| <!DOCTYPE html> |
| <html> |
| <head> |
| <title> |
| scriptprocessornode-premature-death.html |
| </title> |
| <script src="../../resources/js-test.js"></script> |
| </head> |
| <body> |
| <script id="layout-test-code"> |
| description('Tests that a script processor node is not prematurely GCed'); |
| window.jsTestIsAsync = true; |
| |
| if (!window.internals) { |
| testFailed('This test requires window.internals.'); |
| finishJSTest(); |
| } |
| |
| let wasCalled, wasCollectedPrematurely, savedNode, savedCallback; |
| |
| function test(saveReference, nextStep) { |
| debug( |
| 'Testing ' + (saveReference ? 'with' : 'without') + ' explicitly ' + |
| 'keeping a reference to the script processor node alive.'); |
| |
| // Create an audio context |
| let context = new OfflineAudioContext( |
| 2, // channels |
| 4096, // length (frames) |
| 44100.0); // sample rate |
| |
| // Set up a source, reading from an empty buffer |
| let source = context.createBufferSource(); |
| source.buffer = context.createBuffer( |
| 2, // source channels |
| 4096, // length (frames) |
| 44100.0); // sample rate |
| |
| // Set up a script processor node to generate something |
| let node = context.createScriptProcessor( |
| 512, // buffer size |
| 0, // input channels |
| 2); // output channels |
| |
| // source -> script processor node -> destination |
| source.connect(node); |
| node.connect(context.destination); |
| |
| // Set up something which indicates whether we're called to |
| // generate anything |
| |
| wasCalled = false; |
| let callback = function() { |
| wasCalled = true; |
| }; |
| node.onaudioprocess = callback; |
| |
| if (saveReference) { |
| savedNode = node; |
| savedCallback = callback; |
| } |
| |
| // Watch the callback; if it dies, we're obviously not generating |
| // anything |
| |
| let observation = internals.observeGC(callback); |
| node = callback = null; |
| gc(); |
| wasCollectedPrematurely = observation.wasCollected; |
| |
| // Make some noise! |
| |
| source.start(0); |
| context.oncomplete = check(nextStep); |
| context.startRendering(); |
| } |
| |
| function check(nextStep) { |
| return function() { |
| shouldBeFalse('wasCollectedPrematurely'); |
| shouldBeTrue('wasCalled'); |
| nextStep(); |
| }; |
| } |
| |
| function step1() { |
| test(true, step2); |
| } |
| |
| function step2() { |
| test(false, finishJSTest); |
| } |
| |
| step1(); |
| |
| window.successfullyParsed = true; |
| </script> |
| </body> |
| </html> |
