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f390fd1723
* ReverbSC: Method to change samplerate (#3401) * ReverbSC: added mutex for protected malloc * ReverbSC: small CMake fix to remove warning message * ReverbSC: samplerate changed to uint32_t. more CMakeFile tweaks * Fix dc block on oversampling
54 lines
1.1 KiB
C
54 lines
1.1 KiB
C
/*
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* DCblock
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*
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* This code has been extracted from the Csound opcode "dcblock".
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* It has been modified to work as a Soundpipe module.
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*
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* Original Author(s): Perry R. Cook
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* Year: 1995
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* Location: Opcodes/biquad.c
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*
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*/
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#include <math.h>
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#include <stdlib.h>
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#include "base.h"
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#include "dcblock.h"
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int sp_dcblock_create(sp_dcblock **p)
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{
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*p = malloc(sizeof(sp_dcblock));
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return SP_OK;
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}
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int sp_dcblock_destroy(sp_dcblock **p)
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{
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free(*p);
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return SP_OK;
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}
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int sp_dcblock_init(sp_data *sp, sp_dcblock *p, int oversampling )
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{
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p->outputs = 0.0;
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p->inputs = 0.0;
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p->gain = pow( 0.99, 1.0f / oversampling );
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if (p->gain == 0.0 || p->gain>=1.0 || p->gain<=-1.0)
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p->gain = 0.99;
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return SP_OK;
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}
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int sp_dcblock_compute(sp_data *sp, sp_dcblock *p, SPFLOAT *in, SPFLOAT *out)
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{
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SPFLOAT gain = p->gain;
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SPFLOAT outputs = p->outputs;
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SPFLOAT inputs = p->inputs;
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SPFLOAT sample = *in;
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outputs = sample - inputs + (gain * outputs);
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inputs = sample;
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*out = outputs;
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p->outputs = outputs;
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p->inputs = inputs;
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return SP_OK;
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}
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