| <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> |
| <html> |
| <head> |
| <script src="resources/audio-testing.js"></script> |
| <script src="resources/note-grain-on-testing.js"></script> |
| <script src="../resources/js-test-pre.js"></script> |
| </head> |
| |
| <body> |
| <div id="description"></div> |
| <div id="console"></div> |
| |
| <script> |
| description("Test noteGrainOn offset rendering."); |
| |
| // 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. |
| |
| var linearRampBuffer; |
| |
| // Array of the grain offset used for each ramp played. |
| var grainOffsetTime = []; |
| |
| // Verify the received signal is a ramp from the correct section |
| // of our ramp signal. |
| function verifyGrain(renderedData, startFrame, endFrame, grainIndex) { |
| var grainOffsetFrame = timeToSampleFrame(grainOffsetTime[grainIndex], sampleRate); |
| var grainFrameLength = endFrame - startFrame; |
| var ramp = linearRampBuffer.getChannelData(0); |
| var isCorrect = true; |
| |
| var expected; |
| var actual; |
| var frame; |
| |
| for (var 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(event) { |
| var buffer = event.renderedBuffer; |
| renderedData = buffer.getChannelData(0); |
| var nSamples = renderedData.length; |
| |
| var success = true; |
| |
| // Number of grains that we found that have incorrect data. |
| var invalidGrainDataCount = 0; |
| |
| var 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. |
| success = success && verifyStartAndEndFrames(startEndFrames); |
| |
| // Loop through each of the rendered grains and check that |
| // each grain contains our expected ramp. |
| for (var k = 0; k < startEndFrames.start.length; ++k) { |
| // Verify that the rendered data matches the expected |
| // section of our ramp signal. |
| var result = verifyGrain(renderedData, startEndFrames.start[k], startEndFrames.end[k], k); |
| |
| if (!result.verified) { |
| testFailed("Grain " + k + " incorrect. Expected " + result.expected + " but received " + result.actual + " at sample frame " + result.frame); |
| ++invalidGrainDataCount; |
| success = false; |
| } |
| } |
| |
| if (!invalidGrainDataCount) { |
| testPassed("All " + numberOfTests + " grains contained the correct data."); |
| } else { |
| testFailed(invalidGrainDataCount + " grains out of " + numberOfTests + " did not contain the expected data."); |
| success = false; |
| } |
| |
| if (success) { |
| testPassed("noteGrainOn offset rendering tests passed."); |
| } else { |
| testFailed("noteGrainOn offset rendering tests failed."); |
| } |
| |
| finishJSTest(); |
| } |
| |
| function runTest() { |
| if (window.testRunner) { |
| testRunner.dumpAsText(); |
| testRunner.waitUntilDone(); |
| } |
| |
| window.jsTestIsAsync = true; |
| |
| // Create offline audio context. |
| context = new webkitOfflineAudioContext(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; |
| }); |
| |
| var grainInfo = playAllGrains(context, linearRampBuffer, numberOfTests); |
| |
| grainOffsetTime = grainInfo.grainOffsetTimes; |
| |
| context.oncomplete = checkResult; |
| context.startRendering(); |
| } |
| |
| runTest(); |
| successfullyParsed = true; |
| |
| </script> |
| |
| <script src="../resources/js-test-post.js"></script> |
| </body> |
| </html> |
