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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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| 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND | 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 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 "AudioArray.h" | 32 #include "core/platform/audio/AudioArray.h" |
| 33 #include "AudioSourceProvider.h" | 33 #include "core/platform/audio/AudioSourceProvider.h" |
| 34 | 34 |
| 35 namespace WebCore { | 35 namespace WebCore { |
| 36 | 36 |
| 37 // SincResampler is a high-quality sample-rate converter. | 37 // SincResampler is a high-quality sample-rate converter. |
| 38 | 38 |
| 39 class SincResampler { | 39 class SincResampler { |
| 40 public: | 40 public: |
| 41 // scaleFactor == sourceSampleRate / destinationSampleRate | 41 // scaleFactor == sourceSampleRate / destinationSampleRate |
| 42 // kernelSize can be adjusted for quality (higher is better) | 42 // kernelSize can be adjusted for quality (higher is better) |
| 43 // numberOfKernelOffsets is used for interpolation and is the number of sub-
sample kernel shifts. | 43 // numberOfKernelOffsets is used for interpolation and is the number of sub-
sample kernel shifts. |
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| 77 // m_sourceProvider is used to provide the audio input stream to the resampl
er. | 77 // m_sourceProvider is used to provide the audio input stream to the resampl
er. |
| 78 AudioSourceProvider* m_sourceProvider; | 78 AudioSourceProvider* m_sourceProvider; |
| 79 | 79 |
| 80 // The buffer is primed once at the very beginning of processing. | 80 // The buffer is primed once at the very beginning of processing. |
| 81 bool m_isBufferPrimed; | 81 bool m_isBufferPrimed; |
| 82 }; | 82 }; |
| 83 | 83 |
| 84 } // namespace WebCore | 84 } // namespace WebCore |
| 85 | 85 |
| 86 #endif // SincResampler_h | 86 #endif // SincResampler_h |
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