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adaptivedemux2: Fix SNAP seek handling

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* Since only flushing seeks are allowed, the "current" position is always the
  global output position (and not "some" stream current position).

* In terms of figuring out to which stream to "snap" to, we can send it to any
  selected stream. Removes the requirement of this function to a specific output
  pad.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2679>
This commit is contained in:
Edward Hervey 2022-05-23 09:11:24 +02:00 committed by GStreamer Marge Bot
parent 5271603852
commit 37b17ba0eb
1 changed files with 21 additions and 42 deletions
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63
subprojects/gst-plugins-good/ext/adaptivedemux2/gstadaptivedemux.c
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@ -1982,31 +1982,6 @@ find_stream_for_track_locked (GstAdaptiveDemux * demux,
return NULL;
}
/* Scheduler context held, takes TRACKS_LOCK */
static GstAdaptiveDemux2Stream *
gst_adaptive_demux_find_stream_for_pad (GstAdaptiveDemux * demux, GstPad * pad)
{
GList *iter;
GstAdaptiveDemuxTrack *track = NULL;
GstAdaptiveDemux2Stream *stream = NULL;
TRACKS_LOCK (demux);
for (iter = demux->output_period->tracks; iter; iter = g_list_next (iter)) {
OutputSlot *cand = iter->data;
if (cand->pad == pad) {
track = cand->track;
break;
}
}
if (track)
stream = find_stream_for_track_locked (demux, track);
TRACKS_UNLOCK (demux);
return stream;
}
/* Called from seek handler
*
* This function is used when a (flushing) seek caused a new period to be activated.
@ -2146,7 +2121,7 @@ gst_adaptive_demux_setup_streams_for_restart (GstAdaptiveDemux * demux,
GST_SEEK_FLAG_SNAP_NEAREST))
static gboolean
gst_adaptive_demux_handle_seek_event (GstAdaptiveDemux * demux, GstPad * pad,
gst_adaptive_demux_handle_seek_event (GstAdaptiveDemux * demux,
GstEvent * event)
{
GstAdaptiveDemuxClass *demux_class = GST_ADAPTIVE_DEMUX_GET_CLASS (demux);
@ -2159,7 +2134,6 @@ gst_adaptive_demux_handle_seek_event (GstAdaptiveDemux * demux, GstPad * pad,
gboolean update;
gboolean ret;
GstSegment oldsegment;
GstAdaptiveDemux2Stream *stream = NULL;
GstEvent *flush_event;
GST_INFO_OBJECT (demux, "Received seek event");
@ -2362,23 +2336,19 @@ gst_adaptive_demux_handle_seek_event (GstAdaptiveDemux * demux, GstPad * pad,
/*
* Handle snap seeks as follows:
* 1) do the snap seeking on the stream that received
* the event
* 1) do the snap seeking a (random) active stream
* 2) use the final position on this stream to seek
* on the other streams to the same position
*
* We can't snap at all streams at the same time as
* they might end in different positions, so just
* use the one that received the event as the 'leading'
* one to do the snap seek.
*
* FIXME: Could use the global_output_position (running time)
* as the snap reference
* We can't snap at all streams at the same time as they might end in
* different positions, so just pick one and align all others to that
* position.
*/
if (IS_SNAP_SEEK (flags) && demux_class->stream_seek && (stream =
gst_adaptive_demux_find_stream_for_pad (demux, pad))) {
if (IS_SNAP_SEEK (flags) && demux_class->stream_seek) {
GstAdaptiveDemux2Stream *stream = NULL;
GstClockTimeDiff ts;
GstSeekFlags stream_seek_flags = flags;
GList *iter;
/* snap-seek on the stream that received the event and then
* use the resulting position to seek on all streams */
@ -2387,7 +2357,8 @@ gst_adaptive_demux_handle_seek_event (GstAdaptiveDemux * demux, GstPad * pad,
if (start_type != GST_SEEK_TYPE_NONE)
ts = start;
else {
ts = stream->current_position;
ts = gst_segment_position_from_running_time (&demux->segment,
GST_FORMAT_TIME, demux->priv->global_output_position);
start_type = GST_SEEK_TYPE_SET;
}
} else {
@ -2395,10 +2366,19 @@ gst_adaptive_demux_handle_seek_event (GstAdaptiveDemux * demux, GstPad * pad,
ts = stop;
else {
stop_type = GST_SEEK_TYPE_SET;
ts = stream->current_position;
ts = gst_segment_position_from_running_time (&demux->segment,
GST_FORMAT_TIME, demux->priv->global_output_position);
}
}
/* Pick a random active stream on which to do the stream seek */
for (iter = demux->output_period->streams; iter; iter = iter->next) {
GstAdaptiveDemux2Stream *cand = iter->data;
if (gst_adaptive_demux2_stream_is_selected_locked (cand)) {
stream = cand;
break;
}
}
if (stream) {
demux_class->stream_seek (stream, rate >= 0, stream_seek_flags, ts, &ts);
}
@ -2415,7 +2395,6 @@ gst_adaptive_demux_handle_seek_event (GstAdaptiveDemux * demux, GstPad * pad,
start_type, start, stop_type, stop);
GST_DEBUG_OBJECT (demux, "Adapted snap seek to %" GST_PTR_FORMAT, event);
}
stream = NULL;
ret = gst_segment_do_seek (&demux->segment, rate, format, flags, start_type,
start, stop_type, stop, &update);
@ -2635,7 +2614,7 @@ gst_adaptive_demux_src_event (GstPad * pad, GstObject * parent,
gst_event_unref (event);
return TRUE;
}
return gst_adaptive_demux_handle_seek_event (demux, pad, event);
return gst_adaptive_demux_handle_seek_event (demux, event);
}
case GST_EVENT_LATENCY:{
/* Upstream and our internal source are irrelevant