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dashdec: Expose bandwidth and representation ID as metadata 

The primary goal was making it viable to play YouTube/Vimeo/... videos
using the native demuxer, since mpv currently uses a workaround in form
of Edit Decision Lists (EDL).

Implemented features:

1 Exposing id / bitrate as stream metadata (similar to the HLS demuxer)
2 Support for multiple video and audio streams
3 A few minor parts of the specification that are in use at YouTube

Signed-off-by: Steven Liu <lq@chinaffmpeg.org>
This commit is contained in:
sfan5 2018-01-14 22:33:57 +08:00 committed by Steven Liu
parent 96f94624e0
commit 66e551eafb
1 changed files with 16 additions and 2 deletions
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18
libavformat/dashdec.c
View File

@ -84,6 +84,8 @@ struct representation {
int stream_index;
enum AVMediaType type;
char id[20];
int bandwidth;
int n_fragments;
struct fragment **fragments; /* VOD list of fragment for profile */
@ -801,6 +803,8 @@ static int parse_manifest_representation(AVFormatContext *s, const char *url,
if (rep) {
if (rep->fragment_duration > 0 && !rep->fragment_timescale)
rep->fragment_timescale = 1;
rep->bandwidth = rep_bandwidth_val ? atoi(rep_bandwidth_val) : 0;
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;
@ -1650,10 +1654,20 @@ static int dash_read_header(AVFormatContext *s)
}
if (c->cur_video) {
av_program_add_stream_index(s, 0, c->cur_video->stream_index);
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) {
av_program_add_stream_index(s, 0, c->cur_audio->stream_index);
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);
}
}