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avviddec: Temporarily unlock stream lock while flushing buffers

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This can call into the decoder again from other threads and try to take
the stream lock from there, which would cause a deadlock.

Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/2558

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4610>
This commit is contained in:
Sebastian Dröge 2023-05-12 09:50:04 +03:00 committed by GStreamer Marge Bot
parent e34397ab09
commit 186d8a99cc
1 changed files with 5 additions and 0 deletions
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5
subprojects/gst-libav/ext/libav/gstavviddec.c
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@ -2052,7 +2052,10 @@ gst_ffmpegviddec_drain (GstVideoDecoder * decoder)
do {
got_frame = gst_ffmpegviddec_frame (ffmpegdec, NULL, &ret);
} while (got_frame && ret == GST_FLOW_OK);
GST_VIDEO_DECODER_STREAM_UNLOCK (ffmpegdec);
avcodec_flush_buffers (ffmpegdec->context);
GST_VIDEO_DECODER_STREAM_LOCK (ffmpegdec);
/* FFMpeg will return AVERROR_EOF if it's internal was fully drained
* then we are translating it to GST_FLOW_EOS. However, because this behavior
@ -2265,7 +2268,9 @@ gst_ffmpegviddec_flush (GstVideoDecoder * decoder)
if (ffmpegdec->opened) {
GST_LOG_OBJECT (decoder, "flushing buffers");
GST_VIDEO_DECODER_STREAM_UNLOCK (ffmpegdec);
avcodec_flush_buffers (ffmpegdec->context);
GST_VIDEO_DECODER_STREAM_LOCK (ffmpegdec);
}
return TRUE;