mirror of
https://github.com/scratchfoundation/scratch-vm.git
synced 2024-12-23 14:32:59 -05:00
Merge pull request #1016 from gnarf/io-video
Video IO Device Implementation
This commit is contained in:
Michael "Z" Goddard
GitHub
commit
044370790c
5 changed files with 504 additions and 162 deletions
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@ -19,6 +19,7 @@ const DeviceManager = require('../io/deviceManager');
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const Keyboard = require('../io/keyboard');
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const Mouse = require('../io/mouse');
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const MouseWheel = require('../io/mouseWheel');
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const Video = require('../io/video');
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const defaultBlockPackages = {
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scratch3_control: require('../blocks/scratch3_control'),
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@ -248,7 +249,8 @@ class Runtime extends EventEmitter {
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deviceManager: new DeviceManager(),
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keyboard: new Keyboard(this),
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mouse: new Mouse(this),
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mouseWheel: new MouseWheel(this)
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mouseWheel: new MouseWheel(this),
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video: new Video(this)
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};
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/**
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@ -3,10 +3,26 @@ const Runtime = require('../../engine/runtime');
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const ArgumentType = require('../../extension-support/argument-type');
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const BlockType = require('../../extension-support/block-type');
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const Clone = require('../../util/clone');
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const log = require('../../util/log');
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const Video = require('../../io/video');
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const VideoMotion = require('./library');
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/**
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* States the video sensing activity can be set to.
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* @readonly
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* @enum {string}
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*/
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const VideoState = {
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/** Video turned off. */
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OFF: 'off',
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/** Video turned on with default y axis mirroring. */
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ON: 'on',
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/** Video turned on without default y axis mirroring. */
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ON_FLIPPED: 'on-flipped'
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};
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/**
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* Class for the motion-related blocks in Scratch 3.0
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* @param {Runtime} runtime - the runtime instantiating this block package.
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@ -34,39 +50,6 @@ class Scratch3VideoSensingBlocks {
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*/
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this._lastUpdate = null;
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/**
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* Id representing a Scratch Renderer skin the video is rendered to for
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* previewing.
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* @type {number}
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*/
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this._skinId = -1;
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/**
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* The Scratch Renderer Skin object.
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* @type {Skin}
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*/
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this._skin = null;
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/**
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* Id for a drawable using the video's skin that will render as a video
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* preview.
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* @type {Drawable}
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*/
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this._drawable = -1;
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/**
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* Canvas DOM element video is rendered to down or up sample to the
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* expected resolution.
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* @type {HTMLCanvasElement}
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*/
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this._sampleCanvas = null;
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/**
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* Canvas 2D Context to render to the _sampleCanvas member.
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* @type {CanvasRenderingContext2D}
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*/
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this._sampleContext = null;
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if (this.runtime.ioDevices) {
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// Clear target motion state values when the project starts.
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this.runtime.on(Runtime.PROJECT_RUN_START, this.reset.bind(this));
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@ -74,9 +57,6 @@ class Scratch3VideoSensingBlocks {
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// Boot up the video, canvas to down/up sample the video stream, the
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// preview skin and drawable, and kick off looping the analysis
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// logic.
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this._setupVideo();
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this._setupSampleCanvas();
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this._setupPreview();
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this._loop();
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}
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}
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@ -99,14 +79,6 @@ class Scratch3VideoSensingBlocks {
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return [480, 360];
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}
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/**
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* Order preview drawable is inserted at in the renderer.
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* @type {number}
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*/
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static get ORDER () {
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return 1;
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}
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/**
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* The key to load & store a target's motion-related state.
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* @type {string}
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@ -145,127 +117,29 @@ class Scratch3VideoSensingBlocks {
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}
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}
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/**
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* Setup a video element connected to a user media stream.
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* @private
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*/
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_setupVideo () {
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this._video = document.createElement('video');
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navigator.getUserMedia({
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audio: false,
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video: {
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width: {min: 480, ideal: 640},
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height: {min: 360, ideal: 480}
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}
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}, stream => {
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this._video.src = window.URL.createObjectURL(stream);
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// Hint to the stream that it should load. A standard way to do this
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// is add the video tag to the DOM. Since this extension wants to
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// hide the video tag and instead render a sample of the stream into
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// the webgl rendered Scratch canvas, another hint like this one is
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// needed.
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this._track = stream.getTracks()[0];
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}, err => {
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// @todo Properly handle errors
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log(err);
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});
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}
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/**
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* Create a campus to render the user media video to down/up sample to the
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* needed resolution.
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* @private
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*/
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_setupSampleCanvas () {
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// Create low-resolution image to sample video for analysis and preview
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const canvas = this._sampleCanvas = document.createElement('canvas');
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canvas.width = Scratch3VideoSensingBlocks.DIMENSIONS[0];
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canvas.height = Scratch3VideoSensingBlocks.DIMENSIONS[1];
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this._sampleContext = canvas.getContext('2d');
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}
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/**
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* Create a Scratch Renderer Skin and Drawable to preview the user media
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* video stream.
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* @private
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*/
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_setupPreview () {
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if (this._skinId !== -1) return;
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if (this._skin !== null) return;
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if (this._drawable !== -1) return;
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if (!this.runtime.renderer) return;
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this._skinId = this.runtime.renderer.createPenSkin();
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this._skin = this.runtime.renderer._allSkins[this._skinId];
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this._drawable = this.runtime.renderer.createDrawable();
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this.runtime.renderer.setDrawableOrder(
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this._drawable,
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Scratch3VideoSensingBlocks.ORDER
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);
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this.runtime.renderer.updateDrawableProperties(this._drawable, {
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skinId: this._skinId
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});
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}
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/**
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* Occasionally step a loop to sample the video, stamp it to the preview
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* skin, and add a TypedArray copy of the canvas's pixel data.
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* @private
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*/
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_loop () {
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setTimeout(this._loop.bind(this), this.runtime.currentStepTime);
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// Ensure video stream is established
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if (!this._video) return;
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if (!this._track) return;
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if (typeof this._video.videoWidth !== 'number') return;
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if (typeof this._video.videoHeight !== 'number') return;
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// Bail if the camera is *still* not ready
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const nativeWidth = this._video.videoWidth;
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const nativeHeight = this._video.videoHeight;
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if (nativeWidth === 0) return;
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if (nativeHeight === 0) return;
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const ctx = this._sampleContext;
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// Mirror
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ctx.scale(-1, 1);
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// Generate video thumbnail for analysis
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ctx.drawImage(
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this._video,
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0,
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0,
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nativeWidth,
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nativeHeight,
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Scratch3VideoSensingBlocks.DIMENSIONS[0] * -1,
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0,
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Scratch3VideoSensingBlocks.DIMENSIONS[0],
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Scratch3VideoSensingBlocks.DIMENSIONS[1]
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);
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// Restore the canvas transform
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ctx.resetTransform();
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// Render to preview layer
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if (this._skin !== null) {
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const xOffset = Scratch3VideoSensingBlocks.DIMENSIONS[0] / 2 * -1;
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const yOffset = Scratch3VideoSensingBlocks.DIMENSIONS[1] / 2;
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this._skin.drawStamp(this._sampleCanvas, xOffset, yOffset);
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this.runtime.requestRedraw();
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}
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setTimeout(this._loop.bind(this), Math.max(this.runtime.currentStepTime, Scratch3VideoSensingBlocks.INTERVAL));
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// Add frame to detector
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const time = Date.now();
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if (this._lastUpdate === null) this._lastUpdate = time;
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if (this._lastUpdate === null) {
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this._lastUpdate = time;
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}
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const offset = time - this._lastUpdate;
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if (offset > Scratch3VideoSensingBlocks.INTERVAL) {
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this._lastUpdate = time;
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const data = ctx.getImageData(
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0, 0, Scratch3VideoSensingBlocks.DIMENSIONS[0], Scratch3VideoSensingBlocks.DIMENSIONS[1]
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);
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this.detect.addFrame(data.data);
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const frame = this.runtime.ioDevices.video.getFrame({
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format: Video.FORMAT_IMAGE_DATA,
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dimensions: Scratch3VideoSensingBlocks.DIMENSIONS
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});
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if (frame) {
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this._lastUpdate = time;
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this.detect.addFrame(frame.data);
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}
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}
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}
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@ -282,7 +156,7 @@ class Scratch3VideoSensingBlocks {
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return info.map((entry, index) => {
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const obj = {};
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obj.text = entry.name;
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obj.value = String(index + 1);
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obj.value = entry.value || String(index + 1);
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return obj;
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});
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}
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@ -355,6 +229,38 @@ class Scratch3VideoSensingBlocks {
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return 2;
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}
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/**
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* States the video sensing activity can be set to.
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* @readonly
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* @enum {string}
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*/
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static get VideoState () {
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return VideoState;
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}
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/**
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* An array of info on video state options for the "turn video [STATE]" block.
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* @type {object[]} an array of objects
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* @param {string} name - the translatable name to display in the video state menu
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* @param {string} value - the serializable value stored in the block
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*/
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get VIDEO_STATE_INFO () {
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return [
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{
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name: 'off',
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value: VideoState.OFF
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},
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{
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name: 'on',
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value: VideoState.ON
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},
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{
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name: 'on flipped',
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value: VideoState.ON_FLIPPED
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}
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];
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}
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/**
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* @returns {object} metadata for this extension and its blocks.
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*/
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@ -392,11 +298,33 @@ class Scratch3VideoSensingBlocks {
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defaultValue: 10
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}
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}
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},
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{
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opcode: 'videoToggle',
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text: 'turn video [VIDEO_STATE]',
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arguments: {
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VIDEO_STATE: {
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type: ArgumentType.NUMBER,
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menu: 'VIDEO_STATE',
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defaultValue: VideoState.ON
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}
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}
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},
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{
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opcode: 'setVideoTransparency',
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text: 'set video transparency to [TRANSPARENCY]',
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arguments: {
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TRANSPARENCY: {
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type: ArgumentType.NUMBER,
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defaultValue: 0
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}
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}
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}
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],
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menus: {
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MOTION_DIRECTION: this._buildMenu(this.MOTION_DIRECTION_INFO),
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STAGE_SPRITE: this._buildMenu(this.STAGE_SPRITE_INFO)
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STAGE_SPRITE: this._buildMenu(this.STAGE_SPRITE_INFO),
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VIDEO_STATE: this._buildMenu(this.VIDEO_STATE_INFO)
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}
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};
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}
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@ -449,6 +377,34 @@ class Scratch3VideoSensingBlocks {
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const state = this._analyzeLocalMotion(util.target);
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return state.motionAmount > Number(args.REFERENCE);
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}
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/**
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* A scratch command block handle that configures the video state from
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* passed arguments.
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* @param {object} args - the block arguments
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* @param {VideoState} args.VIDEO_STATE - the video state to set the device to
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*/
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videoToggle (args) {
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const state = args.VIDEO_STATE;
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if (state === VideoState.OFF) {
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this.runtime.ioDevices.video.disableVideo();
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} else {
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this.runtime.ioDevices.video.enableVideo();
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// Mirror if state is ON. Do not mirror if state is ON_FLIPPED.
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this.runtime.ioDevices.video.mirror = state === VideoState.ON;
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}
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}
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/**
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* A scratch command block handle that configures the video preview's
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* transparency from passed arguments.
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* @param {object} args - the block arguments
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* @param {number} args.TRANSPARENCY - the transparency to set the video
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* preview to
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*/
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setVideoTransparency (args) {
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this.runtime.ioDevices.video.setPreviewGhost(Number(args.TRANSPARENCY));
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}
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}
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module.exports = Scratch3VideoSensingBlocks;
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380
src/io/video.js
Normal file
380
src/io/video.js
Normal file
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@ -0,0 +1,380 @@
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const log = require('../util/log');
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class Video {
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constructor (runtime) {
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/**
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* Reference to the owning Runtime.
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* @type{!Runtime}
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*/
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this.runtime = runtime;
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/**
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* Default value for mirrored frames.
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* @type boolean
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*/
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this.mirror = true;
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/**
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* Cache frames for this many ms.
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* @type number
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*/
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this._frameCacheTimeout = 16;
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/**
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* DOM Video element
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* @private
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*/
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this._video = null;
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/**
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* Usermedia stream track
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* @private
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*/
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this._track = null;
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/**
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* Stores some canvas/frame data per resolution/mirror states
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*/
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this._workspace = [];
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/**
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* Id representing a Scratch Renderer skin the video is rendered to for
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* previewing.
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* @type {number}
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*/
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this._skinId = -1;
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/**
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* The Scratch Renderer Skin object.
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* @type {Skin}
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*/
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this._skin = null;
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/**
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* Id for a drawable using the video's skin that will render as a video
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* preview.
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* @type {Drawable}
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*/
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this._drawable = -1;
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/**
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* Store the last state of the video transparency ghost effect
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* @type {number}
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*/
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this._ghost = 0;
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}
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static get FORMAT_IMAGE_DATA () {
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return 'image-data';
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}
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static get FORMAT_CANVAS () {
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return 'canvas';
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}
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/**
|
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* Dimensions the video stream is analyzed at after its rendered to the
|
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* sample canvas.
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* @type {Array.<number>}
|
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*/
|
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static get DIMENSIONS () {
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return [480, 360];
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}
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/**
|
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* Order preview drawable is inserted at in the renderer.
|
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* @type {number}
|
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*/
|
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static get ORDER () {
|
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return 1;
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}
|
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|
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/**
|
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* Request video be enabled. Sets up video, creates video skin and enables preview.
|
||||
*
|
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* ioDevices.video.requestVideo()
|
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*
|
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* @return {Promise.<Video>} resolves a promise to this IO device when video is ready.
|
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*/
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enableVideo () {
|
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this.enabled = true;
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return this._setupVideo();
|
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}
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/**
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* Disable video stream (turn video off)
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*/
|
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disableVideo () {
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this.enabled = false;
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// If we have begun a setup process, call _teardown after it completes
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if (this._singleSetup) {
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this._singleSetup
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.then(this._teardown.bind(this))
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.catch(err => this.onError(err));
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}
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}
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|
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/**
|
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* async part of disableVideo
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* @private
|
||||
*/
|
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_teardown () {
|
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// we might be asked to re-enable before _teardown is called, just ignore it.
|
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if (this.enabled === false) {
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this._disablePreview();
|
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this._singleSetup = null;
|
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// by clearing refs to video and track, we should lose our hold over the camera
|
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this._video = null;
|
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if (this._track) {
|
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this._track.stop();
|
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}
|
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this._track = null;
|
||||
}
|
||||
}
|
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/**
|
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* Return frame data from the video feed in a specified dimensions, format, and mirroring.
|
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*
|
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* @param {object} frameInfo A descriptor of the frame you would like to receive.
|
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* @param {Array.<number>} frameInfo.dimensions [width, height] array of numbers. Defaults to [480,360]
|
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* @param {boolean} frameInfo.mirror If you specificly want a mirror/non-mirror frame, defaults to the global
|
||||
* mirror state (ioDevices.video.mirror)
|
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* @param {string} frameInfo.format Requested video format, available formats are 'image-data' and 'canvas'.
|
||||
* @param {number} frameInfo.cacheTimeout Will reuse previous image data if the time since capture is less than
|
||||
* the cacheTimeout. Defaults to 16ms.
|
||||
*
|
||||
* @return {ArrayBuffer|Canvas|string|null} Frame data in requested format, null when errors.
|
||||
*/
|
||||
getFrame ({
|
||||
dimensions = Video.DIMENSIONS,
|
||||
mirror = this.mirror,
|
||||
format = Video.FORMAT_IMAGE_DATA,
|
||||
cacheTimeout = this._frameCacheTimeout
|
||||
}) {
|
||||
if (!this.videoReady) {
|
||||
return null;
|
||||
}
|
||||
const [width, height] = dimensions;
|
||||
const workspace = this._getWorkspace({dimensions, mirror: Boolean(mirror)});
|
||||
const {videoWidth, videoHeight} = this._video;
|
||||
const {canvas, context, lastUpdate, cacheData} = workspace;
|
||||
const now = Date.now();
|
||||
|
||||
// if the canvas hasn't been updated...
|
||||
if (lastUpdate + cacheTimeout < now) {
|
||||
|
||||
if (mirror) {
|
||||
context.scale(-1, 1);
|
||||
context.translate(width * -1, 0);
|
||||
}
|
||||
|
||||
context.drawImage(this._video,
|
||||
// source x, y, width, height
|
||||
0, 0, videoWidth, videoHeight,
|
||||
// dest x, y, width, height
|
||||
0, 0, width, height
|
||||
);
|
||||
|
||||
context.resetTransform();
|
||||
workspace.lastUpdate = now;
|
||||
}
|
||||
|
||||
// each data type has it's own data cache, but the canvas is the same
|
||||
if (!cacheData[format]) {
|
||||
cacheData[format] = {lastUpdate: 0};
|
||||
}
|
||||
const formatCache = cacheData[format];
|
||||
|
||||
if (formatCache.lastUpdate + cacheTimeout < now) {
|
||||
if (format === Video.FORMAT_IMAGE_DATA) {
|
||||
formatCache.lastData = context.getImageData(0, 0, width, height);
|
||||
} else if (format === Video.FORMAT_CANVAS) {
|
||||
// this will never change
|
||||
formatCache.lastUpdate = Infinity;
|
||||
formatCache.lastData = canvas;
|
||||
} else {
|
||||
log.error(`video io error - unimplemented format ${format}`);
|
||||
// cache the null result forever, don't log about it again..
|
||||
formatCache.lastUpdate = Infinity;
|
||||
formatCache.lastData = null;
|
||||
}
|
||||
|
||||
// rather than set to now, this data is as stale as it's canvas is
|
||||
formatCache.lastUpdate = Math.max(workspace.lastUpdate, formatCache.lastUpdate);
|
||||
}
|
||||
|
||||
return formatCache.lastData;
|
||||
}
|
||||
|
||||
/**
|
||||
* Set the preview ghost effect
|
||||
* @param {number} ghost from 0 (visible) to 100 (invisible) - ghost effect
|
||||
*/
|
||||
setPreviewGhost (ghost) {
|
||||
this._ghost = ghost;
|
||||
if (this._drawable) {
|
||||
this.runtime.renderer.updateDrawableProperties(this._drawable, {ghost});
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Method called when an error happens. Default implementation is just to log error.
|
||||
*
|
||||
* @abstract
|
||||
* @param {Error} error An error object from getUserMedia or other source of error.
|
||||
*/
|
||||
onError (error) {
|
||||
log.error('Unhandled video io device error', error);
|
||||
}
|
||||
|
||||
/**
|
||||
* Create a video stream.
|
||||
* Should probably be moved to -render or somewhere similar later
|
||||
* @private
|
||||
* @return {Promise} When video has been received, rejected if video is not received
|
||||
*/
|
||||
_setupVideo () {
|
||||
// We cache the result of this setup so that we can only ever have a single
|
||||
// video/getUserMedia request happen at a time.
|
||||
if (this._singleSetup) {
|
||||
return this._singleSetup;
|
||||
}
|
||||
|
||||
this._singleSetup = new Promise((resolve, reject) => {
|
||||
navigator.getUserMedia({
|
||||
audio: false,
|
||||
video: {
|
||||
width: {min: 480, ideal: 640},
|
||||
height: {min: 360, ideal: 480}
|
||||
}
|
||||
}, resolve, reject);
|
||||
})
|
||||
.then(stream => {
|
||||
this._video = document.createElement('video');
|
||||
this._video.src = window.URL.createObjectURL(stream);
|
||||
// Hint to the stream that it should load. A standard way to do this
|
||||
// is add the video tag to the DOM. Since this extension wants to
|
||||
// hide the video tag and instead render a sample of the stream into
|
||||
// the webgl rendered Scratch canvas, another hint like this one is
|
||||
// needed.
|
||||
this._track = stream.getTracks()[0];
|
||||
this._setupPreview();
|
||||
return this;
|
||||
})
|
||||
.catch(error => {
|
||||
this._singleSetup = null;
|
||||
this.onError(error);
|
||||
});
|
||||
|
||||
return this._singleSetup;
|
||||
}
|
||||
|
||||
_disablePreview () {
|
||||
if (this._skin) {
|
||||
this._skin.clear();
|
||||
this.runtime.renderer.updateDrawableProperties(this._drawable, {visible: false});
|
||||
}
|
||||
this._renderPreviewFrame = null;
|
||||
}
|
||||
|
||||
_setupPreview () {
|
||||
const {renderer} = this.runtime;
|
||||
if (!renderer) return;
|
||||
|
||||
if (this._skinId === -1 && this._skin === null && this._drawable === -1) {
|
||||
this._skinId = renderer.createPenSkin();
|
||||
this._skin = renderer._allSkins[this._skinId];
|
||||
this._drawable = renderer.createDrawable();
|
||||
renderer.setDrawableOrder(
|
||||
this._drawable,
|
||||
Video.ORDER
|
||||
);
|
||||
renderer.updateDrawableProperties(this._drawable, {
|
||||
skinId: this._skinId
|
||||
});
|
||||
}
|
||||
|
||||
// if we haven't already created and started a preview frame render loop, do so
|
||||
if (!this._renderPreviewFrame) {
|
||||
renderer.updateDrawableProperties(this._drawable, {
|
||||
ghost: this._ghost,
|
||||
visible: true
|
||||
});
|
||||
|
||||
this._renderPreviewFrame = () => {
|
||||
clearTimeout(this._renderPreviewTimeout);
|
||||
if (!this._renderPreviewFrame) {
|
||||
return;
|
||||
}
|
||||
|
||||
this._renderPreviewTimeout = setTimeout(this._renderPreviewFrame, this.runtime.currentStepTime);
|
||||
|
||||
const canvas = this.getFrame({format: Video.FORMAT_CANVAS});
|
||||
|
||||
if (!canvas) {
|
||||
this._skin.clear();
|
||||
return;
|
||||
}
|
||||
|
||||
const xOffset = Video.DIMENSIONS[0] / -2;
|
||||
const yOffset = Video.DIMENSIONS[1] / 2;
|
||||
this._skin.drawStamp(canvas, xOffset, yOffset);
|
||||
this.runtime.requestRedraw();
|
||||
};
|
||||
|
||||
this._renderPreviewFrame();
|
||||
}
|
||||
}
|
||||
|
||||
get videoReady () {
|
||||
if (!this.enabled) {
|
||||
return false;
|
||||
}
|
||||
if (!this._video) {
|
||||
return false;
|
||||
}
|
||||
if (!this._track) {
|
||||
return false;
|
||||
}
|
||||
const {videoWidth, videoHeight} = this._video;
|
||||
if (typeof videoWidth !== 'number' || typeof videoHeight !== 'number') {
|
||||
return false;
|
||||
}
|
||||
if (videoWidth === 0 || videoHeight === 0) {
|
||||
return false;
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
/**
|
||||
* get an internal workspace for canvas/context/caches
|
||||
* this uses some document stuff to create a canvas and what not, probably needs abstraction
|
||||
* into the renderer layer?
|
||||
* @private
|
||||
* @return {object} A workspace for canvas/data storage. Internal format not documented intentionally
|
||||
*/
|
||||
_getWorkspace ({dimensions, mirror}) {
|
||||
let workspace = this._workspace.find(space => (
|
||||
space.dimensions.join('-') === dimensions.join('-') &&
|
||||
space.mirror === mirror
|
||||
));
|
||||
if (!workspace) {
|
||||
workspace = {
|
||||
dimensions,
|
||||
mirror,
|
||||
canvas: document.createElement('canvas'),
|
||||
lastUpdate: 0,
|
||||
cacheData: {}
|
||||
};
|
||||
workspace.canvas.width = dimensions[0];
|
||||
workspace.canvas.height = dimensions[1];
|
||||
workspace.context = workspace.canvas.getContext('2d');
|
||||
this._workspace.push(workspace);
|
||||
}
|
||||
return workspace;
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
|
||||
module.exports = Video;
|
||||
|
|
@ -627,6 +627,10 @@ const parseBlock = function (sb2block, addBroadcastMsg, getVariableId, extension
|
|||
} else if (fieldValue === 'this sprite') {
|
||||
fieldValue = 2;
|
||||
}
|
||||
} else if (expectedArg.inputOp === 'videoSensing.menu.VIDEO_STATE') {
|
||||
if (shadowObscured) {
|
||||
fieldValue = 'on';
|
||||
}
|
||||
} else if (shadowObscured) {
|
||||
// Filled drop-down menu.
|
||||
fieldValue = '';
|
||||
|
|
|
|||
|
|
@ -980,17 +980,17 @@ const specMap = {
|
|||
// ]
|
||||
// },
|
||||
'setVideoState': {
|
||||
opcode: 'sensing_videotoggle',
|
||||
opcode: 'videoSensing.videoToggle',
|
||||
argMap: [
|
||||
{
|
||||
type: 'input',
|
||||
inputOp: 'sensing_videotogglemenu',
|
||||
inputName: 'VIDEOTOGGLEMENU'
|
||||
inputOp: 'videoSensing.menu.VIDEO_STATE',
|
||||
inputName: 'VIDEO_STATE'
|
||||
}
|
||||
]
|
||||
},
|
||||
'setVideoTransparency': {
|
||||
opcode: 'sensing_setvideotransparency',
|
||||
opcode: 'videoSensing.setVideoTransparency',
|
||||
argMap: [
|
||||
{
|
||||
type: 'input',
|
||||
|
|
|
|||
Loading…
Reference in a new issue