<!DOCTYPE html>
<html>
<head>
<title>
audionode-channel-rules.html
</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/webaudio/resources/audit-util.js"></script>
<script src="/webaudio/resources/audit.js"></script>
<script src="/webaudio/resources/mixing-rules.js"></script>
</head>
<body>
<script id="layout-test-code">
let audit = Audit.createTaskRunner();
let context = 0;
// Use a power of two to eliminate round-off converting frames to time.
let sampleRate = 32768;
let renderNumberOfChannels = 8;
let singleTestFrameLength = 8;
let 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.
let 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.
let 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'
},
];
let numberOfTests = mixingRulesList.length * connectionsList.length;
// Print out the information for an individual test case.
function printTestInformation(
testNumber, actualBuffer, expectedBuffer, frameLength, frameOffset) {
let actual = stringifyBuffer(actualBuffer, frameLength);
let expected =
stringifyBuffer(expectedBuffer, frameLength, frameOffset);
debug('TEST CASE #' + testNumber + '\n');
debug('actual channels:\n' + actual);
debug('expected channels:\n' + expected);
}
function scheduleTest(
testNumber, connections, channelCount, channelCountMode,
channelInterpretation) {
let mixNode = context.createGain();
mixNode.channelCount = channelCount;
mixNode.channelCountMode = channelCountMode;
mixNode.channelInterpretation = channelInterpretation;
mixNode.connect(context.destination);
for (let i = 0; i < connections.length; ++i) {
let connectionNumberOfChannels =
connections.charCodeAt(i) - '0'.charCodeAt(0);
let source = context.createBufferSource();
// Get a buffer with the right number of channels, converting from
// 1-based to 0-based index.
let buffer = testBuffers[connectionNumberOfChannels - 1];
source.buffer = buffer;
source.connect(mixNode);
// Start at the right offset.
let sampleFrameOffset = testNumber * singleTestFrameLength;
let time = sampleFrameOffset / sampleRate;
source.start(time);
}
}
function checkTestResult(
renderedBuffer, testNumber, connections, channelCount,
channelCountMode, channelInterpretation, should) {
let s = 'connections: ' + connections + ', ' + channelCountMode;
// channelCount is ignored in "max" mode.
if (channelCountMode == 'clamped-max' ||
channelCountMode == 'explicit') {
s += '(' + channelCount + ')';
}
s += ', ' + channelInterpretation;
let computedNumberOfChannels = computeNumberOfChannels(
connections, channelCount, channelCountMode);
// Create a zero-initialized silent AudioBuffer with
// computedNumberOfChannels.
let destBuffer = context.createBuffer(
computedNumberOfChannels, singleTestFrameLength,
context.sampleRate);
// Mix all of the connections into the destination buffer.
for (let i = 0; i < connections.length; ++i) {
let connectionNumberOfChannels =
connections.charCodeAt(i) - '0'.charCodeAt(0);
let 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!');
}
}
// Use this when debugging mixing rules.
// printTestInformation(testNumber, renderedBuffer, destBuffer,
// singleTestFrameLength, sampleFrameOffset);
// 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.
let sampleFrameOffset = testNumber * singleTestFrameLength;
for (let c = 0; c < renderNumberOfChannels; ++c) {
let renderedData = renderedBuffer.getChannelData(c);
for (let frame = 0; frame < singleTestFrameLength; ++frame) {
let renderedValue = renderedData[frame + sampleFrameOffset];
let expectedValue = 0;
if (c < destBuffer.numberOfChannels) {
let 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) {
let message = s + 'rendered: ' + renderedValue +
' expected: ' + expectedValue + ' channel: ' + c +
' frame: ' + frame;
// testFailed(s);
should(renderedValue, s).beEqualTo(expectedValue);
return;
}
}
}
should(true, s).beTrue();
}
function checkResult(buffer, should) {
// Sanity check result.
should(buffer.length, 'Rendered number of frames')
.beEqualTo(numberOfTests * singleTestFrameLength);
should(buffer.numberOfChannels, 'Rendered number of channels')
.beEqualTo(renderNumberOfChannels);
// Check all the tests.
let testNumber = 0;
for (let m = 0; m < mixingRulesList.length; ++m) {
let mixingRules = mixingRulesList[m];
for (let i = 0; i < connectionsList.length; ++i, ++testNumber) {
checkTestResult(
buffer, testNumber, connectionsList[i],
mixingRules.channelCount, mixingRules.channelCountMode,
mixingRules.channelInterpretation, should);
}
}
}
audit.define(
{label: 'test', description: 'Channel mixing rules for AudioNodes'},
function(task, should) {
// Create 8-channel offline audio context. Each test will render 8
// sample-frames starting at sample-frame position testNumber * 8.
let totalFrameLength = numberOfTests * singleTestFrameLength;
context = new OfflineAudioContext(
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 (let i = 0; i < renderNumberOfChannels; ++i) {
testBuffers[i] = createShiftedImpulseBuffer(
context, i + 1, singleTestFrameLength);
}
// Schedule all the tests.
let testNumber = 0;
for (let m = 0; m < mixingRulesList.length; ++m) {
let mixingRules = mixingRulesList[m];
for (let 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().then(buffer => {
checkResult(buffer, should);
task.done();
});
;
});
audit.run();
</script>
</body>
</html>
Codebase Browser
chromium