@omnimedia/omnitool
Version:
open source video processing tools
25 lines • 930 B
JavaScript
export async function prepAudio(driver, source) {
const arrayBuffer = await source.arrayBuffer();
const audioCTX = new AudioContext({ sampleRate: 16000 });
try {
const audioData = await audioCTX.decodeAudioData(arrayBuffer);
let audio;
if (audioData.numberOfChannels === 2) {
const SCALING_FACTOR = Math.sqrt(2);
const left = audioData.getChannelData(0);
const right = audioData.getChannelData(1);
audio = new Float32Array(left.length);
for (let i = 0; i < audioData.length; ++i)
audio[i] = (SCALING_FACTOR * (left[i] + right[i])) / 2;
}
else {
audio = audioData.getChannelData(0);
}
const duration = await driver.getAudioDuration(source);
return { audio, duration };
}
finally {
await audioCTX.close();
}
}
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