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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 |
| (...skipping 10 matching lines...) Expand all Loading... |
| 21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | 21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 22 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | 22 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 23 */ | 23 */ |
| 24 | 24 |
| 25 #ifndef AudioResamplerKernel_h | 25 #ifndef AudioResamplerKernel_h |
| 26 #define AudioResamplerKernel_h | 26 #define AudioResamplerKernel_h |
| 27 | 27 |
| 28 #include "platform/PlatformExport.h" | 28 #include "platform/PlatformExport.h" |
| 29 #include "platform/audio/AudioArray.h" | 29 #include "platform/audio/AudioArray.h" |
| 30 | 30 |
| 31 namespace WebCore { | 31 namespace blink { |
| 32 | 32 |
| 33 class AudioResampler; | 33 class AudioResampler; |
| 34 | 34 |
| 35 // AudioResamplerKernel does resampling on a single mono channel. | 35 // AudioResamplerKernel does resampling on a single mono channel. |
| 36 // It uses a simple linear interpolation for good performance. | 36 // It uses a simple linear interpolation for good performance. |
| 37 | 37 |
| 38 class PLATFORM_EXPORT AudioResamplerKernel { | 38 class PLATFORM_EXPORT AudioResamplerKernel { |
| 39 public: | 39 public: |
| 40 AudioResamplerKernel(AudioResampler*); | 40 AudioResamplerKernel(AudioResampler*); |
| 41 | 41 |
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| 65 double m_virtualReadIndex; | 65 double m_virtualReadIndex; |
| 66 | 66 |
| 67 // We need to have continuity from one call of process() to the next. | 67 // We need to have continuity from one call of process() to the next. |
| 68 // m_lastValues stores the last two sample values from the last call to proc
ess(). | 68 // m_lastValues stores the last two sample values from the last call to proc
ess(). |
| 69 // m_fillIndex represents how many buffered samples we have which can be as
many as 2. | 69 // m_fillIndex represents how many buffered samples we have which can be as
many as 2. |
| 70 // For the first call to process() (or after reset()) there will be no buffe
red samples. | 70 // For the first call to process() (or after reset()) there will be no buffe
red samples. |
| 71 float m_lastValues[2]; | 71 float m_lastValues[2]; |
| 72 unsigned m_fillIndex; | 72 unsigned m_fillIndex; |
| 73 }; | 73 }; |
| 74 | 74 |
| 75 } // namespace WebCore | 75 } // namespace blink |
| 76 | 76 |
| 77 #endif // AudioResamplerKernel_h | 77 #endif // AudioResamplerKernel_h |
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