Use 2 buffers on presumable good Windows boxes.

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 226 matching lines @@
 
 // Factory for the implementations of AudioOutputStream for AUDIO_PCM_LINEAR
 // mode.
 // - PCMWaveOutAudioOutputStream: Based on the waveOut API.
 AudioOutputStream* AudioManagerWin::MakeLinearOutputStream(
       const AudioParameters& params) {
   DCHECK_EQ(AudioParameters::AUDIO_PCM_LINEAR, params.format());
   if (params.channels() > kWinMaxChannels)
     return NULL;
 
-  return new PCMWaveOutAudioOutputStream(this, params, 3, WAVE_MAPPER);
+  return new PCMWaveOutAudioOutputStream(this,
+                                         params,
+                                         media::NumberOfWaveOutBuffers(),
+                                         WAVE_MAPPER);
 }
 
 // Factory for the implementations of AudioOutputStream for
 // AUDIO_PCM_LOW_LATENCY mode. Two implementations should suffice most
 // windows user's needs.
 // - PCMWaveOutAudioOutputStream: Based on the waveOut API.
 // - WASAPIAudioOutputStream: Based on Core Audio (WASAPI) API.
 AudioOutputStream* AudioManagerWin::MakeLowLatencyOutputStream(
       const AudioParameters& params) {
   DCHECK_EQ(AudioParameters::AUDIO_PCM_LOW_LATENCY, params.format());
@@ skipping 56 matching lines @@
   return new PCMWaveInAudioInputStream(this, params, kNumInputBuffers,
                                        xp_device_id);
 }
 
 /// static
 AudioManager* CreateAudioManager() {
   return new AudioManagerWin();
 }
 
 }  // namespace media