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dashenc: Write segment timelines properly if the timeline has gaps 

Write a new start time if the duration of the previous segment
didn't match the start of the next one. Check that segments
actually are continuous before writing a repeat count.

This makes sure timestamps deduced from the timeline actually
match the real start timestamp as written in filenames (if
using a template containing $Time$).

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2014-11-28 10:40:05 +02:00
parent 6f4364aba9
commit 2f628d5943
1 changed files with 6 additions and 2 deletions
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8
libavformat/dashenc.c
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@ -208,20 +208,24 @@ static void output_segment_list(OutputStream *os, AVIOContext *out, DASHContext
avio_printf(out, "duration=\"%"PRId64"\" ", c->last_duration);
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;
avio_printf(out, "\t\t\t\t\t<SegmentTimeline>\n");
for (i = start_index; i < os->nb_segments; ) {
Segment *seg = os->segments[i];
int repeat = 0;
avio_printf(out, "\t\t\t\t\t\t<S ");
if (i == start_index)
if (i == start_index || seg->time != cur_time)
avio_printf(out, "t=\"%"PRId64"\" ", seg->time);
avio_printf(out, "d=\"%d\" ", seg->duration);
while (i + repeat + 1 < os->nb_segments && os->segments[i + repeat + 1]->duration == seg->duration)
while (i + repeat + 1 < os->nb_segments &&
os->segments[i + repeat + 1]->duration == seg->duration &&
os->segments[i + repeat + 1]->time == os->segments[i + repeat]->time + os->segments[i + repeat]->duration)
repeat++;
if (repeat > 0)
avio_printf(out, "r=\"%d\" ", repeat);
avio_printf(out, "/>\n");
i += 1 + repeat;
cur_time += (1 + repeat) * seg->duration;
}
avio_printf(out, "\t\t\t\t\t</SegmentTimeline>\n");
}