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 /ulaw.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 'ulaw.c')
-rw-r--r-- | ulaw.c | 106 |
1 files changed, 0 insertions, 106 deletions
diff --git a/ulaw.c b/ulaw.c deleted file mode 100644 index 2735f6cce..000000000 --- a/ulaw.c +++ /dev/null @@ -1,106 +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/ulaw.h" - -#define ZEROTRAP /*!< turn on the trap as per the MIL-STD */ -#define BIAS 0x84 /*!< define the add-in bias for 16 bit samples */ -#define CLIP 32635 - -unsigned char __ast_lin2mu[16384]; -short __ast_mulaw[256]; - - -static unsigned char linear2ulaw(short sample) -{ - static int exp_lut[256] = { - 0,0,1,1,2,2,2,2,3,3,3,3,3,3,3,3, - 4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4, - 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5, - 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5, - 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6, - 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6, - 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6, - 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6, - 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, - 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, - 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, - 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, - 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, - 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, - 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, - 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7 }; - int sign, exponent, mantissa; - unsigned char ulawbyte; - - /* Get the sample into sign-magnitude. */ - sign = (sample >> 8) & 0x80; /* set aside the sign */ - if (sign != 0) - sample = -sample; /* get magnitude */ - if (sample > CLIP) - sample = CLIP; /* clip the magnitude */ - - /* Convert from 16 bit linear to ulaw. */ - sample = sample + BIAS; - exponent = exp_lut[(sample >> 7) & 0xFF]; - mantissa = (sample >> (exponent + 3)) & 0x0F; - ulawbyte = ~(sign | (exponent << 4) | mantissa); -#ifdef ZEROTRAP - if (ulawbyte == 0) - ulawbyte = 0x02; /* optional CCITT trap */ -#endif - - return ulawbyte; -} - -/*! - * \brief Set up mu-law conversion table - */ -void ast_ulaw_init(void) -{ - int i; - for (i = 0; i < 256; i++) { - short mu, e, f, y; - static short etab[] = {0,132,396,924,1980,4092,8316,16764}; - - mu = 255 - i; - e = (mu & 0x70) / 16; - f = mu & 0x0f; - y = f * (1 << (e + 3)); - y += etab[e]; - if (mu & 0x80) - y = -y; - __ast_mulaw[i] = y; - } - /* set up the reverse (mu-law) conversion table */ - for (i = -32768; i < 32768; i++) { - __ast_lin2mu[((unsigned short)i) >> 2] = linear2ulaw(i); - } -} - |