| <!DOCTYPE html> |
| <html> |
| <head> |
| <meta charset="utf-8"> |
| <title>Test AnalyserNode when the input is silent</title> |
| <meta name="timeout" content="long"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script> |
| setup({ single_test: true }); |
| var ac = new AudioContext(); |
| var analyser = ac.createAnalyser(); |
| var constant = ac.createConstantSource(); |
| var sp = ac.createScriptProcessor(2048, 1, 1); |
| |
| constant.offset.value = 0.0; |
| |
| constant.connect(analyser).connect(ac.destination); |
| |
| constant.connect(sp).connect(ac.destination); |
| |
| var buf = new Float32Array(analyser.frequencyBinCount); |
| var iteration_count = 10; |
| sp.onaudioprocess = function() { |
| analyser.getFloatFrequencyData(buf); |
| var correct = true; |
| for (var i = 0; i < buf.length; i++) { |
| correct &= buf[i] == -Infinity; |
| } |
| assert_true(!!correct, "silent input process -Infinity in decibel bins"); |
| if (!iteration_count--) { |
| sp.onaudioprocess = null; |
| constant.stop(); |
| ac.close(); |
| done(); |
| } |
| }; |
| |
| constant.start(); |
| </script> |
| </head> |
| </body> |
| </html> |
