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
|
/*
* mad - MPEG audio decoder
* Copyright (C) 2000-2001 Robert Leslie
*
* This program 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.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* $Id: audio_cdda.c,v 1.4 2001/11/09 00:40:38 rob Exp $
*/
# ifdef HAVE_CONFIG_H
# include "config.h"
# endif
# include "global.h"
# include <stdio.h>
# include <string.h>
# ifdef HAVE_ASSERT_H
# include <assert.h>
# endif
# include "mad.h"
# include "audio.h"
static FILE *outfile;
unsigned int samplecount;
# define CD_FRAMESZ (44100 / 75)
static
int init(struct audio_init *init)
{
if (init->path && strcmp(init->path, "-") != 0) {
outfile = fopen(init->path, "wb");
if (outfile == 0) {
audio_error = ":";
return -1;
}
}
else
outfile = stdout;
samplecount = 0;
return 0;
}
static
int config(struct audio_config *config)
{
/* force 16-bit 44100 Hz stereo */
config->channels = 2;
config->speed = 44100;
config->precision = 16;
return 0;
}
static
int output(unsigned char const *data, unsigned int nsamples)
{
unsigned int count;
int result = 0;
count = fwrite(data, 2 * 2, nsamples, outfile);
if (count != nsamples) {
audio_error = ":fwrite";
result = -1;
}
samplecount = (samplecount + count) % CD_FRAMESZ;
return result;
}
static
int play(struct audio_play *play)
{
unsigned char data[MAX_NSAMPLES * 2 * 2];
assert(play->samples[1]);
audio_pcm_s16be(data, play->nsamples, play->samples[0], play->samples[1],
play->mode, play->stats);
return output(data, play->nsamples);
}
static
int stop(struct audio_stop *stop)
{
return 0;
}
static
int finish(struct audio_finish *finish)
{
int result = 0;
/* pad audio to CD frame boundary */
if (samplecount) {
unsigned char padding[CD_FRAMESZ * 2 * 2];
unsigned int padsz;
assert(samplecount < CD_FRAMESZ);
padsz = CD_FRAMESZ - samplecount;
memset(padding, 0, padsz * 2 * 2);
result = output(padding, padsz);
}
if (outfile != stdout &&
fclose(outfile) == EOF &&
result == 0) {
audio_error = ":fclose";
result = -1;
}
return result;
}
int audio_cdda(union audio_control *control)
{
audio_error = 0;
switch (control->command) {
case AUDIO_COMMAND_INIT:
return init(&control->init);
case AUDIO_COMMAND_CONFIG:
return config(&control->config);
case AUDIO_COMMAND_PLAY:
return play(&control->play);
case AUDIO_COMMAND_STOP:
return stop(&control->stop);
case AUDIO_COMMAND_FINISH:
return finish(&control->finish);
}
return 0;
}
|
