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| 1 <!doctype html> | 1 <!doctype html> |
| 2 <html> | 2 <html> |
| 3 <head> | 3 <head> |
| 4 <script src="../resources/js-test.js"></script> | 4 <script src="../resources/js-test.js"></script> |
| 5 <script src="resources/compatibility.js"></script> | 5 <script src="resources/compatibility.js"></script> |
| 6 <script src="resources/audio-testing.js"></script> | 6 <script src="resources/audio-testing.js"></script> |
| 7 <title>Test Negative AudioParam.exponentialRampToValueAtTime</title> | 7 <title>Test Negative AudioParam.exponentialRampToValueAtTime</title> |
| 8 </head> | 8 </head> |
| 9 | 9 |
| 10 <body> | 10 <body> |
| (...skipping 93 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... |
| 104 source.start(); | 104 source.start(); |
| 105 | 105 |
| 106 context.startRendering().then(function (resultBuffer) { | 106 context.startRendering().then(function (resultBuffer) { |
| 107 var actual = resultBuffer.getChannelData(0); | 107 var actual = resultBuffer.getChannelData(0); |
| 108 | 108 |
| 109 Should("Exponential ramp from -1 to 1", actual) | 109 Should("Exponential ramp from -1 to 1", actual) |
| 110 .beConstantValueOf(-1); | 110 .beConstantValueOf(-1); |
| 111 }).then(done); | 111 }).then(done); |
| 112 }); | 112 }); |
| 113 | 113 |
| 114 audit.defineTask("propagate", function (done) { |
| 115 // Test propagation of ramp if the exponential ramp start and end values
have opposite sign. |
| 116 var renderDuration = 0.125; |
| 117 var linearRampEnd = renderDuration / 4; |
| 118 var exponentialRampEnd = renderDuration / 2; |
| 119 |
| 120 var context = new OfflineAudioContext(1, renderDuration * sampleRate, sa
mpleRate); |
| 121 var source = context.createBufferSource(); |
| 122 source.buffer = createConstantBuffer(context, 1, 1); |
| 123 source.loop = true; |
| 124 |
| 125 var g = context.createGain(); |
| 126 |
| 127 g.gain.setValueAtTime(2, 0); |
| 128 g.gain.linearRampToValueAtTime(-1, linearRampEnd); |
| 129 g.gain.exponentialRampToValueAtTime(1, exponentialRampEnd); |
| 130 |
| 131 source.connect(g) |
| 132 .connect(context.destination); |
| 133 source.start(); |
| 134 |
| 135 context.startRendering().then(function (resultBuffer) { |
| 136 var actual = resultBuffer.getChannelData(0); |
| 137 |
| 138 // Since the start value of the exponential ramp is -1 and the end val
ue is 1, the ramp |
| 139 // should just propagate -1 from the end of the linear ramp "forever". |
| 140 var endFrame = Math.ceil(linearRampEnd * sampleRate); |
| 141 Should("Exponential ramp from -1 to 1 after the end of the linear ramp
", |
| 142 actual.slice(endFrame)) |
| 143 .beConstantValueOf(-1); |
| 144 }).then(done); |
| 145 |
| 146 }); |
| 147 |
| 114 audit.defineTask("finish", function (done) { | 148 audit.defineTask("finish", function (done) { |
| 115 finishJSTest(); | 149 finishJSTest(); |
| 116 done(); | 150 done(); |
| 117 }); | 151 }); |
| 118 | 152 |
| 119 audit.runTasks(); | 153 audit.runTasks(); |
| 120 </script> | 154 </script> |
| 121 </body> | 155 </body> |
| 122 </html> | 156 </html> |
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Chromium Code Reviews
Issue 1561483004:
Correctly propagate end value for exponential ramp (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master