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audionode-disconnect.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">
let audit = Audit.createTaskRunner();
// Task 1: test disconnect() method.
audit.define('disconnect()', (task, should) => {
// Connect a source to multiple gain nodes, each connected to the
// destination. Then disconnect the source. The expected output should
// be all zeros since the source was disconnected.
let context = new OfflineAudioContext(1, 128, 44100);
let source = context.createBufferSource();
let buffer1ch = createConstantBuffer(context, 128, [1]);
let gain1 = context.createGain();
let gain2 = context.createGain();
let gain3 = context.createGain();
source.buffer = buffer1ch;
source.connect(gain1);
source.connect(gain2);
source.connect(gain3);
gain1.connect(context.destination);
gain2.connect(context.destination);
gain3.connect(context.destination);
source.start();
// This disconnects everything.
source.disconnect();
context.startRendering()
.then(function(buffer) {
// With everything disconnected, the result should be zero.
should(buffer.getChannelData(0), 'Channel #0')
.beConstantValueOf(0);
})
.then(() => task.done());
});
// Task 2: test disconnect(output) method.
audit.define('disconnect(output)', (task, should) => {
// Create multiple connections from each output of a ChannelSplitter
// to a gain node. Then test if disconnecting a single output of
// splitter is actually disconnected.
let context = new OfflineAudioContext(1, 128, 44100);
let source = context.createBufferSource();
let buffer3ch = createConstantBuffer(context, 128, [1, 2, 3]);
let splitter = context.createChannelSplitter(3);
let sum = context.createGain();
source.buffer = buffer3ch;
source.connect(splitter);
splitter.connect(sum, 0);
splitter.connect(sum, 1);
splitter.connect(sum, 2);
sum.connect(context.destination);
source.start();
// This disconnects the second output.
splitter.disconnect(1);
context.startRendering()
.then(function(buffer) {
// The rendered channel should contain 4. (= 1 + 0 + 3)
should(buffer.getChannelData(0), 'Channel #0')
.beConstantValueOf(4);
})
.then(() => task.done());
});
// Task 3: test disconnect(AudioNode) method.
audit.define('disconnect(AudioNode)', (task, should) => {
// Connect a source to multiple gain nodes. Then test if disconnecting a
// single destination selectively works correctly.
let context = new OfflineAudioContext(1, 128, 44100);
let source = context.createBufferSource();
let buffer1ch = createConstantBuffer(context, 128, [1]);
let gain1 = context.createGain();
let gain2 = context.createGain();
let gain3 = context.createGain();
let orphan = context.createGain();
source.buffer = buffer1ch;
source.connect(gain1);
source.connect(gain2);
source.connect(gain3);
gain1.connect(context.destination);
gain2.connect(context.destination);
gain3.connect(context.destination);
source.start();
source.disconnect(gain2);
context.startRendering()
.then(function(buffer) {
// The |sum| gain node should produce value 2. (1 + 0 + 1 = 2)
should(buffer.getChannelData(0), 'Channel #0')
.beConstantValueOf(2);
})
.then(() => task.done());
});
// Task 4: test disconnect(AudioNode, output) method.
audit.define('disconnect(AudioNode, output)', (task, should) => {
// Connect a buffer with 2 channels with each containing 1 and 2
// respectively to a ChannelSplitter, then connect the splitter to 2
// gain nodes as shown below:
// (1) splitter#0 => gain1
// (2) splitter#0 => gain2
// (3) splitter#1 => gain2
// Then disconnect (2) and verify if the selective disconnection on a
// specified output of the destination node works correctly.
let context = new OfflineAudioContext(1, 128, 44100);
let source = context.createBufferSource();
let buffer2ch = createConstantBuffer(context, 128, [1, 2]);
let splitter = context.createChannelSplitter(2);
let gain1 = context.createGain();
let gain2 = context.createGain();
source.buffer = buffer2ch;
source.connect(splitter);
splitter.connect(gain1, 0); // gain1 gets channel 0.
splitter.connect(gain2, 0); // gain2 sums channel 0 and 1.
splitter.connect(gain2, 1);
gain1.connect(context.destination);
gain2.connect(context.destination);
source.start();
splitter.disconnect(gain2, 0); // Now gain2 gets [2]
context.startRendering()
.then(function(buffer) {
// The sum of gain1 and gain2 should produce value 3. (= 1 + 2)
should(buffer.getChannelData(0), 'Channel #0')
.beConstantValueOf(3);
})
.then(() => task.done());
});
// Task 5: test disconnect(AudioNode, output, input) method.
audit.define('disconnect(AudioNode, output, input)', (task, should) => {
// Create a 3-channel buffer with [1, 2, 3] in each channel and then
// pass it through a splitter and a merger. Each input/output of the
// splitter and the merger is connected in a sequential order as shown
// below.
// (1) splitter#0 => merger#0
// (2) splitter#1 => merger#1
// (3) splitter#2 => merger#2
// Then disconnect (3) and verify if each channel contains [1] and [2]
// respectively.
let context = new OfflineAudioContext(3, 128, 44100);
let source = context.createBufferSource();
let buffer3ch = createConstantBuffer(context, 128, [1, 2, 3]);
let splitter = context.createChannelSplitter(3);
let merger = context.createChannelMerger(3);
source.buffer = buffer3ch;
source.connect(splitter);
splitter.connect(merger, 0, 0);
splitter.connect(merger, 1, 1);
splitter.connect(merger, 2, 2);
merger.connect(context.destination);
source.start();
splitter.disconnect(merger, 2, 2);
context.startRendering()
.then(function(buffer) {
// Each channel should have 1, 2, and 0 respectively.
should(buffer.getChannelData(0), 'Channel #0')
.beConstantValueOf(1);
should(buffer.getChannelData(1), 'Channel #1')
.beConstantValueOf(2);
should(buffer.getChannelData(2), 'Channel #2')
.beConstantValueOf(0);
})
.then(() => task.done());
});
// Task 6: exception checks.
audit.define('exceptions', (task, should) => {
let context = new OfflineAudioContext(2, 128, 44100);
let gain1 = context.createGain();
let splitter = context.createChannelSplitter(2);
let merger = context.createChannelMerger(2);
let gain2 = context.createGain();
let gain3 = context.createGain();
// Connect a splitter to gain nodes and merger so we can test the
// possible ways of disconnecting the nodes to verify that appropriate
// exceptions are thrown.
gain1.connect(splitter);
splitter.connect(gain2, 0);
splitter.connect(gain3, 1);
splitter.connect(merger, 0, 0);
splitter.connect(merger, 1, 1);
gain2.connect(gain3);
gain3.connect(context.destination);
merger.connect(context.destination);
// There is no output #2. An exception should be thrown.
should(function() {
splitter.disconnect(2);
}, 'splitter.disconnect(2)').throw(DOMException, 'IndexSizeError');
// Disconnecting the output already disconnected should not throw.
should(function() {
splitter.disconnect(1);
splitter.disconnect(1);
}, 'Disconnecting a connection twice').notThrow();
// gain1 is not connected gain2. An exception should be thrown.
should(function() {
gain1.disconnect(gain2);
}, 'gain1.disconnect(gain2)').throw(DOMException, 'InvalidAccessError');
// gain1 and gain3 are not connected. An exception should be thrown.
should(function() {
gain1.disconnect(gain3);
}, 'gain1.disconnect(gain3)').throw(DOMException, 'InvalidAccessError');
// There is no output #2 in the splitter. An exception should be thrown.
should(function() {
splitter.disconnect(gain2, 2);
}, 'splitter.disconnect(gain2, 2)').throw(DOMException, 'IndexSizeError');
// The splitter and gain1 are not connected. An exception should be
// thrown.
should(function() {
splitter.disconnect(gain1, 0);
}, 'splitter.disconnect(gain1, 0)').throw(DOMException, 'InvalidAccessError');
// The splitter output #0 and the gain3 output #0 are not connected. An
// exception should be thrown.
should(function() {
splitter.disconnect(gain3, 0, 0);
}, 'splitter.disconnect(gain3, 0, 0)').throw(DOMException, 'InvalidAccessError');
// The output index is out of bound. An exception should be thrown.
should(function() {
splitter.disconnect(merger, 3, 0);
}, 'splitter.disconnect(merger, 3, 0)').throw(DOMException, 'IndexSizeError');
task.done();
});
audit.define('disabled-outputs', (task, should) => {
// See crbug.com/656652
let context = new OfflineAudioContext(2, 1024, 44100);
let g1 = context.createGain();
let g2 = context.createGain();
g1.connect(g2);
g1.disconnect(g2);
let g3 = context.createGain();
g2.connect(g3);
g1.connect(g2);
context.startRendering()
.then(function() {
// If we make it here, we passed.
should(true, 'Disabled outputs handled')
.message('correctly', 'inccorrectly');
})
.then(() => task.done());
});
audit.run();
</script>
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