| /* |
| * Apple HTTP Live Streaming demuxer |
| * Copyright (c) 2010 Martin Storsjo |
| * Copyright (c) 2013 Anssi Hannula |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * Apple HTTP Live Streaming demuxer |
| * http://tools.ietf.org/html/draft-pantos-http-live-streaming |
| */ |
| |
| #include "libavutil/avstring.h" |
| #include "libavutil/avassert.h" |
| #include "libavutil/intreadwrite.h" |
| #include "libavutil/mathematics.h" |
| #include "libavutil/opt.h" |
| #include "libavutil/dict.h" |
| #include "libavutil/time.h" |
| #include "avformat.h" |
| #include "internal.h" |
| #include "avio_internal.h" |
| #include "url.h" |
| #include "id3v2.h" |
| |
| #define INITIAL_BUFFER_SIZE 32768 |
| |
| #define MAX_FIELD_LEN 64 |
| #define MAX_CHARACTERISTICS_LEN 512 |
| |
| #define MPEG_TIME_BASE 90000 |
| #define MPEG_TIME_BASE_Q (AVRational){1, MPEG_TIME_BASE} |
| |
| /* |
| * An apple http stream consists of a playlist with media segment files, |
| * played sequentially. There may be several playlists with the same |
| * video content, in different bandwidth variants, that are played in |
| * parallel (preferably only one bandwidth variant at a time). In this case, |
| * the user supplied the url to a main playlist that only lists the variant |
| * playlists. |
| * |
| * If the main playlist doesn't point at any variants, we still create |
| * one anonymous toplevel variant for this, to maintain the structure. |
| */ |
| |
| enum KeyType { |
| KEY_NONE, |
| KEY_AES_128, |
| KEY_SAMPLE_AES |
| }; |
| |
| struct segment { |
| int64_t duration; |
| int64_t url_offset; |
| int64_t size; |
| char *url; |
| char *key; |
| enum KeyType key_type; |
| uint8_t iv[16]; |
| }; |
| |
| struct rendition; |
| |
| enum PlaylistType { |
| PLS_TYPE_UNSPECIFIED, |
| PLS_TYPE_EVENT, |
| PLS_TYPE_VOD |
| }; |
| |
| /* |
| * Each playlist has its own demuxer. If it currently is active, |
| * it has an open AVIOContext too, and potentially an AVPacket |
| * containing the next packet from this stream. |
| */ |
| struct playlist { |
| char url[MAX_URL_SIZE]; |
| AVIOContext pb; |
| uint8_t* read_buffer; |
| URLContext *input; |
| AVFormatContext *parent; |
| int index; |
| AVFormatContext *ctx; |
| AVPacket pkt; |
| int stream_offset; |
| |
| int finished; |
| enum PlaylistType type; |
| int64_t target_duration; |
| int start_seq_no; |
| int n_segments; |
| struct segment **segments; |
| int needed, cur_needed; |
| int cur_seq_no; |
| int64_t cur_seg_offset; |
| int64_t last_load_time; |
| |
| char key_url[MAX_URL_SIZE]; |
| uint8_t key[16]; |
| |
| /* ID3 timestamp handling (elementary audio streams have ID3 timestamps |
| * (and possibly other ID3 tags) in the beginning of each segment) */ |
| int is_id3_timestamped; /* -1: not yet known */ |
| int64_t id3_mpegts_timestamp; /* in mpegts tb */ |
| int64_t id3_offset; /* in stream original tb */ |
| uint8_t* id3_buf; /* temp buffer for id3 parsing */ |
| unsigned int id3_buf_size; |
| AVDictionary *id3_initial; /* data from first id3 tag */ |
| int id3_found; /* ID3 tag found at some point */ |
| int id3_changed; /* ID3 tag data has changed at some point */ |
| ID3v2ExtraMeta *id3_deferred_extra; /* stored here until subdemuxer is opened */ |
| |
| int64_t seek_timestamp; |
| int seek_flags; |
| int seek_stream_index; /* into subdemuxer stream array */ |
| |
| /* Renditions associated with this playlist, if any. |
| * Alternative rendition playlists have a single rendition associated |
| * with them, and variant main Media Playlists may have |
| * multiple (playlist-less) renditions associated with them. */ |
| int n_renditions; |
| struct rendition **renditions; |
| }; |
| |
| /* |
| * Renditions are e.g. alternative subtitle or audio streams. |
| * The rendition may either be an external playlist or it may be |
| * contained in the main Media Playlist of the variant (in which case |
| * playlist is NULL). |
| */ |
| struct rendition { |
| enum AVMediaType type; |
| struct playlist *playlist; |
| char group_id[MAX_FIELD_LEN]; |
| char language[MAX_FIELD_LEN]; |
| char name[MAX_FIELD_LEN]; |
| int disposition; |
| }; |
| |
| struct variant { |
| int bandwidth; |
| |
| /* every variant contains at least the main Media Playlist in index 0 */ |
| int n_playlists; |
| struct playlist **playlists; |
| |
| char audio_group[MAX_FIELD_LEN]; |
| char video_group[MAX_FIELD_LEN]; |
| char subtitles_group[MAX_FIELD_LEN]; |
| }; |
| |
| typedef struct HLSContext { |
| int n_variants; |
| struct variant **variants; |
| int n_playlists; |
| struct playlist **playlists; |
| int n_renditions; |
| struct rendition **renditions; |
| |
| int cur_seq_no; |
| int first_packet; |
| int64_t first_timestamp; |
| int64_t cur_timestamp; |
| AVIOInterruptCB *interrupt_callback; |
| char *user_agent; ///< holds HTTP user agent set as an AVOption to the HTTP protocol context |
| char *cookies; ///< holds HTTP cookie values set in either the initial response or as an AVOption to the HTTP protocol context |
| char *headers; ///< holds HTTP headers set as an AVOption to the HTTP protocol context |
| } HLSContext; |
| |
| static int read_chomp_line(AVIOContext *s, char *buf, int maxlen) |
| { |
| int len = ff_get_line(s, buf, maxlen); |
| while (len > 0 && av_isspace(buf[len - 1])) |
| buf[--len] = '\0'; |
| return len; |
| } |
| |
| static void free_segment_list(struct playlist *pls) |
| { |
| int i; |
| for (i = 0; i < pls->n_segments; i++) { |
| av_freep(&pls->segments[i]->key); |
| av_freep(&pls->segments[i]->url); |
| av_freep(&pls->segments[i]); |
| } |
| av_freep(&pls->segments); |
| pls->n_segments = 0; |
| } |
| |
| static void free_playlist_list(HLSContext *c) |
| { |
| int i; |
| for (i = 0; i < c->n_playlists; i++) { |
| struct playlist *pls = c->playlists[i]; |
| free_segment_list(pls); |
| av_freep(&pls->renditions); |
| av_freep(&pls->id3_buf); |
| av_dict_free(&pls->id3_initial); |
| ff_id3v2_free_extra_meta(&pls->id3_deferred_extra); |
| av_free_packet(&pls->pkt); |
| av_freep(&pls->pb.buffer); |
| if (pls->input) |
| ffurl_close(pls->input); |
| if (pls->ctx) { |
| pls->ctx->pb = NULL; |
| avformat_close_input(&pls->ctx); |
| } |
| av_free(pls); |
| } |
| av_freep(&c->playlists); |
| av_freep(&c->cookies); |
| av_freep(&c->user_agent); |
| c->n_playlists = 0; |
| } |
| |
| static void free_variant_list(HLSContext *c) |
| { |
| int i; |
| for (i = 0; i < c->n_variants; i++) { |
| struct variant *var = c->variants[i]; |
| av_freep(&var->playlists); |
| av_free(var); |
| } |
| av_freep(&c->variants); |
| c->n_variants = 0; |
| } |
| |
| static void free_rendition_list(HLSContext *c) |
| { |
| int i; |
| for (i = 0; i < c->n_renditions; i++) |
| av_freep(&c->renditions[i]); |
| av_freep(&c->renditions); |
| c->n_renditions = 0; |
| } |
| |
| /* |
| * Used to reset a statically allocated AVPacket to a clean slate, |
| * containing no data. |
| */ |
| static void reset_packet(AVPacket *pkt) |
| { |
| av_init_packet(pkt); |
| pkt->data = NULL; |
| } |
| |
| static struct playlist *new_playlist(HLSContext *c, const char *url, |
| const char *base) |
| { |
| struct playlist *pls = av_mallocz(sizeof(struct playlist)); |
| if (!pls) |
| return NULL; |
| reset_packet(&pls->pkt); |
| ff_make_absolute_url(pls->url, sizeof(pls->url), base, url); |
| pls->seek_timestamp = AV_NOPTS_VALUE; |
| |
| pls->is_id3_timestamped = -1; |
| pls->id3_mpegts_timestamp = AV_NOPTS_VALUE; |
| |
| dynarray_add(&c->playlists, &c->n_playlists, pls); |
| return pls; |
| } |
| |
| struct variant_info { |
| char bandwidth[20]; |
| /* variant group ids: */ |
| char audio[MAX_FIELD_LEN]; |
| char video[MAX_FIELD_LEN]; |
| char subtitles[MAX_FIELD_LEN]; |
| }; |
| |
| static struct variant *new_variant(HLSContext *c, struct variant_info *info, |
| const char *url, const char *base) |
| { |
| struct variant *var; |
| struct playlist *pls; |
| |
| pls = new_playlist(c, url, base); |
| if (!pls) |
| return NULL; |
| |
| var = av_mallocz(sizeof(struct variant)); |
| if (!var) |
| return NULL; |
| |
| if (info) { |
| var->bandwidth = atoi(info->bandwidth); |
| strcpy(var->audio_group, info->audio); |
| strcpy(var->video_group, info->video); |
| strcpy(var->subtitles_group, info->subtitles); |
| } |
| |
| dynarray_add(&c->variants, &c->n_variants, var); |
| dynarray_add(&var->playlists, &var->n_playlists, pls); |
| return var; |
| } |
| |
| static void handle_variant_args(struct variant_info *info, const char *key, |
| int key_len, char **dest, int *dest_len) |
| { |
| if (!strncmp(key, "BANDWIDTH=", key_len)) { |
| *dest = info->bandwidth; |
| *dest_len = sizeof(info->bandwidth); |
| } else if (!strncmp(key, "AUDIO=", key_len)) { |
| *dest = info->audio; |
| *dest_len = sizeof(info->audio); |
| } else if (!strncmp(key, "VIDEO=", key_len)) { |
| *dest = info->video; |
| *dest_len = sizeof(info->video); |
| } else if (!strncmp(key, "SUBTITLES=", key_len)) { |
| *dest = info->subtitles; |
| *dest_len = sizeof(info->subtitles); |
| } |
| } |
| |
| struct key_info { |
| char uri[MAX_URL_SIZE]; |
| char method[11]; |
| char iv[35]; |
| }; |
| |
| static void handle_key_args(struct key_info *info, const char *key, |
| int key_len, char **dest, int *dest_len) |
| { |
| if (!strncmp(key, "METHOD=", key_len)) { |
| *dest = info->method; |
| *dest_len = sizeof(info->method); |
| } else if (!strncmp(key, "URI=", key_len)) { |
| *dest = info->uri; |
| *dest_len = sizeof(info->uri); |
| } else if (!strncmp(key, "IV=", key_len)) { |
| *dest = info->iv; |
| *dest_len = sizeof(info->iv); |
| } |
| } |
| |
| struct rendition_info { |
| char type[16]; |
| char uri[MAX_URL_SIZE]; |
| char group_id[MAX_FIELD_LEN]; |
| char language[MAX_FIELD_LEN]; |
| char assoc_language[MAX_FIELD_LEN]; |
| char name[MAX_FIELD_LEN]; |
| char defaultr[4]; |
| char forced[4]; |
| char characteristics[MAX_CHARACTERISTICS_LEN]; |
| }; |
| |
| static struct rendition *new_rendition(HLSContext *c, struct rendition_info *info, |
| const char *url_base) |
| { |
| struct rendition *rend; |
| enum AVMediaType type = AVMEDIA_TYPE_UNKNOWN; |
| char *characteristic; |
| char *chr_ptr; |
| char *saveptr; |
| |
| if (!strcmp(info->type, "AUDIO")) |
| type = AVMEDIA_TYPE_AUDIO; |
| else if (!strcmp(info->type, "VIDEO")) |
| type = AVMEDIA_TYPE_VIDEO; |
| else if (!strcmp(info->type, "SUBTITLES")) |
| type = AVMEDIA_TYPE_SUBTITLE; |
| else if (!strcmp(info->type, "CLOSED-CAPTIONS")) |
| /* CLOSED-CAPTIONS is ignored since we do not support CEA-608 CC in |
| * AVC SEI RBSP anyway */ |
| return NULL; |
| |
| if (type == AVMEDIA_TYPE_UNKNOWN) |
| return NULL; |
| |
| /* URI is mandatory for subtitles as per spec */ |
| if (type == AVMEDIA_TYPE_SUBTITLE && !info->uri[0]) |
| return NULL; |
| |
| /* TODO: handle subtitles (each segment has to parsed separately) */ |
| if (type == AVMEDIA_TYPE_SUBTITLE) |
| return NULL; |
| |
| rend = av_mallocz(sizeof(struct rendition)); |
| if (!rend) |
| return NULL; |
| |
| dynarray_add(&c->renditions, &c->n_renditions, rend); |
| |
| rend->type = type; |
| strcpy(rend->group_id, info->group_id); |
| strcpy(rend->language, info->language); |
| strcpy(rend->name, info->name); |
| |
| /* add the playlist if this is an external rendition */ |
| if (info->uri[0]) { |
| rend->playlist = new_playlist(c, info->uri, url_base); |
| if (rend->playlist) |
| dynarray_add(&rend->playlist->renditions, |
| &rend->playlist->n_renditions, rend); |
| } |
| |
| if (info->assoc_language[0]) { |
| int langlen = strlen(rend->language); |
| if (langlen < sizeof(rend->language) - 3) { |
| rend->language[langlen] = ','; |
| strncpy(rend->language + langlen + 1, info->assoc_language, |
| sizeof(rend->language) - langlen - 2); |
| } |
| } |
| |
| if (!strcmp(info->defaultr, "YES")) |
| rend->disposition |= AV_DISPOSITION_DEFAULT; |
| if (!strcmp(info->forced, "YES")) |
| rend->disposition |= AV_DISPOSITION_FORCED; |
| |
| chr_ptr = info->characteristics; |
| while ((characteristic = av_strtok(chr_ptr, ",", &saveptr))) { |
| if (!strcmp(characteristic, "public.accessibility.describes-music-and-sound")) |
| rend->disposition |= AV_DISPOSITION_HEARING_IMPAIRED; |
| else if (!strcmp(characteristic, "public.accessibility.describes-video")) |
| rend->disposition |= AV_DISPOSITION_VISUAL_IMPAIRED; |
| |
| chr_ptr = NULL; |
| } |
| |
| return rend; |
| } |
| |
| static void handle_rendition_args(struct rendition_info *info, const char *key, |
| int key_len, char **dest, int *dest_len) |
| { |
| if (!strncmp(key, "TYPE=", key_len)) { |
| *dest = info->type; |
| *dest_len = sizeof(info->type); |
| } else if (!strncmp(key, "URI=", key_len)) { |
| *dest = info->uri; |
| *dest_len = sizeof(info->uri); |
| } else if (!strncmp(key, "GROUP-ID=", key_len)) { |
| *dest = info->group_id; |
| *dest_len = sizeof(info->group_id); |
| } else if (!strncmp(key, "LANGUAGE=", key_len)) { |
| *dest = info->language; |
| *dest_len = sizeof(info->language); |
| } else if (!strncmp(key, "ASSOC-LANGUAGE=", key_len)) { |
| *dest = info->assoc_language; |
| *dest_len = sizeof(info->assoc_language); |
| } else if (!strncmp(key, "NAME=", key_len)) { |
| *dest = info->name; |
| *dest_len = sizeof(info->name); |
| } else if (!strncmp(key, "DEFAULT=", key_len)) { |
| *dest = info->defaultr; |
| *dest_len = sizeof(info->defaultr); |
| } else if (!strncmp(key, "FORCED=", key_len)) { |
| *dest = info->forced; |
| *dest_len = sizeof(info->forced); |
| } else if (!strncmp(key, "CHARACTERISTICS=", key_len)) { |
| *dest = info->characteristics; |
| *dest_len = sizeof(info->characteristics); |
| } |
| /* |
| * ignored: |
| * - AUTOSELECT: client may autoselect based on e.g. system language |
| * - INSTREAM-ID: EIA-608 closed caption number ("CC1".."CC4") |
| */ |
| } |
| |
| /* used by parse_playlist to allocate a new variant+playlist when the |
| * playlist is detected to be a Media Playlist (not Master Playlist) |
| * and we have no parent Master Playlist (parsing of which would have |
| * allocated the variant and playlist already) */ |
| static int ensure_playlist(HLSContext *c, struct playlist **pls, const char *url) |
| { |
| if (*pls) |
| return 0; |
| if (!new_variant(c, NULL, url, NULL)) |
| return AVERROR(ENOMEM); |
| *pls = c->playlists[c->n_playlists - 1]; |
| return 0; |
| } |
| |
| /* pls = NULL => Master Playlist or parentless Media Playlist |
| * pls = !NULL => parented Media Playlist, playlist+variant allocated */ |
| static int parse_playlist(HLSContext *c, const char *url, |
| struct playlist *pls, AVIOContext *in) |
| { |
| int ret = 0, is_segment = 0, is_variant = 0; |
| int64_t duration = 0; |
| enum KeyType key_type = KEY_NONE; |
| uint8_t iv[16] = ""; |
| int has_iv = 0; |
| char key[MAX_URL_SIZE] = ""; |
| char line[MAX_URL_SIZE]; |
| const char *ptr; |
| int close_in = 0; |
| int64_t seg_offset = 0; |
| int64_t seg_size = -1; |
| uint8_t *new_url = NULL; |
| struct variant_info variant_info; |
| char tmp_str[MAX_URL_SIZE]; |
| |
| if (!in) { |
| AVDictionary *opts = NULL; |
| close_in = 1; |
| /* Some HLS servers don't like being sent the range header */ |
| av_dict_set(&opts, "seekable", "0", 0); |
| |
| // broker prior HTTP options that should be consistent across requests |
| av_dict_set(&opts, "user-agent", c->user_agent, 0); |
| av_dict_set(&opts, "cookies", c->cookies, 0); |
| av_dict_set(&opts, "headers", c->headers, 0); |
| |
| ret = avio_open2(&in, url, AVIO_FLAG_READ, |
| c->interrupt_callback, &opts); |
| av_dict_free(&opts); |
| if (ret < 0) |
| return ret; |
| } |
| |
| if (av_opt_get(in, "location", AV_OPT_SEARCH_CHILDREN, &new_url) >= 0) |
| url = new_url; |
| |
| read_chomp_line(in, line, sizeof(line)); |
| if (strcmp(line, "#EXTM3U")) { |
| ret = AVERROR_INVALIDDATA; |
| goto fail; |
| } |
| |
| if (pls) { |
| free_segment_list(pls); |
| pls->finished = 0; |
| pls->type = PLS_TYPE_UNSPECIFIED; |
| } |
| while (!avio_feof(in)) { |
| read_chomp_line(in, line, sizeof(line)); |
| if (av_strstart(line, "#EXT-X-STREAM-INF:", &ptr)) { |
| is_variant = 1; |
| memset(&variant_info, 0, sizeof(variant_info)); |
| ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_variant_args, |
| &variant_info); |
| } else if (av_strstart(line, "#EXT-X-KEY:", &ptr)) { |
| struct key_info info = {{0}}; |
| ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_key_args, |
| &info); |
| key_type = KEY_NONE; |
| has_iv = 0; |
| if (!strcmp(info.method, "AES-128")) |
| key_type = KEY_AES_128; |
| if (!strcmp(info.method, "SAMPLE-AES")) |
| key_type = KEY_SAMPLE_AES; |
| if (!strncmp(info.iv, "0x", 2) || !strncmp(info.iv, "0X", 2)) { |
| ff_hex_to_data(iv, info.iv + 2); |
| has_iv = 1; |
| } |
| av_strlcpy(key, info.uri, sizeof(key)); |
| } else if (av_strstart(line, "#EXT-X-MEDIA:", &ptr)) { |
| struct rendition_info info = {{0}}; |
| ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_rendition_args, |
| &info); |
| new_rendition(c, &info, url); |
| } else if (av_strstart(line, "#EXT-X-TARGETDURATION:", &ptr)) { |
| ret = ensure_playlist(c, &pls, url); |
| if (ret < 0) |
| goto fail; |
| pls->target_duration = atoi(ptr) * AV_TIME_BASE; |
| } else if (av_strstart(line, "#EXT-X-MEDIA-SEQUENCE:", &ptr)) { |
| ret = ensure_playlist(c, &pls, url); |
| if (ret < 0) |
| goto fail; |
| pls->start_seq_no = atoi(ptr); |
| } else if (av_strstart(line, "#EXT-X-PLAYLIST-TYPE:", &ptr)) { |
| ret = ensure_playlist(c, &pls, url); |
| if (ret < 0) |
| goto fail; |
| if (!strcmp(ptr, "EVENT")) |
| pls->type = PLS_TYPE_EVENT; |
| else if (!strcmp(ptr, "VOD")) |
| pls->type = PLS_TYPE_VOD; |
| } else if (av_strstart(line, "#EXT-X-ENDLIST", &ptr)) { |
| if (pls) |
| pls->finished = 1; |
| } else if (av_strstart(line, "#EXTINF:", &ptr)) { |
| is_segment = 1; |
| duration = atof(ptr) * AV_TIME_BASE; |
| } else if (av_strstart(line, "#EXT-X-BYTERANGE:", &ptr)) { |
| seg_size = atoi(ptr); |
| ptr = strchr(ptr, '@'); |
| if (ptr) |
| seg_offset = atoi(ptr+1); |
| } else if (av_strstart(line, "#", NULL)) { |
| continue; |
| } else if (line[0]) { |
| if (is_variant) { |
| if (!new_variant(c, &variant_info, line, url)) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| is_variant = 0; |
| } |
| if (is_segment) { |
| struct segment *seg; |
| if (!pls) { |
| if (!new_variant(c, 0, url, NULL)) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| pls = c->playlists[c->n_playlists - 1]; |
| } |
| seg = av_malloc(sizeof(struct segment)); |
| if (!seg) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| seg->duration = duration; |
| seg->key_type = key_type; |
| if (has_iv) { |
| memcpy(seg->iv, iv, sizeof(iv)); |
| } else { |
| int seq = pls->start_seq_no + pls->n_segments; |
| memset(seg->iv, 0, sizeof(seg->iv)); |
| AV_WB32(seg->iv + 12, seq); |
| } |
| |
| if (key_type != KEY_NONE) { |
| ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, key); |
| seg->key = av_strdup(tmp_str); |
| if (!seg->key) { |
| av_free(seg); |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| } else { |
| seg->key = NULL; |
| } |
| |
| ff_make_absolute_url(tmp_str, sizeof(tmp_str), url, line); |
| seg->url = av_strdup(tmp_str); |
| if (!seg->url) { |
| av_free(seg->key); |
| av_free(seg); |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| |
| dynarray_add(&pls->segments, &pls->n_segments, seg); |
| is_segment = 0; |
| |
| seg->size = seg_size; |
| if (seg_size >= 0) { |
| seg->url_offset = seg_offset; |
| seg_offset += seg_size; |
| seg_size = -1; |
| } else { |
| seg->url_offset = 0; |
| seg_offset = 0; |
| } |
| } |
| } |
| } |
| if (pls) |
| pls->last_load_time = av_gettime_relative(); |
| |
| fail: |
| av_free(new_url); |
| if (close_in) |
| avio_close(in); |
| return ret; |
| } |
| |
| enum ReadFromURLMode { |
| READ_NORMAL, |
| READ_COMPLETE, |
| }; |
| |
| /* read from URLContext, limiting read to current segment */ |
| static int read_from_url(struct playlist *pls, uint8_t *buf, int buf_size, |
| enum ReadFromURLMode mode) |
| { |
| int ret; |
| struct segment *seg = pls->segments[pls->cur_seq_no - pls->start_seq_no]; |
| |
| /* limit read if the segment was only a part of a file */ |
| if (seg->size >= 0) |
| buf_size = FFMIN(buf_size, seg->size - pls->cur_seg_offset); |
| |
| if (mode == READ_COMPLETE) |
| ret = ffurl_read_complete(pls->input, buf, buf_size); |
| else |
| ret = ffurl_read(pls->input, buf, buf_size); |
| |
| if (ret > 0) |
| pls->cur_seg_offset += ret; |
| |
| return ret; |
| } |
| |
| /* Parse the raw ID3 data and pass contents to caller */ |
| static void parse_id3(AVFormatContext *s, AVIOContext *pb, |
| AVDictionary **metadata, int64_t *dts, |
| ID3v2ExtraMetaAPIC **apic, ID3v2ExtraMeta **extra_meta) |
| { |
| static const char id3_priv_owner_ts[] = "com.apple.streaming.transportStreamTimestamp"; |
| ID3v2ExtraMeta *meta; |
| |
| ff_id3v2_read_dict(pb, metadata, ID3v2_DEFAULT_MAGIC, extra_meta); |
| for (meta = *extra_meta; meta; meta = meta->next) { |
| if (!strcmp(meta->tag, "PRIV")) { |
| ID3v2ExtraMetaPRIV *priv = meta->data; |
| if (priv->datasize == 8 && !strcmp(priv->owner, id3_priv_owner_ts)) { |
| /* 33-bit MPEG timestamp */ |
| int64_t ts = AV_RB64(priv->data); |
| av_log(s, AV_LOG_DEBUG, "HLS ID3 audio timestamp %"PRId64"\n", ts); |
| if ((ts & ~((1ULL << 33) - 1)) == 0) |
| *dts = ts; |
| else |
| av_log(s, AV_LOG_ERROR, "Invalid HLS ID3 audio timestamp %"PRId64"\n", ts); |
| } |
| } else if (!strcmp(meta->tag, "APIC") && apic) |
| *apic = meta->data; |
| } |
| } |
| |
| /* Check if the ID3 metadata contents have changed */ |
| static int id3_has_changed_values(struct playlist *pls, AVDictionary *metadata, |
| ID3v2ExtraMetaAPIC *apic) |
| { |
| AVDictionaryEntry *entry = NULL; |
| AVDictionaryEntry *oldentry; |
| /* check that no keys have changed values */ |
| while ((entry = av_dict_get(metadata, "", entry, AV_DICT_IGNORE_SUFFIX))) { |
| oldentry = av_dict_get(pls->id3_initial, entry->key, NULL, AV_DICT_MATCH_CASE); |
| if (!oldentry || strcmp(oldentry->value, entry->value) != 0) |
| return 1; |
| } |
| |
| /* check if apic appeared */ |
| if (apic && (pls->ctx->nb_streams != 2 || !pls->ctx->streams[1]->attached_pic.data)) |
| return 1; |
| |
| if (apic) { |
| int size = pls->ctx->streams[1]->attached_pic.size; |
| if (size != apic->buf->size - FF_INPUT_BUFFER_PADDING_SIZE) |
| return 1; |
| |
| if (memcmp(apic->buf->data, pls->ctx->streams[1]->attached_pic.data, size) != 0) |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| /* Parse ID3 data and handle the found data */ |
| static void handle_id3(AVIOContext *pb, struct playlist *pls) |
| { |
| AVDictionary *metadata = NULL; |
| ID3v2ExtraMetaAPIC *apic = NULL; |
| ID3v2ExtraMeta *extra_meta = NULL; |
| int64_t timestamp = AV_NOPTS_VALUE; |
| |
| parse_id3(pls->ctx, pb, &metadata, ×tamp, &apic, &extra_meta); |
| |
| if (timestamp != AV_NOPTS_VALUE) { |
| pls->id3_mpegts_timestamp = timestamp; |
| pls->id3_offset = 0; |
| } |
| |
| if (!pls->id3_found) { |
| /* initial ID3 tags */ |
| av_assert0(!pls->id3_deferred_extra); |
| pls->id3_found = 1; |
| |
| /* get picture attachment and set text metadata */ |
| if (pls->ctx->nb_streams) |
| ff_id3v2_parse_apic(pls->ctx, &extra_meta); |
| else |
| /* demuxer not yet opened, defer picture attachment */ |
| pls->id3_deferred_extra = extra_meta; |
| |
| av_dict_copy(&pls->ctx->metadata, metadata, 0); |
| pls->id3_initial = metadata; |
| |
| } else { |
| if (!pls->id3_changed && id3_has_changed_values(pls, metadata, apic)) { |
| avpriv_report_missing_feature(pls->ctx, "Changing ID3 metadata in HLS audio elementary stream"); |
| pls->id3_changed = 1; |
| } |
| av_dict_free(&metadata); |
| } |
| |
| if (!pls->id3_deferred_extra) |
| ff_id3v2_free_extra_meta(&extra_meta); |
| } |
| |
| /* Intercept and handle ID3 tags between URLContext and AVIOContext */ |
| static void intercept_id3(struct playlist *pls, uint8_t *buf, |
| int buf_size, int *len) |
| { |
| /* intercept id3 tags, we do not want to pass them to the raw |
| * demuxer on all segment switches */ |
| int bytes; |
| int id3_buf_pos = 0; |
| int fill_buf = 0; |
| |
| /* gather all the id3 tags */ |
| while (1) { |
| /* see if we can retrieve enough data for ID3 header */ |
| if (*len < ID3v2_HEADER_SIZE && buf_size >= ID3v2_HEADER_SIZE) { |
| bytes = read_from_url(pls, buf + *len, ID3v2_HEADER_SIZE - *len, READ_COMPLETE); |
| if (bytes > 0) { |
| |
| if (bytes == ID3v2_HEADER_SIZE - *len) |
| /* no EOF yet, so fill the caller buffer again after |
| * we have stripped the ID3 tags */ |
| fill_buf = 1; |
| |
| *len += bytes; |
| |
| } else if (*len <= 0) { |
| /* error/EOF */ |
| *len = bytes; |
| fill_buf = 0; |
| } |
| } |
| |
| if (*len < ID3v2_HEADER_SIZE) |
| break; |
| |
| if (ff_id3v2_match(buf, ID3v2_DEFAULT_MAGIC)) { |
| struct segment *seg = pls->segments[pls->cur_seq_no - pls->start_seq_no]; |
| int64_t maxsize = seg->size >= 0 ? seg->size : 1024*1024; |
| int taglen = ff_id3v2_tag_len(buf); |
| int tag_got_bytes = FFMIN(taglen, *len); |
| int remaining = taglen - tag_got_bytes; |
| |
| if (taglen > maxsize) { |
| av_log(pls->ctx, AV_LOG_ERROR, "Too large HLS ID3 tag (%d > %"PRId64" bytes)\n", |
| taglen, maxsize); |
| break; |
| } |
| |
| /* |
| * Copy the id3 tag to our temporary id3 buffer. |
| * We could read a small id3 tag directly without memcpy, but |
| * we would still need to copy the large tags, and handling |
| * both of those cases together with the possibility for multiple |
| * tags would make the handling a bit complex. |
| */ |
| pls->id3_buf = av_fast_realloc(pls->id3_buf, &pls->id3_buf_size, id3_buf_pos + taglen); |
| if (!pls->id3_buf) |
| break; |
| memcpy(pls->id3_buf + id3_buf_pos, buf, tag_got_bytes); |
| id3_buf_pos += tag_got_bytes; |
| |
| /* strip the intercepted bytes */ |
| *len -= tag_got_bytes; |
| memmove(buf, buf + tag_got_bytes, *len); |
| av_log(pls->ctx, AV_LOG_DEBUG, "Stripped %d HLS ID3 bytes\n", tag_got_bytes); |
| |
| if (remaining > 0) { |
| /* read the rest of the tag in */ |
| if (read_from_url(pls, pls->id3_buf + id3_buf_pos, remaining, READ_COMPLETE) != remaining) |
| break; |
| id3_buf_pos += remaining; |
| av_log(pls->ctx, AV_LOG_DEBUG, "Stripped additional %d HLS ID3 bytes\n", remaining); |
| } |
| |
| } else { |
| /* no more ID3 tags */ |
| break; |
| } |
| } |
| |
| /* re-fill buffer for the caller unless EOF */ |
| if (*len >= 0 && (fill_buf || *len == 0)) { |
| bytes = read_from_url(pls, buf + *len, buf_size - *len, READ_NORMAL); |
| |
| /* ignore error if we already had some data */ |
| if (bytes >= 0) |
| *len += bytes; |
| else if (*len == 0) |
| *len = bytes; |
| } |
| |
| if (pls->id3_buf) { |
| /* Now parse all the ID3 tags */ |
| AVIOContext id3ioctx; |
| ffio_init_context(&id3ioctx, pls->id3_buf, id3_buf_pos, 0, NULL, NULL, NULL, NULL); |
| handle_id3(&id3ioctx, pls); |
| } |
| |
| if (pls->is_id3_timestamped == -1) |
| pls->is_id3_timestamped = (pls->id3_mpegts_timestamp != AV_NOPTS_VALUE); |
| } |
| |
| static void update_options(char **dest, const char *name, void *src) |
| { |
| av_freep(dest); |
| av_opt_get(src, name, 0, (uint8_t**)dest); |
| if (*dest && !strlen(*dest)) |
| av_freep(dest); |
| } |
| |
| static int open_input(HLSContext *c, struct playlist *pls) |
| { |
| AVDictionary *opts = NULL; |
| AVDictionary *opts2 = NULL; |
| int ret; |
| struct segment *seg = pls->segments[pls->cur_seq_no - pls->start_seq_no]; |
| |
| // broker prior HTTP options that should be consistent across requests |
| av_dict_set(&opts, "user-agent", c->user_agent, 0); |
| av_dict_set(&opts, "cookies", c->cookies, 0); |
| av_dict_set(&opts, "headers", c->headers, 0); |
| av_dict_set(&opts, "seekable", "0", 0); |
| |
| // Same opts for key request (ffurl_open mutilates the opts so it cannot be used twice) |
| av_dict_copy(&opts2, opts, 0); |
| |
| if (seg->size >= 0) { |
| /* try to restrict the HTTP request to the part we want |
| * (if this is in fact a HTTP request) */ |
| av_dict_set_int(&opts, "offset", seg->url_offset, 0); |
| av_dict_set_int(&opts, "end_offset", seg->url_offset + seg->size, 0); |
| } |
| |
| av_log(pls->parent, AV_LOG_VERBOSE, "HLS request for url '%s', offset %"PRId64", playlist %d\n", |
| seg->url, seg->url_offset, pls->index); |
| |
| if (seg->key_type == KEY_NONE) { |
| ret = ffurl_open(&pls->input, seg->url, AVIO_FLAG_READ, |
| &pls->parent->interrupt_callback, &opts); |
| |
| } else if (seg->key_type == KEY_AES_128) { |
| char iv[33], key[33], url[MAX_URL_SIZE]; |
| if (strcmp(seg->key, pls->key_url)) { |
| URLContext *uc; |
| if (ffurl_open(&uc, seg->key, AVIO_FLAG_READ, |
| &pls->parent->interrupt_callback, &opts2) == 0) { |
| if (ffurl_read_complete(uc, pls->key, sizeof(pls->key)) |
| != sizeof(pls->key)) { |
| av_log(NULL, AV_LOG_ERROR, "Unable to read key file %s\n", |
| seg->key); |
| } |
| update_options(&c->cookies, "cookies", uc->priv_data); |
| av_dict_set(&opts, "cookies", c->cookies, 0); |
| ffurl_close(uc); |
| } else { |
| av_log(NULL, AV_LOG_ERROR, "Unable to open key file %s\n", |
| seg->key); |
| } |
| av_strlcpy(pls->key_url, seg->key, sizeof(pls->key_url)); |
| } |
| ff_data_to_hex(iv, seg->iv, sizeof(seg->iv), 0); |
| ff_data_to_hex(key, pls->key, sizeof(pls->key), 0); |
| iv[32] = key[32] = '\0'; |
| if (strstr(seg->url, "://")) |
| snprintf(url, sizeof(url), "crypto+%s", seg->url); |
| else |
| snprintf(url, sizeof(url), "crypto:%s", seg->url); |
| if ((ret = ffurl_alloc(&pls->input, url, AVIO_FLAG_READ, |
| &pls->parent->interrupt_callback)) < 0) |
| goto cleanup; |
| av_opt_set(pls->input->priv_data, "key", key, 0); |
| av_opt_set(pls->input->priv_data, "iv", iv, 0); |
| |
| if ((ret = ffurl_connect(pls->input, &opts)) < 0) { |
| ffurl_close(pls->input); |
| pls->input = NULL; |
| goto cleanup; |
| } |
| ret = 0; |
| } else if (seg->key_type == KEY_SAMPLE_AES) { |
| av_log(pls->parent, AV_LOG_ERROR, |
| "SAMPLE-AES encryption is not supported yet\n"); |
| ret = AVERROR_PATCHWELCOME; |
| } |
| else |
| ret = AVERROR(ENOSYS); |
| |
| /* Seek to the requested position. If this was a HTTP request, the offset |
| * should already be where want it to, but this allows e.g. local testing |
| * without a HTTP server. */ |
| if (ret == 0 && seg->key_type == KEY_NONE) { |
| int seekret = ffurl_seek(pls->input, seg->url_offset, SEEK_SET); |
| if (seekret < 0) { |
| av_log(pls->parent, AV_LOG_ERROR, "Unable to seek to offset %"PRId64" of HLS segment '%s'\n", seg->url_offset, seg->url); |
| ret = seekret; |
| ffurl_close(pls->input); |
| pls->input = NULL; |
| } |
| } |
| |
| cleanup: |
| av_dict_free(&opts); |
| av_dict_free(&opts2); |
| pls->cur_seg_offset = 0; |
| return ret; |
| } |
| |
| static int64_t default_reload_interval(struct playlist *pls) |
| { |
| return pls->n_segments > 0 ? |
| pls->segments[pls->n_segments - 1]->duration : |
| pls->target_duration; |
| } |
| |
| static int read_data(void *opaque, uint8_t *buf, int buf_size) |
| { |
| struct playlist *v = opaque; |
| HLSContext *c = v->parent->priv_data; |
| int ret, i; |
| int just_opened = 0; |
| |
| restart: |
| if (!v->needed) |
| return AVERROR_EOF; |
| |
| if (!v->input) { |
| int64_t reload_interval; |
| |
| /* Check that the playlist is still needed before opening a new |
| * segment. */ |
| if (v->ctx && v->ctx->nb_streams && |
| v->parent->nb_streams >= v->stream_offset + v->ctx->nb_streams) { |
| v->needed = 0; |
| for (i = v->stream_offset; i < v->stream_offset + v->ctx->nb_streams; |
| i++) { |
| if (v->parent->streams[i]->discard < AVDISCARD_ALL) |
| v->needed = 1; |
| } |
| } |
| if (!v->needed) { |
| av_log(v->parent, AV_LOG_INFO, "No longer receiving playlist %d\n", |
| v->index); |
| return AVERROR_EOF; |
| } |
| |
| /* If this is a live stream and the reload interval has elapsed since |
| * the last playlist reload, reload the playlists now. */ |
| reload_interval = default_reload_interval(v); |
| |
| reload: |
| if (!v->finished && |
| av_gettime_relative() - v->last_load_time >= reload_interval) { |
| if ((ret = parse_playlist(c, v->url, v, NULL)) < 0) { |
| av_log(v->parent, AV_LOG_WARNING, "Failed to reload playlist %d\n", |
| v->index); |
| return ret; |
| } |
| /* If we need to reload the playlist again below (if |
| * there's still no more segments), switch to a reload |
| * interval of half the target duration. */ |
| reload_interval = v->target_duration / 2; |
| } |
| if (v->cur_seq_no < v->start_seq_no) { |
| av_log(NULL, AV_LOG_WARNING, |
| "skipping %d segments ahead, expired from playlists\n", |
| v->start_seq_no - v->cur_seq_no); |
| v->cur_seq_no = v->start_seq_no; |
| } |
| if (v->cur_seq_no >= v->start_seq_no + v->n_segments) { |
| if (v->finished) |
| return AVERROR_EOF; |
| while (av_gettime_relative() - v->last_load_time < reload_interval) { |
| if (ff_check_interrupt(c->interrupt_callback)) |
| return AVERROR_EXIT; |
| av_usleep(100*1000); |
| } |
| /* Enough time has elapsed since the last reload */ |
| goto reload; |
| } |
| |
| ret = open_input(c, v); |
| if (ret < 0) { |
| av_log(v->parent, AV_LOG_WARNING, "Failed to open segment of playlist %d\n", |
| v->index); |
| return ret; |
| } |
| just_opened = 1; |
| } |
| |
| ret = read_from_url(v, buf, buf_size, READ_NORMAL); |
| if (ret > 0) { |
| if (just_opened && v->is_id3_timestamped != 0) { |
| /* Intercept ID3 tags here, elementary audio streams are required |
| * to convey timestamps using them in the beginning of each segment. */ |
| intercept_id3(v, buf, buf_size, &ret); |
| } |
| |
| return ret; |
| } |
| ffurl_close(v->input); |
| v->input = NULL; |
| v->cur_seq_no++; |
| |
| c->cur_seq_no = v->cur_seq_no; |
| |
| goto restart; |
| } |
| |
| static int playlist_in_multiple_variants(HLSContext *c, struct playlist *pls) |
| { |
| int variant_count = 0; |
| int i, j; |
| |
| for (i = 0; i < c->n_variants && variant_count < 2; i++) { |
| struct variant *v = c->variants[i]; |
| |
| for (j = 0; j < v->n_playlists; j++) { |
| if (v->playlists[j] == pls) { |
| variant_count++; |
| break; |
| } |
| } |
| } |
| |
| return variant_count >= 2; |
| } |
| |
| static void add_renditions_to_variant(HLSContext *c, struct variant *var, |
| enum AVMediaType type, const char *group_id) |
| { |
| int i; |
| |
| for (i = 0; i < c->n_renditions; i++) { |
| struct rendition *rend = c->renditions[i]; |
| |
| if (rend->type == type && !strcmp(rend->group_id, group_id)) { |
| |
| if (rend->playlist) |
| /* rendition is an external playlist |
| * => add the playlist to the variant */ |
| dynarray_add(&var->playlists, &var->n_playlists, rend->playlist); |
| else |
| /* rendition is part of the variant main Media Playlist |
| * => add the rendition to the main Media Playlist */ |
| dynarray_add(&var->playlists[0]->renditions, |
| &var->playlists[0]->n_renditions, |
| rend); |
| } |
| } |
| } |
| |
| static void add_metadata_from_renditions(AVFormatContext *s, struct playlist *pls, |
| enum AVMediaType type) |
| { |
| int rend_idx = 0; |
| int i; |
| |
| for (i = 0; i < pls->ctx->nb_streams; i++) { |
| AVStream *st = s->streams[pls->stream_offset + i]; |
| |
| if (st->codec->codec_type != type) |
| continue; |
| |
| for (; rend_idx < pls->n_renditions; rend_idx++) { |
| struct rendition *rend = pls->renditions[rend_idx]; |
| |
| if (rend->type != type) |
| continue; |
| |
| if (rend->language[0]) |
| av_dict_set(&st->metadata, "language", rend->language, 0); |
| if (rend->name[0]) |
| av_dict_set(&st->metadata, "comment", rend->name, 0); |
| |
| st->disposition |= rend->disposition; |
| } |
| if (rend_idx >=pls->n_renditions) |
| break; |
| } |
| } |
| |
| /* if timestamp was in valid range: returns 1 and sets seq_no |
| * if not: returns 0 and sets seq_no to closest segment */ |
| static int find_timestamp_in_playlist(HLSContext *c, struct playlist *pls, |
| int64_t timestamp, int *seq_no) |
| { |
| int i; |
| int64_t pos = c->first_timestamp == AV_NOPTS_VALUE ? |
| 0 : c->first_timestamp; |
| |
| if (timestamp < pos) { |
| *seq_no = pls->start_seq_no; |
| return 0; |
| } |
| |
| for (i = 0; i < pls->n_segments; i++) { |
| int64_t diff = pos + pls->segments[i]->duration - timestamp; |
| if (diff > 0) { |
| *seq_no = pls->start_seq_no + i; |
| return 1; |
| } |
| pos += pls->segments[i]->duration; |
| } |
| |
| *seq_no = pls->start_seq_no + pls->n_segments - 1; |
| |
| return 0; |
| } |
| |
| static int select_cur_seq_no(HLSContext *c, struct playlist *pls) |
| { |
| int seq_no; |
| |
| if (!pls->finished && !c->first_packet && |
| av_gettime_relative() - pls->last_load_time >= default_reload_interval(pls)) |
| /* reload the playlist since it was suspended */ |
| parse_playlist(c, pls->url, pls, NULL); |
| |
| /* If playback is already in progress (we are just selecting a new |
| * playlist) and this is a complete file, find the matching segment |
| * by counting durations. */ |
| if (pls->finished && c->cur_timestamp != AV_NOPTS_VALUE) { |
| find_timestamp_in_playlist(c, pls, c->cur_timestamp, &seq_no); |
| return seq_no; |
| } |
| |
| if (!pls->finished) { |
| if (!c->first_packet && /* we are doing a segment selection during playback */ |
| c->cur_seq_no >= pls->start_seq_no && |
| c->cur_seq_no < pls->start_seq_no + pls->n_segments) |
| /* While spec 3.4.3 says that we cannot assume anything about the |
| * content at the same sequence number on different playlists, |
| * in practice this seems to work and doing it otherwise would |
| * require us to download a segment to inspect its timestamps. */ |
| return c->cur_seq_no; |
| |
| /* If this is a live stream with more than 3 segments, start at the |
| * third last segment. */ |
| if (pls->n_segments > 3) |
| return pls->start_seq_no + pls->n_segments - 3; |
| } |
| |
| /* Otherwise just start on the first segment. */ |
| return pls->start_seq_no; |
| } |
| |
| static int hls_read_header(AVFormatContext *s) |
| { |
| URLContext *u = (s->flags & AVFMT_FLAG_CUSTOM_IO) ? NULL : s->pb->opaque; |
| HLSContext *c = s->priv_data; |
| int ret = 0, i, j, stream_offset = 0; |
| |
| c->interrupt_callback = &s->interrupt_callback; |
| |
| c->first_packet = 1; |
| c->first_timestamp = AV_NOPTS_VALUE; |
| c->cur_timestamp = AV_NOPTS_VALUE; |
| |
| // if the URL context is good, read important options we must broker later |
| if (u && u->prot->priv_data_class) { |
| // get the previous user agent & set back to null if string size is zero |
| update_options(&c->user_agent, "user-agent", u->priv_data); |
| |
| // get the previous cookies & set back to null if string size is zero |
| update_options(&c->cookies, "cookies", u->priv_data); |
| |
| // get the previous headers & set back to null if string size is zero |
| update_options(&c->headers, "headers", u->priv_data); |
| } |
| |
| if ((ret = parse_playlist(c, s->filename, NULL, s->pb)) < 0) |
| goto fail; |
| |
| if (c->n_variants == 0) { |
| av_log(NULL, AV_LOG_WARNING, "Empty playlist\n"); |
| ret = AVERROR_EOF; |
| goto fail; |
| } |
| /* If the playlist only contained playlists (Master Playlist), |
| * parse each individual playlist. */ |
| if (c->n_playlists > 1 || c->playlists[0]->n_segments == 0) { |
| for (i = 0; i < c->n_playlists; i++) { |
| struct playlist *pls = c->playlists[i]; |
| if ((ret = parse_playlist(c, pls->url, pls, NULL)) < 0) |
| goto fail; |
| } |
| } |
| |
| if (c->variants[0]->playlists[0]->n_segments == 0) { |
| av_log(NULL, AV_LOG_WARNING, "Empty playlist\n"); |
| ret = AVERROR_EOF; |
| goto fail; |
| } |
| |
| /* If this isn't a live stream, calculate the total duration of the |
| * stream. */ |
| if (c->variants[0]->playlists[0]->finished) { |
| int64_t duration = 0; |
| for (i = 0; i < c->variants[0]->playlists[0]->n_segments; i++) |
| duration += c->variants[0]->playlists[0]->segments[i]->duration; |
| s->duration = duration; |
| } |
| |
| /* Associate renditions with variants */ |
| for (i = 0; i < c->n_variants; i++) { |
| struct variant *var = c->variants[i]; |
| |
| if (var->audio_group[0]) |
| add_renditions_to_variant(c, var, AVMEDIA_TYPE_AUDIO, var->audio_group); |
| if (var->video_group[0]) |
| add_renditions_to_variant(c, var, AVMEDIA_TYPE_VIDEO, var->video_group); |
| if (var->subtitles_group[0]) |
| add_renditions_to_variant(c, var, AVMEDIA_TYPE_SUBTITLE, var->subtitles_group); |
| } |
| |
| /* Open the demuxer for each playlist */ |
| for (i = 0; i < c->n_playlists; i++) { |
| struct playlist *pls = c->playlists[i]; |
| AVInputFormat *in_fmt = NULL; |
| |
| if (!(pls->ctx = avformat_alloc_context())) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| |
| if (pls->n_segments == 0) |
| continue; |
| |
| pls->index = i; |
| pls->needed = 1; |
| pls->parent = s; |
| pls->cur_seq_no = select_cur_seq_no(c, pls); |
| |
| pls->read_buffer = av_malloc(INITIAL_BUFFER_SIZE); |
| ffio_init_context(&pls->pb, pls->read_buffer, INITIAL_BUFFER_SIZE, 0, pls, |
| read_data, NULL, NULL); |
| pls->pb.seekable = 0; |
| ret = av_probe_input_buffer(&pls->pb, &in_fmt, pls->segments[0]->url, |
| NULL, 0, 0); |
| if (ret < 0) { |
| /* Free the ctx - it isn't initialized properly at this point, |
| * so avformat_close_input shouldn't be called. If |
| * avformat_open_input fails below, it frees and zeros the |
| * context, so it doesn't need any special treatment like this. */ |
| av_log(s, AV_LOG_ERROR, "Error when loading first segment '%s'\n", pls->segments[0]->url); |
| avformat_free_context(pls->ctx); |
| pls->ctx = NULL; |
| goto fail; |
| } |
| pls->ctx->pb = &pls->pb; |
| pls->stream_offset = stream_offset; |
| |
| if ((ret = ff_copy_whitelists(pls->ctx, s)) < 0) |
| goto fail; |
| |
| ret = avformat_open_input(&pls->ctx, pls->segments[0]->url, in_fmt, NULL); |
| if (ret < 0) |
| goto fail; |
| |
| if (pls->id3_deferred_extra && pls->ctx->nb_streams == 1) { |
| ff_id3v2_parse_apic(pls->ctx, &pls->id3_deferred_extra); |
| avformat_queue_attached_pictures(pls->ctx); |
| ff_id3v2_free_extra_meta(&pls->id3_deferred_extra); |
| pls->id3_deferred_extra = NULL; |
| } |
| |
| pls->ctx->ctx_flags &= ~AVFMTCTX_NOHEADER; |
| ret = avformat_find_stream_info(pls->ctx, NULL); |
| if (ret < 0) |
| goto fail; |
| |
| if (pls->is_id3_timestamped == -1) |
| av_log(s, AV_LOG_WARNING, "No expected HTTP requests have been made\n"); |
| |
| /* Create new AVStreams for each stream in this playlist */ |
| for (j = 0; j < pls->ctx->nb_streams; j++) { |
| AVStream *st = avformat_new_stream(s, NULL); |
| AVStream *ist = pls->ctx->streams[j]; |
| if (!st) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| st->id = i; |
| |
| avcodec_copy_context(st->codec, pls->ctx->streams[j]->codec); |
| |
| if (pls->is_id3_timestamped) /* custom timestamps via id3 */ |
| avpriv_set_pts_info(st, 33, 1, MPEG_TIME_BASE); |
| else |
| avpriv_set_pts_info(st, ist->pts_wrap_bits, ist->time_base.num, ist->time_base.den); |
| } |
| |
| add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_AUDIO); |
| add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_VIDEO); |
| add_metadata_from_renditions(s, pls, AVMEDIA_TYPE_SUBTITLE); |
| |
| stream_offset += pls->ctx->nb_streams; |
| } |
| |
| /* Create a program for each variant */ |
| for (i = 0; i < c->n_variants; i++) { |
| struct variant *v = c->variants[i]; |
| AVProgram *program; |
| |
| program = av_new_program(s, i); |
| if (!program) |
| goto fail; |
| av_dict_set_int(&program->metadata, "variant_bitrate", v->bandwidth, 0); |
| |
| for (j = 0; j < v->n_playlists; j++) { |
| struct playlist *pls = v->playlists[j]; |
| int is_shared = playlist_in_multiple_variants(c, pls); |
| int k; |
| |
| for (k = 0; k < pls->ctx->nb_streams; k++) { |
| struct AVStream *st = s->streams[pls->stream_offset + k]; |
| |
| ff_program_add_stream_index(s, i, pls->stream_offset + k); |
| |
| /* Set variant_bitrate for streams unique to this variant */ |
| if (!is_shared && v->bandwidth) |
| av_dict_set_int(&st->metadata, "variant_bitrate", v->bandwidth, 0); |
| } |
| } |
| } |
| |
| return 0; |
| fail: |
| free_playlist_list(c); |
| free_variant_list(c); |
| free_rendition_list(c); |
| return ret; |
| } |
| |
| static int recheck_discard_flags(AVFormatContext *s, int first) |
| { |
| HLSContext *c = s->priv_data; |
| int i, changed = 0; |
| |
| /* Check if any new streams are needed */ |
| for (i = 0; i < c->n_playlists; i++) |
| c->playlists[i]->cur_needed = 0; |
| |
| for (i = 0; i < s->nb_streams; i++) { |
| AVStream *st = s->streams[i]; |
| struct playlist *pls = c->playlists[s->streams[i]->id]; |
| if (st->discard < AVDISCARD_ALL) |
| pls->cur_needed = 1; |
| } |
| for (i = 0; i < c->n_playlists; i++) { |
| struct playlist *pls = c->playlists[i]; |
| if (pls->cur_needed && !pls->needed) { |
| pls->needed = 1; |
| changed = 1; |
| pls->cur_seq_no = select_cur_seq_no(c, pls); |
| pls->pb.eof_reached = 0; |
| if (c->cur_timestamp != AV_NOPTS_VALUE) { |
| /* catch up */ |
| pls->seek_timestamp = c->cur_timestamp; |
| pls->seek_flags = AVSEEK_FLAG_ANY; |
| pls->seek_stream_index = -1; |
| } |
| av_log(s, AV_LOG_INFO, "Now receiving playlist %d, segment %d\n", i, pls->cur_seq_no); |
| } else if (first && !pls->cur_needed && pls->needed) { |
| if (pls->input) |
| ffurl_close(pls->input); |
| pls->input = NULL; |
| pls->needed = 0; |
| changed = 1; |
| av_log(s, AV_LOG_INFO, "No longer receiving playlist %d\n", i); |
| } |
| } |
| return changed; |
| } |
| |
| static void fill_timing_for_id3_timestamped_stream(struct playlist *pls) |
| { |
| if (pls->id3_offset >= 0) { |
| pls->pkt.dts = pls->id3_mpegts_timestamp + |
| av_rescale_q(pls->id3_offset, |
| pls->ctx->streams[pls->pkt.stream_index]->time_base, |
| MPEG_TIME_BASE_Q); |
| if (pls->pkt.duration) |
| pls->id3_offset += pls->pkt.duration; |
| else |
| pls->id3_offset = -1; |
| } else { |
| /* there have been packets with unknown duration |
| * since the last id3 tag, should not normally happen */ |
| pls->pkt.dts = AV_NOPTS_VALUE; |
| } |
| |
| if (pls->pkt.duration) |
| pls->pkt.duration = av_rescale_q(pls->pkt.duration, |
| pls->ctx->streams[pls->pkt.stream_index]->time_base, |
| MPEG_TIME_BASE_Q); |
| |
| pls->pkt.pts = AV_NOPTS_VALUE; |
| } |
| |
| static AVRational get_timebase(struct playlist *pls) |
| { |
| if (pls->is_id3_timestamped) |
| return MPEG_TIME_BASE_Q; |
| |
| return pls->ctx->streams[pls->pkt.stream_index]->time_base; |
| } |
| |
| static int compare_ts_with_wrapdetect(int64_t ts_a, struct playlist *pls_a, |
| int64_t ts_b, struct playlist *pls_b) |
| { |
| int64_t scaled_ts_a = av_rescale_q(ts_a, get_timebase(pls_a), MPEG_TIME_BASE_Q); |
| int64_t scaled_ts_b = av_rescale_q(ts_b, get_timebase(pls_b), MPEG_TIME_BASE_Q); |
| |
| return av_compare_mod(scaled_ts_a, scaled_ts_b, 1LL << 33); |
| } |
| |
| static int hls_read_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| HLSContext *c = s->priv_data; |
| int ret, i, minplaylist = -1; |
| |
| recheck_discard_flags(s, c->first_packet); |
| |
| for (i = 0; i < c->n_playlists; i++) { |
| struct playlist *pls = c->playlists[i]; |
| /* Make sure we've got one buffered packet from each open playlist |
| * stream */ |
| if (pls->needed && !pls->pkt.data) { |
| while (1) { |
| int64_t ts_diff; |
| AVRational tb; |
| ret = av_read_frame(pls->ctx, &pls->pkt); |
| if (ret < 0) { |
| if (!avio_feof(&pls->pb) && ret != AVERROR_EOF) |
| return ret; |
| reset_packet(&pls->pkt); |
| break; |
| } else { |
| /* stream_index check prevents matching picture attachments etc. */ |
| if (pls->is_id3_timestamped && pls->pkt.stream_index == 0) { |
| /* audio elementary streams are id3 timestamped */ |
| fill_timing_for_id3_timestamped_stream(pls); |
| } |
| |
| if (c->first_timestamp == AV_NOPTS_VALUE && |
| pls->pkt.dts != AV_NOPTS_VALUE) |
| c->first_timestamp = av_rescale_q(pls->pkt.dts, |
| get_timebase(pls), AV_TIME_BASE_Q); |
| } |
| |
| if (pls->seek_timestamp == AV_NOPTS_VALUE) |
| break; |
| |
| if (pls->seek_stream_index < 0 || |
| pls->seek_stream_index == pls->pkt.stream_index) { |
| |
| if (pls->pkt.dts == AV_NOPTS_VALUE) { |
| pls->seek_timestamp = AV_NOPTS_VALUE; |
| break; |
| } |
| |
| tb = get_timebase(pls); |
| ts_diff = av_rescale_rnd(pls->pkt.dts, AV_TIME_BASE, |
| tb.den, AV_ROUND_DOWN) - |
| pls->seek_timestamp; |
| if (ts_diff >= 0 && (pls->seek_flags & AVSEEK_FLAG_ANY || |
| pls->pkt.flags & AV_PKT_FLAG_KEY)) { |
| pls->seek_timestamp = AV_NOPTS_VALUE; |
| break; |
| } |
| } |
| av_free_packet(&pls->pkt); |
| reset_packet(&pls->pkt); |
| } |
| } |
| /* Check if this stream has the packet with the lowest dts */ |
| if (pls->pkt.data) { |
| struct playlist *minpls = minplaylist < 0 ? |
| NULL : c->playlists[minplaylist]; |
| if (minplaylist < 0) { |
| minplaylist = i; |
| } else { |
| int64_t dts = pls->pkt.dts; |
| int64_t mindts = minpls->pkt.dts; |
| |
| if (dts == AV_NOPTS_VALUE || |
| (mindts != AV_NOPTS_VALUE && compare_ts_with_wrapdetect(dts, pls, mindts, minpls) < 0)) |
| minplaylist = i; |
| } |
| } |
| } |
| |
| /* If we got a packet, return it */ |
| if (minplaylist >= 0) { |
| struct playlist *pls = c->playlists[minplaylist]; |
| *pkt = pls->pkt; |
| pkt->stream_index += pls->stream_offset; |
| reset_packet(&c->playlists[minplaylist]->pkt); |
| |
| if (pkt->dts != AV_NOPTS_VALUE) |
| c->cur_timestamp = av_rescale_q(pkt->dts, |
| pls->ctx->streams[pls->pkt.stream_index]->time_base, |
| AV_TIME_BASE_Q); |
| |
| return 0; |
| } |
| return AVERROR_EOF; |
| } |
| |
| static int hls_close(AVFormatContext *s) |
| { |
| HLSContext *c = s->priv_data; |
| |
| free_playlist_list(c); |
| free_variant_list(c); |
| free_rendition_list(c); |
| return 0; |
| } |
| |
| static int hls_read_seek(AVFormatContext *s, int stream_index, |
| int64_t timestamp, int flags) |
| { |
| HLSContext *c = s->priv_data; |
| struct playlist *seek_pls = NULL; |
| int i, seq_no; |
| int64_t first_timestamp, seek_timestamp, duration; |
| |
| if ((flags & AVSEEK_FLAG_BYTE) || |
| !(c->variants[0]->playlists[0]->finished || c->variants[0]->playlists[0]->type == PLS_TYPE_EVENT)) |
| return AVERROR(ENOSYS); |
| |
| first_timestamp = c->first_timestamp == AV_NOPTS_VALUE ? |
| 0 : c->first_timestamp; |
| |
| seek_timestamp = av_rescale_rnd(timestamp, AV_TIME_BASE, |
| s->streams[stream_index]->time_base.den, |
| flags & AVSEEK_FLAG_BACKWARD ? |
| AV_ROUND_DOWN : AV_ROUND_UP); |
| |
| duration = s->duration == AV_NOPTS_VALUE ? |
| 0 : s->duration; |
| |
| if (0 < duration && duration < seek_timestamp - first_timestamp) |
| return AVERROR(EIO); |
| |
| /* find the playlist with the specified stream */ |
| for (i = 0; i < c->n_playlists; i++) { |
| struct playlist *pls = c->playlists[i]; |
| if (stream_index >= pls->stream_offset && |
| stream_index - pls->stream_offset < pls->ctx->nb_streams) { |
| seek_pls = pls; |
| break; |
| } |
| } |
| /* check if the timestamp is valid for the playlist with the |
| * specified stream index */ |
| if (!seek_pls || !find_timestamp_in_playlist(c, seek_pls, seek_timestamp, &seq_no)) |
| return AVERROR(EIO); |
| |
| /* set segment now so we do not need to search again below */ |
| seek_pls->cur_seq_no = seq_no; |
| seek_pls->seek_stream_index = stream_index - seek_pls->stream_offset; |
| |
| for (i = 0; i < c->n_playlists; i++) { |
| /* Reset reading */ |
| struct playlist *pls = c->playlists[i]; |
| if (pls->input) { |
| ffurl_close(pls->input); |
| pls->input = NULL; |
| } |
| av_free_packet(&pls->pkt); |
| reset_packet(&pls->pkt); |
| pls->pb.eof_reached = 0; |
| /* Clear any buffered data */ |
| pls->pb.buf_end = pls->pb.buf_ptr = pls->pb.buffer; |
| /* Reset the pos, to let the mpegts demuxer know we've seeked. */ |
| pls->pb.pos = 0; |
| /* Flush the packet queue of the subdemuxer. */ |
| ff_read_frame_flush(pls->ctx); |
| |
| pls->seek_timestamp = seek_timestamp; |
| pls->seek_flags = flags; |
| |
| if (pls != seek_pls) { |
| /* set closest segment seq_no for playlists not handled above */ |
| find_timestamp_in_playlist(c, pls, seek_timestamp, &pls->cur_seq_no); |
| /* seek the playlist to the given position without taking |
| * keyframes into account since this playlist does not have the |
| * specified stream where we should look for the keyframes */ |
| pls->seek_stream_index = -1; |
| pls->seek_flags |= AVSEEK_FLAG_ANY; |
| } |
| } |
| |
| c->cur_timestamp = seek_timestamp; |
| |
| return 0; |
| } |
| |
| static int hls_probe(AVProbeData *p) |
| { |
| /* Require #EXTM3U at the start, and either one of the ones below |
| * somewhere for a proper match. */ |
| if (strncmp(p->buf, "#EXTM3U", 7)) |
| return 0; |
| if (strstr(p->buf, "#EXT-X-STREAM-INF:") || |
| strstr(p->buf, "#EXT-X-TARGETDURATION:") || |
| strstr(p->buf, "#EXT-X-MEDIA-SEQUENCE:")) |
| return AVPROBE_SCORE_MAX; |
| return 0; |
| } |
| |
| AVInputFormat ff_hls_demuxer = { |
| .name = "hls,applehttp", |
| .long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"), |
| .priv_data_size = sizeof(HLSContext), |
| .read_probe = hls_probe, |
| .read_header = hls_read_header, |
| .read_packet = hls_read_packet, |
| .read_close = hls_close, |
| .read_seek = hls_read_seek, |
| }; |