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658 lines
20 KiB
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658 lines
20 KiB
HTML
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<title>JSDoc: Source: visual/Camera.js</title>
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<h1 class="page-title">Source: visual/Camera.js</h1>
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<section>
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<article>
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<pre class="prettyprint source linenums"><code>/**
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* Manager handling the recording of video signal.
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*
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* @author Alain Pitiot
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* @version 2021.2.0
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* @copyright (c) 2021 Open Science Tools Ltd. (https://opensciencetools.org)
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* @license Distributed under the terms of the MIT License
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*/
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import {Clock} from "../util/Clock.js";
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import {PsychObject} from "../util/PsychObject.js";
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import {PsychoJS} from "../core/PsychoJS.js";
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import * as util from "../util/Util.js";
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import {ExperimentHandler} from "../data/ExperimentHandler.js";
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// import {VideoClip} from "./VideoClip";
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/**
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* <p>This manager handles the recording of video signal.</p>
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*
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* @name module:visual.Camera
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* @class
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* @param {Object} options
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* @param {module:core.Window} options.win - the associated Window
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* @param {string} [options.format='video/webm;codecs=vp9'] the video format
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* @param {boolean} [options.showDialog=false] - whether or not to open a dialog box to inform the
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* participant to wait for the camera to be initialised
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* @param {string} [options.dialogMsg="Please wait a few moments while the camera initialises"] -
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* default message informing the participant to wait for the camera to initialise
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* @param {Clock} [options.clock= undefined] - an optional clock
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* @param {boolean} [options.autoLog= false] - whether or not to log
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*
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* @todo add video constraints as parameter
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*/
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export class Camera extends PsychObject
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{
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constructor({win, name, format, showDialog, dialogMsg = "Please wait a few moments while the camera initialises", clock, autoLog} = {})
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{
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super(win._psychoJS);
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this._addAttribute("win", win, undefined);
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this._addAttribute("name", name, "camera");
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this._addAttribute("format", format, "video/webm;codecs=vp9", this._onChange);
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this._addAttribute("clock", clock, new Clock());
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this._addAttribute("autoLog", autoLog, false);
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this._addAttribute("status", PsychoJS.Status.NOT_STARTED);
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// open pop-up dialog:
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if (showDialog)
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{
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this.psychoJS.gui.dialog({
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warning: dialogMsg,
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showOK: false,
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});
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}
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// prepare the recording:
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this._prepareRecording().then( () =>
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{
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if (showDialog)
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{
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this.psychoJS.gui.closeDialog();
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}
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})
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if (this._autoLog)
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{
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this._psychoJS.experimentLogger.exp(`Created ${this.name} = ${this.toString()}`);
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}
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}
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/**
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* Query whether or not the camera is ready to record.
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*
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* @name module:visual.Camera#isReady
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* @function
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* @public
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* @returns {boolean} whether or not the camera is ready to record
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*/
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isReady()
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{
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return (this._recorder !== null);
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}
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/**
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* Get the underlying video stream.
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*
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* @name module:visual.Camera#getStream
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* @function
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* @public
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* @returns {MediaStream} the video stream
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*/
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getStream()
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{
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return this._stream;
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}
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/**
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* Get a video element pointing to the Camera stream.
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*
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* @name module:visual.Camera#getVideo
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* @function
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* @public
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* @returns {HTMLVideoElement} a video element
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*/
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getVideo()
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{
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// note: we need to return a new video each time, since the camera feed can be used by
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// several stimuli and one of them might pause the feed
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// create a video with the appropriate size:
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const video = document.createElement("video");
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this._videos.push(video);
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video.width = this._streamSettings.width;
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video.height = this._streamSettings.height;
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video.autoplay = true;
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// prevent clicking:
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video.onclick = (mouseEvent) =>
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{
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mouseEvent.preventDefault();
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return false;
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};
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// use the camera stream as source for the video:
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video.srcObject = this._stream;
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return video;
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}
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/**
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* Submit a request to start the recording.
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*
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* @name module:visual.Camera#start
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* @function
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* @public
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* @return {Promise} promise fulfilled when the recording actually started
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*/
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start()
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{
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// if the camera is currently paused, a call to start resumes it
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// with a new recording:
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if (this._status === PsychoJS.Status.PAUSED)
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{
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return this.resume({clear: true});
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}
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if (this._status !== PsychoJS.Status.STARTED)
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{
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this._psychoJS.logger.debug("request to start video recording");
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try
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{
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if (!this._recorder)
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{
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throw "the recorder has not been created yet, possibly because the participant has not given the authorisation to record video";
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}
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this._recorder.start();
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// return a promise, which will be satisfied when the recording actually starts, which
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// is also when the reset of the clock and the change of status takes place
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const self = this;
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return new Promise((resolve, reject) =>
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{
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self._startCallback = resolve;
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self._errorCallback = reject;
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});
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}
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catch (error)
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{
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this._psychoJS.logger.error("unable to start the video recording: " + JSON.stringify(error));
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this._status = PsychoJS.Status.ERROR;
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throw {
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origin: "Camera.start",
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context: "when starting the video recording for camera: " + this._name,
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error
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};
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}
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}
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}
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/**
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* Submit a request to stop the recording.
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*
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* @name module:visual.Camera#stop
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* @function
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* @public
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* @param {Object} options
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* @param {string} [options.filename] the name of the file to which the video recording
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* will be saved
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* @return {Promise} promise fulfilled when the recording actually stopped, and the recorded
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* data was made available
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*/
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stop({filename} = {})
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{
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if (this._status === PsychoJS.Status.STARTED || this._status === PsychoJS.Status.PAUSED)
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{
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this._psychoJS.logger.debug("request to stop video recording");
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// stop the videos:
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for (const video of this._videos)
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{
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video.pause();
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}
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this._stopOptions = {
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filename
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};
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// note: calling the stop method of the MediaRecorder will first raise
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// a dataavailable event, and then a stop event
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// ref: https://developer.mozilla.org/en-US/docs/Web/API/MediaRecorder/stop
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this._recorder.stop();
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// return a promise, which will be satisfied when the recording actually stops and the data
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// has been made available:
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const self = this;
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return new Promise((resolve, reject) =>
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{
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self._stopCallback = resolve;
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self._errorCallback = reject;
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});
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}
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}
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/**
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* Submit a request to pause the recording.
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*
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* @name module:visual.Camera#pause
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* @function
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* @public
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* @return {Promise} promise fulfilled when the recording actually paused
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*/
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pause()
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{
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if (this._status === PsychoJS.Status.STARTED)
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{
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this._psychoJS.logger.debug("request to pause video recording");
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try
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{
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if (!this._recorder)
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{
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throw "the recorder has not been created yet, possibly because the participant has not given the authorisation to record video";
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}
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// note: calling the pause method of the MediaRecorder raises a pause event
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this._recorder.pause();
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// return a promise, which will be satisfied when the recording actually pauses:
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const self = this;
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return new Promise((resolve, reject) =>
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{
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self._pauseCallback = resolve;
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self._errorCallback = reject;
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});
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}
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catch (error)
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{
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self._psychoJS.logger.error("unable to pause the video recording: " + JSON.stringify(error));
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this._status = PsychoJS.Status.ERROR;
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throw {
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origin: "Camera.pause",
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context: "when pausing the video recording for camera: " + this._name,
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error
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};
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}
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}
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}
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/**
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* Submit a request to resume the recording.
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*
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* <p>resume has no effect if the recording was not previously paused.</p>
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*
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* @name module:visual.Camera#resume
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* @function
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* @param {Object} options
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* @param {boolean} [options.clear= false] whether or not to empty the video buffer before
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* resuming the recording
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* @return {Promise} promise fulfilled when the recording actually resumed
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*/
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resume({clear = false } = {})
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{
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if (this._status === PsychoJS.Status.PAUSED)
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{
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this._psychoJS.logger.debug("request to resume video recording");
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try
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{
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if (!this._recorder)
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{
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throw "the recorder has not been created yet, possibly because the participant has not given the authorisation to record video";
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}
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// empty the audio buffer is needed:
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if (clear)
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{
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this._audioBuffer = [];
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this._videoBuffer.length = 0;
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}
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this._recorder.resume();
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// return a promise, which will be satisfied when the recording actually resumes:
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const self = this;
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return new Promise((resolve, reject) =>
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{
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self._resumeCallback = resolve;
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self._errorCallback = reject;
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});
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}
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catch (error)
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{
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self._psychoJS.logger.error("unable to resume the video recording: " + JSON.stringify(error));
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this._status = PsychoJS.Status.ERROR;
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throw {
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origin: "Camera.resume",
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context: "when resuming the video recording for camera: " + this._name,
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error
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};
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}
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}
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}
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/**
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* Submit a request to flush the recording.
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*
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* @name module:visual.Camera#flush
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* @function
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* @public
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* @return {Promise} promise fulfilled when the data has actually been made available
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*/
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flush()
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{
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if (this._status === PsychoJS.Status.STARTED || this._status === PsychoJS.Status.PAUSED)
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{
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this._psychoJS.logger.debug("request to flush video recording");
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// note: calling the requestData method of the MediaRecorder will raise a
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// dataavailable event
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// ref: https://developer.mozilla.org/en-US/docs/Web/API/MediaRecorder/requestData
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this._recorder.requestData();
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// return a promise, which will be satisfied when the data has been made available:
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const self = this;
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return new Promise((resolve, reject) =>
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{
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self._dataAvailableCallback = resolve;
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self._errorCallback = reject;
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});
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}
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}
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/**
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* Offer the audio recording to the participant as a video file to download.
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*
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* @name module:visual.Camera#download
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* @function
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* @public
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* @param {string} filename - the filename of the video file
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*/
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download(filename = "video.webm")
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{
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const videoBlob = new Blob(this._videoBuffer);
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const anchor = document.createElement("a");
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anchor.href = window.URL.createObjectURL(videoBlob);
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anchor.download = filename;
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document.body.appendChild(anchor);
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anchor.click();
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document.body.removeChild(anchor);
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}
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/**
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* Upload the video recording to the pavlovia server.
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*
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* @name module:visual.Camera#upload
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* @function
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* @public
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* @param @param {Object} options
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* @param {string} options.tag an optional tag for the video file
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* @param {boolean} [options.waitForCompletion= false] whether or not to wait for completion
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* before returning
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* @param {boolean} [options.showDialog=false] - whether or not to open a dialog box to inform the participant to wait for the data to be uploaded to the server
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* @param {string} [options.dialogMsg=""] - default message informing the participant to wait for the data to be uploaded to the server
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*/
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async upload({tag, waitForCompletion = false, showDialog = false, dialogMsg = ""} = {})
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{
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// default tag: the name of this Camera object
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if (typeof tag === "undefined")
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{
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tag = this._name;
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}
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// add a format-dependent video extension to the tag:
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tag += util.extensionFromMimeType(this._format);
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// if the video recording cannot be uploaded, e.g. the experiment is running locally, or
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// if it is piloting mode, then we offer the video recording as a file for download:
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if (this._psychoJS.getEnvironment() !== ExperimentHandler.Environment.SERVER ||
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this._psychoJS.config.experiment.status !== "RUNNING" ||
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this._psychoJS._serverMsg.has("__pilotToken"))
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{
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return this.download(tag);
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}
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// upload the blob:
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const videoBlob = new Blob(this._videoBuffer);
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return this._psychoJS.serverManager.uploadAudioVideo({
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mediaBlob: videoBlob,
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tag,
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waitForCompletion,
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showDialog,
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dialogMsg});
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}
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/**
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* Get the current video recording as a VideoClip in the given format.
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*
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* @name module:visual.Camera#getRecording
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* @function
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* @public
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* @param {string} tag an optional tag for the video clip
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* @param {boolean} [flush=false] whether or not to first flush the recording
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*/
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async getRecording({tag, flush = false} = {})
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{
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// default tag: the name of this Microphone object
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if (typeof tag === "undefined")
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{
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tag = this._name;
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}
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// TODO
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}
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/**
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* Callback for changes to the recording settings.
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*
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* <p>Changes to the settings require the recording to stop and be re-started.</p>
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*
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* @name module:visual.Camera#_onChange
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* @function
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* @protected
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*/
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_onChange()
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{
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if (this._status === PsychoJS.Status.STARTED)
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{
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this.stop();
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}
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this._prepareRecording();
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this.start();
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}
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/**
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* Prepare the recording.
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*
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* @name module:visual.Camera#_prepareRecording
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* @function
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* @protected
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*/
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async _prepareRecording()
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{
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// empty the video buffer:
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this._videoBuffer = [];
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this._recorder = null;
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this._videos = [];
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// create a new stream with ideal dimensions:
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// TODO use size constraints
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this._stream = await navigator.mediaDevices.getUserMedia({
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video: true
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});
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// check the actual width and height:
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this._streamSettings = this._stream.getVideoTracks()[0].getSettings();
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this._psychoJS.logger.debug(`camera stream settings: ${JSON.stringify(this._streamSettings)}`);
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// check that the specified format is supported, use default if it is not:
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let options;
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if (typeof this._format === "string" && MediaRecorder.isTypeSupported(this._format))
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{
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options = { type: this._format };
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}
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else
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{
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this._psychoJS.logger.warn(`The specified video format, ${this._format}, is not supported by this browser, using the default format instead`);
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}
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// create a video recorder:
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this._recorder = new MediaRecorder(this._stream, options);
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// setup the callbacks:
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const self = this;
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// called upon Camera.start(), at which point the audio data starts being gathered
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// into a blob:
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this._recorder.onstart = () =>
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{
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self._videoBuffer = [];
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self._videoBuffer.length = 0;
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self._clock.reset();
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self._status = PsychoJS.Status.STARTED;
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self._psychoJS.logger.debug("video recording started");
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// resolve the Microphone.start promise:
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if (self._startCallback)
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{
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self._startCallback(self._psychoJS.monotonicClock.getTime());
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}
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};
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// called upon Camera.pause():
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this._recorder.onpause = () =>
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{
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self._status = PsychoJS.Status.PAUSED;
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self._psychoJS.logger.debug("video recording paused");
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// resolve the Microphone.pause promise:
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if (self._pauseCallback)
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{
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self._pauseCallback(self._psychoJS.monotonicClock.getTime());
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}
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};
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// called upon Camera.resume():
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this._recorder.onresume = () =>
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{
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self._status = PsychoJS.Status.STARTED;
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self._psychoJS.logger.debug("video recording resumed");
|
|
|
|
// resolve the Microphone.resume promise:
|
|
if (self._resumeCallback)
|
|
{
|
|
self._resumeCallback(self._psychoJS.monotonicClock.getTime());
|
|
}
|
|
};
|
|
|
|
// called when video data is available, typically upon Camera.stop() or Camera.flush():
|
|
this._recorder.ondataavailable = (event) =>
|
|
{
|
|
const data = event.data;
|
|
|
|
// add data to the buffer:
|
|
self._videoBuffer.push(data);
|
|
self._psychoJS.logger.debug("video data added to the buffer");
|
|
|
|
// resolve the data available promise, if needed:
|
|
if (self._dataAvailableCallback)
|
|
{
|
|
self._dataAvailableCallback(self._psychoJS.monotonicClock.getTime());
|
|
}
|
|
};
|
|
|
|
// called upon Camera.stop(), after data has been made available:
|
|
this._recorder.onstop = () =>
|
|
{
|
|
self._psychoJS.logger.debug("video recording stopped");
|
|
self._status = PsychoJS.Status.NOT_STARTED;
|
|
|
|
// resolve the Microphone.stop promise:
|
|
if (self._stopCallback)
|
|
{
|
|
self._stopCallback(self._psychoJS.monotonicClock.getTime());
|
|
}
|
|
|
|
// treat stop options if there are any:
|
|
|
|
// download to a file, immediately offered to the participant:
|
|
if (typeof self._stopOptions.filename === "string")
|
|
{
|
|
self.download(self._stopOptions.filename);
|
|
}
|
|
};
|
|
|
|
// called upon recording errors:
|
|
this._recorder.onerror = (event) =>
|
|
{
|
|
// TODO
|
|
self._psychoJS.logger.error("video recording error: " + JSON.stringify(event));
|
|
self._status = PsychoJS.Status.ERROR;
|
|
};
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
</code></pre>
|
|
</article>
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</section>
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