content/media/webaudio/test/test_periodicWave.html@6474c204b198 (annotated)
content/media/webaudio/test/test_periodicWave.html
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | <!DOCTYPE HTML> |
| michael@0 | 2 | <html> |
| michael@0 | 3 | <head> |
| michael@0 | 4 | <title>Test the PeriodicWave interface</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 | // real and imag are used in separate PeriodicWaves to make their peak values |
| michael@0 | 16 | // easy to determine. |
| michael@0 | 17 | const realMax = 99; |
| michael@0 | 18 | var real = new Float32Array(realMax + 1); |
| michael@0 | 19 | real[1] = 2.0; // fundamental |
| michael@0 | 20 | real[realMax] = 3.0; |
| michael@0 | 21 | const realPeak = real[1] + real[realMax]; |
| michael@0 | 22 | const realFundamental = 19.0; |
| michael@0 | 23 | var imag = new Float32Array(4); |
| michael@0 | 24 | imag[0] = 6.0; // should be ignored. |
| michael@0 | 25 | imag[3] = 0.5; |
| michael@0 | 26 | const imagPeak = imag[3]; |
| michael@0 | 27 | const imagFundamental = 551.0; |
| michael@0 | 28 | |
| michael@0 | 29 | const testLength = 4096; |
| michael@0 | 30 | |
| michael@0 | 31 | addLoadEvent(function() { |
| michael@0 | 32 | var ac = new AudioContext(); |
| michael@0 | 33 | ac.createPeriodicWave(new Float32Array(4096), new Float32Array(4096)); |
| michael@0 | 34 | expectException(function() { |
| michael@0 | 35 | ac.createPeriodicWave(new Float32Array(512), imag); |
| michael@0 | 36 | }, DOMException.NOT_SUPPORTED_ERR); |
| michael@0 | 37 | expectException(function() { |
| michael@0 | 38 | ac.createPeriodicWave(new Float32Array(0), new Float32Array(0)); |
| michael@0 | 39 | }, DOMException.NOT_SUPPORTED_ERR); |
| michael@0 | 40 | expectException(function() { |
| michael@0 | 41 | ac.createPeriodicWave(new Float32Array(4097), new Float32Array(4097)); |
| michael@0 | 42 | }, DOMException.NOT_SUPPORTED_ERR); |
| michael@0 | 43 | |
| michael@0 | 44 | runTest(); |
| michael@0 | 45 | }); |
| michael@0 | 46 | |
| michael@0 | 47 | var gTest = { |
| michael@0 | 48 | createGraph: function(context) { |
| michael@0 | 49 | var merger = context.createChannelMerger(); |
| michael@0 | 50 | |
| michael@0 | 51 | var osc0 = context.createOscillator(); |
| michael@0 | 52 | var osc1 = context.createOscillator(); |
| michael@0 | 53 | |
| michael@0 | 54 | osc0.setPeriodicWave(context. |
| michael@0 | 55 | createPeriodicWave(real, |
| michael@0 | 56 | new Float32Array(real.length))); |
| michael@0 | 57 | osc1.setPeriodicWave(context. |
| michael@0 | 58 | createPeriodicWave(new Float32Array(imag.length), |
| michael@0 | 59 | imag)); |
| michael@0 | 60 | |
| michael@0 | 61 | osc0.frequency.value = realFundamental; |
| michael@0 | 62 | osc1.frequency.value = imagFundamental; |
| michael@0 | 63 | |
| michael@0 | 64 | osc0.start(); |
| michael@0 | 65 | osc1.start(); |
| michael@0 | 66 | |
| michael@0 | 67 | osc0.connect(merger, 0, 0); |
| michael@0 | 68 | osc1.connect(merger, 0, 1); |
| michael@0 | 69 | |
| michael@0 | 70 | return merger; |
| michael@0 | 71 | }, |
| michael@0 | 72 | createExpectedBuffers: function(context) { |
| michael@0 | 73 | var buffer = context.createBuffer(2, testLength, context.sampleRate); |
| michael@0 | 74 | |
| michael@0 | 75 | for (var i = 0; i < buffer.length; ++i) { |
| michael@0 | 76 | |
| michael@0 | 77 | buffer.getChannelData(0)[i] = 1.0 / realPeak * |
| michael@0 | 78 | (real[1] * Math.cos(2 * Math.PI * realFundamental * i / |
| michael@0 | 79 | context.sampleRate) + |
| michael@0 | 80 | real[realMax] * Math.cos(2 * Math.PI * realMax * realFundamental * i / |
| michael@0 | 81 | context.sampleRate)); |
| michael@0 | 82 | |
| michael@0 | 83 | buffer.getChannelData(1)[i] = 1.0 / imagPeak * |
| michael@0 | 84 | imag[3] * Math.sin(2 * Math.PI * 3 * imagFundamental * i / |
| michael@0 | 85 | context.sampleRate); |
| michael@0 | 86 | } |
| michael@0 | 87 | return buffer; |
| michael@0 | 88 | }, |
| michael@0 | 89 | }; |
| michael@0 | 90 | |
| michael@0 | 91 | </script> |
| michael@0 | 92 | </pre> |
| michael@0 | 93 | </body> |
| michael@0 | 94 | </html> |
