teensy-audio/ulaw.c

#include <stdint.h>

const int16_t ulaw_decode_table[256] = {
     0,     8,    16,    24,    32,    40,    48,    56,    64,    72,
    80,    88,    96,   104,   112,   120,   128,   144,   160,   176,
   192,   208,   224,   240,   256,   272,   288,   304,   320,   336,
   352,   368,   384,   416,   448,   480,   512,   544,   576,   608,
   640,   672,   704,   736,   768,   800,   832,   864,   896,   960,
  1024,  1088,  1152,  1216,  1280,  1344,  1408,  1472,  1536,  1600,
  1664,  1728,  1792,  1856,  1920,  2048,  2176,  2304,  2432,  2560,
  2688,  2816,  2944,  3072,  3200,  3328,  3456,  3584,  3712,  3840,
  3968,  4224,  4480,  4736,  4992,  5248,  5504,  5760,  6016,  6272,
  6528,  6784,  7040,  7296,  7552,  7808,  8064,  8576,  9088,  9600,
 10112, 10624, 11136, 11648, 12160, 12672, 13184, 13696, 14208, 14720,
 15232, 15744, 16256, 17280, 18304, 19328, 20352, 21376, 22400, 23424,
 24448, 25472, 26496, 27520, 28544, 29568, 30592, 31616,     0,    -8,
   -16,   -24,   -32,   -40,   -48,   -56,   -64,   -72,   -80,   -88,
   -96,  -104,  -112,  -120,  -128,  -144,  -160,  -176,  -192,  -208,
  -224,  -240,  -256,  -272,  -288,  -304,  -320,  -336,  -352,  -368,
  -384,  -416,  -448,  -480,  -512,  -544,  -576,  -608,  -640,  -672,
  -704,  -736,  -768,  -800,  -832,  -864,  -896,  -960, -1024, -1088,
 -1152, -1216, -1280, -1344, -1408, -1472, -1536, -1600, -1664, -1728,
 -1792, -1856, -1920, -2048, -2176, -2304, -2432, -2560, -2688, -2816,
 -2944, -3072, -3200, -3328, -3456, -3584, -3712, -3840, -3968, -4224,
 -4480, -4736, -4992, -5248, -5504, -5760, -6016, -6272, -6528, -6784,
 -7040, -7296, -7552, -7808, -8064, -8576, -9088, -9600,-10112,-10624,
-11136,-11648,-12160,-12672,-13184,-13696,-14208,-14720,-15232,-15744,
-16256,-17280,-18304,-19328,-20352,-21376,-22400,-23424,-24448,-25472,
-26496,-27520,-28544,-29568,-30592,-31616
};
/*
#! /usr/bin/perl
print "const int16_t ulaw_decode_table[256] = {\n";
for ($i=0; $i < 256; $i++) {
	$r = ($i >> 4) & 7;
	$n = ($i & 0xF) << ($r + 3);
	$n |= 1 << ($r + 7);
	$n -= 128;
	$n *= -1 if $i > 127;
        printf "%6d", $n + 0;
        print "," if ($i < 255);
        print "\n" if ($i % 10) == 9;
}
print "\n};\n";
*/