| /* |
| * Copyright (C) 2011, Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
| * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON |
| * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef WaveShaperDSPKernel_h |
| #define WaveShaperDSPKernel_h |
| |
| #include "platform/audio/AudioArray.h" |
| #include "platform/audio/AudioDSPKernel.h" |
| #include "platform/audio/DownSampler.h" |
| #include "platform/audio/UpSampler.h" |
| #include "modules/webaudio/WaveShaperProcessor.h" |
| #include "wtf/OwnPtr.h" |
| |
| namespace WebCore { |
| |
| class WaveShaperProcessor; |
| |
| // WaveShaperDSPKernel is an AudioDSPKernel and is responsible for non-linear distortion on one channel. |
| |
| class WaveShaperDSPKernel : public AudioDSPKernel { |
| public: |
| explicit WaveShaperDSPKernel(WaveShaperProcessor*); |
| |
| // AudioDSPKernel |
| virtual void process(const float* source, float* dest, size_t framesToProcess); |
| virtual void reset(); |
| virtual double tailTime() const OVERRIDE { return 0; } |
| virtual double latencyTime() const OVERRIDE; |
| |
| // Oversampling requires more resources, so let's only allocate them if needed. |
| void lazyInitializeOversampling(); |
| |
| protected: |
| // Apply the shaping curve. |
| void processCurve(const float* source, float* dest, size_t framesToProcess); |
| |
| // Use up-sampling, process at the higher sample-rate, then down-sample. |
| void processCurve2x(const float* source, float* dest, size_t framesToProcess); |
| void processCurve4x(const float* source, float* dest, size_t framesToProcess); |
| |
| WaveShaperProcessor* waveShaperProcessor() { return static_cast<WaveShaperProcessor*>(processor()); } |
| |
| // Oversampling. |
| OwnPtr<AudioFloatArray> m_tempBuffer; |
| OwnPtr<AudioFloatArray> m_tempBuffer2; |
| OwnPtr<UpSampler> m_upSampler; |
| OwnPtr<DownSampler> m_downSampler; |
| OwnPtr<UpSampler> m_upSampler2; |
| OwnPtr<DownSampler> m_downSampler2; |
| }; |
| |
| } // namespace WebCore |
| |
| #endif // WaveShaperDSPKernel_h |