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25 #ifndef WaveShaperDSPKernel_h
26 #define WaveShaperDSPKernel_h
28 #include "platform/audio/AudioArray.h"
29 #include "platform/audio/AudioDSPKernel.h"
30 #include "platform/audio/DownSampler.h"
31 #include "platform/audio/UpSampler.h"
32 #include "modules/webaudio/WaveShaperProcessor.h"
33 #include "wtf/OwnPtr.h"
37 class WaveShaperProcessor;
39 // WaveShaperDSPKernel is an AudioDSPKernel and is responsible for non-linear distortion on one channel.
41 class WaveShaperDSPKernel final : public AudioDSPKernel {
43 explicit WaveShaperDSPKernel(WaveShaperProcessor*);
46 virtual void process(const float* source, float* dest, size_t framesToProcess) override;
47 virtual void reset() override;
48 virtual double tailTime() const override { return 0; }
49 virtual double latencyTime() const override;
51 // Oversampling requires more resources, so let's only allocate them if needed.
52 void lazyInitializeOversampling();
55 // Apply the shaping curve.
56 void processCurve(const float* source, float* dest, size_t framesToProcess);
58 // Use up-sampling, process at the higher sample-rate, then down-sample.
59 void processCurve2x(const float* source, float* dest, size_t framesToProcess);
60 void processCurve4x(const float* source, float* dest, size_t framesToProcess);
62 WaveShaperProcessor* waveShaperProcessor() { return static_cast<WaveShaperProcessor*>(processor()); }
65 OwnPtr<AudioFloatArray> m_tempBuffer;
66 OwnPtr<AudioFloatArray> m_tempBuffer2;
67 OwnPtr<UpSampler> m_upSampler;
68 OwnPtr<DownSampler> m_downSampler;
69 OwnPtr<UpSampler> m_upSampler2;
70 OwnPtr<DownSampler> m_downSampler2;
75 #endif // WaveShaperDSPKernel_h