File: audio_wave.c

package info (click to toggle)
madplay 0.15.2b-9
  • links: PTS
  • area: main
  • in suites: bullseye, sid
  • size: 3,208 kB
  • sloc: ansic: 17,882; sh: 9,397; makefile: 503; yacc: 288; sed: 16
file content (307 lines) | stat: -rw-r--r-- 6,350 bytes parent folder | download | duplicates (8)
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
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
/*
 * madplay - MPEG audio decoder and player
 * Copyright (C) 2000-2004 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_wave.c,v 1.18 2004/01/23 09:41:31 rob Exp $
 */

# ifdef HAVE_CONFIG_H
#  include "config.h"
# endif

# include "global.h"

# include <stdio.h>
# include <string.h>
# include <mad.h>

# include "audio.h"

static FILE *outfile;
static audio_pcmfunc_t *audio_pcm;

static unsigned long riff_len, data_len;
static long data_chunk;

static unsigned int config_channels;
static unsigned int config_speed;
static unsigned int config_precision;

# define WAVE_FORMAT_PCM	0x0001
# define UNKNOWN_LENGTH		"\xff\xff\xff\xff"

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;

  /* RIFF header and (WAVE) data type identifier */

  if (fwrite("RIFF" UNKNOWN_LENGTH "WAVE", 4 + 4 + 4, 1, outfile) != 1) {
    audio_error = ":fwrite";
    return -1;
  }

  riff_len   =  4;
  data_chunk = -1;

  config_channels  = 0;
  config_speed     = 0;
  config_precision = 0;

  return 0;
}

/*
 * NAME:	int32()
 * DESCRIPTION:	store 32-bit little-endian integer
 */
static
void int32(unsigned char *ptr, unsigned long num)
{
  ptr[0] = num >>  0;
  ptr[1] = num >>  8;
  ptr[2] = num >> 16;
  ptr[3] = num >> 24;
}

/*
 * NAME:	int16()
 * DESCRIPTION:	store 16-bit little-endian integer
 */
static
void int16(unsigned char *ptr, unsigned int num)
{
  ptr[0] = num >> 0;
  ptr[1] = num >> 8;
}

static
int config(struct audio_config *config)
{
  unsigned char chunk[8 + 16];
  unsigned int block_al, bitdepth;
  unsigned long bytes_ps;

  if (config_precision) {
    /* it's not possible to change the format once set */

    config->channels  = config_channels;
    config->speed     = config_speed;
    config->precision = config_precision;

    return 0;
  }

  bitdepth = config->precision;
  if (bitdepth == 0)
    bitdepth = 16;
  else if (bitdepth > 32)
    bitdepth = 32;

  /* Format chunk */

  block_al = config->channels * ((bitdepth + 7) / 8);
  bytes_ps = config->speed * block_al;

  memcpy(&chunk[0], "fmt ", 4);		/* chunkID */
  int32(&chunk[4],  16);		/* chunkSize */

  int16(&chunk[8],  WAVE_FORMAT_PCM);	/* wFormatTag */
  int16(&chunk[10], config->channels);	/* wChannels */
  int32(&chunk[12], config->speed);	/* dwSamplesPerSec */
  int32(&chunk[16], bytes_ps);		/* dwAvgBytesPerSec */
  int16(&chunk[20], block_al);		/* wBlockAlign */

  /* PCM-format-specific */

  int16(&chunk[22], bitdepth);		/* wBitsPerSample */

  if (fwrite(chunk, 8 + 16, 1, outfile) != 1) {
    audio_error = ":fwrite";
    return -1;
  }

  riff_len += 8 + 16;

  /* Data chunk */

  data_chunk = ftell(outfile);

  if (fwrite("data" UNKNOWN_LENGTH, 8 + 0, 1, outfile) != 1) {
    audio_error = ":fwrite";
    return -1;
  }

  riff_len += 8 + 0;
  data_len  = 0;

  switch (config->precision = bitdepth) {
  case 1: case 2: case 3: case 4:
  case 5: case 6: case 7: case 8:
    audio_pcm = audio_pcm_u8;
    break;

  case  9: case 10: case 11: case 12:
  case 13: case 14: case 15: case 16:
    audio_pcm = audio_pcm_s16le;
    break;

  case 17: case 18: case 19: case 20:
  case 21: case 22: case 23: case 24:
    audio_pcm = audio_pcm_s24le;
    break;

  case 25: case 26: case 27: case 28:
  case 29: case 30: case 31: case 32:
    audio_pcm = audio_pcm_s32le;
    break;
  }

  config_channels  = config->channels;
  config_speed     = config->speed;
  config_precision = config->precision;

  return 0;
}

static
int play(struct audio_play *play)
{
  unsigned char data[MAX_NSAMPLES * 4 * 2];
  unsigned int len;

  len = audio_pcm(data, play->nsamples, play->samples[0], play->samples[1],
		  play->mode, play->stats);

  if (fwrite(data, len, 1, outfile) != 1) {
    audio_error = ":fwrite";
    return -1;
  }

  data_len += len;
  riff_len += len;

  return 0;
}

static
int stop(struct audio_stop *stop)
{
  return 0;
}

static
int patch_int32(long address, unsigned long num)
{
  unsigned char dword[4];

  if (fseek(outfile, address, SEEK_SET) == -1) {
    audio_error = ":fseek";
    return -1;
  }

  int32(dword, num);

  if (fwrite(dword, sizeof(dword), 1, outfile) != 1) {
    audio_error = ":fwrite";
    return -1;
  }

  if (fseek(outfile, 0, SEEK_END) == -1) {
    audio_error = ":fseek";
    return -1;
  }

  return 0;
}

static
int finish(struct audio_finish *finish)
{
  int result = 0;

  if (config_precision == 0) {
    struct audio_config dummy;

    /* write empty chunks */

    dummy.command   = AUDIO_COMMAND_CONFIG;
    dummy.channels  = 2;
    dummy.speed     = 44100;
    dummy.precision = 0;

    result = config(&dummy);
  }

  if (data_len & 1) {
    if (fputc(0, outfile) == EOF && result == 0) {
      audio_error = ":fputc";
      result = -1;
    }

    ++riff_len;
  }

  if (result == 0 &&
      data_chunk != -1 && patch_int32(data_chunk + 4, data_len) == -1)
    result = -1;

  if (result == 0)
    patch_int32(4, riff_len);

  if (outfile != stdout &&
      fclose(outfile) == EOF &&
      result == 0) {
    audio_error = ":fclose";
    result = -1;
  }

  return result;
}

int audio_wave(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;
}