API tools faq
paste
Advertisement
Guest User

Untitled

a guest
Dec 9th, 2017
801
0
Never
Add comment
Not a member of Pastebin yet? Sign Up, it unlocks many cool features!
text 11.57 KB | None | 0 0
raw download clone embed print report
  1. require('console.log');
  2.  
  3. let keys = ["cb","c","c#","db","d","eb","e","f","f#","gb","g","a","ab","bb","b",
  4. "a#m","d#m","g#m","c#m","f#m","bm","em","am","dm","gm","cm","fm","bbm","ebm","abm"];
  5.  
  6. let keys_major = ["cb","c","c#","db","d","eb","e","f","f#","gb","g","a","ab","bb","b"];
  7. let keys_minor = ["a#m","d#m","g#m","c#m","f#m","bm","em","am","dm","gm","cm","fm","bbm","ebm","abm"];
  8.  
  9. let barlength = 1024;
  10. let numbars = 80;
  11. let progression = [];
  12. let maxlength = barlength*numbars;
  13.  
  14. let onlyminor = true;
  15. let onlymajor = false;
  16. let key = onlymajor?keys_major[Math.floor(Math.random()*keys_major.length)]:onlyminor?keys_minor[Math.floor(Math.random()*keys_minor.length)]:keys[Math.floor(Math.random()*keys.length)];
  17. let keychanges = [];
  18. let blockchords = true;
  19.  
  20. let I = [];
  21. let II = [];
  22. let III = [];
  23. let IV = [];
  24. let V = [];
  25. let VI = [];
  26. let VII = [];
  27.  
  28. let scale = [];
  29.  
  30. let allowedchords = [1,4,5];
  31.  
  32.  
  33. init();
  34.  
  35. function updateScales(){
  36. console.log("Updating scales - " + key);
  37. //Major
  38. if(key == "cb") scale = ["cb", "db", "eb", "fb", "gb", "ab", "bb"];
  39. if(key == "c") scale = ["c", "d", "e", "f", "g", "a", "b"];
  40. if(key == "c#") scale = ["c#", "d#", "e#", "f#", "g#", "a#", "b#"];
  41. if(key == "db") scale = ["db", "eb", "f", "gb", "ab", "bb", "c"];
  42. if(key == "d") scale = ["d", "e", "f#", "g", "a", "b", "c#"];
  43. if(key == "e") scale = ["e", "f#", "g#", "a", "b", "c#", "d#"];
  44. if(key == "eb") scale = ["eb", "f", "g", "ab", "bb", "c", "d"];
  45. if(key == "f") scale = ["f", "g", "a", "bb", "c", "d", "e"];
  46. if(key == "f#") scale = ["f#", "g#", "a#", "b","c#", "d#", "e#"];
  47. if(key == "gb") scale = ["gb", "ab", "bb","cb", "db", "eb", "f"];
  48. if(key == "g") scale = ["g", "a", "b","c", "d", "e", "f#"];
  49. if(key == "a") scale = ["a", "b","c#", "d", "e", "f#", "g#"];
  50. if(key == "ab") scale = ["ab", "bb","c", "db", "eb", "f", "g"];
  51. if(key == "bb") scale = ["bb","c", "d", "eb", "f", "g", "a"];
  52. if(key == "b") scale = ["b","c#", "d#", "e", "f#", "g#", "a#"];
  53.  
  54. //Minor
  55. if(key == "a#m") scale = ["a", "a#", "b#","c#", "d#", "e#", "f#"];
  56. if(key == "d#m") scale = ["d#", "e#", "f#", "g#", "a#", "b","d"];
  57. if(key == "g#m") scale = ["g", "g#", "a#", "b","c#", "d#", "e"];
  58. if(key == "c#m") scale = ["c#", "d#", "e", "f#", "g#", "a", "c"];
  59. if(key == "f#m") scale = ["f#", "g#", "a", "b","c#", "d", "f"];
  60. if(key == "bm") scale = ["b","c#", "d", "e", "f#", "g", "a#"];
  61. if(key == "em") scale = ["e", "f#", "g", "a", "b","c", "d#"];
  62. if(key == "am") scale = ["a", "b","c", "d", "e", "f", "g#"];
  63. if(key == "dm") scale = ["d", "e", "f", "g", "a", "bb","c#"];
  64. if(key == "gm") scale = ["g", "a", "bb","c", "d", "eb", "f#"];
  65. if(key == "cm") scale = ["c", "d", "eb", "f", "g", "ab", "b"];
  66. if(key == "fm") scale = ["f", "g", "ab", "bb","c", "db", "e"];
  67. if(key == "bbm") scale = ["bb","c", "db", "eb", "f", "gb", "a"];
  68. if(key == "ebm") scale = ["eb", "f", "gb", "ab", "bb","cb", "d"];
  69. if(key == "abm") scale = ["ab", "bb","cb", "db", "eb", "fb", "g"];
  70.  
  71. I = [scale[0], scale[2], scale[4]];
  72. II = [scale[1], scale[3], scale[5]];
  73. III = [scale[2], scale[4], scale[6]];
  74. IV = [scale[3], scale[5], scale[0]];
  75. V = [scale[4], scale[6], scale[1]];
  76. VI = [scale[5], scale[0], scale[2]];
  77. VII = [scale[6], scale[1], scale[3]];
  78. }
  79.  
  80. function init(){
  81. updateScales();
  82. for(let i=0; i<numbars; i++){
  83. let valid = false;
  84. while(!valid){
  85. let p = 1+Math.floor(Math.random()*7);
  86. if(allowedchords.includes(p)){
  87. if(i > 0 && progression[i-1] == p){
  88. valid = false;
  89. }
  90. else{
  91. valid = true;
  92. }
  93. if(valid){
  94. if(p == 1){
  95. progression.push(1);
  96. }
  97. else if(p == 2){
  98. progression.push(2);
  99. }
  100. else if(p == 3){
  101. progression.push(3);
  102. }
  103. else if(p == 4){
  104. progression.push(4);
  105. }
  106. else if(p == 5){
  107. progression.push(5);
  108. }
  109. else if(p == 6){
  110. progression.push(6);
  111. }
  112. else if(p == 7){
  113. progression.push(7);
  114. }
  115. }
  116. }
  117. }
  118. }
  119.  
  120. keychanges = [[key, 0]]
  121. let nk = 4;
  122. for(let i=0; i<nk-1; i++){
  123. let k = onlymajor?keys_major[Math.floor(Math.random()*keys_major.length)]:onlyminor?keys_minor[Math.floor(Math.random()*keys_minor.length)]:keys[Math.floor(Math.random()*keys.length)];
  124. keychanges.push([k, (i+1)*numbars/nk]);
  125. }
  126.  
  127. generate();
  128.  
  129. }
  130.  
  131. function intToChord(i){
  132. if(i == 1) return I;
  133. if(i == 2) return II;
  134. if(i == 3) return III;
  135. if(i == 4) return IV;
  136. if(i == 5) return V;
  137. if(i == 6) return VI;
  138. if(i == 7) return VII;
  139. }
  140.  
  141. function generate(){
  142. let fs = require('fs');
  143. let Midi = require('jsmidgen');
  144.  
  145. let file = new Midi.File();
  146.  
  147.  
  148. let tracks = [];
  149. /*
  150. let track = new Midi.Track();
  151. let track2 = new Midi.Track();
  152. */
  153.  
  154. tracks.push(new Midi.Track());
  155. tracks.push(new Midi.Track());
  156. //tracks.push(new Midi.Track());
  157.  
  158. for(let i=0; i<tracks.length; i++){
  159. file.addTrack(tracks[i]);
  160. }
  161.  
  162. tracks[0].instrument(0, 0);
  163. tracks[1].instrument(1, 0);
  164. //tracks[1].instrument(1, 1);
  165.  
  166. for(let t=0; t<tracks.length; t++){
  167. let currenttime = 0;
  168.  
  169. if(t < tracks.length-1){
  170. let lastlength = 0;
  171. let lastn = -1;
  172. let lastbar = -1;
  173. while(currenttime < maxlength-1){
  174. let bar = Math.floor(currenttime/barlength);
  175. console.log(bar);
  176. let slowdown = false;
  177. for (let k=0; k<keychanges.length; k++){
  178. if(keychanges[k][1] == bar){
  179. key = keychanges[k][0];
  180. updateScales();
  181. console.log("KEY CHANGE");
  182. }
  183. else if(keychanges[k][1] == bar+1){
  184. slowdown = true;
  185. }
  186. }
  187. slowdown = false;
  188. let n = Math.floor(Math.random()*3);
  189. if(Math.random() > 0.3){
  190. n = (lastn+Math.pow(-1,Math.floor(Math.random()*2)));
  191. n = n%3;
  192. n = Math.abs(n);
  193. }
  194. let rawnote = intToChord(progression[bar])[n];
  195. let note = rawnote+(Math.random()<0.5?"4":"4");
  196. let length;
  197. let allowpassing = false;
  198. let passed = false;
  199. if(slowdown){
  200. length = barlength/2;
  201. }
  202. else if(lastlength == 0){
  203. let r = Math.floor(Math.random()*1);
  204. if(r == 0) length = 128;
  205. else if(r == 1) length = 128;
  206. else if(r == 2) length = 64;
  207.  
  208. lastlength = length;
  209. }
  210. else{
  211. length = lastlength; //Avoid notes crossing bars
  212. lastlength = 0;
  213. }
  214.  
  215. if(currenttime%barlength + length > barlength){
  216. length = barlength;
  217. }
  218.  
  219. if(length <= barlength/4){
  220. allowpassing = true;
  221. }
  222.  
  223. allowpassing = true;
  224.  
  225. if(allowpassing && Math.random() < 0.25){
  226. let ni = scalePositionOf(rawnote);
  227. //console.log(ni);
  228. if(ni != null){
  229. if(ni < 7) note = scale[ni+1]+"4";
  230. else note = scale[ni-1]+"4";
  231. passed = true;
  232. }
  233. }
  234. /*
  235. if(currenttime%barlength + length > barlength){
  236. length = barlength-currenttime%barlength;
  237. }
  238. */
  239.  
  240. console.log(key + " - " + note + " - " + n + " - " + passed);
  241. if(Math.random() < 0.1){
  242. tracks[t].addNoteOff(t, "", length);
  243. }
  244. else{
  245. tracks[t].addNoteOn(t, note, 0, 90-30*t);
  246. tracks[t].addNoteOff(t, note, length, 90-30*t);
  247. }
  248. currenttime += length;
  249. }
  250. }
  251. else{
  252. while(currenttime < maxlength){
  253. let bar = Math.floor(currenttime/barlength);
  254. for (let k=0; k<keychanges.length; k++){
  255. if(keychanges[k][1] == bar){
  256. key = keychanges[k][0];
  257. updateScales();
  258. }
  259. }
  260. if(blockchords){
  261. let s = 1+4+Math.floor(Math.random()*(7-4));
  262. //s = 6;
  263. if(s === 1) tracks[t].addChord(t,[intToChord(progression[bar])[2]+(Math.random()<0.5?"3":"4")],barlength, 80);
  264. if(s === 2) tracks[t].addChord(t,[intToChord(progression[bar])[1]+(Math.random()<0.5?"3":"4")],barlength, 80);
  265. if(s === 3) tracks[t].addChord(t,[intToChord(progression[bar])[1]+(Math.random()<0.5?"3":"4"),intToChord(progression[bar])[2]+(Math.random()<0.5?"3":"4")],barlength, 80);
  266. if(s === 4) tracks[t].addChord(t,[intToChord(progression[bar])[0]+(Math.random()<0.5?"3":"4")],barlength, 80);
  267. if(s === 5) tracks[t].addChord(t,[intToChord(progression[bar])[0]+(Math.random()<0.5?"3":"4"),intToChord(progression[bar])[2]+(Math.random()<0.5?"3":"4")],barlength, 80);
  268. if(s === 6) tracks[t].addChord(t,[intToChord(progression[bar])[0]+(Math.random()<0.5?"3":"4"),intToChord(progression[bar])[1]+(Math.random()<0.5?"3":"4")],barlength, 80);
  269. if(s === 7) tracks[t].addChord(t,[intToChord(progression[bar])[0]+(Math.random()<0.5?"3":"4"),intToChord(progression[bar])[1]+(Math.random()<0.5?"3":"4"),intToChord(progression[bar])[2]+(Math.random()<0.5?"3":"4")],barlength, 80);
  270. }
  271. else{
  272. tracks[t].addNoteOn(t, intToChord(progression[bar])[0]+"4", 0);
  273. tracks[t].addNoteOff(t, intToChord(progression[bar])[0]+"4", barlength/4);
  274. tracks[t].addNoteOn(t, intToChord(progression[bar])[1]+"4", 0);
  275. tracks[t].addNoteOff(t, intToChord(progression[bar])[1]+"4", barlength/4);
  276. tracks[t].addNoteOn(t, intToChord(progression[bar])[2]+"4", 0);
  277. tracks[t].addNoteOff(t, intToChord(progression[bar])[2]+"4", barlength/4);
  278. }
  279.  
  280. currenttime += barlength;
  281. }
  282. }
  283. }
  284.  
  285. console.log(keychanges);
  286. //console.log(progression);
  287. fs.writeFileSync('output.mid', file.toBytes(), 'binary');
  288. }
  289.  
  290.  
  291. function scalePositionOf(note){
  292. //console.log(note);
  293. //console.log(scale);
  294. for(let i=0; i<scale.length; i++){
  295. if(scale[i] == note) return i;
  296. }
  297. return null;
  298. }
Advertisement
Add Comment
Please, Sign In to add comment
Advertisement
Public Pastes
Advertisement
We use cookies for various purposes including analytics. By continuing to use Pastebin, you agree to our use of cookies as described in the Cookies Policy.  OK, I Understand
Not a member of Pastebin yet?
Sign Up, it unlocks many cool features!