/*
 * Copyright 2013, Mozilla Foundation and contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef __VideoDecoder_h__
#define __VideoDecoder_h__

#include <atomic>

#include "gmp-task-utils.h"
#include "gmp-video-decode.h"
#include "gmp-video-host.h"
#include "WMFH264Decoder.h"

#include "mfobjects.h"

class VideoDecoder : public GMPVideoDecoder
                   , public RefCounted
{
public:
  VideoDecoder(GMPVideoHost *aHostAPI);

  virtual void InitDecode(const GMPVideoCodec& aCodecSettings,
                          const uint8_t* aCodecSpecific,
                          uint32_t aCodecSpecificLength,
                          GMPVideoDecoderCallback* aCallback,
                          int32_t aCoreCount) override;

  virtual void Decode(GMPVideoEncodedFrame* aInputFrame,
                      bool aMissingFrames,
                      const uint8_t* aCodecSpecific,
                      uint32_t aCodecSpecificLength,
                      int64_t aRenderTimeMs = -1);

  virtual void Reset() override;

  virtual void Drain() override;

  virtual void DecodingComplete() override;

  bool HasShutdown() { return mHasShutdown; }

private:

  virtual ~VideoDecoder();

  void EnsureWorker();

  void DrainTask();

  struct DecodeData {
    DecodeData()
      : mTimestamp(0)
      , mDuration(0)
      , mIsKeyframe(false)
    {}
    std::vector<uint8_t> mBuffer;
    uint64_t mTimestamp;
    uint64_t mDuration;
    bool mIsKeyframe;
    CryptoMetaData mCrypto;
  };

  void DecodeTask(DecodeData* aData);

  void ResetCompleteTask();

  void ReturnOutput(IMFSample* aSample,
                    int32_t aWidth,
                    int32_t aHeight,
                    int32_t aStride);

  HRESULT SampleToVideoFrame(IMFSample* aSample,
                             int32_t aWidth,
                             int32_t aHeight,
                             int32_t aStride,
                             GMPVideoi420Frame* aVideoFrame);

  void MaybeRunOnMainThread(GMPTask* aTask);

  GMPVideoHost *mHostAPI; // host-owned, invalid at DecodingComplete
  GMPVideoDecoderCallback* mCallback; // host-owned, invalid at DecodingComplete
  GMPThread* mWorkerThread;
  GMPMutex* mMutex;
  wmf::AutoPtr<wmf::WMFH264Decoder> mDecoder;

  std::vector<uint8_t> mExtraData;
  std::vector<uint8_t> mAnnexB;

  int32_t mNumInputTasks;
  bool mSentExtraData;

  std::atomic<bool> mIsFlushing;

  bool mHasShutdown;
};

#endif // __VideoDecoder_h__
