Mojofication of the Chrome Audio Rendering Prototype

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/memory/shared_memory.h"
 #include "base/sync_socket.h"
+#include "content/common/media/audio_output.mojom.h"
 #include "media/audio/audio_parameters.h"
 #include "media/base/media_export.h"
 #include "media/base/output_device_info.h"
 #include "url/origin.h"
 
+namespace mojom {
+class AudioOutputStreamPtr;
+}
+
 namespace media {
 
+class AudioOutputIPC;
+
 // 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
 };
 
 // Contains IPC notifications for the state of the server side
 // (AudioOutputController) audio state changes and when an AudioOutputController
 // has been created.  Implemented by AudioOutputDevice.
 class MEDIA_EXPORT AudioOutputIPCDelegate {
  public:
+  virtual AudioOutputIPC* getIPC() = 0;
+
   // Called when state of an audio stream has changed.
   virtual void OnStateChanged(AudioOutputIPCDelegateState state) = 0;
 
   // Called when an authorization request for an output device has been
   // completed
   virtual void OnDeviceAuthorized(
       OutputDeviceStatus device_status,
       const media::AudioParameters& output_params) = 0;
 
   // Called when an audio stream has been created.
   // The shared memory |handle| points to a memory section that's used to
   // 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,
+  virtual void OnStreamCreated(content::mojom::AudioOutputStreamPtr* stream,
+                               base::SharedMemoryHandle handle,
                                base::SyncSocket::Handle socket_handle,
                                int length) = 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();
 };
 
 // Provides the IPC functionality for an AudioOutputIPCDelegate (e.g., an
 // AudioOutputDevice).  The implementation should asynchronously deliver the
 // messages to an AudioOutputController object (or create one in the case of
 // CreateStream()), that may live in a separate process.
 class MEDIA_EXPORT AudioOutputIPC {
  public:
   virtual ~AudioOutputIPC();
 
+  content::mojom::AudioOutputStreamPtr* GetAudioOutputStream();
+
+  void SetAudioOutputStream(content::mojom::AudioOutputStreamPtr* stream);
+
   // Sends a request to authorize the use of a specific audio output device
   // in the peer process.
   // If |device_id| is nonempty, the browser selects the device
   // indicated by |device_id|, regardless of the value of |session_id|.
   // If |device_id| is empty and |session_id| is nonzero, the browser selects
   // the output device associated with an opened input device indicated by
   // |session_id|. If no such device is found, the default device will be
   // selected.
   // If |device_id| is empty and |session_id| is zero, the browser selects
   // the default device.
@@ 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;
+
+ private:
+  content::mojom::AudioOutputStreamPtr* stream_;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_OUTPUT_IPC_H_