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| 1 <!doctype html> | |
| 2 <html> | |
| 3 <head> | |
| 4 <title>Test linearRampToValue Updates the Param Value</title> | |
| 5 <script src="../resources/js-test.js"></script> | |
| 6 <script src="resources/compatibility.js"></script> | |
| 7 <script src="resources/audit-util.js"></script> | |
| 8 <script src="resources/audio-testing.js"></script> | |
| 9 </head> | |
| 10 | |
| 11 <body> | |
| 12 <script> | |
| 13 description("Test linearRampToValue Updates the Param Value"); | |
| 14 window.jsTestIsAsync = true; | |
| 15 | |
| 16 var renderQuantumSize = 128; | |
| 17 // Should be a power of two to get rid of rounding errors when converting
between time and | |
| 18 // frame. | |
| 19 var sampleRate = 4096; | |
| 20 var renderDuration = 1; | |
| 21 // End time of the linear ramp automation | |
| 22 var rampEndTime = renderDuration / 2; | |
| 23 | |
| 24 var audit = Audit.createTaskRunner(); | |
| 25 | |
| 26 // Test that linearRampToValue properly sets the AudioParam .value attribu
te when the | |
| 27 // linearRamp automation is running. | |
| 28 audit.defineTask("propagate", function (done) { | |
| 29 var context = new OfflineAudioContext(1, renderDuration * sampleRate, sa
mpleRate); | |
| 30 | |
| 31 // Create a constant source. | |
| 32 var source = context.createBufferSource(); | |
| 33 source.buffer = createConstantBuffer(context, 1, 1); | |
| 34 source.loop = true; | |
| 35 | |
| 36 // The gain node to be automated for testing. | |
| 37 var gain = context.createGain(); | |
| 38 | |
| 39 gain.gain.setValueAtTime(0, 0); | |
| 40 gain.gain.linearRampToValueAtTime(1, rampEndTime); | |
| 41 | |
| 42 // Connect up the graph | |
| 43 source.connect(gain); | |
| 44 gain.connect(context.destination); | |
| 45 | |
| 46 var success = true; | |
| 47 | |
| 48 // The number of rendering quanta that will be processed in the context.
At the beginning | |
| 49 // of each rendering quantum (except the first), we will check that gain
.gain.value has the | |
| 50 // expected value. | |
| 51 var renderLoops = Math.floor(renderDuration * sampleRate / renderQuantum
Size); | |
| 52 | |
| 53 for (var k = 1; k < renderLoops; ++k) { | |
| 54 var time = k * renderQuantumSize / sampleRate; | |
| 55 context.suspend(time).then(function () { | |
| 56 var expected = 1; | |
| 57 | |
| 58 if (context.currentTime <= rampEndTime) { | |
| 59 // The expected value of the gain is the last computed value from
the previous | |
| 60 // rendering quantum because suspend() stops at the beginning of a
rendering quantum, | |
| 61 // so we haven't computed the new value yet. | |
| 62 expected = (context.currentTime - 1 / sampleRate) / rampEndTime; | |
| 63 } | |
| 64 | |
| 65 var frame = context.currentTime * sampleRate - 1; | |
| 66 success = Should("gain.gain.value at frame " + frame, gain.gain.valu
e) | |
| 67 .beEqualTo(expected) && success; | |
| 68 }).then(context.resume.bind(context)); | |
| 69 } | |
| 70 | |
| 71 // Rock and roll! | |
| 72 source.start(); | |
| 73 context.startRendering().then(function (result) { | |
| 74 if (success) | |
| 75 testPassed("linearRampToValue properly set the AudioParam value."); | |
| 76 else | |
| 77 testFailed("linearRampToValue did not properly set the AudioParam va
lue."); | |
| 78 }).then(done); | |
| 79 }); | |
| 80 | |
| 81 audit.defineTask("finish", function (done) { | |
| 82 finishJSTest(); | |
| 83 done(); | |
| 84 }); | |
| 85 | |
| 86 audit.runTasks(); | |
| 87 </script> | |
| 88 </body> | |
| 89 </html> | |
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Chromium Code Reviews
Issue 2581463002:
Refactor WebAudio test directory (Closed)
