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matroska-demux: send GAP events for lagging audio and video streams too

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Send GAP events for non-subtitle streams too if they lag too much
behind, but use a higher threshold than for subtitles.

This helps with fixing prerolling with a file where one of the
audio streams only has data starting from 19s onwards. It's not
a complete fix yet, it also requires changes elsewhere, such as
in baseparse, to make sure caps are propagated.

https://bugzilla.gnome.org/show_bug.cgi?id=614460
https://bugzilla.gnome.org/show_bug.cgi?id=753899
This commit is contained in:
Tim-Philipp Müller 2015-08-21 14:15:18 +01:00
parent 5faa9c11a6
commit 77403d0afe
1 changed files with 10 additions and 8 deletions
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18
gst/matroska/matroska-demux.c
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@ -2584,6 +2584,7 @@ gst_matroska_ebmlnum_sint (guint8 * data, guint size, gint64 * num)
static void
gst_matroska_demux_sync_streams (GstMatroskaDemux * demux)
{
GstClockTime gap_threshold;
gint stream_nr;
GST_OBJECT_LOCK (demux);
@ -2601,21 +2602,22 @@ gst_matroska_demux_sync_streams (GstMatroskaDemux * demux)
"Checking for resync on stream %d (%" GST_TIME_FORMAT ")", stream_nr,
GST_TIME_ARGS (context->pos));
if (G_LIKELY (context->type != GST_MATROSKA_TRACK_TYPE_SUBTITLE)) {
GST_LOG_OBJECT (demux, "Skipping sync on non-subtitle stream");
continue;
}
/* Only send gap events on non-subtitle streams if lagging way behind.
* The 0.5 second threshold for subtitle streams is also quite random. */
if (context->type == GST_MATROSKA_TRACK_TYPE_SUBTITLE)
gap_threshold = GST_SECOND / 2;
else
gap_threshold = 3 * GST_SECOND;
/* does it lag? 0.5 seconds is a random threshold...
* lag need only be considered if we have advanced into requested segment */
/* Lag need only be considered if we have advanced into requested segment */
if (GST_CLOCK_TIME_IS_VALID (context->pos) &&
GST_CLOCK_TIME_IS_VALID (demux->common.segment.position) &&
demux->common.segment.position > demux->common.segment.start &&
context->pos + (GST_SECOND / 2) < demux->common.segment.position) {
context->pos + gap_threshold < demux->common.segment.position) {
GstEvent *event;
guint64 start = context->pos;
guint64 stop = demux->common.segment.position - (GST_SECOND / 2);
guint64 stop = demux->common.segment.position - gap_threshold;
GST_DEBUG_OBJECT (demux,
"Synchronizing stream %d with other by advancing time from %"