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teensy-audio/data_waveforms.c

277 linhas
13KB
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  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. // These audio waveforms have a period of 256 points, plus a 257th

  30. // point that is a duplicate of the first point.  This duplicate

  31. // is needed because the waveform generator uses linear interpolation

  32. // between each point and the next point in the waveform.

  33. 

  34. const int16_t AudioWaveformSine[257] = {

  35.      0,   804,  1608,  2410,  3212,  4011,  4808,  5602,  6393,  7179,

  36.   7962,  8739,  9512, 10278, 11039, 11793, 12539, 13279, 14010, 14732,

  37.  15446, 16151, 16846, 17530, 18204, 18868, 19519, 20159, 20787, 21403,

  38.  22005, 22594, 23170, 23731, 24279, 24811, 25329, 25832, 26319, 26790,

  39.  27245, 27683, 28105, 28510, 28898, 29268, 29621, 29956, 30273, 30571,

  40.  30852, 31113, 31356, 31580, 31785, 31971, 32137, 32285, 32412, 32521,

  41.  32609, 32678, 32728, 32757, 32767, 32757, 32728, 32678, 32609, 32521,

  42.  32412, 32285, 32137, 31971, 31785, 31580, 31356, 31113, 30852, 30571,

  43.  30273, 29956, 29621, 29268, 28898, 28510, 28105, 27683, 27245, 26790,

  44.  26319, 25832, 25329, 24811, 24279, 23731, 23170, 22594, 22005, 21403,

  45.  20787, 20159, 19519, 18868, 18204, 17530, 16846, 16151, 15446, 14732,

  46.  14010, 13279, 12539, 11793, 11039, 10278,  9512,  8739,  7962,  7179,

  47.   6393,  5602,  4808,  4011,  3212,  2410,  1608,   804,     0,  -804,

  48.  -1608, -2410, -3212, -4011, -4808, -5602, -6393, -7179, -7962, -8739,

  49.  -9512,-10278,-11039,-11793,-12539,-13279,-14010,-14732,-15446,-16151,

  50. -16846,-17530,-18204,-18868,-19519,-20159,-20787,-21403,-22005,-22594,

  51. -23170,-23731,-24279,-24811,-25329,-25832,-26319,-26790,-27245,-27683,

  52. -28105,-28510,-28898,-29268,-29621,-29956,-30273,-30571,-30852,-31113,

  53. -31356,-31580,-31785,-31971,-32137,-32285,-32412,-32521,-32609,-32678,

  54. -32728,-32757,-32767,-32757,-32728,-32678,-32609,-32521,-32412,-32285,

  55. -32137,-31971,-31785,-31580,-31356,-31113,-30852,-30571,-30273,-29956,

  56. -29621,-29268,-28898,-28510,-28105,-27683,-27245,-26790,-26319,-25832,

  57. -25329,-24811,-24279,-23731,-23170,-22594,-22005,-21403,-20787,-20159,

  58. -19519,-18868,-18204,-17530,-16846,-16151,-15446,-14732,-14010,-13279,

  59. -12539,-11793,-11039,-10278, -9512, -8739, -7962, -7179, -6393, -5602,

  60.  -4808, -4011, -3212, -2410, -1608,  -804,     0

  61. };

  62. 

  63. #if 0

  64. #! /usr/bin/perl

  65. use Math::Trig ':pi';

  66. $len = 256;

  67. print "const int16_t AudioWaveformSine[257] = {\n";

  68. for ($i=0; $i <= $len; $i++) {

  69.         $f = sin($i / $len * 2 * pi);

  70.         $d = sprintf "%.0f", $f * 32767.0;

  71.         #print $d;

  72.         printf "%6d", $d + 0;

  73.         print "," if ($i < $len);

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

  75. }

  76. print "\n" unless ($len % 10) == 9;

  77. print "};\n";

  78. #endif

  79. 

  80. const int16_t AudioWaveformTriangle[257] = {

  81.      0,   512,  1024,  1536,  2048,  2560,  3072,  3584,  4096,  4608,

  82.   5120,  5632,  6144,  6656,  7168,  7680,  8192,  8704,  9216,  9728,

  83.  10240, 10752, 11264, 11776, 12288, 12800, 13312, 13824, 14336, 14848,

  84.  15360, 15872, 16384, 16895, 17407, 17919, 18431, 18943, 19455, 19967,

  85.  20479, 20991, 21503, 22015, 22527, 23039, 23551, 24063, 24575, 25087,

  86.  25599, 26111, 26623, 27135, 27647, 28159, 28671, 29183, 29695, 30207,

  87.  30719, 31231, 31743, 32255, 32767, 32255, 31743, 31231, 30719, 30207,

  88.  29695, 29183, 28671, 28159, 27647, 27135, 26623, 26111, 25599, 25087,

  89.  24575, 24063, 23551, 23039, 22527, 22015, 21503, 20991, 20479, 19967,

  90.  19455, 18943, 18431, 17919, 17407, 16895, 16384, 15872, 15360, 14848,

  91.  14336, 13824, 13312, 12800, 12288, 11776, 11264, 10752, 10240,  9728,

  92.   9216,  8704,  8192,  7680,  7168,  6656,  6144,  5632,  5120,  4608,

  93.   4096,  3584,  3072,  2560,  2048,  1536,  1024,   512,     0,  -512,

  94.  -1024, -1536, -2048, -2560, -3072, -3584, -4096, -4608, -5120, -5632,

  95.  -6144, -6656, -7168, -7680, -8192, -8704, -9216, -9728,-10240,-10752,

  96. -11264,-11776,-12288,-12800,-13312,-13824,-14336,-14848,-15360,-15872,

  97. -16384,-16895,-17407,-17919,-18431,-18943,-19455,-19967,-20479,-20991,

  98. -21503,-22015,-22527,-23039,-23551,-24063,-24575,-25087,-25599,-26111,

  99. -26623,-27135,-27647,-28159,-28671,-29183,-29695,-30207,-30719,-31231,

  100. -31743,-32255,-32767,-32255,-31743,-31231,-30719,-30207,-29695,-29183,

  101. -28671,-28159,-27647,-27135,-26623,-26111,-25599,-25087,-24575,-24063,

  102. -23551,-23039,-22527,-22015,-21503,-20991,-20479,-19967,-19455,-18943,

  103. -18431,-17919,-17407,-16895,-16384,-15872,-15360,-14848,-14336,-13824,

  104. -13312,-12800,-12288,-11776,-11264,-10752,-10240, -9728, -9216, -8704,

  105.  -8192, -7680, -7168, -6656, -6144, -5632, -5120, -4608, -4096, -3584,

  106.  -3072, -2560, -2048, -1536, -1024,  -512,     0

  107. };

  108. 

  109. #if 0

  110. #! /usr/bin/perl

  111. $len = 256;

  112. print "const int16_t AudioWaveformTriangle[257] = {\n";

  113. for ($i=0; $i <= $len; $i++) {

  114. 

  115.         $f = 0;

  116.         if ($i < $len / 4) {

  117.                 $f = $i / ($len / 4);

  118.         } elsif ($i < $len * 3 / 4) {

  119.                 $f = 2 - $i / ($len / 4);

  120.         } else {

  121.                 $f = $i / ($len / 4) - 4;

  122.                 #print "$i  $f\n";

  123.         }

  124.         $d = sprintf "%.0f", $f * 32767.0;

  125.         printf "%6d", $d + 0;

  126.         print "," if ($i < $len);

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

  128. }

  129. print "\n" unless ($len % 10) == 9;

  130. print "};\n";

  131. #endif

  132. 

  133. const int16_t AudioWaveformSquare[257] = {

  134.  32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767,

  135.  32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767,

  136.  32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767,

  137.  32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767,

  138.  32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767,

  139.  32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767,

  140.  32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767,

  141.  32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767,

  142.  32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767,

  143.  32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767,

  144.  32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767,

  145.  32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767,

  146.  32767, 32767, 32767, 32767, 32767, 32767, 32767, 32767,-32767,-32767,

  147. -32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,

  148. -32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,

  149. -32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,

  150. -32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,

  151. -32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,

  152. -32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,

  153. -32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,

  154. -32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,

  155. -32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,

  156. -32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,

  157. -32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,

  158. -32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,-32767,

  159. -32767,-32767,-32767,-32767,-32767,-32767, 32767

  160. };

  161. 

  162. #if 0

  163. #! /usr/bin/perl

  164. $len = 256;

  165. print "const int16_t AudioWaveformSquare[257] = {\n";

  166. for ($i=0; $i <= $len; $i++) {

  167.         $f = 1.0;

  168.         if ($i < $len / 2) {

  169.                 $f = 1.0;

  170.         } elsif ($i < $len) {

  171.                 $f = -1.0;

  172.         } 

  173.         $d = sprintf "%.0f", $f * 32767.0;

  174.         printf "%6d", $d + 0;

  175.         print "," if ($i < $len);

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

  177. }

  178. print "\n" unless ($len % 10) == 9;

  179. print "};\n";

  180. #endif

  181. 

  182. const int16_t AudioWaveformSawtooth[257] = {

  183.      0,   256,   512,   768,  1024,  1280,  1536,  1792,  2048,  2304,

  184.   2560,  2816,  3072,  3328,  3584,  3840,  4096,  4352,  4608,  4864,

  185.   5120,  5376,  5632,  5888,  6144,  6400,  6656,  6912,  7168,  7424,

  186.   7680,  7936,  8192,  8448,  8704,  8960,  9216,  9472,  9728,  9984,

  187.  10240, 10496, 10752, 11008, 11264, 11520, 11776, 12032, 12288, 12544,

  188.  12800, 13056, 13312, 13568, 13824, 14080, 14336, 14592, 14848, 15104,

  189.  15360, 15616, 15872, 16128, 16384, 16639, 16895, 17151, 17407, 17663,

  190.  17919, 18175, 18431, 18687, 18943, 19199, 19455, 19711, 19967, 20223,

  191.  20479, 20735, 20991, 21247, 21503, 21759, 22015, 22271, 22527, 22783,

  192.  23039, 23295, 23551, 23807, 24063, 24319, 24575, 24831, 25087, 25343,

  193.  25599, 25855, 26111, 26367, 26623, 26879, 27135, 27391, 27647, 27903,

  194.  28159, 28415, 28671, 28927, 29183, 29439, 29695, 29951, 30207, 30463,

  195.  30719, 30975, 31231, 31487, 31743, 31999, 32255, 32511,-32767,-32511,

  196. -32255,-31999,-31743,-31487,-31231,-30975,-30719,-30463,-30207,-29951,

  197. -29695,-29439,-29183,-28927,-28671,-28415,-28159,-27903,-27647,-27391,

  198. -27135,-26879,-26623,-26367,-26111,-25855,-25599,-25343,-25087,-24831,

  199. -24575,-24319,-24063,-23807,-23551,-23295,-23039,-22783,-22527,-22271,

  200. -22015,-21759,-21503,-21247,-20991,-20735,-20479,-20223,-19967,-19711,

  201. -19455,-19199,-18943,-18687,-18431,-18175,-17919,-17663,-17407,-17151,

  202. -16895,-16639,-16384,-16128,-15872,-15616,-15360,-15104,-14848,-14592,

  203. -14336,-14080,-13824,-13568,-13312,-13056,-12800,-12544,-12288,-12032,

  204. -11776,-11520,-11264,-11008,-10752,-10496,-10240, -9984, -9728, -9472,

  205.  -9216, -8960, -8704, -8448, -8192, -7936, -7680, -7424, -7168, -6912,

  206.  -6656, -6400, -6144, -5888, -5632, -5376, -5120, -4864, -4608, -4352,

  207.  -4096, -3840, -3584, -3328, -3072, -2816, -2560, -2304, -2048, -1792,

  208.  -1536, -1280, -1024,  -768,  -512,  -256,     0

  209. };

  210. 

  211. #if 0

  212. #! /usr/bin/perl

  213. $len = 256;

  214. print "const int16_t AudioWaveformSawtooth[257] = {\n";

  215. for ($i=0; $i <= $len; $i++) {

  216.         $f = 0;

  217.         if ($i < $len / 2) {

  218.                 $f = $i / $len * 2;

  219.         } else {

  220.                 $f = -2 + $i / $len * 2;

  221.                 #print "$i  $f\n";

  222.         }

  223.         $d = sprintf "%.0f", $f * 32767.0;

  224.         printf "%6d", $d + 0;

  225.         print "," if ($i < $len);

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

  227. }

  228. print "\n" unless ($len % 10) == 9;

  229. print "};\n";

  230. #endif

  231. 

  232. 

  233. 

  234. const int16_t fader_table[257] = {

  235.     0,    1,    4,   11,   19,   30,   44,   60,   78,   99,

  236.   123,  149,  177,  208,  241,  276,  314,  355,  398,  443,

  237.   490,  541,  593,  648,  705,  764,  826,  891,  957, 1026,

  238.  1097, 1171, 1247, 1325, 1405, 1488, 1572, 1660, 1749, 1840,

  239.  1934, 2030, 2128, 2228, 2330, 2435, 2541, 2650, 2761, 2873,

  240.  2988, 3105, 3224, 3344, 3467, 3592, 3718, 3847, 3977, 4109,

  241.  4243, 4379, 4517, 4657, 4798, 4941, 5086, 5232, 5380, 5530,

  242.  5682, 5835, 5989, 6145, 6303, 6462, 6623, 6785, 6949, 7114,

  243.  7281, 7448, 7618, 7788, 7960, 8133, 8307, 8483, 8660, 8838,

  244.  9017, 9197, 9378, 9560, 9743, 9928,10113,10299,10486,10674,

  245. 10863,11053,11244,11435,11627,11820,12013,12207,12402,12597,

  246. 12793,12989,13186,13384,13582,13780,13979,14178,14377,14577,

  247. 14777,14977,15177,15378,15579,15780,15981,16182,16383,16584,

  248. 16785,16986,17187,17387,17588,17788,17989,18188,18388,18588,

  249. 18787,18985,19184,19382,19579,19776,19972,20168,20364,20558,

  250. 20752,20946,21139,21331,21522,21712,21902,22091,22279,22466,

  251. 22652,22838,23022,23205,23388,23569,23749,23928,24106,24283,

  252. 24458,24633,24806,24977,25148,25317,25485,25651,25817,25980,

  253. 26142,26303,26463,26620,26776,26931,27084,27236,27385,27534,

  254. 27680,27825,27968,28109,28249,28386,28522,28656,28789,28919,

  255. 29048,29174,29299,29422,29542,29661,29778,29893,30006,30116,

  256. 30225,30331,30436,30538,30638,30736,30832,30926,31017,31107,

  257. 31194,31279,31361,31442,31520,31596,31669,31740,31809,31876,

  258. 31940,32002,32062,32119,32174,32226,32276,32324,32369,32412,

  259. 32452,32490,32526,32559,32590,32618,32644,32667,32688,32707,

  260. 32723,32737,32748,32756,32763,32766,32767

  261. };

  262. #if 0

  263. #! /usr/bin/perl

  264. print "const int16_t fader_table[257] = {\n";

  265. $len = 256;

  266. for ($i=0; $i < $len+1; $i++) {

  267.         $a = cos(3.14149 * $i / $len);

  268.         $in = (1 - $a) / 2;

  269.         $d = $in * 32768;

  270.         $d = 32767 if $d >= 32767.5;

  271.         printf "%5d", $d;

  272.         print "," if ($i < $len);

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

  274. }

  275. print "\n};\n";

  276. #endif