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
187
188
189
190
191
|
/*
* Copyright (C) 2002 Anders Johansson ajh@atri.curtin.edu.au
*
* This file is part of mpv.
*
* mpv 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.
*
* mpv 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 mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include <math.h>
#include <limits.h>
#include "common/common.h"
#include "af.h"
// Data for specific instances of this filter
typedef struct af_pan_s
{
int nch; // Number of output channels; zero means same as input
float level[AF_NCH][AF_NCH]; // Gain level for each channel
char *matrixstr;
}af_pan_t;
static void set_channels(struct mp_audio *mpa, int num)
{
struct mp_chmap map;
// "unknown" channel layouts make it easier to pass through audio data,
// without triggering remixing.
mp_chmap_set_unknown(&map, num);
mp_audio_set_channels(mpa, &map);
}
// Initialization and runtime control
static int control(struct af_instance* af, int cmd, void* arg)
{
af_pan_t* s = af->priv;
switch(cmd){
case AF_CONTROL_REINIT:
// Sanity check
if(!arg) return AF_ERROR;
af->data->rate = ((struct mp_audio*)arg)->rate;
mp_audio_set_format(af->data, AF_FORMAT_FLOAT);
set_channels(af->data, s->nch ? s->nch: ((struct mp_audio*)arg)->nch);
if((af->data->format != ((struct mp_audio*)arg)->format) ||
(af->data->bps != ((struct mp_audio*)arg)->bps)){
mp_audio_set_format((struct mp_audio*)arg, af->data->format);
return AF_FALSE;
}
return AF_OK;
case AF_CONTROL_SET_PAN_LEVEL:{
int i;
int ch = ((af_control_ext_t*)arg)->ch;
float* level = ((af_control_ext_t*)arg)->arg;
if (ch >= AF_NCH)
return AF_FALSE;
for(i=0;i<AF_NCH;i++)
s->level[ch][i] = level[i];
return AF_OK;
}
case AF_CONTROL_SET_PAN_NOUT:
// Reinit must be called after this function has been called
// Sanity check
if(((int*)arg)[0] <= 0 || ((int*)arg)[0] > AF_NCH){
MP_ERR(af, "The number of output channels must be"
" between 1 and %i. Current value is %i\n",AF_NCH,((int*)arg)[0]);
return AF_ERROR;
}
s->nch=((int*)arg)[0];
return AF_OK;
case AF_CONTROL_SET_PAN_BALANCE:{
float val = *(float*)arg;
if (s->nch)
return AF_ERROR;
if (af->data->nch >= 2) {
s->level[0][0] = MPMIN(1.f, 1.f - val);
s->level[0][1] = MPMAX(0.f, val);
s->level[1][0] = MPMAX(0.f, -val);
s->level[1][1] = MPMIN(1.f, 1.f + val);
}
return AF_OK;
}
case AF_CONTROL_GET_PAN_BALANCE:
if (s->nch)
return AF_ERROR;
*(float*)arg = s->level[0][1] - s->level[1][0];
return AF_OK;
}
return AF_UNKNOWN;
}
static int filter_frame(struct af_instance *af, struct mp_audio *c)
{
if (!c)
return 0;
struct mp_audio *l = mp_audio_pool_get(af->out_pool, &af->fmt_out, c->samples);
if (!l) {
talloc_free(c);
return -1;
}
mp_audio_copy_attributes(l, c);
af_pan_t* s = af->priv; // Setup for this instance
float* in = c->planes[0]; // Input audio data
float* out = NULL; // Output audio data
float* end = in+c->samples*c->nch; // End of loop
int nchi = c->nch; // Number of input channels
int ncho = l->nch; // Number of output channels
register int j,k;
out = l->planes[0];
// Execute panning
// FIXME: Too slow
while(in < end){
for(j=0;j<ncho;j++){
register float x = 0.0;
register float* tin = in;
for(k=0;k<nchi;k++)
x += tin[k] * s->level[j][k];
out[j] = x;
}
out+= ncho;
in+= nchi;
}
talloc_free(c);
af_add_output_frame(af, l);
return 0;
}
// Allocate memory and set function pointers
static int af_open(struct af_instance* af){
af->control=control;
af->filter_frame = filter_frame;
af_pan_t *s = af->priv;
int n = 0;
int j,k;
int nch = s->nch;
if(nch && AF_OK != control(af,AF_CONTROL_SET_PAN_NOUT, &nch))
return AF_ERROR;
// Read pan values
char *cp = s->matrixstr;
j = 0; k = 0;
while(cp && k < AF_NCH){
sscanf(cp, "%f%n" , &s->level[j][k], &n);
MP_VERBOSE(af, "Pan level from channel %i to"
" channel %i = %f\n",k,j,s->level[j][k]);
cp =&cp[n];
j++;
if(j>=nch){
j = 0;
k++;
}
if (*cp != ',')
break;
cp++;
}
return AF_OK;
}
#define OPT_BASE_STRUCT af_pan_t
const struct af_info af_info_pan = {
.info = "Panning audio filter",
.name = "pan",
.open = af_open,
.priv_size = sizeof(af_pan_t),
.options = (const struct m_option[]) {
OPT_INTRANGE("channels", nch, 0, 0, AF_NCH),
OPT_STRING("matrix", matrixstr, 0),
{0}
},
};
|
