LayoutTests/webaudio/audionode-channel-rules.html - WebKit - Git at Google

 <!DOCTYPE html>

 <html>
 <head>
 <script src="../resources/js-test-pre.js"></script>
 <script type="text/javascript" src="resources/audio-testing.js"></script>
 </head>

 <body>
 <div id="description"></div>
 <div id="console"></div>

 <script>
 description("Channel mixing rules for AudioNodes.");

 var context = 0;
 var sampleRate = 44100;
 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 = ["1", "2", "3", "4", "5", "6", "7", "8", "11", "12", "14", "18", "111", "122", "123", "124", "128"];

 // A list of mixing rules, each of which will be tested against all of the connections in connectionsList.
 var mixingRulesList = [
     {channelCount: 2, channelCountMode: "max", channelInterpretation: "speakers"},
     {channelCount: 4, channelCountMode: "clamped-max", channelInterpretation: "speakers"},

     // Test up-down-mix to some explicit speaker layouts.
     {channelCount: 1, channelCountMode: "explicit", channelInterpretation: "speakers"},
     {channelCount: 2, channelCountMode: "explicit", channelInterpretation: "speakers"},
     {channelCount: 4, channelCountMode: "explicit", channelInterpretation: "speakers"},
     {channelCount: 6, channelCountMode: "explicit", channelInterpretation: "speakers"},

     {channelCount: 2, channelCountMode: "max", channelInterpretation: "discrete"},
     {channelCount: 4, channelCountMode: "clamped-max", channelInterpretation: "discrete"},
     {channelCount: 4, 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) {
         alert("discreteSum(): invalid AudioBuffer!");
         return;
     }

     var numberOfChannels = sourceBuffer.numberOfChannels < destBuffer.numberOfChannels ? sourceBuffer.numberOfChannels : destBuffer.numberOfChannels;
     var length = numberOfChannels;

     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) {
         // Handle mono -> stereo 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 == 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 == 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 {
         // 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(context.destination);

     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 / 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 s = "connections: " + connections + ", " + channelCountMode;

     // channelCount is ignored in "max" mode.
     if (channelCountMode == "clamped-max" || channelCountMode == "explicit") {
         s += "(" + channelCount + ")";
     }

     s += ", " + channelInterpretation;

     var computedNumberOfChannels = computeNumberOfChannels(connections, channelCount, channelCountMode);

     // Show rendered output for this test:
     //
     // console.log(s);
     // var sampleFrameOffset = testNumber * singleTestFrameLength;
     // for (var c = 0; c < renderNumberOfChannels; ++c) {
     //     var data = renderedBuffer.getChannelData(c);
     //     var s = "";
     //     for (var sampleFrame = 0; sampleFrame < singleTestFrameLength; ++sampleFrame) {
     //         s += data[sampleFrame + sampleFrameOffset] + " ";
     //     }
     //     s += "\n";
     //     console.log(s);
     // }
     // return;

     // 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 {
             alert("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];
             }

             // We may need to add an epsilon in the comparison if we add more test vectors.
             if (renderedValue != expectedValue) {
                 var message = s + "rendered: " + renderedValue + " expected: " + expectedValue + " channel: " + c + " frame: " + frame;
                 testFailed(s);
                 return;
             }
         }
     }

     testPassed(s);
 }

 function checkResult(event) {
     var buffer = event.renderedBuffer;

     // Sanity check result.
     if (buffer.length != numberOfTests * singleTestFrameLength || buffer.numberOfChannels != renderNumberOfChannels) {
         testFailed("OfflineAudioContext result not of expected size!");
         finishJSTest();
         return;
     }

     // 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);
         }
     }

     finishJSTest();
 }

 function runTest() {
     if (window.testRunner) {
         testRunner.dumpAsText();
         testRunner.waitUntilDone();
     }

     window.jsTestIsAsync = true;

     // 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 webkitOfflineAudioContext(renderNumberOfChannels, totalFrameLength, sampleRate);

     // Set destination to discrete mixing.
     context.destination.channelCount = renderNumberOfChannels;
     context.destination.channelCountMode = "explicit";
     context.destination.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.
     context.oncomplete = checkResult;
     context.startRendering();
 }

 runTest();

 </script>

 <script src="../resources/js-test-post.js"></script>
 </body>
 </html>
	<!DOCTYPE html>

	<html>
	<head>
	<script src="../resources/js-test-pre.js"></script>
	<script type="text/javascript" src="resources/audio-testing.js"></script>
	</head>

	<body>
	<div id="description"></div>
	<div id="console"></div>

	<script>
	description("Channel mixing rules for AudioNodes.");

	var context = 0;
	var sampleRate = 44100;
	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 = ["1", "2", "3", "4", "5", "6", "7", "8", "11", "12", "14", "18", "111", "122", "123", "124", "128"];

	// A list of mixing rules, each of which will be tested against all of the connections in connectionsList.
	var mixingRulesList = [
	{channelCount: 2, channelCountMode: "max", channelInterpretation: "speakers"},
	{channelCount: 4, channelCountMode: "clamped-max", channelInterpretation: "speakers"},

	// Test up-down-mix to some explicit speaker layouts.
	{channelCount: 1, channelCountMode: "explicit", channelInterpretation: "speakers"},
	{channelCount: 2, channelCountMode: "explicit", channelInterpretation: "speakers"},
	{channelCount: 4, channelCountMode: "explicit", channelInterpretation: "speakers"},
	{channelCount: 6, channelCountMode: "explicit", channelInterpretation: "speakers"},

	{channelCount: 2, channelCountMode: "max", channelInterpretation: "discrete"},
	{channelCount: 4, channelCountMode: "clamped-max", channelInterpretation: "discrete"},
	{channelCount: 4, 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) {
	alert("discreteSum(): invalid AudioBuffer!");
	return;
	}

	var numberOfChannels = sourceBuffer.numberOfChannels < destBuffer.numberOfChannels ? sourceBuffer.numberOfChannels : destBuffer.numberOfChannels;
	var length = numberOfChannels;

	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) {
	// Handle mono -> stereo 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 == 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 == 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 {
	// 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(context.destination);

	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 / 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 s = "connections: " + connections + ", " + channelCountMode;

	// channelCount is ignored in "max" mode.
	if (channelCountMode == "clamped-max" \|\| channelCountMode == "explicit") {
	s += "(" + channelCount + ")";
	}

	s += ", " + channelInterpretation;

	var computedNumberOfChannels = computeNumberOfChannels(connections, channelCount, channelCountMode);

	// Show rendered output for this test:
	//
	// console.log(s);
	// var sampleFrameOffset = testNumber * singleTestFrameLength;
	// for (var c = 0; c < renderNumberOfChannels; ++c) {
	// var data = renderedBuffer.getChannelData(c);
	// var s = "";
	// for (var sampleFrame = 0; sampleFrame < singleTestFrameLength; ++sampleFrame) {
	// s += data[sampleFrame + sampleFrameOffset] + " ";
	// }
	// s += "\n";
	// console.log(s);
	// }
	// return;

	// 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 {
	alert("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];
	}

	// We may need to add an epsilon in the comparison if we add more test vectors.
	if (renderedValue != expectedValue) {
	var message = s + "rendered: " + renderedValue + " expected: " + expectedValue + " channel: " + c + " frame: " + frame;
	testFailed(s);
	return;
	}
	}
	}

	testPassed(s);
	}

	function checkResult(event) {
	var buffer = event.renderedBuffer;

	// Sanity check result.
	if (buffer.length != numberOfTests * singleTestFrameLength \|\| buffer.numberOfChannels != renderNumberOfChannels) {
	testFailed("OfflineAudioContext result not of expected size!");
	finishJSTest();
	return;
	}

	// 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);
	}
	}

	finishJSTest();
	}

	function runTest() {
	if (window.testRunner) {
	testRunner.dumpAsText();
	testRunner.waitUntilDone();
	}

	window.jsTestIsAsync = true;

	// 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 webkitOfflineAudioContext(renderNumberOfChannels, totalFrameLength, sampleRate);

	// Set destination to discrete mixing.
	context.destination.channelCount = renderNumberOfChannels;
	context.destination.channelCountMode = "explicit";
	context.destination.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.
	context.oncomplete = checkResult;
	context.startRendering();
	}

	runTest();

	</script>

	<script src="../resources/js-test-post.js"></script>
	</body>
	</html>