content/media/webaudio/test/test_delayNodeChannelChanges.html@44a2da4a2ab2 (annotated)
content/media/webaudio/test/test_delayNodeChannelChanges.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
| michael@0 | 1 | <!DOCTYPE HTML> |
| michael@0 | 2 | <html> |
| michael@0 | 3 | <head> |
| michael@0 | 4 | <title>test DelayNode channel count changes</title> |
| michael@0 | 5 | <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script> |
| michael@0 | 6 | <script type="text/javascript" src="webaudio.js"></script> |
| michael@0 | 7 | <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" /> |
| michael@0 | 8 | </head> |
| michael@0 | 9 | <body> |
| michael@0 | 10 | <pre id="test"> |
| michael@0 | 11 | <script class="testbody" type="text/javascript"> |
| michael@0 | 12 | |
| michael@0 | 13 | SimpleTest.waitForExplicitFinish(); |
| michael@0 | 14 | |
| michael@0 | 15 | const bufferSize = 4096; |
| michael@0 | 16 | |
| michael@0 | 17 | var ctx; |
| michael@0 | 18 | var testDelay; |
| michael@0 | 19 | var stereoDelay; |
| michael@0 | 20 | var invertor; |
| michael@0 | 21 | |
| michael@0 | 22 | function compareOutputs(callback) { |
| michael@0 | 23 | var processor = ctx.createScriptProcessor(bufferSize, 2, 0); |
| michael@0 | 24 | testDelay.connect(processor); |
| michael@0 | 25 | invertor.connect(processor); |
| michael@0 | 26 | processor.onaudioprocess = |
| michael@0 | 27 | function(e) { |
| michael@0 | 28 | compareBuffers(e.inputBuffer, |
| michael@0 | 29 | ctx.createBuffer(2, bufferSize, ctx.sampleRate)); |
| michael@0 | 30 | e.target.onaudioprocess = null; |
| michael@0 | 31 | callback(); |
| michael@0 | 32 | } |
| michael@0 | 33 | } |
| michael@0 | 34 | |
| michael@0 | 35 | function startTest() { |
| michael@0 | 36 | // And a two-channel signal |
| michael@0 | 37 | var merger = ctx.createChannelMerger(); |
| michael@0 | 38 | merger.connect(testDelay); |
| michael@0 | 39 | merger.connect(stereoDelay); |
| michael@0 | 40 | var oscL = ctx.createOscillator(); |
| michael@0 | 41 | oscL.connect(merger, 0, 0); |
| michael@0 | 42 | oscL.start(0); |
| michael@0 | 43 | var oscR = ctx.createOscillator(); |
| michael@0 | 44 | oscR.type = "sawtooth"; |
| michael@0 | 45 | oscR.connect(merger, 0, 1); |
| michael@0 | 46 | oscR.start(0); |
| michael@0 | 47 | |
| michael@0 | 48 | compareOutputs( |
| michael@0 | 49 | function () { |
| michael@0 | 50 | // Disconnect the two-channel signal and test again |
| michael@0 | 51 | merger.disconnect(); |
| michael@0 | 52 | compareOutputs(SimpleTest.finish); |
| michael@0 | 53 | }); |
| michael@0 | 54 | } |
| michael@0 | 55 | |
| michael@0 | 56 | function prepareTest() { |
| michael@0 | 57 | ctx = new AudioContext(); |
| michael@0 | 58 | |
| michael@0 | 59 | // The output of a test delay node with mono and stereo input will be |
| michael@0 | 60 | // compared with that of separate mono and stereo delay nodes. |
| michael@0 | 61 | const delayTime = 0.3 * bufferSize / ctx.sampleRate; |
| michael@0 | 62 | testDelay = ctx.createDelay(delayTime); |
| michael@0 | 63 | testDelay.delayTime.value = delayTime; |
| michael@0 | 64 | monoDelay = ctx.createDelay(delayTime); |
| michael@0 | 65 | monoDelay.delayTime.value = delayTime; |
| michael@0 | 66 | stereoDelay = ctx.createDelay(delayTime); |
| michael@0 | 67 | stereoDelay.delayTime.value = delayTime; |
| michael@0 | 68 | |
| michael@0 | 69 | // Create a one-channel signal and connect to the delay nodes |
| michael@0 | 70 | var monoOsc = ctx.createOscillator(); |
| michael@0 | 71 | monoOsc.frequency.value = 110; |
| michael@0 | 72 | monoOsc.connect(testDelay); |
| michael@0 | 73 | monoOsc.connect(monoDelay); |
| michael@0 | 74 | monoOsc.start(0); |
| michael@0 | 75 | |
| michael@0 | 76 | // Invert the expected so that mixing with the test will find the difference. |
| michael@0 | 77 | invertor = ctx.createGain(); |
| michael@0 | 78 | invertor.gain.value = -1.0; |
| michael@0 | 79 | monoDelay.connect(invertor); |
| michael@0 | 80 | stereoDelay.connect(invertor); |
| michael@0 | 81 | |
| michael@0 | 82 | // Start the test after the delay nodes have begun processing. |
| michael@0 | 83 | var processor = ctx.createScriptProcessor(bufferSize, 1, 0); |
| michael@0 | 84 | processor.connect(ctx.destination); |
| michael@0 | 85 | |
| michael@0 | 86 | processor.onaudioprocess = |
| michael@0 | 87 | function(e) { |
| michael@0 | 88 | e.target.onaudioprocess = null; |
| michael@0 | 89 | processor.disconnect(); |
| michael@0 | 90 | startTest(); |
| michael@0 | 91 | }; |
| michael@0 | 92 | } |
| michael@0 | 93 | prepareTest(); |
| michael@0 | 94 | </script> |
| michael@0 | 95 | </pre> |
| michael@0 | 96 | </body> |
| michael@0 | 97 | </html> |
