diff options
Diffstat (limited to '1.4.23-rc4/include/asterisk/alaw.h')
-rw-r--r-- | 1.4.23-rc4/include/asterisk/alaw.h | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/1.4.23-rc4/include/asterisk/alaw.h b/1.4.23-rc4/include/asterisk/alaw.h new file mode 100644 index 000000000..44b3bad86 --- /dev/null +++ b/1.4.23-rc4/include/asterisk/alaw.h @@ -0,0 +1,43 @@ +/* + * Asterisk -- An open source telephony toolkit. + * + * Copyright (C) 1999 - 2005, Digium, Inc. + * + * Mark Spencer <markster@digium.com> + * + * See http://www.asterisk.org for more information about + * the Asterisk project. Please do not directly contact + * any of the maintainers of this project for assistance; + * the project provides a web site, mailing lists and IRC + * channels for your use. + * + * This program is free software, distributed under the terms of + * the GNU General Public License Version 2. See the LICENSE file + * at the top of the source tree. + */ + +/*! \file + * \brief A-Law to Signed linear conversion + */ + +#ifndef _ASTERISK_ALAW_H +#define _ASTERISK_ALAW_H + +/*! Init the ulaw conversion stuff */ +/*! + * To init the ulaw to slinear conversion stuff, this needs to be run. + */ +void ast_alaw_init(void); + +/*! converts signed linear to mulaw */ +/*! + */ +extern unsigned char __ast_lin2a[8192]; + +/*! help */ +extern short __ast_alaw[256]; + +#define AST_LIN2A(a) (__ast_lin2a[((unsigned short)(a)) >> 3]) +#define AST_ALAW(a) (__ast_alaw[(int)(a)]) + +#endif /* _ASTERISK_ALAW_H */ |