aboutsummaryrefslogtreecommitdiffhomepage
path: root/libaf/af_sinesuppress.c
blob: e15a740c843c5127b948fdb4eda1e52bb40fc8b8 (plain)
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
177
178
179
180
181
182
183
184
185
186
/*
 * Copyright (C) 2006 Michael Niedermayer
 * Copyright (C) 2004 Alex Beregszaszi
 * based upon af_extrastereo.c by Pierre Lombard
 *
 * 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_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
};