Bug 1271508. Part 1 - refactor FFmpegAudioDecoder code to be similar to FFmpegVideoDecoder::Input() so it would be easier to extract common code to the parent class. r=jya.

MozReview-Commit-ID: 4IXZz50qrWm

dom/media/platforms/ffmpeg/FFmpegAudioDecoder.cpp

@@ -96,8 +96,8 @@ CopyAndPackAudio(AVFrame* aFrame, uint32_t aNumChannels, uint32_t aNumAFrames)
   return audio;
 }
 
-void
+FFmpegAudioDecoder<LIBAV_VER>::DecodeResult
-FFmpegAudioDecoder<LIBAV_VER>::DecodePacket(MediaRawData* aSample)
+FFmpegAudioDecoder<LIBAV_VER>::DoDecode(MediaRawData* aSample)
 {
   MOZ_ASSERT(mTaskQueue->IsCurrentThreadIn());
   AVPacket packet;
@@ -109,7 +109,7 @@ FFmpegAudioDecoder<LIBAV_VER>::DecodePacket(MediaRawData* aSample)
   if (!PrepareFrame()) {
     NS_WARNING("FFmpeg audio decoder failed to allocate frame.");
     mCallback->Error();
-    return;
+    return DecodeResult::DECODE_ERROR;
   }
 
   int64_t samplePosition = aSample->mOffset;
@@ -123,7 +123,7 @@ FFmpegAudioDecoder<LIBAV_VER>::DecodePacket(MediaRawData* aSample)
     if (bytesConsumed < 0) {
       NS_WARNING("FFmpeg audio decoder error.");
       mCallback->Error();
-      return;
+      return DecodeResult::DECODE_ERROR;
     }
 
     if (decoded) {
@@ -131,7 +131,7 @@ FFmpegAudioDecoder<LIBAV_VER>::DecodePacket(MediaRawData* aSample)
       AudioConfig::ChannelLayout layout(numChannels);
       if (!layout.IsValid()) {
         mCallback->Error();
-        return;
+        return DecodeResult::DECODE_ERROR;
       }
 
       uint32_t samplingRate = mCodecContext->sample_rate;
@@ -144,7 +144,7 @@ FFmpegAudioDecoder<LIBAV_VER>::DecodePacket(MediaRawData* aSample)
       if (!audio || !duration.IsValid()) {
         NS_WARNING("Invalid count of accumulated audio samples");
         mCallback->Error();
-        return;
+        return DecodeResult::DECODE_ERROR;
       }
 
       RefPtr<AudioData> data = new AudioData(samplePosition,
@@ -159,7 +159,7 @@ FFmpegAudioDecoder<LIBAV_VER>::DecodePacket(MediaRawData* aSample)
       if (!pts.IsValid()) {
         NS_WARNING("Invalid count of accumulated audio samples");
         mCallback->Error();
-        return;
+        return DecodeResult::DECODE_ERROR;
       }
     }
     packet.data += bytesConsumed;
@@ -167,7 +167,14 @@ FFmpegAudioDecoder<LIBAV_VER>::DecodePacket(MediaRawData* aSample)
     samplePosition += bytesConsumed;
   }
 
-  if (mTaskQueue->IsEmpty()) {
+  return DecodeResult::DECODE_FRAME;
+}
+
+void
+FFmpegAudioDecoder<LIBAV_VER>::ProcessDecode(MediaRawData* aSample)
+{
+  MOZ_ASSERT(mTaskQueue->IsCurrentThreadIn());
+  if (DoDecode(aSample) != DecodeResult::DECODE_ERROR && mTaskQueue->IsEmpty()) {
     mCallback->InputExhausted();
   }
 }
@@ -175,9 +182,8 @@ FFmpegAudioDecoder<LIBAV_VER>::DecodePacket(MediaRawData* aSample)
 nsresult
 FFmpegAudioDecoder<LIBAV_VER>::Input(MediaRawData* aSample)
 {
-  nsCOMPtr<nsIRunnable> runnable(NewRunnableMethod<RefPtr<MediaRawData>>(
+  mTaskQueue->Dispatch(NewRunnableMethod<RefPtr<MediaRawData>>(
-    this, &FFmpegAudioDecoder::DecodePacket, RefPtr<MediaRawData>(aSample)));
+    this, &FFmpegAudioDecoder::ProcessDecode, aSample));
-  mTaskQueue->Dispatch(runnable.forget());
   return NS_OK;
 }
 

dom/media/platforms/ffmpeg/FFmpegAudioDecoder.h

@@ -20,6 +20,12 @@ template <int V> class FFmpegAudioDecoder
 template <>
 class FFmpegAudioDecoder<LIBAV_VER> : public FFmpegDataDecoder<LIBAV_VER>
 {
+  enum DecodeResult {
+    DECODE_FRAME,
+    DECODE_NO_FRAME,
+    DECODE_ERROR
+  };
+
 public:
   FFmpegAudioDecoder(FFmpegLibWrapper* aLib, FlushableTaskQueue* aTaskQueue,
                      MediaDataDecoderCallback* aCallback,
@@ -37,7 +43,8 @@ public:
   }
 
 private:
-  void DecodePacket(MediaRawData* aSample);
+  void ProcessDecode(MediaRawData* aSample);
+  DecodeResult DoDecode(MediaRawData* aSample);
 };
 
 } // namespace mozilla