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| 1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2006-2008 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 #ifndef MEDIA_AUDIO_WAVEOUT_OUTPUT_WIN_H_ | 5 #ifndef MEDIA_AUDIO_WAVEOUT_OUTPUT_WIN_H_ | 
| 6 #define MEDIA_AUDIO_WAVEOUT_OUTPUT_WIN_H_ | 6 #define MEDIA_AUDIO_WAVEOUT_OUTPUT_WIN_H_ | 
| 7 | 7 | 
| 8 #include <windows.h> | 8 #include <windows.h> | 
| 9 #include <mmsystem.h> | 9 #include <mmsystem.h> | 
| 10 | 10 | 
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| 33                               char bits_per_sample, UINT device_id); | 33                               char bits_per_sample, UINT device_id); | 
| 34   virtual ~PCMWaveOutAudioOutputStream(); | 34   virtual ~PCMWaveOutAudioOutputStream(); | 
| 35 | 35 | 
| 36   // Implementation of AudioOutputStream. | 36   // Implementation of AudioOutputStream. | 
| 37   virtual bool Open(size_t packet_size); | 37   virtual bool Open(size_t packet_size); | 
| 38   virtual void Close(); | 38   virtual void Close(); | 
| 39   virtual void Start(AudioSourceCallback* callback); | 39   virtual void Start(AudioSourceCallback* callback); | 
| 40   virtual void Stop(); | 40   virtual void Stop(); | 
| 41   virtual void SetVolume(double left_level, double right_level); | 41   virtual void SetVolume(double left_level, double right_level); | 
| 42   virtual void GetVolume(double* left_level, double* right_level); | 42   virtual void GetVolume(double* left_level, double* right_level); | 
| 43   virtual size_t GetNumBuffers(); |  | 
| 44 | 43 | 
| 45   // Sends a buffer to the audio driver for playback. | 44   // Sends a buffer to the audio driver for playback. | 
| 46   void QueueNextPacket(WAVEHDR* buffer); | 45   void QueueNextPacket(WAVEHDR* buffer); | 
| 47 | 46 | 
| 48  private: | 47  private: | 
| 49   enum State { | 48   enum State { | 
| 50     PCMA_BRAND_NEW,    // Initial state. | 49     PCMA_BRAND_NEW,    // Initial state. | 
| 51     PCMA_READY,        // Device obtained and ready to play. | 50     PCMA_READY,        // Device obtained and ready to play. | 
| 52     PCMA_PLAYING,      // Playing audio. | 51     PCMA_PLAYING,      // Playing audio. | 
| 53     PCMA_STOPPING,     // Trying to stop, waiting for callback to finish. | 52     PCMA_STOPPING,     // Trying to stop, waiting for callback to finish. | 
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| 97   // Pointer to the first allocated audio buffer. This object owns it. | 96   // Pointer to the first allocated audio buffer. This object owns it. | 
| 98   WAVEHDR*  buffer_; | 97   WAVEHDR*  buffer_; | 
| 99 | 98 | 
| 100   // An event that is signaled when the callback thread is ready to stop. | 99   // An event that is signaled when the callback thread is ready to stop. | 
| 101   ScopedHandle stopped_event_; | 100   ScopedHandle stopped_event_; | 
| 102 | 101 | 
| 103   DISALLOW_COPY_AND_ASSIGN(PCMWaveOutAudioOutputStream); | 102   DISALLOW_COPY_AND_ASSIGN(PCMWaveOutAudioOutputStream); | 
| 104 }; | 103 }; | 
| 105 | 104 | 
| 106 #endif  // MEDIA_AUDIO_WAVEOUT_OUTPUT_WIN_H_ | 105 #endif  // MEDIA_AUDIO_WAVEOUT_OUTPUT_WIN_H_ | 
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