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Test Info:
- Manifest: dom/media/test/mochitest_compat.toml
<!DOCTYPE HTML>
<html>
<head>
<title>Media test: disable phase inversion in opus decoder</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body>
<audio preload=none id="a" controls></audio>
<audio preload=none id="b" controls></audio>
<script class="testbody" type="text/javascript">
/*
This test makes use of an (stereo) opus file with phase inversion of 180 degrees (right = -left => right + left = 0).
Firstly, the phase inversion is verified on a normal stereo playback.
Secondly, mono playback is forced which results in the phase inversion being disabled (Bug 1431810).
*/
SimpleTest.waitForExplicitFinish();
/* global a, b */
function areChannelsInverted(b1, b2) {
for (var i = 0; i < b1.length; i++) {
if (Math.abs(b1[i] + b2[i]) > 9e-2) {
return false;
}
}
return true;
}
function areChannelsEqual(b1, b2) {
for (var i = 0; i < b1.length; i++) {
if (Math.abs(b1[i] - b2[i]) > 9e-3) {
return false;
}
}
return true;
}
function isSilent(b) {
for (var i = 0; i < b.length; i++) {
if (b[i] != 0.0) {
return false;
}
}
return true;
}
function mediaElementWithPhaseInversion(audioContext, mediaElement, success) {
let audio_source = audioContext.createMediaElementSource(mediaElement);
let script_processor = audioContext.createScriptProcessor();
audio_source.connect(script_processor);
mediaElement.onplay = () => {
script_processor.onaudioprocess = (e) => {
let right = e.inputBuffer.getChannelData(0);
let left = e.inputBuffer.getChannelData(1);
// This is leading or trailing silence
// produced by ScriptProcessor.
if (isSilent(right) && isSilent(left)) {
return;
}
ok(areChannelsInverted(right, left), "Channels must be inverted");
}
}
mediaElement.onended = () => {
ok(true, "End of file.");
mediaElement.onended = null;
script_processor.onaudioprocess = null;
success();
}
mediaElement.src = "test-stereo-phase-inversion-180.opus";
// Normal playback channels will by inverted
mediaElement.play();
}
function mediaElementWithPhaseInversionDisabled(audioContext, mediaElement, success) {
let audio_source = audioContext.createMediaElementSource(mediaElement);
let script_processor = audioContext.createScriptProcessor();
audio_source.connect(script_processor);
mediaElement.onplay = () => {
script_processor.onaudioprocess = (e) => {
let right = e.inputBuffer.getChannelData(0);
let left = e.inputBuffer.getChannelData(1);
// This is leading or trailing silence
// produced by ScriptProcessor.
if (isSilent(right) && isSilent(left)) {
return;
}
ok(!areChannelsInverted(right, left), "Channels must not be inverted");
ok(areChannelsEqual(right, left), "Channels must be equal");
}
}
mediaElement.onended = () => {
ok(true, "End of file.");
mediaElement.onended = null;
script_processor.onaudioprocess = null;
success();
}
mediaElement.src = "test-stereo-phase-inversion-180.opus";
// Downmix to mono will force to disable opus phase inversion
SpecialPowers.pushPrefEnv({"set": [["accessibility.monoaudio.enable", true]]})
.then(() => {
mediaElement.play();
});
}
let ac = new AudioContext();
function testPhaseInversion() {
return new Promise((accept) => {
mediaElementWithPhaseInversion(ac, a, accept);
});
}
function testPhaseInversionDisabled() {
return new Promise((accept) => {
mediaElementWithPhaseInversionDisabled(ac, b, accept);
});
}
// Start testing
testPhaseInversion(a)
.then( () => testPhaseInversionDisabled(b) )
.then( () => SimpleTest.finish() )
</script>
</pre>
</body>
</html>