tenfourfox/devtools/server/actors/webaudio.js
Cameron Kaiser c9b2922b70 hello FPR
2017-04-19 00:56:45 -07:00

1022 lines
30 KiB
JavaScript

/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
const {Cc, Ci, Cu, Cr} = require("chrome");
const Services = require("Services");
const events = require("sdk/event/core");
const promise = require("promise");
const { on: systemOn, off: systemOff } = require("sdk/system/events");
const protocol = require("devtools/server/protocol");
const { CallWatcherActor, CallWatcherFront } = require("devtools/server/actors/call-watcher");
const { createValueGrip } = require("devtools/server/actors/object");
const AutomationTimeline = require("./utils/automation-timeline");
const { on, once, off, emit } = events;
const { types, method, Arg, Option, RetVal, preEvent } = protocol;
const AUDIO_NODE_DEFINITION = require("devtools/server/actors/utils/audionodes.json");
const ENABLE_AUTOMATION = false;
const AUTOMATION_GRANULARITY = 2000;
const AUTOMATION_GRANULARITY_MAX = 6000;
const AUDIO_GLOBALS = [
"AudioContext", "AudioNode", "AudioParam"
];
const NODE_CREATION_METHODS = [
"createBufferSource", "createMediaElementSource", "createMediaStreamSource",
"createMediaStreamDestination", "createScriptProcessor", "createAnalyser",
"createGain", "createDelay", "createBiquadFilter", "createWaveShaper",
"createPanner", "createConvolver", "createChannelSplitter", "createChannelMerger",
"createDynamicsCompressor", "createOscillator", "createStereoPanner"
];
const AUTOMATION_METHODS = [
"setValueAtTime", "linearRampToValueAtTime", "exponentialRampToValueAtTime",
"setTargetAtTime", "setValueCurveAtTime", "cancelScheduledValues"
];
const NODE_ROUTING_METHODS = [
"connect", "disconnect"
];
/**
* An Audio Node actor allowing communication to a specific audio node in the
* Audio Context graph.
*/
types.addActorType("audionode");
var AudioNodeActor = exports.AudioNodeActor = protocol.ActorClass({
typeName: "audionode",
form: function (detail) {
if (detail === "actorid") {
return this.actorID;
}
return {
actor: this.actorID, // actorID is set when this is added to a pool
type: this.type,
source: this.source,
bypassable: this.bypassable,
};
},
/**
* Create the Audio Node actor.
*
* @param DebuggerServerConnection conn
* The server connection.
* @param AudioNode node
* The AudioNode that was created.
*/
initialize: function (conn, node) {
protocol.Actor.prototype.initialize.call(this, conn);
// Store ChromeOnly property `id` to identify AudioNode,
// rather than storing a strong reference, and store a weak
// ref to underlying node for controlling.
this.nativeID = node.id;
this.node = Cu.getWeakReference(node);
// Stores the AutomationTimelines for this node's AudioParams.
this.automation = {};
try {
this.type = getConstructorName(node);
} catch (e) {
this.type = "";
}
this.source = !!AUDIO_NODE_DEFINITION[this.type].source;
this.bypassable = !AUDIO_NODE_DEFINITION[this.type].unbypassable;
// Create automation timelines for all AudioParams
Object.keys(AUDIO_NODE_DEFINITION[this.type].properties || {})
.filter(isAudioParam.bind(null, node))
.forEach(paramName => {
this.automation[paramName] = new AutomationTimeline(node[paramName].defaultValue);
});
},
/**
* Returns the string name of the audio type.
*
* DEPRECATED: Use `audionode.type` instead, left here for legacy reasons.
*/
getType: method(function () {
return this.type;
}, { response: { type: RetVal("string") }}),
/**
* Returns a boolean indicating if the AudioNode has been "bypassed",
* via `AudioNodeActor#bypass` method.
*
* @return Boolean
*/
isBypassed: method(function () {
let node = this.node.get();
if (node === null) {
return false;
}
// Cast to boolean incase `passThrough` is undefined,
// like for AudioDestinationNode
return !!node.passThrough;
}, {
response: { bypassed: RetVal("boolean") }
}),
/**
* Takes a boolean, either enabling or disabling the "passThrough" option
* on an AudioNode. If a node is bypassed, an effects processing node (like gain, biquad),
* will allow the audio stream to pass through the node, unaffected. Returns
* the bypass state of the node.
*
* @param Boolean enable
* Whether the bypass value should be set on or off.
* @return Boolean
*/
bypass: method(function (enable) {
let node = this.node.get();
if (node === null) {
return;
}
if (this.bypassable) {
node.passThrough = enable;
}
return this.isBypassed();
}, {
request: { enable: Arg(0, "boolean") },
response: { bypassed: RetVal("boolean") }
}),
/**
* Changes a param on the audio node. Responds with either `undefined`
* on success, or a description of the error upon param set failure.
*
* @param String param
* Name of the AudioParam to change.
* @param String value
* Value to change AudioParam to.
*/
setParam: method(function (param, value) {
let node = this.node.get();
if (node === null) {
return CollectedAudioNodeError();
}
try {
if (isAudioParam(node, param)) {
node[param].value = value;
this.automation[param].setValue(value);
}
else {
node[param] = value;
}
return undefined;
} catch (e) {
return constructError(e);
}
}, {
request: {
param: Arg(0, "string"),
value: Arg(1, "nullable:primitive")
},
response: { error: RetVal("nullable:json") }
}),
/**
* Gets a param on the audio node.
*
* @param String param
* Name of the AudioParam to fetch.
*/
getParam: method(function (param) {
let node = this.node.get();
if (node === null) {
return CollectedAudioNodeError();
}
// Check to see if it's an AudioParam -- if so,
// return the `value` property of the parameter.
let value = isAudioParam(node, param) ? node[param].value : node[param];
// Return the grip form of the value; at this time,
// there shouldn't be any non-primitives at the moment, other than
// AudioBuffer or Float32Array references and the like,
// so this just formats the value to be displayed in the VariablesView,
// without using real grips and managing via actor pools.
let grip = createValueGrip(value, null, createObjectGrip);
return grip;
}, {
request: {
param: Arg(0, "string")
},
response: { text: RetVal("nullable:primitive") }
}),
/**
* Get an object containing key-value pairs of additional attributes
* to be consumed by a front end, like if a property should be read only,
* or is a special type (Float32Array, Buffer, etc.)
*
* @param String param
* Name of the AudioParam whose flags are desired.
*/
getParamFlags: method(function (param) {
return ((AUDIO_NODE_DEFINITION[this.type] || {}).properties || {})[param];
}, {
request: { param: Arg(0, "string") },
response: { flags: RetVal("nullable:primitive") }
}),
/**
* Get an array of objects each containing a `param` and `value` property,
* corresponding to a property name and current value of the audio node.
*/
getParams: method(function (param) {
let props = Object.keys(AUDIO_NODE_DEFINITION[this.type].properties || {});
return props.map(prop =>
({ param: prop, value: this.getParam(prop), flags: this.getParamFlags(prop) }));
}, {
response: { params: RetVal("json") }
}),
/**
* Connects this audionode to an AudioParam via `node.connect(param)`.
*/
connectParam: method(function (destActor, paramName, output) {
let srcNode = this.node.get();
let destNode = destActor.node.get();
if (srcNode === null || destNode === null) {
return CollectedAudioNodeError();
}
try {
// Connect via the unwrapped node, so we can call the
// patched method that fires the webaudio actor's `connect-param` event.
// Connect directly to the wrapped `destNode`, otherwise
// the patched method thinks this is a new node and won't be
// able to find it in `_nativeToActorID`.
XPCNativeWrapper.unwrap(srcNode).connect(destNode[paramName], output);
} catch (e) {
return constructError(e);
}
}, {
request: {
destActor: Arg(0, "audionode"),
paramName: Arg(1, "string"),
output: Arg(2, "nullable:number")
},
response: { error: RetVal("nullable:json") }
}),
/**
* Connects this audionode to another via `node.connect(dest)`.
*/
connectNode: method(function (destActor, output, input) {
let srcNode = this.node.get();
let destNode = destActor.node.get();
if (srcNode === null || destNode === null) {
return CollectedAudioNodeError();
}
try {
// Connect via the unwrapped node, so we can call the
// patched method that fires the webaudio actor's `connect-node` event.
// Connect directly to the wrapped `destNode`, otherwise
// the patched method thinks this is a new node and won't be
// able to find it in `_nativeToActorID`.
XPCNativeWrapper.unwrap(srcNode).connect(destNode, output, input);
} catch (e) {
return constructError(e);
}
}, {
request: {
destActor: Arg(0, "audionode"),
output: Arg(1, "nullable:number"),
input: Arg(2, "nullable:number")
},
response: { error: RetVal("nullable:json") }
}),
/**
* Disconnects this audionode from all connections via `node.disconnect()`.
*/
disconnect: method(function (destActor, output) {
let node = this.node.get();
if (node === null) {
return CollectedAudioNodeError();
}
try {
// Disconnect via the unwrapped node, so we can call the
// patched method that fires the webaudio actor's `disconnect` event.
XPCNativeWrapper.unwrap(node).disconnect(output);
} catch (e) {
return constructError(e);
}
}, {
request: { output: Arg(0, "nullable:number") },
response: { error: RetVal("nullable:json") }
}),
getAutomationData: method(function (paramName) {
let timeline = this.automation[paramName];
if (!timeline) {
return null;
}
let events = timeline.events;
let values = [];
let i = 0;
if (!timeline.events.length) {
return { events, values };
}
let firstEvent = events[0];
let lastEvent = events[timeline.events.length - 1];
// `setValueCurveAtTime` will have a duration value -- other
// events will have duration of `0`.
let timeDelta = (lastEvent.time + lastEvent.duration) - firstEvent.time;
let scale = timeDelta / AUTOMATION_GRANULARITY;
for (; i < AUTOMATION_GRANULARITY; i++) {
let delta = firstEvent.time + (i * scale);
let value = timeline.getValueAtTime(delta);
values.push({ delta, value });
}
// If the last event is setTargetAtTime, the automation
// doesn't actually begin until the event's time, and exponentially
// approaches the target value. In this case, we add more values
// until we're "close enough" to the target.
if (lastEvent.type === "setTargetAtTime") {
for (; i < AUTOMATION_GRANULARITY_MAX; i++) {
let delta = firstEvent.time + (++i * scale);
let value = timeline.getValueAtTime(delta);
values.push({ delta, value });
}
}
return { events, values };
}, {
request: { paramName: Arg(0, "string") },
response: { values: RetVal("nullable:json") }
}),
/**
* Called via WebAudioActor, registers an automation event
* for the AudioParam called.
*
* @param String paramName
* Name of the AudioParam.
* @param String eventName
* Name of the automation event called.
* @param Array args
* Arguments passed into the automation call.
*/
addAutomationEvent: method(function (paramName, eventName, args=[]) {
let node = this.node.get();
let timeline = this.automation[paramName];
if (node === null) {
return CollectedAudioNodeError();
}
if (!timeline || !node[paramName][eventName]) {
return InvalidCommandError();
}
try {
// Using the unwrapped node and parameter, the corresponding
// WebAudioActor event will be fired, subsequently calling
// `_recordAutomationEvent`. Some finesse is required to handle
// the cast of TypedArray arguments over the protocol, which is
// taken care of below. The event will cast the argument back
// into an array to be broadcasted from WebAudioActor, but the
// double-casting will only occur when starting from `addAutomationEvent`,
// which is only used in tests.
let param = XPCNativeWrapper.unwrap(node[paramName]);
let contentGlobal = Cu.getGlobalForObject(param);
let contentArgs = Cu.cloneInto(args, contentGlobal);
// If calling `setValueCurveAtTime`, the first argument
// is a Float32Array, which won't be able to be serialized
// over the protocol. Cast a normal array to a Float32Array here.
if (eventName === "setValueCurveAtTime") {
// Create a Float32Array from the content, seeding with an array
// from the same scope.
let curve = new contentGlobal.Float32Array(contentArgs[0]);
contentArgs[0] = curve;
}
// Apply the args back from the content scope, which is necessary
// due to the method wrapping changing in bug 1130901 to be exported
// directly to the content scope.
param[eventName].apply(param, contentArgs);
} catch (e) {
return constructError(e);
}
}, {
request: {
paramName: Arg(0, "string"),
eventName: Arg(1, "string"),
args: Arg(2, "nullable:json")
},
response: { error: RetVal("nullable:json") }
}),
/**
* Registers the automation event in the AudioNodeActor's
* internal timeline. Called when setting automation via
* `addAutomationEvent`, or from the WebAudioActor's listening
* to the event firing via content.
*
* @param String paramName
* Name of the AudioParam.
* @param String eventName
* Name of the automation event called.
* @param Array args
* Arguments passed into the automation call.
*/
_recordAutomationEvent: function (paramName, eventName, args) {
let timeline = this.automation[paramName];
timeline[eventName].apply(timeline, args);
}
});
/**
* The corresponding Front object for the AudioNodeActor.
*
* @attribute {String} type
* The type of audio node, like "OscillatorNode", "MediaElementAudioSourceNode"
* @attribute {Boolean} source
* Boolean indicating if the node is a source node, like BufferSourceNode,
* MediaElementAudioSourceNode, OscillatorNode, etc.
* @attribute {Boolean} bypassable
* Boolean indicating if the audio node is bypassable (splitter,
* merger and destination nodes, for example, are not)
*/
var AudioNodeFront = protocol.FrontClass(AudioNodeActor, {
form: function (form, detail) {
if (detail === "actorid") {
this.actorID = form;
return;
}
this.actorID = form.actor;
this.type = form.type;
this.source = form.source;
this.bypassable = form.bypassable;
},
initialize: function (client, form) {
protocol.Front.prototype.initialize.call(this, client, form);
// if we were manually passed a form, this was created manually and
// needs to own itself for now.
if (form) {
this.manage(this);
}
}
});
/**
* The Web Audio Actor handles simple interaction with an AudioContext
* high-level methods. After instantiating this actor, you'll need to set it
* up by calling setup().
*/
var WebAudioActor = exports.WebAudioActor = protocol.ActorClass({
typeName: "webaudio",
initialize: function(conn, tabActor) {
protocol.Actor.prototype.initialize.call(this, conn);
this.tabActor = tabActor;
this._onContentFunctionCall = this._onContentFunctionCall.bind(this);
// Store ChromeOnly ID (`nativeID` property on AudioNodeActor) mapped
// to the associated actorID, so we don't have to expose `nativeID`
// to the client in any way.
this._nativeToActorID = new Map();
this._onDestroyNode = this._onDestroyNode.bind(this);
this._onGlobalDestroyed = this._onGlobalDestroyed.bind(this);
this._onGlobalCreated = this._onGlobalCreated.bind(this);
},
destroy: function(conn) {
protocol.Actor.prototype.destroy.call(this, conn);
this.finalize();
},
/**
* Returns definition of all AudioNodes, such as AudioParams, and
* flags.
*/
getDefinition: method(function () {
return AUDIO_NODE_DEFINITION;
}, {
response: { definition: RetVal("json") }
}),
/**
* Starts waiting for the current tab actor's document global to be
* created, in order to instrument the Canvas context and become
* aware of everything the content does with Web Audio.
*
* See ContentObserver and WebAudioInstrumenter for more details.
*/
setup: method(function({ reload }) {
// Used to track when something is happening with the web audio API
// the first time, to ultimately fire `start-context` event
this._firstNodeCreated = false;
// Clear out stored nativeIDs on reload as we do not want to track
// AudioNodes that are no longer on this document.
this._nativeToActorID.clear();
if (this._initialized) {
return;
}
this._initialized = true;
this._callWatcher = new CallWatcherActor(this.conn, this.tabActor);
this._callWatcher.onCall = this._onContentFunctionCall;
this._callWatcher.setup({
tracedGlobals: AUDIO_GLOBALS,
startRecording: true,
performReload: reload,
holdWeak: true,
storeCalls: false
});
// Bind to `window-ready` so we can reenable recording on the
// call watcher
on(this.tabActor, "window-ready", this._onGlobalCreated);
// Bind to the `window-destroyed` event so we can unbind events between
// the global destruction and the `finalize` cleanup method on the actor.
on(this.tabActor, "window-destroyed", this._onGlobalDestroyed);
}, {
request: { reload: Option(0, "boolean") },
oneway: true
}),
/**
* Invoked whenever an instrumented function is called, like an AudioContext
* method or an AudioNode method.
*/
_onContentFunctionCall: function(functionCall) {
let { name } = functionCall.details;
// All Web Audio nodes inherit from AudioNode's prototype, so
// hook into the `connect` and `disconnect` methods
if (WebAudioFront.NODE_ROUTING_METHODS.has(name)) {
this._handleRoutingCall(functionCall);
}
else if (WebAudioFront.NODE_CREATION_METHODS.has(name)) {
this._handleCreationCall(functionCall);
}
else if (ENABLE_AUTOMATION && WebAudioFront.AUTOMATION_METHODS.has(name)) {
this._handleAutomationCall(functionCall);
}
},
_handleRoutingCall: function(functionCall) {
let { caller, args, name } = functionCall.details;
let source = caller;
let dest = args[0];
let isAudioParam = dest ? getConstructorName(dest) === "AudioParam" : false;
// audionode.connect(param)
if (name === "connect" && isAudioParam) {
this._onConnectParam(source, dest);
}
// audionode.connect(node)
else if (name === "connect") {
this._onConnectNode(source, dest);
}
// audionode.disconnect()
else if (name === "disconnect") {
this._onDisconnectNode(source);
}
},
_handleCreationCall: function (functionCall) {
let { caller, result } = functionCall.details;
// Keep track of the first node created, so we can alert
// the front end that an audio context is being used since
// we're not hooking into the constructor itself, just its
// instance's methods.
if (!this._firstNodeCreated) {
// Fire the start-up event if this is the first node created
// and trigger a `create-node` event for the context destination
this._onStartContext();
this._onCreateNode(caller.destination);
this._firstNodeCreated = true;
}
this._onCreateNode(result);
},
_handleAutomationCall: function (functionCall) {
let { caller, name, args } = functionCall.details;
let wrappedParam = new XPCNativeWrapper(caller);
// Sanitize arguments, as these should all be numbers,
// with the exception of a TypedArray, which needs
// casted to an Array
args = sanitizeAutomationArgs(args);
let nodeActor = this._getActorByNativeID(wrappedParam._parentID);
nodeActor._recordAutomationEvent(wrappedParam._paramName, name, args);
this._onAutomationEvent({
node: nodeActor,
paramName: wrappedParam._paramName,
eventName: name,
args: args
});
},
/**
* Stops listening for document global changes and puts this actor
* to hibernation. This method is called automatically just before the
* actor is destroyed.
*/
finalize: method(function() {
if (!this._initialized) {
return;
}
this._initialized = false;
systemOff("webaudio-node-demise", this._onDestroyNode);
off(this.tabActor, "window-destroyed", this._onGlobalDestroyed);
off(this.tabActor, "window-ready", this._onGlobalCreated);
this.tabActor = null;
this._nativeToActorID = null;
this._callWatcher.eraseRecording();
this._callWatcher.finalize();
this._callWatcher = null;
}, {
oneway: true
}),
/**
* Events emitted by this actor.
*/
events: {
"start-context": {
type: "startContext"
},
"connect-node": {
type: "connectNode",
source: Option(0, "audionode"),
dest: Option(0, "audionode")
},
"disconnect-node": {
type: "disconnectNode",
source: Arg(0, "audionode")
},
"connect-param": {
type: "connectParam",
source: Option(0, "audionode"),
dest: Option(0, "audionode"),
param: Option(0, "string")
},
"change-param": {
type: "changeParam",
source: Option(0, "audionode"),
param: Option(0, "string"),
value: Option(0, "string")
},
"create-node": {
type: "createNode",
source: Arg(0, "audionode")
},
"destroy-node": {
type: "destroyNode",
source: Arg(0, "audionode")
},
"automation-event": {
type: "automationEvent",
node: Option(0, "audionode"),
paramName: Option(0, "string"),
eventName: Option(0, "string"),
args: Option(0, "json")
}
},
/**
* Helper for constructing an AudioNodeActor, assigning to
* internal weak map, and tracking via `manage` so it is assigned
* an `actorID`.
*/
_constructAudioNode: function (node) {
// Ensure AudioNode is wrapped.
node = new XPCNativeWrapper(node);
this._instrumentParams(node);
let actor = new AudioNodeActor(this.conn, node);
this.manage(actor);
this._nativeToActorID.set(node.id, actor.actorID);
return actor;
},
/**
* Takes an XrayWrapper node, and attaches the node's `nativeID`
* to the AudioParams as `_parentID`, as well as the the type of param
* as a string on `_paramName`.
*/
_instrumentParams: function (node) {
let type = getConstructorName(node);
Object.keys(AUDIO_NODE_DEFINITION[type].properties || {})
.filter(isAudioParam.bind(null, node))
.forEach(paramName => {
let param = node[paramName];
param._parentID = node.id;
param._paramName = paramName;
});
},
/**
* Takes an AudioNode and returns the stored actor for it.
* In some cases, we won't have an actor stored (for example,
* connecting to an AudioDestinationNode, since it's implicitly
* created), so make a new actor and store that.
*/
_getActorByNativeID: function (nativeID) {
// Ensure we have a Number, rather than a string
// return via notification.
nativeID = ~~nativeID;
let actorID = this._nativeToActorID.get(nativeID);
let actor = actorID != null ? this.conn.getActor(actorID) : null;
return actor;
},
/**
* Called on first audio node creation, signifying audio context usage
*/
_onStartContext: function () {
systemOn("webaudio-node-demise", this._onDestroyNode);
emit(this, "start-context");
},
/**
* Called when one audio node is connected to another.
*/
_onConnectNode: function (source, dest) {
let sourceActor = this._getActorByNativeID(source.id);
let destActor = this._getActorByNativeID(dest.id);
emit(this, "connect-node", {
source: sourceActor,
dest: destActor
});
},
/**
* Called when an audio node is connected to an audio param.
*/
_onConnectParam: function (source, param) {
let sourceActor = this._getActorByNativeID(source.id);
let destActor = this._getActorByNativeID(param._parentID);
emit(this, "connect-param", {
source: sourceActor,
dest: destActor,
param: param._paramName
});
},
/**
* Called when an audio node is disconnected.
*/
_onDisconnectNode: function (node) {
let actor = this._getActorByNativeID(node.id);
emit(this, "disconnect-node", actor);
},
/**
* Called when a parameter changes on an audio node
*/
_onParamChange: function (node, param, value) {
let actor = this._getActorByNativeID(node.id);
emit(this, "param-change", {
source: actor,
param: param,
value: value
});
},
/**
* Called on node creation.
*/
_onCreateNode: function (node) {
let actor = this._constructAudioNode(node);
emit(this, "create-node", actor);
},
/** Called when `webaudio-node-demise` is triggered,
* and emits the associated actor to the front if found.
*/
_onDestroyNode: function ({data}) {
// Cast to integer.
let nativeID = ~~data;
let actor = this._getActorByNativeID(nativeID);
// If actorID exists, emit; in the case where we get demise
// notifications for a document that no longer exists,
// the mapping should not be found, so we do not emit an event.
if (actor) {
this._nativeToActorID.delete(nativeID);
emit(this, "destroy-node", actor);
}
},
/**
* Ensures that the new global has recording on
* so we can proxy the function calls.
*/
_onGlobalCreated: function () {
this._callWatcher.resumeRecording();
},
/**
* Fired when an automation event is added to an AudioNode.
*/
_onAutomationEvent: function ({node, paramName, eventName, args}) {
emit(this, "automation-event", {
node: node,
paramName: paramName,
eventName: eventName,
args: args
});
},
/**
* Called when the underlying ContentObserver fires `global-destroyed`
* so we can cleanup some things between the global being destroyed and
* when the actor's `finalize` method gets called.
*/
_onGlobalDestroyed: function ({id}) {
if (this._callWatcher._tracedWindowId !== id) {
return;
}
if (this._nativeToActorID) {
this._nativeToActorID.clear();
}
systemOff("webaudio-node-demise", this._onDestroyNode);
}
});
/**
* The corresponding Front object for the WebAudioActor.
*/
var WebAudioFront = exports.WebAudioFront = protocol.FrontClass(WebAudioActor, {
initialize: function(client, { webaudioActor }) {
protocol.Front.prototype.initialize.call(this, client, { actor: webaudioActor });
this.manage(this);
},
/**
* If connecting to older geckos (<Fx43), where audio node actor's do not
* contain `type`, `source` and `bypassable` properties, fetch
* them manually here.
*/
_onCreateNode: preEvent("create-node", function (audionode) {
if (!audionode.type) {
return audionode.getType().then(type => {
audionode.type = type;
audionode.source = !!AUDIO_NODE_DEFINITION[type].source;
audionode.bypassable = !AUDIO_NODE_DEFINITION[type].unbypassable;
});
}
}),
});
WebAudioFront.AUTOMATION_METHODS = new Set(AUTOMATION_METHODS);
WebAudioFront.NODE_CREATION_METHODS = new Set(NODE_CREATION_METHODS);
WebAudioFront.NODE_ROUTING_METHODS = new Set(NODE_ROUTING_METHODS);
/**
* Determines whether or not property is an AudioParam.
*
* @param AudioNode node
* An AudioNode.
* @param String prop
* Property of `node` to evaluate to see if it's an AudioParam.
* @return Boolean
*/
function isAudioParam (node, prop) {
return !!(node[prop] && /AudioParam/.test(node[prop].toString()));
}
/**
* Takes an `Error` object and constructs a JSON-able response
*
* @param Error err
* A TypeError, RangeError, etc.
* @return Object
*/
function constructError (err) {
return {
message: err.message,
type: err.constructor.name
};
}
/**
* Creates and returns a JSON-able response used to indicate
* attempt to access an AudioNode that has been GC'd.
*
* @return Object
*/
function CollectedAudioNodeError () {
return {
message: "AudioNode has been garbage collected and can no longer be reached.",
type: "UnreachableAudioNode"
};
}
function InvalidCommandError () {
return {
message: "The command on AudioNode is invalid.",
type: "InvalidCommand"
};
}
/**
* Takes an object and converts it's `toString()` form, like
* "[object OscillatorNode]" or "[object Float32Array]",
* or XrayWrapper objects like "[object XrayWrapper [object Array]]"
* to a string of just the constructor name, like "OscillatorNode",
* or "Float32Array".
*/
function getConstructorName (obj) {
return obj.toString().match(/\[object ([^\[\]]*)\]\]?$/)[1];
}
/**
* Create a grip-like object to pass in renderable information
* to the front-end for things like Float32Arrays, AudioBuffers,
* without tracking them in an actor pool.
*/
function createObjectGrip (value) {
return {
type: "object",
preview: {
kind: "ObjectWithText",
text: ""
},
class: getConstructorName(value)
};
}
/**
* Converts all TypedArrays of the array that cannot
* be passed over the wire into a normal Array equivilent.
*/
function sanitizeAutomationArgs (args) {
return args.reduce((newArgs, el) => {
newArgs.push(typeof el === "object" && getConstructorName(el) === "Float32Array" ? castToArray(el) : el);
return newArgs;
}, []);
}
/**
* Casts TypedArray to a normal array via a
* new scope.
*/
function castToArray (typedArray) {
// The Xray machinery for TypedArrays denies indexed access on the grounds
// that it's slow, and advises callers to do a structured clone instead.
let global = Cu.getGlobalForObject(this);
let safeView = Cu.cloneInto(typedArray.subarray(), global);
return copyInto([], safeView);
}
/**
* Copies values of an array-like `source` into
* a similarly array-like `dest`.
*/
function copyInto (dest, source) {
for (let i = 0; i < source.length; i++) {
dest[i] = source[i];
}
return dest;
}