Add WebKit API to retrieve the audio hardware sample-rate

media/audio/audio_util.cc

Index: media/audio/audio_util.cc
===================================================================
--- media/audio/audio_util.cc	(revision 78925)
+++ media/audio/audio_util.cc	(working copy)
@@ -11,6 +11,9 @@
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "media/audio/audio_util.h"
+#if defined(OS_MACOSX)
+#include "media/audio/mac/audio_low_latency_output_mac.h"
+#endif
 
 namespace media {
 
@@ -219,4 +222,16 @@
   }
 }
 
+double GetAudioHardwareSampleRate()
+{

[scherkus (not reviewing), 2011/03/23 04:57:57]

nit: chromium style has brackets go on the function

+#if defined(OS_MACOSX)
+    // Hardware sample-rate on the Mac can be configured, so we must query.

[scherkus (not reviewing), 2011/03/23 04:57:57]

nit: two space indent

+    return AUAudioOutputStream::HardwareSampleRate();
+#else
+    // Hardware for Windows and Linux is nearly always 48KHz.
+    // TODO(crogers) : return correct value in rare non-48KHz cases.

[scherkus (not reviewing), 2011/03/23 04:57:57]

this isn't quite true... in fact chrome os was shipping with 44.1khz default (I
think) but we're changing it back to 48khz

do you have any intention on implementing this?  can we get a bug filed?

+    return 48000.0;
+#endif
+}
+
 }  // namespace media