yading@11: /* yading@11: * Apple HTTP Live Streaming demuxer yading@11: * Copyright (c) 2010 Martin Storsjo yading@11: * yading@11: * This file is part of FFmpeg. yading@11: * yading@11: * FFmpeg is free software; you can redistribute it and/or yading@11: * modify it under the terms of the GNU Lesser General Public yading@11: * License as published by the Free Software Foundation; either yading@11: * version 2.1 of the License, or (at your option) any later version. yading@11: * yading@11: * FFmpeg is distributed in the hope that it will be useful, yading@11: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@11: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@11: * Lesser General Public License for more details. yading@11: * yading@11: * You should have received a copy of the GNU Lesser General Public yading@11: * License along with FFmpeg; if not, write to the Free Software yading@11: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@11: */ yading@11: yading@11: /** yading@11: * @file yading@11: * Apple HTTP Live Streaming demuxer yading@11: * http://tools.ietf.org/html/draft-pantos-http-live-streaming yading@11: */ yading@11: yading@11: #include "libavutil/avstring.h" yading@11: #include "libavutil/intreadwrite.h" yading@11: #include "libavutil/mathematics.h" yading@11: #include "libavutil/opt.h" yading@11: #include "libavutil/dict.h" yading@11: #include "libavutil/time.h" yading@11: #include "avformat.h" yading@11: #include "internal.h" yading@11: #include "avio_internal.h" yading@11: #include "url.h" yading@11: yading@11: #define INITIAL_BUFFER_SIZE 32768 yading@11: yading@11: /* yading@11: * An apple http stream consists of a playlist with media segment files, yading@11: * played sequentially. There may be several playlists with the same yading@11: * video content, in different bandwidth variants, that are played in yading@11: * parallel (preferably only one bandwidth variant at a time). In this case, yading@11: * the user supplied the url to a main playlist that only lists the variant yading@11: * playlists. yading@11: * yading@11: * If the main playlist doesn't point at any variants, we still create yading@11: * one anonymous toplevel variant for this, to maintain the structure. yading@11: */ yading@11: yading@11: enum KeyType { yading@11: KEY_NONE, yading@11: KEY_AES_128, yading@11: }; yading@11: yading@11: struct segment { yading@11: int duration; yading@11: char url[MAX_URL_SIZE]; yading@11: char key[MAX_URL_SIZE]; yading@11: enum KeyType key_type; yading@11: uint8_t iv[16]; yading@11: }; yading@11: yading@11: /* yading@11: * Each variant has its own demuxer. If it currently is active, yading@11: * it has an open AVIOContext too, and potentially an AVPacket yading@11: * containing the next packet from this stream. yading@11: */ yading@11: struct variant { yading@11: int bandwidth; yading@11: char url[MAX_URL_SIZE]; yading@11: AVIOContext pb; yading@11: uint8_t* read_buffer; yading@11: URLContext *input; yading@11: AVFormatContext *parent; yading@11: int index; yading@11: AVFormatContext *ctx; yading@11: AVPacket pkt; yading@11: int stream_offset; yading@11: yading@11: int finished; yading@11: int target_duration; yading@11: int start_seq_no; yading@11: int n_segments; yading@11: struct segment **segments; yading@11: int needed, cur_needed; yading@11: int cur_seq_no; yading@11: int64_t last_load_time; yading@11: yading@11: char key_url[MAX_URL_SIZE]; yading@11: uint8_t key[16]; yading@11: }; yading@11: yading@11: typedef struct HLSContext { yading@11: int n_variants; yading@11: struct variant **variants; yading@11: int cur_seq_no; yading@11: int end_of_segment; yading@11: int first_packet; yading@11: int64_t first_timestamp; yading@11: int64_t seek_timestamp; yading@11: int seek_flags; yading@11: AVIOInterruptCB *interrupt_callback; yading@11: char *user_agent; ///< holds HTTP user agent set as an AVOption to the HTTP protocol context yading@11: char *cookies; ///< holds HTTP cookie values set in either the initial response or as an AVOption to the HTTP protocol context yading@11: } HLSContext; yading@11: yading@11: static int read_chomp_line(AVIOContext *s, char *buf, int maxlen) yading@11: { yading@11: int len = ff_get_line(s, buf, maxlen); yading@11: while (len > 0 && av_isspace(buf[len - 1])) yading@11: buf[--len] = '\0'; yading@11: return len; yading@11: } yading@11: yading@11: static void free_segment_list(struct variant *var) yading@11: { yading@11: int i; yading@11: for (i = 0; i < var->n_segments; i++) yading@11: av_free(var->segments[i]); yading@11: av_freep(&var->segments); yading@11: var->n_segments = 0; yading@11: } yading@11: yading@11: static void free_variant_list(HLSContext *c) yading@11: { yading@11: int i; yading@11: for (i = 0; i < c->n_variants; i++) { yading@11: struct variant *var = c->variants[i]; yading@11: free_segment_list(var); yading@11: av_free_packet(&var->pkt); yading@11: av_free(var->pb.buffer); yading@11: if (var->input) yading@11: ffurl_close(var->input); yading@11: if (var->ctx) { yading@11: var->ctx->pb = NULL; yading@11: avformat_close_input(&var->ctx); yading@11: } yading@11: av_free(var); yading@11: } yading@11: av_freep(&c->variants); yading@11: av_freep(&c->cookies); yading@11: av_freep(&c->user_agent); yading@11: c->n_variants = 0; yading@11: } yading@11: yading@11: /* yading@11: * Used to reset a statically allocated AVPacket to a clean slate, yading@11: * containing no data. yading@11: */ yading@11: static void reset_packet(AVPacket *pkt) yading@11: { yading@11: av_init_packet(pkt); yading@11: pkt->data = NULL; yading@11: } yading@11: yading@11: static struct variant *new_variant(HLSContext *c, int bandwidth, yading@11: const char *url, const char *base) yading@11: { yading@11: struct variant *var = av_mallocz(sizeof(struct variant)); yading@11: if (!var) yading@11: return NULL; yading@11: reset_packet(&var->pkt); yading@11: var->bandwidth = bandwidth; yading@11: ff_make_absolute_url(var->url, sizeof(var->url), base, url); yading@11: dynarray_add(&c->variants, &c->n_variants, var); yading@11: return var; yading@11: } yading@11: yading@11: struct variant_info { yading@11: char bandwidth[20]; yading@11: }; yading@11: yading@11: static void handle_variant_args(struct variant_info *info, const char *key, yading@11: int key_len, char **dest, int *dest_len) yading@11: { yading@11: if (!strncmp(key, "BANDWIDTH=", key_len)) { yading@11: *dest = info->bandwidth; yading@11: *dest_len = sizeof(info->bandwidth); yading@11: } yading@11: } yading@11: yading@11: struct key_info { yading@11: char uri[MAX_URL_SIZE]; yading@11: char method[10]; yading@11: char iv[35]; yading@11: }; yading@11: yading@11: static void handle_key_args(struct key_info *info, const char *key, yading@11: int key_len, char **dest, int *dest_len) yading@11: { yading@11: if (!strncmp(key, "METHOD=", key_len)) { yading@11: *dest = info->method; yading@11: *dest_len = sizeof(info->method); yading@11: } else if (!strncmp(key, "URI=", key_len)) { yading@11: *dest = info->uri; yading@11: *dest_len = sizeof(info->uri); yading@11: } else if (!strncmp(key, "IV=", key_len)) { yading@11: *dest = info->iv; yading@11: *dest_len = sizeof(info->iv); yading@11: } yading@11: } yading@11: yading@11: static int parse_playlist(HLSContext *c, const char *url, yading@11: struct variant *var, AVIOContext *in) yading@11: { yading@11: int ret = 0, duration = 0, is_segment = 0, is_variant = 0, bandwidth = 0; yading@11: enum KeyType key_type = KEY_NONE; yading@11: uint8_t iv[16] = ""; yading@11: int has_iv = 0; yading@11: char key[MAX_URL_SIZE] = ""; yading@11: char line[1024]; yading@11: const char *ptr; yading@11: int close_in = 0; yading@11: yading@11: if (!in) { yading@11: AVDictionary *opts = NULL; yading@11: close_in = 1; yading@11: /* Some HLS servers dont like being sent the range header */ yading@11: av_dict_set(&opts, "seekable", "0", 0); yading@11: yading@11: // broker prior HTTP options that should be consistent across requests yading@11: av_dict_set(&opts, "user-agent", c->user_agent, 0); yading@11: av_dict_set(&opts, "cookies", c->cookies, 0); yading@11: yading@11: ret = avio_open2(&in, url, AVIO_FLAG_READ, yading@11: c->interrupt_callback, &opts); yading@11: av_dict_free(&opts); yading@11: if (ret < 0) yading@11: return ret; yading@11: } yading@11: yading@11: read_chomp_line(in, line, sizeof(line)); yading@11: if (strcmp(line, "#EXTM3U")) { yading@11: ret = AVERROR_INVALIDDATA; yading@11: goto fail; yading@11: } yading@11: yading@11: if (var) { yading@11: free_segment_list(var); yading@11: var->finished = 0; yading@11: } yading@11: while (!url_feof(in)) { yading@11: read_chomp_line(in, line, sizeof(line)); yading@11: if (av_strstart(line, "#EXT-X-STREAM-INF:", &ptr)) { yading@11: struct variant_info info = {{0}}; yading@11: is_variant = 1; yading@11: ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_variant_args, yading@11: &info); yading@11: bandwidth = atoi(info.bandwidth); yading@11: } else if (av_strstart(line, "#EXT-X-KEY:", &ptr)) { yading@11: struct key_info info = {{0}}; yading@11: ff_parse_key_value(ptr, (ff_parse_key_val_cb) handle_key_args, yading@11: &info); yading@11: key_type = KEY_NONE; yading@11: has_iv = 0; yading@11: if (!strcmp(info.method, "AES-128")) yading@11: key_type = KEY_AES_128; yading@11: if (!strncmp(info.iv, "0x", 2) || !strncmp(info.iv, "0X", 2)) { yading@11: ff_hex_to_data(iv, info.iv + 2); yading@11: has_iv = 1; yading@11: } yading@11: av_strlcpy(key, info.uri, sizeof(key)); yading@11: } else if (av_strstart(line, "#EXT-X-TARGETDURATION:", &ptr)) { yading@11: if (!var) { yading@11: var = new_variant(c, 0, url, NULL); yading@11: if (!var) { yading@11: ret = AVERROR(ENOMEM); yading@11: goto fail; yading@11: } yading@11: } yading@11: var->target_duration = atoi(ptr); yading@11: } else if (av_strstart(line, "#EXT-X-MEDIA-SEQUENCE:", &ptr)) { yading@11: if (!var) { yading@11: var = new_variant(c, 0, url, NULL); yading@11: if (!var) { yading@11: ret = AVERROR(ENOMEM); yading@11: goto fail; yading@11: } yading@11: } yading@11: var->start_seq_no = atoi(ptr); yading@11: } else if (av_strstart(line, "#EXT-X-ENDLIST", &ptr)) { yading@11: if (var) yading@11: var->finished = 1; yading@11: } else if (av_strstart(line, "#EXTINF:", &ptr)) { yading@11: is_segment = 1; yading@11: duration = atoi(ptr); yading@11: } else if (av_strstart(line, "#", NULL)) { yading@11: continue; yading@11: } else if (line[0]) { yading@11: if (is_variant) { yading@11: if (!new_variant(c, bandwidth, line, url)) { yading@11: ret = AVERROR(ENOMEM); yading@11: goto fail; yading@11: } yading@11: is_variant = 0; yading@11: bandwidth = 0; yading@11: } yading@11: if (is_segment) { yading@11: struct segment *seg; yading@11: if (!var) { yading@11: var = new_variant(c, 0, url, NULL); yading@11: if (!var) { yading@11: ret = AVERROR(ENOMEM); yading@11: goto fail; yading@11: } yading@11: } yading@11: seg = av_malloc(sizeof(struct segment)); yading@11: if (!seg) { yading@11: ret = AVERROR(ENOMEM); yading@11: goto fail; yading@11: } yading@11: seg->duration = duration; yading@11: seg->key_type = key_type; yading@11: if (has_iv) { yading@11: memcpy(seg->iv, iv, sizeof(iv)); yading@11: } else { yading@11: int seq = var->start_seq_no + var->n_segments; yading@11: memset(seg->iv, 0, sizeof(seg->iv)); yading@11: AV_WB32(seg->iv + 12, seq); yading@11: } yading@11: ff_make_absolute_url(seg->key, sizeof(seg->key), url, key); yading@11: ff_make_absolute_url(seg->url, sizeof(seg->url), url, line); yading@11: dynarray_add(&var->segments, &var->n_segments, seg); yading@11: is_segment = 0; yading@11: } yading@11: } yading@11: } yading@11: if (var) yading@11: var->last_load_time = av_gettime(); yading@11: yading@11: fail: yading@11: if (close_in) yading@11: avio_close(in); yading@11: return ret; yading@11: } yading@11: yading@11: static int open_input(HLSContext *c, struct variant *var) yading@11: { yading@11: AVDictionary *opts = NULL; yading@11: int ret; yading@11: struct segment *seg = var->segments[var->cur_seq_no - var->start_seq_no]; yading@11: yading@11: // broker prior HTTP options that should be consistent across requests yading@11: av_dict_set(&opts, "user-agent", c->user_agent, 0); yading@11: av_dict_set(&opts, "cookies", c->cookies, 0); yading@11: av_dict_set(&opts, "seekable", "0", 0); yading@11: yading@11: if (seg->key_type == KEY_NONE) { yading@11: ret = ffurl_open(&var->input, seg->url, AVIO_FLAG_READ, yading@11: &var->parent->interrupt_callback, &opts); yading@11: goto cleanup; yading@11: } else if (seg->key_type == KEY_AES_128) { yading@11: char iv[33], key[33], url[MAX_URL_SIZE]; yading@11: if (strcmp(seg->key, var->key_url)) { yading@11: URLContext *uc; yading@11: if (ffurl_open(&uc, seg->key, AVIO_FLAG_READ, yading@11: &var->parent->interrupt_callback, &opts) == 0) { yading@11: if (ffurl_read_complete(uc, var->key, sizeof(var->key)) yading@11: != sizeof(var->key)) { yading@11: av_log(NULL, AV_LOG_ERROR, "Unable to read key file %s\n", yading@11: seg->key); yading@11: } yading@11: ffurl_close(uc); yading@11: } else { yading@11: av_log(NULL, AV_LOG_ERROR, "Unable to open key file %s\n", yading@11: seg->key); yading@11: } yading@11: av_strlcpy(var->key_url, seg->key, sizeof(var->key_url)); yading@11: } yading@11: ff_data_to_hex(iv, seg->iv, sizeof(seg->iv), 0); yading@11: ff_data_to_hex(key, var->key, sizeof(var->key), 0); yading@11: iv[32] = key[32] = '\0'; yading@11: if (strstr(seg->url, "://")) yading@11: snprintf(url, sizeof(url), "crypto+%s", seg->url); yading@11: else yading@11: snprintf(url, sizeof(url), "crypto:%s", seg->url); yading@11: if ((ret = ffurl_alloc(&var->input, url, AVIO_FLAG_READ, yading@11: &var->parent->interrupt_callback)) < 0) yading@11: goto cleanup; yading@11: av_opt_set(var->input->priv_data, "key", key, 0); yading@11: av_opt_set(var->input->priv_data, "iv", iv, 0); yading@11: /* Need to repopulate options */ yading@11: av_dict_free(&opts); yading@11: av_dict_set(&opts, "seekable", "0", 0); yading@11: if ((ret = ffurl_connect(var->input, &opts)) < 0) { yading@11: ffurl_close(var->input); yading@11: var->input = NULL; yading@11: goto cleanup; yading@11: } yading@11: ret = 0; yading@11: } yading@11: else yading@11: ret = AVERROR(ENOSYS); yading@11: yading@11: cleanup: yading@11: av_dict_free(&opts); yading@11: return ret; yading@11: } yading@11: yading@11: static int read_data(void *opaque, uint8_t *buf, int buf_size) yading@11: { yading@11: struct variant *v = opaque; yading@11: HLSContext *c = v->parent->priv_data; yading@11: int ret, i; yading@11: yading@11: restart: yading@11: if (!v->input) { yading@11: /* If this is a live stream and the reload interval has elapsed since yading@11: * the last playlist reload, reload the variant playlists now. */ yading@11: int64_t reload_interval = v->n_segments > 0 ? yading@11: v->segments[v->n_segments - 1]->duration : yading@11: v->target_duration; yading@11: reload_interval *= 1000000; yading@11: yading@11: reload: yading@11: if (!v->finished && yading@11: av_gettime() - v->last_load_time >= reload_interval) { yading@11: if ((ret = parse_playlist(c, v->url, v, NULL)) < 0) yading@11: return ret; yading@11: /* If we need to reload the playlist again below (if yading@11: * there's still no more segments), switch to a reload yading@11: * interval of half the target duration. */ yading@11: reload_interval = v->target_duration * 500000LL; yading@11: } yading@11: if (v->cur_seq_no < v->start_seq_no) { yading@11: av_log(NULL, AV_LOG_WARNING, yading@11: "skipping %d segments ahead, expired from playlists\n", yading@11: v->start_seq_no - v->cur_seq_no); yading@11: v->cur_seq_no = v->start_seq_no; yading@11: } yading@11: if (v->cur_seq_no >= v->start_seq_no + v->n_segments) { yading@11: if (v->finished) yading@11: return AVERROR_EOF; yading@11: while (av_gettime() - v->last_load_time < reload_interval) { yading@11: if (ff_check_interrupt(c->interrupt_callback)) yading@11: return AVERROR_EXIT; yading@11: av_usleep(100*1000); yading@11: } yading@11: /* Enough time has elapsed since the last reload */ yading@11: goto reload; yading@11: } yading@11: yading@11: ret = open_input(c, v); yading@11: if (ret < 0) yading@11: return ret; yading@11: } yading@11: ret = ffurl_read(v->input, buf, buf_size); yading@11: if (ret > 0) yading@11: return ret; yading@11: ffurl_close(v->input); yading@11: v->input = NULL; yading@11: v->cur_seq_no++; yading@11: yading@11: c->end_of_segment = 1; yading@11: c->cur_seq_no = v->cur_seq_no; yading@11: yading@11: if (v->ctx && v->ctx->nb_streams && v->parent->nb_streams >= v->stream_offset + v->ctx->nb_streams) { yading@11: v->needed = 0; yading@11: for (i = v->stream_offset; i < v->stream_offset + v->ctx->nb_streams; yading@11: i++) { yading@11: if (v->parent->streams[i]->discard < AVDISCARD_ALL) yading@11: v->needed = 1; yading@11: } yading@11: } yading@11: if (!v->needed) { yading@11: av_log(v->parent, AV_LOG_INFO, "No longer receiving variant %d\n", yading@11: v->index); yading@11: return AVERROR_EOF; yading@11: } yading@11: goto restart; yading@11: } yading@11: yading@11: static int hls_read_header(AVFormatContext *s) yading@11: { yading@11: URLContext *u = (s->flags & AVFMT_FLAG_CUSTOM_IO) ? NULL : s->pb->opaque; yading@11: HLSContext *c = s->priv_data; yading@11: int ret = 0, i, j, stream_offset = 0; yading@11: yading@11: c->interrupt_callback = &s->interrupt_callback; yading@11: yading@11: // if the URL context is good, read important options we must broker later yading@11: if (u && u->prot->priv_data_class) { yading@11: // get the previous user agent & set back to null if string size is zero yading@11: av_freep(&c->user_agent); yading@11: av_opt_get(u->priv_data, "user-agent", 0, (uint8_t**)&(c->user_agent)); yading@11: if (c->user_agent && !strlen(c->user_agent)) yading@11: av_freep(&c->user_agent); yading@11: yading@11: // get the previous cookies & set back to null if string size is zero yading@11: av_freep(&c->cookies); yading@11: av_opt_get(u->priv_data, "cookies", 0, (uint8_t**)&(c->cookies)); yading@11: if (c->cookies && !strlen(c->cookies)) yading@11: av_freep(&c->cookies); yading@11: } yading@11: yading@11: if ((ret = parse_playlist(c, s->filename, NULL, s->pb)) < 0) yading@11: goto fail; yading@11: yading@11: if (c->n_variants == 0) { yading@11: av_log(NULL, AV_LOG_WARNING, "Empty playlist\n"); yading@11: ret = AVERROR_EOF; yading@11: goto fail; yading@11: } yading@11: /* If the playlist only contained variants, parse each individual yading@11: * variant playlist. */ yading@11: if (c->n_variants > 1 || c->variants[0]->n_segments == 0) { yading@11: for (i = 0; i < c->n_variants; i++) { yading@11: struct variant *v = c->variants[i]; yading@11: if ((ret = parse_playlist(c, v->url, v, NULL)) < 0) yading@11: goto fail; yading@11: } yading@11: } yading@11: yading@11: if (c->variants[0]->n_segments == 0) { yading@11: av_log(NULL, AV_LOG_WARNING, "Empty playlist\n"); yading@11: ret = AVERROR_EOF; yading@11: goto fail; yading@11: } yading@11: yading@11: /* If this isn't a live stream, calculate the total duration of the yading@11: * stream. */ yading@11: if (c->variants[0]->finished) { yading@11: int64_t duration = 0; yading@11: for (i = 0; i < c->variants[0]->n_segments; i++) yading@11: duration += c->variants[0]->segments[i]->duration; yading@11: s->duration = duration * AV_TIME_BASE; yading@11: } yading@11: yading@11: /* Open the demuxer for each variant */ yading@11: for (i = 0; i < c->n_variants; i++) { yading@11: struct variant *v = c->variants[i]; yading@11: AVInputFormat *in_fmt = NULL; yading@11: char bitrate_str[20]; yading@11: AVProgram *program = NULL; yading@11: if (v->n_segments == 0) yading@11: continue; yading@11: yading@11: if (!(v->ctx = avformat_alloc_context())) { yading@11: ret = AVERROR(ENOMEM); yading@11: goto fail; yading@11: } yading@11: yading@11: v->index = i; yading@11: v->needed = 1; yading@11: v->parent = s; yading@11: yading@11: /* If this is a live stream with more than 3 segments, start at the yading@11: * third last segment. */ yading@11: v->cur_seq_no = v->start_seq_no; yading@11: if (!v->finished && v->n_segments > 3) yading@11: v->cur_seq_no = v->start_seq_no + v->n_segments - 3; yading@11: yading@11: v->read_buffer = av_malloc(INITIAL_BUFFER_SIZE); yading@11: ffio_init_context(&v->pb, v->read_buffer, INITIAL_BUFFER_SIZE, 0, v, yading@11: read_data, NULL, NULL); yading@11: v->pb.seekable = 0; yading@11: ret = av_probe_input_buffer(&v->pb, &in_fmt, v->segments[0]->url, yading@11: NULL, 0, 0); yading@11: if (ret < 0) { yading@11: /* Free the ctx - it isn't initialized properly at this point, yading@11: * so avformat_close_input shouldn't be called. If yading@11: * avformat_open_input fails below, it frees and zeros the yading@11: * context, so it doesn't need any special treatment like this. */ yading@11: av_log(s, AV_LOG_ERROR, "Error when loading first segment '%s'\n", v->segments[0]->url); yading@11: avformat_free_context(v->ctx); yading@11: v->ctx = NULL; yading@11: goto fail; yading@11: } yading@11: v->ctx->pb = &v->pb; yading@11: ret = avformat_open_input(&v->ctx, v->segments[0]->url, in_fmt, NULL); yading@11: if (ret < 0) yading@11: goto fail; yading@11: yading@11: v->stream_offset = stream_offset; yading@11: v->ctx->ctx_flags &= ~AVFMTCTX_NOHEADER; yading@11: ret = avformat_find_stream_info(v->ctx, NULL); yading@11: if (ret < 0) yading@11: goto fail; yading@11: snprintf(bitrate_str, sizeof(bitrate_str), "%d", v->bandwidth); yading@11: yading@11: /* Create new AVprogram for variant i */ yading@11: program = av_new_program(s, i); yading@11: if (!program) yading@11: goto fail; yading@11: av_dict_set(&program->metadata, "variant_bitrate", bitrate_str, 0); yading@11: yading@11: /* Create new AVStreams for each stream in this variant */ yading@11: for (j = 0; j < v->ctx->nb_streams; j++) { yading@11: AVStream *st = avformat_new_stream(s, NULL); yading@11: AVStream *ist = v->ctx->streams[j]; yading@11: if (!st) { yading@11: ret = AVERROR(ENOMEM); yading@11: goto fail; yading@11: } yading@11: ff_program_add_stream_index(s, i, stream_offset + j); yading@11: st->id = i; yading@11: avpriv_set_pts_info(st, ist->pts_wrap_bits, ist->time_base.num, ist->time_base.den); yading@11: avcodec_copy_context(st->codec, v->ctx->streams[j]->codec); yading@11: if (v->bandwidth) yading@11: av_dict_set(&st->metadata, "variant_bitrate", bitrate_str, yading@11: 0); yading@11: } yading@11: stream_offset += v->ctx->nb_streams; yading@11: } yading@11: yading@11: c->first_packet = 1; yading@11: c->first_timestamp = AV_NOPTS_VALUE; yading@11: c->seek_timestamp = AV_NOPTS_VALUE; yading@11: yading@11: return 0; yading@11: fail: yading@11: free_variant_list(c); yading@11: return ret; yading@11: } yading@11: yading@11: static int recheck_discard_flags(AVFormatContext *s, int first) yading@11: { yading@11: HLSContext *c = s->priv_data; yading@11: int i, changed = 0; yading@11: yading@11: /* Check if any new streams are needed */ yading@11: for (i = 0; i < c->n_variants; i++) yading@11: c->variants[i]->cur_needed = 0; yading@11: yading@11: for (i = 0; i < s->nb_streams; i++) { yading@11: AVStream *st = s->streams[i]; yading@11: struct variant *var = c->variants[s->streams[i]->id]; yading@11: if (st->discard < AVDISCARD_ALL) yading@11: var->cur_needed = 1; yading@11: } yading@11: for (i = 0; i < c->n_variants; i++) { yading@11: struct variant *v = c->variants[i]; yading@11: if (v->cur_needed && !v->needed) { yading@11: v->needed = 1; yading@11: changed = 1; yading@11: v->cur_seq_no = c->cur_seq_no; yading@11: v->pb.eof_reached = 0; yading@11: av_log(s, AV_LOG_INFO, "Now receiving variant %d\n", i); yading@11: } else if (first && !v->cur_needed && v->needed) { yading@11: if (v->input) yading@11: ffurl_close(v->input); yading@11: v->input = NULL; yading@11: v->needed = 0; yading@11: changed = 1; yading@11: av_log(s, AV_LOG_INFO, "No longer receiving variant %d\n", i); yading@11: } yading@11: } yading@11: return changed; yading@11: } yading@11: yading@11: static int hls_read_packet(AVFormatContext *s, AVPacket *pkt) yading@11: { yading@11: HLSContext *c = s->priv_data; yading@11: int ret, i, minvariant = -1; yading@11: yading@11: if (c->first_packet) { yading@11: recheck_discard_flags(s, 1); yading@11: c->first_packet = 0; yading@11: } yading@11: yading@11: start: yading@11: c->end_of_segment = 0; yading@11: for (i = 0; i < c->n_variants; i++) { yading@11: struct variant *var = c->variants[i]; yading@11: /* Make sure we've got one buffered packet from each open variant yading@11: * stream */ yading@11: if (var->needed && !var->pkt.data) { yading@11: while (1) { yading@11: int64_t ts_diff; yading@11: AVStream *st; yading@11: ret = av_read_frame(var->ctx, &var->pkt); yading@11: if (ret < 0) { yading@11: if (!url_feof(&var->pb) && ret != AVERROR_EOF) yading@11: return ret; yading@11: reset_packet(&var->pkt); yading@11: break; yading@11: } else { yading@11: if (c->first_timestamp == AV_NOPTS_VALUE) yading@11: c->first_timestamp = var->pkt.dts; yading@11: } yading@11: yading@11: if (c->seek_timestamp == AV_NOPTS_VALUE) yading@11: break; yading@11: yading@11: if (var->pkt.dts == AV_NOPTS_VALUE) { yading@11: c->seek_timestamp = AV_NOPTS_VALUE; yading@11: break; yading@11: } yading@11: yading@11: st = var->ctx->streams[var->pkt.stream_index]; yading@11: ts_diff = av_rescale_rnd(var->pkt.dts, AV_TIME_BASE, yading@11: st->time_base.den, AV_ROUND_DOWN) - yading@11: c->seek_timestamp; yading@11: if (ts_diff >= 0 && (c->seek_flags & AVSEEK_FLAG_ANY || yading@11: var->pkt.flags & AV_PKT_FLAG_KEY)) { yading@11: c->seek_timestamp = AV_NOPTS_VALUE; yading@11: break; yading@11: } yading@11: } yading@11: } yading@11: /* Check if this stream has the packet with the lowest dts */ yading@11: if (var->pkt.data) { yading@11: if(minvariant < 0) { yading@11: minvariant = i; yading@11: } else { yading@11: struct variant *minvar = c->variants[minvariant]; yading@11: int64_t dts = var->pkt.dts; yading@11: int64_t mindts = minvar->pkt.dts; yading@11: AVStream *st = var->ctx->streams[ var->pkt.stream_index]; yading@11: AVStream *minst= minvar->ctx->streams[minvar->pkt.stream_index]; yading@11: yading@11: if( st->start_time != AV_NOPTS_VALUE) dts -= st->start_time; yading@11: if(minst->start_time != AV_NOPTS_VALUE) mindts -= minst->start_time; yading@11: yading@11: if (av_compare_ts(dts, st->time_base, mindts, minst->time_base) < 0) yading@11: minvariant = i; yading@11: } yading@11: } yading@11: } yading@11: if (c->end_of_segment) { yading@11: if (recheck_discard_flags(s, 0)) yading@11: goto start; yading@11: } yading@11: /* If we got a packet, return it */ yading@11: if (minvariant >= 0) { yading@11: *pkt = c->variants[minvariant]->pkt; yading@11: pkt->stream_index += c->variants[minvariant]->stream_offset; yading@11: reset_packet(&c->variants[minvariant]->pkt); yading@11: return 0; yading@11: } yading@11: return AVERROR_EOF; yading@11: } yading@11: yading@11: static int hls_close(AVFormatContext *s) yading@11: { yading@11: HLSContext *c = s->priv_data; yading@11: yading@11: free_variant_list(c); yading@11: return 0; yading@11: } yading@11: yading@11: static int hls_read_seek(AVFormatContext *s, int stream_index, yading@11: int64_t timestamp, int flags) yading@11: { yading@11: HLSContext *c = s->priv_data; yading@11: int i, j, ret; yading@11: yading@11: if ((flags & AVSEEK_FLAG_BYTE) || !c->variants[0]->finished) yading@11: return AVERROR(ENOSYS); yading@11: yading@11: c->seek_flags = flags; yading@11: c->seek_timestamp = stream_index < 0 ? timestamp : yading@11: av_rescale_rnd(timestamp, AV_TIME_BASE, yading@11: s->streams[stream_index]->time_base.den, yading@11: flags & AVSEEK_FLAG_BACKWARD ? yading@11: AV_ROUND_DOWN : AV_ROUND_UP); yading@11: timestamp = av_rescale_rnd(timestamp, 1, stream_index >= 0 ? yading@11: s->streams[stream_index]->time_base.den : yading@11: AV_TIME_BASE, flags & AVSEEK_FLAG_BACKWARD ? yading@11: AV_ROUND_DOWN : AV_ROUND_UP); yading@11: if (s->duration < c->seek_timestamp) { yading@11: c->seek_timestamp = AV_NOPTS_VALUE; yading@11: return AVERROR(EIO); yading@11: } yading@11: yading@11: ret = AVERROR(EIO); yading@11: for (i = 0; i < c->n_variants; i++) { yading@11: /* Reset reading */ yading@11: struct variant *var = c->variants[i]; yading@11: int64_t pos = c->first_timestamp == AV_NOPTS_VALUE ? 0 : yading@11: av_rescale_rnd(c->first_timestamp, 1, stream_index >= 0 ? yading@11: s->streams[stream_index]->time_base.den : yading@11: AV_TIME_BASE, flags & AVSEEK_FLAG_BACKWARD ? yading@11: AV_ROUND_DOWN : AV_ROUND_UP); yading@11: if (var->input) { yading@11: ffurl_close(var->input); yading@11: var->input = NULL; yading@11: } yading@11: av_free_packet(&var->pkt); yading@11: reset_packet(&var->pkt); yading@11: var->pb.eof_reached = 0; yading@11: /* Clear any buffered data */ yading@11: var->pb.buf_end = var->pb.buf_ptr = var->pb.buffer; yading@11: /* Reset the pos, to let the mpegts demuxer know we've seeked. */ yading@11: var->pb.pos = 0; yading@11: yading@11: /* Locate the segment that contains the target timestamp */ yading@11: for (j = 0; j < var->n_segments; j++) { yading@11: if (timestamp >= pos && yading@11: timestamp < pos + var->segments[j]->duration) { yading@11: var->cur_seq_no = var->start_seq_no + j; yading@11: ret = 0; yading@11: break; yading@11: } yading@11: pos += var->segments[j]->duration; yading@11: } yading@11: if (ret) yading@11: c->seek_timestamp = AV_NOPTS_VALUE; yading@11: } yading@11: return ret; yading@11: } yading@11: yading@11: static int hls_probe(AVProbeData *p) yading@11: { yading@11: /* Require #EXTM3U at the start, and either one of the ones below yading@11: * somewhere for a proper match. */ yading@11: if (strncmp(p->buf, "#EXTM3U", 7)) yading@11: return 0; yading@11: if (strstr(p->buf, "#EXT-X-STREAM-INF:") || yading@11: strstr(p->buf, "#EXT-X-TARGETDURATION:") || yading@11: strstr(p->buf, "#EXT-X-MEDIA-SEQUENCE:")) yading@11: return AVPROBE_SCORE_MAX; yading@11: return 0; yading@11: } yading@11: yading@11: AVInputFormat ff_hls_demuxer = { yading@11: .name = "hls,applehttp", yading@11: .long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming"), yading@11: .priv_data_size = sizeof(HLSContext), yading@11: .read_probe = hls_probe, yading@11: .read_header = hls_read_header, yading@11: .read_packet = hls_read_packet, yading@11: .read_close = hls_close, yading@11: .read_seek = hls_read_seek, yading@11: };