conv
Files: conv.h, conv.c
Partioned convolution.
This module will perform partitioned convolution on an input signal using
an ftable as an impulse response.
sp_conv_create(sp_conv **conv)
sp_conv_init(sp_data *sp, sp_conv *conv, sp_ftbl *ft, SPFLOAT iPartLen)
sp_conv_compute(sp_data *sp, sp_conv *conv, SPFLOAT *input, SPFLOAT *out)
sp_conv_destroy(sp_conv **conv)
Mandatory Parameters
ft: Ftable used as the impulse response.
(Recommended value: N/A)
iPartLen: Partition length (in samples).
Must be a power of 2. Lower values will add less latency, at the cost
of requiring more CPU power.
(Recommended value: 2048)
Inputs
input: Signal input to be convolved.
Outputs
out: Signal output.
Example Code
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include "soundpipe.h"
typedef struct {
sp_diskin *diskin;
sp_conv *conv;
sp_ftbl *ft;
} UserData;
void process(sp_data *sp, void *udata) {
UserData *ud = udata;
SPFLOAT conv = 0, diskin = 0, bal = 0;
sp_diskin_compute(sp, ud->diskin, NULL, &diskin);
sp_conv_compute(sp, ud->conv, &diskin, &conv);
sp->out[0] = conv * 0.05;
}
int main() {
srand(1234567);
UserData ud;
sp_data *sp;
sp_create(&sp);
sp_diskin_create(&ud.diskin);
sp_conv_create(&ud.conv);
sp_ftbl_loadfile(sp, &ud.ft, "imp.wav");
sp_diskin_init(sp, ud.diskin, "oneart.wav");
sp_conv_init(sp, ud.conv, ud.ft, 8192);
sp->len = 44100 * 5;
sp_process(sp, &ud, process);
sp_conv_destroy(&ud.conv);
sp_ftbl_destroy(&ud.ft);
sp_diskin_destroy(&ud.diskin);
sp_destroy(&sp);
return 0;
}