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104 lines
3.9 KiB
HTML
104 lines
3.9 KiB
HTML
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<!DOCTYPE HTML>
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<html>
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<head>
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<title>Test ScriptProcessorNode with passthrough</title>
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<script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
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<script type="text/javascript" src="webaudio.js"></script>
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<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
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</head>
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<body>
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<pre id="test">
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<script class="testbody" type="text/javascript">
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// We do not use our generic graph test framework here because
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// the testing logic here is sort of complicated, and would
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// not be easy to map to OfflineAudioContext, as ScriptProcessorNodes
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// can experience delays.
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SimpleTest.waitForExplicitFinish();
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addLoadEvent(function() {
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var context = new AudioContext();
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var buffer = null;
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var sourceSP = context.createScriptProcessor(2048);
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sourceSP.addEventListener("audioprocess", function(e) {
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// generate the audio
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for (var i = 0; i < 2048; ++i) {
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// Make sure our first sample won't be zero
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e.outputBuffer.getChannelData(0)[i] = Math.sin(440 * 2 * Math.PI * (i + 1) / context.sampleRate);
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e.outputBuffer.getChannelData(1)[i] = Math.sin(880 * 2 * Math.PI * (i + 1) / context.sampleRate);
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}
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// Remember our generated audio
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buffer = e.outputBuffer;
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sourceSP.removeEventListener("audioprocess", arguments.callee);
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}, false);
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function findFirstNonZeroSample(buffer) {
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for (var i = 0; i < buffer.length; ++i) {
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if (buffer.getChannelData(0)[i] != 0) {
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return i;
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}
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}
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return buffer.length;
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}
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var sp = context.createScriptProcessor(2048);
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sourceSP.connect(sp);
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var spWrapped = SpecialPowers.wrap(sp);
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ok("passThrough" in spWrapped, "ScriptProcessorNode should support the passThrough API");
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spWrapped.passThrough = true;
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sp.onaudioprocess = function() {
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ok(false, "The audioprocess event must never be dispatched on the passthrough ScriptProcessorNode");
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};
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var sp2 = context.createScriptProcessor(2048);
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sp.connect(sp2);
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sp2.connect(context.destination);
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var emptyBuffer = context.createBuffer(1, 2048, context.sampleRate);
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sp2.onaudioprocess = function(e) {
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// Because of the initial latency added by the second script processor node,
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// we will never see any generated audio frames in the first callback.
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compareChannels(e.inputBuffer.getChannelData(0), emptyBuffer.getChannelData(0));
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compareChannels(e.inputBuffer.getChannelData(1), emptyBuffer.getChannelData(0));
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sp2.onaudioprocess = function(e) {
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var firstNonZero = findFirstNonZeroSample(e.inputBuffer);
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ok(firstNonZero <= 2048, "First non-zero sample within range");
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compareChannels(e.inputBuffer.getChannelData(0), emptyBuffer.getChannelData(0), firstNonZero);
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compareChannels(e.inputBuffer.getChannelData(1), emptyBuffer.getChannelData(0), firstNonZero);
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compareChannels(e.inputBuffer.getChannelData(0), buffer.getChannelData(0), 2048 - firstNonZero, firstNonZero, 0);
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compareChannels(e.inputBuffer.getChannelData(1), buffer.getChannelData(1), 2048 - firstNonZero, firstNonZero, 0);
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if (firstNonZero == 0) {
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// If we did not experience any delays, the test is done!
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sp2.onaudioprocess = null;
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SimpleTest.finish();
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} else if (firstNonZero != 2048) {
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// In case we just saw a zero buffer this time, wait one more round
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sp2.onaudioprocess = function(e) {
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compareChannels(e.inputBuffer.getChannelData(0), buffer.getChannelData(0), firstNonZero, 0, 2048 - firstNonZero);
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compareChannels(e.inputBuffer.getChannelData(1), buffer.getChannelData(1), firstNonZero, 0, 2048 - firstNonZero);
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compareChannels(e.inputBuffer.getChannelData(0), emptyBuffer.getChannelData(0), undefined, firstNonZero);
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compareChannels(e.inputBuffer.getChannelData(1), emptyBuffer.getChannelData(0), undefined, firstNonZero);
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sp2.onaudioprocess = null;
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SimpleTest.finish();
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};
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}
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};
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};
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});
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</script>
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</pre>
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</body>
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</html>
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