Bug 1196417 - Make video software fallback only affect the current video instead of the entire browser. r=cpearce

dom/media/MediaDecoderStateMachine.cpp

@@ -218,7 +218,6 @@ MediaDecoderStateMachine::MediaDecoderStateMachine(MediaDecoder* aDecoder,
   mCurrentTimeBeforeSeek(0),
   mCorruptFrames(30),
   mDecodingFirstFrame(true),
-  mDisabledHardwareAcceleration(false),
   mSentLoadedMetadataEvent(false),
   mSentFirstFrameLoadedEvent(false),
   mSentPlaybackEndedEvent(false),
@@ -2482,14 +2481,13 @@ bool MediaDecoderStateMachine::CheckFrameValidity(VideoData* aData)
     // hardware acceleration. We use 10 as the corrupt value because RollingMean<>
     // only supports integer types.
     mCorruptFrames.insert(10);
-    if (!mDisabledHardwareAcceleration &&
-        mReader->VideoIsHardwareAccelerated() &&
+    if (mReader->VideoIsHardwareAccelerated() &&
         frameStats.GetPresentedFrames() > 30 &&
         mCorruptFrames.mean() >= 1 /* 10% */) {
         nsCOMPtr<nsIRunnable> task =
           NS_NewRunnableMethod(mReader, &MediaDecoderReader::DisableHardwareAcceleration);
         DecodeTaskQueue()->Dispatch(task.forget());
-      mDisabledHardwareAcceleration = true;
+        mCorruptFrames.clear();
       gfxCriticalNote << "Too many dropped/corrupted frames, disabling DXVA";
     }
     return false;

dom/media/MediaDecoderStateMachine.h

@@ -1271,8 +1271,6 @@ private:
   // successeeding.
   bool mDecodingFirstFrame;
 
-  bool mDisabledHardwareAcceleration;
-
   // True if we are back from DECODER_STATE_DORMANT state and
   // LoadedMetadataEvent was already sent.
   bool mSentLoadedMetadataEvent;

dom/media/MediaFormatReader.cpp

@@ -73,6 +73,7 @@ MediaFormatReader::MediaFormatReader(AbstractMediaDecoder* aDecoder,
   , mSeekable(false)
   , mIsEncrypted(false)
   , mTrackDemuxersMayBlock(false)
+  , mHardwareAccelerationDisabled(false)
 {
   MOZ_ASSERT(aDemuxer);
   MOZ_COUNT_CTOR(MediaFormatReader);
@@ -467,8 +468,11 @@ MediaFormatReader::EnsureDecodersCreated()
                    false);
 
     mVideo.mDecoderInitialized = false;
+    // If we've disabled hardware acceleration for this reader, then we can't use
+    // the shared decoder.
     if (mSharedDecoderManager &&
-        mPlatform->SupportsSharedDecoders(mInfo.mVideo)) {
+        mPlatform->SupportsSharedDecoders(mInfo.mVideo) &&
+        !mHardwareAccelerationDisabled) {
       mVideo.mDecoder =
         mSharedDecoderManager->CreateVideoDecoder(mPlatform,
                                                   mVideo.mInfo ?
@@ -479,12 +483,15 @@ MediaFormatReader::EnsureDecodersCreated()
                                                   mVideo.mTaskQueue,
                                                   mVideo.mCallback);
     } else {
+      // Decoders use the layers backend to decide if they can use hardware decoding,
+      // so specify LAYERS_NONE if we want to forcibly disable it.
       mVideo.mDecoder =
         mPlatform->CreateDecoder(mVideo.mInfo ?
                                    *mVideo.mInfo->GetAsVideoInfo() :
                                    mInfo.mVideo,
                                  mVideo.mTaskQueue,
                                  mVideo.mCallback,
+                                 mHardwareAccelerationDisabled ? LayersBackend::LAYERS_NONE :
                                                                  mLayersBackendType,
                                  mDecoder->GetImageContainer());
     }
@@ -590,8 +597,8 @@ void
 MediaFormatReader::DisableHardwareAcceleration()
 {
   MOZ_ASSERT(OnTaskQueue());
-  if (HasVideo()) {
-    mPlatform->DisableHardwareAcceleration();
+  if (HasVideo() && !mHardwareAccelerationDisabled) {
+    mHardwareAccelerationDisabled = true;
     Flush(TrackInfo::kVideoTrack);
     mVideo.mDecoder->Shutdown();
     mVideo.mDecoder = nullptr;

dom/media/MediaFormatReader.h

@@ -399,6 +399,8 @@ private:
   // Set to true if any of our track buffers may be blocking.
   bool mTrackDemuxersMayBlock;
 
+  bool mHardwareAccelerationDisabled;
+
   // Seeking objects.
   bool IsSeeking() const { return mPendingSeekTime.isSome(); }
   void AttemptSeek();

dom/media/platforms/PlatformDecoderModule.h

@@ -110,8 +110,6 @@ public:
   // feeding it to MediaDataDecoder::Input.
   virtual ConversionRequired DecoderNeedsConversion(const TrackInfo& aConfig) const = 0;
 
-  virtual void DisableHardwareAcceleration() {}
-
   virtual bool SupportsSharedDecoders(const VideoInfo& aConfig) const {
     return !AgnosticMimeType(aConfig.mMimeType);
   }

dom/media/platforms/SharedDecoderManager.cpp

@@ -120,13 +120,6 @@ SharedDecoderManager::CreateVideoDecoder(
   return proxy.forget();
 }
 
-void
-SharedDecoderManager::DisableHardwareAcceleration()
-{
-  MOZ_ASSERT(mPDM);
-  mPDM->DisableHardwareAcceleration();
-}
-
 bool
 SharedDecoderManager::Recreate(const VideoInfo& aConfig)
 {

dom/media/platforms/SharedDecoderManager.h

@@ -41,7 +41,6 @@ public:
   friend class SharedDecoderProxy;
   friend class SharedDecoderCallback;
 
-  void DisableHardwareAcceleration();
   bool Recreate(const VideoInfo& aConfig);
 
 private:

dom/media/platforms/wmf/WMFDecoderModule.cpp

@@ -41,13 +41,6 @@ WMFDecoderModule::~WMFDecoderModule()
   }
 }
 
-void
-WMFDecoderModule::DisableHardwareAcceleration()
-{
-  sDXVAEnabled = false;
-  sIsIntelDecoderEnabled = false;
-}
-
 static void
 SetNumOfDecoderThreads()
 {
@@ -133,14 +126,6 @@ WMFDecoderModule::CreateAudioDecoder(const AudioInfo& aConfig,
   return decoder.forget();
 }
 
-bool
-WMFDecoderModule::SupportsSharedDecoders(const VideoInfo& aConfig) const
-{
-  // If DXVA is enabled, but we're not going to use it for this specific config, then
-  // we can't use the shared decoder.
-  return !AgnosticMimeType(aConfig.mMimeType);
-}
-
 bool
 WMFDecoderModule::SupportsMimeType(const nsACString& aMimeType)
 {

dom/media/platforms/wmf/WMFDecoderModule.h

@@ -33,9 +33,6 @@ public:
 
   bool SupportsMimeType(const nsACString& aMimeType) override;
 
-  virtual void DisableHardwareAcceleration() override;
-  virtual bool SupportsSharedDecoders(const VideoInfo& aConfig) const override;
-
   virtual ConversionRequired
   DecoderNeedsConversion(const TrackInfo& aConfig) const override;