u-law.c

HawkVoiceDI Project created and maintained by Phil Frisbie, Jr. <[e-mail]> HawkVoiceD

/*
  u-law sound encoder, part of the HawkVoice Direct Interface (HVDI)
  cross platform network voice library
  Copyright (C) 2001-2003 Phil Frisbie, Jr. ([e-mail])

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Library General Public
  License as published by the Free Software Foundation; either
  version 2 of the License, or (at your option) any later version.
  
  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Library General Public License for more details.
    
  You should have received a copy of the GNU Library General Public
  License along with this library; if not, write to the
  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  Boston, MA  02111-1307, USA.
      
  Or go to http://www.gnu.org/copyleft/lgpl.html
*/

#define audio_u2s(x)  ((short) (u2s[(int)((unsigned  char) (x))]))
#define audio_s2u(x)  (s2u[(((unsigned short) (x)) >> 3)])

const unsigned short u2s[] = {
        33280, 34308, 35336, 36364, 37393, 38421, 39449, 40477,
        41505, 42534, 43562, 44590, 45618, 46647, 47675, 48703,
        49474, 49988, 50503, 51017, 51531, 52045, 52559, 53073,
        53587, 54101, 54616, 55130, 55644, 56158, 56672, 57186,
        57572, 57829, 58086, 58343, 58600, 58857, 59114, 59371,
        59628, 59885, 60142, 60399, 60656, 60913, 61171, 61428,
        61620, 61749, 61877, 62006, 62134, 62263, 62392, 62520,
        62649, 62777, 62906, 63034, 63163, 63291, 63420, 63548,
        63645, 63709, 63773, 63838, 63902, 63966, 64030, 64095,
        64159, 64223, 64287, 64352, 64416, 64480, 64544, 64609,
        64657, 64689, 64721, 64753, 64785, 64818, 64850, 64882,
        64914, 64946, 64978, 65010, 65042, 65075, 65107, 65139,
        65163, 65179, 65195, 65211, 65227, 65243, 65259, 65275,
        65291, 65308, 65324, 65340, 65356, 65372, 65388, 65404,
        65416, 65424, 65432, 65440, 65448, 65456, 65464, 65472,
        65480, 65488, 65496, 65504, 65512, 65520, 65528,     0,
        32256, 31228, 30200, 29172, 28143, 27115, 26087, 25059,
        24031, 23002, 21974, 20946, 19918, 18889, 17861, 16833,
        16062, 15548, 15033, 14519, 14005, 13491, 12977, 12463,
        11949, 11435, 10920, 10406,  9892,  9378,  8864,  8350,
         7964,  7707,  7450,  7193,  6936,  6679,  6422,  6165, 
         5908,  5651,  5394,  5137,  4880,  4623,  4365,  4108, 
         3916,  3787,  3659,  3530,  3402,  3273,  3144,  3016, 
         2887,  2759,  2630,  2502,  2373,  2245,  2116,  1988, 
         1891,  1827,  1763,  1698,  1634,  1570,  1506,  1441, 
         1377,  1313,  1249,  1184,  1120,  1056,   992,   927, 
          879,   847,   815,   783,   751,   718,   686,   654,
          622,   590,   558,   526,   494,   461,   429,   397,
          373,   357,   341,   325,   309,   293,   277,   261,
          245,   228,   212,   196,   180,   164,   148,   132,
          120,   112,   104,    96,    88,    80,    72,    64,
           56,    48,    40,    32,    24,    16,    8,      0
};

const unsigned char s2u[] = {
0377,0376,0375,0374,0373,0372,0371,0370,0367,0366,0365,0364,0363,0362,0361,
0360,0357,0357,0356,0356,0355,0355,0354,0354,0353,0353,0352,0352,0351,0351,
0350,0350,0347,0347,0346,0346,0345,0345,0344,0344,0343,0343,0342,0342,0341,
0341,0340,0340,0337,0337,0337,0337,0336,0336,0336,0336,0335,0335,0335,0335,
0334,0334,0334,0334,0333,0333,0333,0333,0332,0332,0332,0332,0331,0331,0331,
0331,0330,0330,0330,0330,0327,0327,0327,0327,0326,0326,0326,0326,0325,0325,
0325,0325,0324,0324,0324,0324,0323,0323,0323,0323,0322,0322,0322,0322,0321,
0321,0321,0321,0320,0320,0320,0320,0317,0317,0317,0317,0317,0317,0317,0317,
0316,0316,0316,0316,0316,0316,0316,0316,0315,0315,0315,0315,0315,0315,0315,
0315,0314,0314,0314,0314,0314,0314,0314,0314,0313,0313,0313,0313,0313,0313,
0313,0313,0312,0312,0312,0312,0312,0312,0312,0312,0311,0311,0311,0311,0311,
0311,0311,0311,0310,0310,0310,0310,0310,0310,0310,0310,0307,0307,0307,0307,
0307,0307,0307,0307,0306,0306,0306,0306,0306,0306,0306,0306,0305,0305,0305,
0305,0305,0305,0305,0305,0304,0304,0304,0304,0304,0304,0304,0304,0303,0303,
0303,0303,0303,0303,0303,0303,0303,0302,0302,0302,0302,0302,0302,0302,0302,
0301,0301,0301,0301,0301,0301,0301,0301,0300,0300,0300,0300,0300,0300,0300,
0300,0277,0277,0277,0277,0277,0277,0277,0277,0277,0277,0277,0277,0277,0277,
0277,0277,0276,0276,0276,0276,0276,0276,0276,0276,0276,0276,0276,0276,0276,
0276,0276,0276,0275,0275,0275,0275,0275,0275,0275,0275,0275,0275,0275,0275,
0275,0275,0275,0275,0274,0274,0274,0274,0274,0274,0274,0274,0274,0274,0274,
0274,0274,0274,0274,0274,0273,0273,0273,0273,0273,0273,0273,0273,0273,0273,
0273,0273,0273,0273,0273,0273,0272,0272,0272,0272,0272,0272,0272,0272,0272,
0272,0272,0272,0272,0272,0272,0272,0271,0271,0271,0271,0271,0271,0271,0271,
0271,0271,0271,0271,0271,0271,0271,0271,0270,0270,0270,0270,0270,0270,0270,
0270,0270,0270,0270,0270,0270,0270,0270,0270,0267,0267,0267,0267,0267,0267,
0267,0267,0267,0267,0267,0267,0267,0267,0267,0267,0266,0266,0266,0266,0266,
0266,0266,0266,0266,0266,0266,0266,0266,0266,0266,0266,0265,0265,0265,0265,
0265,0265,0265,0265,0265,0265,0265,0265,0265,0265,0265,0265,0264,0264,0264,
0264,0264,0264,0264,0264,0264,0264,0264,0264,0264,0264,0264,0264,0263,0263,
0263,0263,0263,0263,0263,0263,0263,0263,0263,0263,0263,0263,0263,0263,0262,
0262,0262,0262,0262,0262,0262,0262,0262,0262,0262,0262,0262,0262,0262,0262,
0262,0261,0261,0261,0261,0261,0261,0261,0261,0261,0261,0261,0261,0261,0261,
0261,0261,0260,0260,0260,0260,0260,0260,0260,0260,0260,0260,0260,0260,0260,
0260,0260,0260,0257,0257,0257,0257,0257,0257,0257,0257,0257,0257,0257,0257,
0257,0257,0257,0257,0257,0257,0257,0257,0257,0257,0257,0257,0257,0257,0257,
0257,0257,0257,0257,0257,0256,0256,0256,0256,0256,0256,0256,0256,0256,0256,
0256,0256,0256,0256,0256,0256,0256,0256,0256,0256,0256,0256,0256,0256,0256,
0256,0256,0256,0256,0256,0256,0256,0255,0255,0255,0255,0255,0255,0255,0255,
0255,0255,0255,0255,0255,0255,0255,0255,0255,0255,0255,0255,0255,0255,0255,
0255,0255,0255,0255,0255,0255,0255,0255,0255,0254,0254,0254,0254,0254,0254,
0254,0254,0254,0254,0254,0254,0254,0254,0254,0254,0254,0254,0254,0254,0254,
0254,0254,0254,0254,0254,0254,0254,0254,0254,0254,0254,0253,0253,0253,0253,
0253,0253,0253,0253,0253,0253,0253,0253,0253,0253,0253,0253,0253,0253,0253,
0253,0253,0253,0253,0253,0253,0253,0253,0253,0253,0253,0253,0253,0252,0252,
0252,0252,0252,0252,0252,0252,0252,0252,0252,0252,0252,0252,0252,0252,0252,
0252,0252,0252,0252,0252,0252,0252,0252,0252,0252,0252,0252,0252,0252,0252,
0251,0251,0251,0251,0251,0251,0251,0251,0251,0251,0251,0251,0251,0251,0251,
0251,0251,0251,0251,0251,0251,0251,0251,0251,0251,0251,0251,0251,0251,0251,
0251,0251,0251,0250,0250,0250,0250,0250,0250,0250,0250,0250,0250,0250,0250,
0250,0250,0250,0250,0250,0250,0250,0250,0250,0250,0250,0250,0250,0250,0250,
0250,0250,0250,0250,0250,0247,0247,0247,0247,0247,0247,0247,0247,0247,0247,
0247,0247,0247,0247,0247,0247,0247,0247,0247,0247,0247,0247,0247,0247,0247,
0247,0247,0247,0247,0247,0247,0247,0246,0246,0246,0246,0246,0246,0246,0246,
0246,0246,0246,0246,0246,0246,0246,0246,0246,0246,0246,0246,0246,0246,0246,
0246,0246,0246,0246,0246,0246,0246,0246,0246,0245,0245,0245,0245,0245,0245,
0245,0245,0245,0245,0245,0245,0245,0245,0245,0245,0245,0245,0245,0245,0245,
0245,0245,0245,0245,0245,0245,0245,0245,0245,0245,0245,0244,0244,0244,0244,
0244,0244,0244,0244,0244,0244,0244,0244,0244,0244,0244,0244,0244,0244,0244,
0244,0244,0244,0244,0244,0244,0244,0244,0244,0244,0244,0244,0244,0243,0243,
0243,0243,0243,0243,0243,0243,0243,0243,0243,0243,0243,0243,0243,0243,0243,
0243,0243,0243,0243,0243,0243,0243,0243,0243,0243,0243,0243,0243,0243,0243,
0242,0242,0242,0242,0242,0242,0242,0242,0242,0242,0242,0242,0242,0242,0242,
0242,0242,0242,0242,0242,0242,0242,0242,0242,0242,0242,0242,0242,0242,0242,
0242,0242,0242,0241,0241,0241,0241,0241,0241,0241,0241,0241,0241,0241,0241,
0241,0241,0241,0241,0241,0241,0241,0241,0241,0241,0241,0241,0241,0241,0241,
0241,0241,0241,0241,0241,0240,0240,0240,0240,0240,0240,0240,0240,0240,0240,
0240,0240,0240,0240,0240,0240,0240,0240,0240,0240,0240,0240,0240,0240,0240,
0240,0240,0240,0240,0240,0240,0240,0237,0237,0237,0237,0237,0237,0237,0237,
0237,0237,0237,0237,0237,0237,0237,0237,0237,0237,0237,0237,0237,0237,0237,
0237,0237,0237,0237,0237,0237,0237,0237,0237,0237,0237,0237,0237,0237,0237,
0237,0237,0237,0237,0237,0237,0237,0237,0237,0237,0237,0237,0237,0237,0237,
0237,0237,0237,0237,0237,0237,0237,0237,0237,0237,0237,0236,0236,0236,0236,
0236,0236,0236,0236,0236,0236,0236,0236,0236,0236,0236,0236,0236,0236,0236,
0236,0236,0236,0236,0236,0236,0236,0236,0236,0236,0236,0236,0236,0236,0236,
0236,0236,0236,0236,0236,0236,0236,0236,0236,0236,0236,0236,0236,0236,0236,
0236,0236,0236,0236,0236,0236,0236,0236,0236,0236,0236,0236,0236,0236,0236,
0235,0235,0235,0235,0235,0235,0235,0235,0235,0235,0235,0235,0235,0235,0235,
0235,0235,0235,0235,0235,0235,0235,0235,0235,0235,0235,0235,0235,0235,0235,
0235,0235,0235,0235,0235,0235,0235,0235,0235,0235,0235,0235,0235,0235,0235,
0235,0235,0235,0235,0235,0235,0235,0235,0235,0235,0235,0235,0235,0235,0235,
0235,0235,0235,0235,0235,0234,0234,0234,0234,0234,0234,0234,0234,0234,0234,
0234,0234,0234,0234,0234,0234,0234,0234,0234,0234,0234,0234,0234,0234,0234,
0234,0234,0234,0234,0234,0234,0234,0234,0234,0234,0234,0234,0234,0234,0234,
0234,0234,0234,0234,0234,0234,0234,0234,0234,0234,0234,0234,0234,0234,0234,
0234,0234,0234,0234,0234,0234,0234,0234,0234,0233,0233,0233,0233,0233,0233,
0233,0233,0233,0233,0233,0233,0233,0233,0233,0233,0233,0233,0233,0233,0233,
0233,0233,0233,0233,0233,0233,0233,0233,0233,0233,0233,0233,0233,0233,0233,
0233,0233,0233,0233,0233,0233,0233,0233,0233,0233,0233,0233,0233,0233,0233,
0233,0233,0233,0233,0233,0233,0233,0233,0233,0233,0233,0233,0233,0232,0232,
0232,0232,0232,0232,0232,0232,0232,0232,0232,0232,0232,0232,0232,0232,0232,
0232,0232,0232,0232,0232,0232,0232,0232,0232,0232,0232,0232,0232,0232,0232,
0232,0232,0232,0232,0232,0232,0232,0232,0232,0232,0232,0232,0232,0232,0232,
0232,0232,0232,0232,0232,0232,0232,0232,0232,0232,0232,0232,0232,0232,0232,
0232,0232,0231,0231,0231,0231,0231,0231,0231,0231,0231,0231,0231,0231,0231,
0231,0231,0231,0231,0231,0231,0231,0231,0231,0231,0231,0231,0231,0231,0231,
0231,0231,0231,0231,0231,0231,0231,0231,0231,0231,0231,0231,0231,0231,0231,
0231,0231,0231,0231,0231,0231,0231,0231,0231,0231,0231,0231,0231,0231,0231,
0231,0231,0231,0231,0231,0231,0231,0230,0230,0230,0230,0230,0230,0230,0230,
0230,0230,0230,0230,0230,0230,0230,0230,0230,0230,0230,0230,0230,0230,0230,
0230,0230,0230,0230,0230,0230,0230,0230,0230,0230,0230,0230,0230,0230,0230,
0230,0230,0230,0230,0230,0230,0230,0230,0230,0230,0230,0230,0230,0230,0230,
0230,0230,0230,0230,0230,0230,0230,0230,0230,0230,0230,0227,0227,0227,0227,
0227,0227,0227,0227,0227,0227,0227,0227,0227,0227,0227,0227,0227,0227,0227,
0227,0227,0227,0227,0227,0227,0227,0227,0227,0227,0227,0227,0227,0227,0227,
0227,0227,0227,0227,0227,0227,0227,0227,0227,0227,0227,0227,0227,0227,0227,
0227,0227,0227,0227,0227,0227,0227,0227,0227,0227,0227,0227,0227,0227,0227,
0226,0226,0226,0226,0226,0226,0226,0226,0226,0226,0226,0226,0226,0226,0226,
0226,0226,0226,0226,0226,0226,0226,0226,0226,0226,0226,0226,0226,0226,0226,
0226,0226,0226,0226,0226,0226,0226,0226,0226,0226,0226,0226,0226,0226,0226,
0226,0226,0226,0226,0226,0226,0226,0226,0226,0226,0226,0226,0226,0226,0226,
0226,0226,0226,0226,0225,0225,0225,0225,0225,0225,0225,0225,0225,0225,0225,
0225,0225,0225,0225,0225,0225,0225,0225,0225,0225,0225,0225,0225,0225,0225,
0225,0225,0225,0225,0225,0225,0225,0225,0225,0225,0225,0225,0225,0225,0225,
0225,0225,0225,0225,0225,0225,0225,0225,0225,0225,0225,0225,0225,0225,0225,
0225,0225,0225,0225,0225,0225,0225,0225,0225,0224,0224,0224,0224,0224,0224,
0224,0224,0224,0224,0224,0224,0224,0224,0224,0224,0224,0224,0224,0224,0224,
0224,0224,0224,0224,0224,0224,0224,0224,0224,0224,0224,0224,0224,0224,0224,
0224,0224,0224,0224,0224,0224,0224,0224,0224,0224,0224,0224,0224,0224,0224,
0224,0224,0224,0224,0224,0224,0224,0224,0224,0224,0224,0224,0224,0223,0223,
0223,0223,0223,0223,0223,0223,0223,0223,0223,0223,0223,0223,0223,0223,0223,
0223,0223,0223,0223,0223,0223,0223,0223,0223,0223,0223,0223,0223,0223,0223,
0223,0223,0223,0223,0223,0223,0223,0223,0223,0223,0223,0223,0223,0223,0223,
0223,0223,0223,0223,0223,0223,0223,0223,0223,0223,0223,0223,0223,0223,0223,
0223,0223,0222,0222,0222,0222,0222,0222,0222,0222,0222,0222,0222,0222,0222,
0222,0222,0222,0222,0222,0222,0222,0222,0222,0222,0222,0222,0222,0222,0222,
0222,0222,0222,0222,0222,0222,0222,0222,0222,0222,0222,0222,0222,0222,0222,
0222,0222,0222,0222,0222,0222,0222,0222,0222,0222,0222,0222,0222,0222,0222,
0222,0222,0222,0222,0222,0222,0221,0221,0221,0221,0221,0221,0221,0221,0221,
0221,0221,0221,0221,0221,0221,0221,0221,0221,0221,0221,0221,0221,0221,0221,
0221,0221,0221,0221,0221,0221,0221,0221,0221,0221,0221,0221,0221,0221,0221,
0221,0221,0221,0221,0221,0221,0221,0221,0221,0221,0221,0221,0221,0221,0221,
0221,0221,0221,0221,0221,0221,0221,0221,0221,0221,0221,0220,0220,0220,0220,
0220,0220,0220,0220,0220,0220,0220,0220,0220,0220,0220,0220,0220,0220,0220,
0220,0220,0220,0220,0220,0220,0220,0220,0220,0220,0220,0220,0220,0220,0220,
0220,0220,0220,0220,0220,0220,0220,0220,0220,0220,0220,0220,0220,0220,0220,
0220,0220,0220,0220,0220,0220,0220,0220,0220,0220,0220,0220,0220,0220,0220,
0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,
0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,
0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,
0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,
0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,
0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,
0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,
0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,0217,
0217,0217,0217,0217,0217,0217,0217,0217,0217,0216,0216,0216,0216,0216,0216,
0216,0216,0216,0216,0216,0216,0216,0216,0216,0216,0216,0216,0216,0216,0216,
0216,0216,0216,0216,0216,0216,0216,0216,0216,0216,0216,0216,0216,0216,0216,
0216,0216,0216,0216,0216,0216,0216,0216,0216,0216,0216,0216,0216,0216,0216,
0216,0216,0216,0216,0216,0216,0216,0216,0216,0216,0216,0216,0216,0216,0216,
0216,0216,0216,0216,0216,0216,0216,0216,0216,0216,0216,0216,0216,0216,0216,