| <!DOCTYPE html> |
| <html> |
| <head> |
| <title>Test Panner Azimuth Calculation</title> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="../../resources/audit.js"></script> |
| </head> |
| |
| <body> |
| <script> |
| const audit = Audit.createTaskRunner(); |
| |
| // Fairly arbitrary sample rate |
| const sampleRate = 16000; |
| |
| audit.define('Azimuth calculation', (task, should) => { |
| // Two channels for the context so we can see each channel of the |
| // panner node. |
| let context = new OfflineAudioContext(2, sampleRate, sampleRate); |
| |
| let src = new ConstantSourceNode(context); |
| let panner = new PannerNode(context); |
| |
| src.connect(panner).connect(context.destination); |
| |
| // The source is still pointed directly at the listener, but is now |
| // directly above. The audio should be the same in both the left and |
| // right channels. |
| panner.positionY.value = 1; |
| |
| src.start(); |
| |
| context.startRendering() |
| .then(audioBuffer => { |
| // The left and right channels should contain the same signal. |
| let c0 = audioBuffer.getChannelData(0); |
| let c1 = audioBuffer.getChannelData(1); |
| |
| let expected = Math.fround(Math.SQRT1_2); |
| |
| should(c0, 'Left channel').beConstantValueOf(expected); |
| should(c1, 'Righteft channel').beConstantValueOf(expected); |
| }) |
| .then(() => task.done()); |
| }); |
| |
| audit.run(); |
| </script> |
| </body> |
| </html> |
