Low-latency AudioInputStream implementation based on WASAPI for Windows.

media/audio/win/avrt_wrapper_win.h

Index: media/audio/win/avrt_wrapper_win.h
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--- media/audio/win/avrt_wrapper_win.h	(revision 0)
+++ media/audio/win/avrt_wrapper_win.h	(revision 0)
@@ -0,0 +1,40 @@
+// Copyright (c) 2011 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.
+//
+// The AvrtWrapper class encapsulates the details needed to support MMCSS.
+//
+// The Multimedia Class Scheduler service (MMCSS) enables multimedia
+// applications to ensure that their time-sensitive processing receives
+// prioritized access to CPU resources. This service enables multimedia
+// applications to utilize as much of the CPU as possible without denying
+// CPU resources to lower-priority applications.
+// MMCSS requires Windows Vista or higher and that the Avrt DLL is loaded.
+//
+#ifndef MEDIA_AUDIO_WIN_AVRT_WRAPPER_WIN_H_
+#define MEDIA_AUDIO_WIN_AVRT_WRAPPER_WIN_H_
+
+#include <windows.h>
+#include <avrt.h>
+
+#include "base/basictypes.h"
+
+class AvrtWrapper {
+ public:
+  AvrtWrapper() {}
+  ~AvrtWrapper() {}
+
+  // Loads the Avrt.dll which is available on Windows Vista and later.
+  bool Initialize();
+
+  // Function wrappers for the underlying MMCSS functions.
+  bool AvRevertMmThreadCharacteristics(HANDLE avrt_handle);
+  HANDLE AvSetMmThreadCharacteristics(const char* task_name, DWORD* task_index);
+  bool AvSetMmThreadPriority(HANDLE avrt_handle, AVRT_PRIORITY priority);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(AvrtWrapper);
+};
+
+#endif  // MEDIA_AUDIO_WIN_AVRT_WRAPPER_WIN_H_
+
Property changes on: media\audio\win\avrt_wrapper_win.h
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Added: svn:eol-style
   + LF