diff options
author | kpfleming <kpfleming@f38db490-d61c-443f-a65b-d21fe96a405b> | 2006-08-21 02:11:39 +0000 |
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committer | kpfleming <kpfleming@f38db490-d61c-443f-a65b-d21fe96a405b> | 2006-08-21 02:11:39 +0000 |
commit | 8b0c007ad990aa27d9868da49215fd1076ac77cc (patch) | |
tree | 270b9c46c1e644483d6d2a35b509f43218ba3252 /alaw.c | |
parent | a42edc84034f91932a3e12d503e07f76a6eb498a (diff) |
merge new_loader_completion branch, including (at least):
- restructured build tree and makefiles to eliminate recursion problems
- support for embedded modules
- support for static builds
- simpler cross-compilation support
- simpler module/loader interface (no exported symbols)
git-svn-id: http://svn.digium.com/svn/asterisk/trunk@40722 f38db490-d61c-443f-a65b-d21fe96a405b
Diffstat (limited to 'alaw.c')
-rw-r--r-- | alaw.c | 101 |
1 files changed, 0 insertions, 101 deletions
diff --git a/alaw.c b/alaw.c deleted file mode 100644 index 782419d9e..000000000 --- a/alaw.c +++ /dev/null @@ -1,101 +0,0 @@ -/* - * 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 u-Law to Signed linear conversion - * - * \author Mark Spencer <markster@digium.com> - */ - -#include "asterisk.h" - -ASTERISK_FILE_VERSION(__FILE__, "$Revision$") - -#include "asterisk/alaw.h" - -#define AMI_MASK 0x55 - -static inline unsigned char linear2alaw (short int linear) -{ - int mask; - int seg; - int pcm_val; - static int seg_end[8] = - { - 0xFF, 0x1FF, 0x3FF, 0x7FF, 0xFFF, 0x1FFF, 0x3FFF, 0x7FFF - }; - - pcm_val = linear; - if (pcm_val >= 0) - { - /* Sign (7th) bit = 1 */ - mask = AMI_MASK | 0x80; - } - else - { - /* Sign bit = 0 */ - mask = AMI_MASK; - pcm_val = -pcm_val; - } - - /* Convert the scaled magnitude to segment number. */ - for (seg = 0; seg < 8; seg++) - { - if (pcm_val <= seg_end[seg]) - break; - } - /* Combine the sign, segment, and quantization bits. */ - return ((seg << 4) | ((pcm_val >> ((seg) ? (seg + 3) : 4)) & 0x0F)) ^ mask; -} -/*- End of function --------------------------------------------------------*/ - -static inline short int alaw2linear (unsigned char alaw) -{ - int i; - int seg; - - alaw ^= AMI_MASK; - i = ((alaw & 0x0F) << 4); - seg = (((int) alaw & 0x70) >> 4); - if (seg) - i = (i + 0x100) << (seg - 1); - return (short int) ((alaw & 0x80) ? i : -i); -} - -unsigned char __ast_lin2a[8192]; -short __ast_alaw[256]; - -void ast_alaw_init(void) -{ - int i; - /* - * Set up mu-law conversion table - */ - for(i = 0;i < 256;i++) - { - __ast_alaw[i] = alaw2linear(i); - } - /* set up the reverse (mu-law) conversion table */ - for(i = -32768; i < 32768; i++) - { - __ast_lin2a[((unsigned short)i) >> 3] = linear2alaw(i); - } - -} - |