Add support for the audio-output-device switching IPC mechanism to the renderer lower layers (media…

media/audio/audio_output_ipc.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 MEDIA_AUDIO_AUDIO_OUTPUT_IPC_H_
 #define MEDIA_AUDIO_AUDIO_OUTPUT_IPC_H_
 
 #include <string>
 
+#include "base/callback.h"
 #include "base/memory/shared_memory.h"
 #include "base/sync_socket.h"
 #include "media/audio/audio_parameters.h"
 #include "media/base/media_export.h"
 #include "url/gurl.h"
 
 namespace media {
 
 // Result of an audio output device switch operation
 enum SwitchOutputDeviceResult {
   SWITCH_OUTPUT_DEVICE_RESULT_SUCCESS = 0,
   SWITCH_OUTPUT_DEVICE_RESULT_ERROR_NOT_FOUND,
   SWITCH_OUTPUT_DEVICE_RESULT_ERROR_NOT_AUTHORIZED,
   SWITCH_OUTPUT_DEVICE_RESULT_ERROR_OBSOLETE,
   SWITCH_OUTPUT_DEVICE_RESULT_ERROR_NOT_SUPPORTED,
   SWITCH_OUTPUT_DEVICE_RESULT_LAST =
       SWITCH_OUTPUT_DEVICE_RESULT_ERROR_NOT_SUPPORTED,
 };
 
+typedef base::Callback<void(SwitchOutputDeviceResult)> SwitchOutputDeviceCB;
+
 // Current status of the audio output stream in the browser process. Browser
 // sends information about the current playback state and error to the
 // renderer process using this type.
 enum AudioOutputIPCDelegateState {
   AUDIO_OUTPUT_IPC_DELEGATE_STATE_PLAYING,
   AUDIO_OUTPUT_IPC_DELEGATE_STATE_PAUSED,
   AUDIO_OUTPUT_IPC_DELEGATE_STATE_ERROR,
   AUDIO_OUTPUT_IPC_DELEGATE_STATE_LAST = AUDIO_OUTPUT_IPC_DELEGATE_STATE_ERROR
 };
 
@@ skipping 11 matching lines @@
   // transfer audio buffers from the AudioOutputIPCDelegate back to the
   // AudioRendererHost.  The implementation of OnStreamCreated takes ownership.
   // The |socket_handle| is used by AudioRendererHost to signal requests for
   // audio data to be written into the shared memory. The AudioOutputIPCDelegate
   // must read from this socket and provide audio whenever data (search for
   // "pending_bytes") is received.
   virtual void OnStreamCreated(base::SharedMemoryHandle handle,
                                base::SyncSocket::Handle socket_handle,
                                int length) = 0;
 
+  // Called when an attempt to switch the output device has been completed
+  virtual void OnOutputDeviceSwitched(int request_id,
+                                      SwitchOutputDeviceResult result) = 0;
+
   // Called when the AudioOutputIPC object is going away and/or when the IPC
   // channel has been closed and no more ipc requests can be made.
   // Implementations should delete their owned AudioOutputIPC instance
   // immediately.
   virtual void OnIPCClosed() = 0;
 
  protected:
   virtual ~AudioOutputIPCDelegate();
 };
 
@@ skipping 22 matching lines @@
   // Pauses an audio stream.  This should generate a call to
   // AudioOutputController::Pause().
   virtual void PauseStream() = 0;
 
   // Closes the audio stream which should shut down the corresponding
   // AudioOutputController in the peer process.
   virtual void CloseStream() = 0;
 
   // Sets the volume of the audio stream.
   virtual void SetVolume(double volume) = 0;
+
+  // Switches the output device of the audio stream.
+  virtual void SwitchOutputDevice(const std::string& device_id,
+                                  const GURL& security_origin,
+                                  int request_id) = 0;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_OUTPUT_IPC_H_