зеркало из https://github.com/mozilla/gecko-dev.git
73 строки
2.4 KiB
HTML
73 строки
2.4 KiB
HTML
<!DOCTYPE HTML>
|
|
<html>
|
|
<head>
|
|
<title>Test GainNode</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">
|
|
|
|
var gTest = {
|
|
length: 2048,
|
|
numberOfChannels: 1,
|
|
createGraph(context) {
|
|
|
|
var gain = new GainNode(context);
|
|
ok(gain.gain, "The audioparam member must exist");
|
|
is(gain.gain.value, 1.0, "Correct initial value");
|
|
is(gain.gain.defaultValue, 1.0, "Correct default value");
|
|
gain.gain.value = 0.5;
|
|
is(gain.gain.value, 0.5, "Correct initial value");
|
|
is(gain.gain.defaultValue, 1.0, "Correct default value");
|
|
|
|
gain = new GainNode(context, { gain: 0.5 });
|
|
ok(gain.gain, "The audioparam member must exist");
|
|
is(gain.gain.value, 0.5, "Correct initial value");
|
|
is(gain.gain.defaultValue, 1.0, "Correct default value");
|
|
gain.gain.value = 0.5;
|
|
is(gain.gain.value, 0.5, "Correct initial value");
|
|
is(gain.gain.defaultValue, 1.0, "Correct default value");
|
|
|
|
var buffer = context.createBuffer(1, 2048, context.sampleRate);
|
|
for (var i = 0; i < 2048; ++i) {
|
|
buffer.getChannelData(0)[i] = Math.sin(440 * 2 * Math.PI * i / context.sampleRate);
|
|
}
|
|
|
|
var source = context.createBufferSource();
|
|
source.buffer = buffer;
|
|
|
|
gain = context.createGain();
|
|
source.connect(gain);
|
|
|
|
ok(gain.gain, "The audioparam member must exist");
|
|
is(gain.gain.value, 1.0, "Correct initial value");
|
|
is(gain.gain.defaultValue, 1.0, "Correct default value");
|
|
gain.gain.value = 0.5;
|
|
is(gain.gain.value, 0.5, "Correct initial value");
|
|
is(gain.gain.defaultValue, 1.0, "Correct default value");
|
|
is(gain.channelCount, 2, "gain node has 2 input channels by default");
|
|
is(gain.channelCountMode, "max", "Correct channelCountMode for the gain node");
|
|
is(gain.channelInterpretation, "speakers", "Correct channelCountInterpretation for the gain node");
|
|
|
|
source.start(0);
|
|
return gain;
|
|
},
|
|
createExpectedBuffers(context) {
|
|
var expectedBuffer = context.createBuffer(1, 2048, context.sampleRate);
|
|
for (var i = 0; i < 2048; ++i) {
|
|
expectedBuffer.getChannelData(0)[i] = Math.sin(440 * 2 * Math.PI * i / context.sampleRate) / 2;
|
|
}
|
|
return expectedBuffer;
|
|
},
|
|
};
|
|
|
|
runTest();
|
|
|
|
</script>
|
|
</pre>
|
|
</body>
|
|
</html>
|