<!DOCTYPE HTML> <html> <head> <title>Test DynamicsCompressorNode</title> <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script> <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" /> </head> <body> <pre id="test"> <script class="testbody" type="text/javascript"> function near(a, b, msg) { ok(Math.abs(a - b) < 1e-4, msg); } SimpleTest.waitForExplicitFinish(); addLoadEvent(function() { var context = new AudioContext(); var osc = context.createOscillator(); var sp = context.createScriptProcessor(); var compressor = context.createDynamicsCompressor(); osc.connect(compressor); osc.connect(sp); compressor.connect(context.destination); is(compressor.channelCount, 2, "compressor node has 2 input channels by default"); is(compressor.channelCountMode, "explicit", "Correct channelCountMode for the compressor node"); is(compressor.channelInterpretation, "speakers", "Correct channelCountInterpretation for the compressor node"); // Verify default values with (compressor) { ok(threshold instanceof AudioParam, "treshold is an AudioParam"); near(threshold.defaultValue, -24, "Correct default value for threshold"); ok(knee instanceof AudioParam, "knee is an AudioParam"); near(knee.defaultValue, 30, "Correct default value for knee"); ok(ratio instanceof AudioParam, "knee is an AudioParam"); near(ratio.defaultValue, 12, "Correct default value for ratio"); is(typeof reduction, "number", "reduction is a number"); near(reduction, 0, "Correct default value for reduction"); ok(attack instanceof AudioParam, "attack is an AudioParam"); near(attack.defaultValue, 0.003, "Correct default value for attack"); ok(release instanceof AudioParam, "release is an AudioParam"); near(release.defaultValue, 0.25, "Correct default value for release"); } compressor.threshold.value = -80; osc.start(); var iteration = 0; sp.onaudioprocess = function(e) { if (iteration > 10) { ok(compressor.reduction < 0, "Feeding a full-scale sine to a compressor should result in an db" + "reduction."); sp.onaudioprocess = null; osc.stop(0); SimpleTest.finish(); } iteration++; } }); </script> </pre> </body> </html>