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matroska-demux: Send instant-rate-change event if requested in the SEEK event

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Short-circuit instant rate change events by generating
a downstream instant-rate-change event and doing no further
seek processing.
This commit is contained in:
Sebastian Dröge 2018-05-15 18:26:16 +03:00 committed by Seungha Yang
parent cb8c83e799
commit 5d0657d4ae
1 changed files with 65 additions and 8 deletions
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73
gst/matroska/matroska-demux.c
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@ -2730,7 +2730,8 @@ gst_matroska_demux_handle_seek_event (GstMatroskaDemux * demux,
GstSeekFlags flags;
GstSeekType cur_type, stop_type;
GstFormat format;
gboolean flush, keyunit, before, after, accurate, snap_next;
gboolean flush, keyunit, instant_rate_change, before, after, accurate,
snap_next;
gdouble rate;
gint64 cur, stop;
GstMatroskaTrackContext *track = NULL;
@ -2758,6 +2759,40 @@ gst_matroska_demux_handle_seek_event (GstMatroskaDemux * demux,
return FALSE;
}
GST_DEBUG_OBJECT (demux, "configuring seek");
flush = ! !(flags & GST_SEEK_FLAG_FLUSH);
keyunit = ! !(flags & GST_SEEK_FLAG_KEY_UNIT);
after = ! !(flags & GST_SEEK_FLAG_SNAP_AFTER);
before = ! !(flags & GST_SEEK_FLAG_SNAP_BEFORE);
accurate = ! !(flags & GST_SEEK_FLAG_ACCURATE);
instant_rate_change = ! !(flags & GST_SEEK_FLAG_INSTANT_RATE_CHANGE);
/* Directly send the instant-rate-change event here before taking the
* stream-lock so that it can be applied as soon as possible */
if (instant_rate_change) {
GstEvent *ev;
/* instant rate change only supported if direction does not change. All
* other requirements are already checked before creating the seek event
* but let's double-check here to be sure */
if ((rate > 0 && demux->common.segment.rate < 0) ||
(rate < 0 && demux->common.segment.rate > 0) ||
cur_type != GST_SEEK_TYPE_NONE ||
stop_type != GST_SEEK_TYPE_NONE || flush) {
GST_ERROR_OBJECT (demux,
"Instant rate change seeks only supported in the "
"same direction, without flushing and position change");
return FALSE;
}
ev = gst_event_new_instant_rate_change (rate /
demux->common.segment.rate, (GstSegmentFlags) flags);
gst_event_set_seqnum (ev, seqnum);
gst_matroska_demux_send_event (demux, ev);
return TRUE;
}
/* copy segment, we need this because we still need the old
* segment when we close the current segment. */
memcpy (&seeksegment, &demux->common.segment, sizeof (GstSegment));
@ -2770,7 +2805,6 @@ gst_matroska_demux_handle_seek_event (GstMatroskaDemux * demux,
seeksegment.duration = GST_CLOCK_TIME_NONE;
}
GST_DEBUG_OBJECT (demux, "configuring seek");
/* Subtract stream_start_time so we always seek on a segment
* in stream time */
if (GST_CLOCK_TIME_IS_VALID (demux->stream_start_time)) {
@ -2799,12 +2833,6 @@ gst_matroska_demux_handle_seek_event (GstMatroskaDemux * demux,
* would be determined again when parsing, but anyway ... */
seeksegment.duration = demux->common.segment.duration;
flush = ! !(flags & GST_SEEK_FLAG_FLUSH);
keyunit = ! !(flags & GST_SEEK_FLAG_KEY_UNIT);
after = ! !(flags & GST_SEEK_FLAG_SNAP_AFTER);
before = ! !(flags & GST_SEEK_FLAG_SNAP_BEFORE);
accurate = ! !(flags & GST_SEEK_FLAG_ACCURATE);
/* always do full update if flushing,
* otherwise problems might arise downstream with missing keyframes etc */
update = update || flush;
@ -3023,6 +3051,35 @@ gst_matroska_demux_handle_seek_push (GstMatroskaDemux * demux, GstPad * pad,
gst_event_parse_seek (event, &rate, &format, &flags, &cur_type, &cur,
&stop_type, &stop);
/* Directly send the instant-rate-change event here before taking the
* stream-lock so that it can be applied as soon as possible */
if (flags & GST_SEEK_FLAG_INSTANT_RATE_CHANGE) {
guint32 seqnum;
GstEvent *ev;
/* instant rate change only supported if direction does not change. All
* other requirements are already checked before creating the seek event
* but let's double-check here to be sure */
if ((rate > 0 && demux->common.segment.rate < 0) ||
(rate < 0 && demux->common.segment.rate > 0) ||
cur_type != GST_SEEK_TYPE_NONE ||
stop_type != GST_SEEK_TYPE_NONE || (flags & GST_SEEK_FLAG_FLUSH)) {
GST_ERROR_OBJECT (demux,
"Instant rate change seeks only supported in the "
"same direction, without flushing and position change");
return FALSE;
}
seqnum = gst_event_get_seqnum (event);
ev = gst_event_new_instant_rate_change (rate / demux->common.segment.rate,
(GstSegmentFlags) flags);
gst_event_set_seqnum (ev, seqnum);
gst_matroska_demux_send_event (demux, ev);
return TRUE;
}
/* sanity checks */
/* we can only seek on time */