content/media/webaudio/test/test_bug964376.html@44a2da4a2ab2 (annotated)
content/media/webaudio/test/test_bug964376.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 repeating audio is not distorted</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 | function gcd(a, b) { |
| michael@0 | 14 | if (b === 0) { |
| michael@0 | 15 | return a; |
| michael@0 | 16 | } |
| michael@0 | 17 | return gcd(b, a % b); |
| michael@0 | 18 | } |
| michael@0 | 19 | |
| michael@0 | 20 | var SAMPLE_PLACEMENT = 128; |
| michael@0 | 21 | |
| michael@0 | 22 | var gTest = { |
| michael@0 | 23 | length: 2048, |
| michael@0 | 24 | numberOfChannels: 1, |
| michael@0 | 25 | |
| michael@0 | 26 | createGraph: function(context) { |
| michael@0 | 27 | var freq = Math.round(context.sampleRate / SAMPLE_PLACEMENT); |
| michael@0 | 28 | var dur = context.sampleRate / gcd(freq, context.sampleRate); |
| michael@0 | 29 | var buffer = context.createBuffer(1, dur, context.sampleRate); |
| michael@0 | 30 | |
| michael@0 | 31 | for (var i = 0; i < context.sampleRate; ++i) { |
| michael@0 | 32 | buffer.getChannelData(0)[i] = Math.sin(freq * 2 * Math.PI * i / context.sampleRate); |
| michael@0 | 33 | } |
| michael@0 | 34 | |
| michael@0 | 35 | var source = context.createBufferSource(); |
| michael@0 | 36 | source.buffer = buffer; |
| michael@0 | 37 | source.loop = true; |
| michael@0 | 38 | source.playbackRate.setValueAtTime(0.5, SAMPLE_PLACEMENT / context.sampleRate); |
| michael@0 | 39 | source.start(0); |
| michael@0 | 40 | |
| michael@0 | 41 | return source; |
| michael@0 | 42 | }, |
| michael@0 | 43 | |
| michael@0 | 44 | createExpectedBuffers: function(context) { |
| michael@0 | 45 | var freq = Math.round(context.sampleRate / SAMPLE_PLACEMENT); |
| michael@0 | 46 | var expectedBuffer = context.createBuffer(1, 2048, context.sampleRate); |
| michael@0 | 47 | var c = expectedBuffer.getChannelData(0); |
| michael@0 | 48 | for (var i = 0; i < c.length; ++i) { |
| michael@0 | 49 | if (i < SAMPLE_PLACEMENT) { |
| michael@0 | 50 | c[i] = Math.sin(freq * 2 * Math.PI * i / context.sampleRate); |
| michael@0 | 51 | } else { |
| michael@0 | 52 | c[i] = Math.sin(freq / 2 * 2 * Math.PI * (i + SAMPLE_PLACEMENT) / context.sampleRate); |
| michael@0 | 53 | } |
| michael@0 | 54 | } |
| michael@0 | 55 | |
| michael@0 | 56 | return expectedBuffer; |
| michael@0 | 57 | }, |
| michael@0 | 58 | }; |
| michael@0 | 59 | |
| michael@0 | 60 | runTest(); |
| michael@0 | 61 | </script> |
| michael@0 | 62 | </pre> |
| michael@0 | 63 | </body> |
| michael@0 | 64 | </html> |
