Sampler Synth Test
import {AudioOut} from "@maddievision/audio-out"
import {Synth} from '@maddievision/sampler-synth'
import {soundBank} from '@maddievision/bitbin-sound-bank'
import {MIDIPlayer} from '@maddievision/midiplayer'
audioOut = { let t = 0 const audioOut = new AudioOut( 8192, e => {}, (b1, b2) => { for (let i = 0; i < 8192; i++) { player.advance(); synth.play(); b1[i] = synth.outL; b2[i] = synth.outR; t++ } } ); invalidation.then(() => { audioOut.disconnect() }) yield audioOut }
sampleRate = 44100
synth = { const s = new Synth(sampleRate,32,soundBank); invalidation.then(() => { s.kill_all_voices(); s.reset_all_channels(); }) yield s }
player = { if (synth) { const mp = new MIDIPlayer(sampleRate, ev => { synth.midi_event(ev); }); invalidation.then(() => { mp.stop() }) yield mp } }
genControlLerp = (ts, cid, channel, cc, v1, v2, duration) => { let t = 0; let v = v1; let lastV = -1; let step = (v2 - v1) / duration; let events = []; while (t < duration) { let intV = Math.round(v); if (lastV == -1 || lastV != intV) { lastV = intV; events.push([ts + t, cid++, [0xb0 + channel, cc, intV]]) } v += step; t++; } if (lastV == -1 || lastV != v2) { events.push([ts + duration - 1, cid++, [0xb0 + channel, cc, v2]]) } return events; }
genNote = (ts, cid, channel, note, v1, v2, duration) => { let events = []; events.push([ts, cid++, [0x90 + channel, note, v1]]); events.push([ts + duration, cid++, [0x80 + channel, note, v2]]); return events; }
ppqn = 96;
tempo = 90
tempoToMs = tempo => Math.floor(60000000 / tempo);
mspt = tempoToMs(90)
pattern = [55, 57, 55, 62, 55, 57, 55, 64, 55, 57, 55, 62, 55, 57, 55];
{ if (audioOut && synth && player) { let ts = 0 let cid = 0 let events = [ [ ts, cid++, [ 0xff,0x51,0x03, Math.floor(mspt / 0x10000), Math.floor(mspt / 0x100) % 0x100, mspt % 0x100 ] ] ] let addPatch = (ch, program) => { events.push([ts, cid++, [0xc0 + ch, program]]); } let addControl = (ch, cc, v) => { events.push([ts, cid++, [0xb0 + ch, cc, v]]); } let addControlLerp = (ch, cc, v1, v2, duration) => { let lerpEvents = genControlLerp(ts, cid, ch, cc, v1, v2, duration); cid += lerpEvents.length; events = events.concat(lerpEvents); } let addNote = (ch, note, v1, v2, duration) => { let noteEvents = genNote(ts, cid, ch, note, v1, v2, duration); cid += noteEvents.length; events = events.concat(noteEvents); } let wait = duration => { ts += duration; } let doCycle = (ch, note, nd, vd) => { addControlLerp(ch, 11, 127, 0, vd); addNote(ch, note, 0x70, 0, nd); wait(ppqn / 4); } addPatch(0, 2); // change patch addPatch(1, 0); // change patch addPatch(2, 1); // change patch addControl(0, 7, 127); // set vol addControl(1, 7, 127); // set vol addControl(2, 7, 127); // set vol let mainPattern = () => { pattern.forEach(n => { doCycle(0, n, ppqn / 4, ppqn /8); }); }; let mainPattern2 = () => { pattern.forEach(n => { doCycle(1, n - 12, ppqn * 3, ppqn * 3); mainPattern(); }); }; let mainPattern3 = () => { pattern.forEach(n => { doCycle(2, n - 24, ppqn * 3, ppqn * 3); mainPattern2(); }); }; mainPattern3(); synth.reset(); player.playMIDI([events], ppqn); // play it! invalidation.then(() => { synth.kill_all_voices(); synth.reset_all_channels(); player.stop(); }) yield events } }