1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/webaudio/test/test_delayNodeCycles.html Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,170 @@
1.4 +<!DOCTYPE HTML>
1.5 +<html>
1.6 +<head>
1.7 + <title>Test the support of cycles.</title>
1.8 + <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
1.9 + <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
1.10 +</head>
1.11 +<body>
1.12 +<pre id="test">
1.13 +<script src="webaudio.js" type="text/javascript"></script>
1.14 +<script class="testbody" type="text/javascript">
1.15 +
1.16 +SimpleTest.waitForExplicitFinish();
1.17 +
1.18 +addLoadEvent(function() {
1.19 + function getSineBuffer(ctx) {
1.20 + var buffer = ctx.createBuffer(1, 2048, ctx.sampleRate);
1.21 + var b = buffer.getChannelData(0);
1.22 + for (var i = 0; i < 2048; i++) {
1.23 + b[i] = Math.sin(440 * 2 * Math.PI * i / ctx.sampleRate);
1.24 + }
1.25 + return buffer;
1.26 + }
1.27 +
1.28 + function createAndPlayWithCycleAndDelayNode(ctx) {
1.29 + var source = ctx.createBufferSource();
1.30 + source.loop = true;
1.31 + source.buffer = getSineBuffer(ctx);
1.32 +
1.33 + var gain = ctx.createGain();
1.34 + var delay = ctx.createDelay();
1.35 + delay.delayTime = 0.5;
1.36 +
1.37 + source.connect(gain);
1.38 + gain.connect(delay);
1.39 + delay.connect(ctx.destination);
1.40 + // cycle
1.41 + delay.connect(gain);
1.42 +
1.43 + source.start(0);
1.44 + }
1.45 +
1.46 + function createAndPlayWithCycleAndDelayNodeButNullDelayTime(ctx) {
1.47 + var source = ctx.createBufferSource();
1.48 + source.loop = true;
1.49 + source.buffer = getSineBuffer(ctx);
1.50 +
1.51 + var gain = ctx.createGain();
1.52 + var delay = ctx.createDelay();
1.53 + delay.delayTime = 0.0;
1.54 +
1.55 + source.connect(gain);
1.56 + gain.connect(delay);
1.57 + delay.connect(ctx.destination);
1.58 + // cycle
1.59 + delay.connect(gain);
1.60 +
1.61 + source.start(0);
1.62 + }
1.63 +
1.64 + function createAndPlayWithCycleAndNoDelayNode(ctx) {
1.65 + var source = ctx.createBufferSource();
1.66 + source.loop = true;
1.67 + source.buffer = getSineBuffer(ctx);
1.68 +
1.69 + var gain = ctx.createGain();
1.70 + var gain2 = ctx.createGain();
1.71 +
1.72 + source.connect(gain);
1.73 + gain.connect(gain2);
1.74 + // cycle
1.75 + gain2.connect(gain);
1.76 + gain2.connect(ctx.destination);
1.77 +
1.78 + source.start(0);
1.79 + }
1.80 +
1.81 + function createAndPlayWithCycleAndNoDelayNodeInCycle(ctx) {
1.82 + var source = ctx.createBufferSource();
1.83 + source.loop = true;
1.84 + source.buffer = getSineBuffer(ctx);
1.85 +
1.86 + var delay = ctx.createDelay();
1.87 + var gain = ctx.createGain();
1.88 + var gain2 = ctx.createGain();
1.89 +
1.90 + // Their is a cycle, a delay, but the delay is not in the cycle.
1.91 + source.connect(delay);
1.92 + delay.connect(gain);
1.93 + gain.connect(gain2);
1.94 + // cycle
1.95 + gain2.connect(gain);
1.96 + gain2.connect(ctx.destination);
1.97 +
1.98 + source.start(0);
1.99 + }
1.100 +
1.101 + var remainingTests = 0;
1.102 + function finish() {
1.103 + if (--remainingTests == 0) {
1.104 + SimpleTest.finish();
1.105 + }
1.106 + }
1.107 +
1.108 + function getOfflineContext(oncomplete) {
1.109 + var ctx = new OfflineAudioContext(1, 48000, 48000);
1.110 + ctx.oncomplete = oncomplete;
1.111 + return ctx;
1.112 + }
1.113 +
1.114 + function checkSilentBuffer(e) {
1.115 + var buffer = e.renderedBuffer.getChannelData(0);
1.116 + for (var i = 0; i < buffer.length; i++) {
1.117 + if (buffer[i] != 0.0) {
1.118 + ok(false, "buffer should be silent.");
1.119 + finish();
1.120 + return;
1.121 + }
1.122 + }
1.123 + ok(true, "buffer should be silent.");
1.124 + finish();
1.125 + }
1.126 +
1.127 + function checkNoisyBuffer(e) {
1.128 + var buffer = e.renderedBuffer.getChannelData(0);
1.129 + for (var i = 0; i < buffer.length; i++) {
1.130 + if (buffer[i] != 0.0) {
1.131 + ok(true, "buffer should be noisy.");
1.132 + finish();
1.133 + return true;
1.134 + }
1.135 + }
1.136 + ok(false, "buffer should be noisy.");
1.137 + finish();
1.138 + return false;
1.139 + }
1.140 +
1.141 + function expectSilentOutput(f) {
1.142 + remainingTests++;
1.143 + var ctx = getOfflineContext(checkSilentBuffer);
1.144 + f(ctx);
1.145 + ctx.startRendering();
1.146 + }
1.147 +
1.148 + function expectNoisyOutput(f) {
1.149 + remainingTests++;
1.150 + var ctx = getOfflineContext(checkNoisyBuffer);
1.151 + f(ctx);
1.152 + ctx.startRendering();
1.153 + }
1.154 +
1.155 + // This is trying to make a graph with a cycle and no DelayNode in the graph.
1.156 + // The cycle subgraph should be muted, in this graph the output should be silent.
1.157 + expectSilentOutput(createAndPlayWithCycleAndNoDelayNode);
1.158 + // This is trying to make a graph with a cycle and a DelayNode in the graph, but
1.159 + // not part of the cycle.
1.160 + // The cycle subgraph should be muted, in this graph the output should be silent.
1.161 + expectSilentOutput(createAndPlayWithCycleAndNoDelayNodeInCycle);
1.162 + // Those are making legal graphs, with at least one DelayNode in the cycle.
1.163 + // There should be some non-silent output.
1.164 + expectNoisyOutput(createAndPlayWithCycleAndDelayNode);
1.165 + // DelayNode.delayTime will be clamped to 128/ctx.sampleRate.
1.166 + // There should be some non-silent output.
1.167 + expectNoisyOutput(createAndPlayWithCycleAndDelayNodeButNullDelayTime);
1.168 +});
1.169 +
1.170 +</script>
1.171 +</pre>
1.172 +</body>
1.173 +</html>
