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content/media/webaudio/test/test_delayNodeCycles.html
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| 1 <!DOCTYPE HTML> | |
| 2 <html> | |
| 3 <head> | |
| 4 <title>Test the support of cycles.</title> | |
| 5 <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script> | |
| 6 <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" /> | |
| 7 </head> | |
| 8 <body> | |
| 9 <pre id="test"> | |
| 10 <script src="webaudio.js" type="text/javascript"></script> | |
| 11 <script class="testbody" type="text/javascript"> | |
| 12 | |
| 13 SimpleTest.waitForExplicitFinish(); | |
| 14 | |
| 15 addLoadEvent(function() { | |
| 16 function getSineBuffer(ctx) { | |
| 17 var buffer = ctx.createBuffer(1, 2048, ctx.sampleRate); | |
| 18 var b = buffer.getChannelData(0); | |
| 19 for (var i = 0; i < 2048; i++) { | |
| 20 b[i] = Math.sin(440 * 2 * Math.PI * i / ctx.sampleRate); | |
| 21 } | |
| 22 return buffer; | |
| 23 } | |
| 24 | |
| 25 function createAndPlayWithCycleAndDelayNode(ctx) { | |
| 26 var source = ctx.createBufferSource(); | |
| 27 source.loop = true; | |
| 28 source.buffer = getSineBuffer(ctx); | |
| 29 | |
| 30 var gain = ctx.createGain(); | |
| 31 var delay = ctx.createDelay(); | |
| 32 delay.delayTime = 0.5; | |
| 33 | |
| 34 source.connect(gain); | |
| 35 gain.connect(delay); | |
| 36 delay.connect(ctx.destination); | |
| 37 // cycle | |
| 38 delay.connect(gain); | |
| 39 | |
| 40 source.start(0); | |
| 41 } | |
| 42 | |
| 43 function createAndPlayWithCycleAndDelayNodeButNullDelayTime(ctx) { | |
| 44 var source = ctx.createBufferSource(); | |
| 45 source.loop = true; | |
| 46 source.buffer = getSineBuffer(ctx); | |
| 47 | |
| 48 var gain = ctx.createGain(); | |
| 49 var delay = ctx.createDelay(); | |
| 50 delay.delayTime = 0.0; | |
| 51 | |
| 52 source.connect(gain); | |
| 53 gain.connect(delay); | |
| 54 delay.connect(ctx.destination); | |
| 55 // cycle | |
| 56 delay.connect(gain); | |
| 57 | |
| 58 source.start(0); | |
| 59 } | |
| 60 | |
| 61 function createAndPlayWithCycleAndNoDelayNode(ctx) { | |
| 62 var source = ctx.createBufferSource(); | |
| 63 source.loop = true; | |
| 64 source.buffer = getSineBuffer(ctx); | |
| 65 | |
| 66 var gain = ctx.createGain(); | |
| 67 var gain2 = ctx.createGain(); | |
| 68 | |
| 69 source.connect(gain); | |
| 70 gain.connect(gain2); | |
| 71 // cycle | |
| 72 gain2.connect(gain); | |
| 73 gain2.connect(ctx.destination); | |
| 74 | |
| 75 source.start(0); | |
| 76 } | |
| 77 | |
| 78 function createAndPlayWithCycleAndNoDelayNodeInCycle(ctx) { | |
| 79 var source = ctx.createBufferSource(); | |
| 80 source.loop = true; | |
| 81 source.buffer = getSineBuffer(ctx); | |
| 82 | |
| 83 var delay = ctx.createDelay(); | |
| 84 var gain = ctx.createGain(); | |
| 85 var gain2 = ctx.createGain(); | |
| 86 | |
| 87 // Their is a cycle, a delay, but the delay is not in the cycle. | |
| 88 source.connect(delay); | |
| 89 delay.connect(gain); | |
| 90 gain.connect(gain2); | |
| 91 // cycle | |
| 92 gain2.connect(gain); | |
| 93 gain2.connect(ctx.destination); | |
| 94 | |
| 95 source.start(0); | |
| 96 } | |
| 97 | |
| 98 var remainingTests = 0; | |
| 99 function finish() { | |
| 100 if (--remainingTests == 0) { | |
| 101 SimpleTest.finish(); | |
| 102 } | |
| 103 } | |
| 104 | |
| 105 function getOfflineContext(oncomplete) { | |
| 106 var ctx = new OfflineAudioContext(1, 48000, 48000); | |
| 107 ctx.oncomplete = oncomplete; | |
| 108 return ctx; | |
| 109 } | |
| 110 | |
| 111 function checkSilentBuffer(e) { | |
| 112 var buffer = e.renderedBuffer.getChannelData(0); | |
| 113 for (var i = 0; i < buffer.length; i++) { | |
| 114 if (buffer[i] != 0.0) { | |
| 115 ok(false, "buffer should be silent."); | |
| 116 finish(); | |
| 117 return; | |
| 118 } | |
| 119 } | |
| 120 ok(true, "buffer should be silent."); | |
| 121 finish(); | |
| 122 } | |
| 123 | |
| 124 function checkNoisyBuffer(e) { | |
| 125 var buffer = e.renderedBuffer.getChannelData(0); | |
| 126 for (var i = 0; i < buffer.length; i++) { | |
| 127 if (buffer[i] != 0.0) { | |
| 128 ok(true, "buffer should be noisy."); | |
| 129 finish(); | |
| 130 return true; | |
| 131 } | |
| 132 } | |
| 133 ok(false, "buffer should be noisy."); | |
| 134 finish(); | |
| 135 return false; | |
| 136 } | |
| 137 | |
| 138 function expectSilentOutput(f) { | |
| 139 remainingTests++; | |
| 140 var ctx = getOfflineContext(checkSilentBuffer); | |
| 141 f(ctx); | |
| 142 ctx.startRendering(); | |
| 143 } | |
| 144 | |
| 145 function expectNoisyOutput(f) { | |
| 146 remainingTests++; | |
| 147 var ctx = getOfflineContext(checkNoisyBuffer); | |
| 148 f(ctx); | |
| 149 ctx.startRendering(); | |
| 150 } | |
| 151 | |
| 152 // This is trying to make a graph with a cycle and no DelayNode in the graph. | |
| 153 // The cycle subgraph should be muted, in this graph the output should be silent. | |
| 154 expectSilentOutput(createAndPlayWithCycleAndNoDelayNode); | |
| 155 // This is trying to make a graph with a cycle and a DelayNode in the graph, but | |
| 156 // not part of the cycle. | |
| 157 // The cycle subgraph should be muted, in this graph the output should be silent. | |
| 158 expectSilentOutput(createAndPlayWithCycleAndNoDelayNodeInCycle); | |
| 159 // Those are making legal graphs, with at least one DelayNode in the cycle. | |
| 160 // There should be some non-silent output. | |
| 161 expectNoisyOutput(createAndPlayWithCycleAndDelayNode); | |
| 162 // DelayNode.delayTime will be clamped to 128/ctx.sampleRate. | |
| 163 // There should be some non-silent output. | |
| 164 expectNoisyOutput(createAndPlayWithCycleAndDelayNodeButNullDelayTime); | |
| 165 }); | |
| 166 | |
| 167 </script> | |
| 168 </pre> | |
| 169 </body> | |
| 170 </html> |
