Simplify AudioInputRendererHost IPC interface.

media/audio/audio_input_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_INPUT_IPC_H_
 #define MEDIA_AUDIO_AUDIO_INPUT_IPC_H_
 
 #include <stdint.h>
 
 #include "base/memory/shared_memory.h"
 #include "base/sync_socket.h"
 #include "media/base/audio_parameters.h"
 #include "media/base/media_export.h"
 
 namespace media {
 
-enum AudioInputIPCDelegateState {
-  AUDIO_INPUT_IPC_DELEGATE_STATE_RECORDING,
-  AUDIO_INPUT_IPC_DELEGATE_STATE_STOPPED,
-  AUDIO_INPUT_IPC_DELEGATE_STATE_ERROR,
-  AUDIO_INPUT_IPC_DELEGATE_STATE_LAST = AUDIO_INPUT_IPC_DELEGATE_STATE_ERROR,
-};
-
 // Contains IPC notifications for the state of the server side
 // (AudioInputController) audio state changes and when an AudioInputController
 // has been created.  Implemented by AudioInputDevice.
 class MEDIA_EXPORT AudioInputIPCDelegate {
  public:
   // Called when an AudioInputController has been created.
   // The shared memory |handle| points to a memory section that's used to
   // transfer data between the AudioInputDevice and AudioInputController
   // objects.  The implementation of OnStreamCreated takes ownership.
   // The |socket_handle| is used by the AudioInputController to signal
   // notifications that more data is available and can optionally provide
   // parameter changes back.  The AudioInputDevice must read from this socket
   // and process the shared memory whenever data is read from the socket.
   virtual void OnStreamCreated(base::SharedMemoryHandle handle,
                                base::SyncSocket::Handle socket_handle,
                                int length,
                                int total_segments) = 0;
 
   // Called when state of an audio stream has changed.
-  virtual void OnStateChanged(AudioInputIPCDelegateState state) = 0;
-
-  // Called when the input stream volume has changed.
-  virtual void OnVolume(double volume) = 0;
+  virtual void OnError() = 0;
 
   // Called when the AudioInputIPC 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 AudioInputIPC instance
   // immediately.
   virtual void OnIPCClosed() = 0;
 
  protected:
   virtual ~AudioInputIPCDelegate();
 };
@@ skipping 24 matching lines @@
   virtual void SetVolume(double volume) = 0;
 
   // Closes the audio stream, which should shut down the corresponding
   // AudioInputController in the peer process.
   virtual void CloseStream() = 0;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_INPUT_IPC_H_