Created
December 19, 2017 19:37
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Tone.js timing inaccuracy
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| import Tone from 'tone' | |
| const bpm = 120.0 | |
| const QUARTER_NOTE_MS = 60000.0 / bpm | |
| var lastTime | |
| Tone.Transport.bpm.value = bpm; | |
| // Measure time delta since last call, warn if early or late | |
| function measureInterval(time) { | |
| var currentTime = Date.now() | |
| if (lastTime !== undefined) { | |
| const deltaTime = currentTime - lastTime | |
| const errorTime = deltaTime - QUARTER_NOTE_MS | |
| if (errorTime > 0.0) { | |
| console.warn("Transport fired", errorTime, "ms LATE"); | |
| } else if (errorTime < 0.0) { | |
| console.warn("Transport fired", -errorTime, "ms EARLY"); | |
| } | |
| } | |
| lastTime = currentTime | |
| } | |
| // NOTE: timing is frequently off by >20ms | |
| // e.g. | |
| // Transport fired 25 ms LATE | |
| // Transport fired 9 ms EARLY | |
| // Transport fired 6 ms EARLY | |
| // Transport fired 22 ms LATE | |
| // Transport fired 7 ms EARLY | |
| // Transport fired 9 ms EARLY | |
| // Transport fired 18 ms LATE | |
| Tone.Transport.scheduleRepeat(measureInterval, "4n") | |
| // // COMPARE WITH setInterval: timing is never off by >1ms | |
| // setInterval(measureInterval, QUARTER_NOTE_MS) | |
| Tone.Transport.start() |
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