| /* |
| * 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 "avformat.h" |
| #include "internal.h" |
| #include <unistd.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 (preferrably 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 { |
| int duration; |
| char url[MAX_URL_SIZE]; |
| char key[MAX_URL_SIZE]; |
| enum KeyType key_type; |
| uint8_t iv[16]; |
| }; |
| |
| /* |
| * Each variant 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 variant { |
| int bandwidth; |
| 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; |
| int 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]; |
| }; |
| |
| typedef struct AppleHTTPContext { |
| int n_variants; |
| struct variant **variants; |
| 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; |
| } AppleHTTPContext; |
| |
| static int read_chomp_line(AVIOContext *s, char *buf, int maxlen) |
| { |
| int len = ff_get_line(s, buf, maxlen); |
| while (len > 0 && isspace(buf[len - 1])) |
| buf[--len] = '\0'; |
| return len; |
| } |
| |
| static void free_segment_list(struct variant *var) |
| { |
| int i; |
| for (i = 0; i < var->n_segments; i++) |
| av_free(var->segments[i]); |
| av_freep(&var->segments); |
| var->n_segments = 0; |
| } |
| |
| static void free_variant_list(AppleHTTPContext *c) |
| { |
| int i; |
| for (i = 0; i < c->n_variants; i++) { |
| struct variant *var = c->variants[i]; |
| free_segment_list(var); |
| av_free_packet(&var->pkt); |
| av_free(var->pb.buffer); |
| if (var->input) |
| ffurl_close(var->input); |
| if (var->ctx) { |
| var->ctx->pb = NULL; |
| avformat_close_input(&var->ctx); |
| } |
| 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 variant *new_variant(AppleHTTPContext *c, int bandwidth, |
| const char *url, const char *base) |
| { |
| struct variant *var = av_mallocz(sizeof(struct variant)); |
| if (!var) |
| return NULL; |
| reset_packet(&var->pkt); |
| var->bandwidth = bandwidth; |
| ff_make_absolute_url(var->url, sizeof(var->url), base, url); |
| dynarray_add(&c->variants, &c->n_variants, var); |
| 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(AppleHTTPContext *c, const char *url, |
| struct variant *var, AVIOContext *in) |
| { |
| int ret = 0, duration = 0, is_segment = 0, is_variant = 0, bandwidth = 0; |
| enum KeyType key_type = KEY_NONE; |
| uint8_t iv[16] = ""; |
| int has_iv = 0; |
| char key[MAX_URL_SIZE] = ""; |
| char line[1024]; |
| const char *ptr; |
| int close_in = 0; |
| |
| if (!in) { |
| close_in = 1; |
| if ((ret = avio_open2(&in, url, AVIO_FLAG_READ, |
| c->interrupt_callback, NULL)) < 0) |
| return ret; |
| } |
| |
| read_chomp_line(in, line, sizeof(line)); |
| if (strcmp(line, "#EXTM3U")) { |
| ret = AVERROR_INVALIDDATA; |
| goto fail; |
| } |
| |
| if (var) { |
| free_segment_list(var); |
| var->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 (!var) { |
| var = new_variant(c, 0, url, NULL); |
| if (!var) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| } |
| var->target_duration = atoi(ptr); |
| } else if (av_strstart(line, "#EXT-X-MEDIA-SEQUENCE:", &ptr)) { |
| if (!var) { |
| var = new_variant(c, 0, url, NULL); |
| if (!var) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| } |
| var->start_seq_no = atoi(ptr); |
| } else if (av_strstart(line, "#EXT-X-ENDLIST", &ptr)) { |
| if (var) |
| var->finished = 1; |
| } else if (av_strstart(line, "#EXTINF:", &ptr)) { |
| is_segment = 1; |
| duration = atoi(ptr); |
| } 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 (!var) { |
| var = new_variant(c, 0, url, NULL); |
| if (!var) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| } |
| 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 = var->start_seq_no + var->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(&var->segments, &var->n_segments, seg); |
| is_segment = 0; |
| } |
| } |
| } |
| if (var) |
| var->last_load_time = av_gettime(); |
| |
| fail: |
| if (close_in) |
| avio_close(in); |
| return ret; |
| } |
| |
| static int open_input(struct variant *var) |
| { |
| struct segment *seg = var->segments[var->cur_seq_no - var->start_seq_no]; |
| if (seg->key_type == KEY_NONE) { |
| return ffurl_open(&var->input, seg->url, AVIO_FLAG_READ, |
| &var->parent->interrupt_callback, NULL); |
| } else if (seg->key_type == KEY_AES_128) { |
| char iv[33], key[33], url[MAX_URL_SIZE]; |
| int ret; |
| if (strcmp(seg->key, var->key_url)) { |
| URLContext *uc; |
| if (ffurl_open(&uc, seg->key, AVIO_FLAG_READ, |
| &var->parent->interrupt_callback, NULL) == 0) { |
| if (ffurl_read_complete(uc, var->key, sizeof(var->key)) |
| != sizeof(var->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(var->key_url, seg->key, sizeof(var->key_url)); |
| } |
| ff_data_to_hex(iv, seg->iv, sizeof(seg->iv), 0); |
| ff_data_to_hex(key, var->key, sizeof(var->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(&var->input, url, AVIO_FLAG_READ, |
| &var->parent->interrupt_callback)) < 0) |
| return ret; |
| av_opt_set(var->input->priv_data, "key", key, 0); |
| av_opt_set(var->input->priv_data, "iv", iv, 0); |
| if ((ret = ffurl_connect(var->input, NULL)) < 0) { |
| ffurl_close(var->input); |
| var->input = NULL; |
| return ret; |
| } |
| return 0; |
| } |
| return AVERROR(ENOSYS); |
| } |
| |
| static int read_data(void *opaque, uint8_t *buf, int buf_size) |
| { |
| struct variant *v = opaque; |
| AppleHTTPContext *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 variant playlists now. */ |
| int64_t reload_interval = v->n_segments > 0 ? |
| v->segments[v->n_segments - 1]->duration : |
| v->target_duration; |
| reload_interval *= 1000000; |
| |
| 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 * 500000; |
| } |
| 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; |
| usleep(100*1000); |
| } |
| /* Enough time has elapsed since the last reload */ |
| goto reload; |
| } |
| |
| ret = open_input(v); |
| if (ret < 0) |
| return ret; |
| } |
| ret = ffurl_read(v->input, buf, buf_size); |
| if (ret > 0) |
| return ret; |
| if (ret < 0 && ret != AVERROR_EOF) |
| 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->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 variant %d\n", |
| v->index); |
| return AVERROR_EOF; |
| } |
| goto restart; |
| } |
| |
| static int applehttp_read_header(AVFormatContext *s, AVFormatParameters *ap) |
| { |
| AppleHTTPContext *c = s->priv_data; |
| int ret = 0, i, j, stream_offset = 0; |
| |
| c->interrupt_callback = &s->interrupt_callback; |
| |
| 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 variants, parse each individual |
| * variant playlist. */ |
| if (c->n_variants > 1 || c->variants[0]->n_segments == 0) { |
| for (i = 0; i < c->n_variants; i++) { |
| struct variant *v = c->variants[i]; |
| if ((ret = parse_playlist(c, v->url, v, NULL)) < 0) |
| goto fail; |
| } |
| } |
| |
| if (c->variants[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]->finished) { |
| int64_t duration = 0; |
| for (i = 0; i < c->variants[0]->n_segments; i++) |
| duration += c->variants[0]->segments[i]->duration; |
| s->duration = duration * AV_TIME_BASE; |
| } |
| |
| /* Open the demuxer for each variant */ |
| for (i = 0; i < c->n_variants; i++) { |
| struct variant *v = c->variants[i]; |
| AVInputFormat *in_fmt = NULL; |
| char bitrate_str[20]; |
| if (v->n_segments == 0) |
| continue; |
| |
| if (!(v->ctx = avformat_alloc_context())) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| |
| v->index = i; |
| v->needed = 1; |
| v->parent = s; |
| |
| /* If this is a live stream with more than 3 segments, start at the |
| * third last segment. */ |
| v->cur_seq_no = v->start_seq_no; |
| if (!v->finished && v->n_segments > 3) |
| v->cur_seq_no = v->start_seq_no + v->n_segments - 3; |
| |
| v->read_buffer = av_malloc(INITIAL_BUFFER_SIZE); |
| ffio_init_context(&v->pb, v->read_buffer, INITIAL_BUFFER_SIZE, 0, v, |
| read_data, NULL, NULL); |
| v->pb.seekable = 0; |
| ret = av_probe_input_buffer(&v->pb, &in_fmt, v->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. */ |
| avformat_free_context(v->ctx); |
| v->ctx = NULL; |
| goto fail; |
| } |
| v->ctx->pb = &v->pb; |
| ret = avformat_open_input(&v->ctx, v->segments[0]->url, in_fmt, NULL); |
| if (ret < 0) |
| goto fail; |
| v->stream_offset = stream_offset; |
| snprintf(bitrate_str, sizeof(bitrate_str), "%d", v->bandwidth); |
| /* Create new AVStreams for each stream in this variant */ |
| for (j = 0; j < v->ctx->nb_streams; j++) { |
| AVStream *st = avformat_new_stream(s, NULL); |
| if (!st) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| st->id = i; |
| avcodec_copy_context(st->codec, v->ctx->streams[j]->codec); |
| if (v->bandwidth) |
| av_dict_set(&st->metadata, "variant_bitrate", bitrate_str, |
| 0); |
| } |
| stream_offset += v->ctx->nb_streams; |
| } |
| |
| c->first_packet = 1; |
| c->first_timestamp = AV_NOPTS_VALUE; |
| c->seek_timestamp = AV_NOPTS_VALUE; |
| |
| return 0; |
| fail: |
| free_variant_list(c); |
| return ret; |
| } |
| |
| static int recheck_discard_flags(AVFormatContext *s, int first) |
| { |
| AppleHTTPContext *c = s->priv_data; |
| int i, changed = 0; |
| |
| /* Check if any new streams are needed */ |
| for (i = 0; i < c->n_variants; i++) |
| c->variants[i]->cur_needed = 0; |
| |
| for (i = 0; i < s->nb_streams; i++) { |
| AVStream *st = s->streams[i]; |
| struct variant *var = c->variants[s->streams[i]->id]; |
| if (st->discard < AVDISCARD_ALL) |
| var->cur_needed = 1; |
| } |
| for (i = 0; i < c->n_variants; i++) { |
| struct variant *v = c->variants[i]; |
| if (v->cur_needed && !v->needed) { |
| v->needed = 1; |
| changed = 1; |
| v->cur_seq_no = c->cur_seq_no; |
| v->pb.eof_reached = 0; |
| av_log(s, AV_LOG_INFO, "Now receiving variant %d\n", i); |
| } else if (first && !v->cur_needed && v->needed) { |
| if (v->input) |
| ffurl_close(v->input); |
| v->input = NULL; |
| v->needed = 0; |
| changed = 1; |
| av_log(s, AV_LOG_INFO, "No longer receiving variant %d\n", i); |
| } |
| } |
| return changed; |
| } |
| |
| static int applehttp_read_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| AppleHTTPContext *c = s->priv_data; |
| int ret, i, minvariant = -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_variants; i++) { |
| struct variant *var = c->variants[i]; |
| /* Make sure we've got one buffered packet from each open variant |
| * stream */ |
| if (var->needed && !var->pkt.data) { |
| while (1) { |
| int64_t ts_diff; |
| ret = av_read_frame(var->ctx, &var->pkt); |
| if (ret < 0) { |
| if (!url_feof(&var->pb)) { |
| return ret; |
| } else { |
| if ((var->cur_seq_no - var->start_seq_no) == (var->n_segments)) { |
| return AVERROR_EOF; |
| } |
| } |
| reset_packet(&var->pkt); |
| } else { |
| if (c->first_timestamp == AV_NOPTS_VALUE) |
| c->first_timestamp = var->pkt.dts; |
| } |
| |
| if (c->seek_timestamp == AV_NOPTS_VALUE) |
| break; |
| |
| if (var->pkt.dts == AV_NOPTS_VALUE) { |
| c->seek_timestamp = AV_NOPTS_VALUE; |
| break; |
| } |
| |
| ts_diff = var->pkt.dts - c->seek_timestamp; |
| if (ts_diff >= 0) { |
| if (c->seek_flags & AVSEEK_FLAG_ANY) { |
| c->seek_timestamp = AV_NOPTS_VALUE; |
| break; |
| } |
| |
| /* Seek to keyframe */ |
| if (var->pkt.flags & AV_PKT_FLAG_KEY) { |
| c->seek_timestamp = AV_NOPTS_VALUE; |
| break; |
| } |
| } |
| } |
| } |
| /* Check if this stream has the packet with the lowest dts */ |
| if (var->pkt.data) { |
| if (minvariant < 0 || |
| var->pkt.dts < c->variants[minvariant]->pkt.dts) |
| minvariant = i; |
| } |
| } |
| if (c->end_of_segment) { |
| if (recheck_discard_flags(s, 0)) |
| goto start; |
| } |
| /* If we got a packet, return it */ |
| if (minvariant >= 0) { |
| *pkt = c->variants[minvariant]->pkt; |
| pkt->stream_index += c->variants[minvariant]->stream_offset; |
| reset_packet(&c->variants[minvariant]->pkt); |
| return 0; |
| } |
| return AVERROR_EOF; |
| } |
| |
| static int applehttp_close(AVFormatContext *s) |
| { |
| AppleHTTPContext *c = s->priv_data; |
| |
| free_variant_list(c); |
| return 0; |
| } |
| |
| static int applehttp_read_seek(AVFormatContext *s, int stream_index, |
| int64_t timestamp, int flags) |
| { |
| AppleHTTPContext *c = s->priv_data; |
| int i, j, ret; |
| |
| if ((flags & AVSEEK_FLAG_BYTE) || !c->variants[0]->finished) |
| return AVERROR(ENOSYS); |
| |
| c->seek_timestamp = timestamp; |
| c->seek_flags = flags; |
| timestamp = av_rescale_rnd(timestamp, 1, 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_variants; i++) { |
| /* Reset reading */ |
| struct variant *var = c->variants[i]; |
| int64_t pos = c->first_timestamp == AV_NOPTS_VALUE ? 0 : |
| av_rescale_rnd(c->first_timestamp, 1, stream_index >= 0 ? |
| s->streams[stream_index]->time_base.den : |
| AV_TIME_BASE, flags & AVSEEK_FLAG_BACKWARD ? |
| AV_ROUND_DOWN : AV_ROUND_UP); |
| if (var->input) { |
| ffurl_close(var->input); |
| var->input = NULL; |
| } |
| av_free_packet(&var->pkt); |
| reset_packet(&var->pkt); |
| var->pb.eof_reached = 0; |
| |
| /* Locate the segment that contains the target timestamp */ |
| for (j = 0; j < var->n_segments; j++) { |
| if (timestamp >= pos && |
| timestamp < pos + var->segments[j]->duration) { |
| var->cur_seq_no = var->start_seq_no + j; |
| ret = 0; |
| break; |
| } |
| pos += var->segments[j]->duration; |
| } |
| if (ret != 0) |
| c->seek_timestamp = AV_NOPTS_VALUE; |
| } |
| return ret; |
| } |
| |
| static int applehttp_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_applehttp_demuxer = { |
| .name = "applehttp", |
| .long_name = NULL_IF_CONFIG_SMALL("Apple HTTP Live Streaming format"), |
| .priv_data_size = sizeof(AppleHTTPContext), |
| .read_probe = applehttp_probe, |
| .read_header = applehttp_read_header, |
| .read_packet = applehttp_read_packet, |
| .read_close = applehttp_close, |
| .read_seek = applehttp_read_seek, |
| }; |