Use multiple shared memory buffers cyclically for audio capture.

content/renderer/pepper/pepper_platform_audio_input_impl.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 CONTENT_RENDERER_PEPPER_PEPPER_PLATFORM_AUDIO_INPUT_IMPL_H_
 #define CONTENT_RENDERER_PEPPER_PEPPER_PLATFORM_AUDIO_INPUT_IMPL_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 34 matching lines @@
       int sample_rate,
       int frames_per_buffer,
       webkit::ppapi::PluginDelegate::PlatformAudioInputClient* client);
 
   // PlatformAudioInput implementation (called on main thread).
   virtual void StartCapture() OVERRIDE;
   virtual void StopCapture() OVERRIDE;
   virtual void ShutDown() OVERRIDE;
 
   // media::AudioInputIPCDelegate.
-  virtual void OnStreamCreated(base::SharedMemoryHandle handle,
-                               base::SyncSocket::Handle socket_handle,
-                               int length) OVERRIDE;
+  virtual void OnStreamCreated(base::SyncSocket::Handle socket_handle,
+                               int total_handles) OVERRIDE;
+  virtual void OnSharedMemoryCreated(base::SharedMemoryHandle handle,
+                                     int length,
+                                     int index) OVERRIDE;
   virtual void OnVolume(double volume) OVERRIDE;
   virtual void OnStateChanged(
       media::AudioInputIPCDelegate::State state) OVERRIDE;
   virtual void OnDeviceReady(const std::string&) OVERRIDE;
   virtual void OnIPCClosed() OVERRIDE;
 
  protected:
   virtual ~PepperPlatformAudioInputImpl();
 
  private:
@@ skipping 21 matching lines @@
   void NotifyStreamCreationFailed();
 
   // The client to notify when the stream is created. THIS MUST ONLY BE
   // ACCESSED ON THE MAIN THREAD.
   webkit::ppapi::PluginDelegate::PlatformAudioInputClient* client_;
 
   // Used to send/receive IPC. THIS MUST ONLY BE ACCESSED ON THE
   // I/O thread except to send messages and get the message loop.
   scoped_refptr<AudioInputMessageFilter> ipc_;
 
+  base::SyncSocket::Handle socket_handle_;
+
   // Our ID on the MessageFilter. THIS MUST ONLY BE ACCESSED ON THE I/O THREAD
   // or else you could race with the initialize function which sets it.
   int32 stream_id_;
 
   // The render view into which the audio is sent.
   int render_view_id_;
 
   base::MessageLoopProxy* main_message_loop_proxy_;
 
   // THIS MUST ONLY BE ACCESSED ON THE MAIN THREAD.
   base::WeakPtr<PepperPluginDelegateImpl> plugin_delegate_;
 
   // The unique ID to identify the opened device. THIS MUST ONLY BE ACCESSED ON
   // THE MAIN THREAD.
   std::string label_;
 
   // Whether ShutDownOnIOThread() has been called. THIS MUST ONLY BE ACCESSED ON
   // THE I/O THREAD.
   bool shutdown_called_;
 
   // Initialized on the main thread and accessed on the I/O thread afterwards.
   media::AudioParameters params_;
 
   DISALLOW_COPY_AND_ASSIGN(PepperPlatformAudioInputImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_PLATFORM_AUDIO_INPUT_IMPL_H_