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<meta charset="utf-8">
<head>
<title>Test MediaElementAudioSourceNode</title>
<script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
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<pre id="test">
<script class="testbody" type="text/javascript">
SimpleTest.waitForExplicitFinish();
function test() {
var audio = new Audio("small-shot.ogg");
var context = new AudioContext();
var expectedMinNonzeroSampleCount;
var expectedMaxNonzeroSampleCount;
var nonzeroSampleCount = 0;
var complete = false;
var iterationCount = 0;
// This test ensures we receive at least expectedSampleCount nonzero samples
function processSamples(e) {
if (complete) {
return;
}
if (iterationCount == 0) {
// Don't start playing the audio until the AudioContext stuff is connected
// and running.
audio.play();
}
++iterationCount;
var buf = e.inputBuffer.getChannelData(0);
var nonzeroSamplesThisBuffer = 0;
for (var i = 0; i < buf.length; ++i) {
if (buf[i] != 0) {
++nonzeroSamplesThisBuffer;
}
}
nonzeroSampleCount += nonzeroSamplesThisBuffer;
is(e.inputBuffer.numberOfChannels, 1,
"Checking data channel count (nonzeroSamplesThisBuffer=" +
nonzeroSamplesThisBuffer + ")");
ok(nonzeroSampleCount <= expectedMaxNonzeroSampleCount,
"Too many nonzero samples (got " + nonzeroSampleCount + ", expected max " + expectedMaxNonzeroSampleCount + ")");
if (nonzeroSampleCount >= expectedMinNonzeroSampleCount &&
nonzeroSamplesThisBuffer == 0) {
ok(true,
"Check received enough nonzero samples (got " + nonzeroSampleCount + ", expected min " + expectedMinNonzeroSampleCount + ")");
SimpleTest.finish();
complete = true;
}
}
audio.onloadedmetadata = function() {
var node = context.createMediaElementSource(audio);
var sp = context.createScriptProcessor(2048, 1);
node.connect(sp);
// Use a fuzz factor of 100 to account for samples that just happen to be zero
expectedMinNonzeroSampleCount = Math.floor(audio.duration*context.sampleRate) - 100;
expectedMaxNonzeroSampleCount = Math.floor(audio.duration*context.sampleRate) + 500;
sp.onaudioprocess = processSamples;
};
}
SpecialPowers.pushPrefEnv({"set": [["media.preload.default", 2], ["media.preload.auto", 3]]}, test);
</script>
</pre>
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