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| 1 <!DOCTYPE html> | |
| 2 | |
| 3 <!-- | |
| 4 Tests that multiple audio-rate signals (AudioNode outputs) can be connected to a
n AudioParam | |
| 5 and that these signals are summed, along with the AudioParams intrinsic value. | |
| 6 --> | |
| 7 | |
| 8 <html> | |
| 9 <head> | |
| 10 <script src="../resources/js-test.js"></script> | |
| 11 <script src="resources/compatibility.js"></script> | |
| 12 <script src="resources/audit-util.js"></script> | |
| 13 <script src="resources/audio-testing.js"></script> | |
| 14 <script src="resources/mix-testing.js"></script> | |
| 15 | |
| 16 </head> | |
| 17 <body> | |
| 18 | |
| 19 <script> | |
| 20 | |
| 21 var sampleRate = 44100.0; | |
| 22 var lengthInSeconds = 1; | |
| 23 | |
| 24 var context = 0; | |
| 25 | |
| 26 // Buffers used by the two gain controlling sources. | |
| 27 var linearRampBuffer; | |
| 28 var toneBuffer; | |
| 29 var toneFrequency = 440; | |
| 30 | |
| 31 // Arbitrary non-zero value. | |
| 32 var baselineGain = 5; | |
| 33 | |
| 34 // Allow for a small round-off error. | |
| 35 var maxAllowedError = 1e-6; | |
| 36 | |
| 37 function checkResult(event) { | |
| 38 var renderedBuffer = event.renderedBuffer; | |
| 39 var renderedData = renderedBuffer.getChannelData(0); | |
| 40 | |
| 41 // Get buffer data from the two sources used to control gain. | |
| 42 var linearRampData = linearRampBuffer.getChannelData(0); | |
| 43 var toneData = toneBuffer.getChannelData(0); | |
| 44 | |
| 45 var n = renderedBuffer.length; | |
| 46 | |
| 47 if (n == linearRampBuffer.length) { | |
| 48 testPassed("Rendered signal is of correct length."); | |
| 49 } else { | |
| 50 testFailed("Rendered signal is not of correct length."); | |
| 51 } | |
| 52 | |
| 53 // Check that the rendered result exactly matches the sum of the intrinsic g
ain plus the two sources used to control gain. | |
| 54 // This is because we're changing the gain of a signal having constant value
1. | |
| 55 var success = true; | |
| 56 for (var i = 0; i < n; ++i) { | |
| 57 var expectedValue = baselineGain + linearRampData[i] + toneData[i]; | |
| 58 var error = Math.abs(expectedValue - renderedData[i]); | |
| 59 | |
| 60 if (error > maxAllowedError) { | |
| 61 success = false; | |
| 62 break; | |
| 63 } | |
| 64 } | |
| 65 | |
| 66 if (success) { | |
| 67 testPassed("Rendered signal matches sum of two audio-rate gain changing
signals plus baseline gain."); | |
| 68 } else { | |
| 69 testFailed("Rendered signal differs from the sum of two audio-rate gain
changing signals plus baseline gain."); | |
| 70 } | |
| 71 | |
| 72 finishJSTest(); | |
| 73 } | |
| 74 | |
| 75 function runTest() { | |
| 76 if (window.testRunner) { | |
| 77 testRunner.dumpAsText(); | |
| 78 testRunner.waitUntilDone(); | |
| 79 } | |
| 80 | |
| 81 window.jsTestIsAsync = true; | |
| 82 | |
| 83 var sampleFrameLength = sampleRate * lengthInSeconds; | |
| 84 | |
| 85 // Create offline audio context. | |
| 86 context = new OfflineAudioContext(1, sampleFrameLength, sampleRate); | |
| 87 | |
| 88 // Create buffer used by the source which will have its gain controlled. | |
| 89 var constantOneBuffer = createConstantBuffer(context, sampleFrameLength, 1); | |
| 90 var constantSource = context.createBufferSource(); | |
| 91 constantSource.buffer = constantOneBuffer; | |
| 92 | |
| 93 // Create 1st buffer used to control gain (a linear ramp). | |
| 94 linearRampBuffer = createLinearRampBuffer(context, sampleFrameLength); | |
| 95 var gainSource1 = context.createBufferSource(); | |
| 96 gainSource1.buffer = linearRampBuffer; | |
| 97 | |
| 98 // Create 2st buffer used to control gain (a simple sine wave tone). | |
| 99 toneBuffer = createToneBuffer(context, toneFrequency, lengthInSeconds, 1); | |
| 100 var gainSource2 = context.createBufferSource(); | |
| 101 gainSource2.buffer = toneBuffer; | |
| 102 | |
| 103 // Create a gain node controlling the gain of constantSource and make the co
nnections. | |
| 104 var gainNode = context.createGain(); | |
| 105 | |
| 106 // Intrinsic baseline gain. | |
| 107 // This gain value should be summed with gainSource1 and gainSource2. | |
| 108 gainNode.gain.value = baselineGain; | |
| 109 | |
| 110 constantSource.connect(gainNode); | |
| 111 gainNode.connect(context.destination); | |
| 112 | |
| 113 // Connect two audio-rate signals to control the .gain AudioParam. | |
| 114 gainSource1.connect(gainNode.gain); | |
| 115 gainSource2.connect(gainNode.gain); | |
| 116 | |
| 117 // Start all sources at time 0. | |
| 118 constantSource.start(0); | |
| 119 gainSource1.start(0); | |
| 120 gainSource2.start(0); | |
| 121 | |
| 122 context.oncomplete = checkResult; | |
| 123 context.startRendering(); | |
| 124 } | |
| 125 | |
| 126 runTest(); | |
| 127 successfullyParsed = true; | |
| 128 | |
| 129 </script> | |
| 130 | |
| 131 </body> | |
| 132 </html> | |
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Chromium Code Reviews
Issue 2581463002:
Refactor WebAudio test directory (Closed)
