The Tor Browser: comparison content/media/webaudio/test/test

--1:000000000000
+:daf54d840e1d
+<!DOCTYPE HTML>
+<html>
+<head>
+<title>Test tail time lifetime of PannerNode</title>
+<script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+<script type="text/javascript" src="webaudio.js"></script>
+<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+// This tests that a PannerNode does not release its reference before
+// it finishes emitting sound.
+//
+// The PannerNode tail time is short, so, when a PannerNode is destroyed on
+// the main thread, it is unlikely to notify the graph thread before the tail
+// time expires.  However, by adding DelayNodes downstream from the
+// PannerNodes, the graph thread can have enough time to notice that a
+// DelayNode has been destroyed.
+//
+// In the current implementation, DelayNodes will take a tail-time reference
+// immediately when they receive the first block of sound from an upstream
+// node, so this test connects the downstream DelayNodes while the upstream
+// nodes are finishing, and then runs GC (on the main thread) before the
+// DelayNodes receive any input (on the graph thread).
+//
+// Web Audio doesn't provide a means to precisely time connect()s but we can
+// test that the output of delay nodes matches the output from a reference
+// PannerNode that we know will not be GCed.
+//
+// Another set of delay nodes is added upstream to ensure that the source node
+// has removed its self-reference after dispatching its "ended" event.
+SimpleTest.waitForExplicitFinish();
+const blockSize = 128;
+// bufferSize should be long enough that to allow an audioprocess event to be
+// sent to the main thread and a connect message to return to the graph
+// thread.
+const bufferSize = 4096;
+const pannerCount = bufferSize / blockSize;
+// sourceDelayBufferCount should be long enough to allow the source node
+// onended to finish and remove the source self-reference.
+const sourceDelayBufferCount = 3;
+var gotEnded = false;
+// ccDelayLength should be long enough to allow CC to run
+var ccDelayBufferCount = 20;
+const ccDelayLength = ccDelayBufferCount * bufferSize;
+var ctx;
+var testPanners = [];
+var referencePanner;
+var referenceProcessCount = 0;
+var referenceOutput = [new Float32Array(bufferSize),
+new Float32Array(bufferSize)];
+var testProcessor;
+var testProcessCount = 0;
+function isChannelSilent(channel) {
+for (var i = 0; i < channel.length; ++i) {
+if (channel[i] != 0.0) {
+return false;
+}
+}
+return true;
+}
+function onReferenceOutput(e) {
+switch(referenceProcessCount) {
+case sourceDelayBufferCount - 1:
+// The panners are about to finish.
+if (!gotEnded) {
+todo(false, "Source hasn't ended.  Increase sourceDelayBufferCount?");
+}
+// Connect each PannerNode output to a downstream DelayNode,
+// and connect ScriptProcessors to compare test and reference panners.
+var delayDuration = ccDelayLength / ctx.sampleRate;
+for (var i = 0; i < pannerCount; ++i) {
+var delay = ctx.createDelay(delayDuration);
+delay.delayTime.value = delayDuration;
+delay.connect(testProcessor);
+testPanners[i].connect(delay);
+}
+testProcessor = null;
+testPanners = null;
+// The panning effect is linear so only one reference panner is required.
+// This also checks that the individual panners don't chop their output
+// too soon.
+referencePanner.connect(e.target);
+// Assuming the above operations have already scheduled an event to run in
+// stable state and ask the graph thread to make connections, schedule a
+// subsequent event to run cycle collection, which should not collect
+// panners that are still producing sound.
+SimpleTest.executeSoon(function() {
+SpecialPowers.forceGC();
+SpecialPowers.forceCC();
+});
+break;
+case sourceDelayBufferCount:
+// Record this buffer during which PannerNode outputs were connected.
+for (var i = 0; i < 2; ++i) {
+e.inputBuffer.copyFromChannel(referenceOutput[i], i);
+}
+e.target.onaudioprocess = null;
+e.target.disconnect();
+// If the buffer is silent, there is probably not much point just
+// increasing the buffer size, because, with the buffer size already
+// significantly larger than panner tail time, it demonstrates that the
+// lag between threads is much greater than the tail time.
+if (isChannelSilent(referenceOutput[0])) {
+todo(false, "Connections not detected.");
+}
+}
+referenceProcessCount++;
+}
+function onTestOutput(e) {
+if (testProcessCount < sourceDelayBufferCount + ccDelayBufferCount) {
+testProcessCount++;
+return;
+}
+for (var i = 0; i < 2; ++i) {
+compareChannels(e.inputBuffer.getChannelData(i), referenceOutput[i]);
+}
+e.target.onaudioprocess = null;
+e.target.disconnect();
+SimpleTest.finish();
+}
+function startTest() {
+// 0.002 is MaxDelayTimeSeconds in HRTFpanner.cpp
+// and 512 is fftSize() at 48 kHz.
+const expectedPannerTailTime = 0.002 * ctx.sampleRate + 512;
+// Create some PannerNodes downstream from DelayNodes with delays long
+// enough for their source to finish, dispatch its "ended" event
+// and release its playing reference.  The DelayNodes should expire their
+// tail-time references before the PannerNodes and so only the PannerNode
+// lifetimes depends on their tail-time references.  Many DelayNodes are
+// created and timed to finish at different times so that one PannerNode
+// will be finishing the block processed immediately after the connect is
+// received.
+var source = ctx.createBufferSource();
+// Just short of blockSize here to avoid rounding into the next block
+var buffer = ctx.createBuffer(1, blockSize - 1, ctx.sampleRate);
+for (var i = 0; i < buffer.length; ++i) {
+buffer.getChannelData(0)[i] = Math.cos(Math.PI * i / buffer.length);
+}
+source.buffer = buffer;
+source.start(0);
+source.onended = function(e) {
+gotEnded = true;
+};
+// Time the first test panner to finish just before downstream DelayNodes
+// are about the be connected.  Note that DelayNode lifetime depends on
+// maxDelayTime so set that equal to the delay.
+var delayDuration =
+(sourceDelayBufferCount * bufferSize
+- expectedPannerTailTime - 2 * blockSize) / ctx.sampleRate;
+for (var i = 0; i < pannerCount; ++i) {
+var delay = ctx.createDelay(delayDuration);
+delay.delayTime.value = delayDuration;
+source.connect(delay);
+delay.connect(referencePanner)
+var panner = ctx.createPanner();
+delay.connect(panner);
+testPanners[i] = panner;
+delayDuration += blockSize / ctx.sampleRate;
+}
+// Create a ScriptProcessor now to use as a timer to trigger connection of
+// downstream nodes.  It will also be used to record reference output.
+var referenceProcessor = ctx.createScriptProcessor(bufferSize, 2, 0);
+referenceProcessor.onaudioprocess = onReferenceOutput;
+// Start audioprocess events before source delays are connected.
+referenceProcessor.connect(ctx.destination);
+// The test ScriptProcessor will record output of testPanners.
+// Create it now so that it is synchronized with the referenceProcessor.
+testProcessor = ctx.createScriptProcessor(bufferSize, 2, 0);
+testProcessor.onaudioprocess = onTestOutput;
+// Start audioprocess events before source delays are connected.
+testProcessor.connect(ctx.destination);
+}
+function prepareTest() {
+ctx = new AudioContext();
+// Place the listener to the side of the origin, where the panners are
+// positioned, to maximize delay in one ear.
+ctx.listener.setPosition(1,0,0);
+// A PannerNode will produce no output until it has loaded its HRIR
+// database.  Wait for this to load before starting the test.
+var processor = ctx.createScriptProcessor(bufferSize, 2, 0);
+referencePanner = ctx.createPanner();
+referencePanner.connect(processor);
+var oscillator = ctx.createOscillator();
+oscillator.connect(referencePanner);
+oscillator.start(0);
+processor.onaudioprocess = function(e) {
+if (isChannelSilent(e.inputBuffer.getChannelData(0)))
+return;
+oscillator.stop(0);
+oscillator.disconnect();
+referencePanner.disconnect();
+e.target.onaudioprocess = null;
+SimpleTest.executeSoon(startTest);
+};
+}
+prepareTest();
+</script>
+</pre>
+</body>
+</html>

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comparison: content/media/webaudio/test/test_pannerNodeTail.html

content/media/webaudio/test/test_pannerNodeTail.html