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| 1 <!DOCTYPE html> | 1 <!DOCTYPE html> |
| 2 | 2 |
| 3 <!-- | 3 <!-- |
| 4 Tests that an audio-rate signal (AudioNode output) can be connected to an AudioP
aram. | 4 Tests that an audio-rate signal (AudioNode output) can be connected to an |
| 5 Specifically, this tests that an audio-rate signal coming from an AudioBufferSou
rceNode | 5 AudioParam. Specifically, this tests that an audio-rate signal coming from an |
| 6 playing an AudioBuffer containing a specific curve can be connected to an AudioG
ainNode's | 6 AudioBufferSourceNode playing an AudioBuffer containing a specific curve can be |
| 7 .gain attribute (an AudioParam). Another AudioBufferSourceNode will be the audi
o source | 7 connected to an AudioGainNode's .gain attribute (an AudioParam). Another |
| 8 having its gain changed. We load this one with an AudioBuffer containing a cons
tant value of 1. | 8 AudioBufferSourceNode will be the audio source having its gain changed. We load |
| 9 Thus it's easy to check that the resultant signal should be equal to the gain-sc
aling curve. | 9 this one with an AudioBuffer containing a constant value of 1. Thus it's easy |
| 10 to check that the resultant signal should be equal to the gain-scaling curve. |
| 10 --> | 11 --> |
| 11 | 12 |
| 12 <html> | 13 <html> |
| 13 <head> | 14 <head> |
| 14 <script src="../../resources/js-test.js"></script> | 15 <script src="../../resources/testharness.js"></script> |
| 16 <script src="../../resources/testharnessreport.js"></script> |
| 15 <script src="../resources/audit-util.js"></script> | 17 <script src="../resources/audit-util.js"></script> |
| 16 <script src="../resources/audio-testing.js"></script> | 18 <script src="../resources/audit.js"></script> |
| 17 | 19 |
| 18 </head> | 20 </head> |
| 19 <body> | 21 <body> |
| 20 | 22 |
| 21 <script> | 23 <script> |
| 24 let audit = Audit.createTaskRunner(); |
| 22 | 25 |
| 23 var sampleRate = 44100.0; | 26 let sampleRate = 44100.0; |
| 24 var lengthInSeconds = 1; | 27 let lengthInSeconds = 1; |
| 25 | 28 |
| 26 var context = 0; | 29 let context = 0; |
| 27 var constantOneBuffer = 0; | 30 let constantOneBuffer = 0; |
| 28 var linearRampBuffer = 0; | 31 let linearRampBuffer = 0; |
| 29 | 32 |
| 30 function checkResult(event) { | 33 function checkResult(renderedBuffer, should) { |
| 31 var renderedBuffer = event.renderedBuffer; | 34 let renderedData = renderedBuffer.getChannelData(0); |
| 32 var renderedData = renderedBuffer.getChannelData(0); | 35 let expectedData = linearRampBuffer.getChannelData(0); |
| 33 var expectedData = linearRampBuffer.getChannelData(0); | 36 let n = renderedBuffer.length; |
| 34 var n = renderedBuffer.length; | |
| 35 | 37 |
| 36 if (n == linearRampBuffer.length) { | 38 should(n, 'Rendered signal length').beEqualTo(linearRampBuffer.length); |
| 37 testPassed("Rendered signal is of correct length."); | 39 |
| 38 } else { | 40 // Check that the rendered result exactly matches the buffer used to control |
| 39 testFailed("Rendered signal is not of correct length."); | 41 // gain. This is because we're changing the gain of a signal having constant |
| 42 // value 1. |
| 43 let success = true; |
| 44 for (let i = 0; i < n; ++i) { |
| 45 if (renderedData[i] != expectedData[i]) { |
| 46 success = false; |
| 47 break; |
| 40 } | 48 } |
| 49 } |
| 41 | 50 |
| 42 // Check that the rendered result exactly matches the buffer used to control
gain. | 51 should( |
| 43 // This is because we're changing the gain of a signal having constant value
1. | 52 success, |
| 44 var success = true; | 53 'Rendered signal exactly matches the audio-rate gain changing signal') |
| 45 for (var i = 0; i < n; ++i) { | 54 .beTrue(); |
| 46 if (renderedData[i] != expectedData[i]) { | |
| 47 success = false; | |
| 48 break; | |
| 49 } | |
| 50 } | |
| 51 | |
| 52 if (success) { | |
| 53 testPassed("Rendered signal exactly matches the audio-rate gain changing
signal."); | |
| 54 } else { | |
| 55 testFailed("Rendered signal differs from the audio-rate gain changing si
gnal."); | |
| 56 } | |
| 57 | |
| 58 finishJSTest(); | |
| 59 } | 55 } |
| 60 | 56 |
| 61 function runTest() { | 57 audit.define('test', function(task, should) { |
| 62 if (window.testRunner) { | 58 let sampleFrameLength = sampleRate * lengthInSeconds; |
| 63 testRunner.dumpAsText(); | |
| 64 testRunner.waitUntilDone(); | |
| 65 } | |
| 66 | 59 |
| 67 window.jsTestIsAsync = true; | 60 // Create offline audio context. |
| 61 context = new OfflineAudioContext(1, sampleFrameLength, sampleRate); |
| 68 | 62 |
| 69 var sampleFrameLength = sampleRate * lengthInSeconds; | 63 // Create buffer used by the source which will have its gain controlled. |
| 64 constantOneBuffer = createConstantBuffer(context, sampleFrameLength, 1); |
| 70 | 65 |
| 71 // Create offline audio context. | 66 // Create buffer used to control gain. |
| 72 context = new OfflineAudioContext(1, sampleFrameLength, sampleRate); | 67 linearRampBuffer = createLinearRampBuffer(context, sampleFrameLength); |
| 73 | 68 |
| 74 // Create buffer used by the source which will have its gain controlled. | 69 // Create the two sources. |
| 75 constantOneBuffer = createConstantBuffer(context, sampleFrameLength, 1); | |
| 76 | 70 |
| 77 // Create buffer used to control gain. | 71 let constantSource = context.createBufferSource(); |
| 78 linearRampBuffer = createLinearRampBuffer(context, sampleFrameLength); | 72 constantSource.buffer = constantOneBuffer; |
| 79 | 73 |
| 80 // Create the two sources. | 74 let gainChangingSource = context.createBufferSource(); |
| 75 gainChangingSource.buffer = linearRampBuffer; |
| 81 | 76 |
| 82 var constantSource = context.createBufferSource(); | 77 // Create a gain node controlling the gain of constantSource and make the |
| 83 constantSource.buffer = constantOneBuffer; | 78 // connections. |
| 79 let gainNode = context.createGain(); |
| 84 | 80 |
| 85 var gainChangingSource = context.createBufferSource(); | 81 // Intrinsic baseline gain of zero. |
| 86 gainChangingSource.buffer = linearRampBuffer; | 82 gainNode.gain.value = 0; |
| 87 | 83 |
| 88 // Create a gain node controlling the gain of constantSource and make the co
nnections. | 84 constantSource.connect(gainNode); |
| 89 var gainNode = context.createGain(); | 85 gainNode.connect(context.destination); |
| 90 | 86 |
| 91 // Intrinsic baseline gain of zero. | 87 // Connect an audio-rate signal to control the .gain AudioParam. |
| 92 gainNode.gain.value = 0; | 88 // This is the heart of what is being tested. |
| 89 gainChangingSource.connect(gainNode.gain); |
| 93 | 90 |
| 94 constantSource.connect(gainNode); | 91 // Start both sources at time 0. |
| 95 gainNode.connect(context.destination); | 92 constantSource.start(0); |
| 93 gainChangingSource.start(0); |
| 96 | 94 |
| 97 // Connect an audio-rate signal to control the .gain AudioParam. | 95 context.startRendering().then(buffer => { |
| 98 // This is the heart of what is being tested. | 96 checkResult(buffer, should); |
| 99 gainChangingSource.connect(gainNode.gain); | 97 task.done(); |
| 98 }); |
| 99 }); |
| 100 | 100 |
| 101 // Start both sources at time 0. | 101 audit.run(); |
| 102 constantSource.start(0); | |
| 103 gainChangingSource.start(0); | |
| 104 | |
| 105 context.oncomplete = checkResult; | |
| 106 context.startRendering(); | |
| 107 } | |
| 108 | |
| 109 runTest(); | |
| 110 successfullyParsed = true; | |
| 111 | 102 |
| 112 </script> | 103 </script> |
| 113 | 104 |
| 114 </body> | 105 </body> |
| 115 </html> | 106 </html> |
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Chromium Code Reviews
Issue 2651253004:
Convert non-Audit AudioParam tests to testharness (Closed)
