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| author | Matt A. Tobin <mattatobin@localhost.localdomain> | 2018-02-02 04:16:08 -0500 |
|---|---|---|
| committer | Matt A. Tobin <mattatobin@localhost.localdomain> | 2018-02-02 04:16:08 -0500 |
| commit | 5f8de423f190bbb79a62f804151bc24824fa32d8 (patch) | |
| tree | 10027f336435511475e392454359edea8e25895d /dom/media/webaudio/test/test_audioParamGain.html | |
| parent | 49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff) | |
| download | UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar.gz UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar.lz UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.tar.xz UXP-5f8de423f190bbb79a62f804151bc24824fa32d8.zip | |
Add m-esr52 at 52.6.0
Diffstat (limited to 'dom/media/webaudio/test/test_audioParamGain.html')
| -rw-r--r-- | dom/media/webaudio/test/test_audioParamGain.html | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/dom/media/webaudio/test/test_audioParamGain.html b/dom/media/webaudio/test/test_audioParamGain.html new file mode 100644 index 000000000..b971becce --- /dev/null +++ b/dom/media/webaudio/test/test_audioParamGain.html @@ -0,0 +1,61 @@ +<!DOCTYPE HTML> +<html> +<head> + <title>Test AudioParam with pre-gain </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"> + +SimpleTest.waitForExplicitFinish(); + +var ctx = new AudioContext(); +var source = ctx.createOscillator(); +var lfo = ctx.createOscillator(); +var lfoIntensity = ctx.createGain(); +var effect = ctx.createGain(); +var sp = ctx.createScriptProcessor(2048, 1); + +source.frequency.value = 440; +lfo.frequency.value = 2; +// Very low gain, so the LFO should have very little influence +// on the source, its RMS value should be close to the nominal value +// for a sine wave. +lfoIntensity.gain.value = 0.0001; + +lfo.connect(lfoIntensity); +lfoIntensity.connect(effect.gain); +source.connect(effect); +effect.connect(sp); + +sp.onaudioprocess = function(e) { + var buffer = e.inputBuffer.getChannelData(0); + var rms = 0; + for (var i = 0; i < buffer.length; i++) { + rms += buffer[i] * buffer[i]; + } + + rms /= buffer.length; + rms = Math.sqrt(rms); + + // 1 / Math.sqrt(2) is the theoretical RMS value for a sine wave. + ok(fuzzyCompare(rms, 1 / Math.sqrt(2)), + "Gain correctly applied to the AudioParam."); + + ctx = null; + sp.onaudioprocess = null; + lfo.stop(0); + source.stop(0); + + SimpleTest.finish(); +} + +lfo.start(0); +source.start(0); + +</script> +</pre> +</body> |