Update RendererWebKitPlatformSupportImpl::createAudioDevice() to handle |input_channels|

content/renderer/media/renderer_webaudiodevice_impl.cc

 // 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.
 
 #include "content/renderer/media/renderer_webaudiodevice_impl.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "content/renderer/media/audio_device_factory.h"
 #include "content/renderer/media/renderer_audio_output_device.h"
 #include "content/renderer/render_view_impl.h"
 #include "media/base/media_switches.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebView.h"
 
 using WebKit::WebAudioDevice;
 using WebKit::WebFrame;
 using WebKit::WebVector;
 using WebKit::WebView;
 
 namespace content {
 
 RendererWebAudioDeviceImpl::RendererWebAudioDeviceImpl(
     const media::AudioParameters& params,
+    unsigned input_channels,
     WebAudioDevice::RenderCallback* callback)
     : params_(params),
+      input_channels_(input_channels),
       client_callback_(callback) {
   DCHECK(client_callback_);
 }
 
 RendererWebAudioDeviceImpl::~RendererWebAudioDeviceImpl() {
   DCHECK(!output_device_);
 }
 
 void RendererWebAudioDeviceImpl::start() {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   if (output_device_)
     return;  // Already started.
 
   output_device_ = AudioDeviceFactory::NewOutputDevice();
-
-  // TODO(crogers): remove once we properly handle input device selection.
-  // https://code.google.com/p/chromium/issues/detail?id=147327
-  if (CommandLine::ForCurrentProcess()->HasSwitch(
-      switches::kEnableWebAudioInput)) {
-    // TODO(crogers): support more than hard-coded stereo:
-    // https://code.google.com/p/chromium/issues/detail?id=147326
-    output_device_->InitializeIO(params_, 2, this);
-  } else {
-    output_device_->Initialize(params_, this);
-  }
+  output_device_->InitializeIO(params_, input_channels_, this);
 
   // Assumption: This method is being invoked within a V8 call stack.  CHECKs
   // will fail in the call to frameForCurrentContext() otherwise.
   //
   // Therefore, we can perform look-ups to determine which RenderView is
   // starting the audio device.  The reason for all this is because the creator
   // of the WebAudio objects might not be the actual source of the audio (e.g.,
   // an extension creates a object that is passed and used within a page).
   WebFrame* const web_frame = WebFrame::frameForCurrentContext();
   WebView* const web_view = web_frame ? web_frame->view() : NULL;
@@ skipping 48 matching lines @@
                              web_audio_data,
                              dest->frames());
   }
 }
 
 void RendererWebAudioDeviceImpl::OnRenderError() {
   // TODO(crogers): implement error handling.
 }
 
 }  // namespace content