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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 "base/compiler_specific.h"
#include "base/synchronization/lock.h"
#include "media/base/channel_layout.h"
#include "media/base/media_export.h"
namespace media {
// Provides thread safe access to the audio hardware configuration.
class MEDIA_EXPORT AudioHardwareConfig {
public:
AudioHardwareConfig(int output_buffer_size, int output_sample_rate,
int input_sample_rate,
ChannelLayout input_channel_layout);
virtual ~AudioHardwareConfig();
// Accessors for the currently cached hardware configuration. Safe to call
// from any thread.
int GetOutputBufferSize();
int GetOutputSampleRate();
int GetInputSampleRate();
ChannelLayout GetInputChannelLayout();
// Allows callers to update the cached values for either input or output. The
// values are paired under the assumption that these values will only be set
// after an input or output device change respectively. Safe to call from
// any thread.
void UpdateInputConfig(int sample_rate, media::ChannelLayout channel_layout);
void UpdateOutputConfig(int buffer_size, int sample_rate);
private:
// Cached values; access is protected by |config_lock_|.
base::Lock config_lock_;
int output_buffer_size_;
int output_sample_rate_;
int input_sample_rate_;
ChannelLayout input_channel_layout_;
DISALLOW_COPY_AND_ASSIGN(AudioHardwareConfig);
};
} // namespace media
#endif // MEDIA_BASE_AUDIO_HARDWARE_CONFIG_H_
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