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matroska: demux: update stream_start_time

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The stream_start_time can be less than the first detected.
In case of B-Frame based media, the first frame PTS might be
greater than the next one.

Need to keep the segment.start if a seek has been performed.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/1030>
This commit is contained in:
Stéphane Cerveau 2021-07-15 12:02:40 +02:00 committed by Nicolas Dufresne
parent 65deef0b0c
commit 508a565163
1 changed files with 14 additions and 4 deletions
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18
gst/matroska/matroska-demux.c
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@ -4611,6 +4611,7 @@ gst_matroska_demux_parse_blockgroup_or_simpleblock (GstMatroskaDemux * demux,
gboolean delta_unit = FALSE;
guint64 duration = 0;
gint64 lace_time = 0;
gboolean keep_seek_start = TRUE;
GstEvent *protect_event;
stream = g_ptr_array_index (demux->common.src, stream_num);
@ -4639,6 +4640,15 @@ gst_matroska_demux_parse_blockgroup_or_simpleblock (GstMatroskaDemux * demux,
}
/* need to refresh segment info ASAP */
if (GST_CLOCK_TIME_IS_VALID (lace_time)
&& GST_CLOCK_TIME_IS_VALID (demux->stream_start_time)
&& lace_time < demux->stream_start_time) {
keep_seek_start =
(demux->common.segment.start > demux->stream_start_time);
demux->stream_start_time = lace_time;
demux->need_segment = TRUE;
}
if (GST_CLOCK_TIME_IS_VALID (lace_time) && demux->need_segment) {
GstSegment *segment = &demux->common.segment;
guint64 clace_time;
@ -4651,10 +4661,10 @@ gst_matroska_demux_parse_blockgroup_or_simpleblock (GstMatroskaDemux * demux,
GST_TIME_ARGS (lace_time));
}
clace_time = MAX (lace_time, demux->stream_start_time);
if (GST_CLOCK_TIME_IS_VALID (demux->common.segment.position) &&
demux->common.segment.position != 0) {
GST_DEBUG_OBJECT (demux,
"using stored seek position %" GST_TIME_FORMAT,
if (keep_seek_start
&& GST_CLOCK_TIME_IS_VALID (demux->common.segment.position)
&& demux->common.segment.position != 0) {
GST_DEBUG_OBJECT (demux, "using stored seek position %" GST_TIME_FORMAT,
GST_TIME_ARGS (demux->common.segment.position));
clace_time = demux->common.segment.position;
}