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Decode audio files with AudioContext

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wave-glsl 2020-08-14 18:40:55 -07:00 committed by GitHub
parent a4f975b5e5
commit 4f005e86c2
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1 changed files with 64 additions and 35 deletions
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33
js/ngfile.js
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@ -128,8 +128,8 @@ app.controller('mainController', function ($scope, $http, wave) {
}
reader.onload = function (e) {
var x = reader.result.split(/[\s,;\t\r\n]+/);
function parseTextData(inputText) {
var x = inputText.split(/[\s,;\t\r\n]+/);
var j = 0;
@ -158,15 +158,44 @@ app.controller('mainController', function ($scope, $http, wave) {
wave.sigData.splice(j, rm);
}
*/
}
async function parseAudioData(inputBuffer) {
console.log("Converting a", inputBuffer.byteLength,
"bytes audio buffer to linear PCM");
var audioCtx = new AudioContext({ sampleRate: 44100 });
var pcmData = await audioCtx.decodeAudioData(inputBuffer);
var pcmSamples = pcmData.getChannelData(0); // Float32Array
wave.sigData = new Float64Array(pcmSamples);
wave.sigLength = pcmSamples.length;
}
reader.onload = async function (e) {
var input = reader.result;
if (input instanceof ArrayBuffer)
await parseAudioData(input);
else
parseTextData(input);
console.log("Input wave:", wave.sigLength, "samples");
if (wave.transform == 1) {
location.href = '#/display';
} else if (wave.transform == 2) {
location.href = '#/cdisplay';
} else if (wave.transform == 4) {
location.href = '#/denoise';
} else {
location.href = '#/cdisplay';
}
}
if (finp1.type == "audio/mpeg")
reader.readAsArrayBuffer(finp1);
else
reader.readAsText(finp1);
}