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dashdec: Support for multiple video/audio streams

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Signed-off-by: Steven Liu <lq@chinaffmpeg.org>
pull/304/head
sfan5 7 years ago committed by Steven Liu
parent 66e551eafb
commit 94cc16499f
2 changed files with 223 additions and 129 deletions
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  1. 10
      doc/demuxers.texi
  2. 342
      libavformat/dashdec.c

10
doc/demuxers.texi
Unescape View File

@ -244,6 +244,16 @@ file subdir/file-2.wav
@end example
@end itemize
@section dash
Dynamic Adaptive Streaming over HTTP demuxer.
This demuxer presents all AVStreams found in the manifest.
By setting the discard flags on AVStreams the caller can decide
which streams to actually receive.
Each stream mirrors the @code{id} and @code{bandwidth} properties from the
@code{<Representation>} as metadata keys named "id" and "variant_bitrate" respectively.
@section flv, live_flv
Adobe Flash Video Format demuxer.

342
libavformat/dashdec.c
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@ -86,6 +86,7 @@ struct representation {
enum AVMediaType type;
char id[20];
int bandwidth;
AVStream *assoc_stream; /* demuxer stream associated with this representation */
int n_fragments;
struct fragment **fragments; /* VOD list of fragment for profile */
@ -120,8 +121,11 @@ struct representation {
typedef struct DASHContext {
const AVClass *class;
char *base_url;
struct representation *cur_video;
struct representation *cur_audio;
int n_videos;
struct representation **videos;
int n_audios;
struct representation **audios;
/* MediaPresentationDescription Attribute */
uint64_t media_presentation_duration;
@ -333,6 +337,28 @@ static void free_representation(struct representation *pls)
av_freep(&pls);
}
static void free_video_list(DASHContext *c)
{
int i;
for (i = 0; i < c->n_videos; i++) {
struct representation *pls = c->videos[i];
free_representation(pls);
}
av_freep(&c->videos);
c->n_videos = 0;
}
static void free_audio_list(DASHContext *c)
{
int i;
for (i = 0; i < c->n_audios; i++) {
struct representation *pls = c->audios[i];
free_representation(pls);
}
av_freep(&c->audios);
c->n_audios = 0;
}
static void set_httpheader_options(DASHContext *c, AVDictionary **opts)
{
// broker prior HTTP options that should be consistent across requests
@ -658,7 +684,7 @@ static int parse_manifest_representation(AVFormatContext *s, const char *url,
type = get_content_type(adaptionset_node);
if (type == AVMEDIA_TYPE_UNKNOWN) {
av_log(s, AV_LOG_VERBOSE, "Parsing '%s' - skipp not supported representation type\n", url);
} else if ((type == AVMEDIA_TYPE_VIDEO && !c->cur_video) || (type == AVMEDIA_TYPE_AUDIO && !c->cur_audio)) {
} else if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO) {
// convert selected representation to our internal struct
rep = av_mallocz(sizeof(struct representation));
if (!rep) {
@ -807,10 +833,10 @@ static int parse_manifest_representation(AVFormatContext *s, const char *url,
strncpy(rep->id, rep_id_val ? rep_id_val : "", sizeof(rep->id));
if (type == AVMEDIA_TYPE_VIDEO) {
rep->rep_idx = video_rep_idx;
c->cur_video = rep;
dynarray_add(&c->videos, &c->n_videos, rep);
} else {
rep->rep_idx = audio_rep_idx;
c->cur_audio = rep;
dynarray_add(&c->audios, &c->n_audios, rep);
}
}
}
@ -883,8 +909,6 @@ static int parse_manifest(AVFormatContext *s, const char *url, AVIOContext *in)
char *val = NULL;
uint32_t perdiod_duration_sec = 0;
uint32_t perdiod_start_sec = 0;
int32_t audio_rep_idx = 0;
int32_t video_rep_idx = 0;
if (!in) {
close_in = 1;
@ -1014,14 +1038,6 @@ static int parse_manifest(AVFormatContext *s, const char *url, AVIOContext *in)
}
adaptionset_node = xmlNextElementSibling(adaptionset_node);
}
if (c->cur_video) {
c->cur_video->rep_count = video_rep_idx;
av_log(s, AV_LOG_VERBOSE, "rep_idx[%d]\n", (int)c->cur_video->rep_idx);
av_log(s, AV_LOG_VERBOSE, "rep_count[%d]\n", (int)video_rep_idx);
}
if (c->cur_audio) {
c->cur_audio->rep_count = audio_rep_idx;
}
cleanup:
/*free the document */
xmlFreeDoc(doc);
@ -1139,48 +1155,69 @@ static void move_segments(struct representation *rep_src, struct representation
static int refresh_manifest(AVFormatContext *s)
{
int ret = 0;
int ret = 0, i;
DASHContext *c = s->priv_data;
// save current context
struct representation *cur_video = c->cur_video;
struct representation *cur_audio = c->cur_audio;
int n_videos = c->n_videos;
struct representation **videos = c->videos;
int n_audios = c->n_audios;
struct representation **audios = c->audios;
char *base_url = c->base_url;
c->base_url = NULL;
c->cur_video = NULL;
c->cur_audio = NULL;
c->n_videos = 0;
c->videos = NULL;
c->n_audios = 0;
c->audios = NULL;
ret = parse_manifest(s, s->filename, NULL);
if (ret)
goto finish;
if (cur_video && cur_video->timelines || cur_audio && cur_audio->timelines) {
// calc current time
int64_t currentVideoTime = 0;
int64_t currentAudioTime = 0;
if (cur_video && cur_video->timelines)
currentVideoTime = get_segment_start_time_based_on_timeline(cur_video, cur_video->cur_seq_no) / cur_video->fragment_timescale;
if (cur_audio && cur_audio->timelines)
currentAudioTime = get_segment_start_time_based_on_timeline(cur_audio, cur_audio->cur_seq_no) / cur_audio->fragment_timescale;
// update segments
if (cur_video && cur_video->timelines) {
c->cur_video->cur_seq_no = calc_next_seg_no_from_timelines(c->cur_video, currentVideoTime * cur_video->fragment_timescale - 1);
if (c->cur_video->cur_seq_no >= 0) {
move_timelines(c->cur_video, cur_video, c);
if (c->n_videos != n_videos) {
av_log(c, AV_LOG_ERROR,
"new manifest has mismatched no. of video representations, %d -> %d\n",
n_videos, c->n_videos);
return AVERROR_INVALIDDATA;
}
if (c->n_audios != n_audios) {
av_log(c, AV_LOG_ERROR,
"new manifest has mismatched no. of audio representations, %d -> %d\n",
n_audios, c->n_audios);
return AVERROR_INVALIDDATA;
}
for (i = 0; i < n_videos; i++) {
struct representation *cur_video = videos[i];
struct representation *ccur_video = c->videos[i];
if (cur_video->timelines) {
// calc current time
int64_t currentTime = get_segment_start_time_based_on_timeline(cur_video, cur_video->cur_seq_no) / cur_video->fragment_timescale;
// update segments
ccur_video->cur_seq_no = calc_next_seg_no_from_timelines(ccur_video, currentTime * cur_video->fragment_timescale - 1);
if (ccur_video->cur_seq_no >= 0) {
move_timelines(ccur_video, cur_video, c);
}
}
if (cur_audio && cur_audio->timelines) {
c->cur_audio->cur_seq_no = calc_next_seg_no_from_timelines(c->cur_audio, currentAudioTime * cur_audio->fragment_timescale - 1);
if (c->cur_audio->cur_seq_no >= 0) {
move_timelines(c->cur_audio, cur_audio, c);
}
if (cur_video->fragments) {
move_segments(ccur_video, cur_video, c);
}
}
if (cur_video && cur_video->fragments) {
move_segments(c->cur_video, cur_video, c);
}
if (cur_audio && cur_audio->fragments) {
move_segments(c->cur_audio, cur_audio, c);
for (i = 0; i < n_audios; i++) {
struct representation *cur_audio = audios[i];
struct representation *ccur_audio = c->audios[i];
if (cur_audio->timelines) {
// calc current time
int64_t currentTime = get_segment_start_time_based_on_timeline(cur_audio, cur_audio->cur_seq_no) / cur_audio->fragment_timescale;
// update segments
ccur_audio->cur_seq_no = calc_next_seg_no_from_timelines(ccur_audio, currentTime * cur_audio->fragment_timescale - 1);
if (ccur_audio->cur_seq_no >= 0) {
move_timelines(ccur_audio, cur_audio, c);
}
}
if (cur_audio->fragments) {
move_segments(ccur_audio, cur_audio, c);
}
}
finish:
@ -1189,12 +1226,14 @@ finish:
av_free(base_url);
else
c->base_url = base_url;
if (c->cur_audio)
free_representation(c->cur_audio);
if (c->cur_video)
free_representation(c->cur_video);
c->cur_audio = cur_audio;
c->cur_video = cur_video;
if (c->audios)
free_audio_list(c);
if (c->videos)
free_video_list(c);
c->n_audios = n_audios;
c->audios = audios;
c->n_videos = n_videos;
c->videos = videos;
return ret;
}
@ -1493,6 +1532,16 @@ static int nested_io_open(AVFormatContext *s, AVIOContext **pb, const char *url,
return AVERROR(EPERM);
}
static void close_demux_for_component(struct representation *pls)
{
/* note: the internal buffer could have changed */
av_freep(&pls->pb.buffer);
memset(&pls->pb, 0x00, sizeof(AVIOContext));
pls->ctx->pb = NULL;
avformat_close_input(&pls->ctx);
pls->ctx = NULL;
}
static int reopen_demux_for_component(AVFormatContext *s, struct representation *pls)
{
DASHContext *c = s->priv_data;
@ -1502,12 +1551,7 @@ static int reopen_demux_for_component(AVFormatContext *s, struct representation
int ret = 0;
if (pls->ctx) {
/* note: the internal buffer could have changed, and be != avio_ctx_buffer */
av_freep(&pls->pb.buffer);
memset(&pls->pb, 0x00, sizeof(AVIOContext));
pls->ctx->pb = NULL;
avformat_close_input(&pls->ctx);
pls->ctx = NULL;
close_demux_for_component(pls);
}
if (!(pls->ctx = avformat_alloc_context())) {
ret = AVERROR(ENOMEM);
@ -1596,6 +1640,7 @@ static int dash_read_header(AVFormatContext *s)
DASHContext *c = s->priv_data;
int ret = 0;
int stream_index = 0;
int i;
c->interrupt_callback = &s->interrupt_callback;
// if the URL context is good, read important options we must broker later
@ -1617,27 +1662,23 @@ static int dash_read_header(AVFormatContext *s)
s->duration = (int64_t) c->media_presentation_duration * AV_TIME_BASE;
}
/* Open the demuxer for curent video and current audio components if available */
if (!ret && c->cur_video) {
ret = open_demux_for_component(s, c->cur_video);
if (!ret) {
c->cur_video->stream_index = stream_index;
++stream_index;
} else {
free_representation(c->cur_video);
c->cur_video = NULL;
}
/* Open the demuxer for video and audio components if available */
for (i = 0; i < c->n_videos; i++) {
struct representation *cur_video = c->videos[i];
ret = open_demux_for_component(s, cur_video);
if (ret)
goto fail;
cur_video->stream_index = stream_index;
++stream_index;
}
if (!ret && c->cur_audio) {
ret = open_demux_for_component(s, c->cur_audio);
if (!ret) {
c->cur_audio->stream_index = stream_index;
++stream_index;
} else {
free_representation(c->cur_audio);
c->cur_audio = NULL;
}
for (i = 0; i < c->n_audios; i++) {
struct representation *cur_audio = c->audios[i];
ret = open_demux_for_component(s, cur_audio);
if (ret)
goto fail;
cur_audio->stream_index = stream_index;
++stream_index;
}
if (!stream_index) {
@ -1653,21 +1694,25 @@ static int dash_read_header(AVFormatContext *s)
goto fail;
}
if (c->cur_video) {
int stream_index = c->cur_video->stream_index;
av_program_add_stream_index(s, 0, stream_index);
if (c->cur_video->bandwidth > 0)
av_dict_set_int(&s->streams[stream_index]->metadata, "variant_bitrate", c->cur_video->bandwidth, 0);
if (c->cur_video->id[0])
av_dict_set(&s->streams[stream_index]->metadata, "id", c->cur_video->id, 0);
}
if (c->cur_audio) {
int stream_index = c->cur_audio->stream_index;
av_program_add_stream_index(s, 0, stream_index);
if (c->cur_audio->bandwidth > 0)
av_dict_set_int(&s->streams[stream_index]->metadata, "variant_bitrate", c->cur_audio->bandwidth, 0);
if (c->cur_audio->id[0])
av_dict_set(&s->streams[stream_index]->metadata, "id", c->cur_audio->id, 0);
for (i = 0; i < c->n_videos; i++) {
struct representation *pls = c->videos[i];
av_program_add_stream_index(s, 0, pls->stream_index);
pls->assoc_stream = s->streams[pls->stream_index];
if (pls->bandwidth > 0)
av_dict_set_int(&pls->assoc_stream->metadata, "variant_bitrate", pls->bandwidth, 0);
if (pls->id[0])
av_dict_set(&pls->assoc_stream->metadata, "id", pls->id, 0);
}
for (i = 0; i < c->n_audios; i++) {
struct representation *pls = c->audios[i];
av_program_add_stream_index(s, 0, pls->stream_index);
pls->assoc_stream = s->streams[pls->stream_index];
if (pls->bandwidth > 0)
av_dict_set_int(&pls->assoc_stream->metadata, "variant_bitrate", pls->bandwidth, 0);
if (pls->id[0])
av_dict_set(&pls->assoc_stream->metadata, "id", pls->id, 0);
}
}
@ -1676,43 +1721,79 @@ fail:
return ret;
}
static void recheck_discard_flags(AVFormatContext *s, struct representation **p, int n)
{
int i, j;
for (i = 0; i < n; i++) {
struct representation *pls = p[i];
int needed = !pls->assoc_stream || pls->assoc_stream->discard < AVDISCARD_ALL;
if (needed && !pls->ctx) {
pls->cur_seg_offset = 0;
pls->init_sec_buf_read_offset = 0;
/* Catch up */
for (j = 0; j < n; j++) {
pls->cur_seq_no = FFMAX(pls->cur_seq_no, p[j]->cur_seq_no);
}
reopen_demux_for_component(s, pls);
av_log(s, AV_LOG_INFO, "Now receiving stream_index %d\n", pls->stream_index);
} else if (!needed && pls->ctx) {
close_demux_for_component(pls);
if (pls->input)
ff_format_io_close(pls->parent, &pls->input);
av_log(s, AV_LOG_INFO, "No longer receiving stream_index %d\n", pls->stream_index);
}
}
}
static int dash_read_packet(AVFormatContext *s, AVPacket *pkt)
{
DASHContext *c = s->priv_data;
int ret = 0;
int ret = 0, i;
int64_t mints = 0;
struct representation *cur = NULL;
if (!c->cur_audio && !c->cur_video ) {
return AVERROR_INVALIDDATA;
recheck_discard_flags(s, c->videos, c->n_videos);
recheck_discard_flags(s, c->audios, c->n_audios);
for (i = 0; i < c->n_videos; i++) {
struct representation *pls = c->videos[i];
if (!pls->ctx)
continue;
if (!cur || pls->cur_timestamp < mints) {
cur = pls;
mints = pls->cur_timestamp;
}
}
if (c->cur_audio && !c->cur_video) {
cur = c->cur_audio;
} else if (!c->cur_audio && c->cur_video) {
cur = c->cur_video;
} else if (c->cur_video->cur_timestamp < c->cur_audio->cur_timestamp) {
cur = c->cur_video;
} else {
cur = c->cur_audio;
for (i = 0; i < c->n_audios; i++) {
struct representation *pls = c->audios[i];
if (!pls->ctx)
continue;
if (!cur || pls->cur_timestamp < mints) {
cur = pls;
mints = pls->cur_timestamp;
}
}
if (cur->ctx) {
while (!ff_check_interrupt(c->interrupt_callback) && !ret) {
ret = av_read_frame(cur->ctx, pkt);
if (ret >= 0) {
/* If we got a packet, return it */
cur->cur_timestamp = av_rescale(pkt->pts, (int64_t)cur->ctx->streams[0]->time_base.num * 90000, cur->ctx->streams[0]->time_base.den);
pkt->stream_index = cur->stream_index;
return 0;
}
if (cur->is_restart_needed) {
cur->cur_seg_offset = 0;
cur->init_sec_buf_read_offset = 0;
if (cur->input)
ff_format_io_close(cur->parent, &cur->input);
ret = reopen_demux_for_component(s, cur);
cur->is_restart_needed = 0;
}
if (!cur) {
return AVERROR_INVALIDDATA;
}
while (!ff_check_interrupt(c->interrupt_callback) && !ret) {
ret = av_read_frame(cur->ctx, pkt);
if (ret >= 0) {
/* If we got a packet, return it */
cur->cur_timestamp = av_rescale(pkt->pts, (int64_t)cur->ctx->streams[0]->time_base.num * 90000, cur->ctx->streams[0]->time_base.den);
pkt->stream_index = cur->stream_index;
return 0;
}
if (cur->is_restart_needed) {
cur->cur_seg_offset = 0;
cur->init_sec_buf_read_offset = 0;
if (cur->input)
ff_format_io_close(cur->parent, &cur->input);
ret = reopen_demux_for_component(s, cur);
cur->is_restart_needed = 0;
}
}
return AVERROR_EOF;
@ -1721,12 +1802,8 @@ static int dash_read_packet(AVFormatContext *s, AVPacket *pkt)
static int dash_close(AVFormatContext *s)
{
DASHContext *c = s->priv_data;
if (c->cur_audio) {
free_representation(c->cur_audio);
}
if (c->cur_video) {
free_representation(c->cur_video);
}
free_audio_list(c);
free_video_list(c);
av_freep(&c->cookies);
av_freep(&c->user_agent);
@ -1799,7 +1876,7 @@ set_seq_num:
static int dash_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
{
int ret = 0;
int ret, i;
DASHContext *c = s->priv_data;
int64_t seek_pos_msec = av_rescale_rnd(timestamp, 1000,
s->streams[stream_index]->time_base.den,
@ -1807,12 +1884,19 @@ static int dash_read_seek(AVFormatContext *s, int stream_index, int64_t timestam
AV_ROUND_DOWN : AV_ROUND_UP);
if ((flags & AVSEEK_FLAG_BYTE) || c->is_live)
return AVERROR(ENOSYS);
if (c->cur_audio) {
ret = dash_seek(s, c->cur_audio, seek_pos_msec, flags);
ret = AVERROR_EOF;
for (i = 0; i < c->n_videos; i++) {
if (c->videos[i]->stream_index == stream_index) {
ret = dash_seek(s, c->videos[i], seek_pos_msec, flags);
}
}
if (!ret && c->cur_video) {
ret = dash_seek(s, c->cur_video, seek_pos_msec, flags);
for (i = 0; i < c->n_audios; i++) {
if (c->audios[i]->stream_index == stream_index) {
ret = dash_seek(s, c->audios[i], seek_pos_msec, flags);
}
}
return ret;
}

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