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
|
/*
* Copyright (C) 2002 Anders Johansson ajh@atri.curtin.edu.au
*
* This file is part of MPlayer.
*
* MPlayer is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* MPlayer is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#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_comp_s
{
int enable[AF_NCH]; // Enable/disable / channel
float time[AF_NCH]; // Forgetting factor for power estimate
float pow[AF_NCH]; // Estimated power level [dB]
float tresh[AF_NCH]; // Threshold [dB]
int attack[AF_NCH]; // Attack time [ms]
int release[AF_NCH]; // Release time [ms]
float ratio[AF_NCH]; // Compression ratio
}af_comp_t;
// Initialization and runtime control
static int control(struct af_instance_s* af, int cmd, void* arg)
{
af_comp_t* s = (af_comp_t*)af->setup;
int i;
switch(cmd){
case AF_CONTROL_REINIT:
// Sanity check
if(!arg) return AF_ERROR;
af->data->rate = ((af_data_t*)arg)->rate;
af->data->nch = ((af_data_t*)arg)->nch;
af->data->format = AF_FORMAT_FLOAT_NE;
af->data->bps = 4;
// Time constant set to 0.1s
// s->alpha = (1.0/0.2)/(2.0*M_PI*(float)((af_data_t*)arg)->rate);
return af_test_output(af,(af_data_t*)arg);
case AF_CONTROL_COMMAND_LINE:{
/* float v=-10.0; */
/* float vol[AF_NCH]; */
/* float s=0.0; */
/* float clipp[AF_NCH]; */
/* int i; */
/* sscanf((char*)arg,"%f:%f", &v, &s); */
/* for(i=0;i<AF_NCH;i++){ */
/* vol[i]=v; */
/* clipp[i]=s; */
/* } */
/* if(AF_OK != control(af,AF_CONTROL_VOLUME_SOFTCLIP | AF_CONTROL_SET, clipp)) */
/* return AF_ERROR; */
/* return control(af,AF_CONTROL_VOLUME_LEVEL | AF_CONTROL_SET, vol); */
}
case AF_CONTROL_COMP_ON_OFF | AF_CONTROL_SET:
memcpy(s->enable,(int*)arg,AF_NCH*sizeof(int));
return AF_OK;
case AF_CONTROL_COMP_ON_OFF | AF_CONTROL_GET:
memcpy((int*)arg,s->enable,AF_NCH*sizeof(int));
return AF_OK;
case AF_CONTROL_COMP_THRESH | AF_CONTROL_SET:
return af_from_dB(AF_NCH,(float*)arg,s->tresh,20.0,-60.0,-1.0);
case AF_CONTROL_COMP_THRESH | AF_CONTROL_GET:
return af_to_dB(AF_NCH,s->tresh,(float*)arg,10.0);
case AF_CONTROL_COMP_ATTACK | AF_CONTROL_SET:
return af_from_ms(AF_NCH,(float*)arg,s->attack,af->data->rate,500.0,0.1);
case AF_CONTROL_COMP_ATTACK | AF_CONTROL_GET:
return af_to_ms(AF_NCH,s->attack,(float*)arg,af->data->rate);
case AF_CONTROL_COMP_RELEASE | AF_CONTROL_SET:
return af_from_ms(AF_NCH,(float*)arg,s->release,af->data->rate,3000.0,10.0);
case AF_CONTROL_COMP_RELEASE | AF_CONTROL_GET:
return af_to_ms(AF_NCH,s->release,(float*)arg,af->data->rate);
case AF_CONTROL_COMP_RATIO | AF_CONTROL_SET:
for(i=0;i<AF_NCH;i++)
s->ratio[i] = clamp(((float*)arg)[i],1.0,10.0);
return AF_OK;
case AF_CONTROL_COMP_RATIO | AF_CONTROL_GET:
for(i=0;i<AF_NCH;i++)
((float*)arg)[i] = s->ratio[i];
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(struct af_instance_s* af, af_data_t* data)
{
af_data_t* c = data; // Current working data
af_comp_t* s = (af_comp_t*)af->setup; // Setup for this instance
float* a = (float*)c->audio; // Audio data
int len = c->len/4; // Number of samples
int ch = 0; // Channel counter
register int nch = c->nch; // Number of channels
register int i = 0;
// Compress/expand
for(ch = 0; ch < nch ; ch++){
if(s->enable[ch]){
float t = 1.0 - s->time[ch];
for(i=ch;i<len;i+=nch){
register float x = a[i];
register float pow = x*x;
s->pow[ch] = t*s->pow[ch] +
pow*s->time[ch]; // LP filter
if(pow < s->pow[ch]){
;
}
else{
;
}
a[i] = x;
}
}
}
return c;
}
// Allocate memory and set function pointers
static int af_open(af_instance_t* af){
af->control=control;
af->uninit=uninit;
af->play=play;
af->mul=1;
af->data=calloc(1,sizeof(af_data_t));
af->setup=calloc(1,sizeof(af_comp_t));
if(af->data == NULL || af->setup == NULL)
return AF_ERROR;
return AF_OK;
}
// Description of this filter
af_info_t af_info_comp = {
"Compressor/expander audio filter",
"comp",
"Anders",
"",
AF_FLAGS_NOT_REENTRANT,
af_open
};
|
