зеркало из https://github.com/mozilla/gecko-dev.git
158 строки
4.3 KiB
HTML
158 строки
4.3 KiB
HTML
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<!DOCTYPE HTML>
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<html>
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<head>
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<title>Test the support of cycles.</title>
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<script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
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<script type="text/javascript" src="webaudio.js"></script>
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<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
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</head>
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<body>
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<pre id="test">
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<script src="webaudio.js" type="text/javascript"></script>
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<script class="testbody" type="text/javascript">
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SimpleTest.waitForExplicitFinish();
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const sampleRate = 48000;
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const inputLength = 2048;
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addLoadEvent(function() {
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function addSine(b) {
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for (var i = 0; i < b.length; i++) {
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b[i] += Math.sin(440 * 2 * Math.PI * i / sampleRate);
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}
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}
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function getSineBuffer(ctx) {
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var buffer = ctx.createBuffer(1, inputLength, ctx.sampleRate);
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addSine(buffer.getChannelData(0));
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return buffer;
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}
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function createAndPlayWithCycleAndDelayNode(ctx, delayFrames) {
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var source = ctx.createBufferSource();
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source.buffer = getSineBuffer(ctx);
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var gain = ctx.createGain();
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var delay = ctx.createDelay();
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delay.delayTime.value = delayFrames/ctx.sampleRate;
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source.connect(gain);
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gain.connect(delay);
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delay.connect(ctx.destination);
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// cycle
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delay.connect(gain);
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source.start(0);
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}
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function createAndPlayWithCycleAndNoDelayNode(ctx) {
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var source = ctx.createBufferSource();
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source.loop = true;
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source.buffer = getSineBuffer(ctx);
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var gain = ctx.createGain();
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var gain2 = ctx.createGain();
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source.connect(gain);
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gain.connect(gain2);
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// cycle
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gain2.connect(gain);
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gain2.connect(ctx.destination);
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source.start(0);
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}
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function createAndPlayWithCycleAndNoDelayNodeInCycle(ctx) {
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var source = ctx.createBufferSource();
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source.loop = true;
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source.buffer = getSineBuffer(ctx);
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var delay = ctx.createDelay();
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var gain = ctx.createGain();
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var gain2 = ctx.createGain();
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// Their is a cycle, a delay, but the delay is not in the cycle.
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source.connect(delay);
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delay.connect(gain);
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gain.connect(gain2);
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// cycle
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gain2.connect(gain);
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gain2.connect(ctx.destination);
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source.start(0);
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}
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var remainingTests = 0;
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function finish() {
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if (--remainingTests == 0) {
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SimpleTest.finish();
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}
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}
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function getOfflineContext(oncomplete) {
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var ctx = new OfflineAudioContext(1, sampleRate, sampleRate);
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ctx.oncomplete = oncomplete;
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return ctx;
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}
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function checkSilentBuffer(e) {
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var buffer = e.renderedBuffer.getChannelData(0);
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for (var i = 0; i < buffer.length; i++) {
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if (buffer[i] != 0.0) {
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ok(false, "buffer should be silent.");
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finish();
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return;
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}
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}
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ok(true, "buffer should be silent.");
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finish();
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}
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function checkNoisyBuffer(e, aDelayFrames) {
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delayFrames = Math.max(128, aDelayFrames);
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var expected = new Float32Array(e.renderedBuffer.length);
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for (var i = delayFrames; i < expected.length; i += delayFrames) {
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addSine(expected.subarray(i, i + inputLength));
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}
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compareChannels(e.renderedBuffer.getChannelData(0), expected);
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finish();
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}
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function expectSilentOutput(f) {
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remainingTests++;
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var ctx = getOfflineContext(checkSilentBuffer);
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f(ctx);
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ctx.startRendering();
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}
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function expectNoisyOutput(delayFrames) {
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remainingTests++;
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var ctx = getOfflineContext();
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ctx.oncomplete = function(e) { checkNoisyBuffer(e, delayFrames); };
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createAndPlayWithCycleAndDelayNode(ctx, delayFrames);
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ctx.startRendering();
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}
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// This is trying to make a graph with a cycle and no DelayNode in the graph.
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// The cycle subgraph should be muted, in this graph the output should be silent.
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expectSilentOutput(createAndPlayWithCycleAndNoDelayNode);
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// This is trying to make a graph with a cycle and a DelayNode in the graph, but
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// not part of the cycle.
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// The cycle subgraph should be muted, in this graph the output should be silent.
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expectSilentOutput(createAndPlayWithCycleAndNoDelayNodeInCycle);
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// Those are making legal graphs, with at least one DelayNode in the cycle.
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// There should be some non-silent output.
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expectNoisyOutput(sampleRate/4);
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// DelayNode.delayTime will be clamped to 128/ctx.sampleRate.
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// There should be some non-silent output.
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expectNoisyOutput(0);
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});
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</script>
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</pre>
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</body>
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</html>
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