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ulaw.h
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1995-02-05
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/*
** This table converts from ulaw to 16 bit linear,
** and from ulaw to 8 bit linear.
**
** Created by 'st_ulaw_to_linear_slow()' written by:
**
** Craig Reese: IDA/Supercomputing Research Center
** 29 September 1989
**
** References:
** 1) CCITT Recommendation G.711 (very difficult to follow)
** 2) MIL-STD-188-113,"Interoperability and Performance Standards
** for Analog-to_Digital Conversion Techniques,"
** 17 February 1987
**
** Input: 8 bit ulaw sample
** Output: signed 16 bit linear sample or signed 8 bit sample
*/
#define ulaw_to_short_linear(x) ulawstable[x]
#define ulaw_to_byte_linear(x) ulawbtable[x]
short ulawstable[256] = {
-32124, -31100, -30076, -29052, -28028, -27004, -25980, -24956,
-23932, -22908, -21884, -20860, -19836, -18812, -17788, -16764,
-15996, -15484, -14972, -14460, -13948, -13436, -12924, -12412,
-11900, -11388, -10876, -10364, -9852, -9340, -8828, -8316,
-7932, -7676, -7420, -7164, -6908, -6652, -6396, -6140,
-5884, -5628, -5372, -5116, -4860, -4604, -4348, -4092,
-3900, -3772, -3644, -3516, -3388, -3260, -3132, -3004,
-2876, -2748, -2620, -2492, -2364, -2236, -2108, -1980,
-1884, -1820, -1756, -1692, -1628, -1564, -1500, -1436,
-1372, -1308, -1244, -1180, -1116, -1052, -988, -924,
-876, -844, -812, -780, -748, -716, -684, -652,
-620, -588, -556, -524, -492, -460, -428, -396,
-372, -356, -340, -324, -308, -292, -276, -260,
-244, -228, -212, -196, -180, -164, -148, -132,
-120, -112, -104, -96, -88, -80, -72, -64,
-56, -48, -40, -32, -24, -16, -8, 0,
32124, 31100, 30076, 29052, 28028, 27004, 25980, 24956,
23932, 22908, 21884, 20860, 19836, 18812, 17788, 16764,
15996, 15484, 14972, 14460, 13948, 13436, 12924, 12412,
11900, 11388, 10876, 10364, 9852, 9340, 8828, 8316,
7932, 7676, 7420, 7164, 6908, 6652, 6396, 6140,
5884, 5628, 5372, 5116, 4860, 4604, 4348, 4092,
3900, 3772, 3644, 3516, 3388, 3260, 3132, 3004,
2876, 2748, 2620, 2492, 2364, 2236, 2108, 1980,
1884, 1820, 1756, 1692, 1628, 1564, 1500, 1436,
1372, 1308, 1244, 1180, 1116, 1052, 988, 924,
876, 844, 812, 780, 748, 716, 684, 652,
620, 588, 556, 524, 492, 460, 428, 396,
372, 356, 340, 324, 308, 292, 276, 260,
244, 228, 212, 196, 180, 164, 148, 132,
120, 112, 104, 96, 88, 80, 72, 64,
56, 48, 40, 32, 24, 16, 8, 0
};
char ulawbtable[256] = {
-126, -122, -118, -114, -110, -106, -102, -98,
-94, -90, -86, -82, -78, -74, -70, -66,
-63, -61, -59, -57, -55, -53, -51, -49,
-47, -45, -43, -41, -39, -37, -35, -33,
-31, -30, -29, -28, -27, -26, -25, -24,
-23, -22, -21, -20, -19, -18, -17, -16,
-16, -15, -15, -14, -14, -13, -13, -12,
-12, -11, -11, -10, -10, -9, -9, -8,
-8, -8, -7, -7, -7, -7, -6, -6,
-6, -6, -5, -5, -5, -5, -4, -4,
-4, -4, -4, -4, -3, -3, -3, -3,
-3, -3, -3, -3, -2, -2, -2, -2,
-2, -2, -2, -2, -2, -2, -2, -2,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, 0,
125, 121, 117, 113, 109, 105, 101, 97,
93, 89, 85, 81, 77, 73, 69, 65,
62, 60, 58, 56, 54, 52, 50, 48,
46, 44, 42, 40, 38, 36, 34, 32,
30, 29, 28, 27, 26, 25, 24, 23,
22, 21, 20, 19, 18, 17, 16, 15,
15, 14, 14, 13, 13, 12, 12, 11,
11, 10, 10, 9, 9, 8, 8, 7,
7, 7, 6, 6, 6, 6, 5, 5,
5, 5, 4, 4, 4, 4, 3, 3,
3, 3, 3, 3, 2, 2, 2, 2,
2, 2, 2, 2, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0
};