Branch
Hash :
adb9e235
Author :
Thomas de Grivel
Date :
2023-01-14T18:26:30
license
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/* rtbuf
* Copyright 2018-2023 kmx.io <contact@kmx.io>
*
* Permission is hereby granted to use this software excepted
* on Apple computers granted the above copyright notice and
* this permission paragraph are included in all copies and
* substantial portions of this software.
*
* THIS SOFTWARE IS PROVIDED "AS-IS" WITHOUT ANY GUARANTEE OF
* PURPOSE AND PERFORMANCE. IN NO EVENT WHATSOEVER SHALL THE
* AUTHOR BE CONSIDERED LIABLE FOR THE USE AND PERFORMANCE OF
* THIS SOFTWARE.
*/
#include <math.h>
#include "../../librtbuf/rtbuf.h"
#include "../../librtbuf/lib.h"
#include "../signal.h"
#include "../signal_type.h"
s_rtbuf_lib_proc_in rtbuf_signal_hipass_in[] =
{{ "signal", RTBUF_SIGNAL_TYPE, 0.0, -1.0, 1.0, 1.0 },
{ "cutoff", RTBUF_SIGNAL_TYPE, 8000.0, 1.0, RTBUF_SIGNAL_SAMPLERATE / 2.0, 2.0 },
{ 0, 0, 0.0, 0.0, 0.0, 0.0 }};
s_rtbuf_lib_proc_out rtbuf_signal_hipass_out[] =
{{ "signal", RTBUF_SIGNAL_TYPE },
{ "x", RTBUF_SIGNAL_SAMPLE_TYPE },
{ "y", RTBUF_SIGNAL_SAMPLE_TYPE },
{ 0, 0 }};
int rtbuf_signal_hipass_start (s_rtbuf *rtb)
{
s_rtbuf_signal_hipass_data *data;
assert(rtb->proc->out_bytes == sizeof(*data));
data = (s_rtbuf_signal_hipass_data*) rtb->data;
data->x1 = 0;
data->y1 = 0;
return 0;
}
int rtbuf_signal_hipass (s_rtbuf *rtb)
{
s_rtbuf_signal_fun in;
s_rtbuf_signal_fun cutoff;
s_rtbuf_signal_hipass_data *data;
unsigned int i = 0;
double k = 2.0 * RTBUF_SIGNAL_SAMPLERATE;
rtbuf_signal_fun(rtb, RTBUF_SIGNAL_HIPASS_IN_SIGNAL, &in);
rtbuf_signal_fun(rtb, RTBUF_SIGNAL_HIPASS_IN_CUTOFF, &cutoff);
data = (s_rtbuf_signal_hipass_data*) rtb->data;
while (i < RTBUF_SIGNAL_SAMPLES) {
double x = in.sample_fun(in.signal, i);
double fc = cutoff.sample_fun(cutoff.signal, i);
double wc = 2.0 * M_PI * fc;
data->signal[i] = (k * (x - data->x1) + (k - wc) * data->y1) / (k + wc);
data->x1 = x;
data->y1 = data->signal[i];
i++;
}
return 0;
}
s_rtbuf_lib_proc rtbuf_lib_proc =
{ "hipass",
rtbuf_signal_hipass,
rtbuf_signal_hipass_start,
0,
rtbuf_signal_hipass_in,
rtbuf_signal_hipass_out };
unsigned long rtbuf_lib_ver = RTBUF_LIB_VER;