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| 1 /* | 1 /* |
| 2 * Copyright (C) 2010, Google Inc. All rights reserved. | 2 * Copyright (C) 2010, Google Inc. All rights reserved. |
| 3 * | 3 * |
| 4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
| 5 * modification, are permitted provided that the following conditions | 5 * modification, are permitted provided that the following conditions |
| 6 * are met: | 6 * are met: |
| 7 * 1. Redistributions of source code must retain the above copyright | 7 * 1. Redistributions of source code must retain the above copyright |
| 8 * notice, this list of conditions and the following disclaimer. | 8 * notice, this list of conditions and the following disclaimer. |
| 9 * 2. Redistributions in binary form must reproduce the above copyright | 9 * 2. Redistributions in binary form must reproduce the above copyright |
| 10 * notice, this list of conditions and the following disclaimer in the | 10 * notice, this list of conditions and the following disclaimer in the |
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| 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH | 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH |
| 23 * DAMAGE. | 23 * DAMAGE. |
| 24 */ | 24 */ |
| 25 | 25 |
| 26 #ifndef AudioResamplerKernel_h | 26 #ifndef AudioResamplerKernel_h |
| 27 #define AudioResamplerKernel_h | 27 #define AudioResamplerKernel_h |
| 28 | 28 |
| 29 #include "platform/PlatformExport.h" | 29 #include "platform/PlatformExport.h" |
| 30 #include "platform/audio/AudioArray.h" | 30 #include "platform/audio/AudioArray.h" |
| 31 #include "wtf/Allocator.h" | 31 #include "platform/wtf/Allocator.h" |
| 32 | 32 |
| 33 namespace blink { | 33 namespace blink { |
| 34 | 34 |
| 35 class AudioResampler; | 35 class AudioResampler; |
| 36 | 36 |
| 37 // AudioResamplerKernel does resampling on a single mono channel. | 37 // AudioResamplerKernel does resampling on a single mono channel. |
| 38 // It uses a simple linear interpolation for good performance. | 38 // It uses a simple linear interpolation for good performance. |
| 39 | 39 |
| 40 class PLATFORM_EXPORT AudioResamplerKernel { | 40 class PLATFORM_EXPORT AudioResamplerKernel { |
| 41 USING_FAST_MALLOC(AudioResamplerKernel); | 41 USING_FAST_MALLOC(AudioResamplerKernel); |
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| 78 // process(). m_fillIndex represents how many buffered samples we have which | 78 // process(). m_fillIndex represents how many buffered samples we have which |
| 79 // can be as many as 2. For the first call to process() (or after reset()) | 79 // can be as many as 2. For the first call to process() (or after reset()) |
| 80 // there will be no buffered samples. | 80 // there will be no buffered samples. |
| 81 float m_lastValues[2]; | 81 float m_lastValues[2]; |
| 82 unsigned m_fillIndex; | 82 unsigned m_fillIndex; |
| 83 }; | 83 }; |
| 84 | 84 |
| 85 } // namespace blink | 85 } // namespace blink |
| 86 | 86 |
| 87 #endif // AudioResamplerKernel_h | 87 #endif // AudioResamplerKernel_h |
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