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
|
/* $OpenBSD: aparams.c,v 1.3 2008/11/03 22:25:13 ratchov Exp $ */
/*
* Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "aparams.h"
/*
* Generate a string corresponding to the encoding in par,
* return the length of the resulting string
*/
int
aparams_enctostr(struct aparams *par, char *ostr)
{
char *p = ostr;
*p++ = par->sig ? 's' : 'u';
if (par->bits > 9)
*p++ = '0' + par->bits / 10;
*p++ = '0' + par->bits % 10;
if (par->bps > 1) {
*p++ = par->le ? 'l' : 'b';
*p++ = 'e';
if (par->bps != APARAMS_BPS(par->bits) ||
par->bits < par->bps * 8) {
*p++ = par->bps + '0';
if (par->bits < par->bps * 8) {
*p++ = par->msb ? 'm' : 'l';
*p++ = 's';
*p++ = 'b';
}
}
}
*p++ = '\0';
return p - ostr - 1;
}
/*
* Parse an encoding string, examples: s8, u8, s16, s16le, s24be ...
* set *istr to the char following the encoding. Retrun the number
* of bytes consumed
*/
int
aparams_strtoenc(struct aparams *par, char *istr)
{
char *p = istr;
int i, sig, bits, le, bps, msb;
#define IS_SEP(c) \
(((c) < 'a' || (c) > 'z') && \
((c) < 'A' || (c) > 'Z') && \
((c) < '0' || (c) > '9'))
/*
* get signedness
*/
if (*p == 's') {
sig = 1;
} else if (*p == 'u') {
sig = 0;
} else
return 0;
p++;
/*
* get number of bits per sample
*/
bits = 0;
for (i = 0; i < 2; i++) {
if (*p < '0' || *p > '9')
break;
bits = (bits * 10) + *p - '0';
p++;
}
if (bits < BITS_MIN || bits > BITS_MAX)
return 0;
bps = APARAMS_BPS(bits);
msb = 1;
le = NATIVE_LE;
/*
* get (optionnal) endianness
*/
if (p[0] == 'l' && p[1] == 'e') {
le = 1;
p += 2;
} else if (p[0] == 'b' && p[1] == 'e') {
le = 0;
p += 2;
} else if (IS_SEP(*p)) {
goto done;
} else
return 0;
/*
* get (optionnal) number of bytes
*/
if (*p >= '0' && *p <= '9') {
bps = *p - '0';
if (bps < (bits + 7) / 8 ||
bps > (BITS_MAX + 7) / 8)
return 0;
p++;
/*
* get (optionnal) alignement
*/
if (p[0] == 'm' && p[1] == 's' && p[2] == 'b') {
msb = 1;
p += 3;
} else if (p[0] == 'l' && p[1] == 's' && p[2] == 'b') {
msb = 0;
p += 3;
} else if (IS_SEP(*p)) {
goto done;
} else
return 0;
} else if (!IS_SEP(*p))
return 0;
done:
par->msb = msb;
par->sig = sig;
par->bits = bits;
par->bps = bps;
par->le = le;
return p - istr;
}
/*
* Initialise parameters structure with the defaults natively supported
* by the machine.
*/
void
aparams_init(struct aparams *par, unsigned cmin, unsigned cmax, unsigned rate)
{
par->bps = 2; /* 2 bytes per sample */
par->bits = 16; /* 16 significant bits per sample */
par->sig = 1; /* samples are signed */
par->le = NATIVE_LE;
par->msb = 1; /* msb justified */
par->cmin = cmin;
par->cmax = cmax;
par->rate = rate;
}
/*
* Print the format/channels/encoding on stderr.
*/
void
aparams_print(struct aparams *par)
{
char enc[ENCMAX];
aparams_enctostr(par, enc);
fprintf(stderr, "%s", enc);
fprintf(stderr, ",%u:%u", par->cmin, par->cmax);
fprintf(stderr, ",%uHz", par->rate);
}
void
aparams_print2(struct aparams *par1, struct aparams *par2)
{
aparams_print(par1);
fprintf(stderr, " -> ");
aparams_print(par2);
}
/*
* Return true if both encodings are the same.
*/
int
aparams_eqenc(struct aparams *par1, struct aparams *par2)
{
if (par1->bps != par2->bps ||
par1->bits != par2->bits ||
par1->sig != par2->sig)
return 0;
if ((par1->bits != 8 * par1->bps) && par1->msb != par2->msb)
return 0;
if (par1->bps > 1 && par1->le != par2->le)
return 0;
return 1;
}
/*
* Return true if both parameters are the same.
*/
int
aparams_eq(struct aparams *par1, struct aparams *par2)
{
if (!aparams_eqenc(par1, par2) ||
par1->cmin != par2->cmin ||
par1->cmax != par2->cmax ||
par1->rate != par2->rate)
return 0;
return 1;
}
/*
* Retrurn true if first channel range includes second range
*/
int
aparams_subset(struct aparams *subset, struct aparams *set)
{
return subset->cmin >= set->cmin && subset->cmax <= set->cmax;
}
/*
* Return true if rates are the same
*/
int
aparams_eqrate(struct aparams *p1, struct aparams *p2)
{
/* XXX: allow 1/9 halftone of difference */
return p1->rate == p2->rate;
}
/*
* Return the number of bytes per frame with the given parameters.
*/
unsigned
aparams_bpf(struct aparams *par)
{
return (par->cmax - par->cmin + 1) * par->bps;
}
void
aparams_copyenc(struct aparams *dst, struct aparams *src)
{
dst->sig = src->sig;
dst->le = src->le;
dst->msb = src->msb;
dst->bits = src->bits;
dst->bps = src->bps;
}
|
