Bug 1073792 - Refresh WMF output types on discontinuities, to catch cases where WMF doesn't notify us of an output type change. r=kinetik

content/media/fmp4/wmf/WMFAudioMFTManager.cpp

@@ -256,6 +256,13 @@ WMFAudioMFTManager::Output(int64_t aStreamOffset,
       mAudioFrameOffset = 0;
     }
     mMustRecaptureAudioPosition = false;
+
+    // Also update the output type, in case this segment has a different
+    // rate. This also triggers on the first sample, which can have a
+    // different rate than is advertised in the container, and sometimes
+    // we don't get a MF_E_TRANSFORM_STREAM_CHANGE when the rate changes.
+    hr = UpdateOutputType();
+    NS_ENSURE_TRUE(SUCCEEDED(hr), hr);
   }
   MOZ_ASSERT(numFramesToStrip >= 0);
   int32_t offset = std::min<int32_t>(numFramesToStrip, numFrames);