| <!DOCTYPE html> |
| <html> |
| <head> |
| <title> |
| note-grain-on-play.html |
| </title> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/webaudio/resources/audit-util.js"></script> |
| <script src="/webaudio/resources/audit.js"></script> |
| <script src="/webaudio/resources/note-grain-on-testing.js"></script> |
| </head> |
| <body> |
| <div id="description"></div> |
| <div id="console"></div> |
| <script id="layout-test-code"> |
| let audit = Audit.createTaskRunner(); |
| |
| // To test noteGrainOn, a single ramp signal is created. |
| // Various sections of the ramp are rendered by noteGrainOn() at |
| // different times, and we verify that the actual output |
| // consists of the correct section of the ramp at the correct |
| // time. |
| |
| let linearRampBuffer; |
| |
| // Array of the grain offset used for each ramp played. |
| let grainOffsetTime = []; |
| |
| // Verify the received signal is a ramp from the correct section |
| // of our ramp signal. |
| function verifyGrain(renderedData, startFrame, endFrame, grainIndex) { |
| let grainOffsetFrame = |
| timeToSampleFrame(grainOffsetTime[grainIndex], sampleRate); |
| let grainFrameLength = endFrame - startFrame; |
| let ramp = linearRampBuffer.getChannelData(0); |
| let isCorrect = true; |
| |
| let expected; |
| let actual; |
| let frame; |
| |
| for (let k = 0; k < grainFrameLength; ++k) { |
| if (renderedData[startFrame + k] != ramp[grainOffsetFrame + k]) { |
| expected = ramp[grainOffsetFrame + k]; |
| actual = renderedData[startFrame + k]; |
| frame = startFrame + k; |
| isCorrect = false; |
| break; |
| } |
| } |
| return { |
| verified: isCorrect, |
| expected: expected, |
| actual: actual, |
| frame: frame |
| }; |
| } |
| |
| function checkResult(buffer, should) { |
| renderedData = buffer.getChannelData(0); |
| let nSamples = renderedData.length; |
| |
| // Number of grains that we found that have incorrect data. |
| let invalidGrainDataCount = 0; |
| |
| let startEndFrames = findStartAndEndSamples(renderedData); |
| |
| // Verify the start and stop times. Not strictly needed for |
| // this test, but it's useful to know that if the ramp data |
| // appears to be incorrect. |
| verifyStartAndEndFrames(startEndFrames, should); |
| |
| // Loop through each of the rendered grains and check that |
| // each grain contains our expected ramp. |
| for (let k = 0; k < startEndFrames.start.length; ++k) { |
| // Verify that the rendered data matches the expected |
| // section of our ramp signal. |
| let result = verifyGrain( |
| renderedData, startEndFrames.start[k], startEndFrames.end[k], k); |
| should(result.verified, 'Pulse ' + k + ' contained the expected data') |
| .beTrue(); |
| } |
| should( |
| invalidGrainDataCount, |
| 'Number of grains that did not contain the expected data') |
| .beEqualTo(0); |
| } |
| |
| audit.define( |
| { |
| label: 'note-grain-on-play', |
| description: 'Test noteGrainOn offset rendering' |
| }, |
| function(task, should) { |
| // Create offline audio context. |
| context = |
| new OfflineAudioContext(2, sampleRate * renderTime, sampleRate); |
| |
| // Create a linear ramp for testing noteGrainOn. |
| linearRampBuffer = createSignalBuffer(context, function(k) { |
| // Want the ramp to start |
| // with 1, not 0. |
| return k + 1; |
| }); |
| |
| let grainInfo = |
| playAllGrains(context, linearRampBuffer, numberOfTests); |
| |
| grainOffsetTime = grainInfo.grainOffsetTimes; |
| |
| context.startRendering().then(function(audioBuffer) { |
| checkResult(audioBuffer, should); |
| task.done(); |
| }); |
| }); |
| |
| audit.run(); |
| </script> |
| </body> |
| </html> |
