/* FFTease for Pd */

#include "fftease.h"

static t_class *leaker_class;

#define OBJECT_NAME "leaker~"

typedef struct _leaker

} t_leaker;

static void leaker_dsp(t_leaker *x, t_signal **sp);

static t_int *leaker_perform(t_int *w);

static void leaker_free(t_leaker *x);

static void *leaker_new(t_symbol *msg, short argc, t_atom *argv);

static void leaker_upsieve(t_leaker *x) ;

static void leaker_downsieve(t_leaker *x) ;

static void leaker_randsieve(t_leaker *x) ;

static void leaker_mute(t_leaker *x, t_floatarg state);

static void leaker_init(t_leaker *x);

void leaker_tilde_setup(void)

{

t_class *c;

c = class_new(gensym("leaker~"), (t_newmethod)leaker_new,

(t_method)leaker_free,sizeof(t_leaker), 0,A_GIMME,0);

CLASS_MAINSIGNALIN(c, t_leaker, x_f);

class_addmethod(c,(t_method)leaker_dsp,gensym("dsp"), A_CANT, 0);

class_addmethod(c,(t_method)leaker_mute,gensym("mute"),A_FLOAT,0);

class_addmethod(c,(t_method)leaker_upsieve,gensym("upsieve"), 0);

class_addmethod(c,(t_method)leaker_downsieve,gensym("downsieve"), 0);

class_addmethod(c,(t_method)leaker_randsieve,gensym("randsieve"), 0);

leaker_class = c;

fftease_announce(OBJECT_NAME);

}

void leaker_free( t_leaker *x ){

fftease_free(x->fft);

fftease_free(x->fft2);

free(x->fft);

free(x->fft2);

free(x->sieve);

}

void leaker_upsieve(t_leaker *x) {

int i;

int *sieve = x->sieve;

for( i = 0; i < x->fft->N2; i++ ){

sieve[i] = i + 1;

}

}

void leaker_downsieve(t_leaker *x) {

int i;

int *sieve = x->sieve;

int N2 = x->fft->N2;

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

sieve[i] = N2 - i;

}

}

void leaker_randsieve(t_leaker *x) {

int i;

int temp;

int pos1, pos2;

int N2 = x->fft->N2;

int *sieve = x->sieve;

int maxswap = N2 - 1;

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

sieve[i] = i + 1;

}

while(maxswap > 0){

pos1 = maxswap;

pos2 = rand() % (N2 - 1);

temp = sieve[pos1];

sieve[pos1] = sieve[pos2];

sieve[pos2] = temp;

--maxswap;

}

}

void leaker_mute(t_leaker *x, t_floatarg state)

{

x->mute = (short)state;

}

void *leaker_new(t_symbol *msg, short argc, t_atom *argv)

{

t_fftease *fft, *fft2;

t_leaker *x = (t_leaker *)pd_new(leaker_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;

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;

return x;

}

void leaker_init(t_leaker *x)

{

int i;

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;

x->fade_value = 0;

x->sieve = (int *) calloc((fft->N2 + 1),sizeof(int));

}

if(initialized != 2){

for(i = 0; i < fft->N2; i++){

x->sieve[i] = i;

}

}

}

static void do_leaker(t_leaker *x)

{

int i,odd,even;

t_float a1,a2,b1,b2;

t_fftease *fft = x->fft;

t_fftease *fft2 = x->fft2;

int N2 = fft->N2;

t_float *buffer1 = fft->buffer;

t_float *buffer2 = fft2->buffer;

t_float *channel1 = fft->channel;

int *sieve = x->sieve;

t_float fade_value = x->fade_value;

fftease_fold(fft);

fftease_fold(fft2);

fftease_rdft(fft,1);

fftease_rdft(fft2,1);

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

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

if( fade_value <= 0 || fade_value < sieve[i] ){

a1 = ( i == N2 ? *(buffer1+1) : *(buffer1+even) );

b1 = ( i == 0 || i == N2 ? 0. : *(buffer1+odd) );

*(channel1+even) = hypot( a1, b1 ) ;

*(channel1+odd) = -atan2( b1, a1 );

*(buffer1+even) = *(channel1+even) * cos(*(channel1+odd));

if ( i != N2 ){

*(buffer1+odd) = -(*(channel1+even)) * sin(*(channel1+odd));

}

} else {

a2 = ( i == N2 ? *(buffer2+1) : *(buffer2+even) );

b2 = ( i == 0 || i == N2 ? 0. : *(buffer2+odd) );

*(channel1+even) = hypot( a2, b2 ) ;

*(channel1+odd) = -atan2( b2, a2 );

*(buffer1+even) = *(channel1+even) * cos(*(channel1+odd) );

if ( i != N2 ){

*(buffer1+odd) = -(*(channel1+even)) * sin( *(channel1+odd) );

}

}

}

fftease_rdft(fft,-1);

fftease_overlapadd(fft);

}

t_int *leaker_perform(t_int *w)

{

int i,j;

t_leaker *x = (t_leaker *) (w[1]);

t_float *MSPInputVector1 = (t_float *)(w[2]);

t_float *MSPInputVector2 = (t_float *)(w[3]);

t_float *fade_value = (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;

int N2 = fft->N2;

x->fade_value = *fade_value * (float) N2;

if(x->mute){

for(i=0; i < MSPVectorSize; i++){ MSPOutputVector[i] = 0.0; }

return w+6;

}

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_leaker(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_leaker(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_leaker(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 leaker_dsp(t_leaker *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){

leaker_init(x);

}

if(fftease_msp_sanity_check(fft,OBJECT_NAME)) {

dsp_add(leaker_perform, 5, x, sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec,sp[3]->s_vec);

}

}