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<!doctype html>
<meta charset="utf-8">
<title>Test for AudioBuffer's "acquire the content" operation</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
const SAMPLERATE = 8000;
const LENGTH = 128;
var tests = {
"AudioBufferSourceNode setter set with non-null buffer": function(oac) {
var buf = oac.createBuffer(1, LENGTH, SAMPLERATE)
var bs = new AudioBufferSourceNode(oac);
var channelData = buf.getChannelData(0);
for (var i = 0; i < channelData.length; i++) {
channelData[i] = 1.0;
}
bs.buffer = buf;
bs.start(); // This acquires the content since buf is not null
for (var i = 0; i < channelData.length; i++) {
channelData[i] = 0.5;
}
allSamplesAtOne(buf, "reading back");
bs.connect(oac.destination);
return oac.startRendering();
},
"AudioBufferSourceNode buffer setter set with null" : (oac) => {
var buf = oac.createBuffer(1, LENGTH, SAMPLERATE)
var bs = new AudioBufferSourceNode(oac);
var channelData = buf.getChannelData(0);
for (var i = 0; i < channelData.length; i++) {
channelData[i] = 1.0;
}
bs.buffer = null;
bs.start(); // This does not acquire the content
bs.buffer = buf; // This does
for (var i = 0; i < channelData.length; i++) {
channelData[i] = 0.5;
}
allSamplesAtOne(buf, "reading back");
bs.connect(oac.destination);
return oac.startRendering();
},
"ConvolverNode": (oac) => {
var buf = oac.createBuffer(1, LENGTH, SAMPLERATE)
var impulse = oac.createBuffer(1, 1, SAMPLERATE)
var bs = new AudioBufferSourceNode(oac);
var convolver = new ConvolverNode(oac, {disableNormalization: true});
impulse.getChannelData(0)[0] = 1.0; // unit impulse function
convolver.buffer = impulse; // This does acquire the content
impulse.getChannelData(0)[0] = 0.5;
var channelData = buf.getChannelData(0);
for (var i = 0; i < channelData.length; i++) {
channelData[i] = 1.0;
}
bs.buffer = buf;
bs.start();
bs.connect(convolver).connect(oac.destination);
return oac.startRendering();
}
};
function allSamplesAtOne(audiobuffer, location) {
var buf = audiobuffer.getChannelData(0);
for (var i = 0; i < buf.length; i++) {
// The convolver can introduce a slight numerical error.
if (Math.abs(buf[i] - 1.0) > 0.0001) {
assert_true(false, `Invalid value at index ${i}, expecte close to 1.0, found ${buf[i]} when ${location}`)
return Promise.reject();
}
}
assert_true(true, `Buffer unmodified when ${location}.`);
return Promise.resolve();
}
for (const test of Object.keys(tests)) {
promise_test(async function(t) {
var buf = await tests[test](new OfflineAudioContext(1, LENGTH, SAMPLERATE));
return allSamplesAtOne(buf, "rendering");
}, test);
};
</script>
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