retrospective-linearRampToValueAtTime.html (2568B)
1 <!doctype html> 2 <meta charset=utf-8> 3 <html> 4 <head> 5 <title>Test linearRampToValue with end time in the past</title> 6 <script src="/resources/testharness.js"></script> 7 <script src="/resources/testharnessreport.js"></script> 8 <script src="/webaudio/resources/audit-util.js"></script> 9 <script src="/webaudio/resources/audit.js"></script> 10 <script src="retrospective-test.js"></script> 11 </head> 12 <body> 13 <script> 14 let audit = Audit.createTaskRunner(); 15 16 audit.define( 17 { 18 label: 'test', 19 description: 'Test linearRampToValue with end time in the past' 20 }, 21 (task, should) => { 22 let {context, source, test, reference} = setupRetrospectiveGraph(); 23 24 // Suspend the context at this frame so we can synchronously set up 25 // automations. 26 const suspendFrame = 128; 27 28 context.suspend(suspendFrame / context.sampleRate) 29 .then(() => { 30 // Call setTargetAtTime with a time in the past 31 test.gain.linearRampToValueAtTime( 32 0.1, 0.5 * context.currentTime); 33 test.gain.linearRampToValueAtTime(0.9, 1.0); 34 35 reference.gain.linearRampToValueAtTime( 36 0.1, context.currentTime); 37 reference.gain.linearRampToValueAtTime(0.9, 1.0); 38 }) 39 .then(() => context.resume()); 40 41 source.start(); 42 43 context.startRendering() 44 .then(resultBuffer => { 45 let testValue = resultBuffer.getChannelData(0); 46 let referenceValue = resultBuffer.getChannelData(1); 47 48 // Until the suspendFrame, both should be exactly equal to 1. 49 should( 50 testValue.slice(0, suspendFrame), 51 `Test[0:${suspendFrame - 1}]`) 52 .beConstantValueOf(1); 53 should( 54 referenceValue.slice(0, suspendFrame), 55 `Reference[0:${suspendFrame - 1}]`) 56 .beConstantValueOf(1); 57 58 // After the suspendFrame, both should be equal (and not 59 // constant) 60 should( 61 testValue.slice(suspendFrame), `Test[${suspendFrame}:]`) 62 .beEqualToArray(referenceValue.slice(suspendFrame)); 63 }) 64 .then(() => task.done()); 65 }); 66 67 audit.run(); 68 </script> 69 </body> 70 </html>