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44 lines
1.1 KiB
C
44 lines
1.1 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 1999 - 2005, Digium, Inc.
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*
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* Mark Spencer <markster@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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* \brief u-Law to Signed linear conversion
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*/
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#ifndef _ASTERISK_ULAW_H
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#define _ASTERISK_ULAW_H
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/*! Init the ulaw conversion stuff */
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/*!
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* To init the ulaw to slinear conversion stuff, this needs to be run.
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*/
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void ast_ulaw_init(void);
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/*! converts signed linear to mulaw */
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/*!
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*/
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extern unsigned char __ast_lin2mu[16384];
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/*! help */
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extern short __ast_mulaw[256];
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#define AST_LIN2MU(a) (__ast_lin2mu[((unsigned short)(a)) >> 2])
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#define AST_MULAW(a) (__ast_mulaw[(a)])
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#endif /* _ASTERISK_ULAW_H */
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