Adding experimental exclusive-mode streaming to WASAPIAudioOutputStream

media/base/media_switches.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/base/media_switches.h"
 
 namespace switches {
 
 #if defined(OS_LINUX) || defined(OS_FREEBSD) || defined(OS_SOLARIS)
 // The Alsa device to use when opening an audio stream.
 const char kAlsaOutputDevice[] = "alsa-output-device";
 // The Alsa device to use when opening an audio input stream.
 const char kAlsaInputDevice[] = "alsa-input-device";
 #endif
 
 #if defined(OS_LINUX)
 // Use CRAS, the ChromeOS audio server.
 const char kUseCras[] = "use-cras";
 #endif
 
 #if defined(OS_POSIX) && !defined(OS_MACOSX)
 // Use PulseAudio on platforms that support it.
 const char kUsePulseAudio[] = "use-pulseaudio";
 #endif
 
+#if defined(OS_WIN)
+// Use exclusive mode audio streaming for Windows Vista and higher.
+// Leads to lower latencies for audio streams which uses the
+// AudioParameters::AUDIO_PCM_LOW_LATENCY audio path.
+// See http://msdn.microsoft.com/en-us/library/windows/desktop/dd370844(v=vs.85).aspx

[tommi (sloooow) - chröme, 2012/07/25 11:49:40]

nit: move url to the next line to stay within 80

[henrika (OOO until Aug 14), 2012/07/25 15:26:30]

Discussed offline. Keeping as is.

+// for details.
+const char kEnableExclusiveMode[] = "enable-exclusive-mode";
+#endif
+
 // Set number of threads to use for video decoding.
 const char kVideoThreads[] = "video-threads";
 
 // Disables browser-side audio mixer.
 const char kDisableAudioMixer[] = "disable-audio-mixer";
 
 }  // namespace switches