Low level windows audio support (part 1 of 2)...

media/audio/win/audio_manager_win.h

+// Copyright (c) 2006-2008 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.
+
+#ifndef MEDIA_AUDIO_AUDIO_MANAGER_WIN_H_
+#define MEDIA_AUDIO_AUDIO_MANAGER_WIN_H_
+
+#include <windows.h>
+
+#include "base/basictypes.h"
+#include "media/audio/audio_output.h"
+
+class PCMWaveOutAudioOutputStream;
+class AudioOutputStreamMockWin;
+
+// Windows implementation of the AudioManager singleton. This class is internal
+// to the audio output and only internal users can call methods not exposed by
+// the AudioManager class.
+class AudioManagerWin : public AudioManager {
+ public:
+  AudioManagerWin() {}
+  // Implementation of AudioManager.
+  virtual AudioOutputStream* MakeAudioStream(Format format, int channels,
+                                             int sample_rate,
+                                             char bits_per_sample);
+  virtual void MuteAll();
+  virtual void UnMuteAll();
+  virtual const void* GetLastMockBuffer();
+
+  // Windows-only methods to free a stream created in MakeAudioStream. These
+  // are called internally by the audio stream when it has been closed.
+  void ReleaseStream(PCMWaveOutAudioOutputStream* stream);
+  void ReleaseStream(AudioOutputStreamMockWin* stream);
+
+ private:
+  virtual ~AudioManagerWin();
+  DISALLOW_COPY_AND_ASSIGN(AudioManagerWin);
+};
+
+#endif  // MEDIA_AUDIO_AUDIO_MANAGER_WIN_H_
+