2015-07-17 04:24:54 +03:00
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<!DOCTYPE html>
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<title>Test effect of AnalyserNode on GainNode output</title>
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script>
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2015-07-28 02:03:31 +03:00
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promise_test(function() {
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// fftSize <= bufferSize so that the time domain data is full of input after
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// processing the buffer.
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2015-07-17 04:24:54 +03:00
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const fftSize = 32;
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2015-07-28 02:03:31 +03:00
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const bufferSize = 128;
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2015-07-17 04:24:54 +03:00
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2015-07-28 02:03:31 +03:00
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var context = new OfflineAudioContext(1, bufferSize, 48000);
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2015-07-17 04:24:54 +03:00
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var analyser1 = context.createAnalyser();
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analyser1.fftSize = fftSize;
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2015-07-28 02:03:31 +03:00
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analyser1.connect(context.destination);
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2015-07-17 04:24:54 +03:00
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var analyser2 = context.createAnalyser();
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analyser2.fftSize = fftSize;
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var gain = context.createGain();
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gain.gain.value = 2.0;
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gain.connect(analyser1);
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gain.connect(analyser2);
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// Create a DC input to make getFloatTimeDomainData() output consistent at
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// any time.
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var buffer = context.createBuffer(1, 1, context.sampleRate);
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buffer.getChannelData(0)[0] = 1.0 / gain.gain.value;
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var source = context.createBufferSource();
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source.buffer = buffer;
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source.loop = true;
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source.connect(gain);
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source.start();
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2015-07-28 02:03:31 +03:00
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return context.startRendering().
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then(function(buffer) {
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assert_equals(buffer.getChannelData(0)[0], 1.0,
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"analyser1 output");
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2015-07-17 04:24:54 +03:00
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2015-07-28 02:03:31 +03:00
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var data = new Float32Array(1);
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analyser1.getFloatTimeDomainData(data);
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assert_equals(data[0], 1.0, "analyser1 time domain data");
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analyser2.getFloatTimeDomainData(data);
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assert_equals(data[0], 1.0, "analyser2 time domain data");
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});
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2015-07-17 04:24:54 +03:00
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});
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</script>
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