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dashdemux: Collect keyunit distance and size statistics

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This commit is contained in:
Sebastian Dröge 2016-09-01 17:47:11 +03:00 committed by Edward Hervey
parent d8d1fc8bc4
commit 2379dc3f5b
2 changed files with 64 additions and 23 deletions
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83
ext/dash/gstdashdemux.c
View file

@ -2058,8 +2058,7 @@ gst_dash_demux_need_another_chunk (GstAdaptiveDemuxStream * stream)
if (dashstream->isobmff_parser.current_fourcc == 0) {
stream->fragment.chunk_size += dashstream->moof_average_size;
if (dashstream->first_sync_sample_always_after_moof)
stream->fragment.chunk_size +=
dashstream->first_sync_sample_average_size;
stream->fragment.chunk_size += dashstream->keyframe_average_size;
}
if (gst_mpd_client_has_isoff_ondemand_profile (dashdemux->client) &&
@ -2516,31 +2515,71 @@ gst_dash_demux_find_sync_samples (GstAdaptiveDemux * demux,
}
{
GstDashStreamSyncSample *sync_sample =
&g_array_index (dash_stream->moof_sync_samples, GstDashStreamSyncSample,
0);
guint size = sync_sample->end_offset + 1 - sync_sample->start_offset;
GstDashStreamSyncSample *sync_sample;
guint i;
guint size;
GstClockTime current_keyframe_distance;
if (dash_stream->first_sync_sample_average_size) {
if (dash_stream->first_sync_sample_average_size < size)
dash_stream->first_sync_sample_average_size =
(size * 3 + dash_stream->first_sync_sample_average_size) / 4;
for (i = 0; i < dash_stream->moof_sync_samples->len; i++) {
sync_sample =
&g_array_index (dash_stream->moof_sync_samples,
GstDashStreamSyncSample, i);
size = sync_sample->end_offset + 1 - sync_sample->start_offset;
if (dash_stream->keyframe_average_size) {
/* Over-estimate the keyframe size */
if (dash_stream->keyframe_average_size < size)
dash_stream->keyframe_average_size =
(size * 3 + dash_stream->keyframe_average_size) / 4;
else
dash_stream->keyframe_average_size =
(size + dash_stream->keyframe_average_size * 3) / 4;
} else {
dash_stream->keyframe_average_size = size;
}
if (i == 0) {
if (dash_stream->moof_offset + dash_stream->moof_size + 8 <
sync_sample->start_offset) {
dash_stream->first_sync_sample_after_moof = FALSE;
dash_stream->first_sync_sample_always_after_moof = FALSE;
} else {
dash_stream->first_sync_sample_after_moof =
(dash_stream->moof_sync_samples->len == 1
|| demux->segment.rate > 0.0);
}
}
}
g_assert (stream->fragment.duration != 0);
g_assert (stream->fragment.duration != GST_CLOCK_TIME_NONE);
current_keyframe_distance =
stream->fragment.duration / dash_stream->moof_sync_samples->len;
if (dash_stream->keyframe_average_distance) {
/* Under-estimate the keyframe distance */
if (dash_stream->keyframe_average_distance > current_keyframe_distance)
dash_stream->keyframe_average_distance =
(dash_stream->keyframe_average_distance * 3 +
current_keyframe_distance) / 4;
else
dash_stream->first_sync_sample_average_size =
(size + dash_stream->first_sync_sample_average_size * 3) / 4;
dash_stream->keyframe_average_distance =
(dash_stream->keyframe_average_distance +
current_keyframe_distance * 3) / 4;
} else {
dash_stream->first_sync_sample_average_size = size;
dash_stream->keyframe_average_distance = current_keyframe_distance;
}
if (dash_stream->moof_offset + dash_stream->moof_size + 8 <
sync_sample->start_offset) {
dash_stream->first_sync_sample_after_moof = FALSE;
dash_stream->first_sync_sample_always_after_moof = FALSE;
} else {
dash_stream->first_sync_sample_after_moof =
(dash_stream->moof_sync_samples->len == 1
|| demux->segment.rate > 0.0);
}
GST_DEBUG_OBJECT (stream->pad,
"average keyframe sample size: %" G_GUINT64_FORMAT,
dash_stream->keyframe_average_size);
GST_DEBUG_OBJECT (stream->pad,
"average keyframe distance: %" GST_TIME_FORMAT " (%" GST_TIME_FORMAT
")", GST_TIME_ARGS (dash_stream->keyframe_average_distance),
GST_TIME_ARGS (current_keyframe_distance));
GST_DEBUG_OBJECT (stream->pad, "first sync sample after moof: %d",
dash_stream->first_sync_sample_after_moof);
}
return TRUE;

4
ext/dash/gstdashdemux.h
View file

@ -94,7 +94,9 @@ struct _GstDashDemuxStream
GArray *moof_sync_samples;
guint current_sync_sample;
guint64 moof_average_size, first_sync_sample_average_size;
guint64 moof_average_size;
guint64 keyframe_average_size;
guint64 keyframe_average_distance;
gboolean first_sync_sample_after_moof, first_sync_sample_always_after_moof;
};