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audionode-connect-method-chaining.html
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<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>
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<script id="layout-test-code">
// AudioNode dictionary with associated arguments.
let nodeDictionary = [
{name: 'Analyser'}, {name: 'BiquadFilter'}, {name: 'BufferSource'},
{name: 'ChannelMerger', args: [6]},
{name: 'ChannelSplitter', args: [6]}, {name: 'Convolver'},
{name: 'Delay', args: []}, {name: 'DynamicsCompressor'}, {name: 'Gain'},
{name: 'Oscillator'}, {name: 'Panner'},
{name: 'ScriptProcessor', args: [512, 1, 1]}, {name: 'StereoPanner'},
{name: 'WaveShaper'}
];
function verifyReturnedNode(should, config) {
should(
config.destination === config.returned,
'The return value of ' + config.desc + ' matches the destination ' +
config.returned.constructor.name)
.beEqualTo(true);
}
// Test utility for batch method checking: in order to test 3 method
// signatures, so we create 3 dummy destinations.
// 1) .connect(GainNode)
// 2) .connect(BiquadFilterNode, output)
// 3) .connect(ChannelMergerNode, output, input)
function testConnectMethod(context, should, options) {
let source =
context['create' + options.name].apply(context, options.args);
let sourceName = source.constructor.name;
let destination1 = context.createGain();
verifyReturnedNode(should, {
source: source,
destination: destination1,
returned: source.connect(destination1),
desc: sourceName + '.connect(' + destination1.constructor.name + ')'
});
let destination2 = context.createBiquadFilter();
verifyReturnedNode(should, {
source: source,
destination: destination2,
returned: source.connect(destination2, 0),
desc:
sourceName + '.connect(' + destination2.constructor.name + ', 0)'
});
let destination3 = context.createChannelMerger();
verifyReturnedNode(should, {
source: source,
destination: destination3,
returned: source.connect(destination3, 0, 1),
desc: sourceName + '.connect(' + destination3.constructor.name +
', 0, 1)'
});
}
let audit = Audit.createTaskRunner();
// Task: testing entries from the dictionary.
audit.define('from-dictionary', (task, should) => {
let context = new AudioContext();
for (let i = 0; i < nodeDictionary.length; i++)
testConnectMethod(context, should, nodeDictionary[i]);
task.done();
});
// Task: testing Media* nodes.
audit.define('media-group', (task, should) => {
let context = new AudioContext();
// Test MediaElementSourceNode needs an <audio> element.
let mediaElement = document.createElement('audio');
testConnectMethod(
context, should,
{name: 'MediaElementSource', args: [mediaElement]});
// MediaStreamAudioDestinationNode has no output so it connect method
// chaining isn't possible.
// MediaStreamSourceNode requires 'stream' object to be constructed,
// which is a part of MediaStreamDestinationNode.
let streamDestination = context.createMediaStreamDestination();
let stream = streamDestination.stream;
testConnectMethod(
context, should, {name: 'MediaStreamSource', args: [stream]});
task.done();
});
// Task: test the exception thrown by invalid operation.
audit.define('invalid-operation', (task, should) => {
let contextA = new AudioContext();
let contextB = new AudioContext();
let gain1 = contextA.createGain();
let gain2 = contextA.createGain();
// Test if the first connection throws correctly. The first gain node
// does not have the second output, so it should throw.
should(function() {
gain1.connect(gain2, 1).connect(contextA.destination);
}, 'Connecting with an invalid output').throw(DOMException, 'IndexSizeError');
// Test if the second connection throws correctly. The contextB's
// destination is not compatible with the nodes from contextA, thus the
// first connection succeeds but the second one should throw.
should(
function() {
gain1.connect(gain2).connect(contextB.destination);
},
'Connecting to a node from the different context')
.throw(DOMException, 'InvalidAccessError');
task.done();
});
// Task: verify if the method chaining actually works.
audit.define('verification', (task, should) => {
// We pick the lowest sample rate allowed to run the test efficiently.
let context = new OfflineAudioContext(1, 128, 8000);
let constantBuffer = createConstantBuffer(context, 1, 1.0);
let source = context.createBufferSource();
source.buffer = constantBuffer;
source.loop = true;
let gain1 = context.createGain();
gain1.gain.value = 0.5;
let gain2 = context.createGain();
gain2.gain.value = 0.25;
source.connect(gain1).connect(gain2).connect(context.destination);
source.start();
context.startRendering()
.then(function(buffer) {
should(
buffer.getChannelData(0),
'The output of chained connection of gain nodes')
.beConstantValueOf(0.125);
})
.then(() => task.done());
});
audit.run();
</script>
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