The Tor Browser: comparison content/media/webaudio/test/test

--1:000000000000
+:b0c4982d82ee
+<!DOCTYPE html>
+<html>
+<head>
+<title>Testcase for AudioNode channel up-mix/down-mix rules</title>
+<script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+<script type="text/javascript" src="webaudio.js"></script>
+<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<script>
+// This test is based on http://src.chromium.org/viewvc/blink/trunk/LayoutTests/webaudio/audionode-channel-rules.html
+var context = null;
+var sp = null;
+var renderNumberOfChannels = 8;
+var singleTestFrameLength = 8;
+var testBuffers;
+// A list of connections to an AudioNode input, each of which is to be used in one or more specific test cases.
+// Each element in the list is a string, with the number of connections corresponding to the length of the string,
+// and each character in the string is from '1' to '8' representing a 1 to 8 channel connection (from an AudioNode output).
+// For example, the string "128" means 3 connections, having 1, 2, and 8 channels respectively.
+var connectionsList = [];
+for (var i = 1; i <= 8; ++i) {
+connectionsList.push(i.toString());
+for (var j = 1; j <= 8; ++j) {
+connectionsList.push(i.toString() + j.toString());
+}
+}
+// A list of mixing rules, each of which will be tested against all of the connections in connectionsList.
+var mixingRulesList = [
+{channelCount: 1, channelCountMode: "max", channelInterpretation: "speakers"},
+{channelCount: 2, channelCountMode: "clamped-max", channelInterpretation: "speakers"},
+{channelCount: 3, channelCountMode: "clamped-max", channelInterpretation: "speakers"},
+{channelCount: 4, channelCountMode: "clamped-max", channelInterpretation: "speakers"},
+{channelCount: 5, channelCountMode: "clamped-max", channelInterpretation: "speakers"},
+{channelCount: 6, channelCountMode: "clamped-max", channelInterpretation: "speakers"},
+{channelCount: 7, channelCountMode: "clamped-max", channelInterpretation: "speakers"},
+{channelCount: 2, channelCountMode: "explicit", channelInterpretation: "speakers"},
+{channelCount: 3, channelCountMode: "explicit", channelInterpretation: "speakers"},
+{channelCount: 4, channelCountMode: "explicit", channelInterpretation: "speakers"},
+{channelCount: 5, channelCountMode: "explicit", channelInterpretation: "speakers"},
+{channelCount: 6, channelCountMode: "explicit", channelInterpretation: "speakers"},
+{channelCount: 7, channelCountMode: "explicit", channelInterpretation: "speakers"},
+{channelCount: 8, channelCountMode: "explicit", channelInterpretation: "speakers"},
+{channelCount: 1, channelCountMode: "max", channelInterpretation: "discrete"},
+{channelCount: 2, channelCountMode: "clamped-max", channelInterpretation: "discrete"},
+{channelCount: 3, channelCountMode: "clamped-max", channelInterpretation: "discrete"},
+{channelCount: 4, channelCountMode: "clamped-max", channelInterpretation: "discrete"},
+{channelCount: 5, channelCountMode: "clamped-max", channelInterpretation: "discrete"},
+{channelCount: 6, channelCountMode: "clamped-max", channelInterpretation: "discrete"},
+{channelCount: 3, channelCountMode: "explicit", channelInterpretation: "discrete"},
+{channelCount: 4, channelCountMode: "explicit", channelInterpretation: "discrete"},
+{channelCount: 5, channelCountMode: "explicit", channelInterpretation: "discrete"},
+{channelCount: 6, channelCountMode: "explicit", channelInterpretation: "discrete"},
+{channelCount: 7, channelCountMode: "explicit", channelInterpretation: "discrete"},
+{channelCount: 8, channelCountMode: "explicit", channelInterpretation: "discrete"},
+];
+var numberOfTests = mixingRulesList.length * connectionsList.length;
+// Create an n-channel buffer, with all sample data zero except for a shifted impulse.
+// The impulse position depends on the channel index.
+// For example, for a 4-channel buffer:
+// channel0: 1 0 0 0 0 0 0 0
+// channel1: 0 1 0 0 0 0 0 0
+// channel2: 0 0 1 0 0 0 0 0
+// channel3: 0 0 0 1 0 0 0 0
+function createTestBuffer(numberOfChannels) {
+var buffer = context.createBuffer(numberOfChannels, singleTestFrameLength, context.sampleRate);
+for (var i = 0; i < numberOfChannels; ++i) {
+var data = buffer.getChannelData(i);
+data[i] = 1;
+}
+return buffer;
+}
+// Discrete channel interpretation mixing:
+// https://dvcs.w3.org/hg/audio/raw-file/tip/webaudio/specification.html#UpMix
+// up-mix by filling channels until they run out then ignore remaining dest channels.
+// down-mix by filling as many channels as possible, then dropping remaining source channels.
+function discreteSum(sourceBuffer, destBuffer) {
+if (sourceBuffer.length != destBuffer.length) {
+is(sourceBuffer.length, destBuffer.length, "source and destination buffers should have the same length");
+}
+var numberOfChannels = Math.min(sourceBuffer.numberOfChannels, destBuffer.numberOfChannels);
+var length = sourceBuffer.length;
+for (var c = 0; c < numberOfChannels; ++c) {
+var source = sourceBuffer.getChannelData(c);
+var dest = destBuffer.getChannelData(c);
+for (var i = 0; i < length; ++i) {
+dest[i] += source[i];
+}
+}
+}
+// Speaker channel interpretation mixing:
+// https://dvcs.w3.org/hg/audio/raw-file/tip/webaudio/specification.html#UpMix
+function speakersSum(sourceBuffer, destBuffer)
+{
+var numberOfSourceChannels = sourceBuffer.numberOfChannels;
+var numberOfDestinationChannels = destBuffer.numberOfChannels;
+var length = destBuffer.length;
+if ((numberOfDestinationChannels == 2 && numberOfSourceChannels == 1) ||
+(numberOfDestinationChannels == 4 && numberOfSourceChannels == 1)) {
+// Handle mono -> stereo/Quad case (summing mono channel into both left and right).
+var source = sourceBuffer.getChannelData(0);
+var destL = destBuffer.getChannelData(0);
+var destR = destBuffer.getChannelData(1);
+for (var i = 0; i < length; ++i) {
+destL[i] += source[i];
+destR[i] += source[i];
+}
+} else if ((numberOfDestinationChannels == 4 && numberOfSourceChannels == 2) ||
+(numberOfDestinationChannels == 6 && numberOfSourceChannels == 2)) {
+// Handle stereo -> Quad/5.1 case (summing left and right channels into the output's left and right).
+var sourceL = sourceBuffer.getChannelData(0);
+var sourceR = sourceBuffer.getChannelData(1);
+var destL = destBuffer.getChannelData(0);
+var destR = destBuffer.getChannelData(1);
+for (var i = 0; i < length; ++i) {
+destL[i] += sourceL[i];
+destR[i] += sourceR[i];
+}
+} else if (numberOfDestinationChannels == 1 && numberOfSourceChannels == 2) {
+// Handle stereo -> mono case. output += 0.5 * (input.L + input.R).
+var sourceL = sourceBuffer.getChannelData(0);
+var sourceR = sourceBuffer.getChannelData(1);
+var dest = destBuffer.getChannelData(0);
+for (var i = 0; i < length; ++i) {
+dest[i] += 0.5 * (sourceL[i] + sourceR[i]);
+}
+} else if (numberOfDestinationChannels == 1 && numberOfSourceChannels == 4) {
+// Handle Quad -> mono case. output += 0.25 * (input.L + input.R + input.SL + input.SR).
+var sourceL = sourceBuffer.getChannelData(0);
+var sourceR = sourceBuffer.getChannelData(1);
+var sourceSL = sourceBuffer.getChannelData(2);
+var sourceSR = sourceBuffer.getChannelData(3);
+var dest = destBuffer.getChannelData(0);
+for (var i = 0; i < length; ++i) {
+dest[i] += 0.25 * (sourceL[i] + sourceR[i] + sourceSL[i] + sourceSR[i]);
+}
+} else if (numberOfDestinationChannels == 2 && numberOfSourceChannels == 4) {
+// Handle Quad -> stereo case. outputLeft += 0.5 * (input.L + input.SL),
+//                             outputRight += 0.5 * (input.R + input.SR).
+var sourceL = sourceBuffer.getChannelData(0);
+var sourceR = sourceBuffer.getChannelData(1);
+var sourceSL = sourceBuffer.getChannelData(2);
+var sourceSR = sourceBuffer.getChannelData(3);
+var destL = destBuffer.getChannelData(0);
+var destR = destBuffer.getChannelData(1);
+for (var i = 0; i < length; ++i) {
+destL[i] += 0.5 * (sourceL[i] + sourceSL[i]);
+destR[i] += 0.5 * (sourceR[i] + sourceSR[i]);
+}
+} else if (numberOfDestinationChannels == 6 && numberOfSourceChannels == 4) {
+// Handle Quad -> 5.1 case. outputLeft += (inputL, inputR, 0, 0, inputSL, inputSR)
+var sourceL = sourceBuffer.getChannelData(0);
+var sourceR = sourceBuffer.getChannelData(1);
+var sourceSL = sourceBuffer.getChannelData(2);
+var sourceSR = sourceBuffer.getChannelData(3);
+var destL = destBuffer.getChannelData(0);
+var destR = destBuffer.getChannelData(1);
+var destSL = destBuffer.getChannelData(4);
+var destSR = destBuffer.getChannelData(5);
+for (var i = 0; i < length; ++i) {
+destL[i] += sourceL[i];
+destR[i] += sourceR[i];
+destSL[i] += sourceSL[i];
+destSR[i] += sourceSR[i];
+}
+} else if (numberOfDestinationChannels == 6 && numberOfSourceChannels == 1) {
+// Handle mono -> 5.1 case, sum mono channel into center.
+var source = sourceBuffer.getChannelData(0);
+var dest = destBuffer.getChannelData(2);
+for (var i = 0; i < length; ++i) {
+dest[i] += source[i];
+}
+} else if (numberOfDestinationChannels == 1 && numberOfSourceChannels == 6) {
+// Handle 5.1 -> mono.
+var sourceL = sourceBuffer.getChannelData(0);
+var sourceR = sourceBuffer.getChannelData(1);
+var sourceC = sourceBuffer.getChannelData(2);
+// skip LFE for now, according to current spec.
+var sourceSL = sourceBuffer.getChannelData(4);
+var sourceSR = sourceBuffer.getChannelData(5);
+var dest = destBuffer.getChannelData(0);
+for (var i = 0; i < length; ++i) {
+dest[i] += 0.7071 * (sourceL[i] + sourceR[i]) + sourceC[i] + 0.5 * (sourceSL[i] + sourceSR[i]);
+}
+} else if (numberOfDestinationChannels == 2 && numberOfSourceChannels == 6) {
+// Handle 5.1 -> stereo.
+var sourceL = sourceBuffer.getChannelData(0);
+var sourceR = sourceBuffer.getChannelData(1);
+var sourceC = sourceBuffer.getChannelData(2);
+// skip LFE for now, according to current spec.
+var sourceSL = sourceBuffer.getChannelData(4);
+var sourceSR = sourceBuffer.getChannelData(5);
+var destL = destBuffer.getChannelData(0);
+var destR = destBuffer.getChannelData(1);
+for (var i = 0; i < length; ++i) {
+destL[i] += sourceL[i] + 0.7071 * (sourceC[i] + sourceSL[i]);
+destR[i] += sourceR[i] + 0.7071 * (sourceC[i] + sourceSR[i]);
+}
+} else if (numberOfDestinationChannels == 4 && numberOfSourceChannels == 6) {
+// Handle 5.1 -> Quad.
+var sourceL = sourceBuffer.getChannelData(0);
+var sourceR = sourceBuffer.getChannelData(1);
+var sourceC = sourceBuffer.getChannelData(2);
+// skip LFE for now, according to current spec.
+var sourceSL = sourceBuffer.getChannelData(4);
+var sourceSR = sourceBuffer.getChannelData(5);
+var destL = destBuffer.getChannelData(0);
+var destR = destBuffer.getChannelData(1);
+var destSL = destBuffer.getChannelData(2);
+var destSR = destBuffer.getChannelData(3);
+for (var i = 0; i < length; ++i) {
+destL[i] += sourceL[i] + 0.7071 * sourceC[i];
+destR[i] += sourceR[i] + 0.7071 * sourceC[i];
+destSL[i] += sourceSL[i];
+destSR[i] += sourceSR[i];
+}
+} else {
+// Fallback for unknown combinations.
+discreteSum(sourceBuffer, destBuffer);
+}
+}
+function scheduleTest(testNumber, connections, channelCount, channelCountMode, channelInterpretation) {
+var mixNode = context.createGain();
+mixNode.channelCount = channelCount;
+mixNode.channelCountMode = channelCountMode;
+mixNode.channelInterpretation = channelInterpretation;
+mixNode.connect(sp);
+for (var i = 0; i < connections.length; ++i) {
+var connectionNumberOfChannels = connections.charCodeAt(i) - "0".charCodeAt(0);
+var source = context.createBufferSource();
+// Get a buffer with the right number of channels, converting from 1-based to 0-based index.
+var buffer = testBuffers[connectionNumberOfChannels - 1];
+source.buffer = buffer;
+source.connect(mixNode);
+// Start at the right offset.
+var sampleFrameOffset = testNumber * singleTestFrameLength;
+var time = sampleFrameOffset / context.sampleRate;
+source.start(time);
+}
+}
+function computeNumberOfChannels(connections, channelCount, channelCountMode) {
+if (channelCountMode == "explicit")
+return channelCount;
+var computedNumberOfChannels = 1; // Must have at least one channel.
+// Compute "computedNumberOfChannels" based on all the connections.
+for (var i = 0; i < connections.length; ++i) {
+var connectionNumberOfChannels = connections.charCodeAt(i) - "0".charCodeAt(0);
+computedNumberOfChannels = Math.max(computedNumberOfChannels, connectionNumberOfChannels);
+}
+if (channelCountMode == "clamped-max")
+computedNumberOfChannels = Math.min(computedNumberOfChannels, channelCount);
+return computedNumberOfChannels;
+}
+function checkTestResult(renderedBuffer, testNumber, connections, channelCount, channelCountMode, channelInterpretation) {
+var computedNumberOfChannels = computeNumberOfChannels(connections, channelCount, channelCountMode);
+// Create a zero-initialized silent AudioBuffer with computedNumberOfChannels.
+var destBuffer = context.createBuffer(computedNumberOfChannels, singleTestFrameLength, context.sampleRate);
+// Mix all of the connections into the destination buffer.
+for (var i = 0; i < connections.length; ++i) {
+var connectionNumberOfChannels = connections.charCodeAt(i) - "0".charCodeAt(0);
+var sourceBuffer = testBuffers[connectionNumberOfChannels - 1]; // convert from 1-based to 0-based index
+if (channelInterpretation == "speakers") {
+speakersSum(sourceBuffer, destBuffer);
+} else if (channelInterpretation == "discrete") {
+discreteSum(sourceBuffer, destBuffer);
+} else {
+ok(false, "Invalid channel interpretation!");
+}
+}
+// Validate that destBuffer matches the rendered output.
+// We need to check the rendered output at a specific sample-frame-offset corresponding
+// to the specific test case we're checking for based on testNumber.
+var sampleFrameOffset = testNumber * singleTestFrameLength;
+for (var c = 0; c < renderNumberOfChannels; ++c) {
+var renderedData = renderedBuffer.getChannelData(c);
+for (var frame = 0; frame < singleTestFrameLength; ++frame) {
+var renderedValue = renderedData[frame + sampleFrameOffset];
+var expectedValue = 0;
+if (c < destBuffer.numberOfChannels) {
+var expectedData = destBuffer.getChannelData(c);
+expectedValue = expectedData[frame];
+}
+if (Math.abs(renderedValue - expectedValue) > 1e-4) {
+var s = "connections: " + connections + ", " + channelCountMode;
+// channelCount is ignored in "max" mode.
+if (channelCountMode == "clamped-max" || channelCountMode == "explicit") {
+s += "(" + channelCount + ")";
+}
+s += ", " + channelInterpretation + ". ";
+var message = s + "rendered: " + renderedValue + " expected: " + expectedValue + " channel: " + c + " frame: " + frame;
+is(renderedValue, expectedValue, message);
+}
+}
+}
+}
+function checkResult(event) {
+var buffer = event.inputBuffer;
+// Sanity check result.
+ok(buffer.length != numberOfTests * singleTestFrameLength ||
+buffer.numberOfChannels != renderNumberOfChannels, "Sanity check");
+// Check all the tests.
+var testNumber = 0;
+for (var m = 0; m < mixingRulesList.length; ++m) {
+var mixingRules = mixingRulesList[m];
+for (var i = 0; i < connectionsList.length; ++i, ++testNumber) {
+checkTestResult(buffer, testNumber, connectionsList[i], mixingRules.channelCount, mixingRules.channelCountMode, mixingRules.channelInterpretation);
+}
+}
+sp.onaudioprocess = null;
+SimpleTest.finish();
+}
+SimpleTest.waitForExplicitFinish();
+function runTest() {
+// Create 8-channel offline audio context.
+// Each test will render 8 sample-frames starting at sample-frame position testNumber * 8.
+var totalFrameLength = numberOfTests * singleTestFrameLength;
+context = new AudioContext();
+var nextPowerOfTwo = 256;
+while (nextPowerOfTwo < totalFrameLength) {
+nextPowerOfTwo *= 2;
+}
+sp = context.createScriptProcessor(nextPowerOfTwo, renderNumberOfChannels);
+// Set destination to discrete mixing.
+sp.channelCount = renderNumberOfChannels;
+sp.channelCountMode = "explicit";
+sp.channelInterpretation = "discrete";
+// Create test buffers from 1 to 8 channels.
+testBuffers = new Array();
+for (var i = 0; i < renderNumberOfChannels; ++i) {
+testBuffers[i] = createTestBuffer(i + 1);
+}
+// Schedule all the tests.
+var testNumber = 0;
+for (var m = 0; m < mixingRulesList.length; ++m) {
+var mixingRules = mixingRulesList[m];
+for (var i = 0; i < connectionsList.length; ++i, ++testNumber) {
+scheduleTest(testNumber, connectionsList[i], mixingRules.channelCount, mixingRules.channelCountMode, mixingRules.channelInterpretation);
+}
+}
+// Render then check results.
+sp.onaudioprocess = checkResult;
+}
+runTest();
+</script>
+</body>
+</html>

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comparison: content/media/webaudio/test/test_mixingRules.html

content/media/webaudio/test/test_mixingRules.html