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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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+<!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();
+ panner.type = "HRTF";
+ 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.type = "HRTF";
+ 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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