shapee~.c

/* FFTease for Pd */

#include "fftease.h"

static t_class *shapee_class;

#define OBJECT_NAME "shapee~"

typedef struct _shapee
{
    t_object x_obj;
    t_float x_f;
    t_fftease *fft,*fft2;
    int widthConnected;
    t_float shapeWidth;
    short mute;
} t_shapee;


/* msp function prototypes */

static void *shapee_new(t_symbol *s, int argc, t_atom *argv);
static void shapee_init(t_shapee *x);
static void shapee_mute(t_shapee *x, t_floatarg state);
static void shapee_free(t_shapee *x);
static void shapee_dsp(t_shapee *x, t_signal **sp);
static t_int *shapee_perform(t_int *w);

void shapee_tilde_setup(void)
{
    t_class *c;
    c = class_new(gensym("shapee~"), (t_newmethod)shapee_new,
                  (t_method)shapee_free,sizeof(t_shapee), 0,A_GIMME,0);
    CLASS_MAINSIGNALIN(c, t_shapee, x_f);
    class_addmethod(c,(t_method)shapee_dsp,gensym("dsp"), A_CANT, 0);
    class_addmethod(c,(t_method)shapee_mute,gensym("mute"),A_FLOAT,0);
    shapee_class = c;
    fftease_announce(OBJECT_NAME);
}

void *shapee_new(t_symbol *s, int argc, t_atom *argv)
{

    t_fftease *fft, *fft2;
    t_shapee *x = (t_shapee *)pd_new(shapee_class);

    inlet_new(&x->x_obj, &x->x_obj.ob_pd,gensym("signal"), gensym("signal"));
    inlet_new(&x->x_obj, &x->x_obj.ob_pd,gensym("signal"), gensym("signal"));
    outlet_new(&x->x_obj, gensym("signal"));
    x->fft = (t_fftease *) calloc(1,sizeof(t_fftease));
    x->fft2 = (t_fftease *) calloc(1,sizeof(t_fftease));
    fft = x->fft;
    fft2 = x->fft2;
    fft->initialized = 0;
    fft2->initialized = 0;
    /* INITIALIZATIONS */
    fft->N = FFTEASE_DEFAULT_FFTSIZE;
    fft->overlap = FFTEASE_DEFAULT_OVERLAP;
    fft->winfac = FFTEASE_DEFAULT_WINFAC;
    fft2->N = FFTEASE_DEFAULT_FFTSIZE;
    fft2->overlap = FFTEASE_DEFAULT_OVERLAP;
    fft2->winfac = FFTEASE_DEFAULT_WINFAC;

    fft2->R = fft->R = sys_getsr();
    fft2->MSPVectorSize = fft->MSPVectorSize = sys_getblksize();
    x->shapeWidth = 2.0;
    if(argc > 0){ fft->N = fft2->N = (int) atom_getfloatarg(0, argc, argv); }
    if(argc > 1){ fft->overlap = fft2->overlap = (int) atom_getfloatarg(1, argc, argv); }
    return x;
}

void shapee_init(t_shapee *x)
{
    t_fftease *fft = x->fft;
    t_fftease *fft2 = x->fft2;
    short initialized = fft->initialized;

    fftease_init(fft);
    fftease_init(fft2);
    if(!initialized){
        x->mute = 0;
    }
}

void shapee_mute(t_shapee *x, t_floatarg state)
{
    x->mute = (short)state;
}

static void do_shapee(t_shapee *x)
{
    t_fftease *fft = x->fft;
    t_fftease *fft2 = x->fft2;
    int
    i,j,
    N,
    N2,
    remainingWidth,
    even, odd;


    t_float
    a1, b1,
    a2, b2,
    *bufferOne,
    *bufferTwo,
    *channelOne,
    *channelTwo;


    int shapeWidth = (int) x->shapeWidth;

    bufferOne = fft->buffer;
    bufferTwo = fft2->buffer;
    N = fft->N;
    N2 = fft->N2;

    channelOne = fft->channel;
    channelTwo = fft2->channel;

    if(shapeWidth < 1 || shapeWidth > N2)
        shapeWidth = 1;

    /* apply hamming window and fold our window buffer into the fft buffer */

    fftease_fold(fft);
    fftease_fold(fft2);

    /* do an fft */

    fftease_rdft(fft,FFT_FORWARD);
    fftease_rdft(fft2,FFT_FORWARD);

    /* convert to polar coordinates from complex values */

    for ( i = 0; i <= N2; i++ ) {
        odd = ( even = i<<1 ) + 1;

        a1 = ( i == N2 ? *(bufferOne+1) : *(bufferOne+even) );
        b1 = ( i == 0 || i == N2 ? 0. : *(bufferOne+odd) );

        a2 = ( i == N2 ? *(bufferTwo+1) : *(bufferTwo+even) );
        b2 = ( i == 0 || i == N2 ? 0. : *(bufferTwo+odd) );

        /* replace signal one's phases with those of signal two */

        *(channelOne+even) = hypot( a1, b1 );
        *(channelOne+odd) = -atan2( b1, a1 );

        *(channelTwo+even) = hypot( a2, b2 );
        *(channelTwo+odd) = -atan2( b2, a2 );
    }

    /* constrain our shapeWidth value */

    if ( shapeWidth > N2 )
        shapeWidth = N2;

    if ( shapeWidth < 1 )
        shapeWidth = 1;


    /* lets just shape the entire signal by the shape width */

    for ( i=0; i < N; i += shapeWidth << 1 ) {

        t_float       amplSum = 0.,
        freqSum = 0.,
        factor;

        for ( j = 0; j < shapeWidth << 1; j += 2 ) {
            if( i+j >= N+2 ){
                // post("shapee~: index out of range ");
            } else {
                amplSum += *(channelTwo+i+j);
                freqSum += *(channelOne+i+j);
            }
        }
        if(freqSum <= 0.001){
            freqSum = 1.0;
        }
        if (amplSum < 0.000000001){
            factor = 0.000000001;
        } else {
            factor = amplSum / freqSum;
        }
        for ( j = 0; j < shapeWidth * 2; j += 2 ){
            if( i+j >= N+2 ){
                //  post("shapee~: index out of range ");
            } else {
                *(channelOne+i+j) *= factor;
            }
        }
    }

    /* copy remaining magnitudes */

    if ( (remainingWidth = N2 % shapeWidth) ) {

        int         bindex = (N2 - remainingWidth) << 1;


        t_float       amplSum = 0.,
        freqSum = 0.,
        factor;

        for ( j = 0; j < remainingWidth * 2; j += 2 ) {
            if( bindex+j >= N+2 ){
                //  post("shapee~: index out of range ")
            } else {
                amplSum += *(channelTwo+bindex+j);
                freqSum += *(channelOne+bindex+j);
            }
        }
        if(freqSum <= 0.00001){
            freqSum = 1.0;
        }
        if (amplSum < 0.000000001){
            factor = 0.000000001;
        } else{
            factor = amplSum / freqSum;
        }
        for ( j = 0; j < remainingWidth * 2; j += 2 ){
            if( bindex+j >= N+2 ){
                // post("shapee~: index out of range ");
            } else {
                *(channelOne+bindex+j) *= factor;
            }
        }
    }


    /* convert from polar to cartesian */

    for ( i = 0; i <= N2; i++ ) {

        odd = ( even = i<<1 ) + 1;

        *(bufferOne+even) = *(channelOne+even) * cos( *(channelOne+odd) );

        if ( i != N2 )
            *(bufferOne+odd) = (*(channelOne+even)) * -sin( *(channelOne+odd) );
    }

    fftease_rdft(fft,FFT_INVERSE);
    fftease_overlapadd(fft);
}


t_int *shapee_perform(t_int *w)
{
    int i,j;
    /* get our inlets and outlets */
    t_shapee *x = (t_shapee *) (w[1]);
    t_float *MSPInputVector1 = (t_float *)(w[2]);
    t_float *MSPInputVector2 = (t_float *)(w[3]);
    t_float *inShape = (t_float *)(w[4]);
    t_float *MSPOutputVector = (t_float *)(w[5]);

    t_fftease *fft = x->fft;
    t_fftease *fft2 = x->fft2;

    int MSPVectorSize = fft->MSPVectorSize;
    int operationRepeat = fft->operationRepeat;
    int operationCount = fft->operationCount;
    t_float *internalInputVector1 = fft->internalInputVector;
    t_float *internalInputVector2 = fft2->internalInputVector;
    t_float *internalOutputVector = fft->internalOutputVector;
    t_float *inputOne = fft->input;
    t_float *inputTwo = fft2->input;
    t_float *output = fft->output;
    int D = fft->D;
    int Nw = fft->Nw;
    t_float mult = fft->mult;

    if(x->mute){
        for(i=0; i < MSPVectorSize; i++){ MSPOutputVector[i] = 0.0; }
        return w+6;
    }

    x->shapeWidth =   *inShape;

    if( fft->bufferStatus == EQUAL_TO_MSP_VECTOR ){
        memcpy(inputOne, inputOne + D, (Nw - D) * sizeof(t_float));
        memcpy(inputOne + (Nw - D), MSPInputVector1, D * sizeof(t_float));
        memcpy(inputTwo, inputTwo + D, (Nw - D) * sizeof(t_float));
        memcpy(inputTwo + (Nw - D), MSPInputVector2, D * sizeof(t_float));

        do_shapee(x);

        for ( j = 0; j < D; j++ ){ *MSPOutputVector++ = output[j] * mult; }
        memcpy(output, output + D, (Nw-D) * sizeof(t_float));
        for(j = (Nw-D); j < Nw; j++){ output[j] = 0.0; }
    }
    else if( fft->bufferStatus == SMALLER_THAN_MSP_VECTOR ) {
        for( i = 0; i < operationRepeat; i++ ){
            memcpy(inputOne, inputOne + D, (Nw - D) * sizeof(t_float));
            memcpy(inputOne + (Nw-D), MSPInputVector1 + (D*i), D * sizeof(t_float));
            memcpy(inputTwo, inputTwo + D, (Nw - D) * sizeof(t_float));
            memcpy(inputTwo + (Nw-D), MSPInputVector2 + (D*i), D * sizeof(t_float));

            do_shapee(x);

            for ( j = 0; j < D; j++ ){ *MSPOutputVector++ = output[j] * mult; }
            memcpy(output, output + D, (Nw-D) * sizeof(t_float));
            for(j = (Nw-D); j < Nw; j++){ output[j] = 0.0; }
        }
    }
    else if( fft->bufferStatus == BIGGER_THAN_MSP_VECTOR ) {
        memcpy(internalInputVector1 + (operationCount * MSPVectorSize), MSPInputVector1, MSPVectorSize * sizeof(t_float));
        memcpy(internalInputVector2 + (operationCount * MSPVectorSize), MSPInputVector2, MSPVectorSize * sizeof(t_float));
        memcpy(MSPOutputVector, internalOutputVector + (operationCount * MSPVectorSize), MSPVectorSize * sizeof(t_float));

        operationCount = (operationCount + 1) % operationRepeat;

        if( operationCount == 0 ) {
            memcpy(inputOne, inputOne + D, (Nw - D) * sizeof(t_float));
            memcpy(inputOne + (Nw - D), internalInputVector1, D * sizeof(t_float));
            memcpy(inputTwo, inputTwo + D, (Nw - D) * sizeof(t_float));
            memcpy(inputTwo + (Nw - D), internalInputVector2, D * sizeof(t_float));

            do_shapee(x);

            for ( j = 0; j < D; j++ ){ internalOutputVector[j] = output[j] * mult; }
            memcpy(output, output + D, (Nw - D) * sizeof(t_float));
            for(j = (Nw-D); j < Nw; j++){ output[j] = 0.0; }
        }
        fft->operationCount = operationCount;
    }
    return w+6;
}

void shapee_free( t_shapee *x )
{
    fftease_free(x->fft);
    fftease_free(x->fft2);
    free(x->fft);
    free(x->fft2);
}

void shapee_dsp(t_shapee *x, t_signal **sp)
{
    int reset_required = 0;
    int maxvectorsize = sp[0]->s_n;
    int samplerate = sp[0]->s_sr;

    t_fftease *fft = x->fft;
    t_fftease *fft2 = x->fft2;

    if(fft->R != samplerate || fft->MSPVectorSize != maxvectorsize || fft->initialized == 0){
        reset_required = 1;
    }
    if(!samplerate)
        return;

    if(fft->MSPVectorSize != maxvectorsize){
        fft->MSPVectorSize = maxvectorsize;
        fftease_set_fft_buffers(fft);
        fft2->MSPVectorSize = maxvectorsize;
        fftease_set_fft_buffers(fft2);
    }
    if(fft->R != samplerate ){
        fft->R = samplerate;
        fft2->R = samplerate;
    }
    if(reset_required){
        shapee_init(x);
    }
    if(fftease_msp_sanity_check(fft,OBJECT_NAME)) {
        dsp_add(shapee_perform, 5, x, sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec,sp[3]->s_vec);
    }
}