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1 /* | 1 /* |
2 * Copyright (C) 2011 Google Inc. All rights reserved. | 2 * Copyright (C) 2011 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 * | 7 * |
8 * 1. Redistributions of source code must retain the above copyright | 8 * 1. Redistributions of source code must retain the above copyright |
9 * notice, this list of conditions and the following disclaimer. | 9 * notice, this list of conditions and the following disclaimer. |
10 * 2. Redistributions in binary form must reproduce the above copyright | 10 * 2. Redistributions in binary form must reproduce the above copyright |
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26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 */ | 27 */ |
28 | 28 |
29 #ifndef SincResampler_h | 29 #ifndef SincResampler_h |
30 #define SincResampler_h | 30 #define SincResampler_h |
31 | 31 |
32 #include "platform/PlatformExport.h" | 32 #include "platform/PlatformExport.h" |
33 #include "platform/audio/AudioArray.h" | 33 #include "platform/audio/AudioArray.h" |
34 #include "platform/audio/AudioSourceProvider.h" | 34 #include "platform/audio/AudioSourceProvider.h" |
35 | 35 |
36 namespace WebCore { | 36 namespace blink { |
37 | 37 |
38 // SincResampler is a high-quality sample-rate converter. | 38 // SincResampler is a high-quality sample-rate converter. |
39 | 39 |
40 class PLATFORM_EXPORT SincResampler { | 40 class PLATFORM_EXPORT SincResampler { |
41 public: | 41 public: |
42 // scaleFactor == sourceSampleRate / destinationSampleRate | 42 // scaleFactor == sourceSampleRate / destinationSampleRate |
43 // kernelSize can be adjusted for quality (higher is better) | 43 // kernelSize can be adjusted for quality (higher is better) |
44 // numberOfKernelOffsets is used for interpolation and is the number of sub-
sample kernel shifts. | 44 // numberOfKernelOffsets is used for interpolation and is the number of sub-
sample kernel shifts. |
45 SincResampler(double scaleFactor, unsigned kernelSize = 32, unsigned numberO
fKernelOffsets = 32); | 45 SincResampler(double scaleFactor, unsigned kernelSize = 32, unsigned numberO
fKernelOffsets = 32); |
46 | 46 |
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75 const float* m_source; | 75 const float* m_source; |
76 unsigned m_sourceFramesAvailable; | 76 unsigned m_sourceFramesAvailable; |
77 | 77 |
78 // m_sourceProvider is used to provide the audio input stream to the resampl
er. | 78 // m_sourceProvider is used to provide the audio input stream to the resampl
er. |
79 AudioSourceProvider* m_sourceProvider; | 79 AudioSourceProvider* m_sourceProvider; |
80 | 80 |
81 // The buffer is primed once at the very beginning of processing. | 81 // The buffer is primed once at the very beginning of processing. |
82 bool m_isBufferPrimed; | 82 bool m_isBufferPrimed; |
83 }; | 83 }; |
84 | 84 |
85 } // namespace WebCore | 85 } // namespace blink |
86 | 86 |
87 #endif // SincResampler_h | 87 #endif // SincResampler_h |
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