Plumb |input_channels| all the way to AudioManager

media/audio/win/audio_manager_win.cc

 // 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.
 
 #include "media/audio/audio_io.h"
 
 #include <windows.h>
 #include <objbase.h>  // This has to be before initguid.h
 #include <initguid.h>
 #include <mmsystem.h>
@@ skipping 274 matching lines @@
   if (params.channels() > kWinMaxChannels)
     return NULL;
 
   if (!CoreAudioUtil::IsSupported()) {
     // Fall back to Windows Wave implementation on Windows XP or lower.
     DVLOG(1) << "Using WaveOut since WASAPI requires at least Vista.";
     return new PCMWaveOutAudioOutputStream(
         this, params, media::NumberOfWaveOutBuffers(), WAVE_MAPPER);
   }
 
-  // TODO(henrika): remove once we properly handle input device selection.
-  if (CommandLine::ForCurrentProcess()->HasSwitch(
+  // TODO(crogers): support more than stereo input.
+  // TODO(henrika): remove flag once we properly handle input device selection.
+  // https://code.google.com/p/chromium/issues/detail?id=147327
+  if (params.input_channels() == 2 &&
+      CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kEnableWebAudioInput)) {
     if (WASAPIUnifiedStream::HasUnifiedDefaultIO()) {
       DVLOG(1) << "WASAPIUnifiedStream is created.";
       return new WASAPIUnifiedStream(this, params);
     }
     LOG(WARNING) << "Unified audio I/O is not supported.";
   }
 
   return new WASAPIAudioOutputStream(this, params, eConsole);
 }
@@ skipping 61 matching lines @@
     channel_layout = WASAPIAudioOutputStream::HardwareChannelLayout();
   }
 
   // TODO(dalecurtis): This should include hardware bits per channel eventually.
   return AudioParameters(
       AudioParameters::AUDIO_PCM_LOW_LATENCY, channel_layout,
       sample_rate, bits_per_sample, GetAudioHardwareBufferSize());
 }
 
 }  // namespace media