Backed out changeset 0442a3ecb494 (bug 1400674) for failing mda tests dom/media/mediasource/test/test_BufferingWait_mp4.html and test_WaitingOnMissingData_mp4.html. r=backout

--HG--
extra : amend_source : 260df77d213debe033fef9a110fe665f180e50cc

dom/media/mediasink/AudioSink.cpp

@@ -424,21 +424,28 @@ AudioSink::NotifyAudioNeeded()
       missingFrames = std::min<int64_t>(INT32_MAX, missingFrames.value());
       mFramesParsed += missingFrames.value();
 
-      RefPtr<AudioData> silenceData;
-      AlignedAudioBuffer silenceBuffer(missingFrames.value() * data->mChannels);
-       if (!silenceBuffer) {
-         NS_WARNING("OOM in AudioSink");
-         mErrored = true;
-         return;
-       }
-      if (mConverter->InputConfig() != mConverter->OutputConfig()) {
-        AlignedAudioBuffer convertedData =
-          mConverter->Process(AudioSampleBuffer(Move(silenceBuffer))).Forget();
-        silenceData = CreateAudioFromBuffer(Move(convertedData), data);
-      } else {
-        silenceData = CreateAudioFromBuffer(Move(silenceBuffer), data);
+      // We need to calculate how many frames are missing at the output rate.
+      missingFrames =
+        SaferMultDiv(missingFrames.value(), mOutputRate, data->mRate);
+      if (!missingFrames.isValid()) {
+        NS_WARNING("Int overflow in AudioSink");
+        mErrored = true;
+        return;
+      }
+
+      // We need to insert silence, first use drained frames if any.
+      missingFrames -= DrainConverter(missingFrames.value());
+      // Insert silence if still needed.
+      if (missingFrames.value()) {
+        AlignedAudioBuffer silenceData(missingFrames.value() * mOutputChannels);
+        if (!silenceData) {
+          NS_WARNING("OOM in AudioSink");
+          mErrored = true;
+          return;
+        }
+        RefPtr<AudioData> silence = CreateAudioFromBuffer(Move(silenceData), data);
+        PushProcessedAudio(silence);
       }
-      PushProcessedAudio(silenceData);
     }
 
     mLastEndTime = data->GetEndTime();
@@ -479,7 +486,7 @@ AudioSink::PushProcessedAudio(AudioData* aData)
 
 already_AddRefed<AudioData>
 AudioSink::CreateAudioFromBuffer(AlignedAudioBuffer&& aBuffer,
-                                 AudioData* aReference)
+                                            AudioData* aReference)
 {
   uint32_t frames = aBuffer.Length() / mOutputChannels;
   if (!frames) {