Add a parameter to CreateAudioStream to choose between standard and low-latency mode.

chrome/browser/renderer_host/audio_renderer_host.h

 // Copyright (c) 2010 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.
 //
 // AudioRendererHost serves audio related requests from AudioRenderer which
 // lives inside the render process and provide access to audio hardware. It maps
 // an internal ID to AudioRendererHost::IPCAudioSource in a map, which is the
 // actual object providing audio packets through IPC. It creates the actual
 // AudioOutputStream object when requested by the renderer provided with
 // render view id and stream id.
@@ skipping 162 matching lines @@
         AudioRendererHost* host,             // Host of this source.
         int process_id,                      // Process ID of renderer.
         int route_id,                        // Routing ID to RenderView.
         int stream_id,                       // ID of this source.
         base::ProcessHandle process_handle,  // Process handle of renderer.
         AudioManager::Format format,         // Format of the stream.
         int channels,                        // Number of channels.
         int sample_rate,                     // Sampling frequency/rate.
         char bits_per_sample,                // Number of bits per sample.
         uint32 decoded_packet_size,          // Number of bytes per packet.
-        uint32 buffer_capacity               // Number of bytes in the buffer.
+        uint32 buffer_capacity,              // Number of bytes in the buffer.
+        bool low_latency                     // Use low-latency (socket) code
     );
     ~IPCAudioSource();
 
     // Methods to control playback of the stream.
     // Starts the playback of this audio output stream. The internal state will
     // be updated to AudioOutputStream::STATE_STARTED and the state update is
     // sent to the renderer.
     void Play();
 
     // Pause this audio output stream. The audio output stream will stop
@@ skipping 87 matching lines @@
   // Returns true if the message is an audio related message and should be
   // handled by this class.
   bool IsAudioRendererHostMessage(const IPC::Message& message);
 
   // Audio related IPC message handlers.
   // Creates an audio output stream with the specified format. If this call is
   // successful this object would keep an internal entry of the stream for the
   // required properties. See IPCAudioSource::CreateIPCAudioSource() for more
   // details.
   void OnCreateStream(const IPC::Message& msg, int stream_id,
-                      const ViewHostMsg_Audio_CreateStream_Params& params);
+                      const ViewHostMsg_Audio_CreateStream_Params& params,
+                      bool low_latency);
 
   // Starts buffering for the audio output stream. Delegates the start method
   // call to the corresponding IPCAudioSource::Play().
   // ViewMsg_NotifyAudioStreamStateChanged with
   // AudioOutputStream::AUDIO_STREAM_ERROR is sent back to renderer if the
   // required IPCAudioSource is not found.
   void OnPlayStream(const IPC::Message& msg, int stream_id);
 
   // Pauses the audio output stream. Delegates the pause method call to the
   // corresponding IPCAudioSource::Pause(),
@@ skipping 56 matching lines @@
 
   // A map of id to audio sources.
   typedef std::pair<int32, int32> SourceID;
   typedef std::map<SourceID, IPCAudioSource*> SourceMap;
   SourceMap sources_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioRendererHost);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_AUDIO_RENDERER_HOST_H_