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IMP: waveform perf improvement

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This commit is contained in:
Julien Maille 2026-01-09 22:11:30 +01:00
parent c44b30b55b
commit 62e0906b3a
1 changed files with 7 additions and 4 deletions
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11
js/waveform.js
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@ -27,16 +27,19 @@ export class WaveformGenerator {
} }
extractPeaks(audioBuffer) { extractPeaks(audioBuffer) {
const { numberOfChannels, length, sampleRate } = audioBuffer; const { length, duration } = audioBuffer;
const numPeaks = Math.floor(4*length/sampleRate); const numPeaks = Math.min(Math.floor(4*duration), 1000);
const peaks = new Float32Array(numPeaks); const peaks = new Float32Array(numPeaks);
const chanData = audioBuffer.getChannelData(0); // Use first channel const chanData = audioBuffer.getChannelData(0); // Use first channel
const step = Math.floor(length / numPeaks); const step = Math.floor(length / numPeaks);
const stride = 8; // Check every 8th sample for speed
for (let i = 0; i < numPeaks; i++) { for (let i = 0; i < numPeaks; i++) {
let max = 0; let max = 0;
for (let j = 0; j < step; j++) { const start = i * step;
const datum = chanData[i * step + j]; const end = start + step;
for (let j = start; j < end; j += stride) {
const datum = chanData[j];
if (datum > max) { if (datum > max) {
max = datum; max = datum;
} else if (-datum > max) { } else if (-datum > max) {