Add GetOutputStreamParameters, GetAssociatedOutputDeviceID to AudioManager.

media/audio/audio_manager.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_H_
 #define MEDIA_AUDIO_AUDIO_MANAGER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 127 matching lines @@
   virtual void AddOutputDeviceChangeListener(AudioDeviceListener* listener) = 0;
   virtual void RemoveOutputDeviceChangeListener(
       AudioDeviceListener* listener) = 0;
 
   // Returns the default output hardware audio parameters for opening output
   // streams. It is a convenience interface to
   // AudioManagerBase::GetPreferredOutputStreamParameters and each AudioManager
   // does not need their own implementation to this interface.
   virtual AudioParameters GetDefaultOutputStreamParameters() = 0;
 
+  // Returns the output hardware audio parameters for a specific output device.

[henrika (OOO until Aug 14), 2013/09/04 11:11:40]

Did you consider using only this method and use a special input string for
default instead of having to similar API:s? Breaks less code I guess.

[tommi (sloooow) - chröme, 2013/09/04 13:06:55]

Yes, that's the goal but I decided not to remove the other method in this cl but
I plan on doing it later.

+  virtual AudioParameters GetOutputStreamParameters(
+      const std::string& device_id) = 0;
+
   // Returns the input hardware audio parameters of the specific device
   // for opening input streams. Each AudioManager needs to implement their own
   // version of this interface.
   virtual AudioParameters GetInputStreamParameters(
       const std::string& device_id) = 0;
 
+  // Returns the device id of an output device that belongs to the same hardware
+  // as the specified input device.
+  // If the hardware has only an input device (e.g. a webcam), the return value
+  // will be empty (which the caller can then interpret to be the default output
+  // device).  Implementations that don't yet support this feature, must return
+  // an empty string.
+  virtual std::string GetAssociatedOutputDeviceID(

[henrika (OOO until Aug 14), 2013/09/04 11:11:40]

Like the name Associated.

+      const std::string& input_device_id) = 0;
+
  protected:
   AudioManager();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AudioManager);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_MANAGER_H_