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Diffstat (limited to 'dom/media/webaudio/test/test_oscillatorTypeChange.html')
-rw-r--r-- | dom/media/webaudio/test/test_oscillatorTypeChange.html | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/dom/media/webaudio/test/test_oscillatorTypeChange.html b/dom/media/webaudio/test/test_oscillatorTypeChange.html new file mode 100644 index 0000000000..e4b4944703 --- /dev/null +++ b/dom/media/webaudio/test/test_oscillatorTypeChange.html @@ -0,0 +1,58 @@ +<!DOCTYPE HTML> +<html> +<head> + <title>Test OscillatorNode type change after it has started and triangle phase</title> + <script 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"> + +SimpleTest.waitForExplicitFinish(); + +const bufferSize = 1024; + +function startTest() { + var ctx = new AudioContext(); + + var oscillator1 = ctx.createOscillator(); + oscillator1.connect(ctx.destination); + oscillator1.start(0); + + // Assuming the above Web Audio operations have already scheduled an event + // to run in stable state and start the graph thread, schedule a subsequent + // event to change the type of oscillator1. + SimpleTest.executeSoon(function() { + oscillator1.type = "triangle"; + + // Another triangle wave with -1 gain should cancel the first. This is + // starting at the same time as the type change, assuming that the phase + // is reset on type change. A negative frequency should achieve the same + // as the -1 gain but for bug 916285. + var oscillator2 = ctx.createOscillator(); + oscillator2.type = "triangle"; + oscillator2.start(0); + + var processor = ctx.createScriptProcessor(bufferSize, 1, 0); + oscillator1.connect(processor); + var gain = ctx.createGain(); + gain.gain.value = -1; + gain.connect(processor); + oscillator2.connect(gain); + + processor.onaudioprocess = function(e) { + compareChannels(e.inputBuffer.getChannelData(0), + new Float32Array(bufferSize)); + e.target.onaudioprocess = null; + SimpleTest.finish(); + } + }); +}; + +startTest(); +</script> +</pre> +</body> +</html> |