// Copyright 2017 Google Inc. All Rights Reserved.
//
// 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 STARBOARD_SHARED_WIN32_VIDEO_DECODER_THREAD_H_
#define STARBOARD_SHARED_WIN32_VIDEO_DECODER_THREAD_H_

#include <deque>
#include <queue>

#include "starboard/common/ref_counted.h"
#include "starboard/common/semaphore.h"
#include "starboard/media.h"
#include "starboard/shared/internal_only.h"
#include "starboard/shared/starboard/player/decoded_audio_internal.h"
#include "starboard/shared/starboard/player/filter/audio_decoder_internal.h"
#include "starboard/shared/starboard/player/filter/video_decoder_internal.h"
#include "starboard/shared/starboard/player/job_queue.h"
#include "starboard/shared/win32/media_common.h"
#include "starboard/shared/win32/simple_thread.h"
#include "starboard/shared/win32/win32_video_decoder.h"

namespace starboard {
namespace shared {
namespace win32 {

// This class receives decoded video frames.
class VideoDecodedCallback {
 public:
  virtual ~VideoDecodedCallback() {}
  virtual void OnVideoDecoded(VideoFramePtr data) = 0;
};

// This decoder thread simplifies decoding media. Data is pushed in via
// QueueInput() and QueueEndOfStream() and output data is pushed via
// the AudioDecodedCallback.
class VideoDecoderThread : private SimpleThread {
 public:
  VideoDecoderThread(AbstractWin32VideoDecoder* decoder_impl,
                     VideoDecodedCallback* callback);
  ~VideoDecoderThread() SB_OVERRIDE;

  // Returns true if more input can be pushed to this thread.
  bool QueueInput(const scoped_refptr<InputBuffer>& buffer);
  void QueueEndOfStream();

 private:
  void TransferPendingInputTo(std::deque<scoped_refptr<InputBuffer> >* output);
  void Run() SB_OVERRIDE;
  AbstractWin32VideoDecoder* win32_video_decoder_;
  VideoDecodedCallback* callback_;
  std::deque<scoped_refptr<InputBuffer> > input_buffer_queue_;
  ::starboard::Mutex input_buffer_queue_mutex_;
  atomic_int32_t processing_elements_;
  Semaphore semaphore_;
};

}  // namespace win32
}  // namespace shared
}  // namespace starboard

#endif  // STARBOARD_SHARED_WIN32_VIDEO_DECODER_THREAD_H_