/* * 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 "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]; /* associated Media Initialization Section, treated as a segment */ struct segment *init_section; }; 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; AVIOContext *input; AVFormatContext *parent; int index; AVFormatContext *ctx; AVPacket pkt; /* main demuxer streams associated with this playlist * indexed by the subdemuxer stream indexes */ AVStream **main_streams; int n_main_streams; 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; /* Currently active Media Initialization Section */ struct segment *cur_init_section; uint8_t *init_sec_buf; unsigned int init_sec_buf_size; unsigned int init_sec_data_len; unsigned int init_sec_buf_read_offset; 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; /* Media Initialization Sections (EXT-X-MAP) associated with this * playlist, if any. */ int n_init_sections; struct segment **init_sections; }; /* * 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 { AVClass *class; AVFormatContext *ctx; int n_variants; struct variant **variants; int n_playlists; struct playlist **playlists; int n_renditions; struct rendition **renditions; int cur_seq_no; int live_start_index; 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 char *http_proxy; ///< holds the address of the HTTP proxy server AVDictionary *avio_opts; int strict_std_compliance; } 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_init_section_list(struct playlist *pls) { int i; for (i = 0; i < pls->n_init_sections; i++) { av_freep(&pls->init_sections[i]->url); av_freep(&pls->init_sections[i]); } av_freep(&pls->init_sections); pls->n_init_sections = 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); free_init_section_list(pls); av_freep(&pls->main_streams); 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_freep(&pls->init_sec_buf); av_packet_unref(&pls->pkt); av_freep(&pls->pb.buffer); if (pls->input) ff_format_io_close(c->ctx, &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); av_freep(&c->headers); av_freep(&c->http_proxy); 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 init_section_info { char uri[MAX_URL_SIZE]; char byterange[32]; }; static struct segment *new_init_section(struct playlist *pls, struct init_section_info *info, const char *url_base) { struct segment *sec; char *ptr; char tmp_str[MAX_URL_SIZE]; if (!info->uri[0]) return NULL; sec = av_mallocz(sizeof(*sec)); if (!sec) return NULL; ff_make_absolute_url(tmp_str, sizeof(tmp_str), url_base, info->uri); sec->url = av_strdup(tmp_str); if (!sec->url) { av_free(sec); return NULL; } if (info->byterange[0]) { sec->size = atoi(info->byterange); ptr = strchr(info->byterange, '@'); if (ptr) sec->url_offset = atoi(ptr+1); } else { /* the entire file is the init section */ sec->size = -1; } dynarray_add(&pls->init_sections, &pls->n_init_sections, sec); return sec; } static void handle_init_section_args(struct init_section_info *info, const char *key, int key_len, char **dest, int *dest_len) { if (!strncmp(key, "URI=", key_len)) { *dest = info->uri; *dest_len = sizeof(info->uri); } else if (!strncmp(key, "BYTERANGE=", key_len)) { *dest = info->byterange; *dest_len = sizeof(info->byterange); } } 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 (c->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) 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) * *pls == NULL => Master Playlist or parentless Media Playlist * *pls != NULL => parented Media Playlist, playlist+variant allocated */ 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; } static void update_options(char **dest, const char *name, void *src) { av_freep(dest); av_opt_get(src, name, AV_OPT_SEARCH_CHILDREN, (uint8_t**)dest); if (*dest && !strlen(*dest)) av_freep(dest); } static int open_url(AVFormatContext *s, AVIOContext **pb, const char *url, AVDictionary *opts, AVDictionary *opts2, int *is_http) { HLSContext *c = s->priv_data; AVDictionary *tmp = NULL; const char *proto_name = NULL; int ret; av_dict_copy(&tmp, opts, 0); av_dict_copy(&tmp, opts2, 0); if (av_strstart(url, "crypto", NULL)) { if (url[6] == '+' || url[6] == ':') proto_name = avio_find_protocol_name(url + 7); } if (!proto_name) proto_name = avio_find_protocol_name(url); if (!proto_name) return AVERROR_INVALIDDATA; // only http(s) & file are allowed if (!av_strstart(proto_name, "http", NULL) && !av_strstart(proto_name, "file", NULL)) return AVERROR_INVALIDDATA; if (!strncmp(proto_name, url, strlen(proto_name)) && url[strlen(proto_name)] == ':') ; else if (av_strstart(url, "crypto", NULL) && !strncmp(proto_name, url + 7, strlen(proto_name)) && url[7 + strlen(proto_name)] == ':') ; else if (strcmp(proto_name, "file") || !strncmp(url, "file,", 5)) return AVERROR_INVALIDDATA; ret = s->io_open(s, pb, url, AVIO_FLAG_READ, &tmp); if (ret >= 0) { // update cookies on http response with setcookies. void *u = (s->flags & AVFMT_FLAG_CUSTOM_IO) ? NULL : s->pb; update_options(&c->cookies, "cookies", u); av_dict_set(&opts, "cookies", c->cookies, 0); } av_dict_free(&tmp); if (is_http) *is_http = av_strstart(proto_name, "http", NULL); return ret; } 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]; struct segment *cur_init_section = NULL; if (!in) { #if 1 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); av_dict_set(&opts, "http_proxy", c->http_proxy, 0); ret = c->ctx->io_open(c->ctx, &in, url, AVIO_FLAG_READ, &opts); av_dict_free(&opts); if (ret < 0) return ret; #else ret = open_in(c, &in, url); if (ret < 0) return ret; close_in = 1; #endif } 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-MAP:", &ptr)) { struct init_section_info info = {{0}}; ret = ensure_playlist(c, &pls, url); if (ret < 0) goto fail; ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_init_section_args, &info); cur_init_section = new_init_section(pls, &info, url); } 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; } seg->init_section = cur_init_section; } } } if (pls) pls->last_load_time = av_gettime_relative(); fail: av_free(new_url); if (close_in) ff_format_io_close(c->ctx, &in); return ret; } static struct segment *current_segment(struct playlist *pls) { return pls->segments[pls->cur_seq_no - pls->start_seq_no]; } enum ReadFromURLMode { READ_NORMAL, READ_COMPLETE, }; static int read_from_url(struct playlist *pls, struct segment *seg, uint8_t *buf, int buf_size, enum ReadFromURLMode mode) { int ret; /* 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 = avio_read(pls->input, buf, buf_size); if (ret != buf_size) av_log(NULL, AV_LOG_ERROR, "Could not read complete segment.\n"); } else ret = avio_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 - AV_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); } 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; struct segment *seg = current_segment(pls); /* 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, seg, 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)) { 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, seg, 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, seg, 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 int open_input(HLSContext *c, struct playlist *pls, struct segment *seg) { AVDictionary *opts = NULL; int ret; int is_http = 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); av_dict_set(&opts, "http_proxy", c->http_proxy, 0); av_dict_set(&opts, "seekable", "0", 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 = open_url(pls->parent, &pls->input, seg->url, c->avio_opts, opts, &is_http); } else if (seg->key_type == KEY_AES_128) { AVDictionary *opts2 = NULL; char iv[33], key[33], url[MAX_URL_SIZE]; if (strcmp(seg->key, pls->key_url)) { AVIOContext *pb; if (open_url(pls->parent, &pb, seg->key, c->avio_opts, opts, NULL) == 0) { ret = avio_read(pb, pls->key, sizeof(pls->key)); if (ret != sizeof(pls->key)) { av_log(NULL, AV_LOG_ERROR, "Unable to read key file %s\n", seg->key); } ff_format_io_close(pls->parent, &pb); } 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); av_dict_copy(&opts2, c->avio_opts, 0); av_dict_set(&opts2, "key", key, 0); av_dict_set(&opts2, "iv", iv, 0); ret = open_url(pls->parent, &pls->input, url, opts2, opts, &is_http); av_dict_free(&opts2); if (ret < 0) { 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. * * This is not done for HTTP at all as avio_seek() does internal bookkeeping * of file offset which is out-of-sync with the actual offset when "offset" * AVOption is used with http protocol, causing the seek to not be a no-op * as would be expected. Wrong offset received from the server will not be * noticed without the call, though. */ if (ret == 0 && !is_http && seg->key_type == KEY_NONE && seg->url_offset) { int64_t seekret = avio_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; ff_format_io_close(pls->parent, &pls->input); } } cleanup: av_dict_free(&opts); pls->cur_seg_offset = 0; return ret; } static int update_init_section(struct playlist *pls, struct segment *seg) { static const int max_init_section_size = 1024*1024; HLSContext *c = pls->parent->priv_data; int64_t sec_size; int64_t urlsize; int ret; if (seg->init_section == pls->cur_init_section) return 0; pls->cur_init_section = NULL; if (!seg->init_section) return 0; ret = open_input(c, pls, seg->init_section); if (ret < 0) { av_log(pls->parent, AV_LOG_WARNING, "Failed to open an initialization section in playlist %d\n", pls->index); return ret; } if (seg->init_section->size >= 0) sec_size = seg->init_section->size; else if ((urlsize = avio_size(pls->input)) >= 0) sec_size = urlsize; else sec_size = max_init_section_size; av_log(pls->parent, AV_LOG_DEBUG, "Downloading an initialization section of size %"PRId64"\n", sec_size); sec_size = FFMIN(sec_size, max_init_section_size); av_fast_malloc(&pls->init_sec_buf, &pls->init_sec_buf_size, sec_size); ret = read_from_url(pls, seg->init_section, pls->init_sec_buf, pls->init_sec_buf_size, READ_COMPLETE); ff_format_io_close(pls->parent, &pls->input); if (ret < 0) return ret; pls->cur_init_section = seg->init_section; pls->init_sec_data_len = ret; pls->init_sec_buf_read_offset = 0; /* spec says audio elementary streams do not have media initialization * sections, so there should be no ID3 timestamps */ pls->is_id3_timestamped = 0; return 0; } 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; struct segment *seg; /* Check that the playlist is still needed before opening a new * segment. */ if (v->ctx && v->ctx->nb_streams) { v->needed = 0; for (i = 0; i < v->n_main_streams; i++) { if (v->main_streams[i]->discard < AVDISCARD_ALL) { v->needed = 1; break; } } } 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; } seg = current_segment(v); /* load/update Media Initialization Section, if any */ ret = update_init_section(v, seg); if (ret) return ret; ret = open_input(c, v, seg); if (ret < 0) { if (ff_check_interrupt(c->interrupt_callback)) return AVERROR_EXIT; av_log(v->parent, AV_LOG_WARNING, "Failed to open segment of playlist %d\n", v->index); v->cur_seq_no += 1; goto reload; } just_opened = 1; } if (v->init_sec_buf_read_offset < v->init_sec_data_len) { /* Push init section out first before first actual segment */ int copy_size = FFMIN(v->init_sec_data_len - v->init_sec_buf_read_offset, buf_size); memcpy(buf, v->init_sec_buf, copy_size); v->init_sec_buf_read_offset += copy_size; return copy_size; } ret = read_from_url(v, current_segment(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; } ff_format_io_close(v->parent, &v->input); 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->n_main_streams; i++) { AVStream *st = pls->main_streams[i]; if (st->codecpar->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, start live_start_index segments from the * start or end */ if (c->live_start_index < 0) return pls->start_seq_no + FFMAX(pls->n_segments + c->live_start_index, 0); else return pls->start_seq_no + FFMIN(c->live_start_index, pls->n_segments - 1); } /* Otherwise just start on the first segment. */ return pls->start_seq_no; } static int save_avio_options(AVFormatContext *s) { HLSContext *c = s->priv_data; static const char *opts[] = { "headers", "http_proxy", "user_agent", "user-agent", "cookies", NULL }; const char **opt = opts; uint8_t *buf; int ret = 0; while (*opt) { if (av_opt_get(s->pb, *opt, AV_OPT_SEARCH_CHILDREN | AV_OPT_ALLOW_NULL, &buf) >= 0) { ret = av_dict_set(&c->avio_opts, *opt, buf, AV_DICT_DONT_STRDUP_VAL); if (ret < 0) return ret; } opt++; } return ret; } static int nested_io_open(AVFormatContext *s, AVIOContext **pb, const char *url, int flags, AVDictionary **opts) { av_log(s, AV_LOG_ERROR, "A HLS playlist item '%s' referred to an external file '%s'. " "Opening this file was forbidden for security reasons\n", s->filename, url); return AVERROR(EPERM); } static int hls_read_header(AVFormatContext *s) { void *u = (s->flags & AVFMT_FLAG_CUSTOM_IO) ? NULL : s->pb; HLSContext *c = s->priv_data; int ret = 0, i, j; int highest_cur_seq_no = 0; c->ctx = s; c->interrupt_callback = &s->interrupt_callback; c->strict_std_compliance = s->strict_std_compliance; c->first_packet = 1; c->first_timestamp = AV_NOPTS_VALUE; c->cur_timestamp = AV_NOPTS_VALUE; if (u) { // get the previous user agent & set back to null if string size is zero update_options(&c->user_agent, "user-agent", u); // get the previous cookies & set back to null if string size is zero update_options(&c->cookies, "cookies", u); // get the previous headers & set back to null if string size is zero update_options(&c->headers, "headers", u); // get the previous http proxt & set back to null if string size is zero update_options(&c->http_proxy, "http_proxy", u); } if ((ret = parse_playlist(c, s->filename, NULL, s->pb)) < 0) goto fail; if ((ret = save_avio_options(s)) < 0) goto fail; /* Some HLS servers don't like being sent the range header */ av_dict_set(&c->avio_opts, "seekable", "0", 0); 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); } /* Select the starting segments */ for (i = 0; i < c->n_playlists; i++) { struct playlist *pls = c->playlists[i]; if (pls->n_segments == 0) continue; pls->cur_seq_no = select_cur_seq_no(c, pls); highest_cur_seq_no = FFMAX(highest_cur_seq_no, pls->cur_seq_no); } /* 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; /* * If this is a live stream and this playlist looks like it is one segment * behind, try to sync it up so that every substream starts at the same * time position (so e.g. avformat_find_stream_info() will see packets from * all active streams within the first few seconds). This is not very generic, * though, as the sequence numbers are technically independent. */ if (!pls->finished && pls->cur_seq_no == highest_cur_seq_no - 1 && highest_cur_seq_no < pls->start_seq_no + pls->n_segments) { pls->cur_seq_no = highest_cur_seq_no; } pls->read_buffer = av_malloc(INITIAL_BUFFER_SIZE); if (!pls->read_buffer){ ret = AVERROR(ENOMEM); avformat_free_context(pls->ctx); pls->ctx = NULL; goto fail; } 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->ctx->io_open = nested_io_open; if ((ret = ff_copy_whiteblacklists(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_parameters_copy(st->codecpar, pls->ctx->streams[j]->codecpar); 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); dynarray_add(&pls->main_streams, &pls->n_main_streams, st); } 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); } /* 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->n_main_streams; k++) { struct AVStream *st = pls->main_streams[k]; av_program_add_stream_index(s, i, st->index); /* 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) ff_format_io_close(pls->parent, &pls->input); 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); c->first_packet = 0; 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_packet_unref(&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]; if (pls->pkt.stream_index >= pls->n_main_streams) { av_log(s, AV_LOG_ERROR, "stream index inconsistency: index %d, %d main streams, %d subdemuxer streams\n", pls->pkt.stream_index, pls->n_main_streams, pls->ctx->nb_streams); av_packet_unref(&pls->pkt); reset_packet(&pls->pkt); return AVERROR_BUG; } *pkt = pls->pkt; pkt->stream_index = pls->main_streams[pls->pkt.stream_index]->index; 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); av_dict_free(&c->avio_opts); 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; int j; int stream_subdemuxer_index; 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]; for (j = 0; j < pls->n_main_streams; j++) { if (pls->main_streams[j] == s->streams[stream_index]) { seek_pls = pls; stream_subdemuxer_index = j; 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_subdemuxer_index; for (i = 0; i < c->n_playlists; i++) { /* Reset reading */ struct playlist *pls = c->playlists[i]; if (pls->input) ff_format_io_close(pls->parent, &pls->input); av_packet_unref(&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; } #define OFFSET(x) offsetof(HLSContext, x) #define FLAGS AV_OPT_FLAG_DECODING_PARAM static const AVOption hls_options[] = { {"live_start_index", "segment index to start live streams at (negative values are from the end)", OFFSET(live_start_index), AV_OPT_TYPE_INT, {.i64 = -3}, INT_MIN, INT_MAX, FLAGS}, {NULL} }; static const AVClass hls_class = { .class_name = "hls,applehttp", .item_name = av_default_item_name, .option = hls_options, .version = LIBAVUTIL_VERSION_INT, }; AVInputFormat ff_hls_demuxer = { .name = "hls,applehttp", .long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"), .priv_class = &hls_class, .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, };