Allow audio system to handle synchronized low-latency audio I/O

content/renderer/media/audio_message_filter.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/audio_message_filter.h"
 
 #include "base/bind.h"
 #include "base/message_loop.h"
 #include "base/time.h"
 #include "content/common/child_process.h"
@@ skipping 17 matching lines @@
 
 int AudioMessageFilter::AddDelegate(media::AudioOutputIPCDelegate* delegate) {
   return delegates_.Add(delegate);
 }
 
 void AudioMessageFilter::RemoveDelegate(int id) {
   delegates_.Remove(id);
 }
 
 void AudioMessageFilter::CreateStream(int stream_id,
-                                      const media::AudioParameters& params) {
-  Send(new AudioHostMsg_CreateStream(stream_id, params));
+                                      const media::AudioParameters& params,
+                                      int input_channels) {
+  Send(new AudioHostMsg_CreateStream(stream_id, params, input_channels));
 }
 
 void AudioMessageFilter::PlayStream(int stream_id) {
   Send(new AudioHostMsg_PlayStream(stream_id));
 }
 
 void AudioMessageFilter::PauseStream(int stream_id) {
   Send(new AudioHostMsg_PauseStream(stream_id));
 }
 
@@ skipping 96 matching lines @@
 
 void AudioMessageFilter::OnStreamStateChanged(
     int stream_id, media::AudioOutputIPCDelegate::State state) {
   media::AudioOutputIPCDelegate* delegate = delegates_.Lookup(stream_id);
   if (!delegate) {
     DLOG(WARNING) << "No delegate found for state change. " << state;
     return;
   }
   delegate->OnStateChanged(state);
 }