test_retrospective-linearRampToValueAtTime.html (1467B)
1 <!doctype html> 2 <meta charset=utf-8> 3 <title>Test linearRampToValue with end time in the past</title> 4 <script src=/resources/testharness.js></script> 5 <script src=/resources/testharnessreport.js></script> 6 <script> 7 function do_test(t, context) { 8 var source = context.createConstantSource(); 9 source.start(); 10 11 var test = context.createGain(); 12 test.gain.linearRampToValueAtTime(0.1, 0.5*context.currentTime); 13 test.gain.linearRampToValueAtTime(0.9, 2.0); 14 15 var reference = context.createGain(); 16 reference.gain.linearRampToValueAtTime(0.1, context.currentTime); 17 reference.gain.linearRampToValueAtTime(0.9, 2.0); 18 19 source.connect(test); 20 source.connect(reference); 21 22 var merger = context.createChannelMerger(); 23 test.connect(merger, 0, 0); 24 reference.connect(merger, 0, 1); 25 26 var processor = context.createScriptProcessor(0, 2, 0); 27 merger.connect(processor); 28 processor.onaudioprocess = 29 t.step_func_done((e) => { 30 source.stop(); 31 processor.onaudioprocess = null; 32 33 var testValue = e.inputBuffer.getChannelData(0)[0]; 34 var referenceValue = e.inputBuffer.getChannelData(1)[0]; 35 36 assert_equals(testValue, referenceValue, 37 "value matches expected"); 38 }); 39 } 40 41 async_test(function(t) { 42 var context = new AudioContext; 43 (function waitForTimeAdvance() { 44 if (context.currentTime == 0) { 45 t.step_timeout(waitForTimeAdvance, 0); 46 } else { 47 do_test(t, context); 48 } 49 })(); 50 }); 51 </script>