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mftransform: Fix deadlock when MFT requests processing output twice

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This sequence of event/data flow might happen

1) Initially we have one pending output event
  1-1) Then, process the pending output data
2) No pending input event, then we should wait new pending input event
  2-1) Wakeup by new pending event (but it's pending output event)

In above case, MFT will not report new pending input event
if pending output is not processed.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1325>
This commit is contained in:
Seungha Yang 2020-06-08 23:46:43 +09:00
parent 309c679c43
commit 52a82f5b84
1 changed files with 10 additions and 0 deletions
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10
sys/mediafoundation/gstmftransform.cpp
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@ -539,6 +539,8 @@ gst_mf_transform_process_input (GstMFTransform * object,
gst_mf_transform_drain_all_events (object);
if (object->hardware) {
process_output:
/* Process pending output first */
while (object->pending_have_output > 0) {
GST_TRACE_OBJECT (object,
"Pending have output %d", object->pending_have_output);
@ -581,6 +583,14 @@ gst_mf_transform_process_input (GstMFTransform * object,
GST_DEBUG_OBJECT (object, "Unhandled event %d", type);
break;
}
/* If MFT doesn't want to handle input yet but we have pending output,
* process output again */
if (object->pending_have_output > 0 && object->pending_need_input == 0) {
GST_TRACE_OBJECT (object,
"Only have pending output, process output again");
goto process_output;
}
}
}