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gst-libav: Fix synchronization issues and errors created by the forwarding of

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segment events by demuxer.

In order to play nicely with `ffmpeg`, demuxers in `gst-libav` have to make
buffers available to `ffmpeg` while taking the blocking I/O model in `ffmpeg`
into account, which results in buffers not being sent downstream until `ffmpeg`
has processed them in its separate thread.

In constrast, many `gstreamer` events are simply forwarded downstream.
Currently `GST_EVENT_SEGMENT` events are forwarded downstream without any
processing, which can potentially result in:
 * `GST_EVENT_SEGMENT` events being out of sync with buffers
 * `GST_EVENT_SEGMENT` events going out that are incorrect because they apply
   to data seen by the demuxer, but not necessarily seen by downstream elements

I came across this bug when I was attempting to enable G723.1 demuxing/decoding
using the G723.1 demuxer and decoder provided by `ffmpeg`.  I wrote tests to
verify support for the functionality, and found that, in push mode,
`GST_EVENT_SEGMENT` events pushed to the demuxer by the upstream `filesrc`
element would be forwarded to the decoder without modification, resulting in
an internal data streaming error.  With this patch, tests work in both push and
pull mode.

This patch solves the problem by disabling the forwarding of
`GST_EVENT_SEGMENT` events downstream (an initial `GST_EVENT_SEGMENT` event is
still pushed downstream by the demuxer).  It's possible there's a better way to
do this, but, having looked at how a few different `gstreamer` demuxers deal
with `GST_EVENT_SEGMENT` events, it seems like the processing is somewhat
specific to the demuxer implementation, whereas `gst-libav` has one general way
of handling the situation for any `ffmpeg` demuxer.  Perhaps there's a better
way to solve this using the `ffmpeg` API to take advantage of specific demuxer
details.  IDK.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3218>
This commit is contained in:
Devin Anderson 2022-10-18 11:37:30 +00:00 committed by GStreamer Marge Bot
parent 7bc5ed34fd
commit 0812c753c6
1 changed files with 7 additions and 4 deletions
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11
subprojects/gst-libav/ext/libav/gstavdemux.c
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@ -1104,10 +1104,12 @@ static const struct
"artist", GST_TAG_ARTIST}, {
"comment", GST_TAG_COMMENT}, {
"composer", GST_TAG_COMPOSER}, {
"copyright", GST_TAG_COPYRIGHT}, {
/* Need to convert ISO 8601 to GstDateTime: */
"creation_time", GST_TAG_DATE_TIME}, {
/* Need to convert ISO 8601 to GDateTime: */
"copyright", GST_TAG_COPYRIGHT},
/* Need to convert ISO 8601 to GstDateTime: */
{
"creation_time", GST_TAG_DATE_TIME},
/* Need to convert ISO 8601 to GDateTime: */
{
"date", GST_TAG_DATE_TIME}, {
"disc", GST_TAG_ALBUM_VOLUME_NUMBER}, {
"encoder", GST_TAG_ENCODER}, {
@ -1738,6 +1740,7 @@ gst_ffmpegdemux_sink_event (GstPad * sinkpad, GstObject * parent,
goto done;
case GST_EVENT_STREAM_START:
case GST_EVENT_CAPS:
case GST_EVENT_SEGMENT:
GST_LOG_OBJECT (demux, "dropping %s event", GST_EVENT_TYPE_NAME (event));
gst_event_unref (event);
goto done;