Allow AudioOutputDevice objects to be initialized with a specific hardware output device and store …

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"
@@ skipping 13 matching lines @@
   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:
-
   // 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(
+      bool success,
+      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,
                                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;
+  virtual void OnOutputDeviceSwitched(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();
 };
 
 // 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();
 
+  // Sends a request to authorize the use of a specific audio output device
+  // in the peer process.
+  // If |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 browser attempts to select the device indicated
+  // by |device_id|. If |device_id| is the empty string, the default
+  // audio output device will be selected.
+  // Once the authorization process is complete, the implementation will
+  // notify |delegate| by calling OnDeviceAuthorized().
+  virtual void RequestDeviceAuthorization(AudioOutputIPCDelegate* delegate,
+                                          int session_id,
+                                          const std::string& device_id,
+                                          const GURL& security_origin) = 0;
+
   // Sends a request to create an AudioOutputController object in the peer
   // process and configures it to use the specified audio |params| including
-  // number of synchronized input channels.|session_id| is used by the browser
-  // to select the correct input device if the input channel in |params| is
-  // valid, otherwise it will be ignored.  Once the stream has been created,
-  // the implementation will notify |delegate| by calling OnStreamCreated().
+  // number of synchronized input channels.
+  // Once the stream has been created, the implementation will notify
+  // |delegate| by calling OnStreamCreated().
   virtual void CreateStream(AudioOutputIPCDelegate* delegate,
-                            const AudioParameters& params,
-                            int session_id) = 0;
+                            const AudioParameters& params) = 0;
 
   // Starts playing the stream.  This should generate a call to
   // AudioOutputController::Play().
   virtual void PlayStream() = 0;
 
   // 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;
+                                  const GURL& security_origin) = 0;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_OUTPUT_IPC_H_