LayoutTests/webaudio/audionode-disconnect-audioparam.html - chromium/blink - Git at Google

 <!DOCTYPE html>
 <html>

 <head>
   <script src="../resources/js-test.js"></script>
   <script src="resources/compatibility.js"></script>
   <script src="resources/audio-testing.js"></script>
 </head>

 <body>
   <script>
     description('Test disconnect() method on AudioParam destination.');
     window.jsTestIsAsync = true;

     var audit = Audit.createTaskRunner();

     // The long render length (20 seconds) test 1 and 2 is to make sure the
     // |onstatechange| event gets fired to start the source, which can take
     // quite a bit of time.
     var testDuration = 20;

     // Task 1: test disconnect(AudioParam) method.
     audit.defineTask('disconnect(AudioParam)', function (done) {

       // Creates a buffer source with value [1] and then connect it to two gain
       // nodes in series. The output of the buffer source is lowered by half
       // (* 0.5) and then connected to two |.gain| AudioParams in each gain node.
       //  (1) bufferSource => gain1 => gain2
       //  (2) bufferSource => half => gain1.gain
       //  (3) half => gain2.gain
       // This graph should produce the output of 2.25 (= 1 * 1.5 * 1.5). After
       // disconnecting (3), it should produce 1.5.
       var context = new OfflineAudioContext(1, 44100 * testDuration, 44100);
       var source = context.createBufferSource();
       var buffer1ch = createTestingAudioBuffer(context, 1, 128);
       var half = context.createGain();
       var gain1 = context.createGain();
       var gain2 = context.createGain();

       source.buffer = buffer1ch;
       source.loop = true;
       half.gain.value = 0.5;

       source.connect(gain1);
       gain1.connect(gain2);
       gain2.connect(context.destination);
       source.connect(half);

       // Connecting |half| to both |gain1.gain| and |gain2.gain| amplifies the
       // signal by 2.25 (= 1.5 * 1.5) because each gain node amplifies the signal
       // by 1.5 (= 1.0 + 0.5).
       half.connect(gain1.gain);
       half.connect(gain2.gain);

       source.start();

       // Disconnects after the rendering starts.
       //
       // FIXME: Although this guarantees that the disconnection happens after
       // the rendering starts, still the actual disconnection might happen after
       // oncomplete event fired.
       //
       // The 10ms delay is 1/1000 of the total render length (10,000ms). Because
       // OfflineAudioContext runs faster than real time, the disconnection might
       // happen after the rendering finishes. Then lower the delay and increase
       // the render length to avoid the test failure.
       context.onstatechange = function () {
         if (context.state === 'running')
           half.disconnect(gain2.gain);
       };

       context.startRendering().then(function (buffer) {

         // Note that this test depends on the disconnection below to happen
         // sometime during rendering.

         // Expected values are: 1 * 1.5 * 1.5 -> 1 * 1.5 = [2.25, 1.5]
         Should('Channel #0', buffer.getChannelData(0)).containValues([2.25, 1.5]);

       }).then(done);
     });

     // Task 2: test disconnect(AudioParam, output) method.
     audit.defineTask('disconnect(AudioParam, output)', function (done) {

       // Create a 2-channel buffer source with [1, 2] in each channel and
       // make a serial connection through gain1 and gain 2. The make the buffer
       // source half with a gain node and connect it to a 2-output splitter.
       // Connect each output to 2 gain AudioParams respectively.
       //    (1) bufferSource => gain1 => gain2
       //    (2) bufferSource => half => splitter(2)
       //    (3) splitter#0 => gain1.gain
       //    (4) splitter#1 => gain2.gain
       // This graph should produce 3 (= 1 * 1.5 * 2) and 6 (= 2 * 1.5 * 2) for
       // each channel. After disconnecting (4), it should output 1.5 and 3.
       var context = new OfflineAudioContext(2, 44100 * testDuration, 44100);
       var source = context.createBufferSource();
       var buffer2ch = createTestingAudioBuffer(context, 2, 128);
       var splitter = context.createChannelSplitter(2);
       var half = context.createGain();
       var gain1 = context.createGain();
       var gain2 = context.createGain();

       source.buffer = buffer2ch;
       source.loop = true;
       half.gain.value = 0.5;

       source.connect(gain1);
       gain1.connect(gain2);
       gain2.connect(context.destination);

       // |source| originally is [1, 2] but it becomes [0.5, 1] after 0.5 gain.
       // Each splitter's output will be applied to |gain1.gain| and |gain2.gain|
       // respectively in an additive fashion.
       source.connect(half);
       half.connect(splitter);

       // This amplifies the signal by 1.5. (= 1.0 + 0.5)
       splitter.connect(gain1.gain, 0);

       // This amplifies the signal by 2. (= 1.0 + 1.0)
       splitter.connect(gain2.gain, 1);

       source.start();

       // Disconnect after the rendering starts. See the comment in the previous
       // test task.
       context.onstatechange = function () {
         if (context.state === 'running')
           splitter.disconnect(gain2.gain, 1);
       };

       context.startRendering().then(function (buffer) {

         // Expected values are: 1 * 1.5 * 2 -> 1 * 1.5 = [3, 1.5]
         Should('Channel #0', buffer.getChannelData(0)).containValues([3, 1.5]);

         // Expected values are: 2 * 1.5 * 2 -> 2 * 1.5 = [6, 3]
         Should('Channel #1', buffer.getChannelData(1)).containValues([6, 3]);

       }).then(done);
     });

     // Task 3: exception checks.
     audit.defineTask('exceptions', function (done) {
       var context = new AudioContext();
       var gain1 = context.createGain();
       var splitter = context.createChannelSplitter(2);
       var gain2 = context.createGain();
       var 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.gain, 0);
       splitter.connect(gain3.gain, 1);
       gain2.connect(gain3);
       gain3.connect(context.destination);

       // gain1 is not connected to gain3.gain. Exception should be thrown.
       Should('gain1.disconnect(gain3.gain)', function () {
         gain1.disconnect(gain3.gain);
       }).throw('InvalidAccessError');

       // When the output index is good but the destination is invalid.
       Should('splitter.disconnect(gain1.gain, 1)', function () {
         splitter.disconnect(gain1.gain, 1);
       }).throw('InvalidAccessError');

       // When both arguments are wrong, throw IndexSizeError first.
       Should('splitter.disconnect(gain1.gain, 2)', function () {
         splitter.disconnect(gain1.gain, 2);
       }).throw('IndexSizeError');

       done();
     });

     audit.defineTask('finish', function (done) {
       finishJSTest();
       done();
     });

     audit.runTasks(
       'disconnect(AudioParam)',
       'disconnect(AudioParam, output)',
       'exceptions',
       'finish'
     );

     successfullyParsed = true;
   </script>
 </body>

 </html>
	<!DOCTYPE html>
	<html>

	<head>
	<script src="../resources/js-test.js"></script>
	<script src="resources/compatibility.js"></script>
	<script src="resources/audio-testing.js"></script>
	</head>

	<body>
	<script>
	description('Test disconnect() method on AudioParam destination.');
	window.jsTestIsAsync = true;

	var audit = Audit.createTaskRunner();

	// The long render length (20 seconds) test 1 and 2 is to make sure the
	// \|onstatechange\| event gets fired to start the source, which can take
	// quite a bit of time.
	var testDuration = 20;

	// Task 1: test disconnect(AudioParam) method.
	audit.defineTask('disconnect(AudioParam)', function (done) {

	// Creates a buffer source with value [1] and then connect it to two gain
	// nodes in series. The output of the buffer source is lowered by half
	// (* 0.5) and then connected to two \|.gain\| AudioParams in each gain node.
	// (1) bufferSource => gain1 => gain2
	// (2) bufferSource => half => gain1.gain
	// (3) half => gain2.gain
	// This graph should produce the output of 2.25 (= 1 * 1.5 * 1.5). After
	// disconnecting (3), it should produce 1.5.
	var context = new OfflineAudioContext(1, 44100 * testDuration, 44100);
	var source = context.createBufferSource();
	var buffer1ch = createTestingAudioBuffer(context, 1, 128);
	var half = context.createGain();
	var gain1 = context.createGain();
	var gain2 = context.createGain();

	source.buffer = buffer1ch;
	source.loop = true;
	half.gain.value = 0.5;

	source.connect(gain1);
	gain1.connect(gain2);
	gain2.connect(context.destination);
	source.connect(half);

	// Connecting \|half\| to both \|gain1.gain\| and \|gain2.gain\| amplifies the
	// signal by 2.25 (= 1.5 * 1.5) because each gain node amplifies the signal
	// by 1.5 (= 1.0 + 0.5).
	half.connect(gain1.gain);
	half.connect(gain2.gain);

	source.start();

	// Disconnects after the rendering starts.
	//
	// FIXME: Although this guarantees that the disconnection happens after
	// the rendering starts, still the actual disconnection might happen after
	// oncomplete event fired.
	//
	// The 10ms delay is 1/1000 of the total render length (10,000ms). Because
	// OfflineAudioContext runs faster than real time, the disconnection might
	// happen after the rendering finishes. Then lower the delay and increase
	// the render length to avoid the test failure.
	context.onstatechange = function () {
	if (context.state === 'running')
	half.disconnect(gain2.gain);
	};

	context.startRendering().then(function (buffer) {

	// Note that this test depends on the disconnection below to happen
	// sometime during rendering.

	// Expected values are: 1 * 1.5 * 1.5 -> 1 * 1.5 = [2.25, 1.5]
	Should('Channel #0', buffer.getChannelData(0)).containValues([2.25, 1.5]);

	}).then(done);
	});

	// Task 2: test disconnect(AudioParam, output) method.
	audit.defineTask('disconnect(AudioParam, output)', function (done) {

	// Create a 2-channel buffer source with [1, 2] in each channel and
	// make a serial connection through gain1 and gain 2. The make the buffer
	// source half with a gain node and connect it to a 2-output splitter.
	// Connect each output to 2 gain AudioParams respectively.
	// (1) bufferSource => gain1 => gain2
	// (2) bufferSource => half => splitter(2)
	// (3) splitter#0 => gain1.gain
	// (4) splitter#1 => gain2.gain
	// This graph should produce 3 (= 1 * 1.5 * 2) and 6 (= 2 * 1.5 * 2) for
	// each channel. After disconnecting (4), it should output 1.5 and 3.
	var context = new OfflineAudioContext(2, 44100 * testDuration, 44100);
	var source = context.createBufferSource();
	var buffer2ch = createTestingAudioBuffer(context, 2, 128);
	var splitter = context.createChannelSplitter(2);
	var half = context.createGain();
	var gain1 = context.createGain();
	var gain2 = context.createGain();

	source.buffer = buffer2ch;
	source.loop = true;
	half.gain.value = 0.5;

	source.connect(gain1);
	gain1.connect(gain2);
	gain2.connect(context.destination);

	// \|source\| originally is [1, 2] but it becomes [0.5, 1] after 0.5 gain.
	// Each splitter's output will be applied to \|gain1.gain\| and \|gain2.gain\|
	// respectively in an additive fashion.
	source.connect(half);
	half.connect(splitter);

	// This amplifies the signal by 1.5. (= 1.0 + 0.5)
	splitter.connect(gain1.gain, 0);

	// This amplifies the signal by 2. (= 1.0 + 1.0)
	splitter.connect(gain2.gain, 1);

	source.start();

	// Disconnect after the rendering starts. See the comment in the previous
	// test task.
	context.onstatechange = function () {
	if (context.state === 'running')
	splitter.disconnect(gain2.gain, 1);
	};

	context.startRendering().then(function (buffer) {

	// Expected values are: 1 * 1.5 * 2 -> 1 * 1.5 = [3, 1.5]
	Should('Channel #0', buffer.getChannelData(0)).containValues([3, 1.5]);

	// Expected values are: 2 * 1.5 * 2 -> 2 * 1.5 = [6, 3]
	Should('Channel #1', buffer.getChannelData(1)).containValues([6, 3]);

	}).then(done);
	});

	// Task 3: exception checks.
	audit.defineTask('exceptions', function (done) {
	var context = new AudioContext();
	var gain1 = context.createGain();
	var splitter = context.createChannelSplitter(2);
	var gain2 = context.createGain();
	var 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.gain, 0);
	splitter.connect(gain3.gain, 1);
	gain2.connect(gain3);
	gain3.connect(context.destination);

	// gain1 is not connected to gain3.gain. Exception should be thrown.
	Should('gain1.disconnect(gain3.gain)', function () {
	gain1.disconnect(gain3.gain);
	}).throw('InvalidAccessError');

	// When the output index is good but the destination is invalid.
	Should('splitter.disconnect(gain1.gain, 1)', function () {
	splitter.disconnect(gain1.gain, 1);
	}).throw('InvalidAccessError');

	// When both arguments are wrong, throw IndexSizeError first.
	Should('splitter.disconnect(gain1.gain, 2)', function () {
	splitter.disconnect(gain1.gain, 2);
	}).throw('IndexSizeError');

	done();
	});

	audit.defineTask('finish', function (done) {
	finishJSTest();
	done();
	});

	audit.runTasks(
	'disconnect(AudioParam)',
	'disconnect(AudioParam, output)',
	'exceptions',
	'finish'
	);

	successfullyParsed = true;
	</script>
	</body>

	</html>