Reland 153623004: Remove the unified IO code on the browser

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 70 matching lines @@
   // of the audio stream to be created.
   //
   // |params.sample_per_packet| is the requested buffer allocation which the
   // audio source thinks it can usually fill without blocking. Internally two
   // or three buffers are created, one will be locked for playback and one will
   // be ready to be filled in the call to AudioSourceCallback::OnMoreData().
   //
   // To create a stream for the default output device, pass an empty string
   // for |device_id|, otherwise the specified audio device will be opened.
   //
-  // The |input_device_id| is used for low-latency unified streams
-  // (input+output) only and then only if the audio parameters specify a >0
-  // input channel count.  In other cases this id is ignored and should be
-  // empty.
-  //
   // Returns NULL if the combination of the parameters is not supported, or if
   // we have reached some other platform specific limit.
   //
   // |params.format| can be set to AUDIO_PCM_LOW_LATENCY and that has two
   // effects:
   // 1- Instead of triple buffered the audio will be double buffered.
   // 2- A low latency driver or alternative audio subsystem will be used when
   //    available.
   //
   // Do not free the returned AudioOutputStream. It is owned by AudioManager.
   virtual AudioOutputStream* MakeAudioOutputStream(
       const AudioParameters& params,
-      const std::string& device_id,
-      const std::string& input_device_id) = 0;
+      const std::string& device_id) = 0;
 
   // Creates new audio output proxy. A proxy implements
   // AudioOutputStream interface, but unlike regular output stream
   // created with MakeAudioOutputStream() it opens device only when a
   // sound is actually playing.
   virtual AudioOutputStream* MakeAudioOutputStreamProxy(
       const AudioParameters& params,
-      const std::string& device_id,
-      const std::string& input_device_id) = 0;
+      const std::string& device_id) = 0;
 
   // Factory to create audio recording streams.
   // |channels| can be 1 or 2.
   // |sample_rate| is in hertz and can be any value supported by the platform.
   // |bits_per_sample| can be any value supported by the platform.
   // |samples_per_packet| is in hertz as well and can be 0 to |sample_rate|,
   // with 0 suggesting that the implementation use a default value for that
   // platform.
   // Returns NULL if the combination of the parameters is not supported, or if
   // we have reached some other platform specific limit.
@@ skipping 62 matching lines @@
  protected:
   AudioManager();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AudioManager);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_AUDIO_AUDIO_MANAGER_H_