Reland 15721002: Hook up the device selection to the WebAudio live audio

media/audio/audio_output_device.h

Index: media/audio/audio_output_device.h
diff --git a/media/audio/audio_output_device.h b/media/audio/audio_output_device.h
index a16b9edb5c922b0923ed0c5982aa00ad120ea0b9..2af4f48e7ecf7bd24eea09fd0a09abe854c335ee 100644
--- a/media/audio/audio_output_device.h
+++ b/media/audio/audio_output_device.h
@@ -81,6 +81,18 @@ class MEDIA_EXPORT AudioOutputDevice
   AudioOutputDevice(scoped_ptr<AudioOutputIPC> ipc,
                     const scoped_refptr<base::MessageLoopProxy>& io_loop);
 
+  // Initialize function for clients wishing to have unified 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|. |session_id| is
+  // used for the browser to select the correct input device.
+  // 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.
+  void InitializeUnifiedStream(const AudioParameters& params,
+                               RenderCallback* callback,
+                               int session_id);
+
   // AudioRendererSink implementation.
   virtual void Initialize(const AudioParameters& params,
                           RenderCallback* callback) OVERRIDE;
@@ -144,6 +156,10 @@ class MEDIA_EXPORT AudioOutputDevice
   // State of Play() / Pause() calls before OnStreamCreated() is called.
   bool play_on_start_;
 
+  // The media session ID used to identify which input device to be started.
+  // Only used by Unified IO.
+  int session_id_;
+
   // Our audio thread callback class.  See source file for details.
   class AudioThreadCallback;