Chromium Code Reviews Chromium Code Reviews
Issue 670863002:
Rebase oscillator sine test result. (Closed)
Base URL: svn://svn.chromium.org/blink/trunk| Index: LayoutTests/webaudio/osc-sine-sweep-snr.html |
| diff --git a/LayoutTests/webaudio/osc-sine-sweep-snr.html b/LayoutTests/webaudio/osc-sine-sweep-snr.html |
| new file mode 100644 |
| index 0000000000000000000000000000000000000000..8115285ec25af4e64f0fa6a290ecadca4ab68080 |
| --- /dev/null |
| +++ b/LayoutTests/webaudio/osc-sine-sweep-snr.html |
| @@ -0,0 +1,119 @@ |
| +<!doctype html> |
| +<html> |
| + <head> |
| + <title>Test Oscillator Node: sine</title> |
| + <script src="resources/compatibility.js"></script> |
| + <script src="resources/buffer-loader.js"></script> |
| + <script src="../resources/js-test.js"></script> |
| + <script src="resources/oscillator-testing.js"></script> |
| + </head> |
| + |
| + <body> |
| + <script> |
| + // See oscillator-sine.html for more info on the actual wave shape |
|
hongchan
2014/11/11 19:03:14
TYPO: Missing period?
Raymond Toy
2014/11/11 19:48:02
Done.
|
| + // |
| + // This test is a partial duplicate of oscillator-sine but is designed to be less sensitive |
| + // to the actual output versus the reference. Instead of requiring an exact match, we check |
| + // that for several criteria to pass. The SNR between the actual and expected signals be |
|
hongchan
2014/11/11 19:03:14
TYPO: "should" or "must" be?
Raymond Toy
2014/11/11 19:48:02
Done.
|
| + // large enough. The maximum difference must be below a threshold and the actual number of |
| + // points that are different must be below a threshold. |
| + |
| + var sampleRate = 44100.0; |
| + var nyquist = 0.5 * sampleRate; |
| + var lengthInSeconds = 4; |
| + var lowFrequency = 10; |
| + var highFrequency = nyquist + 2000; // go slightly higher than nyquist to make sure we generate silence there |
| + var context = 0; |
| + var reference = 0; |
| + var renderedData = 0; |
| + var signalPower = 0; |
| + var noisePower = 0; |
| + |
| + // SNR must be greater than this to pass the test. |
| + // Q: Why is the SNR threshold not infinity? |
| + // A: The reference result is a 16-bit WAV file, so it won't compare exactly with the |
| + // floating point result. |
| + var thresholdSNR = 86.5; |
| + // Max diff must be less than this to pass the test |
| + var thresholdDiff = 1.5; |
| + // The number of times the diff exceeds the threshold should be less than this to pass. |
| + var thresholdDiffCount = 8000; |
| + |
| + function db(sPower, nPower) |
| + { |
| + if (nPower == 0 && sPower > 0) { |
| + return 1000; |
| + } |
| + return 10 * Math.log10(sPower / nPower); |
| + } |
| + |
| + function checkResult (event) { |
| + renderedData = event.renderedBuffer.getChannelData(0); |
| + // Compute signal to noise ratio between the result and the reference. Also keep track |
| + // of the max difference (and position). |
| + |
| + var maxError = -1; |
| + var errorPosition = -1; |
| + var diffCount = 0; |
| + |
| + for (var k = 0; k < renderedData.length; ++k) { |
| + var diff = renderedData[k] - reference[k]; |
| + noisePower += diff * diff; |
| + signalPower += reference[k] * reference[k]; |
| + if (Math.abs(diff) > maxError) { |
| + maxError = Math.abs(diff); |
| + errorPosition = k; |
| + } |
| + // The reference file is a 16-bit WAV file, so we will never get an exact match |
| + // between it and the actual floating-point result. |
| + if (diff > 1/32768) { |
| + diffCount++; |
| + } |
| + } |
| + |
| + var snr = db(signalPower, noisePower); |
| + if (snr < thresholdSNR) { |
| + testFailed("Expected SNR of " + thresholdSNR + " dB, but actual SNR is " + snr + " dB"); |
| + } else { |
| + testPassed("Exceeded SNR threshold of " + thresholdSNR + " dB"); |
| + } |
| + if (maxError > thresholdDiff) { |
| + testFailed("Maximum difference of " + maxError + " at " + errorPosition + " exceeded threshold of " + thresholdDiff); |
| + } else { |
| + testPassed("Maximum difference below threshold of " + thresholdDiff); |
| + } |
| + if (diffCount > thresholdDiffCount) { |
| + testFailed(diffCount + " differences found but expected no more than " + thresholdDiffCount); |
| + } else { |
| + testPassed("Number of differences between actual and expected result is less than " + thresholdDiffCount); |
| + } |
| + |
| + finishJSTest(); |
| + } |
| + |
| + function finishedLoading(bufferList) { |
| + reference = bufferList[0].getChannelData(0); |
| + generateExponentialOscillatorSweep(context, "sine"); |
| + context.oncomplete = checkResult; |
| + context.startRendering(); |
| + } |
| + |
| + function runTest () { |
| + window.jsTestIsAsync = true; |
| + |
| + // Create offline audio context. |
| + context = new OfflineAudioContext(1, sampleRate * lengthInSeconds, sampleRate); |
| + |
| + bufferLoader = new BufferLoader( |
| + context, |
| + [ "oscillator-sine-expected.wav" ], |
| + finishedLoading); |
| + |
| + bufferLoader.load(); |
| + } |
| + |
| + runTest(); |
| + successfullyParsed = true; |
| + </script> |
| + </body> |
| +</html> |
