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avformat/dashenc: addition of @availabilityTimeOffset in MPD 

availability time of Nth segment = availabilityStartTime + (N*segment duration) - availabilityTimeOffset.
This field helps to reduce the latency by about a segment duration in streaming mode.
This commit is contained in:
Vishwanath Dixit 2018-04-11 12:31:47 +05:30 committed by Karthick Jeyapal
parent 3e75057a1d
commit 990380367b
1 changed files with 13 additions and 1 deletions
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14
libavformat/dashenc.c
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@ -85,6 +85,7 @@ typedef struct OutputStream {
char filename[1024];
char full_path[1024];
char temp_path[1024];
double availability_time_offset;
} OutputStream;
typedef struct DASHContext {
@ -346,8 +347,12 @@ static void output_segment_list(OutputStream *os, AVIOContext *out, AVFormatCont
if (c->use_template) {
int timescale = c->use_timeline ? os->ctx->streams[0]->time_base.den : AV_TIME_BASE;
avio_printf(out, "\t\t\t\t<SegmentTemplate timescale=\"%d\" ", timescale);
if (!c->use_timeline)
if (!c->use_timeline) {
avio_printf(out, "duration=\"%"PRId64"\" ", c->seg_duration);
if (c->streaming && os->availability_time_offset)
avio_printf(out, "availabilityTimeOffset=\"%.3f\" ",
os->availability_time_offset);
}
avio_printf(out, "initialization=\"%s\" media=\"%s\" startNumber=\"%d\">\n", c->init_seg_name, c->media_seg_name, c->use_timeline ? start_number : 1);
if (c->use_timeline) {
int64_t cur_time = 0;
@ -1293,6 +1298,13 @@ static int dash_write_packet(AVFormatContext *s, AVPacket *pkt)
format_date_now(c->availability_start_time,
sizeof(c->availability_start_time));
if (!os->availability_time_offset && pkt->duration) {
int64_t frame_duration = av_rescale_q(pkt->duration, st->time_base,
AV_TIME_BASE_Q);
os->availability_time_offset = ((double) c->seg_duration -
frame_duration) / AV_TIME_BASE;
}
if (c->use_template && !c->use_timeline) {
elapsed_duration = pkt->pts - os->first_pts;
seg_end_duration = (int64_t) os->segment_index * c->seg_duration;