LibWeb/WebAudio: Manage channelCountMode and channelCount for PannerNode

Author: https://github.com/shlyakpavel
Commit: https://github.com/LadybirdBrowser/ladybird/commit/884599f1df4
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2944
Reviewed-by: https://github.com/gmta

Tests/LibWeb/Text/input/wpt-import/webaudio/resources/audionodeoptions.js

@@ -0,0 +1,292 @@
+// Test that constructor for the node with name |nodeName| handles the
+// various possible values for channelCount, channelCountMode, and
+// channelInterpretation.
+
+// The |should| parameter is the test function from new |Audit|.
+function testAudioNodeOptions(should, context, nodeName, expectedNodeOptions) {
+  if (expectedNodeOptions === undefined)
+    expectedNodeOptions = {};
+  let node;
+
+  // Test that we can set channelCount and that errors are thrown for
+  // invalid values
+  let testChannelCount = 17;
+  if (expectedNodeOptions.channelCount) {
+    testChannelCount = expectedNodeOptions.channelCount.value;
+  }
+  should(
+      () => {
+        node = new window[nodeName](
+            context, Object.assign({}, expectedNodeOptions.additionalOptions, {
+              channelCount: testChannelCount
+            }));
+      },
+      'new ' + nodeName + '(c, {channelCount: ' + testChannelCount + '})')
+      .notThrow();
+  should(node.channelCount, 'node.channelCount').beEqualTo(testChannelCount);
+
+  if (expectedNodeOptions.channelCount &&
+      expectedNodeOptions.channelCount.isFixed) {
+    // The channel count is fixed.  Verify that we throw an error if
+    // we try to change it. Arbitrarily set the count to be one more
+    // than the expected value.
+    testChannelCount = expectedNodeOptions.channelCount.value + 1;
+    should(
+        () => {
+          node = new window[nodeName](
+              context,
+              Object.assign(
+                  {}, expectedNodeOptions.additionalOptions,
+                  {channelCount: testChannelCount}));
+        },
+        'new ' + nodeName + '(c, {channelCount: ' + testChannelCount + '})')
+        .throw(DOMException,
+               expectedNodeOptions.channelCount.exceptionType);
+    // And test that setting it to the fixed value does not throw.
+    testChannelCount = expectedNodeOptions.channelCount.value;
+    should(
+        () => {
+          node = new window[nodeName](
+              context,
+              Object.assign(
+                  {}, expectedNodeOptions.additionalOptions,
+                  {channelCount: testChannelCount}));
+          node.channelCount = testChannelCount;
+        },
+        '(new ' + nodeName + '(c, {channelCount: ' + testChannelCount + '})).channelCount = ' + testChannelCount)
+        .notThrow();
+  } else {
+    // The channel count is not fixed.  Try to set the count to invalid
+    // values and make sure an error is thrown.
+    [0, 99].forEach(testValue => {
+      should(() => {
+        node = new window[nodeName](
+            context, Object.assign({}, expectedNodeOptions.additionalOptions, {
+              channelCount: testValue
+            }));
+      }, `new ${nodeName}(c, {channelCount: ${testValue}})`)
+          .throw(DOMException, 'NotSupportedError');
+    });
+  }
+
+  // Test channelCountMode
+  let testChannelCountMode = 'max';
+  if (expectedNodeOptions.channelCountMode) {
+    testChannelCountMode = expectedNodeOptions.channelCountMode.value;
+  }
+  should(
+      () => {
+        node = new window[nodeName](
+            context, Object.assign({}, expectedNodeOptions.additionalOptions, {
+              channelCountMode: testChannelCountMode
+            }));
+      },
+      'new ' + nodeName + '(c, {channelCountMode: "' + testChannelCountMode +
+          '"}')
+      .notThrow();
+  should(node.channelCountMode, 'node.channelCountMode')
+      .beEqualTo(testChannelCountMode);
+
+  if (expectedNodeOptions.channelCountMode &&
+      expectedNodeOptions.channelCountMode.isFixed) {
+    // Channel count mode is fixed.  Test setting to something else throws.
+    ['max', 'clamped-max', 'explicit'].forEach(testValue => {
+      if (testValue !== expectedNodeOptions.channelCountMode.value) {
+        should(
+            () => {
+              node = new window[nodeName](
+                  context,
+                  Object.assign(
+                      {}, expectedNodeOptions.additionalOptions,
+                      {channelCountMode: testValue}));
+            },
+            `new ${nodeName}(c, {channelCountMode: "${testValue}"})`)
+            .throw(DOMException,
+                   expectedNodeOptions.channelCountMode.exceptionType);
+      } else {
+        // Test that explicitly setting the the fixed value is allowed.
+        should(
+            () => {
+              node = new window[nodeName](
+                  context,
+                  Object.assign(
+                      {}, expectedNodeOptions.additionalOptions,
+                      {channelCountMode: testValue}));
+              node.channelCountMode = testValue;
+            },
+            `(new ${nodeName}(c, {channelCountMode: "${testValue}"})).channelCountMode = "${testValue}"`)
+            .notThrow();
+      }
+    });
+  } else {
+    // Mode is not fixed. Verify that we can set the mode to all valid
+    // values, and that we throw for invalid values.
+
+    let testValues = ['max', 'clamped-max', 'explicit'];
+
+    testValues.forEach(testValue => {
+      should(() => {
+        node = new window[nodeName](
+            context, Object.assign({}, expectedNodeOptions.additionalOptions, {
+              channelCountMode: testValue
+            }));
+      }, `new ${nodeName}(c, {channelCountMode: "${testValue}"})`).notThrow();
+      should(
+          node.channelCountMode, 'node.channelCountMode after valid setter')
+          .beEqualTo(testValue);
+
+    });
+
+    should(
+        () => {
+          node = new window[nodeName](
+              context,
+              Object.assign(
+                  {}, expectedNodeOptions.additionalOptions,
+                  {channelCountMode: 'foobar'}));
+        },
+        'new ' + nodeName + '(c, {channelCountMode: "foobar"}')
+        .throw(TypeError);
+    should(node.channelCountMode, 'node.channelCountMode after invalid setter')
+        .beEqualTo(testValues[testValues.length - 1]);
+  }
+
+  // Test channelInterpretation
+  if (expectedNodeOptions.channelInterpretation &&
+      expectedNodeOptions.channelInterpretation.isFixed) {
+    // The channel interpretation is fixed.  Verify that we throw an
+    // error if we try to change it.
+    ['speakers', 'discrete'].forEach(testValue => {
+      if (testValue !== expectedNodeOptions.channelInterpretation.value) {
+        should(
+            () => {
+              node = new window[nodeName](
+                  context,
+                  Object.assign(
+                      {}, expectedNodeOptions.additionOptions,
+                      {channelInterpretation: testValue}));
+            },
+            `new ${nodeName}(c, {channelInterpretation: "${testValue}"})`)
+            .throw(DOMException,
+                   expectedNodeOptions.channelCountMode.exceptionType);
+      } else {
+        // Check that assigning the fixed value is OK.
+        should(
+            () => {
+              node = new window[nodeName](
+                  context,
+                  Object.assign(
+                      {}, expectedNodeOptions.additionOptions,
+                      {channelInterpretation: testValue}));
+              node.channelInterpretation = testValue;
+            },
+            `(new ${nodeName}(c, {channelInterpretation: "${testValue}"})).channelInterpretation = "${testValue}"`)
+            .notThrow();
+      }
+    });
+  } else {
+    // Channel interpretation is not fixed. Verify that we can set it
+    // to all possible values.
+    should(
+        () => {
+          node = new window[nodeName](
+              context,
+              Object.assign(
+                  {}, expectedNodeOptions.additionalOptions,
+                  {channelInterpretation: 'speakers'}));
+        },
+        'new ' + nodeName + '(c, {channelInterpretation: "speakers"})')
+        .notThrow();
+    should(node.channelInterpretation, 'node.channelInterpretation')
+        .beEqualTo('speakers');
+
+    should(
+        () => {
+          node = new window[nodeName](
+              context,
+              Object.assign(
+                  {}, expectedNodeOptions.additionalOptions,
+                  {channelInterpretation: 'discrete'}));
+        },
+        'new ' + nodeName + '(c, {channelInterpretation: "discrete"})')
+        .notThrow();
+    should(node.channelInterpretation, 'node.channelInterpretation')
+        .beEqualTo('discrete');
+
+    should(
+        () => {
+          node = new window[nodeName](
+              context,
+              Object.assign(
+                  {}, expectedNodeOptions.additionalOptions,
+                  {channelInterpretation: 'foobar'}));
+        },
+        'new ' + nodeName + '(c, {channelInterpretation: "foobar"})')
+        .throw(TypeError);
+    should(
+        node.channelInterpretation,
+        'node.channelInterpretation after invalid setter')
+        .beEqualTo('discrete');
+  }
+}
+
+function initializeContext(should) {
+  let c;
+  should(() => {
+    c = new OfflineAudioContext(1, 1, 48000);
+  }, 'context = new OfflineAudioContext(...)').notThrow();
+
+  return c;
+}
+
+function testInvalidConstructor(should, name, context) {
+  should(() => {
+    new window[name]();
+  }, 'new ' + name + '()').throw(TypeError);
+  should(() => {
+    new window[name](1);
+  }, 'new ' + name + '(1)').throw(TypeError);
+  should(() => {
+    new window[name](context, 42);
+  }, 'new ' + name + '(context, 42)').throw(TypeError);
+}
+
+function testDefaultConstructor(should, name, context, options) {
+  let node;
+
+  let message = options.prefix + ' = new ' + name + '(context';
+  if (options.constructorOptions)
+    message += ', ' + JSON.stringify(options.constructorOptions);
+  message += ')'
+
+  should(() => {
+    node = new window[name](context, options.constructorOptions);
+  }, message).notThrow();
+
+  should(node instanceof window[name], options.prefix + ' instanceof ' + name)
+      .beEqualTo(true);
+  should(node.numberOfInputs, options.prefix + '.numberOfInputs')
+      .beEqualTo(options.numberOfInputs);
+  should(node.numberOfOutputs, options.prefix + '.numberOfOutputs')
+      .beEqualTo(options.numberOfOutputs);
+  should(node.channelCount, options.prefix + '.channelCount')
+      .beEqualTo(options.channelCount);
+  should(node.channelCountMode, options.prefix + '.channelCountMode')
+      .beEqualTo(options.channelCountMode);
+  should(node.channelInterpretation, options.prefix + '.channelInterpretation')
+      .beEqualTo(options.channelInterpretation);
+
+  return node;
+}
+
+function testDefaultAttributes(should, node, prefix, items) {
+  items.forEach((item) => {
+    let attr = node[item.name];
+    if (attr instanceof AudioParam) {
+      should(attr.value, prefix + '.' + item.name + '.value')
+          .beEqualTo(item.value);
+    } else {
+      should(attr, prefix + '.' + item.name).beEqualTo(item.value);
+    }
+  });
+}

Tests/LibWeb/Text/input/wpt-import/webaudio/resources/audit-util.js

@@ -0,0 +1,195 @@
+// Copyright 2016 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+
+/**
+ * @fileOverview  This file includes legacy utility functions for the layout
+ *                test.
+ */
+
+// How many frames in a WebAudio render quantum.
+let RENDER_QUANTUM_FRAMES = 128;
+
+// Compare two arrays (commonly extracted from buffer.getChannelData()) with
+// constraints:
+//   options.thresholdSNR: Minimum allowed SNR between the actual and expected
+//     signal. The default value is 10000.
+//   options.thresholdDiffULP: Maximum allowed difference between the actual
+//     and expected signal in ULP(Unit in the last place). The default is 0.
+//   options.thresholdDiffCount: Maximum allowed number of sample differences
+//     which exceeds the threshold. The default is 0.
+//   options.bitDepth: The expected result is assumed to come from an audio
+//     file with this number of bits of precision. The default is 16.
+function compareBuffersWithConstraints(should, actual, expected, options) {
+  if (!options)
+    options = {};
+
+  // Only print out the message if the lengths are different; the
+  // expectation is that they are the same, so don't clutter up the
+  // output.
+  if (actual.length !== expected.length) {
+    should(
+        actual.length === expected.length,
+        'Length of actual and expected buffers should match')
+        .beTrue();
+  }
+
+  let maxError = -1;
+  let diffCount = 0;
+  let errorPosition = -1;
+  let thresholdSNR = (options.thresholdSNR || 10000);
+
+  let thresholdDiffULP = (options.thresholdDiffULP || 0);
+  let thresholdDiffCount = (options.thresholdDiffCount || 0);
+
+  // By default, the bit depth is 16.
+  let bitDepth = (options.bitDepth || 16);
+  let scaleFactor = Math.pow(2, bitDepth - 1);
+
+  let noisePower = 0, signalPower = 0;
+
+  for (let i = 0; i < actual.length; i++) {
+    let diff = actual[i] - expected[i];
+    noisePower += diff * diff;
+    signalPower += expected[i] * expected[i];
+
+    if (Math.abs(diff) > maxError) {
+      maxError = Math.abs(diff);
+      errorPosition = i;
+    }
+
+    // The reference file is a 16-bit WAV file, so we will almost never get
+    // an exact match between it and the actual floating-point result.
+    if (Math.abs(diff) > scaleFactor)
+      diffCount++;
+  }
+
+  let snr = 10 * Math.log10(signalPower / noisePower);
+  let maxErrorULP = maxError * scaleFactor;
+
+  should(snr, 'SNR').beGreaterThanOrEqualTo(thresholdSNR);
+
+  should(
+      maxErrorULP,
+      options.prefix + ': Maximum difference (in ulp units (' + bitDepth +
+          '-bits))')
+      .beLessThanOrEqualTo(thresholdDiffULP);
+
+  should(diffCount, options.prefix + ': Number of differences between results')
+      .beLessThanOrEqualTo(thresholdDiffCount);
+}
+
+// Create an impulse in a buffer of length sampleFrameLength
+function createImpulseBuffer(context, sampleFrameLength) {
+  let audioBuffer =
+      context.createBuffer(1, sampleFrameLength, context.sampleRate);
+  let n = audioBuffer.length;
+  let dataL = audioBuffer.getChannelData(0);
+
+  for (let k = 0; k < n; ++k) {
+    dataL[k] = 0;
+  }
+  dataL[0] = 1;
+
+  return audioBuffer;
+}
+
+// Create a buffer of the given length with a linear ramp having values 0 <= x <
+// 1.
+function createLinearRampBuffer(context, sampleFrameLength) {
+  let audioBuffer =
+      context.createBuffer(1, sampleFrameLength, context.sampleRate);
+  let n = audioBuffer.length;
+  let dataL = audioBuffer.getChannelData(0);
+
+  for (let i = 0; i < n; ++i)
+    dataL[i] = i / n;
+
+  return audioBuffer;
+}
+
+// Create an AudioBuffer of length |sampleFrameLength| having a constant value
+// |constantValue|. If |constantValue| is a number, the buffer has one channel
+// filled with that value. If |constantValue| is an array, the buffer is created
+// wit a number of channels equal to the length of the array, and channel k is
+// filled with the k'th element of the |constantValue| array.
+function createConstantBuffer(context, sampleFrameLength, constantValue) {
+  let channels;
+  let values;
+
+  if (typeof constantValue === 'number') {
+    channels = 1;
+    values = [constantValue];
+  } else {
+    channels = constantValue.length;
+    values = constantValue;
+  }
+
+  let audioBuffer =
+      context.createBuffer(channels, sampleFrameLength, context.sampleRate);
+  let n = audioBuffer.length;
+
+  for (let c = 0; c < channels; ++c) {
+    let data = audioBuffer.getChannelData(c);
+    for (let i = 0; i < n; ++i)
+      data[i] = values[c];
+  }
+
+  return audioBuffer;
+}
+
+// Create a stereo impulse in a buffer of length sampleFrameLength
+function createStereoImpulseBuffer(context, sampleFrameLength) {
+  let audioBuffer =
+      context.createBuffer(2, sampleFrameLength, context.sampleRate);
+  let n = audioBuffer.length;
+  let dataL = audioBuffer.getChannelData(0);
+  let dataR = audioBuffer.getChannelData(1);
+
+  for (let k = 0; k < n; ++k) {
+    dataL[k] = 0;
+    dataR[k] = 0;
+  }
+  dataL[0] = 1;
+  dataR[0] = 1;
+
+  return audioBuffer;
+}
+
+// Convert time (in seconds) to sample frames.
+function timeToSampleFrame(time, sampleRate) {
+  return Math.floor(0.5 + time * sampleRate);
+}
+
+// Compute the number of sample frames consumed by noteGrainOn with
+// the specified |grainOffset|, |duration|, and |sampleRate|.
+function grainLengthInSampleFrames(grainOffset, duration, sampleRate) {
+  let startFrame = timeToSampleFrame(grainOffset, sampleRate);
+  let endFrame = timeToSampleFrame(grainOffset + duration, sampleRate);
+
+  return endFrame - startFrame;
+}
+
+// True if the number is not an infinity or NaN
+function isValidNumber(x) {
+  return !isNaN(x) && (x != Infinity) && (x != -Infinity);
+}
+
+// Compute the (linear) signal-to-noise ratio between |actual| and
+// |expected|.  The result is NOT in dB!  If the |actual| and
+// |expected| have different lengths, the shorter length is used.
+function computeSNR(actual, expected) {
+  let signalPower = 0;
+  let noisePower = 0;
+
+  let length = Math.min(actual.length, expected.length);
+
+  for (let k = 0; k < length; ++k) {
+    let diff = actual[k] - expected[k];
+    signalPower += expected[k] * expected[k];
+    noisePower += diff * diff;
+  }
+
+  return signalPower / noisePower;
+}

Tests/LibWeb/Text/input/wpt-import/webaudio/the-audio-api/the-pannernode-interface/ctor-panner.html

@@ -0,0 +1,468 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>
+      Test Constructor: Panner
+    </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/audionodeoptions.js"></script>
+  </head>
+  <body>
+    <script id="layout-test-code">
+      let context;
+
+      let audit = Audit.createTaskRunner();
+
+      audit.define('initialize', (task, should) => {
+        context = initializeContext(should);
+        task.done();
+      });
+
+      audit.define('invalid constructor', (task, should) => {
+        testInvalidConstructor(should, 'PannerNode', context);
+        task.done();
+      });
+
+      audit.define('default constructor', (task, should) => {
+        let prefix = 'node0';
+        let node = testDefaultConstructor(should, 'PannerNode', context, {
+          prefix: prefix,
+          numberOfInputs: 1,
+          numberOfOutputs: 1,
+          channelCount: 2,
+          channelCountMode: 'clamped-max',
+          channelInterpretation: 'speakers'
+        });
+
+        testDefaultAttributes(should, node, prefix, [
+          {name: 'panningModel', value: 'equalpower'},
+          {name: 'positionX', value: 0}, {name: 'positionY', value: 0},
+          {name: 'positionZ', value: 0}, {name: 'orientationX', value: 1},
+          {name: 'orientationY', value: 0}, {name: 'orientationZ', value: 0},
+          {name: 'distanceModel', value: 'inverse'},
+          {name: 'refDistance', value: 1}, {name: 'maxDistance', value: 10000},
+          {name: 'rolloffFactor', value: 1},
+          {name: 'coneInnerAngle', value: 360},
+          {name: 'coneOuterAngle', value: 360},
+          {name: 'coneOuterGain', value: 0}
+        ]);
+
+        // Test the listener too, while we're at it.
+        let listenerAttributes = [
+          {name: 'positionX', value: 0},
+          {name: 'positionY', value: 0},
+          {name: 'positionZ', value: 0},
+          {name: 'forwardX', value: 0},
+          {name: 'forwardY', value: 0},
+          {name: 'forwardZ', value: -1},
+          {name: 'upX', value: 0},
+          {name: 'upY', value: 1},
+          {name: 'upZ', value: 0},
+        ];
+
+        listenerAttributes.forEach((item) => {
+          should(
+              context.listener[item.name].value,
+              'context.listener.' + item.name + '.value')
+              .beEqualTo(item.value);
+        });
+
+        task.done();
+      });
+
+      audit.define('test AudioNodeOptions', (task, should) => {
+        // Can't use testAudioNodeOptions because the constraints for this node
+        // are not supported there.
+        let node;
+        let success = true;
+
+        // Test that we can set the channel count to 1 or 2.
+        let options = {channelCount: 1};
+        should(
+            () => {
+              node = new PannerNode(context, options);
+            },
+            'node1 = new PannerNode(c, ' + JSON.stringify(options) + ')')
+            .notThrow();
+        should(node.channelCount, 'node1.channelCount')
+            .beEqualTo(options.channelCount);
+
+        options = {channelCount: 2};
+        should(
+            () => {
+              node = new PannerNode(context, options);
+            },
+            'node2 = new PannerNode(c, ' + JSON.stringify(options) + ')')
+            .notThrow();
+        should(node.channelCount, 'node2.channelCount')
+            .beEqualTo(options.channelCount);
+
+        // Test that other channel counts throw an error
+        options = {channelCount: 0};
+        should(
+            () => {
+              node = new PannerNode(context, options);
+            },
+            'new PannerNode(c, ' + JSON.stringify(options) + ')')
+            .throw(DOMException, 'NotSupportedError');
+        should(
+            () => {
+              node = new PannerNode(context);
+              node.channelCount = options.channelCount;
+            },
+            `node.channelCount = ${options.channelCount}`)
+            .throw(DOMException, "NotSupportedError");
+        should(node.channelCount,
+               `node.channelCount after setting to ${options.channelCount}`)
+            .beEqualTo(2);
+
+        options = {channelCount: 3};
+        should(
+            () => {
+              node = new PannerNode(context, options);
+            },
+            'new PannerNode(c, ' + JSON.stringify(options) + ')')
+            .throw(DOMException, 'NotSupportedError');
+        should(
+            () => {
+              node = new PannerNode(context);
+              node.channelCount = options.channelCount;
+            },
+            `node.channelCount = ${options.channelCount}`)
+            .throw(DOMException, "NotSupportedError");
+        should(node.channelCount,
+               `node.channelCount after setting to ${options.channelCount}`)
+            .beEqualTo(2);
+
+        options = {channelCount: 99};
+        should(
+            () => {
+              node = new PannerNode(context, options);
+            },
+            'new PannerNode(c, ' + JSON.stringify(options) + ')')
+            .throw(DOMException, 'NotSupportedError');
+        should(
+            () => {
+              node = new PannerNode(context);
+              node.channelCount = options.channelCount;
+            },
+            `node.channelCount = ${options.channelCount}`)
+            .throw(DOMException, "NotSupportedError");
+        should(node.channelCount,
+               `node.channelCount after setting to ${options.channelCount}`)
+            .beEqualTo(2);
+
+        // Test channelCountMode.  A mode of "max" is illegal, but others are
+        // ok.
+        options = {channelCountMode: 'clamped-max'};
+        should(
+            () => {
+              node = new PannerNode(context, options);
+            },
+            'node3 = new PannerNode(c, ' + JSON.stringify(options) + ')')
+            .notThrow();
+        should(node.channelCountMode, 'node3.channelCountMode')
+            .beEqualTo(options.channelCountMode);
+
+        options = {channelCountMode: 'explicit'};
+        should(
+            () => {
+              node = new PannerNode(context, options);
+            },
+            'node4 = new PannerNode(c, ' + JSON.stringify(options) + ')')
+            .notThrow();
+        should(node.channelCountMode, 'node4.channelCountMode')
+            .beEqualTo(options.channelCountMode);
+
+        options = {channelCountMode: 'max'};
+        should(
+            () => {
+              node = new PannerNode(context, options);
+            },
+            'new PannerNode(c, ' + JSON.stringify(options) + ')')
+            .throw(DOMException, 'NotSupportedError');
+        should(
+            () => {
+              node = new PannerNode(context);
+              node.channelCountMode = options.channelCountMode;
+            },
+            `node.channelCountMode = ${options.channelCountMode}`)
+            .throw(DOMException, "NotSupportedError");
+        should(node.channelCountMode,
+               `node.channelCountMode after setting to ${options.channelCountMode}`)
+            .beEqualTo("clamped-max");
+
+        options = {channelCountMode: 'foobar'};
+        should(
+            () => {
+              node = new PannerNode(context, options);
+            },
+            'new PannerNode(c, " + JSON.stringify(options) + ")')
+            .throw(TypeError);
+        should(
+            () => {
+              node = new PannerNode(context);
+              node.channelCountMode = options.channelCountMode;
+            },
+            `node.channelCountMode = ${options.channelCountMode}`)
+            .notThrow(); // Invalid assignment to enum-valued attrs does not throw.
+        should(node.channelCountMode,
+               `node.channelCountMode after setting to ${options.channelCountMode}`)
+            .beEqualTo("clamped-max");
+
+        // Test channelInterpretation.
+        options = {channelInterpretation: 'speakers'};
+        should(
+            () => {
+              node = new PannerNode(context, options);
+            },
+            'node5 = new PannerNode(c, ' + JSON.stringify(options) + ')')
+            .notThrow();
+        should(node.channelInterpretation, 'node5.channelInterpretation')
+            .beEqualTo(options.channelInterpretation);
+
+        options = {channelInterpretation: 'discrete'};
+        should(
+            () => {
+              node = new PannerNode(context, options);
+            },
+            'node6 = new PannerNode(c, ' + JSON.stringify(options) + ')')
+            .notThrow();
+        should(node.channelInterpretation, 'node6.channelInterpretation')
+            .beEqualTo(options.channelInterpretation);
+
+        options = {channelInterpretation: 'foobar'};
+        should(
+            () => {
+              node = new PannerNode(context, options);
+            },
+            'new PannerNode(c, ' + JSON.stringify(options) + ')')
+            .throw(TypeError);
+
+        // Test maxDistance
+        options = {maxDistance: -1};
+        should(
+            () => {
+              node = new PannerNode(context, options);
+            },
+            'new PannerNode(c, ' + JSON.stringify(options) + ')')
+            .throw(RangeError);
+        should(
+            () => {
+              node = new PannerNode(context);
+              node.maxDistance = options.maxDistance;
+            },
+            `node.maxDistance = ${options.maxDistance}`)
+            .throw(RangeError);
+        should(node.maxDistance,
+               `node.maxDistance after setting to ${options.maxDistance}`)
+            .beEqualTo(10000);
+
+        options = {maxDistance: 100};
+        should(
+            () => {
+              node = new PannerNode(context, options);
+            },
+            'node7 = new PannerNode(c, ' + JSON.stringify(options) + ')')
+            .notThrow();
+        should(node.maxDistance, 'node7.maxDistance')
+            .beEqualTo(options.maxDistance);
+
+        // Test rolloffFactor
+        options = {rolloffFactor: -1};
+        should(
+            () => {
+              node = new PannerNode(context, options);
+            },
+            'new PannerNode(c, ' + JSON.stringify(options) + ')')
+            .throw(RangeError);
+        should(
+            () => {
+              node = new PannerNode(context);
+              node.rolloffFactor = options.rolloffFactor;
+            },
+            `node.rolloffFactor = ${options.rolloffFactor}`)
+            .throw(RangeError);
+        should(node.rolloffFactor,
+               `node.rolloffFactor after setting to ${options.rolloffFactor}`)
+            .beEqualTo(1);
+
+        options = {rolloffFactor: 0};
+        should(
+            () => {
+              node = new PannerNode(context, options);
+            },
+            'node8 = new PannerNode(c, ' + JSON.stringify(options) + ')')
+            .notThrow();
+        should(node.rolloffFactor, 'node8.rolloffFactor')
+            .beEqualTo(options.rolloffFactor);
+
+        options = {rolloffFactor: 0.5};
+        should(
+            () => {
+              node = new PannerNode(context, options);
+            },
+            'node8 = new PannerNode(c, ' + JSON.stringify(options) + ')')
+            .notThrow();
+        should(node.rolloffFactor, 'node8.rolloffFactor')
+            .beEqualTo(options.rolloffFactor);
+
+        options = {rolloffFactor: 100};
+        should(
+            () => {
+              node = new PannerNode(context, options);
+            },
+            'node8 = new PannerNode(c, ' + JSON.stringify(options) + ')')
+            .notThrow();
+        should(node.rolloffFactor, 'node8.rolloffFactor')
+            .beEqualTo(options.rolloffFactor);
+
+        // Test coneOuterGain
+        options = {coneOuterGain: -1};
+        should(
+            () => {
+              node = new PannerNode(context, options);
+            },
+            'new PannerNode(c, ' + JSON.stringify(options) + ')')
+            .throw(DOMException, 'InvalidStateError');
+        should(
+            () => {
+              node = new PannerNode(context);
+              node.coneOuterGain = options.coneOuterGain;
+            },
+            `node.coneOuterGain = ${options.coneOuterGain}`)
+            .throw(DOMException, 'InvalidStateError');
+        should(node.coneOuterGain,
+               `node.coneOuterGain after setting to ${options.coneOuterGain}`)
+            .beEqualTo(0);
+
+        options = {coneOuterGain: 1.1};
+        should(
+            () => {
+              node = new PannerNode(context, options);
+            },
+            'new PannerNode(c, ' + JSON.stringify(options) + ')')
+            .throw(DOMException, 'InvalidStateError');
+        should(
+            () => {
+              node = new PannerNode(context);
+              node.coneOuterGain = options.coneOuterGain;
+            },
+            `node.coneOuterGain = ${options.coneOuterGain}`)
+            .throw(DOMException, 'InvalidStateError');
+        should(node.coneOuterGain,
+               `node.coneOuterGain after setting to ${options.coneOuterGain}`)
+            .beEqualTo(0);
+
+        options = {coneOuterGain: 0.0};
+        should(
+            () => {
+              node = new PannerNode(context, options);
+            },
+            'node9 = new PannerNode(c, ' + JSON.stringify(options) + ')')
+            .notThrow();
+        should(node.coneOuterGain, 'node9.coneOuterGain')
+            .beEqualTo(options.coneOuterGain);
+        options = {coneOuterGain: 0.5};
+        should(
+            () => {
+              node = new PannerNode(context, options);
+            },
+            'node9 = new PannerNode(c, ' + JSON.stringify(options) + ')')
+            .notThrow();
+        should(node.coneOuterGain, 'node9.coneOuterGain')
+            .beEqualTo(options.coneOuterGain);
+
+        options = {coneOuterGain: 1.0};
+        should(
+            () => {
+              node = new PannerNode(context, options);
+            },
+            'node9 = new PannerNode(c, ' + JSON.stringify(options) + ')')
+            .notThrow();
+        should(node.coneOuterGain, 'node9.coneOuterGain')
+            .beEqualTo(options.coneOuterGain);
+
+        task.done();
+      });
+
+      audit.define('constructor with options', (task, should) => {
+        let node;
+        let success = true;
+        let options = {
+          panningModel: 'HRTF',
+          // We use full double float values here to verify also that the actual
+          // AudioParam value is properly rounded to a float.  The actual value
+          // is immaterial as long as x != Math.fround(x).
+          positionX: Math.SQRT2,
+          positionY: 2 * Math.SQRT2,
+          positionZ: 3 * Math.SQRT2,
+          orientationX: -Math.SQRT2,
+          orientationY: -2 * Math.SQRT2,
+          orientationZ: -3 * Math.SQRT2,
+          distanceModel: 'linear',
+          // We use full double float values here to verify also that the actual
+          // attribute is a double float.  The actual value is immaterial as
+          // long as x != Math.fround(x).
+          refDistance: Math.PI,
+          maxDistance: 2 * Math.PI,
+          rolloffFactor: 3 * Math.PI,
+          coneInnerAngle: 4 * Math.PI,
+          coneOuterAngle: 5 * Math.PI,
+          coneOuterGain: 0.1 * Math.PI
+        };
+
+        should(
+            () => {
+              node = new PannerNode(context, options);
+            },
+            'node = new PannerNode(c, ' + JSON.stringify(options) + ')')
+            .notThrow();
+        should(node instanceof PannerNode, 'node instanceof PannerNode')
+            .beEqualTo(true);
+
+        should(node.panningModel, 'node.panningModel')
+            .beEqualTo(options.panningModel);
+        should(node.positionX.value, 'node.positionX.value')
+            .beEqualTo(Math.fround(options.positionX));
+        should(node.positionY.value, 'node.positionY.value')
+            .beEqualTo(Math.fround(options.positionY));
+        should(node.positionZ.value, 'node.positionZ.value')
+            .beEqualTo(Math.fround(options.positionZ));
+        should(node.orientationX.value, 'node.orientationX.value')
+            .beEqualTo(Math.fround(options.orientationX));
+        should(node.orientationY.value, 'node.orientationY.value')
+            .beEqualTo(Math.fround(options.orientationY));
+        should(node.orientationZ.value, 'node.orientationZ.value')
+            .beEqualTo(Math.fround(options.orientationZ));
+        should(node.distanceModel, 'node.distanceModel')
+            .beEqualTo(options.distanceModel);
+        should(node.refDistance, 'node.refDistance')
+            .beEqualTo(options.refDistance);
+        should(node.maxDistance, 'node.maxDistance')
+            .beEqualTo(options.maxDistance);
+        should(node.rolloffFactor, 'node.rolloffFactor')
+            .beEqualTo(options.rolloffFactor);
+        should(node.coneInnerAngle, 'node.coneInnerAngle')
+            .beEqualTo(options.coneInnerAngle);
+        should(node.coneOuterAngle, 'node.coneOuterAngle')
+            .beEqualTo(options.coneOuterAngle);
+        should(node.coneOuterGain, 'node.coneOuterGain')
+            .beEqualTo(options.coneOuterGain);
+
+        should(node.channelCount, 'node.channelCount').beEqualTo(2);
+        should(node.channelCountMode, 'node.channelCountMode')
+            .beEqualTo('clamped-max');
+        should(node.channelInterpretation, 'node.channelInterpretation')
+            .beEqualTo('speakers');
+
+        task.done();
+      });
+
+      audit.run();
+    </script>
+  </body>
+</html>