Adding experimental exclusive-mode streaming to WASAPIAudioOutputStream

media/audio/audio_util.cc

Index: media/audio/audio_util.cc
diff --git a/media/audio/audio_util.cc b/media/audio/audio_util.cc
index 4035d28a589fa4737cee6b1b5561fcca3a02f443..c5df9071386e5d1258f33d80968f491f706fb87e 100644
--- a/media/audio/audio_util.cc
+++ b/media/audio/audio_util.cc
@@ -17,6 +17,9 @@
 
 #include "base/atomicops.h"
 #include "base/basictypes.h"
+#if defined(OS_WIN)

[scherkus (not reviewing), 2012/06/27 04:20:30]

this kind of splitting up + alpha order is a recipe for madness!

typically any OS/#ifdef-specific includes can simply go at the end after all the
common includes in their own a-z orderings:

#include <something>

#include "base/foo.h"
#include "media/common.h"

#if defined(OS_WIN)
#include "base/win/a.h"
#include "base/win/z.h"
#elif defined(OS_MACOSX)
#include "base/mac/a.h"
#include "base/mac/z.h"
#endif

[henrika (OOO until Aug 14), 2012/06/27 11:26:07]

Agree. Will fix.

+#include "base/command_line.h"
+#endif
 #include "base/logging.h"
 #include "base/shared_memory.h"
 #include "base/time.h"
@@ -34,6 +37,7 @@
 #if defined(OS_WIN)
 #include "media/audio/win/audio_low_latency_input_win.h"
 #include "media/audio/win/audio_low_latency_output_win.h"
+#include "media/base/media_switches.h"
 #endif
 
 using base::subtle::Atomic32;
@@ -351,10 +355,15 @@ int GetAudioHardwareSampleRate() {
     return 48000;
   }
 
-  // Hardware sample-rate on Windows can be configured, so we must query.
-  // TODO(henrika): improve possibility to specify audio endpoint.
-  // Use the default device (same as for Wave) for now to be compatible.
-  return WASAPIAudioOutputStream::HardwareSampleRate(eConsole);
+  const CommandLine* cmd_line = CommandLine::ForCurrentProcess();
+  if (!cmd_line->HasSwitch(switches::kEnableExclusiveMode)) {
+    // Hardware sample-rate on Windows can be configured, so we must query.
+    // TODO(henrika): improve possibility to specify audio endpoint.
+    // Use the default device (same as for Wave) for now to be compatible.
+    return WASAPIAudioOutputStream::HardwareSampleRate(eConsole);
+  } else {
+    return 44100;
+  }
 #elif defined(OS_ANDROID)
   return 16000;
 #else
@@ -397,6 +406,12 @@ size_t GetAudioHardwareBufferSize() {
     // and assume 48kHz as default sample rate.
     return 2048;
   }
+
+  const CommandLine* cmd_line = CommandLine::ForCurrentProcess();
+  if (cmd_line->HasSwitch(switches::kEnableExclusiveMode)) {
+    return 256;
+  }
+
   // This call must be done on a COM thread configured as MTA.
   // TODO(tommi): http://code.google.com/p/chromium/issues/detail?id=103835.
   int mixing_sample_rate =