| Index: LayoutTests/webaudio/dynamicscompressor-simple.html
|
| diff --git a/LayoutTests/webaudio/dynamicscompressor-simple.html b/LayoutTests/webaudio/dynamicscompressor-simple.html
|
| new file mode 100644
|
| index 0000000000000000000000000000000000000000..b4000d21e8b656ee9a898138347f1a3c2abf05f8
|
| --- /dev/null
|
| +++ b/LayoutTests/webaudio/dynamicscompressor-simple.html
|
| @@ -0,0 +1,81 @@
|
| +<!DOCTYPE HTML>
|
| +<html>
|
| + <head>
|
| + <script src="../resources/js-test.js"></script>
|
| + <script type="text/javascript" src="resources/audio-testing.js"></script>
|
| + </head>
|
| +
|
| + <body>
|
| + <div id="description"></div>
|
| + <div id="console"></div>
|
| +
|
| + <script>
|
| + description("Test pre-emphasis in DynamicsCompressor is removed");
|
| + var context;
|
| + var sampleRate = 44100;
|
| + var lengthInSeconds = 1;
|
| + var renderedData;
|
| + // This threshold experimentally determined. It depends on the the gain value of the gain node
|
| + // below and the dynamics compressor. When the DynamicsCompressor had the pre-emphasis
|
| + // filters, the peak value is about 0.21. Without it, the peak is 0.85.
|
| + var peakThreshold = 0.85;
|
| +
|
| + function checkResult(event) {
|
| + var renderedBuffer = event.renderedBuffer;
|
| + renderedData = renderedBuffer.getChannelData(0);
|
| + // Search for a peak in the last part of the data.
|
| + var startSample = sampleRate * (lengthInSeconds - .1);
|
| + var endSample = renderedData.length;
|
| + var k;
|
| + var peak = -1;
|
| +
|
| + for (k = startSample; k < endSample; ++k) {
|
| + var sample = Math.abs(renderedData[k]);
|
| + if (peak < sample)
|
| + peak = sample;
|
| + }
|
| +
|
| + if (peak >= peakThreshold) {
|
| + testPassed("Pre-emphasis effect not applied as expected..");
|
| + } else {
|
| + testFailed("Pre-emphasis caused output to be decreased to " + peak
|
| + + " (expected >= " + peakThreshold + ")");
|
| + }
|
| +
|
| + finishJSTest();
|
| + }
|
| +
|
| + function runTest() {
|
| + if (!window.testRunner) {
|
| + testRunner.dumpAsTest();
|
| + testRunner.waitUntilDone();
|
| + }
|
| +
|
| + window.jsTestIsAsync = true;
|
| +
|
| + context = new webkitOfflineAudioContext(1, sampleRate * lengthInSeconds, sampleRate);
|
| + // Connect an oscillator to a gain node to the compressor. The
|
| + // oscillator frequency is set to a high value for the (original)
|
| + // emphasis to kick in. The gain is a little extra boost to get the
|
| + // compressor enabled.
|
| + //
|
| + var osc = context.createOscillator();
|
| + osc.frequency.value = 15000;
|
| + var gain = context.createGain();
|
| + gain.gain.value = 1.5;
|
| + var compressor = context.createDynamicsCompressor();
|
| + osc.connect(gain);
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| + gain.connect(compressor);
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| + compressor.connect(context.destination);
|
| + osc.start();
|
| + context.oncomplete = checkResult;
|
| + context.startRendering();
|
| + }
|
| +
|
| + runTest();
|
| + successfullyParsed = true;
|
| +
|
| + </script>
|
| +
|
| + </body>
|
| +</html>
|
|
|
Chromium Code Reviews
Issue 152333003:
Remove emphasis/de-emphasis filters from DynamicsCompressor. (Closed)
Base URL: svn://svn.chromium.org/blink/trunk