The Tor Browser: content/media/webaudio/test/test_delayNodeCycles.html@44a2da4a2ab2 (annotated)

content/media/webaudio/test/test_delayNodeCycles.html@44a2da4a2ab2 (annotated)

content/media/webaudio/test/test_delayNodeCycles.html

Fri, 16 Jan 2015 04:50:19 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Fri, 16 Jan 2015 04:50:19 +0100
branch: TOR_BUG_9701
changeset 13: 44a2da4a2ab2
permissions: -rw-r--r--

Replace accessor implementation with direct member state manipulation, by
request https://trac.torproject.org/projects/tor/ticket/9701#comment:32

 <!DOCTYPE HTML>
 <html>
 <head>
   <title>Test the support of cycles.</title>
   <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
   <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
 </head>
 <body>
 <pre id="test">
 <script src="webaudio.js" type="text/javascript"></script>
 <script class="testbody" type="text/javascript">
 SimpleTest.waitForExplicitFinish();
 addLoadEvent(function() {
   function getSineBuffer(ctx) {
     var buffer = ctx.createBuffer(1, 2048, ctx.sampleRate);
     var b = buffer.getChannelData(0);
     for (var i = 0; i < 2048; i++) {
       b[i] = Math.sin(440 * 2 * Math.PI * i / ctx.sampleRate);
     }
     return buffer;
   }
   function createAndPlayWithCycleAndDelayNode(ctx) {
     var source = ctx.createBufferSource();
     source.loop = true;
     source.buffer = getSineBuffer(ctx);
     var gain = ctx.createGain();
     var delay = ctx.createDelay();
     delay.delayTime = 0.5;
     source.connect(gain);
     gain.connect(delay);
     delay.connect(ctx.destination);
     // cycle
     delay.connect(gain);
     source.start(0);
   }
   function createAndPlayWithCycleAndDelayNodeButNullDelayTime(ctx) {
     var source = ctx.createBufferSource();
     source.loop = true;
     source.buffer = getSineBuffer(ctx);
     var gain = ctx.createGain();
     var delay = ctx.createDelay();
     delay.delayTime = 0.0;
     source.connect(gain);
     gain.connect(delay);
     delay.connect(ctx.destination);
     // cycle
     delay.connect(gain);
     source.start(0);
   }
   function createAndPlayWithCycleAndNoDelayNode(ctx) {
     var source = ctx.createBufferSource();
     source.loop = true;
     source.buffer = getSineBuffer(ctx);
     var gain = ctx.createGain();
     var gain2 = ctx.createGain();
     source.connect(gain);
     gain.connect(gain2);
     // cycle
     gain2.connect(gain);
     gain2.connect(ctx.destination);
     source.start(0);
   }
   function createAndPlayWithCycleAndNoDelayNodeInCycle(ctx) {
     var source = ctx.createBufferSource();
     source.loop = true;
     source.buffer = getSineBuffer(ctx);
     var delay = ctx.createDelay();
     var gain = ctx.createGain();
     var gain2 = ctx.createGain();
     // Their is a cycle, a delay, but the delay is not in the cycle.
     source.connect(delay);
     delay.connect(gain);
     gain.connect(gain2);
     // cycle
     gain2.connect(gain);
     gain2.connect(ctx.destination);
     source.start(0);
   }
   var remainingTests = 0;
   function finish() {
     if (--remainingTests == 0) {
       SimpleTest.finish();
     }
   }
   function getOfflineContext(oncomplete) {
     var ctx = new OfflineAudioContext(1, 48000, 48000);
     ctx.oncomplete = oncomplete;
     return ctx;
   }
   function checkSilentBuffer(e) {
     var buffer = e.renderedBuffer.getChannelData(0);
     for (var i = 0; i < buffer.length; i++) {
       if (buffer[i] != 0.0) {
         ok(false, "buffer should be silent.");
         finish();
         return;
       }
     }
     ok(true, "buffer should be silent.");
     finish();
   }
   function checkNoisyBuffer(e) {
     var buffer = e.renderedBuffer.getChannelData(0);
     for (var i = 0; i < buffer.length; i++) {
       if (buffer[i] != 0.0) {
         ok(true, "buffer should be noisy.");
         finish();
         return true;
       }
     }
     ok(false, "buffer should be noisy.");
     finish();
     return false;
   }
   function expectSilentOutput(f) {
     remainingTests++;
     var ctx = getOfflineContext(checkSilentBuffer);
     f(ctx);
     ctx.startRendering();
   }
   function expectNoisyOutput(f) {
     remainingTests++;
     var ctx = getOfflineContext(checkNoisyBuffer);
     f(ctx);
     ctx.startRendering();
   }
   // This is trying to make a graph with a cycle and no DelayNode in the graph.
   // The cycle subgraph should be muted, in this graph the output should be silent.
   expectSilentOutput(createAndPlayWithCycleAndNoDelayNode);
   // This is trying to make a graph with a cycle and a DelayNode in the graph, but
   // not part of the cycle.
   // The cycle subgraph should be muted, in this graph the output should be silent.
   expectSilentOutput(createAndPlayWithCycleAndNoDelayNodeInCycle);
   // Those are making legal graphs, with at least one DelayNode in the cycle.
   // There should be some non-silent output.
   expectNoisyOutput(createAndPlayWithCycleAndDelayNode);
   // DelayNode.delayTime will be clamped to 128/ctx.sampleRate.
   // There should be some non-silent output.
   expectNoisyOutput(createAndPlayWithCycleAndDelayNodeButNullDelayTime);
 });
 </script>
 </pre>
 </body>
 </html>

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