Reland 153623004: Remove the unified IO code on the browser

media/audio/mac/audio_unified_mac.h

-// Copyright (c) 2012 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_AUDIO_MAC_AUDIO_UNIFIED_MAC_H_
-#define MEDIA_AUDIO_MAC_AUDIO_UNIFIED_MAC_H_
-
-#include <CoreAudio/CoreAudio.h>
-
-#include "base/memory/scoped_ptr.h"
-#include "media/audio/audio_io.h"
-#include "media/audio/audio_parameters.h"
-
-namespace media {
-
-class AudioManagerMac;
-
-// Implementation of AudioOutputStream for Mac OS X using the
-// CoreAudio AudioHardware API suitable for low-latency unified audio I/O
-// when using devices which support *both* input and output
-// in the same driver.  This is the case with professional
-// USB and Firewire devices.
-//
-// Please note that it's required to first get the native sample-rate of the
-// default output device and use that sample-rate when creating this object.
-class AudioHardwareUnifiedStream : public AudioOutputStream {
- public:
-  // The ctor takes all the usual parameters, plus |manager| which is the
-  // the audio manager who is creating this object.
-  AudioHardwareUnifiedStream(AudioManagerMac* manager,
-                             const AudioParameters& params);
-  // The dtor is typically called by the AudioManager only and it is usually
-  // triggered by calling AudioOutputStream::Close().
-  virtual ~AudioHardwareUnifiedStream();
-
-  // Implementation of AudioOutputStream.
-  virtual bool Open() OVERRIDE;
-  virtual void Close() OVERRIDE;
-  virtual void Start(AudioSourceCallback* callback) OVERRIDE;
-  virtual void Stop() OVERRIDE;
-  virtual void SetVolume(double volume) OVERRIDE;
-  virtual void GetVolume(double* volume) OVERRIDE;
-
-  int input_channels() const { return input_channels_; }
-  int output_channels() const { return output_channels_; }
-
- private:
-  OSStatus Render(AudioDeviceID device,
-                  const AudioTimeStamp* now,
-                  const AudioBufferList* input_data,
-                  const AudioTimeStamp* input_time,
-                  AudioBufferList* output_data,
-                  const AudioTimeStamp* output_time);
-
-  static OSStatus RenderProc(AudioDeviceID device,
-                             const AudioTimeStamp* now,
-                             const AudioBufferList* input_data,
-                             const AudioTimeStamp* input_time,
-                             AudioBufferList* output_data,
-                             const AudioTimeStamp* output_time,
-                             void* user_data);
-
-  // Our creator, the audio manager needs to be notified when we close.
-  AudioManagerMac* manager_;
-
-  // Pointer to the object that will provide the audio samples.
-  AudioSourceCallback* source_;
-
-  // Structure that holds the stream format details such as bitrate.
-  AudioStreamBasicDescription format_;
-
-  // Hardware buffer size.
-  int number_of_frames_;
-
-  // Number of audio channels provided to the client via OnMoreIOData().
-  int client_input_channels_;
-
-  // Volume level from 0 to 1.
-  float volume_;
-
-  // Number of input and output channels queried from the hardware.
-  int input_channels_;
-  int output_channels_;
-  int input_channels_per_frame_;
-  int output_channels_per_frame_;
-
-  AudioDeviceIOProcID io_proc_id_;
-  AudioDeviceID device_;
-  bool is_playing_;
-
-  // Intermediate buffers used with call to OnMoreIOData().
-  scoped_ptr<AudioBus> input_bus_;
-  scoped_ptr<AudioBus> output_bus_;
-
-  DISALLOW_COPY_AND_ASSIGN(AudioHardwareUnifiedStream);
-};
-
-}  // namespace media
-
-#endif  // MEDIA_AUDIO_MAC_AUDIO_UNIFIED_MAC_H_