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avdemux: Fix deadlock when serialized events are received from upstream while opening

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Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/3657

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/7362>
This commit is contained in:
Sebastian Dröge 2024-08-15 11:42:47 +03:00 committed by GStreamer Marge Bot
parent 132ef7eb11
commit 0db6ce0f11
1 changed files with 10 additions and 4 deletions
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14
subprojects/gst-libav/ext/libav/gstavdemux.c
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@ -67,6 +67,8 @@ struct _GstFFMpegDemux
guint group_id;
AVFormatContext *context;
/* set while avformat_open_input() is called */
gboolean opening;
GstFFStream *streams[MAX_STREAMS];
@ -463,7 +465,7 @@ gst_ffmpegdemux_do_seek (GstFFMpegDemux * demux, GstSegment * segment)
GST_LOG_OBJECT (demux, "do seek to time %" GST_TIME_FORMAT,
GST_TIME_ARGS (target));
/* if we need to land on a keyframe, try to do so, we don't try to do a
/* if we need to land on a keyframe, try to do so, we don't try to do a
* keyframe seek if we are not absolutely sure we have an index.*/
if (segment->flags & GST_SEEK_FLAG_KEY_UNIT) {
gint keyframeidx;
@ -1261,7 +1263,9 @@ gst_ffmpegdemux_open (GstFFMpegDemux * demux)
demux->context = avformat_alloc_context ();
demux->context->pb = iocontext;
demux->opening = TRUE;
res = avformat_open_input (&demux->context, uri, oclass->in_plugin, NULL);
demux->opening = FALSE;
g_free (uri);
@ -1724,10 +1728,12 @@ gst_ffmpegdemux_sink_event (GstPad * sinkpad, GstObject * parent,
/* for a serialized event, wait until an earlier data is gone,
* though this is no guarantee as to when task is done with it.
*
* If the demuxer isn't opened, push straight away, since we'll
* be waiting against a cond that will never be signalled. */
* If the demuxer isn't opened yet, i.e. this is called as part of opening
* the demuxer, queue up the events for sending them at a later time since
* we'll otherwise be waiting against a cond that will never be signalled.
*/
if (GST_EVENT_IS_SERIALIZED (event)) {
if (demux->context) {
if (demux->context && !demux->opening) {
GST_FFMPEG_PIPE_MUTEX_LOCK (ffpipe);
while (!ffpipe->needed)
GST_FFMPEG_PIPE_WAIT (ffpipe);