Renderer side audio device change wip...

media/base/audio_hardware_config.h

Index: media/base/audio_hardware_config.h
diff --git a/media/base/audio_hardware_config.h b/media/base/audio_hardware_config.h
new file mode 100644
index 0000000000000000000000000000000000000000..08668215614e4ac4754979e469e059f850e8809b
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+++ b/media/base/audio_hardware_config.h
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+// Copyright (c) 2013 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_BASE_AUDIO_HARDWARE_CONFIG_H_
+#define MEDIA_BASE_AUDIO_HARDWARE_CONFIG_H_
+
+#include "media/base/channel_layout.h"
+#include "media/base/media_export.h"
+
+namespace media {
+
+// Interface for providing access to the audio hardware configuration from the
+// renderer side.  Browser side clients should query the methods in audio_util
+// directly.
+class MEDIA_EXPORT AudioHardwareConfig {
+ public:
+  // Accessors for the currently cached hardware configuration.
+  virtual int GetOutputBufferSize() = 0;
+  virtual int GetOutputSampleRate() = 0;
+  virtual int GetInputSampleRate() = 0;
+  virtual ChannelLayout GetInputChannelLayout() = 0;
+
+ protected:
+  virtual ~AudioHardwareConfig() {}
+};
+
+}  // namespace media
+
+#endif  // MEDIA_BASE_AUDIO_HARDWARE_CONFIG_H_