122 lines
3.8 KiB
C++
122 lines
3.8 KiB
C++
#pragma once
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#include <cstdlib>
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namespace trnr {
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// Clipper based on ClipOnly2 by Chris Johnson
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class aw_cliponly2 {
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public:
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aw_cliponly2()
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{
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samplerate = 44100;
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lastSampleL = 0.0;
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wasPosClipL = false;
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wasNegClipL = false;
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lastSampleR = 0.0;
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wasPosClipR = false;
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wasNegClipR = false;
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for (int x = 0; x < 16; x++) {
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intermediateL[x] = 0.0;
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intermediateR[x] = 0.0;
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}
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// this is reset: values being initialized only once. Startup values, whatever they are.
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}
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void set_samplerate(double _samplerate) { samplerate = _samplerate; }
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template <typename t_sample>
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void process_block(t_sample** inputs, t_sample** outputs, long sample_frames)
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{
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t_sample* in1 = inputs[0];
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t_sample* in2 = inputs[1];
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t_sample* out1 = outputs[0];
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t_sample* out2 = outputs[1];
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double overallscale = 1.0;
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overallscale /= 44100.0;
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overallscale *= samplerate;
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int spacing = floor(overallscale); // should give us working basic scaling, usually 2 or 4
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if (spacing < 1) spacing = 1;
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if (spacing > 16) spacing = 16;
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while (--sample_frames >= 0) {
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double inputSampleL = *in1;
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double inputSampleR = *in2;
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// begin ClipOnly2 stereo as a little, compressed chunk that can be dropped into code
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if (inputSampleL > 4.0) inputSampleL = 4.0;
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if (inputSampleL < -4.0) inputSampleL = -4.0;
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if (wasPosClipL == true) { // current will be over
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if (inputSampleL < lastSampleL) lastSampleL = 0.7058208 + (inputSampleL * 0.2609148);
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else lastSampleL = 0.2491717 + (lastSampleL * 0.7390851);
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}
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wasPosClipL = false;
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if (inputSampleL > 0.9549925859) {
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wasPosClipL = true;
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inputSampleL = 0.7058208 + (lastSampleL * 0.2609148);
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}
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if (wasNegClipL == true) { // current will be -over
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if (inputSampleL > lastSampleL) lastSampleL = -0.7058208 + (inputSampleL * 0.2609148);
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else lastSampleL = -0.2491717 + (lastSampleL * 0.7390851);
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}
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wasNegClipL = false;
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if (inputSampleL < -0.9549925859) {
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wasNegClipL = true;
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inputSampleL = -0.7058208 + (lastSampleL * 0.2609148);
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}
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intermediateL[spacing] = inputSampleL;
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inputSampleL = lastSampleL; // Latency is however many samples equals one 44.1k sample
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for (int x = spacing; x > 0; x--) intermediateL[x - 1] = intermediateL[x];
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lastSampleL = intermediateL[0]; // run a little buffer to handle this
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if (inputSampleR > 4.0) inputSampleR = 4.0;
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if (inputSampleR < -4.0) inputSampleR = -4.0;
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if (wasPosClipR == true) { // current will be over
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if (inputSampleR < lastSampleR) lastSampleR = 0.7058208 + (inputSampleR * 0.2609148);
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else lastSampleR = 0.2491717 + (lastSampleR * 0.7390851);
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}
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wasPosClipR = false;
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if (inputSampleR > 0.9549925859) {
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wasPosClipR = true;
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inputSampleR = 0.7058208 + (lastSampleR * 0.2609148);
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}
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if (wasNegClipR == true) { // current will be -over
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if (inputSampleR > lastSampleR) lastSampleR = -0.7058208 + (inputSampleR * 0.2609148);
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else lastSampleR = -0.2491717 + (lastSampleR * 0.7390851);
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}
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wasNegClipR = false;
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if (inputSampleR < -0.9549925859) {
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wasNegClipR = true;
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inputSampleR = -0.7058208 + (lastSampleR * 0.2609148);
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}
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intermediateR[spacing] = inputSampleR;
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inputSampleR = lastSampleR; // Latency is however many samples equals one 44.1k sample
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for (int x = spacing; x > 0; x--) intermediateR[x - 1] = intermediateR[x];
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lastSampleR = intermediateR[0]; // run a little buffer to handle this
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// end ClipOnly2 stereo as a little, compressed chunk that can be dropped into code
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*out1 = inputSampleL;
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*out2 = inputSampleR;
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in1++;
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in2++;
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out1++;
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out2++;
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}
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}
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private:
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double samplerate;
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double lastSampleL;
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double intermediateL[16];
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bool wasPosClipL;
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bool wasNegClipL;
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double lastSampleR;
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double intermediateR[16];
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bool wasPosClipR;
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bool wasNegClipR; // Stereo ClipOnly2
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// default stuff
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};
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} // namespace trnr
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