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qtdemux: Do not send unnecessary GAP events

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Each stream may have its own segment timeline
(i.g., different segment.start or segment.base)
depending on edit-list and composition-to-decode atom.

Make sure whether time position of a stream has been actually
far behind than that of current target stream.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1352>
This commit is contained in:
Seungha Yang 2021-11-16 17:35:25 +09:00 committed by GStreamer Marge Bot
parent 97720dabe0
commit 53ed876002
1 changed files with 33 additions and 9 deletions
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42
subprojects/gst-plugins-good/gst/isomp4/qtdemux.c
View file

@ -6373,11 +6373,37 @@ gst_qtdemux_loop_state_movie (GstQTDemux * qtdemux)
goto eos_stream;
}
/* gap events for subtitle streams */
for (i = 0; i < QTDEMUX_N_STREAMS (qtdemux); i++) {
/* fetch info for the current sample of this stream */
if (G_UNLIKELY (!gst_qtdemux_prepare_current_sample (qtdemux, target_stream,
&empty, &offset, &sample_size, &dts, &pts, &duration, &keyframe)))
goto eos_stream;
/* Send catche-up GAP event for each other stream if required.
* This logic will be applied only for positive rate */
for (i = 0; i < QTDEMUX_N_STREAMS (qtdemux) &&
qtdemux->segment.rate >= 0; i++) {
stream = QTDEMUX_NTH_STREAM (qtdemux, i);
if (stream == target_stream ||
!GST_CLOCK_TIME_IS_VALID (stream->segment.stop) ||
!GST_CLOCK_TIME_IS_VALID (stream->segment.position))
continue;
if (stream->pad) {
GstClockTime gap_threshold;
/* kind of running time with offset segment.base and segment.start */
GstClockTime pseudo_target_time = target_stream->segment.base;
GstClockTime pseudo_cur_time = stream->segment.base;
/* make sure positive offset, segment.position can be smallr than
* segment.start for some reasons */
if (target_stream->segment.position >= target_stream->segment.start) {
pseudo_target_time +=
(target_stream->segment.position - target_stream->segment.start);
}
if (stream->segment.position >= stream->segment.start)
pseudo_cur_time += (stream->segment.position - stream->segment.start);
/* Only send gap events on non-subtitle streams if lagging way behind. */
if (stream->subtype == FOURCC_subp
@ -6389,22 +6415,20 @@ gst_qtdemux_loop_state_movie (GstQTDemux * qtdemux)
/* send gap events until the stream catches up */
/* gaps can only be sent after segment is activated (segment.stop is no longer -1) */
while (GST_CLOCK_TIME_IS_VALID (stream->segment.stop) &&
GST_CLOCK_TIME_IS_VALID (stream->segment.position) &&
stream->segment.position + gap_threshold < min_time) {
while (GST_CLOCK_TIME_IS_VALID (stream->segment.position) &&
pseudo_cur_time + gap_threshold < pseudo_target_time) {
GstEvent *gap =
gst_event_new_gap (stream->segment.position, gap_threshold);
GST_LOG_OBJECT (stream->pad, "Sending %" GST_PTR_FORMAT, gap);
gst_pad_push_event (stream->pad, gap);
stream->segment.position += gap_threshold;
pseudo_cur_time += gap_threshold;
}
}
}
stream = target_stream;
/* fetch info for the current sample of this stream */
if (G_UNLIKELY (!gst_qtdemux_prepare_current_sample (qtdemux, stream, &empty,
&offset, &sample_size, &dts, &pts, &duration, &keyframe)))
goto eos_stream;
gst_qtdemux_stream_check_and_change_stsd_index (qtdemux, stream);
if (stream->new_caps) {