1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
|
/*=============================================================================
//
// 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.n=1;
af->mul.d=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
};
|
