Continue with the FreeBSD port - this version builds and links, though...

media/audio/freebsd/audio_manager_freebsd.h

+// Copyright (c) 2009 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_LINUX_AUDIO_MANAGER_FREEBSD_H_
+#define MEDIA_AUDIO_LINUX_AUDIO_MANAGER_FREEBSD_H_
+
+//#include <map>
+
+//#include "base/ref_counted.h"
+//#include "base/scoped_ptr.h"
+//#include "base/thread.h"
+#include "media/audio/audio_output.h"
+
+class AudioManagerFreeBSD : public AudioManager {
+ public:
+  AudioManagerFreeBSD();
+
+  // Call before using a newly created AudioManagerFreeBSD instance.
+  virtual void Init();
+
+  // Implementation of AudioManager.
+  virtual bool HasAudioDevices();
+  virtual AudioOutputStream* MakeAudioStream(Format format, int channels,
+                                             int sample_rate,
+                                             char bits_per_sample);
+  virtual void MuteAll();
+  virtual void UnMuteAll();
+
+ protected:
+  // Friend function for invoking the destructor at exit.
+  friend void DestroyAudioManagerFreeBSD(void*);
+  virtual ~AudioManagerFreeBSD();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(AudioManagerFreeBSD);
+};
+
+#endif  // MEDIA_AUDIO_LINUX_AUDIO_MANAGER_FREEBSD_H_