Move core renderer subdirectories to content.

chrome/renderer/media/audio_renderer_impl.h

-// Copyright (c) 2010 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.
-//
-// Audio rendering unit utilizing audio output stream provided by browser
-// process through IPC.
-//
-// Relationship of classes.
-//
-//    AudioRendererHost                AudioRendererImpl
-//           ^                                ^
-//           |                                |
-//           v                 IPC            v
-//   RenderMessageFilter   <---------> AudioMessageFilter
-//
-// Implementation of interface with audio device is in AudioRendererHost and
-// it provides services and entry points in RenderMessageFilter, allowing
-// usage of IPC calls to interact with audio device. AudioMessageFilter acts
-// as a portal for IPC calls and does no more than delegation.
-//
-// Transportation of audio buffer is done by using shared memory, after
-// OnCreateStream is executed, OnCreated would be called along with a
-// SharedMemoryHandle upon successful creation of audio output stream in the
-// browser process. The same piece of shared memory would be used during the
-// lifetime of this unit.
-//
-// This class lives inside three threads during it's lifetime, namely:
-// 1. IO thread.
-//    The thread within which this class receives all the IPC messages and
-//    IPC communications can only happen in this thread.
-// 2. Pipeline thread
-//    Initialization of filter and proper stopping of filters happens here.
-//    Properties of this filter is also set in this thread.
-// 3. Audio decoder thread (If there's one.)
-//    Responsible for decoding audio data and gives raw PCM data to this object.
-
-#ifndef CHROME_RENDERER_MEDIA_AUDIO_RENDERER_IMPL_H_
-#define CHROME_RENDERER_MEDIA_AUDIO_RENDERER_IMPL_H_
-#pragma once
-
-#include "base/gtest_prod_util.h"
-#include "base/message_loop.h"
-#include "base/scoped_ptr.h"
-#include "base/shared_memory.h"
-#include "base/synchronization/lock.h"
-#include "chrome/renderer/audio_message_filter.h"
-#include "media/audio/audio_io.h"
-#include "media/audio/audio_manager.h"
-#include "media/base/filters.h"
-#include "media/filters/audio_renderer_base.h"
-
-class AudioMessageFilter;
-
-class AudioRendererImpl : public media::AudioRendererBase,
-                          public AudioMessageFilter::Delegate,
-                          public MessageLoop::DestructionObserver {
- public:
-  // Methods called on Render thread ------------------------------------------
-  explicit AudioRendererImpl(AudioMessageFilter* filter);
-  virtual ~AudioRendererImpl();
-
-  // Methods called on IO thread ----------------------------------------------
-  // AudioMessageFilter::Delegate methods, called by AudioMessageFilter.
-  virtual void OnRequestPacket(AudioBuffersState buffers_state);
-  virtual void OnStateChanged(const ViewMsg_AudioStreamState_Params& state);
-  virtual void OnCreated(base::SharedMemoryHandle handle, uint32 length);
-  virtual void OnLowLatencyCreated(base::SharedMemoryHandle handle,
-                                   base::SyncSocket::Handle socket_handle,
-                                   uint32 length);
-  virtual void OnVolume(double volume);
-
-  // Methods called on pipeline thread ----------------------------------------
-  // media::Filter implementation.
-  virtual void SetPlaybackRate(float rate);
-  virtual void Pause(media::FilterCallback* callback);
-  virtual void Seek(base::TimeDelta time, media::FilterCallback* callback);
-  virtual void Play(media::FilterCallback* callback);
-
-  // media::AudioRenderer implementation.
-  virtual void SetVolume(float volume);
-
- protected:
-  // Methods called on audio renderer thread ----------------------------------
-  // These methods are called from AudioRendererBase.
-  virtual bool OnInitialize(const media::MediaFormat& media_format);
-  virtual void OnStop();
-
-  // Called when the decoder completes a Read().
-  virtual void ConsumeAudioSamples(scoped_refptr<media::Buffer> buffer_in);
-
- private:
-  // For access to constructor and IO thread methods.
-  friend class AudioRendererImplTest;
-  FRIEND_TEST_ALL_PREFIXES(AudioRendererImplTest, Stop);
-  FRIEND_TEST_ALL_PREFIXES(AudioRendererImplTest,
-                           DestroyedMessageLoop_ConsumeAudioSamples);
-  // Helper methods.
-  // Convert number of bytes to duration of time using information about the
-  // number of channels, sample rate and sample bits.
-  base::TimeDelta ConvertToDuration(int bytes);
-
-  // Methods call on IO thread ------------------------------------------------
-  // The following methods are tasks posted on the IO thread that needs to
-  // be executed on that thread. They interact with AudioMessageFilter and
-  // sends IPC messages on that thread.
-  void CreateStreamTask(const AudioParameters& params);
-  void PlayTask();
-  void PauseTask();
-  void SeekTask();
-  void SetVolumeTask(double volume);
-  void NotifyPacketReadyTask();
-  void DestroyTask();
-
-  // Called on IO thread when message loop is dying.
-  virtual void WillDestroyCurrentMessageLoop();
-
-  // Information about the audio stream.
-  AudioParameters params_;
-  uint32 bytes_per_second_;
-
-  scoped_refptr<AudioMessageFilter> filter_;
-
-  // ID of the stream created in the browser process.
-  int32 stream_id_;
-
-  // Memory shared by the browser process for audio buffer.
-  scoped_ptr<base::SharedMemory> shared_memory_;
-  uint32 shared_memory_size_;
-
-  // Message loop for the IO thread.
-  MessageLoop* io_loop_;
-
-  // Protects:
-  // - |stopped_|
-  // - |pending_request_|
-  // - |request_buffers_state_|
-  base::Lock lock_;
-
-  // A flag that indicates this filter is called to stop.
-  bool stopped_;
-
-  // A flag that indicates an outstanding packet request.
-  bool pending_request_;
-
-  // State of the audio buffers at time of the last request.
-  AudioBuffersState request_buffers_state_;
-
-  // State variables for prerolling.
-  bool prerolling_;
-
-  // Remaining bytes for prerolling to complete.
-  uint32 preroll_bytes_;
-
-  DISALLOW_COPY_AND_ASSIGN(AudioRendererImpl);
-};
-
-#endif  // CHROME_RENDERER_MEDIA_AUDIO_RENDERER_IMPL_H_