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139 lines
3.7 KiB
HTML
139 lines
3.7 KiB
HTML
<!DOCTYPE HTML>
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<html>
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<head>
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<title>Test tail time lifetime of DelayNode after input finishes and new input added</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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SimpleTest.waitForExplicitFinish();
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// The buffer source will start on a block boundary, so keeping the signal
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// within one block ensures that it will not cross AudioProcessingEvent buffer
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// boundaries.
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const signalLength = 128;
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const bufferSize = 1024;
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// Delay should be long enough to allow CC to run
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var delayBufferCount = 50;
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var delayBufferOffset;
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const delayLength = delayBufferCount * bufferSize;
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var phase = "initial";
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var sourceCount = 0;
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var delayCount = 0;
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var oscillator;
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var delay;
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var source;
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function applySignal(buffer, offset) {
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for (var i = 0; i < signalLength; ++i) {
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buffer.getChannelData(0)[offset + i] = Math.cos(Math.PI * i / signalLength);
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}
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}
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function bufferIsSilent(buffer, out) {
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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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if (out) {
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out.soundOffset = i;
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}
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return false;
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}
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}
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return true;
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}
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function onDelayOutput(e) {
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switch(phase) {
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case "initial":
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// Wait for oscillator sound to exit delay
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if (bufferIsSilent(e.inputBuffer))
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break;
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phase = "played oscillator";
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break;
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case "played oscillator":
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// First tail time has expired. Start second source and remove references
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// to the delay and connected second source.
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oscillator.disconnect();
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source.connect(delay);
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source.start();
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source = null;
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delay = null;
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phase = "started second source";
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break;
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case "second tail time":
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if (delayCount == delayBufferCount) {
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var ctx = e.target.context;
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var expected = ctx.createBuffer(1, bufferSize, ctx.sampleRate);
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applySignal(expected, delayBufferOffset);
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compareBuffers(e.inputBuffer, expected);
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e.target.onaudioprocess = null;
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SimpleTest.finish();
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}
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}
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delayCount++;
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}
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function onSourceOutput(e) {
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switch(phase) {
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case "started second source":
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var out = {};
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if (!bufferIsSilent(e.inputBuffer, out)) {
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delayBufferCount += sourceCount;
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delayBufferOffset = out.soundOffset;
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phase = "played second source";
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}
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break;
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case "played second source":
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SpecialPowers.forceGC();
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SpecialPowers.forceCC();
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phase = "second tail time";
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e.target.onaudioprocess = null;
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}
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sourceCount++;
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}
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function startTest() {
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var ctx = new AudioContext();
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var delayDuration = delayLength / ctx.sampleRate;
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delay = ctx.createDelay(delayDuration);
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delay.delayTime.value = delayDuration;
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var processor1 = ctx.createScriptProcessor(bufferSize, 1, 0);
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delay.connect(processor1);
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processor1.onaudioprocess = onDelayOutput;
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processor1.connect(ctx.destination); // work around bug 916387
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// Signal to trigger initial tail time reference
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oscillator = ctx.createOscillator();
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oscillator.start(0);
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oscillator.stop(100/ctx.sampleRate);
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oscillator.connect(delay);
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// Short signal, not started yet, with a ScriptProcessor to detect when it
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// starts. It should finish before garbage collection.
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var buffer = ctx.createBuffer(1, signalLength, ctx.sampleRate);
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applySignal(buffer, 0);
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source = ctx.createBufferSource();
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source.buffer = buffer;
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var processor2 = ctx.createScriptProcessor(bufferSize, 1, 0);
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source.connect(processor2);
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processor2.onaudioprocess = onSourceOutput;
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processor2.connect(ctx.destination); // guard against bug 916387
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};
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startTest();
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</script>
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</pre>
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</body>
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</html>
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