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

media/audio/audio_output_device.h

Index: media/audio/audio_output_device.h
diff --git a/media/audio/audio_output_device.h b/media/audio/audio_output_device.h
index 8046fd1060acfd940891502cc75fdc131c53342a..d5ce695e6cac7fe5e18b410fe7b2f451ff9aa2e3 100644
--- a/media/audio/audio_output_device.h
+++ b/media/audio/audio_output_device.h
@@ -22,16 +22,22 @@
 // State sequences.
 //
 //            Task [IO thread]                  IPC [IO thread]
+// RequestDeviceAuthorization -> RequestDeviceAuthorizationOnIOThread ------>
+// RequestDeviceAuthorization ->
+//             <- OnDeviceAuthorized <- AudioMsg_NotifyDeviceAuthorized <-
 //
 // Start -> CreateStreamOnIOThread -----> CreateStream ------>
 //       <- OnStreamCreated <- AudioMsg_NotifyStreamCreated <-
 //       ---> PlayOnIOThread -----------> PlayStream -------->
 //
-// Optionally Play() / Pause() sequences may occur:
+// Optionally Play() / Pause() / SwitchOutputDevice() sequences may occur:
 // Play -> PlayOnIOThread --------------> PlayStream --------->
 // Pause -> PauseOnIOThread ------------> PauseStream -------->
-// (note that Play() / Pause() sequences before OnStreamCreated are
-//  deferred until OnStreamCreated, with the last valid state being used)
+// SwitchOutputDevice -> SwitchOutputDeviceOnIOThread -> SwitchOutputDevice ->
+//         <- OnOutputDeviceSwitched <- AudioMsg_NotifyOutputDeviceSwitched <-
+// (note that Play() / Pause() / SwitchOutptuDevice() sequences before
+// OnStreamCreated are deferred until OnStreamCreated, with the last valid
+// state being used)
 //
 // AudioOutputDevice::Render => audio transport on audio thread =>
 //                               |
@@ -64,6 +70,7 @@
 #include "base/bind.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/shared_memory.h"
+#include "base/synchronization/waitable_event.h"
 #include "media/audio/audio_device_thread.h"
 #include "media/audio/audio_output_ipc.h"
 #include "media/audio/audio_parameters.h"
@@ -83,13 +90,13 @@ class MEDIA_EXPORT AudioOutputDevice
   // NOTE: Clients must call Initialize() before using.
   AudioOutputDevice(
       scoped_ptr<AudioOutputIPC> ipc,
-      const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner);
+      const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner,
+      int session_id,
+      const std::string& device_id,
+      const url::Origin& security_origin);
 
-  // Initialize the stream using |session_id|, which is used for the browser
-  // to select the correct input device.
-  void InitializeWithSessionId(const AudioParameters& params,
-                               RenderCallback* callback,
-                               int session_id);
+  // Request authorization to use the device specified in the constructor.
+  void RequestDeviceAuthorization();
 
   // AudioRendererSink implementation.
   void Initialize(const AudioParameters& params,
@@ -103,17 +110,19 @@ class MEDIA_EXPORT AudioOutputDevice
 
   // OutputDevice implementation
   void SwitchOutputDevice(const std::string& device_id,
-                          const GURL& security_origin,
+                          const url::Origin& security_origin,
                           const SwitchOutputDeviceCB& callback) override;
+  AudioParameters GetOutputParameters() override;
 
   // Methods called on IO thread ----------------------------------------------
   // AudioOutputIPCDelegate methods.
   void OnStateChanged(AudioOutputIPCDelegateState state) override;
+  void OnDeviceAuthorized(bool success,
+                          const media::AudioParameters& output_params) override;
   void OnStreamCreated(base::SharedMemoryHandle handle,
                        base::SyncSocket::Handle socket_handle,
                        int length) override;
-  void OnOutputDeviceSwitched(int request_id,
-                              SwitchOutputDeviceResult result) override;
+  void OnOutputDeviceSwitched(SwitchOutputDeviceResult result) override;
   void OnIPCClosed() override;
 
  protected:
@@ -125,10 +134,12 @@ class MEDIA_EXPORT AudioOutputDevice
  private:
   // Note: The ordering of members in this enum is critical to correct behavior!
   enum State {
-    IPC_CLOSED,  // No more IPCs can take place.
-    IDLE,  // Not started.
+    IPC_CLOSED,       // No more IPCs can take place.
+    IDLE,             // Not started.
+    AUTHORIZING,      // Sent device authorization request, waiting for reply.
+    AUTHORIZED,       // Successful device authorization received.
     CREATING_STREAM,  // Waiting for OnStreamCreated() to be called back.
-    PAUSED,  // Paused.  OnStreamCreated() has been called.  Can Play()/Stop().
+    PAUSED,   // Paused.  OnStreamCreated() has been called.  Can Play()/Stop().
     PLAYING,  // Playing back.  Can Pause()/Stop().
   };
 
@@ -136,20 +147,24 @@ class MEDIA_EXPORT AudioOutputDevice
   // The following methods are tasks posted on the IO thread that need to
   // be executed on that thread.  They use AudioOutputIPC to send IPC messages
   // upon state changes.
+  void RequestDeviceAuthorizationOnIOThread();
   void CreateStreamOnIOThread(const AudioParameters& params);
   void PlayOnIOThread();
   void PauseOnIOThread();
   void ShutDownOnIOThread();
   void SetVolumeOnIOThread(double volume);
   void SwitchOutputDeviceOnIOThread(const std::string& device_id,
-                                    const GURL& security_origin,
+                                    const url::Origin& security_origin,
                                     const SwitchOutputDeviceCB& callback);
 
   // base::MessageLoop::DestructionObserver implementation for the IO loop.
   // If the IO loop dies before we do, we shut down the audio thread from here.
   void WillDestroyCurrentMessageLoop() override;
 
-  void SetCurrentSwitchRequest(const SwitchOutputDeviceCB& callback);
+  void SetCurrentSwitchRequest(const SwitchOutputDeviceCB& callback,
+                               const std::string& device_id,
+                               const url::Origin& security_origin);
+  void SetOutputParams(const media::AudioParameters& output_params);
 
   AudioParameters audio_parameters_;
 
@@ -164,6 +179,9 @@ class MEDIA_EXPORT AudioOutputDevice
   // State enum above.
   State state_;
 
+  // State of Start() calls before OnDeviceAuthorized() is called.
+  bool start_on_authorized_;
+
   // State of Play() / Pause() calls before OnStreamCreated() is called.
   bool play_on_start_;
 
@@ -171,6 +189,10 @@ class MEDIA_EXPORT AudioOutputDevice
   // Only used by Unified IO.
   int session_id_;
 
+  // ID of hardware output device to be used (provided session_id_ is zero)
+  std::string device_id_;
+  url::Origin security_origin_;
+
   // Our audio thread callback class.  See source file for details.
   class AudioThreadCallback;
 
@@ -188,8 +210,13 @@ class MEDIA_EXPORT AudioOutputDevice
   // the callback via Start(). See http://crbug.com/151051 for details.
   bool stopping_hack_;
 
-  int current_switch_request_id_;
   SwitchOutputDeviceCB current_switch_callback_;
+  std::string current_switch_device_id_;
+  url::Origin current_switch_security_origin_;
+  bool switch_output_device_on_start_;
+
+  base::WaitableEvent did_set_output_params_;
+  media::AudioParameters output_params_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioOutputDevice);
 };