[Cast] Clean-up: Merge RtpReceiver+AudioReceiver+VideoReceiver-->FrameReceiver.

media/cast/audio_receiver/audio_decoder.h

-// Copyright 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef MEDIA_CAST_AUDIO_RECEIVER_AUDIO_DECODER_H_
-#define MEDIA_CAST_AUDIO_RECEIVER_AUDIO_DECODER_H_
-
-#include "base/callback.h"
-#include "base/memory/ref_counted.h"
-#include "media/base/audio_bus.h"
-#include "media/cast/cast_config.h"
-#include "media/cast/cast_environment.h"
-#include "media/cast/transport/cast_transport_config.h"
-
-namespace media {
-namespace cast {
-
-class AudioDecoder {
- public:
-  // Callback passed to DecodeFrame, to deliver decoded audio data from the
-  // decoder.  The number of samples in |audio_bus| may vary, and |audio_bus|
-  // can be NULL when errors occur.  |is_continuous| is normally true, but will
-  // be false if the decoder has detected a frame skip since the last decode
-  // operation; and the client should take steps to smooth audio discontinuities
-  // in this case.
-  typedef base::Callback<void(scoped_ptr<AudioBus> audio_bus,
-                              bool is_continuous)> DecodeFrameCallback;
-
-  AudioDecoder(const scoped_refptr<CastEnvironment>& cast_environment,
-               const FrameReceiverConfig& audio_config);
-  virtual ~AudioDecoder();
-
-  // Returns STATUS_AUDIO_INITIALIZED if the decoder was successfully
-  // constructed from the given FrameReceiverConfig.  If this method returns any
-  // other value, calls to DecodeFrame() will not succeed.
-  CastInitializationStatus InitializationResult() const;
-
-  // Decode the payload in |encoded_frame| asynchronously.  |callback| will be
-  // invoked on the CastEnvironment::MAIN thread with the result.
-  //
-  // In the normal case, |encoded_frame->frame_id| will be
-  // monotonically-increasing by 1 for each successive call to this method.
-  // When it is not, the decoder will assume one or more frames have been
-  // dropped (e.g., due to packet loss), and will perform recovery actions.
-  void DecodeFrame(scoped_ptr<transport::EncodedFrame> encoded_frame,
-                   const DecodeFrameCallback& callback);
-
- private:
-  class ImplBase;
-  class OpusImpl;
-  class Pcm16Impl;
-
-  const scoped_refptr<CastEnvironment> cast_environment_;
-  scoped_refptr<ImplBase> impl_;
-
-  DISALLOW_COPY_AND_ASSIGN(AudioDecoder);
-};
-
-}  // namespace cast
-}  // namespace media
-
-#endif  // MEDIA_CAST_AUDIO_RECEIVER_AUDIO_DECODER_H_