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/*=============================================================================
//
// This software has been released under the terms of the GNU General Public
// license. See http://www.gnu.org/copyleft/gpl.html for details.
//
// Copyright 2006 Michael Niedermayer
// Copyright 2004 Alex Beregszaszi & Pierre Lombard (original af_extrastereo.c upon which this is based)
//
//=============================================================================
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <math.h>
#include <limits.h>
#include "af.h"
// Data for specific instances of this filter
typedef struct af_sinesuppress_s
{
double freq;
double decay;
double real;
double imag;
double ref;
double pos;
}af_sinesuppress_t;
static af_data_t* play_s16(struct af_instance_s* af, af_data_t* data);
//static af_data_t* play_float(struct af_instance_s* af, af_data_t* data);
// Initialization and runtime control
static int control(struct af_instance_s* af, int cmd, void* arg)
{
af_sinesuppress_t* s = (af_sinesuppress_t*)af->setup;
switch(cmd){
case AF_CONTROL_REINIT:{
// Sanity check
if(!arg) return AF_ERROR;
af->data->rate = ((af_data_t*)arg)->rate;
af->data->nch = 1;
#if 0
if (((af_data_t*)arg)->format == AF_FORMAT_FLOAT_NE)
{
af->data->format = AF_FORMAT_FLOAT_NE;
af->data->bps = 4;
af->play = play_float;
}// else
#endif
{
af->data->format = AF_FORMAT_S16_NE;
af->data->bps = 2;
af->play = play_s16;
}
return af_test_output(af,(af_data_t*)arg);
}
case AF_CONTROL_COMMAND_LINE:{
float f1,f2;
sscanf((char*)arg,"%f:%f", &f1,&f2);
s->freq = f1;
s->decay = f2;
return AF_OK;
}
case AF_CONTROL_SS_FREQ | AF_CONTROL_SET:
s->freq = *(float*)arg;
return AF_OK;
case AF_CONTROL_SS_FREQ | AF_CONTROL_GET:
*(float*)arg = s->freq;
return AF_OK;
case AF_CONTROL_SS_DECAY | AF_CONTROL_SET:
s->decay = *(float*)arg;
return AF_OK;
case AF_CONTROL_SS_DECAY | AF_CONTROL_GET:
*(float*)arg = s->decay;
return AF_OK;
}
return AF_UNKNOWN;
}
// Deallocate memory
static void uninit(struct af_instance_s* af)
{
if(af->data)
free(af->data);
if(af->setup)
free(af->setup);
}
// Filter data through filter
static af_data_t* play_s16(struct af_instance_s* af, af_data_t* data)
{
af_sinesuppress_t *s = af->setup;
register int i = 0;
int16_t *a = (int16_t*)data->audio; // Audio data
int len = data->len/2; // Number of samples
for (i = 0; i < len; i++)
{
double co= cos(s->pos);
double si= sin(s->pos);
s->real += co * a[i];
s->imag += si * a[i];
s->ref += co * co;
a[i] -= (s->real * co + s->imag * si) / s->ref;
s->real -= s->real * s->decay;
s->imag -= s->imag * s->decay;
s->ref -= s->ref * s->decay;
s->pos += 2 * M_PI * s->freq / data->rate;
}
af_msg(AF_MSG_VERBOSE,"[sinesuppress] f:%8.2f: amp:%8.2f\n", s->freq, sqrt(s->real*s->real + s->imag*s->imag) / s->ref);
return data;
}
#if 0
static af_data_t* play_float(struct af_instance_s* af, af_data_t* data)
{
af_sinesuppress_t *s = af->setup;
register int i = 0;
float *a = (float*)data->audio; // Audio data
int len = data->len/4; // Number of samples
float avg, l, r;
for (i = 0; i < len; i+=2)
{
avg = (a[i] + a[i + 1]) / 2;
/* l = avg + (s->mul * (a[i] - avg));
r = avg + (s->mul * (a[i + 1] - avg));*/
a[i] = af_softclip(l);
a[i + 1] = af_softclip(r);
}
return data;
}
#endif
// Allocate memory and set function pointers
static int af_open(af_instance_t* af){
af->control=control;
af->uninit=uninit;
af->play=play_s16;
af->mul=1;
af->data=calloc(1,sizeof(af_data_t));
af->setup=calloc(1,sizeof(af_sinesuppress_t));
if(af->data == NULL || af->setup == NULL)
return AF_ERROR;
((af_sinesuppress_t*)af->setup)->freq = 50.0;
((af_sinesuppress_t*)af->setup)->decay = 0.0001;
return AF_OK;
}
// Description of this filter
af_info_t af_info_sinesuppress = {
"Sine Suppress",
"sinesuppress",
"Michael Niedermayer",
"",
0,
af_open
};
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