root/modules/audio_filter/spatializer/revmodel.cpp

// Reverb model implementation
//
//
// Google Summer of Code 2007
//
// Authors: Biodun Osunkunle <biodun@videolan.org>
//
// Mentor : Jean-Baptiste Kempf <jb@videolan.org>
//
// Original written by Jezar at Dreampoint, June 2000

// This code is public domain

#include "revmodel.hpp"
#include <stdlib.h>

revmodel::revmodel()
{
    // Tie the components to their buffers
    combL[0].setbuffer(bufcombL1,combtuningL1);
    combR[0].setbuffer(bufcombR1,combtuningR1);
    combL[1].setbuffer(bufcombL2,combtuningL2);
    combR[1].setbuffer(bufcombR2,combtuningR2);
    combL[2].setbuffer(bufcombL3,combtuningL3);
    combR[2].setbuffer(bufcombR3,combtuningR3);
    combL[3].setbuffer(bufcombL4,combtuningL4);
    combR[3].setbuffer(bufcombR4,combtuningR4);
    combL[4].setbuffer(bufcombL5,combtuningL5);
    combR[4].setbuffer(bufcombR5,combtuningR5);
    combL[5].setbuffer(bufcombL6,combtuningL6);
    combR[5].setbuffer(bufcombR6,combtuningR6);
    combL[6].setbuffer(bufcombL7,combtuningL7);
    combR[6].setbuffer(bufcombR7,combtuningR7);
    combL[7].setbuffer(bufcombL8,combtuningL8);
    combR[7].setbuffer(bufcombR8,combtuningR8);
    allpassL[0].setbuffer(bufallpassL1,allpasstuningL1);
    allpassR[0].setbuffer(bufallpassR1,allpasstuningR1);
    allpassL[1].setbuffer(bufallpassL2,allpasstuningL2);
    allpassR[1].setbuffer(bufallpassR2,allpasstuningR2);
    allpassL[2].setbuffer(bufallpassL3,allpasstuningL3);
    allpassR[2].setbuffer(bufallpassR3,allpasstuningR3);
    allpassL[3].setbuffer(bufallpassL4,allpasstuningL4);
    allpassR[3].setbuffer(bufallpassR4,allpasstuningR4);

    // Set default values
    allpassL[0].setfeedback(0.5f);
    allpassR[0].setfeedback(0.5f);
    allpassL[1].setfeedback(0.5f);
    allpassR[1].setfeedback(0.5f);
    allpassL[2].setfeedback(0.5f);
    allpassR[2].setfeedback(0.5f);
    allpassL[3].setfeedback(0.5f);
    allpassR[3].setfeedback(0.5f);
    setwet(initialwet);
    setroomsize(initialroom);
    setdry(initialdry);
    setdamp(initialdamp);
    setwidth(initialwidth);
    setmode(initialmode);

    // Buffer will be full of rubbish - so we MUST mute them
    mute();
}

void revmodel::mute()
{
    int i;
    if (getmode() >= freezemode)
        return;

    for (i = 0 ; i < numcombs ; i++)
    {
        combL[i].mute();
        combR[i].mute();
    }
    for (i=0;i<numallpasses;i++)
    {
        allpassL[i].mute();
        allpassR[i].mute();
    }
}

/*****************************************************************************
 *  Transforms the audio stream
 * /param float *inputL     input buffer
 * /param float *outputL   output buffer
 * /param long numsamples  number of samples to be processed
 * /param int skip             number of channels in the audio stream
 *****************************************************************************/
void revmodel::processreplace(float *inputL, float *outputL, long numsamples, int skip)
{
    float outL,outR,input;
    float inputR;
    int i;

    outL = outR = 0;
        /* TODO this module supports only 2 audio channels, let's improve this */
        if (skip > 1)
           inputR = inputL[1];
        else
           inputR = inputL[0];
        input = (inputL[0] + inputR) * gain;

        // Accumulate comb filters in parallel
        for(i=0; i<numcombs; i++)
        {
            outL += combL[i].process(input);
            outR += combR[i].process(input);
        }

        // Feed through allpasses in series
        for(i=0; i<numallpasses; i++)
        {
            outL = allpassL[i].process(outL);
            outR = allpassR[i].process(outR);
        }

        // Calculate output REPLACING anything already there
        outputL[0] = (outL*wet1 + outR*wet2 + inputR*dry);
           if (skip > 1)
        outputL[1] = (outR*wet1 + outL*wet2 + inputR*dry);
}

void revmodel::processmix(float *inputL, float *outputL, long numsamples, int skip)
{
    float outL,outR,input;
    float inputR;
    int i;

    outL = outR = 0;
        if (skip > 1)
           inputR = inputL[1];
        else
           inputR = inputL[0];
        input = (inputL[0] + inputR) * gain;

        // Accumulate comb filters in parallel
        for(i=0; i<numcombs; i++)
        {
            outL += combL[i].process(input);
            outR += combR[i].process(input);
        }

        // Feed through allpasses in series
        for(i=0; i<numallpasses; i++)
        {
            outL = allpassL[i].process(outL);
            outR = allpassR[i].process(outR);
        }

        // Calculate output REPLACING anything already there
        outputL[0] += (outL*wet1 + outR*wet2 + inputR*dry);
           if (skip > 1)
        outputL[1] += (outR*wet1 + outL*wet2 + inputR*dry);
}

void revmodel::update()
{
// Recalculate internal values after parameter change

    int i;

    wet1 = wet*(width/2 + 0.5f);
    wet2 = wet*((1-width)/2);

    if (mode >= freezemode)
    {
        roomsize1 = 1;
        damp1 = 0;
        gain = muted;
    }
    else
    {
        roomsize1 = roomsize;
        damp1 = damp;
        gain = fixedgain;
    }

    for(i=0; i<numcombs; i++)
    {
        combL[i].setfeedback(roomsize1);
        combR[i].setfeedback(roomsize1);
    }

    for(i=0; i<numcombs; i++)
    {
        combL[i].setdamp(damp1);
        combR[i].setdamp(damp1);
    }
}

// The following get/set functions are not inlined, because
// speed is never an issue when calling them, and also
// because as you develop the reverb model, you may
// wish to take dynamic action when they are called.

void revmodel::setroomsize(float value)
{
    roomsize = (value*scaleroom) + offsetroom;
    update();
}

float revmodel::getroomsize()
{
    return (roomsize-offsetroom)/scaleroom;
}

void revmodel::setdamp(float value)
{
    damp = value*scaledamp;
    update();
}

float revmodel::getdamp()
{
    return damp/scaledamp;
}

void revmodel::setwet(float value)
{
    wet = value*scalewet;
    update();
}

float revmodel::getwet()
{
    return wet/scalewet;
}

void revmodel::setdry(float value)
{
    dry = value*scaledry;
}

float revmodel::getdry()
{
    return dry/scaledry;
}

void revmodel::setwidth(float value)
{
    width = value;
    update();
}

float revmodel::getwidth()
{
    return width;
}

void revmodel::setmode(float value)
{
    mode = value;
    update();
}

float revmodel::getmode()
{
    if (mode >= freezemode)
        return 1;
    else
        return 0;
}

//ends