Moving SwitchOutputDevice out of OutputDevice interface, eliminating OutputDevice

media/audio/audio_parameters.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_PARAMETERS_H_
 #define MEDIA_AUDIO_AUDIO_PARAMETERS_H_
 
 #include <stdint.h>
 #include <string>
 
@@ skipping 159 matching lines @@
   int effects() const { return effects_; }
 
   void set_mic_positions(const std::vector<Point>& mic_positions) {
     mic_positions_ = mic_positions;
   }
   const std::vector<Point>& mic_positions() const { return mic_positions_; }
 
   AudioParameters(const AudioParameters&);
   AudioParameters& operator=(const AudioParameters&);
 
+  // Creates reasonable dummy parameters in case no device is available.
+  static AudioParameters UnavailableDeviceParams();
+
  private:
   Format format_;                 // Format of the stream.
   ChannelLayout channel_layout_;  // Order of surround sound channels.
   int channels_;                  // Number of channels. Value set based on
                                   // |channel_layout|.
   int sample_rate_;               // Sampling frequency/rate.
   int bits_per_sample_;           // Number of bits per sample.
   int frames_per_buffer_;         // Number of frames in a buffer.
   int effects_;                   // Bitmask using PlatformEffectsMask.
 
@@ skipping 20 matching lines @@
   if (a.sample_rate() != b.sample_rate())
     return a.sample_rate() < b.sample_rate();
   if (a.bits_per_sample() != b.bits_per_sample())
     return a.bits_per_sample() < b.bits_per_sample();
   return a.frames_per_buffer() < b.frames_per_buffer();
 }
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_PARAMETERS_H_