2013-10-25 01:05:42 +00:00
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<head>
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<title>Test tail time lifetime of PannerNode</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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// This tests that a PannerNode does not release its reference before
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// it finishes emitting sound.
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//
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// The PannerNode tail time is short, so, when a PannerNode is destroyed on
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// the main thread, it is unlikely to notify the graph thread before the tail
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// time expires. However, by adding DelayNodes downstream from the
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// PannerNodes, the graph thread can have enough time to notice that a
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// DelayNode has been destroyed.
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//
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// In the current implementation, DelayNodes will take a tail-time reference
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// immediately when they receive the first block of sound from an upstream
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// node, so this test connects the downstream DelayNodes while the upstream
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// nodes are finishing, and then runs GC (on the main thread) before the
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// DelayNodes receive any input (on the graph thread).
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//
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// Web Audio doesn't provide a means to precisely time connect()s but we can
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// test that the output of delay nodes matches the output from a reference
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2013-11-09 01:07:50 +00:00
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// PannerNode that we know will not be GCed.
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2013-10-25 01:05:42 +00:00
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//
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// Another set of delay nodes is added upstream to ensure that the source node
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// has removed its self-reference after dispatching its "ended" event.
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SimpleTest.waitForExplicitFinish();
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const blockSize = 128;
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// bufferSize should be long enough that to allow an audioprocess event to be
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// sent to the main thread and a connect message to return to the graph
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// thread.
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const bufferSize = 4096;
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const pannerCount = bufferSize / blockSize;
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// sourceDelayBufferCount should be long enough to allow the source node
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2013-11-09 01:07:50 +00:00
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// onended to finish and remove the source self-reference.
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2013-10-25 01:05:42 +00:00
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const sourceDelayBufferCount = 3;
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var gotEnded = false;
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// ccDelayLength should be long enough to allow CC to run
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var ccDelayBufferCount = 20;
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const ccDelayLength = ccDelayBufferCount * bufferSize;
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2013-11-09 01:07:50 +00:00
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var ctx;
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2013-10-25 01:05:42 +00:00
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var testPanners = [];
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var referencePanner;
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var referenceProcessCount = 0;
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var referenceOutput = [new Float32Array(bufferSize),
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new Float32Array(bufferSize)];
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var testProcessor;
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var testProcessCount = 0;
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2013-11-09 01:07:50 +00:00
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function isChannelSilent(channel) {
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for (var i = 0; i < channel.length; ++i) {
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if (channel[i] != 0.0) {
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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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2013-10-25 01:05:42 +00:00
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function onReferenceOutput(e) {
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switch(referenceProcessCount) {
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case sourceDelayBufferCount - 1:
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// The panners are about to finish.
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if (!gotEnded) {
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todo(false, "Source hasn't ended. Increase sourceDelayBufferCount?");
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2013-10-25 01:05:42 +00:00
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}
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// Connect each PannerNode output to a downstream DelayNode,
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// and connect ScriptProcessors to compare test and reference panners.
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var delayDuration = ccDelayLength / ctx.sampleRate;
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for (var i = 0; i < pannerCount; ++i) {
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var delay = ctx.createDelay(delayDuration);
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delay.delayTime.value = delayDuration;
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delay.connect(testProcessor);
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testPanners[i].connect(delay);
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}
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testProcessor = null;
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testPanners = null;
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2013-11-09 01:07:50 +00:00
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// The panning effect is linear so only one reference panner is required.
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// This also checks that the individual panners don't chop their output
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// too soon.
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2013-10-25 01:05:42 +00:00
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referencePanner.connect(e.target);
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// Assuming the above operations have already scheduled an event to run in
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// stable state and ask the graph thread to make connections, schedule a
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// subsequent event to run cycle collection, which should not collect
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// panners that are still producing sound.
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SimpleTest.executeSoon(function() {
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SpecialPowers.forceGC();
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SpecialPowers.forceCC();
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});
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break;
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case sourceDelayBufferCount:
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// Record this buffer during which PannerNode outputs were connected.
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for (var i = 0; i < 2; ++i) {
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e.inputBuffer.copyFromChannel(referenceOutput[i], i);
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}
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e.target.onaudioprocess = null;
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e.target.disconnect();
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// If the buffer is silent, there is probably not much point just
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// increasing the buffer size, because, with the buffer size already
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// significantly larger than panner tail time, it demonstrates that the
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// lag between threads is much greater than the tail time.
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if (isChannelSilent(referenceOutput[0])) {
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todo(false, "Connections not detected.");
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}
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2013-10-25 01:05:42 +00:00
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}
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referenceProcessCount++;
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}
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function onTestOutput(e) {
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if (testProcessCount < sourceDelayBufferCount + ccDelayBufferCount) {
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testProcessCount++;
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return;
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}
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for (var i = 0; i < 2; ++i) {
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compareChannels(e.inputBuffer.getChannelData(i), referenceOutput[i]);
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2013-10-25 01:05:42 +00:00
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}
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e.target.onaudioprocess = null;
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e.target.disconnect();
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SimpleTest.finish();
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}
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function startTest() {
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// 0.002 is MaxDelayTimeSeconds in HRTFpanner.cpp
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// and 512 is fftSize() at 48 kHz.
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const expectedPannerTailTime = 0.002 * ctx.sampleRate + 512;
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// Create some PannerNodes downstream from DelayNodes with delays long
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2013-11-09 01:07:50 +00:00
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// enough for their source to finish, dispatch its "ended" event
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2013-10-25 01:05:42 +00:00
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// and release its playing reference. The DelayNodes should expire their
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// tail-time references before the PannerNodes and so only the PannerNode
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// lifetimes depends on their tail-time references. Many DelayNodes are
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// created and timed to finish at different times so that one PannerNode
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// will be finishing the block processed immediately after the connect is
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// received.
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var source = ctx.createBufferSource();
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// Just short of blockSize here to avoid rounding into the next block
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var buffer = ctx.createBuffer(1, blockSize - 1, ctx.sampleRate);
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for (var i = 0; i < buffer.length; ++i) {
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buffer.getChannelData(0)[i] = Math.cos(Math.PI * i / buffer.length);
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}
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source.buffer = buffer;
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source.start(0);
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source.onended = function(e) {
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gotEnded = true;
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};
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// Time the first test panner to finish just before downstream DelayNodes
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// are about the be connected. Note that DelayNode lifetime depends on
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// maxDelayTime so set that equal to the delay.
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var delayDuration =
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(sourceDelayBufferCount * bufferSize
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- expectedPannerTailTime - 2 * blockSize) / ctx.sampleRate;
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for (var i = 0; i < pannerCount; ++i) {
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var delay = ctx.createDelay(delayDuration);
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delay.delayTime.value = delayDuration;
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source.connect(delay);
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delay.connect(referencePanner)
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var panner = ctx.createPanner();
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delay.connect(panner);
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testPanners[i] = panner;
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delayDuration += blockSize / ctx.sampleRate;
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}
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// Create a ScriptProcessor now to use as a timer to trigger connection of
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// downstream nodes. It will also be used to record reference output.
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var referenceProcessor = ctx.createScriptProcessor(bufferSize, 2, 0);
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referenceProcessor.onaudioprocess = onReferenceOutput;
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// Start audioprocess events before source delays are connected.
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referenceProcessor.connect(ctx.destination);
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// The test ScriptProcessor will record output of testPanners.
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// Create it now so that it is synchronized with the referenceProcessor.
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testProcessor = ctx.createScriptProcessor(bufferSize, 2, 0);
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testProcessor.onaudioprocess = onTestOutput;
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// Start audioprocess events before source delays are connected.
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testProcessor.connect(ctx.destination);
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}
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2013-11-09 01:07:50 +00:00
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function prepareTest() {
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ctx = new AudioContext();
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// Place the listener to the side of the origin, where the panners are
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// positioned, to maximize delay in one ear.
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ctx.listener.setPosition(1,0,0);
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// A PannerNode will produce no output until it has loaded its HRIR
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// database. Wait for this to load before starting the test.
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var processor = ctx.createScriptProcessor(bufferSize, 2, 0);
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referencePanner = ctx.createPanner();
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referencePanner.connect(processor);
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var oscillator = ctx.createOscillator();
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oscillator.connect(referencePanner);
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oscillator.start(0);
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processor.onaudioprocess = function(e) {
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if (isChannelSilent(e.inputBuffer.getChannelData(0)))
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return;
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oscillator.stop(0);
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oscillator.disconnect();
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referencePanner.disconnect();
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e.target.onaudioprocess = null;
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SimpleTest.executeSoon(startTest);
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};
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}
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prepareTest();
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2013-10-25 01:05:42 +00:00
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</script>
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</pre>
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</body>
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</html>
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