1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/webaudio/test/test_mediaStreamAudioSourceNodeResampling.html Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,75 @@
1.4 +<!DOCTYPE HTML>
1.5 +<html>
1.6 +<meta charset="utf-8">
1.7 +<head>
1.8 + <title>Test MediaStreamAudioSourceNode processing is correct</title>
1.9 + <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
1.10 + <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
1.11 +</head>
1.12 +<body>
1.13 +<pre id="test">
1.14 +<script class="testbody" type="text/javascript">
1.15 +SimpleTest.waitForExplicitFinish();
1.16 +
1.17 +function test() {
1.18 + var audio = new Audio("small-shot.ogg");
1.19 + var context = new AudioContext();
1.20 + var node = context.createMediaStreamSource(audio.mozCaptureStreamUntilEnded());
1.21 + var sp = context.createScriptProcessor(2048, 1);
1.22 + node.connect(sp);
1.23 + sp.connect(context.destination); // work around bug 916387
1.24 + var expectedMinNonzeroSampleCount;
1.25 + var expectedMaxNonzeroSampleCount;
1.26 + var nonzeroSampleCount = 0;
1.27 + var complete = false;
1.28 + var iterationCount = 0;
1.29 +
1.30 + // This test ensures we receive at least expectedSampleCount nonzero samples
1.31 + function processSamples(e) {
1.32 + if (complete) {
1.33 + return;
1.34 + }
1.35 +
1.36 + if (iterationCount == 0) {
1.37 + // Don't start playing the audio until the AudioContext stuff is connected
1.38 + // and running.
1.39 + audio.play();
1.40 + }
1.41 + ++iterationCount;
1.42 +
1.43 + var buf = e.inputBuffer.getChannelData(0);
1.44 + var nonzeroSamplesThisBuffer = 0;
1.45 + for (var i = 0; i < buf.length; ++i) {
1.46 + if (buf[i] != 0) {
1.47 + ++nonzeroSamplesThisBuffer;
1.48 + }
1.49 + }
1.50 + nonzeroSampleCount += nonzeroSamplesThisBuffer;
1.51 + is(e.inputBuffer.numberOfChannels, 1,
1.52 + "Checking data channel count (nonzeroSamplesThisBuffer=" +
1.53 + nonzeroSamplesThisBuffer + ")");
1.54 + ok(nonzeroSampleCount <= expectedMaxNonzeroSampleCount,
1.55 + "Too many nonzero samples (got " + nonzeroSampleCount + ", expected max " + expectedMaxNonzeroSampleCount + ")");
1.56 + if (nonzeroSampleCount >= expectedMinNonzeroSampleCount &&
1.57 + nonzeroSamplesThisBuffer == 0) {
1.58 + ok(true,
1.59 + "Check received enough nonzero samples (got " + nonzeroSampleCount + ", expected min " + expectedMinNonzeroSampleCount + ")");
1.60 + SimpleTest.finish();
1.61 + complete = true;
1.62 + }
1.63 + }
1.64 +
1.65 + audio.oncanplaythrough = function() {
1.66 + // Use a fuzz factor of 100 to account for samples that just happen to be zero
1.67 + expectedMinNonzeroSampleCount = Math.floor(audio.duration*context.sampleRate) - 100;
1.68 + expectedMaxNonzeroSampleCount = Math.floor(audio.duration*context.sampleRate) + 500;
1.69 + sp.onaudioprocess = processSamples;
1.70 + };
1.71 +}
1.72 +
1.73 +SpecialPowers.pushPrefEnv({"set": [["media.preload.default", 2], ["media.preload.auto", 3]]}, test);
1.74 +
1.75 +</script>
1.76 +</pre>
1.77 +</body>
1.78 +</html>
