124 lines
3.6 KiB
HTML
124 lines
3.6 KiB
HTML
<!DOCTYPE html>
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<!--
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Tests that multiple audio-rate signals (AudioNode outputs) can be connected to an AudioParam
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and that these signals are summed, along with the AudioParams intrinsic value.
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-->
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<html>
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<head>
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<script src="resources/audio-testing.js"></script>
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<script src="resources/mix-testing.js"></script>
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<script src="../resources/js-test.js"></script>
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</head>
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<body>
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<script>
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var sampleRate = 44100.0;
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var lengthInSeconds = 1;
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var context = 0;
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// Buffers used by the two gain controlling sources.
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var linearRampBuffer;
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var toneBuffer;
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var toneFrequency = 440;
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// Arbitrary non-zero value.
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var baselineGain = 5;
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// Allow for a small round-off error.
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var maxAllowedError = 1e-6;
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function checkResult(event) {
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var renderedBuffer = event.renderedBuffer;
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var renderedData = renderedBuffer.getChannelData(0);
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// Get buffer data from the two sources used to control gain.
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var linearRampData = linearRampBuffer.getChannelData(0);
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var toneData = toneBuffer.getChannelData(0);
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var n = renderedBuffer.length;
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if (n == linearRampBuffer.length) {
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testPassed("Rendered signal is of correct length.");
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} else {
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testFailed("Rendered signal is not of correct length.");
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}
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// Check that the rendered result exactly matches the sum of the intrinsic gain plus the two sources used to control gain.
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// This is because we're changing the gain of a signal having constant value 1.
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var success = true;
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for (var i = 0; i < n; ++i) {
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var expectedValue = baselineGain + linearRampData[i] + toneData[i];
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var error = Math.abs(expectedValue - renderedData[i]);
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if (error > maxAllowedError) {
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success = false;
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break;
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}
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}
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if (success) {
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testPassed("Rendered signal matches sum of two audio-rate gain changing signals plus baseline gain.");
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} else {
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testFailed("Rendered signal differs from the sum of two audio-rate gain changing signals plus baseline gain.");
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}
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finishJSTest();
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}
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function runTest() {
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window.jsTestIsAsync = true;
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var sampleFrameLength = sampleRate * lengthInSeconds;
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// Create offline audio context.
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context = new OfflineAudioContext(1, sampleFrameLength, sampleRate);
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// Create buffer used by the source which will have its gain controlled.
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var constantOneBuffer = createConstantBuffer(context, sampleFrameLength, 1);
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var constantSource = context.createBufferSource();
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constantSource.buffer = constantOneBuffer;
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// Create 1st buffer used to control gain (a linear ramp).
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linearRampBuffer = createLinearRampBuffer(context, sampleFrameLength);
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var gainSource1 = context.createBufferSource();
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gainSource1.buffer = linearRampBuffer;
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// Create 2st buffer used to control gain (a simple sine wave tone).
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toneBuffer = createToneBuffer(context, toneFrequency, lengthInSeconds, 1);
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var gainSource2 = context.createBufferSource();
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gainSource2.buffer = toneBuffer;
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// Create a gain node controlling the gain of constantSource and make the connections.
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var gainNode = context.createGain();
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// Intrinsic baseline gain.
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// This gain value should be summed with gainSource1 and gainSource2.
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gainNode.gain.value = baselineGain;
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constantSource.connect(gainNode);
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gainNode.connect(context.destination);
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// Connect two audio-rate signals to control the .gain AudioParam.
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gainSource1.connect(gainNode.gain);
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gainSource2.connect(gainNode.gain);
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// Start all sources at time 0.
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constantSource.start(0);
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gainSource1.start(0);
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gainSource2.start(0);
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context.oncomplete = checkResult;
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context.startRendering();
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}
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runTest();
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</script>
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</body>
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</html>
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