Reland 15721002: Hook up the device selection to the WebAudio live audio

media/audio/audio_manager_base.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_MANAGER_BASE_H_
 #define MEDIA_AUDIO_AUDIO_MANAGER_BASE_H_
 
-#include <map>
 #include <string>
 #include <utility>
 
 #include "base/atomic_ref_count.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/scoped_vector.h"
 #include "base/observer_list.h"
 #include "base/synchronization/lock.h"
 #include "media/audio/audio_manager.h"
 
+#include "media/audio/audio_output_dispatcher.h"
+
 #if defined(OS_WIN)
 #include "base/win/scoped_com_initializer.h"
 #endif
 
 namespace base {
 class Thread;
 }
 
 namespace media {
 
@@ skipping 12 matching lines @@
   virtual scoped_refptr<base::MessageLoopProxy> GetMessageLoop() OVERRIDE;
 
   virtual string16 GetAudioInputDeviceModel() OVERRIDE;
 
   virtual void ShowAudioInputSettings() OVERRIDE;
 
   virtual void GetAudioInputDeviceNames(
       media::AudioDeviceNames* device_names) OVERRIDE;
 
   virtual AudioOutputStream* MakeAudioOutputStream(
-      const AudioParameters& params) OVERRIDE;
+      const AudioParameters& params,
+      const std::string& input_device_id) OVERRIDE;
 
   virtual AudioInputStream* MakeAudioInputStream(
       const AudioParameters& params, const std::string& device_id) OVERRIDE;
 
   virtual AudioOutputStream* MakeAudioOutputStreamProxy(
-      const AudioParameters& params) OVERRIDE;
+      const AudioParameters& params,
+      const std::string& input_device_id) OVERRIDE;
 
   virtual bool IsRecordingInProcess() OVERRIDE;
 
   // Called internally by the audio stream when it has been closed.
   virtual void ReleaseOutputStream(AudioOutputStream* stream);
   virtual void ReleaseInputStream(AudioInputStream* stream);
 
   void IncreaseActiveInputStreamCount();
   void DecreaseActiveInputStreamCount();
 
   // Creates the output stream for the |AUDIO_PCM_LINEAR| format. The legacy
   // name is also from |AUDIO_PCM_LINEAR|.
   virtual AudioOutputStream* MakeLinearOutputStream(
       const AudioParameters& params) = 0;
 
   // Creates the output stream for the |AUDIO_PCM_LOW_LATENCY| format.
+  // |input_device_id| is used by unified IO to open the correct input device.
   virtual AudioOutputStream* MakeLowLatencyOutputStream(
-      const AudioParameters& params) = 0;
+      const AudioParameters& params, const std::string& input_device_id) = 0;
 
   // Creates the input stream for the |AUDIO_PCM_LINEAR| format. The legacy
   // name is also from |AUDIO_PCM_LINEAR|.
   virtual AudioInputStream* MakeLinearInputStream(
       const AudioParameters& params, const std::string& device_id) = 0;
 
   // Creates the input stream for the |AUDIO_PCM_LOW_LATENCY| format.
   virtual AudioInputStream* MakeLowLatencyInputStream(
       const AudioParameters& params, const std::string& device_id) = 0;
 
   // Listeners will be notified on the AudioManager::GetMessageLoop() loop.
   virtual void AddOutputDeviceChangeListener(
       AudioDeviceListener* listener) OVERRIDE;
   virtual void RemoveOutputDeviceChangeListener(
       AudioDeviceListener* listener) OVERRIDE;
 
   virtual AudioParameters GetDefaultOutputStreamParameters() OVERRIDE;
   virtual AudioParameters GetInputStreamParameters(
       const std::string& device_id) OVERRIDE;
 
  protected:
   AudioManagerBase();
 
-  // TODO(dalecurtis): This must change to map both input and output parameters
-  // to a single dispatcher, otherwise on a device state change we'll just get
-  // the exact same invalid dispatcher.
-  typedef std::map<std::pair<AudioParameters, AudioParameters>,
-                   scoped_refptr<AudioOutputDispatcher> >
-      AudioOutputDispatchersMap;
 
   // Shuts down the audio thread and releases all the audio output dispatchers
   // on the audio thread.  All audio streams should be freed before Shutdown()
   // is called.  This must be called in the destructor of every AudioManagerBase
   // implementation.
   void Shutdown();
 
   void SetMaxOutputStreamsAllowed(int max) { max_num_output_streams_ = max; }
 
   // Called by each platform specific AudioManager to notify output state change
   // listeners that a state change has occurred.  Must be called from the audio
   // thread.
   void NotifyAllOutputDeviceChangeListeners();
 
   // Returns the preferred hardware audio output parameters for opening output
   // streams. If the users inject a valid |input_params|, each AudioManager
   // will decide if they should return the values from |input_params| or the
   // default hardware values. If the |input_params| is invalid, it will return
   // the default hardware audio parameters.
   virtual AudioParameters GetPreferredOutputStreamParameters(
       const AudioParameters& input_params) = 0;
 
-  // Map of cached AudioOutputDispatcher instances.  Must only be touched
-  // from the audio thread (no locking).
-  AudioOutputDispatchersMap output_dispatchers_;
-
   // Get number of input or output streams.
   int input_stream_count() { return num_input_streams_; }
   int output_stream_count() { return num_output_streams_; }
 
  private:
+  struct DispatcherParams;
+  typedef ScopedVector<DispatcherParams> AudioOutputDispatchers;
+
+  class CompareByParams;
+
   // Called by Shutdown().
   void ShutdownOnAudioThread();
 
   // Counts the number of active input streams to find out if something else
   // is currently recording in Chrome.
   base::AtomicRefCount num_active_input_streams_;
 
   // Max number of open output streams, modified by
   // SetMaxOutputStreamsAllowed().
   int max_num_output_streams_;
@@ skipping 12 matching lines @@
 
   // Thread used to interact with audio streams created by this audio manager.
   scoped_ptr<base::Thread> audio_thread_;
   mutable base::Lock audio_thread_lock_;
 
   // The message loop of the audio thread this object runs on. Used for internal
   // tasks which run on the audio thread even after Shutdown() has been started
   // and GetMessageLoop() starts returning NULL.
   scoped_refptr<base::MessageLoopProxy> message_loop_;
 
+  // Map of cached AudioOutputDispatcher instances.  Must only be touched
+  // from the audio thread (no locking).
+  AudioOutputDispatchers output_dispatchers_;
+
   DISALLOW_COPY_AND_ASSIGN(AudioManagerBase);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_MANAGER_BASE_H_