content/media/webaudio/test/test_waveShaper.html@44a2da4a2ab2 (annotated)
content/media/webaudio/test/test_waveShaper.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 WaveShaperNode with no curve</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 | var gTest = { |
| michael@0 | 14 | length: 4096, |
| michael@0 | 15 | numberOfChannels: 1, |
| michael@0 | 16 | createGraph: function(context) { |
| michael@0 | 17 | var source = context.createBufferSource(); |
| michael@0 | 18 | source.buffer = this.buffer; |
| michael@0 | 19 | |
| michael@0 | 20 | var shaper = context.createWaveShaper(); |
| michael@0 | 21 | shaper.curve = this.curve; |
| michael@0 | 22 | |
| michael@0 | 23 | source.connect(shaper); |
| michael@0 | 24 | |
| michael@0 | 25 | source.start(0); |
| michael@0 | 26 | return shaper; |
| michael@0 | 27 | }, |
| michael@0 | 28 | createExpectedBuffers: function(context) { |
| michael@0 | 29 | this.buffer = context.createBuffer(1, 4096, context.sampleRate); |
| michael@0 | 30 | for (var i = 1; i < 4095; ++i) { |
| michael@0 | 31 | this.buffer.getChannelData(0)[i] = 2 * (i / 4096) - 1; |
| michael@0 | 32 | } |
| michael@0 | 33 | // Two out of range values |
| michael@0 | 34 | this.buffer.getChannelData(0)[0] = -2; |
| michael@0 | 35 | this.buffer.getChannelData(0)[4095] = 2; |
| michael@0 | 36 | |
| michael@0 | 37 | this.curve = new Float32Array(2048); |
| michael@0 | 38 | for (var i = 0; i < 2048; ++i) { |
| michael@0 | 39 | this.curve[i] = Math.sin(100 * Math.PI * (i + 1) / context.sampleRate); |
| michael@0 | 40 | } |
| michael@0 | 41 | |
| michael@0 | 42 | var expectedBuffer = context.createBuffer(1, 4096, context.sampleRate); |
| michael@0 | 43 | for (var i = 1; i < 4095; ++i) { |
| michael@0 | 44 | var input = this.buffer.getChannelData(0)[i]; |
| michael@0 | 45 | var index = Math.floor(this.curve.length * (input + 1) / 2); |
| michael@0 | 46 | index = Math.max(0, Math.min(this.curve.length - 1, index)); |
| michael@0 | 47 | expectedBuffer.getChannelData(0)[i] = this.curve[index]; |
| michael@0 | 48 | } |
| michael@0 | 49 | expectedBuffer.getChannelData(0)[0] = this.curve[0]; |
| michael@0 | 50 | expectedBuffer.getChannelData(0)[4095] = this.curve[2047]; |
| michael@0 | 51 | return expectedBuffer; |
| michael@0 | 52 | }, |
| michael@0 | 53 | }; |
| michael@0 | 54 | |
| michael@0 | 55 | runTest(); |
| michael@0 | 56 | |
| michael@0 | 57 | </script> |
| michael@0 | 58 | </pre> |
| michael@0 | 59 | </body> |
| michael@0 | 60 | </html> |
