visus
/
teensy-audio
Watch 1
Star 0
Fork 0
Code Issues 0 Pull Requests 0 Releases 0 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
560 Commits
2 Branches
Tree: 28c676b4bb
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '28c676b4bb'
${ noResults }
teensy-audio/data_ulaw.c

121 lines
5.7KB
Raw Blame History 

  1. /* Audio Library for Teensy 3.X

  2.  * Copyright (c) 2014, Paul Stoffregen, paul@pjrc.com

  3.  *

  4.  * Development of this audio library was funded by PJRC.COM, LLC by sales of

  5.  * Teensy and Audio Adaptor boards.  Please support PJRC's efforts to develop

  6.  * open source software by purchasing Teensy or other PJRC products.

  7.  *

  8.  * Permission is hereby granted, free of charge, to any person obtaining a copy

  9.  * of this software and associated documentation files (the "Software"), to deal

  10.  * in the Software without restriction, including without limitation the rights

  11.  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

  12.  * copies of the Software, and to permit persons to whom the Software is

  13.  * furnished to do so, subject to the following conditions:

  14.  *

  15.  * The above copyright notice, development funding notice, and this permission

  16.  * notice shall be included in all copies or substantial portions of the Software.

  17.  *

  18.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

  19.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

  20.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

  21.  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

  22.  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

  23.  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

  24.  * THE SOFTWARE.

  25.  */

  26. 

  27. #include <stdint.h>

  28. 

  29. const int16_t ulaw_decode_table[256] = {

  30.      4,    12,    20,    28,    36,    44,    52,    60,    68,    76,

  31.     84,    92,   100,   108,   116,   124,   136,   152,   168,   184,

  32.    200,   216,   232,   248,   264,   280,   296,   312,   328,   344,

  33.    360,   376,   400,   432,   464,   496,   528,   560,   592,   624,

  34.    656,   688,   720,   752,   784,   816,   848,   880,   928,   992,

  35.   1056,  1120,  1184,  1248,  1312,  1376,  1440,  1504,  1568,  1632,

  36.   1696,  1760,  1824,  1888,  1984,  2112,  2240,  2368,  2496,  2624,

  37.   2752,  2880,  3008,  3136,  3264,  3392,  3520,  3648,  3776,  3904,

  38.   4096,  4352,  4608,  4864,  5120,  5376,  5632,  5888,  6144,  6400,

  39.   6656,  6912,  7168,  7424,  7680,  7936,  8320,  8832,  9344,  9856,

  40.  10368, 10880, 11392, 11904, 12416, 12928, 13440, 13952, 14464, 14976,

  41.  15488, 16000, 16768, 17792, 18816, 19840, 20864, 21888, 22912, 23936,

  42.  24960, 25984, 27008, 28032, 29056, 30080, 31104, 32128,    -4,   -12,

  43.    -20,   -28,   -36,   -44,   -52,   -60,   -68,   -76,   -84,   -92,

  44.   -100,  -108,  -116,  -124,  -136,  -152,  -168,  -184,  -200,  -216,

  45.   -232,  -248,  -264,  -280,  -296,  -312,  -328,  -344,  -360,  -376,

  46.   -400,  -432,  -464,  -496,  -528,  -560,  -592,  -624,  -656,  -688,

  47.   -720,  -752,  -784,  -816,  -848,  -880,  -928,  -992, -1056, -1120,

  48.  -1184, -1248, -1312, -1376, -1440, -1504, -1568, -1632, -1696, -1760,

  49.  -1824, -1888, -1984, -2112, -2240, -2368, -2496, -2624, -2752, -2880,

  50.  -3008, -3136, -3264, -3392, -3520, -3648, -3776, -3904, -4096, -4352,

  51.  -4608, -4864, -5120, -5376, -5632, -5888, -6144, -6400, -6656, -6912,

  52.  -7168, -7424, -7680, -7936, -8320, -8832, -9344, -9856,-10368,-10880,

  53. -11392,-11904,-12416,-12928,-13440,-13952,-14464,-14976,-15488,-16000,

  54. -16768,-17792,-18816,-19840,-20864,-21888,-22912,-23936,-24960,-25984,

  55. -27008,-28032,-29056,-30080,-31104,-32128

  56. };

  57. /*

  58. #! /usr/bin/perl

  59. print "const int16_t ulaw_decode_table[256] = {\n";

  60. for ($i=0; $i < 256; $i++) {

  61. 	$r = ($i >> 4) & 7;

  62. 	$n = ($i & 0xF) << ($r + 3);

  63. 	$n |= 1 << ($r + 7);

  64. 	$n |= 1 << ($r + 2);

  65. 	$n -= 128;

  66. 	$n *= -1 if $i > 127;

  67.         printf "%6d", $n + 0;

  68.         print "," if ($i < 255);

  69.         print "\n" if ($i % 10) == 9;

  70. }

  71. print "\n};\n";

  72. */

  73. 

  74. 

  75. 

  76. /*

  77. const int16_t ulaw_decode_table[256] = {

  78.      0,     8,    16,    24,    32,    40,    48,    56,    64,    72,

  79.     80,    88,    96,   104,   112,   120,   128,   144,   160,   176,

  80.    192,   208,   224,   240,   256,   272,   288,   304,   320,   336,

  81.    352,   368,   384,   416,   448,   480,   512,   544,   576,   608,

  82.    640,   672,   704,   736,   768,   800,   832,   864,   896,   960,

  83.   1024,  1088,  1152,  1216,  1280,  1344,  1408,  1472,  1536,  1600,

  84.   1664,  1728,  1792,  1856,  1920,  2048,  2176,  2304,  2432,  2560,

  85.   2688,  2816,  2944,  3072,  3200,  3328,  3456,  3584,  3712,  3840,

  86.   3968,  4224,  4480,  4736,  4992,  5248,  5504,  5760,  6016,  6272,

  87.   6528,  6784,  7040,  7296,  7552,  7808,  8064,  8576,  9088,  9600,

  88.  10112, 10624, 11136, 11648, 12160, 12672, 13184, 13696, 14208, 14720,

  89.  15232, 15744, 16256, 17280, 18304, 19328, 20352, 21376, 22400, 23424,

  90.  24448, 25472, 26496, 27520, 28544, 29568, 30592, 31616,     0,    -8,

  91.    -16,   -24,   -32,   -40,   -48,   -56,   -64,   -72,   -80,   -88,

  92.    -96,  -104,  -112,  -120,  -128,  -144,  -160,  -176,  -192,  -208,

  93.   -224,  -240,  -256,  -272,  -288,  -304,  -320,  -336,  -352,  -368,

  94.   -384,  -416,  -448,  -480,  -512,  -544,  -576,  -608,  -640,  -672,

  95.   -704,  -736,  -768,  -800,  -832,  -864,  -896,  -960, -1024, -1088,

  96.  -1152, -1216, -1280, -1344, -1408, -1472, -1536, -1600, -1664, -1728,

  97.  -1792, -1856, -1920, -2048, -2176, -2304, -2432, -2560, -2688, -2816,

  98.  -2944, -3072, -3200, -3328, -3456, -3584, -3712, -3840, -3968, -4224,

  99.  -4480, -4736, -4992, -5248, -5504, -5760, -6016, -6272, -6528, -6784,

  100.  -7040, -7296, -7552, -7808, -8064, -8576, -9088, -9600,-10112,-10624,

  101. -11136,-11648,-12160,-12672,-13184,-13696,-14208,-14720,-15232,-15744,

  102. -16256,-17280,-18304,-19328,-20352,-21376,-22400,-23424,-24448,-25472,

  103. -26496,-27520,-28544,-29568,-30592,-31616

  104. };

  105. */

  106. /*

  107. #! /usr/bin/perl

  108. print "const int16_t ulaw_decode_table[256] = {\n";

  109. for ($i=0; $i < 256; $i++) {

  110. 	$r = ($i >> 4) & 7;

  111. 	$n = ($i & 0xF) << ($r + 3);

  112. 	$n |= 1 << ($r + 7);

  113. 	$n -= 128;

  114. 	$n *= -1 if $i > 127;

  115.         printf "%6d", $n + 0;

  116.         print "," if ($i < 255);

  117.         print "\n" if ($i % 10) == 9;

  118. }

  119. print "\n};\n";

  120. */