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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 // | 4 // |
5 // Implementation of AudioInputStream for Windows using Windows Core Audio | 5 // Implementation of AudioInputStream for Windows using Windows Core Audio |
6 // WASAPI for low latency capturing. | 6 // WASAPI for low latency capturing. |
7 // | 7 // |
8 // Overview of operation: | 8 // Overview of operation: |
9 // | 9 // |
10 // - An object of WASAPIAudioInputStream is created by the AudioManager | 10 // - An object of WASAPIAudioInputStream is created by the AudioManager |
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98 virtual bool Open() OVERRIDE; | 98 virtual bool Open() OVERRIDE; |
99 virtual void Start(AudioInputCallback* callback) OVERRIDE; | 99 virtual void Start(AudioInputCallback* callback) OVERRIDE; |
100 virtual void Stop() OVERRIDE; | 100 virtual void Stop() OVERRIDE; |
101 virtual void Close() OVERRIDE; | 101 virtual void Close() OVERRIDE; |
102 virtual double GetMaxVolume() OVERRIDE; | 102 virtual double GetMaxVolume() OVERRIDE; |
103 virtual void SetVolume(double volume) OVERRIDE; | 103 virtual void SetVolume(double volume) OVERRIDE; |
104 virtual double GetVolume() OVERRIDE; | 104 virtual double GetVolume() OVERRIDE; |
105 | 105 |
106 // Retrieves the sample rate used by the audio engine for its internal | 106 // Retrieves the sample rate used by the audio engine for its internal |
107 // processing/mixing of shared-mode streams given a specifed device. | 107 // processing/mixing of shared-mode streams given a specifed device. |
108 static double HardwareSampleRate(const std::string& device_id); | 108 static int HardwareSampleRate(const std::string& device_id); |
109 | 109 |
110 // Retrieves the number of audio channels used by the audio engine for its | 110 // Retrieves the number of audio channels used by the audio engine for its |
111 // internal processing/mixing of shared-mode streams given a specifed device. | 111 // internal processing/mixing of shared-mode streams given a specifed device. |
112 static uint32 HardwareChannelCount(const std::string& device_id); | 112 static uint32 HardwareChannelCount(const std::string& device_id); |
113 | 113 |
114 bool started() const { return started_; } | 114 bool started() const { return started_; } |
115 | 115 |
116 private: | 116 private: |
117 // DelegateSimpleThread::Delegate implementation. | 117 // DelegateSimpleThread::Delegate implementation. |
118 virtual void Run() OVERRIDE; | 118 virtual void Run() OVERRIDE; |
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204 // recorded. | 204 // recorded. |
205 base::win::ScopedHandle audio_samples_ready_event_; | 205 base::win::ScopedHandle audio_samples_ready_event_; |
206 | 206 |
207 // This event will be signaled when capturing shall stop. | 207 // This event will be signaled when capturing shall stop. |
208 base::win::ScopedHandle stop_capture_event_; | 208 base::win::ScopedHandle stop_capture_event_; |
209 | 209 |
210 DISALLOW_COPY_AND_ASSIGN(WASAPIAudioInputStream); | 210 DISALLOW_COPY_AND_ASSIGN(WASAPIAudioInputStream); |
211 }; | 211 }; |
212 | 212 |
213 #endif // MEDIA_AUDIO_WIN_AUDIO_LOW_LATENCY_INPUT_WIN_H_ | 213 #endif // MEDIA_AUDIO_WIN_AUDIO_LOW_LATENCY_INPUT_WIN_H_ |
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