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