1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef MEDIA_BASE_AUDIO_HARDWARE_CONFIG_H_
6 #define MEDIA_BASE_AUDIO_HARDWARE_CONFIG_H_
8 #include "base/compiler_specific.h"
9 #include "base/synchronization/lock.h"
10 #include "media/audio/audio_parameters.h"
11 #include "media/base/channel_layout.h"
12 #include "media/base/media_export.h"
16 // Provides thread safe access to the audio hardware configuration.
17 class MEDIA_EXPORT AudioHardwareConfig
{
19 AudioHardwareConfig(const media::AudioParameters
& input_params
,
20 const media::AudioParameters
& output_params
);
21 virtual ~AudioHardwareConfig();
23 // Accessors for the currently cached hardware configuration. Safe to call
25 int GetOutputBufferSize() const;
26 int GetOutputSampleRate() const;
27 ChannelLayout
GetOutputChannelLayout() const;
28 int GetOutputChannels() const;
30 int GetInputSampleRate() const;
31 ChannelLayout
GetInputChannelLayout() const;
32 int GetInputChannels() const;
34 media::AudioParameters
GetInputConfig() const;
35 media::AudioParameters
GetOutputConfig() const;
37 // Allows callers to update the cached values for either input or output. The
38 // values are paired under the assumption that these values will only be set
39 // after an input or output device change respectively. Safe to call from
41 void UpdateInputConfig(const media::AudioParameters
& input_params
);
42 void UpdateOutputConfig(const media::AudioParameters
& output_params
);
45 // Cached values; access is protected by |config_lock_|.
46 mutable base::Lock config_lock_
;
47 media::AudioParameters input_params_
;
48 media::AudioParameters output_params_
;
50 DISALLOW_COPY_AND_ASSIGN(AudioHardwareConfig
);
55 #endif // MEDIA_BASE_AUDIO_HARDWARE_CONFIG_H_