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This commit is contained in:
Miika Alonen
2023-08-29 16:08:11 +03:00
parent 9e993e8579
commit 6b7517ea4d
7 changed files with 105 additions and 64 deletions
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67
src/TransportNode.js
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@ -10,9 +10,7 @@ export class TransportNode extends AudioWorkletNode {
this.port.start();
/** @type {HTMLSpanElement} */
this.$clock = document.getElementById("clockviewer");
this.hasBeenEvaluated = false;
this.currentPulsePosition = 0;
this.nextPulsePosition = -1;
this.executionLatency = 0;
this.lastLatencies = [
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
@ -21,29 +19,29 @@ export class TransportNode extends AudioWorkletNode {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
];
this.indexOfLastLatencies = 0;
this.logicalTime = 0;
}
/** @type {(this: MessagePort, ev: MessageEvent<any>) => any} */
handleMessage = (message) => {
if (message.data && message.data.type === "bang") {
let { futureTimeStamp, timeToNextPulse, nextPulsePosition } = this.convertTimeToNextBarsBeats(message.data.logicalTime);
// Evaluate the global buffer only once per ppqn value
if (this.nextPulsePosition !== nextPulsePosition) {
this.nextPulsePosition = nextPulsePosition;
setTimeout(() => {
const now = this.app.audioContext.currentTime;
this.app.clock.time_position = futureTimeStamp;
tryEvaluate(this.app, this.app.global_buffer);
this.hasBeenEvaluated = true;
this.currentPulsePosition = nextPulsePosition;
const then = this.app.audioContext.currentTime;
this.lastLatencies[this.indexOfLastLatencies] = then - now;
this.indexOfLastLatencies = (this.indexOfLastLatencies + 1) % this.lastLatencies.length;
const averageLatency = this.lastLatencies.reduce((a, b) => a + b) / this.lastLatencies.length;
this.executionLatency = averageLatency / 1000;
}, (timeToNextPulse + this.executionLatency) * 1000);
}
this.logicalTime = message.data.logicalTime;
this.app.clock.tick++
let futureTimeStamp = this.convertTicksToTimeposition(this.app.clock.tick);
console.log("BANG", this.logicalTime, futureTimeStamp);
setTimeout(() => {
console.log("EVALUATING");
const now = this.app.audioContext.currentTime;
this.app.clock.time_position = futureTimeStamp;
tryEvaluate(this.app, this.app.global_buffer);
const then = this.app.audioContext.currentTime;
this.lastLatencies[this.indexOfLastLatencies] = then - now;
this.indexOfLastLatencies = (this.indexOfLastLatencies + 1) % this.lastLatencies.length;
const averageLatency = this.lastLatencies.reduce((a, b) => a + b) / this.lastLatencies.length;
this.executionLatency = averageLatency / 1000;
}, (this.app.clock.pulse_duration + this.executionLatency) * 1000);
}
};
@ -55,6 +53,14 @@ export class TransportNode extends AudioWorkletNode {
this.port.postMessage("pause");
}
setBPM(bpm) {
this.port.postMessage({ type: "bpm", value: bpm });
}
setPPQN(ppqn) {
this.port.postMessage({ type: "ppqn", value: ppqn });
}
stop() {
this.app.clock.tick = 0;
// this.$clock.innerHTML = `[${1} | ${1} | ${zeroPad(1, '2')}]`;
@ -86,17 +92,16 @@ export class TransportNode extends AudioWorkletNode {
const futureBeatNumber = this.nextPulsePosition / this.app.clock.ppqn;
const futureBarNumber = futureBeatNumber / beatsPerBar;
const futureTimeStamp = {
bar: Math.floor(futureBarNumber) + 1,
beat: Math.floor(futureBeatNumber) % beatsPerBar + 1,
pulse: Math.floor(this.nextPulsePosition) % this.app.clock.ppqn
};
this.app.clock.tick++
return {
futureTimeStamp,
timeToNextPulse,
nextPulsePosition
};
}
convertTicksToTimeposition(ticks) {
const beatsPerBar = this.app.clock.time_signature[0];
const ppqnPosition = (ticks % this.app.clock.ppqn)+1;
const beatNumber = Math.floor(ticks / this.app.clock.ppqn);
const barNumber = Math.floor(beatNumber / beatsPerBar)+1;
const beatWithinBar = Math.floor(beatNumber % beatsPerBar)+1;
return {bar: barNumber, beat: beatWithinBar, ppqn: ppqnPosition};
}
}