Plumb |input_channels| all the way to AudioManager

media/base/audio_renderer_sink.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_BASE_AUDIO_RENDERER_SINK_H_
 #define MEDIA_BASE_AUDIO_RENDERER_SINK_H_
 
 #include <vector>
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
@@ skipping 23 matching lines @@
 
     // Signals an error has occurred.
     virtual void OnRenderError() = 0;
 
    protected:
     virtual ~RenderCallback() {}
   };
 
   // Sets important information about the audio stream format.
   // It must be called before any of the other methods.
+  // For clients wishing to have synchronized input and output,
+  // |params| may specify |input_channels| > 0, representing a
+  // number of input channels which will be at the same sample-rate
+  // and buffer-size as the output as specified in |params|.
+  // In this case, the callback's RenderIO() method will be called instead
+  // of Render(), providing the synchronized input data at the same time as
+  // when new output data is to be rendered.
   virtual void Initialize(const AudioParameters& params,
                           RenderCallback* callback) = 0;
 
-  // InitializeIO() may be called instead of Initialize() for clients who wish
-  // to have synchronized input and output.  |input_channels| specifies the
-  // number of input channels which will be at the same sample-rate
-  // and buffer-size as the output as specified in |params|.
-  // The callback's RenderIO() method will be called instead of Render(),
-  // providing the synchronized input data at the same time as when new
-  // output data is to be rendered.
-  virtual void InitializeIO(const AudioParameters& params,
-                            int input_channels,
-                            RenderCallback* callback) {}
-
   // Starts audio playback.
   virtual void Start() = 0;
 
   // Stops audio playback.
   virtual void Stop() = 0;
 
   // Pauses playback.
   virtual void Pause(bool flush) = 0;
 
   // Resumes playback after calling Pause().
   virtual void Play() = 0;
 
   // Sets the playback volume, with range [0.0, 1.0] inclusive.
   // Returns |true| on success.
   virtual bool SetVolume(double volume) = 0;
 
  protected:
   friend class base::RefCountedThreadSafe<AudioRendererSink>;
   virtual ~AudioRendererSink() {}
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_AUDIO_RENDERER_SINK_H_