71 lines
2.4 KiB
JavaScript
71 lines
2.4 KiB
JavaScript
var sampleRate = 44100.0;
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var renderLengthSeconds = 4;
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var delayTimeSeconds = 0.5;
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var toneLengthSeconds = 2;
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function createToneBuffer(context, frequency, numberOfCycles, sampleRate) {
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var duration = numberOfCycles / frequency;
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var sampleFrameLength = duration * sampleRate;
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var audioBuffer = context.createBuffer(1, sampleFrameLength, sampleRate);
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var n = audioBuffer.length;
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var data = audioBuffer.getChannelData(0);
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for (var i = 0; i < n; ++i)
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data[i] = Math.sin(frequency * 2.0*Math.PI * i / sampleRate);
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return audioBuffer;
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}
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function checkDelayedResult(toneBuffer) {
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return function(event) {
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var renderedBuffer = event.renderedBuffer;
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var sourceData = toneBuffer.getChannelData(0);
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var renderedData = renderedBuffer.getChannelData(0);
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var delayTimeFrames = delayTimeSeconds * sampleRate;
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var toneLengthFrames = toneLengthSeconds * sampleRate;
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var success = true;
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var n = renderedBuffer.length;
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for (var i = 0; i < n; ++i) {
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if (i < delayTimeFrames) {
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// Check that initial portion is 0 (since signal is delayed).
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if (renderedData[i] != 0) {
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testFailed("Initial portion is not 0 at frame " + i);
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success = false;
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break;
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}
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} else if (i >= delayTimeFrames && i < delayTimeFrames + toneLengthFrames) {
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// Make sure that the tone data is delayed by exactly the expected number of frames.
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var j = i - delayTimeFrames;
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if (renderedData[i] != sourceData[j]) {
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testFailed("Actual data does not match expected data at frame " + i);
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success = false;
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break;
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}
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} else {
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// Make sure we have silence after the delayed tone.
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if (renderedData[i] != 0) {
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testFailed("Final portion is not 0 at frame " + i);
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success = false;
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break;
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}
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}
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}
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if (success) {
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testPassed("Test signal was correctly delayed by " + delayTimeSeconds + " sec.");
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} else {
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testFailed("Test signal was not correctly delayed by " + delayTimeSeconds + " sec.");
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}
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finishJSTest();
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}
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}
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