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/* $OpenBSD: mulaw.c,v 1.2 1997/11/07 08:06:36 niklas Exp $ */
/*
* Copyright (c) 1991-1993 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the Computer Systems
* Engineering Group at Lawrence Berkeley Laboratory.
* 4. Neither the name of the University nor of the Laboratory may be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include <sys/types.h>
#include <sys/audioio.h>
#include <dev/mulaw.h>
static u_char mulawtolin[256] = {
128, 4, 8, 12, 16, 20, 24, 28,
32, 36, 40, 44, 48, 52, 56, 60,
64, 66, 68, 70, 72, 74, 76, 78,
80, 82, 84, 86, 88, 90, 92, 94,
96, 97, 98, 99, 100, 101, 102, 103,
104, 105, 106, 107, 108, 109, 110, 111,
112, 112, 113, 113, 114, 114, 115, 115,
116, 116, 117, 117, 118, 118, 119, 119,
120, 120, 120, 121, 121, 121, 121, 122,
122, 122, 122, 123, 123, 123, 123, 124,
124, 124, 124, 124, 125, 125, 125, 125,
125, 125, 125, 125, 126, 126, 126, 126,
126, 126, 126, 126, 126, 126, 126, 126,
127, 127, 127, 127, 127, 127, 127, 127,
127, 127, 127, 127, 127, 127, 127, 127,
127, 127, 127, 127, 127, 127, 127, 127,
255, 251, 247, 243, 239, 235, 231, 227,
223, 219, 215, 211, 207, 203, 199, 195,
191, 189, 187, 185, 183, 181, 179, 177,
175, 173, 171, 169, 167, 165, 163, 161,
159, 158, 157, 156, 155, 154, 153, 152,
151, 150, 149, 148, 147, 146, 145, 144,
143, 143, 142, 142, 141, 141, 140, 140,
139, 139, 138, 138, 137, 137, 136, 136,
135, 135, 135, 134, 134, 134, 134, 133,
133, 133, 133, 132, 132, 132, 132, 131,
131, 131, 131, 131, 130, 130, 130, 130,
130, 130, 130, 130, 129, 129, 129, 129,
129, 129, 129, 129, 129, 129, 129, 129,
128, 128, 128, 128, 128, 128, 128, 128,
128, 128, 128, 128, 128, 128, 128, 128,
128, 128, 128, 128, 128, 128, 128, 128,
};
static u_char lintomulaw[256] = {
0, 0, 0, 0, 0, 1, 1, 1,
1, 2, 2, 2, 2, 3, 3, 3,
3, 4, 4, 4, 4, 5, 5, 5,
5, 6, 6, 6, 6, 7, 7, 7,
7, 8, 8, 8, 8, 9, 9, 9,
9, 10, 10, 10, 10, 11, 11, 11,
11, 12, 12, 12, 12, 13, 13, 13,
13, 14, 14, 14, 14, 15, 15, 15,
15, 16, 16, 17, 17, 18, 18, 19,
19, 20, 20, 21, 21, 22, 22, 23,
23, 24, 24, 25, 25, 26, 26, 27,
27, 28, 28, 29, 29, 30, 30, 31,
31, 32, 33, 34, 35, 36, 37, 38,
39, 40, 41, 42, 43, 44, 45, 46,
47, 48, 50, 52, 54, 56, 58, 60,
62, 65, 69, 73, 77, 83, 91, 103,
255, 231, 219, 211, 205, 201, 197, 193,
190, 188, 186, 184, 182, 180, 178, 176,
175, 174, 173, 172, 171, 170, 169, 168,
167, 166, 165, 164, 163, 162, 161, 160,
159, 159, 158, 158, 157, 157, 156, 156,
155, 155, 154, 154, 153, 153, 152, 152,
151, 151, 150, 150, 149, 149, 148, 148,
147, 147, 146, 146, 145, 145, 144, 144,
143, 143, 143, 143, 142, 142, 142, 142,
141, 141, 141, 141, 140, 140, 140, 140,
139, 139, 139, 139, 138, 138, 138, 138,
137, 137, 137, 137, 136, 136, 136, 136,
135, 135, 135, 135, 134, 134, 134, 134,
133, 133, 133, 133, 132, 132, 132, 132,
131, 131, 131, 131, 130, 130, 130, 130,
129, 129, 129, 129, 128, 128, 128, 128,
};
void
mulaw_compress(hdl, e, p, cc)
void *hdl;
int e;
u_char *p;
int cc;
{
u_char *tab;
switch (e) {
case AUDIO_ENCODING_ULAW:
tab = lintomulaw;
break;
default:
return;
}
while (--cc >= 0) {
*p = tab[*p];
++p;
}
}
void
mulaw_expand(hdl, e, p, cc)
void *hdl;
int e;
u_char *p;
int cc;
{
u_char *tab;
switch (e) {
case AUDIO_ENCODING_ULAW:
tab = mulawtolin;
break;
default:
return;
}
while (--cc >= 0) {
*p = tab[*p];
++p;
}
}
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