1 files changed, 147 insertions, 0 deletions
diff --git a/dom/media/platforms/wmf/WMFMediaDataDecoder.h b/dom/media/platforms/wmf/WMFMediaDataDecoder.h
new file mode 100644
index 000000000..a4dd49f56
--- /dev/null
+++ b/dom/media/platforms/wmf/WMFMediaDataDecoder.h
@@ -0,0 +1,147 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#if !defined(WMFMediaDataDecoder_h_)
+#define WMFMediaDataDecoder_h_
+
+
+#include "WMF.h"
+#include "MFTDecoder.h"
+#include "mozilla/RefPtr.h"
+#include "nsAutoPtr.h"
+#include "PlatformDecoderModule.h"
+
+namespace mozilla {
+
+// Encapsulates the initialization of the MFTDecoder appropriate for decoding
+// a given stream, and the process of converting the IMFSample produced
+// by the MFT into a MediaData object.
+class MFTManager {
+public:
+  virtual ~MFTManager() {}
+
+  // Submit a compressed sample for decoding.
+  // This should forward to the MFTDecoder after performing
+  // any required sample formatting.
+  virtual HRESULT Input(MediaRawData* aSample) = 0;
+
+  // Produces decoded output, if possible. Blocks until output can be produced,
+  // or until no more is able to be produced.
+  // Returns S_OK on success, or MF_E_TRANSFORM_NEED_MORE_INPUT if there's not
+  // enough data to produce more output. If this returns a failure code other
+  // than MF_E_TRANSFORM_NEED_MORE_INPUT, an error will be reported to the
+  // MP4Reader.
+  virtual HRESULT Output(int64_t aStreamOffset,
+                         RefPtr<MediaData>& aOutput) = 0;
+
+  virtual void Flush()
+  {
+    mDecoder->Flush();
+    mSeekTargetThreshold.reset();
+  }
+
+  virtual void Drain()
+  {
+    if (FAILED(mDecoder->SendMFTMessage(MFT_MESSAGE_COMMAND_DRAIN, 0))) {
+      NS_WARNING("Failed to send DRAIN command to MFT");
+    }
+  }
+
+  // Destroys all resources.
+  virtual void Shutdown() = 0;
+
+  virtual bool IsHardwareAccelerated(nsACString& aFailureReason) const { return false; }
+
+  virtual TrackInfo::TrackType GetType() = 0;
+
+  virtual const char* GetDescriptionName() const = 0;
+
+  virtual void SetSeekThreshold(const media::TimeUnit& aTime) {
+    mSeekTargetThreshold = Some(aTime);
+  }
+
+protected:
+  // IMFTransform wrapper that performs the decoding.
+  RefPtr<MFTDecoder> mDecoder;
+
+  Maybe<media::TimeUnit> mSeekTargetThreshold;
+};
+
+// Decodes audio and video using Windows Media Foundation. Samples are decoded
+// using the MFTDecoder created by the MFTManager. This class implements
+// the higher-level logic that drives mapping the MFT to the async
+// MediaDataDecoder interface. The specifics of decoding the exact stream
+// type are handled by MFTManager and the MFTDecoder it creates.
+class WMFMediaDataDecoder : public MediaDataDecoder {
+public:
+  WMFMediaDataDecoder(MFTManager* aOutputSource,
+                      TaskQueue* aTaskQueue,
+                      MediaDataDecoderCallback* aCallback);
+  ~WMFMediaDataDecoder();
+
+  RefPtr<MediaDataDecoder::InitPromise> Init() override;
+
+  void Input(MediaRawData* aSample);
+
+  void Flush() override;
+
+  void Drain() override;
+
+  void Shutdown() override;
+
+  bool IsHardwareAccelerated(nsACString& aFailureReason) const override;
+
+  const char* GetDescriptionName() const override
+  {
+    return mMFTManager ? mMFTManager->GetDescriptionName() : "";
+  }
+
+  virtual void SetSeekThreshold(const media::TimeUnit& aTime) override;
+
+private:
+
+  // Called on the task queue. Inserts the sample into the decoder, and
+  // extracts output if available.
+  void ProcessDecode(MediaRawData* aSample);
+
+  // Called on the task queue. Extracts output if available, and delivers
+  // it to the reader. Called after ProcessDecode() and ProcessDrain().
+  void ProcessOutput();
+
+  // Called on the task queue. Orders the MFT to flush.  There is no output to
+  // extract.
+  void ProcessFlush();
+
+  // Called on the task queue. Orders the MFT to drain, and then extracts
+  // all available output.
+  void ProcessDrain();
+
+  void ProcessShutdown();
+
+  const RefPtr<TaskQueue> mTaskQueue;
+  MediaDataDecoderCallback* mCallback;
+
+  nsAutoPtr<MFTManager> mMFTManager;
+
+  // The last offset into the media resource that was passed into Input().
+  // This is used to approximate the decoder's position in the media resource.
+  int64_t mLastStreamOffset;
+
+  // Set on reader/decode thread calling Flush() to indicate that output is
+  // not required and so input samples on mTaskQueue need not be processed.
+  // Cleared on mTaskQueue.
+  Atomic<bool> mIsFlushing;
+
+  bool mIsShutDown;
+
+  // For telemetry
+  bool mHasSuccessfulOutput = false;
+  bool mRecordedError = false;
+};
+
+} // namespace mozilla
+
+#endif // WMFMediaDataDecoder_h_