cavoc~.c

/* FFTease for Pd */

#include "fftease.h"

static t_class *cavoc_class;

#define OBJECT_NAME "cavoc~"

typedef struct _cavoc
{
    t_object x_obj;
    t_float x_f;
    t_fftease *fft;
    t_float frame_duration;
    int max_bin;

    t_float fundamental;
    short left;
    short right;
    short center;
    short *rule;

    t_float start_breakpoint;
    int hold_frames;
    int frames_left;
    int set_count;
    void *list_outlet;
    t_atom *list_data;
    short mute;
    short external_trigger;
    short trigger_value; // set to 1 when a bang is received

    t_float topfreq; // highest to synthesize - Nyquist by default
    t_float bottomfreq;
    t_float *freqs;
    t_float *amps;
    t_float *cavoc;
    t_float density; // treat as attribute
    t_float hold_time; // treat as attribute
} t_cavoc;

static void *cavoc_new(t_symbol *msg, short argc, t_atom *argv);
static void cavoc_dsp(t_cavoc *x, t_signal **sp);
static t_int *cavoc_perform(t_int *w);
static void cavoc_free( t_cavoc *x );
static int cavoc_apply_rule( short left, short right, short center, short *rule);
static t_float cavoc_randf(t_float min, t_float max);
static void cavoc_rule (t_cavoc *x, t_symbol *msg, short argc, t_atom *argv);
static void cavoc_retune (t_cavoc *x, t_floatarg min, t_floatarg max);
static void cavoc_mute (t_cavoc *x, t_floatarg toggle);
static void cavoc_external_trigger(t_cavoc *x, t_floatarg toggle);
static void cavoc_init(t_cavoc *x);
static void cavoc_bang(t_cavoc *x);
static void cavoc_topfreq(t_cavoc *x, t_floatarg tf);
static void cavoc_oscbank(t_cavoc *x, t_floatarg flag);
static void cavoc_density(t_cavoc *x, t_floatarg f);
static void cavoc_hold_time(t_cavoc *x, t_floatarg f);
static void build_spectrum(t_cavoc *x, t_float min, t_float max);
static void cavoc_bottomfreq(t_cavoc *x, t_floatarg bf);
static void cavoc_fftinfo( t_cavoc *x );


void cavoc_tilde_setup(void)
{
    t_class *c;
    c = class_new(gensym("cavoc~"), (t_newmethod)cavoc_new,
                  (t_method)cavoc_free,sizeof(t_cavoc), 0,A_GIMME,0);
    CLASS_MAINSIGNALIN(c, t_cavoc, x_f);
    class_addmethod(c,(t_method)cavoc_dsp,gensym("dsp"), A_CANT, 0);
    class_addmethod(c,(t_method)cavoc_mute,gensym("mute"),A_FLOAT,0);
    class_addmethod(c,(t_method)cavoc_oscbank,gensym("oscbank"),A_FLOAT,0);
    class_addmethod(c,(t_method)cavoc_rule,gensym("rule"),A_GIMME,0);
    class_addmethod(c,(t_method)cavoc_external_trigger,gensym("external_trigger"),A_FLOAT,0);
    class_addmethod(c,(t_method)cavoc_bang,gensym("bang"),0);
    class_addmethod(c,(t_method)cavoc_retune,gensym("retune"),A_FLOAT,A_FLOAT,0);
    class_addmethod(c,(t_method)cavoc_topfreq,gensym("topfreq"),A_FLOAT,0);
    class_addmethod(c,(t_method)cavoc_bottomfreq,gensym("bottomfreq"),A_FLOAT,0);
    class_addmethod(c,(t_method)cavoc_density,gensym("density"),A_FLOAT,0);
    class_addmethod(c,(t_method)cavoc_hold_time,gensym("hold_time"),A_FLOAT,0);
    cavoc_class = c;
    fftease_announce(OBJECT_NAME);
}


void cavoc_fftinfo( t_cavoc *x )
{
t_fftease *fft = x->fft;
    fftease_fftinfo( fft, OBJECT_NAME );
}

void cavoc_density(t_cavoc *x, t_floatarg density)
{
    int i;
    t_fftease *fft = x->fft;

    if( density < 0.0001 ){
        density = .0001;
    } else if( density > .9999 ){
        density = 1.0;
    }
    x->density = density;
    x->start_breakpoint = 1.0 - x->density;
    for( i = 0; i < fft->N2 + 1; i++ ){
        if( cavoc_randf(0.0, 1.0) > x->start_breakpoint ){
            x->amps[ i ] = 1;
            ++(x->set_count);
        } else {
            x->amps[ i ] = 0;
        }
    }
}

void cavoc_hold_time(t_cavoc *x, t_floatarg f)
{
    if(f <= 0)
        return;
    x->hold_time = f;
    x->hold_frames = (int) ((x->hold_time/1000.0) / x->frame_duration);
    if( x->hold_frames < 1 )
        x->hold_frames = 1;
    x->frames_left = x->hold_frames;
}

void cavoc_external_trigger(t_cavoc *x, t_floatarg toggle)
{
    x->external_trigger = (short)toggle;
}

void cavoc_mute (t_cavoc *x, t_floatarg toggle)
{
    x->mute = (short)toggle;
}

void cavoc_retune(t_cavoc *x, t_floatarg min, t_floatarg max)
{
    if( max <= 0 || min <= 0 || min > max ){
        pd_error(0, "bad values for min and max multipliers");
        return;
    }
    if( min < .1 )
        min = 0.1;
    if( max > 2.0 )
        max = 2.0;
    build_spectrum(x, (t_float)min, (t_float)max);
}



void cavoc_bang(t_cavoc *x)
{
    if(x->external_trigger)
        x->trigger_value = 1;
}

void cavoc_oscbank(t_cavoc *x, t_floatarg flag)
{
    x->fft->obank_flag = (short) flag;
}

void cavoc_rule (t_cavoc *x, t_symbol *msg, short argc, t_atom *argv)
{
    int i;
    short *rule = x->rule;
    if( argc != 8 ){
        pd_error(0, "the rule must be size 8");
        return;
    }

    for( i = 0; i < 8; i++ ){
        rule[i] = (short) atom_getfloatarg(i, argc, argv);
    }
}

void cavoc_free( t_cavoc *x ){
    fftease_free(x->fft);
    free(x->fft);
    free(x->amps);
    free(x->freqs);
    free(x->rule);
}

void *cavoc_new(t_symbol *msg, short argc, t_atom *argv)
{
    t_cavoc *x = (t_cavoc *)pd_new(cavoc_class);
    t_fftease *fft;
    outlet_new(&x->x_obj, gensym("signal"));

    x->fft = (t_fftease *) calloc(1,sizeof(t_fftease));
    fft = x->fft;
    x->fft->initialized = 0;
    x->density = 0.1;
    x->hold_time = 500.0; // convert from ms
    x->fft->obank_flag = 0;
    x->fft->N = FFTEASE_DEFAULT_FFTSIZE;
    x->fft->overlap = FFTEASE_DEFAULT_OVERLAP;
    x->fft->winfac = FFTEASE_DEFAULT_WINFAC;

    if(argc > 0){ fft->N = (int) atom_getfloatarg(0, argc, argv); }
    if(argc > 1){ fft->overlap = (int) atom_getfloatarg(1, argc, argv); }
    if(argc > 2){ x->density = atom_getfloatarg(2, argc, argv); }
    if(argc > 3){ x->hold_time = atom_getfloatarg(3, argc, argv); }

    return x;
}

void cavoc_init(t_cavoc *x)
{
    t_fftease *fft = x->fft;
    short initialized = fft->initialized;
    fftease_init(fft);

    fft->lo_bin = 0;
    fft->hi_bin = fft->N2 - 1;

    if(! fft->R ){
        pd_error(0, "zero sampling rate!");
        return;
    }
    x->frame_duration = (t_float)fft->D/(t_float) fft->R;
    if(x->hold_time <= 0.0)
        x->hold_time = 150;
    x->hold_frames = (int) ((x->hold_time * 0.001) / x->frame_duration) ;
    x->frames_left = x->hold_frames;
    x->trigger_value = 0;
    x->topfreq = fft->R / 2.0;
    x->bottomfreq = 0.0;

    if(!initialized){

        srand(time(0));
        x->mute = 0;

        x->external_trigger = 0;
        if( x->density < 0.0 ){
            x->density = 0;
        } else if( x->density > 1.0 ){
            x->density = 1.0;
        }
        x->start_breakpoint = 1.0 - x->density;
        x->freqs = (t_float *) calloc((fft->N2 + 1), sizeof(t_float));
        x->amps = (t_float *) calloc((fft->N2 + 1), sizeof(t_float));
        x->cavoc = (t_float *) calloc((fft->N + 2), sizeof(t_float));
        x->rule = (short *)  calloc(8, sizeof(short));

        x->rule[2] = x->rule[3] = x->rule[5] = x->rule[6] = 1;
        x->rule[0] = x->rule[1] = x->rule[4] = x->rule[7] = 0;


    } else {
        x->freqs = (t_float *) realloc(x->freqs, (fft->N2 + 1) * sizeof(t_float));
        x->amps = (t_float *) realloc(x->amps, (fft->N2 + 1) * sizeof(t_float));
    }
    build_spectrum(x, 0.9, 1.1);
}


void build_spectrum(t_cavoc *x, t_float min, t_float max)
{
t_fftease *fft = x->fft;
t_float basefreq;
int i;
    x->set_count = 0;
    for(i = 0; i < fft->N2 + 1; i++){
        if(cavoc_randf(0.0, 1.0) > x->start_breakpoint){
            x->amps[i] = 1;
            ++(x->set_count);
        } else {
            x->amps[i] = 0;
        }
        basefreq = x->bottomfreq + (( (x->topfreq - x->bottomfreq) / (t_float) fft->N2 ) * (t_float) i );
        x->freqs[i] = basefreq * cavoc_randf(min,max);
    }
    for( i = 0; i < fft->N2 + 1; i++ ){
        fft->channel[i * 2] = x->amps[i];
        fft->channel[i * 2 + 1] = x->freqs[i];
    }

}

void cavoc_topfreq(t_cavoc *x, t_floatarg tf)
{
    t_fftease *fft = x->fft;
    if(tf < 100 || tf > fft->R / 2.0){
        pd_error(0, "%s: top frequency out of range: %f",OBJECT_NAME,  tf);
        return;
    }
    x->topfreq = (t_float) tf;
    build_spectrum(x, 0.9, 1.1);
}

void cavoc_bottomfreq(t_cavoc *x, t_floatarg bf)
{
    if(bf < 0 && bf > x->topfreq){
        pd_error(0, "%s: bottom frequency out of range: %f",OBJECT_NAME,  bf);
        return;
    }
    x->bottomfreq = (t_float) bf;
    build_spectrum(x, 0.9, 1.1);
}

static void do_cavoc(t_cavoc *x)
{
    int i;
    t_fftease *fft = x->fft;
    int N = fft->N;
    int N2 = fft->N2;
    t_float *channel = fft->channel;
    int hold_frames = x->hold_frames;
    short *rule = x->rule;
    short left = x->left;
    short right = x->right;
    short center = x->center;
    short external_trigger = x->external_trigger;
    short new_event = 0;
    t_float *amps = x->amps;
    t_float *freqs = x->freqs;

    if(external_trigger){// only accurate to within a vector because of FFT
        if(x->trigger_value){
            x->trigger_value = 0;
            new_event = 1;
        }
    } else if(--(x->frames_left) <= 0){
        x->frames_left = hold_frames;
        new_event = 1;
    }
    if(new_event){
        for( i = 1; i < N2; i++ ){
            left = amps[i - 1];
            center = amps[i] ;
            right = amps[i + 1];
            channel[i * 2] = cavoc_apply_rule(left, right, center, rule);
        }
        center = amps[0];
        right = amps[1];
        left = amps[N2];
        channel[0] = cavoc_apply_rule(left, right, center, rule);

        center = amps[N2];
        right = amps[0];
        left = amps[N2 - 1];
        channel[N] = cavoc_apply_rule(left, right, center, rule);
        for(i = 0; i < N2 + 1; i++){
            channel[(i*2) + 1] = freqs[i];
            amps[i] = channel[i * 2];
        }
    }

    if(fft->obank_flag){
        for(i = 0; i < N2 + 1; i++){
            channel[(i*2) + 1] = freqs[i];
            channel[i * 2] = amps[i];
        }
        fftease_oscbank(fft);
    } else {
        fftease_unconvert(fft);
        fftease_rdft(fft, -1);
        fftease_overlapadd(fft);
    }
}


t_int *cavoc_perform(t_int *w)
{
    int i,j;
    t_cavoc *x = (t_cavoc *) (w[1]);
    t_float *MSPOutputVector = (t_float *)(w[2]);
    t_fftease *fft = x->fft;
    int D = fft->D;
    int Nw = fft->Nw;
    t_float *output = fft->output;
    t_float mult = fft->mult ;
    int operationRepeat = fft->operationRepeat;
    int operationCount = fft->operationCount;
    t_float *internalOutputVector = fft->internalOutputVector;
    int MSPVectorSize = fft->MSPVectorSize;

    if(fft->obank_flag){
        mult *= FFTEASE_OSCBANK_SCALAR;
    }

    if( x->mute){
        for(i=0; i < MSPVectorSize; i++){ MSPOutputVector[i] = 0.0; }
        return w+3;
    }

    if( fft->bufferStatus == EQUAL_TO_MSP_VECTOR ){

        do_cavoc(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++ ){
            do_cavoc(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(MSPOutputVector, internalOutputVector + (operationCount * MSPVectorSize), MSPVectorSize * sizeof(t_float));
        operationCount = (operationCount + 1) % operationRepeat;
        if( operationCount == 0 ) {
            do_cavoc(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+3;
}

int cavoc_apply_rule(short left, short right, short center, short *rule){

    if( ! center ){
        if( ! left && ! right){
            return  rule[0];
        } else if ( ! left && right ){
            return rule[1];
        } else if ( left && ! right ) {
            return rule[2];
        } else if (left && right) {
            return rule[3];
        }
    } else {
        if( ! left && ! right){
            return rule[4];
        } else if ( ! left && right ){
            return rule[5];
        } else if ( left && ! right ) {
            return rule[6];
        } else if (left && right) {
            return rule[7];
        }
    }
    return 0;
}

t_float cavoc_randf(t_float min, t_float max)
{
    t_float randv;
    randv = (t_float) (rand() % 32768) / 32768.0 ;
    return (min + ((max-min) * randv))  ;
}

void cavoc_dsp(t_cavoc *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;
    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);
    }
    if(fft->R != samplerate ){
        fft->R = samplerate;
    }
    if(reset_required){
        cavoc_init(x);
    }
    dsp_add(cavoc_perform, 2, x, sp[1]->s_vec);
}