = avcodec_parameters_copy(st->codecpar, ist->codecpar);
    1600           6 :     if (err < 0)
    1601           0 :         return err;
    1602             : 
    1603           6 :     if (pls->is_id3_timestamped) /* custom timestamps via id3 */
    1604           0 :         avpriv_set_pts_info(st, 33, 1, MPEG_TIME_BASE);
    1605             :     else
    1606           6 :         avpriv_set_pts_info(st, ist->pts_wrap_bits, ist->time_base.num, ist->time_base.den);
    1607             : 
    1608           6 :     st->internal->need_context_update = 1;
    1609             : 
    1610           6 :     return 0;
    1611             : }
    1612             : 
    1613             : /* add new subdemuxer streams to our context, if any */
    1614        2462 : static int update_streams_from_subdemuxer(AVFormatContext *s, struct playlist *pls)
    1615             : {
    1616             :     int err;
    1617             : 
    1618        4928 :     while (pls->n_main_streams < pls->ctx->nb_streams) {
    1619           4 :         int ist_idx = pls->n_main_streams;
    1620           4 :         AVStream *st = avformat_new_stream(s, NULL);
    1621           4 :         AVStream *ist = pls->ctx->streams[ist_idx];
    1622             : 
    1623           4 :         if (!st)
    1624           0 :             return AVERROR(ENOMEM);
    1625             : 
    1626           4 :         st->id = pls->index;
    1627           4 :         dynarray_add(&pls->main_streams, &pls->n_main_streams, st);
    1628             : 
    1629           4 :         add_stream_to_programs(s, pls, st);
    1630             : 
    1631           4 :         err = set_stream_info_from_input_stream(st, pls, ist);
    1632           4 :         if (err < 0)
    1633           0 :             return err;
    1634             :     }
    1635             : 
    1636        2462 :     return 0;
    1637             : }
    1638             : 
    1639           7 : static void update_noheader_flag(AVFormatContext *s)
    1640             : {
    1641           7 :     HLSContext *c = s->priv_data;
    1642           7 :     int flag_needed = 0;
    1643             :     int i;
    1644             : 
    1645          11 :     for (i = 0; i < c->n_playlists; i++) {
    1646           7 :         struct playlist *pls = c->playlists[i];
    1647             : 
    1648           7 :         if (pls->has_noheader_flag) {
    1649           3 :             flag_needed = 1;
    1650           3 :             break;
    1651             :         }
    1652             :     }
    1653             : 
    1654           7 :     if (flag_needed)
    1655           3 :         s->ctx_flags |= AVFMTCTX_NOHEADER;
    1656             :     else
    1657           4 :         s->ctx_flags &= ~AVFMTCTX_NOHEADER;
    1658           7 : }
    1659             : 
    1660           4 : static int hls_close(AVFormatContext *s)
    1661             : {
    1662           4 :     HLSContext *c = s->priv_data;
    1663             : 
    1664           4 :     free_playlist_list(c);
    1665           4 :     free_variant_list(c);
    1666           4 :     free_rendition_list(c);
    1667             : 
    1668           4 :     av_dict_free(&c->avio_opts);
    1669             : 
    1670           4 :     return 0;
    1671             : }
    1672             : 
    1673           4 : static int hls_read_header(AVFormatContext *s)
    1674             : {
    1675           4 :     void *u = (s->flags & AVFMT_FLAG_CUSTOM_IO) ? NULL : s->pb;
    1676           4 :     HLSContext *c = s->priv_data;
    1677           4 :     int ret = 0, i;
    1678           4 :     int highest_cur_seq_no = 0;
    1679             : 
    1680           4 :     c->ctx                = s;
    1681           4 :     c->interrupt_callback = &s->interrupt_callback;
    1682           4 :     c->strict_std_compliance = s->strict_std_compliance;
    1683             : 
    1684           4 :     c->first_packet = 1;
    1685           4 :     c->first_timestamp = AV_NOPTS_VALUE;
    1686           4 :     c->cur_timestamp = AV_NOPTS_VALUE;
    1687             : 
    1688           4 :     if (u) {
    1689             :         // get the previous user agent & set back to null if string size is zero
    1690           4 :         update_options(&c->user_agent, "user_agent", u);
    1691             : 
    1692             :         // get the previous cookies & set back to null if string size is zero
    1693           4 :         update_options(&c->cookies, "cookies", u);
    1694             : 
    1695             :         // get the previous headers & set back to null if string size is zero
    1696           4 :         update_options(&c->headers, "headers", u);
    1697             : 
    1698             :         // get the previous http proxt & set back to null if string size is zero
    1699           4 :         update_options(&c->http_proxy, "http_proxy", u);
    1700             :     }
    1701             : 
    1702           4 :     if ((ret = parse_playlist(c, s->filename, NULL, s->pb)) < 0)
    1703           0 :         goto fail;
    1704             : 
    1705           4 :     if ((ret = save_avio_options(s)) < 0)
    1706           0 :         goto fail;
    1707             : 
    1708             :     /* Some HLS servers don't like being sent the range header */
    1709           4 :     av_dict_set(&c->avio_opts, "seekable", "0", 0);
    1710             : 
    1711           4 :     if (c->n_variants == 0) {
    1712           0 :         av_log(NULL, AV_LOG_WARNING, "Empty playlist\n");
    1713           0 :         ret = AVERROR_EOF;
    1714           0 :         goto fail;
    1715             :     }
    1716             :     /* If the playlist only contained playlists (Master Playlist),
    1717             :      * parse each individual playlist. */
    1718           4 :     if (c->n_playlists > 1 || c->playlists[0]->n_segments == 0) {
    1719           0 :         for (i = 0; i < c->n_playlists; i++) {
    1720           0 :             struct playlist *pls = c->playlists[i];
    1721           0 :             if ((ret = parse_playlist(c, pls->url, pls, NULL)) < 0)
    1722           0 :                 goto fail;
    1723             :         }
    1724             :     }
    1725             : 
    1726           4 :     if (c->variants[0]->playlists[0]->n_segments == 0) {
    1727           0 :         av_log(NULL, AV_LOG_WARNING, "Empty playlist\n");
    1728           0 :         ret = AVERROR_EOF;
    1729           0 :         goto fail;
    1730             :     }
    1731             : 
    1732             :     /* If this isn't a live stream, calculate the total duration of the
    1733             :      * stream. */
    1734           4 :     if (c->variants[0]->playlists[0]->finished) {
    1735           4 :         int64_t duration = 0;
    1736          18 :         for (i = 0; i < c->variants[0]->playlists[0]->n_segments; i++)
    1737          14 :             duration += c->variants[0]->playlists[0]->segments[i]->duration;
    1738           4 :         s->duration = duration;
    1739             :     }
    1740             : 
    1741             :     /* Associate renditions with variants */
    1742           8 :     for (i = 0; i < c->n_variants; i++) {
    1743           4 :         struct variant *var = c->variants[i];
    1744             : 
    1745           4 :         if (var->audio_group[0])
    1746           0 :             add_renditions_to_variant(c, var, AVMEDIA_TYPE_AUDIO, var->audio_group);
    1747           4 :         if (var->video_group[0])
    1748           0 :             add_renditions_to_variant(c, var, AVMEDIA_TYPE_VIDEO, var->video_group);
    1749           4 :         if (var->subtitles_group[0])
    1750           0 :             add_renditions_to_variant(c, var, AVMEDIA_TYPE_SUBTITLE, var->subtitles_group);
    1751             :     }
    1752             : 
    1753             :     /* Create a program for each variant */
    1754           8 :     for (i = 0; i < c->n_variants; i++) {
    1755           4 :         struct variant *v = c->variants[i];
    1756             :         AVProgram *program;
    1757             : 
    1758           4 :         program = av_new_program(s, i);
    1759           4 :         if (!program)
    1760           0 :             goto fail;
    1761           4 :         av_dict_set_int(&program->metadata, "variant_bitrate", v->bandwidth, 0);
    1762             :     }
    1763             : 
    1764             :     /* Select the starting segments */
    1765           8 :     for (i = 0; i < c->n_playlists; i++) {
    1766           4 :         struct playlist *pls = c->playlists[i];
    1767             : 
    1768           4 :         if (pls->n_segments == 0)
    1769           0 :             continue;
    1770             : 
    1771           4 :         pls->cur_seq_no = select_cur_seq_no(c, pls);
    1772           4 :         highest_cur_seq_no = FFMAX(highest_cur_seq_no, pls->cur_seq_no);
    1773             :     }
    1774             : 
    1775             :     /* Open the demuxer for each playlist */
    1776           8 :     for (i = 0; i < c->n_playlists; i++) {
    1777           4 :         struct playlist *pls = c->playlists[i];
    1778           4 :         AVInputFormat *in_fmt = NULL;
    1779             : 
    1780           4 :         if (!(pls->ctx = avformat_alloc_context())) {
    1781           0 :             ret = AVERROR(ENOMEM);
    1782           0 :             goto fail;
    1783             :         }
    1784             : 
    1785           4 :         if (pls->n_segments == 0)
    1786           0 :             continue;
    1787             : 
    1788           4 :         pls->index  = i;
    1789           4 :         pls->needed = 1;
    1790           4 :         pls->parent = s;
    1791             : 
    1792             :         /*
    1793             :          * If this is a live stream and this playlist looks like it is one segment
    1794             :          * behind, try to sync it up so that every substream starts at the same
    1795             :          * time position (so e.g. avformat_find_stream_info() will see packets from
    1796             :          * all active streams within the first few seconds). This is not very generic,
    1797             :          * though, as the sequence numbers are technically independent.
    1798             :          */
    1799           4 :         if (!pls->finished && pls->cur_seq_no == highest_cur_seq_no - 1 &&
    1800           0 :             highest_cur_seq_no < pls->start_seq_no + pls->n_segments) {
    1801           0 :             pls->cur_seq_no = highest_cur_seq_no;
    1802             :         }
    1803             : 
    1804           4 :         pls->read_buffer = av_malloc(INITIAL_BUFFER_SIZE);
    1805           4 :         if (!pls->read_buffer){
    1806           0 :             ret = AVERROR(ENOMEM);
    1807           0 :             avformat_free_context(pls->ctx);
    1808           0 :             pls->ctx = NULL;
    1809           0 :             goto fail;
    1810             :         }
    1811           4 :         ffio_init_context(&pls->pb, pls->read_buffer, INITIAL_BUFFER_SIZE, 0, pls,
    1812             :                           read_data, NULL, NULL);
    1813           4 :         pls->pb.seekable = 0;
    1814           4 :         ret = av_probe_input_buffer(&pls->pb, &in_fmt, pls->segments[0]->url,
    1815             :                                     NULL, 0, 0);
    1816           4 :         if (ret < 0) {
    1817             :             /* Free the ctx - it isn't initialized properly at this point,
    1818             :              * so avformat_close_input shouldn't be called. If
    1819             :              * avformat_open_input fails below, it frees and zeros the
    1820             :              * context, so it doesn't need any special treatment like this. */
    1821           0 :             av_log(s, AV_LOG_ERROR, "Error when loading first segment '%s'\n", pls->segments[0]->url);
    1822           0 :             avformat_free_context(pls->ctx);
    1823           0 :             pls->ctx = NULL;
    1824           0 :             goto fail;
    1825             :         }
    1826           4 :         pls->ctx->pb       = &pls->pb;
    1827           4 :         pls->ctx->io_open  = nested_io_open;
    1828           4 :         pls->ctx->flags   |= s->flags & ~AVFMT_FLAG_CUSTOM_IO;
    1829             : 
    1830           4 :         if ((ret = ff_copy_whiteblacklists(pls->ctx, s)) < 0)
    1831           0 :             goto fail;
    1832             : 
    1833           4 :         ret = avformat_open_input(&pls->ctx, pls->segments[0]->url, in_fmt, NULL);
    1834           4 :         if (ret < 0)
    1835           0 :             goto fail;
    1836             : 
    1837           4 :         if (pls->id3_deferred_extra && pls->ctx->nb_streams == 1) {
    1838           0 :             ff_id3v2_parse_apic(pls->ctx, &pls->id3_deferred_extra);
    1839           0 :             avformat_queue_attached_pictures(pls->ctx);
    1840           0 :             ff_id3v2_free_extra_meta(&pls->id3_deferred_extra);
    1841           0 :             pls->id3_deferred_extra = NULL;
    1842             :         }
    1843             : 
    1844           4 :         if (pls->is_id3_timestamped == -1)
    1845           0 :             av_log(s, AV_LOG_WARNING, "No expected HTTP requests have been made\n");
    1846             : 
    1847             :         /*
    1848             :          * For ID3 timestamped raw audio streams we need to detect the packet
    1849             :          * durations to calculate timestamps in fill_timing_for_id3_timestamped_stream(),
    1850             :          * but for other streams we can rely on our user calling avformat_find_stream_info()
    1851             :          * on us if they want to.
    1852             :          */
    1853           4 :         if (pls->is_id3_timestamped) {
    1854           0 :             ret = avformat_find_stream_info(pls->ctx, NULL);
    1855           0 :             if (ret < 0)
    1856           0 :                 goto fail;
    1857             :         }
    1858             : 
    1859           4 :         pls->has_noheader_flag = !!(pls->ctx->ctx_flags & AVFMTCTX_NOHEADER);
    1860             : 
    1861             :         /* Create new AVStreams for each stream in this playlist */
    1862           4 :         ret = update_streams_from_subdemuxer(s, pls);
    1863           4 :         if (ret < 0)
    1864           0 :             goto fail;
    1865             : 
    1866           4 :         add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_AUDIO);
    1867           4 :         add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_VIDEO);
    1868           4 :         add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_SUBTITLE);
    1869             :     }
    1870             : 
    1871           4 :     update_noheader_flag(s);
    1872             : 
    1873           4 :     return 0;
    1874           0 : fail:
    1875           0 :     hls_close(s);
    1876           0 :     return ret;
    1877             : }
    1878             : 
    1879        2462 : static int recheck_discard_flags(AVFormatContext *s, int first)
    1880             : {
    1881        2462 :     HLSContext *c = s->priv_data;
    1882        2462 :     int i, changed = 0;
    1883             :     int cur_needed;
    1884             : 
    1885             :     /* Check if any new streams are needed */
    1886        4924 :     for (i = 0; i < c->n_playlists; i++) {
    1887        2462 :         struct playlist *pls = c->playlists[i];
    1888             : 
    1889        2462 :         cur_needed = playlist_needed(c->playlists[i]);
    1890             : 
    1891        2462 :         if (cur_needed && !pls->needed) {
    1892           0 :             pls->needed = 1;
    1893           0 :             changed = 1;
    1894           0 :             pls->cur_seq_no = select_cur_seq_no(c, pls);
    1895           0 :             pls->pb.eof_reached = 0;
    1896           0 :             if (c->cur_timestamp != AV_NOPTS_VALUE) {
    1897             :                 /* catch up */
    1898           0 :                 pls->seek_timestamp = c->cur_timestamp;
    1899           0 :                 pls->seek_flags = AVSEEK_FLAG_ANY;
    1900           0 :                 pls->seek_stream_index = -1;
    1901             :             }
    1902           0 :             av_log(s, AV_LOG_INFO, "Now receiving playlist %d, segment %d\n", i, pls->cur_seq_no);
    1903        2462 :         } else if (first && !cur_needed && pls->needed) {
    1904           0 :             if (pls->input)
    1905           0 :                 ff_format_io_close(pls->parent, &pls->input);
    1906           0 :             pls->needed = 0;
    1907           0 :             changed = 1;
    1908           0 :             av_log(s, AV_LOG_INFO, "No longer receiving playlist %d\n", i);
    1909             :         }
    1910             :     }
    1911        2462 :     return changed;
    1912             : }
    1913             : 
    1914           0 : static void fill_timing_for_id3_timestamped_stream(struct playlist *pls)
    1915             : {
    1916           0 :     if (pls->id3_offset >= 0) {
    1917           0 :         pls->pkt.dts = pls->id3_mpegts_timestamp +
    1918           0 :                                  av_rescale_q(pls->id3_offset,
    1919           0 :                                               pls->ctx->streams[pls->pkt.stream_index]->time_base,
    1920           0 :                                               MPEG_TIME_BASE_Q);
    1921           0 :         if (pls->pkt.duration)
    1922           0 :             pls->id3_offset += pls->pkt.duration;
    1923             :         else
    1924           0 :             pls->id3_offset = -1;
    1925             :     } else {
    1926             :         /* there have been packets with unknown duration
    1927             :          * since the last id3 tag, should not normally happen */
    1928           0 :         pls->pkt.dts = AV_NOPTS_VALUE;
    1929             :     }
    1930             : 
    1931           0 :     if (pls->pkt.duration)
    1932           0 :         pls->pkt.duration = av_rescale_q(pls->pkt.duration,
    1933           0 :                                          pls->ctx->streams[pls->pkt.stream_index]->time_base,
    1934           0 :                                          MPEG_TIME_BASE_Q);
    1935             : 
    1936           0 :     pls->pkt.pts = AV_NOPTS_VALUE;
    1937           0 : }
    1938             : 
    1939           4 : static AVRational get_timebase(struct playlist *pls)
    1940             : {
    1941           4 :     if (pls->is_id3_timestamped)
    1942           0 :         return MPEG_TIME_BASE_Q;
    1943             : 
    1944           4 :     return pls->ctx->streams[pls->pkt.stream_index]->time_base;
    1945             : }
    1946             : 
    1947           0 : static int compare_ts_with_wrapdetect(int64_t ts_a, struct playlist *pls_a,
    1948             :                                       int64_t ts_b, struct playlist *pls_b)
    1949             : {
    1950           0 :     int64_t scaled_ts_a = av_rescale_q(ts_a, get_timebase(pls_a), MPEG_TIME_BASE_Q);
    1951           0 :     int64_t scaled_ts_b = av_rescale_q(ts_b, get_timebase(pls_b), MPEG_TIME_BASE_Q);
    1952             : 
    1953           0 :     return av_compare_mod(scaled_ts_a, scaled_ts_b, 1LL << 33);
    1954             : }
    1955             : 
    1956        2462 : static int hls_read_packet(AVFormatContext *s, AVPacket *pkt)
    1957             : {
    1958        2462 :     HLSContext *c = s->priv_data;
    1959        2462 :     int ret, i, minplaylist = -1;
    1960             : 
    1961        2462 :     recheck_discard_flags(s, c->first_packet);
    1962        2462 :     c->first_packet = 0;
    1963             : 
    1964        4924 :     for (i = 0; i < c->n_playlists; i++) {
    1965        2462 :         struct playlist *pls = c->playlists[i];
    1966             :         /* Make sure we've got one buffered packet from each open playlist
    1967             :          * stream */
    1968        2462 :         if (pls->needed && !pls->pkt.data) {
    1969           0 :             while (1) {
    1970             :                 int64_t ts_diff;
    1971             :                 AVRational tb;
    1972        2462 :                 ret = av_read_frame(pls->ctx, &pls->pkt);
    1973        2462 :                 if (ret < 0) {
    1974           4 :                     if (!avio_feof(&pls->pb) && ret != AVERROR_EOF)
    1975           0 :                         return ret;
    1976           4 :                     reset_packet(&pls->pkt);
    1977           4 :                     break;
    1978             :                 } else {
    1979             :                     /* stream_index check prevents matching picture attachments etc. */
    1980        2458 :                     if (pls->is_id3_timestamped && pls->pkt.stream_index == 0) {
    1981             :                         /* audio elementary streams are id3 timestamped */
    1982           0 :                         fill_timing_for_id3_timestamped_stream(pls);
    1983             :                     }
    1984             : 
    1985        2462 :                     if (c->first_timestamp == AV_NOPTS_VALUE &&
    1986           4 :                         pls->pkt.dts       != AV_NOPTS_VALUE)
    1987           4 :                         c->first_timestamp = av_rescale_q(pls->pkt.dts,
    1988           4 :                             get_timebase(pls), AV_TIME_BASE_Q);
    1989             :                 }
    1990             : 
    1991        2458 :                 if (pls->seek_timestamp == AV_NOPTS_VALUE)
    1992        2458 :                     break;
    1993             : 
    1994           0 :                 if (pls->seek_stream_index < 0 ||
    1995           0 :                     pls->seek_stream_index == pls->pkt.stream_index) {
    1996             : 
    1997           0 :                     if (pls->pkt.dts == AV_NOPTS_VALUE) {
    1998           0 :                         pls->seek_timestamp = AV_NOPTS_VALUE;
    1999           0 :                         break;
    2000             :                     }
    2001             : 
    2002           0 :                     tb = get_timebase(pls);
    2003           0 :                     ts_diff = av_rescale_rnd(pls->pkt.dts, AV_TIME_BASE,
    2004           0 :                                             tb.den, AV_ROUND_DOWN) -
    2005           0 :                             pls->seek_timestamp;
    2006           0 :                     if (ts_diff >= 0 && (pls->seek_flags  & AVSEEK_FLAG_ANY ||
    2007           0 :                                         pls->pkt.flags & AV_PKT_FLAG_KEY)) {
    2008           0 :                         pls->seek_timestamp = AV_NOPTS_VALUE;
    2009           0 :                         break;
    2010             :                     }
    2011             :                 }
    2012           0 :                 av_packet_unref(&pls->pkt);
    2013           0 :                 reset_packet(&pls->pkt);
    2014             :             }
    2015             :         }
    2016             :         /* Check if this stream has the packet with the lowest dts */
    2017        2462 :         if (pls->pkt.data) {
    2018        2458 :             struct playlist *minpls = minplaylist < 0 ?
    2019        2458 :                                      NULL : c->playlists[minplaylist];
    2020        2458 :             if (minplaylist < 0) {
    2021        2458 :                 minplaylist = i;
    2022             :             } else {
    2023           0 :                 int64_t dts     =    pls->pkt.dts;
    2024           0 :                 int64_t mindts  = minpls->pkt.dts;
    2025             : 
    2026           0 :                 if (dts == AV_NOPTS_VALUE ||
    2027           0 :                     (mindts != AV_NOPTS_VALUE && compare_ts_with_wrapdetect(dts, pls, mindts, minpls) < 0))
    2028           0 :                     minplaylist = i;
    2029             :             }
    2030             :         }
    2031             :     }
    2032             : 
    2033             :     /* If we got a packet, return it */
    2034        2462 :     if (minplaylist >= 0) {
    2035        2458 :         struct playlist *pls = c->playlists[minplaylist];
    2036             :         AVStream *ist;
    2037             :         AVStream *st;
    2038             : 
    2039        2458 :         ret = update_streams_from_subdemuxer(s, pls);
    2040        2458 :         if (ret < 0) {
    2041           0 :             av_packet_unref(&pls->pkt);
    2042           0 :             reset_packet(&pls->pkt);
    2043           0 :             return ret;
    2044             :         }
    2045             : 
    2046             :         /* check if noheader flag has been cleared by the subdemuxer */
    2047        2458 :         if (pls->has_noheader_flag && !(pls->ctx->ctx_flags & AVFMTCTX_NOHEADER)) {
    2048           3 :             pls->has_noheader_flag = 0;
    2049           3 :             update_noheader_flag(s);
    2050             :         }
    2051             : 
    2052        2458 :         if (pls->pkt.stream_index >= pls->n_main_streams) {
    2053           0 :             av_log(s, AV_LOG_ERROR, "stream index inconsistency: index %d, %d main streams, %d subdemuxer streams\n",
    2054           0 :                    pls->pkt.stream_index, pls->n_main_streams, pls->ctx->nb_streams);
    2055           0 :             av_packet_unref(&pls->pkt);
    2056           0 :             reset_packet(&pls->pkt);
    2057           0 :             return AVERROR_BUG;
    2058             :         }
    2059             : 
    2060        2458 :         ist = pls->ctx->streams[pls->pkt.stream_index];
    2061        2458 :         st = pls->main_streams[pls->pkt.stream_index];
    2062             : 
    2063        2458 :         *pkt = pls->pkt;
    2064        2458 :         pkt->stream_index = st->index;
    2065        2458 :         reset_packet(&c->playlists[minplaylist]->pkt);
    2066             : 
    2067        2458 :         if (pkt->dts != AV_NOPTS_VALUE)
    2068        2458 :             c->cur_timestamp = av_rescale_q(pkt->dts,
    2069             :                                             ist->time_base,
    2070        2458 :                                             AV_TIME_BASE_Q);
    2071             : 
    2072             :         /* There may be more situations where this would be useful, but this at least
    2073             :          * handles newly probed codecs properly (i.e. request_probe by mpegts). */
    2074        2458 :         if (ist->codecpar->codec_id != st->codecpar->codec_id) {
    2075           2 :             ret = set_stream_info_from_input_stream(st, pls, ist);
    2076           2 :             if (ret < 0) {
    2077           0 :                 av_packet_unref(pkt);
    2078           0 :                 return ret;
    2079             :             }
    2080             :         }
    2081             : 
    2082        2458 :         return 0;
    2083             :     }
    2084           4 :     return AVERROR_EOF;
    2085             : }
    2086             : 
    2087           0 : static int hls_read_seek(AVFormatContext *s, int stream_index,
    2088             :                                int64_t timestamp, int flags)
    2089             : {
    2090           0 :     HLSContext *c = s->priv_data;
    2091           0 :     struct playlist *seek_pls = NULL;
    2092             :     int i, seq_no;
    2093             :     int j;
    2094             :     int stream_subdemuxer_index;
    2095             :     int64_t first_timestamp, seek_timestamp, duration;
    2096             : 
    2097           0 :     if ((flags & AVSEEK_FLAG_BYTE) ||
    2098           0 :         !(c->variants[0]->playlists[0]->finished || c->variants[0]->playlists[0]->type == PLS_TYPE_EVENT))
    2099           0 :         return AVERROR(ENOSYS);
    2100             : 
    2101           0 :     first_timestamp = c->first_timestamp == AV_NOPTS_VALUE ?
    2102           0 :                       0 : c->first_timestamp;
    2103             : 
    2104           0 :     seek_timestamp = av_rescale_rnd(timestamp, AV_TIME_BASE,
    2105           0 :                                     s->streams[stream_index]->time_base.den,
    2106           0 :                                     flags & AVSEEK_FLAG_BACKWARD ?
    2107             :                                     AV_ROUND_DOWN : AV_ROUND_UP);
    2108             : 
    2109           0 :     duration = s->duration == AV_NOPTS_VALUE ?
    2110           0 :                0 : s->duration;
    2111             : 
    2112           0 :     if (0 < duration && duration < seek_timestamp - first_timestamp)
    2113           0 :         return AVERROR(EIO);
    2114             : 
    2115             :     /* find the playlist with the specified stream */
    2116           0 :     for (i = 0; i < c->n_playlists; i++) {
    2117           0 :         struct playlist *pls = c->playlists[i];
    2118           0 :         for (j = 0; j < pls->n_main_streams; j++) {
    2119           0 :             if (pls->main_streams[j] == s->streams[stream_index]) {
    2120           0 :                 seek_pls = pls;
    2121           0 :                 stream_subdemuxer_index = j;
    2122           0 :                 break;
    2123             :             }
    2124             :         }
    2125             :     }
    2126             :     /* check if the timestamp is valid for the playlist with the
    2127             :      * specified stream index */
    2128           0 :     if (!seek_pls || !find_timestamp_in_playlist(c, seek_pls, seek_timestamp, &seq_no))
    2129           0 :         return AVERROR(EIO);
    2130             : 
    2131             :     /* set segment now so we do not need to search again below */
    2132           0 :     seek_pls->cur_seq_no = seq_no;
    2133           0 :     seek_pls->seek_stream_index = stream_subdemuxer_index;
    2134             : 
    2135           0 :     for (i = 0; i < c->n_playlists; i++) {
    2136             :         /* Reset reading */
    2137           0 :         struct playlist *pls = c->playlists[i];
    2138           0 :         if (pls->input)
    2139           0 :             ff_format_io_close(pls->parent, &pls->input);
    2140           0 :         av_packet_unref(&pls->pkt);
    2141           0 :         reset_packet(&pls->pkt);
    2142           0 :         pls->pb.eof_reached = 0;
    2143             :         /* Clear any buffered data */
    2144           0 :         pls->pb.buf_end = pls->pb.buf_ptr = pls->pb.buffer;
    2145             :         /* Reset the pos, to let the mpegts demuxer know we've seeked. */
    2146           0 :         pls->pb.pos = 0;
    2147             :         /* Flush the packet queue of the subdemuxer. */
    2148           0 :         ff_read_frame_flush(pls->ctx);
    2149             : 
    2150           0 :         pls->seek_timestamp = seek_timestamp;
    2151           0 :         pls->seek_flags = flags;
    2152             : 
    2153           0 :         if (pls != seek_pls) {
    2154             :             /* set closest segment seq_no for playlists not handled above */
    2155           0 :             find_timestamp_in_playlist(c, pls, seek_timestamp, &pls->cur_seq_no);
    2156             :             /* seek the playlist to the given position without taking
    2157             :              * keyframes into account since this playlist does not have the
    2158             :              * specified stream where we should look for the keyframes */
    2159           0 :             pls->seek_stream_index = -1;
    2160           0 :             pls->seek_flags |= AVSEEK_FLAG_ANY;
    2161             :         }
    2162             :     }
    2163             : 
    2164           0 :     c->cur_timestamp = seek_timestamp;
    2165             : 
    2166           0 :     return 0;
    2167             : }
    2168             : 
    2169        6130 : static int hls_probe(AVProbeData *p)
    2170             : {
    2171             :     /* Require #EXTM3U at the start, and either one of the ones below
    2172             :      * somewhere for a proper match. */
    2173        6130 :     if (strncmp(p->buf, "#EXTM3U", 7))
    2174        6126 :         return 0;
    2175             : 
    2176           8 :     if (strstr(p->buf, "#EXT-X-STREAM-INF:")     ||
    2177           4 :         strstr(p->buf, "#EXT-X-TARGETDURATION:") ||
    2178           0 :         strstr(p->buf, "#EXT-X-MEDIA-SEQUENCE:"))
    2179           4 :         return AVPROBE_SCORE_MAX;
    2180           0 :     return 0;
    2181             : }
    2182             : 
    2183             : #define OFFSET(x) offsetof(HLSContext, x)
    2184             : #define FLAGS AV_OPT_FLAG_DECODING_PARAM
    2185             : static const AVOption hls_options[] = {
    2186             :     {"live_start_index", "segment index to start live streams at (negative values are from the end)",
    2187             :         OFFSET(live_start_index), AV_OPT_TYPE_INT, {.i64 = -3}, INT_MIN, INT_MAX, FLAGS},
    2188             :     {"allowed_extensions", "List of file extensions that hls is allowed to access",
    2189             :         OFFSET(allowed_extensions), AV_OPT_TYPE_STRING,
    2190             :         {.str = "3gp,aac,avi,flac,mkv,m3u8,m4a,m4s,m4v,mpg,mov,mp2,mp3,mp4,mpeg,mpegts,ogg,ogv,oga,ts,vob,wav"},
    2191             :         INT_MIN, INT_MAX, FLAGS},
    2192             :     {"max_reload", "Maximum number of times a insufficient list is attempted to be reloaded",
    2193             :         OFFSET(max_reload), AV_OPT_TYPE_INT, {.i64 = 1000}, 0, INT_MAX, FLAGS},
    2194             :     {NULL}
    2195             : };
    2196             : 
    2197             : static const AVClass hls_class = {
    2198             :     .class_name = "hls,applehttp",
    2199             :     .item_name  = av_default_item_name,
    2200             :     .option     = hls_options,
    2201             :     .version    = LIBAVUTIL_VERSION_INT,
    2202             : };
    2203             : 
    2204             : AVInputFormat ff_hls_demuxer = {
    2205             :     .name           = "hls,applehttp",
    2206             :     .long_name      = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"),
    2207             :     .priv_class     = &hls_class,
    2208             :     .priv_data_size = sizeof(HLSContext),
    2209             :     .read_probe     = hls_probe,
    2210             :     .read_header    = hls_read_header,
    2211             :     .read_packet    = hls_read_packet,
    2212             :     .read_close     = hls_close,
    2213             :     .read_seek      = hls_read_seek,
    2214             : };

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