105 lines
2.7 KiB
HTML
105 lines
2.7 KiB
HTML
<!doctype html>
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<html>
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<head>
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</head>
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<body>
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<script>
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var Module = {
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onRuntimeInitialized: function() {
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}
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};
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</script>
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<script src="wrapper.js"></script>
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<input type="file" id="file" name="file" />
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<script>
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var minPortion = 20480;
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var maxPortion = 40960;
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var time = 0;
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var ctx = new AudioContext();
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ctx.suspend();
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var decoder;
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var fragments = [];
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var noize = [];
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var decoding = false;
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function onChange(e) {
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var file = e.target.files[0];
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var reader = new FileReader();
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reader.onload = function(e) {
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decoder = new Module.Decoder();
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createFileFragments(reader.result);
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scheduleData();
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setTimeout(ctx.resume.bind(ctx), 1000);
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}
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reader.readAsArrayBuffer(file);
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}
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function schedule() {
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decoding = false;
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if (decoder.hasMore()) {
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var audio = decoder.decode(20);
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if (audio) {
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var source = ctx.createBufferSource();
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source.buffer = audio;
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source.connect(ctx.destination);
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source.start(time);
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time += audio.duration;
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setTimeout(schedule, Math.floor(audio.duration * 200));
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decoding = true;
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} else {
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//decoder.delete();
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}
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} else {
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//decoder.delete();
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}
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}
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function scheduleData() {
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if (fragments.length) {
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var frag = fragments.shift();
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decoder.addFragment(frag.ptr, frag.length);
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if (fragments.length) {
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setTimeout(scheduleData, 50);
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}
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if (!decoding) {
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schedule();
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}
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}
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}
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function createFileFragments(buffer) {
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var src = new Uint8Array(buffer);
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var shoved = 0;
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while (shoved !== src.length) {
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var ps = Math.min(Math.floor(Math.random() * (maxPortion - minPortion) + minPortion), src.length - shoved);
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var ptr = Module._malloc(ps);
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var arr = new Uint8Array(Module.HEAPU8.buffer, ptr, ps);
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var portion = new Uint8Array(buffer, shoved, ps)
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arr.set(portion, 0);
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shoved += ps;
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fragments.push({
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ptr: ptr,
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length: ps
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});
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noize.push(Module._malloc(256));
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}
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}
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document.getElementById("file").addEventListener("change", onChange, false);
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</script>
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</body>
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</html>
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