/* ========================================
 *  Podcast - Podcast.h
 *  Copyright (c) 2016 airwindows, Airwindows uses the MIT license
 * ======================================== */

#include "Podcast.h"

#ifdef SHR3D_SFX_CORE_AIRWINDOWS

namespace airwinconsolidated::Podcast {

void Podcast::processBlock(float **inputs, float **outputs, int sampleFrames) 
{
    float* in1  =  inputs[0];
    float* in2  =  inputs[1];
    float* out1 = outputs[0];
    float* out2 = outputs[1];

	double overallscale = 1.0;
	overallscale /= 44100.0;
	overallscale *= getSampleRate();
	
	double compress = 1.0 + pow(A,2);
	double wet = B;
	double speed1 = 64.0 / pow(compress,2);
	speed1 *= overallscale;
	double speed2 = speed1 * 1.4;
	double speed3 = speed2 * 1.5;
	double speed4 = speed3 * 1.6;
	double speed5 = speed4 * 1.7;
	double trigger;
    
    while (--sampleFrames >= 0)
    {
		double inputSampleL = *in1;
		double inputSampleR = *in2;
		if (fabs(inputSampleL)<1.18e-23) inputSampleL = fpdL * 1.18e-17;
		if (fabs(inputSampleR)<1.18e-23) inputSampleR = fpdR * 1.18e-17;
		double drySampleL = inputSampleL;
		double drySampleR = inputSampleR;
				
		inputSampleL *= c1L;
		trigger = fabs(inputSampleL)*4.7;
		if (trigger > 4.7) trigger = 4.7;
		trigger = sin(trigger);
		if (trigger < 0) trigger *= 8.0;
		if (trigger < -4.2) trigger = -4.2;
		c1L += trigger/speed5;
		if (c1L > compress) c1L = compress;
		//compress stage
		inputSampleR *= c1R;
		trigger = fabs(inputSampleR)*4.7;
		if (trigger > 4.7) trigger = 4.7;
		trigger = sin(trigger);
		if (trigger < 0) trigger *= 8.0;
		if (trigger < -4.2) trigger = -4.2;
		c1R += trigger/speed5;
		if (c1R > compress) c1R = compress;
		//compress stage
				
		inputSampleL *= c2L;
		trigger = fabs(inputSampleL)*4.7;
		if (trigger > 4.7) trigger = 4.7;
		trigger = sin(trigger);
		if (trigger < 0) trigger *= 8.0;
		if (trigger < -4.2) trigger = -4.2;
		c2L += trigger/speed4;
		if (c2L > compress) c2L = compress;
		//compress stage
		inputSampleR *= c2R;
		trigger = fabs(inputSampleR)*4.7;
		if (trigger > 4.7) trigger = 4.7;
		trigger = sin(trigger);
		if (trigger < 0) trigger *= 8.0;
		if (trigger < -4.2) trigger = -4.2;
		c2R += trigger/speed4;
		if (c2R > compress) c2R = compress;
		//compress stage
		
		inputSampleL *= c3L;
		trigger = fabs(inputSampleL)*4.7;
		if (trigger > 4.7) trigger = 4.7;
		trigger = sin(trigger);
		if (trigger < 0) trigger *= 8.0;
		if (trigger < -4.2) trigger = -4.2;
		c3L += trigger/speed3;
		if (c3L > compress) c3L = compress;
		//compress stage
		inputSampleR *= c3R;
		trigger = fabs(inputSampleR)*4.7;
		if (trigger > 4.7) trigger = 4.7;
		trigger = sin(trigger);
		if (trigger < 0) trigger *= 8.0;
		if (trigger < -4.2) trigger = -4.2;
		c3R += trigger/speed3;
		if (c3R > compress) c3R = compress;
		//compress stage
				
		inputSampleL *= c4L;
		trigger = fabs(inputSampleL)*4.7;
		if (trigger > 4.7) trigger = 4.7;
		trigger = sin(trigger);
		if (trigger < 0) trigger *= 8.0;
		if (trigger < -4.2) trigger = -4.2;
		c4L += trigger/speed2;
		if (c4L > compress) c4L = compress;
		//compress stage
		inputSampleR *= c4R;
		trigger = fabs(inputSampleR)*4.7;
		if (trigger > 4.7) trigger = 4.7;
		trigger = sin(trigger);
		if (trigger < 0) trigger *= 8.0;
		if (trigger < -4.2) trigger = -4.2;
		c4R += trigger/speed2;
		if (c4R > compress) c4R = compress;
		//compress stage
				
		inputSampleL *= c5L;
		trigger = fabs(inputSampleL)*4.7;
		if (trigger > 4.7) trigger = 4.7;
		trigger = sin(trigger);
		if (trigger < 0) trigger *= 8.0;
		if (trigger < -4.2) trigger = -4.2;
		c5L += trigger/speed1;
		if (c5L > compress) c5L = compress;
		//compress stage
		inputSampleR *= c5R;
		trigger = fabs(inputSampleR)*4.7;
		if (trigger > 4.7) trigger = 4.7;
		trigger = sin(trigger);
		if (trigger < 0) trigger *= 8.0;
		if (trigger < -4.2) trigger = -4.2;
		c5R += trigger/speed1;
		if (c5R > compress) c5R = compress;
		//compress stage
		
		if (compress > 1.0) {
			inputSampleL /= compress;
			inputSampleR /= compress;
		}
		
		if (wet !=1.0) {
			inputSampleL = (inputSampleL * wet) + (drySampleL * (1.0-wet));
			inputSampleR = (inputSampleR * wet) + (drySampleR * (1.0-wet));
		}
		
		if (inputSampleL > 0.999) inputSampleL = 0.999;
		if (inputSampleL < -0.999) inputSampleL = -0.999;
		if (inputSampleR > 0.999) inputSampleR = 0.999;
		if (inputSampleR < -0.999) inputSampleR = -0.999;

		//begin 32 bit stereo floating point dither
		int expon; frexpf((float)inputSampleL, &expon);
		fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
		inputSampleL += double((double(fpdL)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2.0,expon+62.0));
		frexpf((float)inputSampleR, &expon);
		fpdR ^= fpdR << 13; fpdR ^= fpdR >> 17; fpdR ^= fpdR << 5;
		inputSampleR += double((double(fpdR)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2.0,expon+62.0));
		//end 32 bit stereo floating point dither
		
		*out1 = float(inputSampleL);
		*out2 = float(inputSampleR);

		in1++;
		in2++;
		out1++;
		out2++;
    }
}

} // end namespace

#endif // SHR3D_SFX_CORE_AIRWINDOWS
