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plugins: encode: fix a deadlock because of _drain()

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We call gst_vaapiencode_drain() in gst_vaapiencode_change_state(),
whose context does not hold the stream lock of the encoder. The
current gst_vaapiencode_drain inside unlock/lock pair adds a extra
lock count to the stream lock of encoder and causes hang later.
We just remove the gst_vaapiencode_drain() and expand its logic
correctly according to the lock/unlock context.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-vaapi/-/merge_requests/433>
This commit is contained in:
He Junyan 2021-06-23 16:23:00 +08:00 committed by GStreamer Marge Bot
parent d152ab1d37
commit 677d1e0105
1 changed files with 24 additions and 25 deletions
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49
gst/vaapi/gstvaapiencode.c
View file

@ -557,29 +557,11 @@ set_codec_state (GstVaapiEncode * encode, GstVideoCodecState * state)
return TRUE;
}
static gboolean
gst_vaapiencode_drain (GstVaapiEncode * encode)
{
GstVaapiEncoderStatus status;
if (!encode->encoder)
return TRUE;
GST_VIDEO_ENCODER_STREAM_UNLOCK (encode);
status = gst_vaapi_encoder_flush (encode->encoder);
GST_VIDEO_ENCODER_STREAM_LOCK (encode);
if (status != GST_VAAPI_ENCODER_STATUS_SUCCESS)
return FALSE;
gst_vaapiencode_purge (encode);
return TRUE;
}
static gboolean
gst_vaapiencode_set_format (GstVideoEncoder * venc, GstVideoCodecState * state)
{
GstVaapiEncode *const encode = GST_VAAPIENCODE_CAST (venc);
GstVaapiEncoderStatus status;
g_return_val_if_fail (state->caps != NULL, FALSE);
@ -590,9 +572,14 @@ gst_vaapiencode_set_format (GstVideoEncoder * venc, GstVideoCodecState * state)
state->caps, NULL))
return FALSE;
if (!gst_vaapiencode_drain (encode))
GST_VIDEO_ENCODER_STREAM_UNLOCK (encode);
status = gst_vaapi_encoder_flush (encode->encoder);
GST_VIDEO_ENCODER_STREAM_LOCK (encode);
if (status != GST_VAAPI_ENCODER_STATUS_SUCCESS)
return FALSE;
gst_vaapiencode_purge (encode);
if (encode->input_state)
gst_video_codec_state_unref (encode->input_state);
encode->input_state = gst_video_codec_state_ref (state);
@ -745,13 +732,19 @@ static GstStateChangeReturn
gst_vaapiencode_change_state (GstElement * element, GstStateChange transition)
{
GstVaapiEncode *const encode = GST_VAAPIENCODE_CAST (element);
GstVaapiEncoderStatus status;
switch (transition) {
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_pad_stop_task (GST_VAAPI_PLUGIN_BASE_SRC_PAD (encode));
if (!gst_vaapiencode_drain (encode))
goto drain_error;
status = gst_vaapi_encoder_flush (encode->encoder);
if (status != GST_VAAPI_ENCODER_STATUS_SUCCESS)
goto flush_error;
GST_VIDEO_ENCODER_STREAM_LOCK (encode);
gst_vaapiencode_purge (encode);
GST_VIDEO_ENCODER_STREAM_UNLOCK (encode);
break;
default:
break;
@ -760,9 +753,9 @@ gst_vaapiencode_change_state (GstElement * element, GstStateChange transition)
GST_ELEMENT_CLASS (gst_vaapiencode_parent_class)->change_state (element,
transition);
drain_error:
flush_error:
{
GST_ERROR ("failed to drain pending encoded frames");
GST_ERROR ("failed to flush pending encoded frames");
return GST_STATE_CHANGE_FAILURE;
}
}
@ -808,15 +801,21 @@ static gboolean
gst_vaapiencode_flush (GstVideoEncoder * venc)
{
GstVaapiEncode *const encode = GST_VAAPIENCODE_CAST (venc);
GstVaapiEncoderStatus status;
if (!encode->encoder)
return FALSE;
GST_LOG_OBJECT (encode, "flushing");
if (!gst_vaapiencode_drain (encode))
GST_VIDEO_ENCODER_STREAM_UNLOCK (encode);
status = gst_vaapi_encoder_flush (encode->encoder);
GST_VIDEO_ENCODER_STREAM_LOCK (encode);
if (status != GST_VAAPI_ENCODER_STATUS_SUCCESS)
return FALSE;
gst_vaapiencode_purge (encode);
gst_vaapi_encoder_replace (&encode->encoder, NULL);
if (!ensure_encoder (encode))
return FALSE;