Refactoring to share MockAudioOutputStream implementations across 3 platforms

media/audio/audio_output.h

 // Copyright (c) 2006-2008 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_AUDIO_OUTPUT_H_
 #define MEDIA_AUDIO_AUDIO_OUTPUT_H_
 
 #include "base/basictypes.h"
 
 // Low-level audio output support. To make sound there are 3 objects involved:
@@ skipping 73 matching lines @@
   // two buffers of |packet_size| size are created, one will be locked for
   // playback and one will be ready to be filled in the call to
   // AudioSourceCallback::OnMoreData().
   //
   // TODO(ajwong): Streams are not reusable, so try to move packet_size into the
   // constructor.
   virtual bool Open(size_t packet_size) = 0;
 
   // Starts playing audio and generating AudioSourceCallback::OnMoreData().
   // Since implementor of AudioOutputStream may have internal buffers, right
-  // after calling this method initial buffers are fetched. User of this
-  // object should prepare |AudioOutputStream::GetNumBuffers()| before calling
-  // AudioOutputStream::Start().
+  // after calling this method initial buffers are fetched.
   //
   // The output stream does not take ownership of this callback.
   virtual void Start(AudioSourceCallback* callback) = 0;
 
   // Stops playing audio. Effect might not be instantaneous as the hardware
   // might have locked audio data that is processing.
   virtual void Stop() = 0;
 
   // Sets the relative volume, with range [0.0, 1.0] inclusive. For mono audio
   // sources the volume must be the same in both channels.
   virtual void SetVolume(double left_level, double right_level) = 0;
 
   // Gets the relative volume, with range [0.0, 1.0] inclusive. For mono audio
   // sources the level is returned in both channels.
   virtual void GetVolume(double* left_level, double* right_level) = 0;
 
   // Close the stream. This also generates AudioSourceCallback::OnClose().
   // After calling this method, the object should not be used anymore.
   virtual void Close() = 0;
 
-  // Gets the number of internal buffers used in this output stream. This
-  // method is useful for providing information about how user of this object
-  // should prepare initial buffers before calling AudioOutputStream::Start().
-  virtual size_t GetNumBuffers() = 0;
-
  protected:
   virtual ~AudioOutputStream() {}
 };
 
 // Manages all audio resources. In particular it owns the AudioOutputStream
 // objects. Provides some convenience functions that avoid the need to provide
 // iterators over the existing streams.
 class AudioManager {
  public:
   enum Format {
@@ skipping 25 matching lines @@
   // Do not free the returned AudioOutputStream. It is owned by AudioManager.
   virtual AudioOutputStream* MakeAudioStream(Format format, int channels,
                                              int sample_rate,
                                              char bits_per_sample) = 0;
 
   // Muting continues playback but effectively the volume is set to zero.
   // Un-muting returns the volume to the previous level.
   virtual void MuteAll() = 0;
   virtual void UnMuteAll() = 0;
 
-  // For testing purposes only. Returns the internal buffer of the last
-  // AUDIO_MOCK AudioOutputStream closed. Returns NULL if none closed yet.
-  // The buffer size is the same as passed to AudioOutputStream::Open().
-  virtual const void* GetLastMockBuffer() = 0;
-
   // Get AudioManager singleton.
   // TODO(cpu): Define threading requirements for interacting with AudioManager.
   static AudioManager* GetAudioManager();
 
  protected:
   virtual ~AudioManager() {}
 };
 
 
 #endif  // MEDIA_AUDIO_AUDIO_OUTPUT_H_