Reland 153623004: Remove the unified IO code on the browser

media/audio/mac/audio_synchronized_mac.h

Index: media/audio/mac/audio_synchronized_mac.h
diff --git a/media/audio/mac/audio_synchronized_mac.h b/media/audio/mac/audio_synchronized_mac.h
deleted file mode 100644
index a6db48e3037d8ee53e72106cdba96adad0018047..0000000000000000000000000000000000000000
--- a/media/audio/mac/audio_synchronized_mac.h
+++ /dev/null
@@ -1,216 +0,0 @@
-// 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_SYNCHRONIZED_MAC_H_
-#define MEDIA_AUDIO_MAC_AUDIO_SYNCHRONIZED_MAC_H_
-
-#include <AudioToolbox/AudioToolbox.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"
-#include "media/base/audio_bus.h"
-#include "media/base/audio_fifo.h"
-
-namespace media {
-
-class AudioManagerMac;
-class ChannelMixer;
-
-// AudioSynchronizedStream allows arbitrary combinations of input and output
-// devices running off different clocks and using different drivers, with
-// potentially differing sample-rates.  It implements AudioOutputStream
-// and shuttles its synchronized I/O data using AudioSourceCallback.
-//
-// It is required to first acquire the native sample rate of the selected
-// output device and then use the same rate when creating this object.
-//
-// ............................................................................
-// Theory of Operation:
-//                                       .
-//      INPUT THREAD                     .             OUTPUT THREAD
-//   +-----------------+     +------+    .
-//   | Input AudioUnit | --> |      |    .
-//   +-----------------+     |      |    .
-//                           | FIFO |    .
-//                           |      |        +-----------+
-//                           |      | -----> | Varispeed |
-//                           |      |        +-----------+
-//                           +------+    .         |
-//                                       .         |              +-----------+
-//                                       .    OnMoreIOData() -->  | Output AU |
-//                                       .                        +-----------+
-//
-// The input AudioUnit's InputProc is called on one thread which feeds the
-// FIFO.  The output AudioUnit's OutputProc is called on a second thread
-// which pulls on the varispeed to get the current input data.  The varispeed
-// handles mismatches between input and output sample-rate and also clock drift
-// between the input and output drivers.  The varispeed consumes its data from
-// the FIFO and adjusts its rate dynamically according to the amount
-// of data buffered in the FIFO.  If the FIFO starts getting too much data
-// buffered then the varispeed will speed up slightly to compensate
-// and similarly if the FIFO doesn't have enough data buffered then the
-// varispeed will slow down slightly.
-//
-// Finally, once the input data is available then OnMoreIOData() is called
-// which is given this input, and renders the output which is finally sent
-// to the Output AudioUnit.
-class AudioSynchronizedStream : public AudioOutputStream {
- public:
-  // The ctor takes all the usual parameters, plus |manager| which is the
-  // the audio manager who is creating this object.
-  AudioSynchronizedStream(AudioManagerMac* manager,
-                          const AudioParameters& params,
-                          AudioDeviceID input_id,
-                          AudioDeviceID output_id);
-
-  virtual ~AudioSynchronizedStream();
-
-  // 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;
-
-  OSStatus SetInputDeviceAsCurrent(AudioDeviceID input_id);
-  OSStatus SetOutputDeviceAsCurrent(AudioDeviceID output_id);
-  AudioDeviceID GetInputDeviceID() { return input_info_.id_;  }
-  AudioDeviceID GetOutputDeviceID() { return output_info_.id_; }
-
-  bool IsRunning();
-
- private:
-  // Initialization.
-  OSStatus CreateAudioUnits();
-  OSStatus SetupInput(AudioDeviceID input_id);
-  OSStatus EnableIO();
-  OSStatus SetupOutput(AudioDeviceID output_id);
-  OSStatus SetupCallbacks();
-  OSStatus SetupStreamFormats();
-  void AllocateInputData();
-
-  // Handlers for the AudioUnit callbacks.
-  OSStatus HandleInputCallback(AudioUnitRenderActionFlags* io_action_flags,
-                               const AudioTimeStamp* time_stamp,
-                               UInt32 bus_number,
-                               UInt32 number_of_frames,
-                               AudioBufferList* io_data);
-
-  OSStatus HandleVarispeedCallback(AudioUnitRenderActionFlags* io_action_flags,
-                                   const AudioTimeStamp* time_stamp,
-                                   UInt32 bus_number,
-                                   UInt32 number_of_frames,
-                                   AudioBufferList* io_data);
-
-  OSStatus HandleOutputCallback(AudioUnitRenderActionFlags* io_action_flags,
-                                const AudioTimeStamp* time_stamp,
-                                UInt32 bus_number,
-                                UInt32 number_of_frames,
-                                AudioBufferList* io_data);
-
-  // AudioUnit callbacks.
-  static OSStatus InputProc(void* user_data,
-                            AudioUnitRenderActionFlags* io_action_flags,
-                            const AudioTimeStamp* time_stamp,
-                            UInt32 bus_number,
-                            UInt32 number_of_frames,
-                            AudioBufferList* io_data);
-
-  static OSStatus VarispeedProc(void* user_data,
-                                AudioUnitRenderActionFlags* io_action_flags,
-                                const AudioTimeStamp* time_stamp,
-                                UInt32 bus_number,
-                                UInt32 number_of_frames,
-                                AudioBufferList* io_data);
-
-  static OSStatus OutputProc(void* user_data,
-                             AudioUnitRenderActionFlags* io_action_flags,
-                             const AudioTimeStamp* time_stamp,
-                             UInt32 bus_number,
-                             UInt32 number_of_frames,
-                             AudioBufferList*  io_data);
-
-  // Our creator.
-  AudioManagerMac* manager_;
-
-  // Client parameters.
-  AudioParameters params_;
-
-  double input_sample_rate_;
-  double output_sample_rate_;
-
-  // Pointer to the object that will provide the audio samples.
-  AudioSourceCallback* source_;
-
-  // Values used in Open().
-  AudioDeviceID input_id_;
-  AudioDeviceID output_id_;
-
-  // The input AudioUnit renders its data here.
-  AudioBufferList* input_buffer_list_;
-
-  // Holds the actual data for |input_buffer_list_|.
-  scoped_ptr<AudioBus> input_bus_;
-
-  // Used to overlay AudioBufferLists.
-  scoped_ptr<AudioBus> wrapper_bus_;
-
-  class AudioDeviceInfo {
-   public:
-    AudioDeviceInfo()
-        : id_(kAudioDeviceUnknown),
-          is_input_(false),
-          buffer_size_frames_(0) {}
-    void Initialize(AudioDeviceID inID, bool isInput);
-    bool IsInitialized() const { return id_ != kAudioDeviceUnknown; }
-
-    AudioDeviceID id_;
-    bool is_input_;
-    UInt32 buffer_size_frames_;
-  };
-
-  AudioDeviceInfo input_info_;
-  AudioDeviceInfo output_info_;
-
-  // Used for input to output buffering.
-  AudioFifo fifo_;
-
-  // The optimal number of frames we'd like to keep in the FIFO at all times.
-  int target_fifo_frames_;
-
-  // A running average of the measured delta between actual number of frames
-  // in the FIFO versus |target_fifo_frames_|.
-  double average_delta_;
-
-  // A varispeed rate scalar which is calculated based on FIFO drift.
-  double fifo_rate_compensation_;
-
-  // AudioUnits.
-  AudioUnit input_unit_;
-  AudioUnit varispeed_unit_;
-  AudioUnit output_unit_;
-
-  double first_input_time_;
-
-  bool is_running_;
-  int hardware_buffer_size_;
-  int channels_;
-
-  // Channel mixer used to transform mono to stereo data. It is only created
-  // if the input_hardware_channels is mono.
-  scoped_ptr<ChannelMixer> channel_mixer_;
-  scoped_ptr<AudioBus> mixer_bus_;
-
-  DISALLOW_COPY_AND_ASSIGN(AudioSynchronizedStream);
-};
-
-}  // namespace media
-
-#endif  // MEDIA_AUDIO_MAC_AUDIO_SYNCHRONIZED_MAC_H_