Remove deprecated non-AUHAL audio path on OSX.

media/audio/mac/audio_low_latency_output_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.
-//
-// Implementation notes:
-//
-// - It is recommended to first acquire the native sample rate of the default
-//   output device and then use the same rate when creating this object.
-//   Use AUAudioOutputStream::HardwareSampleRate() to retrieve the sample rate.
-// - Calling Close() also leads to self destruction.
-// - The latency consists of two parts:
-//   1) Hardware latency, which includes Audio Unit latency, audio device
-//      latency;
-//   2) The delay between the moment getting the callback and the scheduled time
-//      stamp that tells when the data is going to be played out.
-//
-#ifndef MEDIA_AUDIO_MAC_AUDIO_LOW_LATENCY_OUTPUT_MAC_H_
-#define MEDIA_AUDIO_MAC_AUDIO_LOW_LATENCY_OUTPUT_MAC_H_
-
-#include <AudioUnit/AudioUnit.h>
-#include <CoreAudio/CoreAudio.h>
-
-#include "base/compiler_specific.h"
-#include "base/synchronization/lock.h"
-#include "media/audio/audio_io.h"
-#include "media/audio/audio_parameters.h"
-
-namespace media {
-
-class AudioManagerMac;
-
-// Implementation of AudioOuputStream for Mac OS X using the
-// default output Audio Unit present in OS 10.4 and later.
-// The default output Audio Unit is for low-latency audio I/O.
-class AUAudioOutputStream : public AudioOutputStream {
- public:
-  // The ctor takes all the usual parameters, plus |manager| which is the
-  // the audio manager who is creating this object.
-  AUAudioOutputStream(AudioManagerMac* manager,
-                      const AudioParameters& params);
-  // The dtor is typically called by the AudioManager only and it is usually
-  // triggered by calling AudioOutputStream::Close().
-  virtual ~AUAudioOutputStream();
-
-  // 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;
-
-  static int HardwareSampleRate();
-
- private:
-  // DefaultOutputUnit callback.
-  static OSStatus InputProc(void* user_data,
-                            AudioUnitRenderActionFlags* flags,
-                            const AudioTimeStamp* time_stamp,
-                            UInt32 bus_number,
-                            UInt32 number_of_frames,
-                            AudioBufferList* io_data);
-
-  OSStatus Render(UInt32 number_of_frames, AudioBufferList* io_data,
-                  const AudioTimeStamp* output_time_stamp);
-
-  // Sets up the stream format for the default output Audio Unit.
-  bool Configure();
-
-  // Gets the fixed playout device hardware latency and stores it. Returns 0
-  // if not available.
-  double GetHardwareLatency();
-
-  // Gets the current playout latency value.
-  double GetPlayoutLatency(const AudioTimeStamp* output_time_stamp);
-
-  // Our creator, the audio manager needs to be notified when we close.
-  AudioManagerMac* manager_;
-
-  size_t number_of_frames_;
-
-  // Pointer to the object that will provide the audio samples.
-  AudioSourceCallback* source_;
-
-  // Protects |source_|.  Necessary since Render() calls seem to be in flight
-  // when |output_unit_| is supposedly stopped.  See http://crbug.com/178765.
-  base::Lock source_lock_;
-
-  // Structure that holds the stream format details such as bitrate.
-  AudioStreamBasicDescription format_;
-
-  // The default output Audio Unit which talks to the audio hardware.
-  AudioUnit output_unit_;
-
-  // The UID refers to the current output audio device.
-  AudioDeviceID output_device_id_;
-
-  // Volume level from 0 to 1.
-  float volume_;
-
-  // Fixed playout hardware latency in frames.
-  double hardware_latency_frames_;
-
-  // The flag used to stop the streaming.
-  bool stopped_;
-
-  // Container for retrieving data from AudioSourceCallback::OnMoreData().
-  scoped_ptr<AudioBus> audio_bus_;
-
-  DISALLOW_COPY_AND_ASSIGN(AUAudioOutputStream);
-};
-
-}  // namespace media
-
-#endif  // MEDIA_AUDIO_MAC_AUDIO_LOW_LATENCY_OUTPUT_MAC_H_