aboutsummaryrefslogtreecommitdiffstats
path: root/include/asterisk/ulaw.h
blob: 5bb8065fe9e8ca7628695a660e426c45cb08fcf1 (plain)
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
/*
 * Asterisk -- A telephony toolkit for Linux.
 *
 * u-Law to Signed linear conversion
 * 
 * Copyright (C) 1999, Mark Spencer
 *
 * Mark Spencer <markster@linux-support.net>
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License
 */

#ifndef _ASTERISK_ULAW_H
#define _ASTERISK_ULAW_H

//! Init the ulaw conversion stuff
/*!
 * To init the ulaw to slinear conversion stuff, this needs to be run.
 */
extern void ast_ulaw_init(void);

//! converts signed linear to mulaw
/*!
  */
extern unsigned char __ast_lin2mu[16384];

//! help
extern short __ast_mulaw[256];

#define AST_LIN2MU(a) (__ast_lin2mu[((unsigned short)(a)) >> 2])
#define AST_MULAW(a) (__ast_mulaw[(a)])

#endif