| /* |
| * Apple HTTP Live Streaming demuxer |
| * Copyright (c) 2010 Martin Storsjo |
| * |
| * 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/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" |
| |
| #define INITIAL_BUFFER_SIZE 32768 |
| |
| /* |
| * 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, |
| }; |
| |
| struct segment { |
| int64_t duration; |
| char url[MAX_URL_SIZE]; |
| char key[MAX_URL_SIZE]; |
| enum KeyType key_type; |
| uint8_t iv[16]; |
| }; |
| |
| /* |
| * 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; |
| int64_t target_duration; |
| int start_seq_no; |
| int n_segments; |
| struct segment **segments; |
| int needed, cur_needed; |
| int cur_seq_no; |
| int64_t last_load_time; |
| |
| char key_url[MAX_URL_SIZE]; |
| uint8_t key[16]; |
| }; |
| |
| struct variant { |
| int bandwidth; |
| int n_playlists; |
| struct playlist **playlists; |
| }; |
| |
| typedef struct HLSContext { |
| int n_variants; |
| struct variant **variants; |
| int n_playlists; |
| struct playlist **playlists; |
| |
| int cur_seq_no; |
| int end_of_segment; |
| int first_packet; |
| int64_t first_timestamp; |
| int64_t seek_timestamp; |
| int seek_flags; |
| 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_free(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_free_packet(&pls->pkt); |
| av_free(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; |
| } |
| |
| /* |
| * 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); |
| dynarray_add(&c->playlists, &c->n_playlists, pls); |
| return pls; |
| } |
| |
| static struct variant *new_variant(HLSContext *c, int bandwidth, |
| 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; |
| |
| var->bandwidth = bandwidth; |
| dynarray_add(&c->variants, &c->n_variants, var); |
| dynarray_add(&var->playlists, &var->n_playlists, pls); |
| return var; |
| } |
| |
| struct variant_info { |
| char bandwidth[20]; |
| }; |
| |
| 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); |
| } |
| } |
| |
| struct key_info { |
| char uri[MAX_URL_SIZE]; |
| char method[10]; |
| 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); |
| } |
| } |
| |
| static int parse_playlist(HLSContext *c, const char *url, |
| struct playlist *pls, AVIOContext *in) |
| { |
| int ret = 0, is_segment = 0, is_variant = 0, bandwidth = 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; |
| uint8_t *new_url = NULL; |
| |
| 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; |
| } |
| while (!url_feof(in)) { |
| read_chomp_line(in, line, sizeof(line)); |
| if (av_strstart(line, "#EXT-X-STREAM-INF:", &ptr)) { |
| struct variant_info info = {{0}}; |
| is_variant = 1; |
| ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_variant_args, |
| &info); |
| bandwidth = atoi(info.bandwidth); |
| } 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 (!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-TARGETDURATION:", &ptr)) { |
| if (!pls) { |
| if (!new_variant(c, 0, url, NULL)) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| pls = c->playlists[c->n_playlists - 1]; |
| } |
| pls->target_duration = atoi(ptr) * AV_TIME_BASE; |
| } else if (av_strstart(line, "#EXT-X-MEDIA-SEQUENCE:", &ptr)) { |
| if (!pls) { |
| if (!new_variant(c, 0, url, NULL)) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| pls = c->playlists[c->n_playlists - 1]; |
| } |
| pls->start_seq_no = atoi(ptr); |
| } 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, "#", NULL)) { |
| continue; |
| } else if (line[0]) { |
| if (is_variant) { |
| if (!new_variant(c, bandwidth, line, url)) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| is_variant = 0; |
| bandwidth = 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); |
| } |
| ff_make_absolute_url(seg->key, sizeof(seg->key), url, key); |
| ff_make_absolute_url(seg->url, sizeof(seg->url), url, line); |
| dynarray_add(&pls->segments, &pls->n_segments, seg); |
| is_segment = 0; |
| } |
| } |
| } |
| if (pls) |
| pls->last_load_time = av_gettime(); |
| |
| fail: |
| av_free(new_url); |
| if (close_in) |
| avio_close(in); |
| return ret; |
| } |
| |
| 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->key_type == KEY_NONE) { |
| ret = ffurl_open(&pls->input, seg->url, AVIO_FLAG_READ, |
| &pls->parent->interrupt_callback, &opts); |
| goto cleanup; |
| } 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); |
| } |
| 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 |
| ret = AVERROR(ENOSYS); |
| |
| cleanup: |
| av_dict_free(&opts); |
| av_dict_free(&opts2); |
| return ret; |
| } |
| |
| 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; |
| |
| restart: |
| if (!v->input) { |
| /* If this is a live stream and the reload interval has elapsed since |
| * the last playlist reload, reload the playlists now. */ |
| int64_t reload_interval = v->n_segments > 0 ? |
| v->segments[v->n_segments - 1]->duration : |
| v->target_duration; |
| |
| reload: |
| if (!v->finished && |
| av_gettime() - v->last_load_time >= reload_interval) { |
| if ((ret = parse_playlist(c, v->url, v, NULL)) < 0) |
| 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() - 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) |
| return ret; |
| } |
| ret = ffurl_read(v->input, buf, buf_size); |
| if (ret > 0) |
| return ret; |
| ffurl_close(v->input); |
| v->input = NULL; |
| v->cur_seq_no++; |
| |
| c->end_of_segment = 1; |
| c->cur_seq_no = v->cur_seq_no; |
| |
| 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; |
| } |
| 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 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; |
| |
| // 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 |
| av_freep(&c->user_agent); |
| av_opt_get(u->priv_data, "user-agent", 0, (uint8_t**)&(c->user_agent)); |
| if (c->user_agent && !strlen(c->user_agent)) |
| av_freep(&c->user_agent); |
| |
| // get the previous cookies & set back to null if string size is zero |
| av_freep(&c->cookies); |
| av_opt_get(u->priv_data, "cookies", 0, (uint8_t**)&(c->cookies)); |
| if (c->cookies && !strlen(c->cookies)) |
| av_freep(&c->cookies); |
| |
| // get the previous headers & set back to null if string size is zero |
| av_freep(&c->headers); |
| av_opt_get(u->priv_data, "headers", 0, (uint8_t**)&(c->headers)); |
| if (c->headers && !strlen(c->headers)) |
| av_freep(&c->headers); |
| } |
| |
| 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; |
| } |
| |
| /* 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->n_segments == 0) |
| continue; |
| |
| if (!(pls->ctx = avformat_alloc_context())) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| |
| pls->index = i; |
| pls->needed = 1; |
| pls->parent = s; |
| |
| /* If this is a live stream with more than 3 segments, start at the |
| * third last segment. */ |
| pls->cur_seq_no = pls->start_seq_no; |
| if (!pls->finished && pls->n_segments > 3) |
| pls->cur_seq_no = pls->start_seq_no + pls->n_segments - 3; |
| |
| 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; |
| ret = avformat_open_input(&pls->ctx, pls->segments[0]->url, in_fmt, NULL); |
| if (ret < 0) |
| goto fail; |
| |
| pls->ctx->ctx_flags &= ~AVFMTCTX_NOHEADER; |
| ret = avformat_find_stream_info(pls->ctx, NULL); |
| if (ret < 0) |
| goto fail; |
| |
| /* 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; |
| avpriv_set_pts_info(st, ist->pts_wrap_bits, ist->time_base.num, ist->time_base.den); |
| avcodec_copy_context(st->codec, pls->ctx->streams[j]->codec); |
| } |
| |
| 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]; |
| char bitrate_str[20]; |
| AVProgram *program; |
| |
| snprintf(bitrate_str, sizeof(bitrate_str), "%d", v->bandwidth); |
| |
| program = av_new_program(s, i); |
| if (!program) |
| goto fail; |
| av_dict_set(&program->metadata, "variant_bitrate", bitrate_str, 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(&st->metadata, "variant_bitrate", bitrate_str, 0); |
| } |
| } |
| } |
| |
| c->first_packet = 1; |
| c->first_timestamp = AV_NOPTS_VALUE; |
| c->seek_timestamp = AV_NOPTS_VALUE; |
| |
| return 0; |
| fail: |
| free_playlist_list(c); |
| free_variant_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 = c->cur_seq_no; |
| pls->pb.eof_reached = 0; |
| av_log(s, AV_LOG_INFO, "Now receiving playlist %d\n", i); |
| } 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 int hls_read_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| HLSContext *c = s->priv_data; |
| int ret, i, minplaylist = -1; |
| |
| if (c->first_packet) { |
| recheck_discard_flags(s, 1); |
| c->first_packet = 0; |
| } |
| |
| start: |
| c->end_of_segment = 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; |
| AVStream *st; |
| ret = av_read_frame(pls->ctx, &pls->pkt); |
| if (ret < 0) { |
| if (!url_feof(&pls->pb) && ret != AVERROR_EOF) |
| return ret; |
| reset_packet(&pls->pkt); |
| break; |
| } else { |
| if (c->first_timestamp == AV_NOPTS_VALUE && |
| pls->pkt.dts != AV_NOPTS_VALUE) |
| c->first_timestamp = av_rescale_q(pls->pkt.dts, |
| pls->ctx->streams[pls->pkt.stream_index]->time_base, |
| AV_TIME_BASE_Q); |
| } |
| |
| if (c->seek_timestamp == AV_NOPTS_VALUE) |
| break; |
| |
| if (pls->pkt.dts == AV_NOPTS_VALUE) { |
| c->seek_timestamp = AV_NOPTS_VALUE; |
| break; |
| } |
| |
| st = pls->ctx->streams[pls->pkt.stream_index]; |
| ts_diff = av_rescale_rnd(pls->pkt.dts, AV_TIME_BASE, |
| st->time_base.den, AV_ROUND_DOWN) - |
| c->seek_timestamp; |
| if (ts_diff >= 0 && (c->seek_flags & AVSEEK_FLAG_ANY || |
| pls->pkt.flags & AV_PKT_FLAG_KEY)) { |
| c->seek_timestamp = AV_NOPTS_VALUE; |
| break; |
| } |
| av_free_packet(&pls->pkt); |
| reset_packet(&pls->pkt); |
| } |
| } |
| /* Check if this stream still is on an earlier segment number, or |
| * has the packet with the lowest dts */ |
| if (pls->pkt.data) { |
| struct playlist *minpls = minplaylist < 0 ? |
| NULL : c->playlists[minplaylist]; |
| if (minplaylist < 0 || pls->cur_seq_no < minpls->cur_seq_no) { |
| minplaylist = i; |
| } else if (pls->cur_seq_no == minpls->cur_seq_no) { |
| int64_t dts = pls->pkt.dts; |
| int64_t mindts = minpls->pkt.dts; |
| AVStream *st = pls->ctx->streams[pls->pkt.stream_index]; |
| AVStream *minst = minpls->ctx->streams[minpls->pkt.stream_index]; |
| |
| if (dts == AV_NOPTS_VALUE) { |
| minplaylist = i; |
| } else if (mindts != AV_NOPTS_VALUE) { |
| if (st->start_time != AV_NOPTS_VALUE) |
| dts -= st->start_time; |
| if (minst->start_time != AV_NOPTS_VALUE) |
| mindts -= minst->start_time; |
| |
| if (av_compare_ts(dts, st->time_base, |
| mindts, minst->time_base) < 0) |
| minplaylist = i; |
| } |
| } |
| } |
| } |
| if (c->end_of_segment) { |
| if (recheck_discard_flags(s, 0)) |
| goto start; |
| } |
| /* If we got a packet, return it */ |
| if (minplaylist >= 0) { |
| *pkt = c->playlists[minplaylist]->pkt; |
| pkt->stream_index += c->playlists[minplaylist]->stream_offset; |
| reset_packet(&c->playlists[minplaylist]->pkt); |
| return 0; |
| } |
| return AVERROR_EOF; |
| } |
| |
| static int hls_close(AVFormatContext *s) |
| { |
| HLSContext *c = s->priv_data; |
| |
| free_playlist_list(c); |
| free_variant_list(c); |
| return 0; |
| } |
| |
| static int hls_read_seek(AVFormatContext *s, int stream_index, |
| int64_t timestamp, int flags) |
| { |
| HLSContext *c = s->priv_data; |
| int i, j, ret; |
| |
| if ((flags & AVSEEK_FLAG_BYTE) || !c->variants[0]->playlists[0]->finished) |
| return AVERROR(ENOSYS); |
| |
| c->seek_flags = flags; |
| c->seek_timestamp = stream_index < 0 ? 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); |
| timestamp = av_rescale_rnd(timestamp, AV_TIME_BASE, stream_index >= 0 ? |
| s->streams[stream_index]->time_base.den : |
| AV_TIME_BASE, flags & AVSEEK_FLAG_BACKWARD ? |
| AV_ROUND_DOWN : AV_ROUND_UP); |
| if (s->duration < c->seek_timestamp) { |
| c->seek_timestamp = AV_NOPTS_VALUE; |
| return AVERROR(EIO); |
| } |
| |
| ret = AVERROR(EIO); |
| for (i = 0; i < c->n_playlists; i++) { |
| /* Reset reading */ |
| struct playlist *pls = c->playlists[i]; |
| int64_t pos = c->first_timestamp == AV_NOPTS_VALUE ? |
| 0 : c->first_timestamp; |
| 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; |
| |
| /* Locate the segment that contains the target timestamp */ |
| for (j = 0; j < pls->n_segments; j++) { |
| if (timestamp >= pos && |
| timestamp < pos + pls->segments[j]->duration) { |
| pls->cur_seq_no = pls->start_seq_no + j; |
| ret = 0; |
| break; |
| } |
| pos += pls->segments[j]->duration; |
| } |
| if (ret) |
| c->seek_timestamp = AV_NOPTS_VALUE; |
| } |
| return ret; |
| } |
| |
| 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, |
| }; |