eewing
1203 lines
55 KiB
JavaScript
1203 lines
55 KiB
JavaScript
"use strict";
|
||
var __assign = (this && this.__assign) || function () {
|
||
__assign = Object.assign || function(t) {
|
||
for (var s, i = 1, n = arguments.length; i < n; i++) {
|
||
s = arguments[i];
|
||
for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
|
||
t[p] = s[p];
|
||
}
|
||
return t;
|
||
};
|
||
return __assign.apply(this, arguments);
|
||
};
|
||
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
|
||
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
|
||
return new (P || (P = Promise))(function (resolve, reject) {
|
||
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
|
||
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
|
||
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
|
||
step((generator = generator.apply(thisArg, _arguments || [])).next());
|
||
});
|
||
};
|
||
var __generator = (this && this.__generator) || function (thisArg, body) {
|
||
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
|
||
return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
|
||
function verb(n) { return function (v) { return step([n, v]); }; }
|
||
function step(op) {
|
||
if (f) throw new TypeError("Generator is already executing.");
|
||
while (_) try {
|
||
if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
|
||
if (y = 0, t) op = [op[0] & 2, t.value];
|
||
switch (op[0]) {
|
||
case 0: case 1: t = op; break;
|
||
case 4: _.label++; return { value: op[1], done: false };
|
||
case 5: _.label++; y = op[1]; op = [0]; continue;
|
||
case 7: op = _.ops.pop(); _.trys.pop(); continue;
|
||
default:
|
||
if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
|
||
if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
|
||
if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
|
||
if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
|
||
if (t[2]) _.ops.pop();
|
||
_.trys.pop(); continue;
|
||
}
|
||
op = body.call(thisArg, _);
|
||
} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
|
||
if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
|
||
}
|
||
};
|
||
var __values = (this && this.__values) || function(o) {
|
||
var s = typeof Symbol === "function" && Symbol.iterator, m = s && o[s], i = 0;
|
||
if (m) return m.call(o);
|
||
if (o && typeof o.length === "number") return {
|
||
next: function () {
|
||
if (o && i >= o.length) o = void 0;
|
||
return { value: o && o[i++], done: !o };
|
||
}
|
||
};
|
||
throw new TypeError(s ? "Object is not iterable." : "Symbol.iterator is not defined.");
|
||
};
|
||
Object.defineProperty(exports, "__esModule", { value: true });
|
||
exports.BrowserCodeReader = void 0;
|
||
var library_1 = require("@zxing/library");
|
||
var HTMLCanvasElementLuminanceSource_1 = require("../common/HTMLCanvasElementLuminanceSource");
|
||
var navigator_utils_1 = require("../common/navigator-utils");
|
||
var defaultOptions = {
|
||
delayBetweenScanAttempts: 500,
|
||
delayBetweenScanSuccess: 500,
|
||
tryPlayVideoTimeout: 5000,
|
||
};
|
||
/**
|
||
* Base class for browser code reader.
|
||
*/
|
||
var BrowserCodeReader = /** @class */ (function () {
|
||
/**
|
||
* Creates an instance of BrowserCodeReader.
|
||
* @param {Reader} reader The reader instance to decode the barcode
|
||
* @param hints Holds the hints the user sets for the Reader.
|
||
*/
|
||
function BrowserCodeReader(reader, hints, options) {
|
||
if (hints === void 0) { hints = new Map(); }
|
||
if (options === void 0) { options = {}; }
|
||
this.reader = reader;
|
||
this.hints = hints;
|
||
this.options = __assign(__assign({}, defaultOptions), options);
|
||
}
|
||
Object.defineProperty(BrowserCodeReader.prototype, "possibleFormats", {
|
||
/**
|
||
* Allows to change the possible formats the decoder should
|
||
* search for while scanning some image. Useful for changing
|
||
* the possible formats during BrowserCodeReader::scan.
|
||
*/
|
||
set: function (formats) {
|
||
this.hints.set(library_1.DecodeHintType.POSSIBLE_FORMATS, formats);
|
||
},
|
||
enumerable: false,
|
||
configurable: true
|
||
});
|
||
/**
|
||
* Defines what the videoElement src will be.
|
||
*
|
||
* @param videoElement
|
||
* @param stream The stream to be added as a source.
|
||
*/
|
||
BrowserCodeReader.addVideoSource = function (videoElement, stream) {
|
||
// Older browsers may not have `srcObject`
|
||
try {
|
||
// @note Throws Exception if interrupted by a new loaded request
|
||
videoElement.srcObject = stream;
|
||
}
|
||
catch (err) {
|
||
console.error("got interrupted by new loading request");
|
||
}
|
||
};
|
||
/**
|
||
* Enables or disables the torch in a media stream.
|
||
*
|
||
* @experimental This doesn't work across all browsers and is still a Draft.
|
||
*/
|
||
BrowserCodeReader.mediaStreamSetTorch = function (track, onOff) {
|
||
return __awaiter(this, void 0, void 0, function () {
|
||
return __generator(this, function (_a) {
|
||
switch (_a.label) {
|
||
case 0: return [4 /*yield*/, track.applyConstraints({
|
||
advanced: [{
|
||
fillLightMode: onOff ? 'flash' : 'off',
|
||
torch: onOff ? true : false,
|
||
}],
|
||
})];
|
||
case 1:
|
||
_a.sent();
|
||
return [2 /*return*/];
|
||
}
|
||
});
|
||
});
|
||
};
|
||
/**
|
||
* Checks if the stream has torch support.
|
||
*/
|
||
BrowserCodeReader.mediaStreamIsTorchCompatible = function (params) {
|
||
var e_1, _a;
|
||
var tracks = params.getVideoTracks();
|
||
try {
|
||
for (var tracks_1 = __values(tracks), tracks_1_1 = tracks_1.next(); !tracks_1_1.done; tracks_1_1 = tracks_1.next()) {
|
||
var track = tracks_1_1.value;
|
||
if (BrowserCodeReader.mediaStreamIsTorchCompatibleTrack(track)) {
|
||
return true;
|
||
}
|
||
}
|
||
}
|
||
catch (e_1_1) { e_1 = { error: e_1_1 }; }
|
||
finally {
|
||
try {
|
||
if (tracks_1_1 && !tracks_1_1.done && (_a = tracks_1.return)) _a.call(tracks_1);
|
||
}
|
||
finally { if (e_1) throw e_1.error; }
|
||
}
|
||
return false;
|
||
};
|
||
/**
|
||
*
|
||
* @param track The media stream track that will be checked for compatibility.
|
||
*/
|
||
BrowserCodeReader.mediaStreamIsTorchCompatibleTrack = function (track) {
|
||
try {
|
||
var capabilities = track.getCapabilities();
|
||
return 'torch' in capabilities;
|
||
}
|
||
catch (err) {
|
||
// some browsers may not be compatible with ImageCapture
|
||
// so we are ignoring this for now.
|
||
// tslint:disable-next-line:no-console
|
||
console.error(err);
|
||
// tslint:disable-next-line:no-console
|
||
console.warn('Your browser may be not fully compatible with WebRTC and/or ImageCapture specs. Torch will not be available.');
|
||
return false;
|
||
}
|
||
};
|
||
/**
|
||
* Checks if the given video element is currently playing.
|
||
*/
|
||
BrowserCodeReader.isVideoPlaying = function (video) {
|
||
return video.currentTime > 0 && !video.paused && video.readyState > 2;
|
||
};
|
||
/**
|
||
* Searches and validates a media element.
|
||
*/
|
||
BrowserCodeReader.getMediaElement = function (mediaElementId, type) {
|
||
var mediaElement = document.getElementById(mediaElementId);
|
||
if (!mediaElement) {
|
||
throw new library_1.ArgumentException("element with id '".concat(mediaElementId, "' not found"));
|
||
}
|
||
if (mediaElement.nodeName.toLowerCase() !== type.toLowerCase()) {
|
||
throw new library_1.ArgumentException("element with id '".concat(mediaElementId, "' must be an ").concat(type, " element"));
|
||
}
|
||
return mediaElement;
|
||
};
|
||
/**
|
||
* Receives a source and makes sure to return a Video Element from it or fail.
|
||
*/
|
||
BrowserCodeReader.createVideoElement = function (videoThingy) {
|
||
if (videoThingy instanceof HTMLVideoElement) {
|
||
return videoThingy;
|
||
}
|
||
if (typeof videoThingy === 'string') {
|
||
return BrowserCodeReader.getMediaElement(videoThingy, 'video');
|
||
}
|
||
if (!videoThingy && typeof document !== 'undefined') {
|
||
var videoElement = document.createElement('video');
|
||
videoElement.width = 200;
|
||
videoElement.height = 200;
|
||
return videoElement;
|
||
}
|
||
throw new Error('Couldn\'t get videoElement from videoSource!');
|
||
};
|
||
/**
|
||
* Receives a source and makes sure to return an Image Element from it or fail.
|
||
*/
|
||
BrowserCodeReader.prepareImageElement = function (imageSource) {
|
||
if (imageSource instanceof HTMLImageElement) {
|
||
return imageSource;
|
||
}
|
||
if (typeof imageSource === 'string') {
|
||
return BrowserCodeReader.getMediaElement(imageSource, 'img');
|
||
}
|
||
if (typeof imageSource === 'undefined') {
|
||
var imageElement = document.createElement('img');
|
||
imageElement.width = 200;
|
||
imageElement.height = 200;
|
||
return imageElement;
|
||
}
|
||
throw new Error('Couldn\'t get imageElement from imageSource!');
|
||
};
|
||
/**
|
||
* Sets a HTMLVideoElement for scanning or creates a new one.
|
||
*
|
||
* @param videoElem The HTMLVideoElement to be set.
|
||
*/
|
||
BrowserCodeReader.prepareVideoElement = function (videoElem) {
|
||
var videoElement = BrowserCodeReader.createVideoElement(videoElem);
|
||
// @todo the following lines should not always be done this way, should conditionally
|
||
// change according were we created the element or not
|
||
// Needed for iOS 11
|
||
videoElement.setAttribute('autoplay', 'true');
|
||
videoElement.setAttribute('muted', 'true');
|
||
videoElement.setAttribute('playsinline', 'true');
|
||
return videoElement;
|
||
};
|
||
/**
|
||
* Checks if and HTML image is loaded.
|
||
*/
|
||
BrowserCodeReader.isImageLoaded = function (img) {
|
||
// During the onload event, IE correctly identifies any images that
|
||
// weren't downloaded as not complete. Others should too. Gecko-based
|
||
// browsers act like NS4 in that they report this incorrectly.
|
||
if (!img.complete) {
|
||
return false;
|
||
}
|
||
// However, they do have two very useful properties: naturalWidth and
|
||
// naturalHeight. These give the true size of the image. If it failed
|
||
// to load, either of these should be zero.
|
||
if (img.naturalWidth === 0) {
|
||
return false;
|
||
}
|
||
// No other way of checking: assume it’s ok.
|
||
return true;
|
||
};
|
||
/**
|
||
* Creates a binaryBitmap based in a canvas.
|
||
*
|
||
* @param canvas HTML canvas element containing the image source draw.
|
||
*/
|
||
BrowserCodeReader.createBinaryBitmapFromCanvas = function (canvas) {
|
||
var luminanceSource = new HTMLCanvasElementLuminanceSource_1.HTMLCanvasElementLuminanceSource(canvas);
|
||
var hybridBinarizer = new library_1.HybridBinarizer(luminanceSource);
|
||
return new library_1.BinaryBitmap(hybridBinarizer);
|
||
};
|
||
/**
|
||
* Overwriting this allows you to manipulate the snapshot image in anyway you want before decode.
|
||
*/
|
||
BrowserCodeReader.drawImageOnCanvas = function (canvasElementContext, srcElement) {
|
||
canvasElementContext.drawImage(srcElement, 0, 0);
|
||
};
|
||
BrowserCodeReader.getMediaElementDimensions = function (mediaElement) {
|
||
if (mediaElement instanceof HTMLVideoElement) {
|
||
return {
|
||
height: mediaElement.videoHeight,
|
||
width: mediaElement.videoWidth,
|
||
};
|
||
}
|
||
if (mediaElement instanceof HTMLImageElement) {
|
||
return {
|
||
height: mediaElement.naturalHeight || mediaElement.height,
|
||
width: mediaElement.naturalWidth || mediaElement.width,
|
||
};
|
||
}
|
||
throw new Error('Couldn\'t find the Source\'s dimensions!');
|
||
};
|
||
/**
|
||
* 🖌 Prepares the canvas for capture and scan frames.
|
||
*/
|
||
BrowserCodeReader.createCaptureCanvas = function (mediaElement) {
|
||
if (!mediaElement) {
|
||
throw new library_1.ArgumentException('Cannot create a capture canvas without a media element.');
|
||
}
|
||
if (typeof document === 'undefined') {
|
||
throw new Error('The page "Document" is undefined, make sure you\'re running in a browser.');
|
||
}
|
||
var canvasElement = document.createElement('canvas');
|
||
var _a = BrowserCodeReader.getMediaElementDimensions(mediaElement), width = _a.width, height = _a.height;
|
||
canvasElement.style.width = width + 'px';
|
||
canvasElement.style.height = height + 'px';
|
||
canvasElement.width = width;
|
||
canvasElement.height = height;
|
||
return canvasElement;
|
||
};
|
||
/**
|
||
* Just tries to play the video and logs any errors.
|
||
* The play call is only made is the video is not already playing.
|
||
*/
|
||
BrowserCodeReader.tryPlayVideo = function (videoElement) {
|
||
return __awaiter(this, void 0, void 0, function () {
|
||
var error_1;
|
||
return __generator(this, function (_a) {
|
||
switch (_a.label) {
|
||
case 0:
|
||
if (videoElement === null || videoElement === void 0 ? void 0 : videoElement.ended) {
|
||
// tslint:disable-next-line:no-console
|
||
console.error('Trying to play video that has ended.');
|
||
return [2 /*return*/, false];
|
||
}
|
||
if (BrowserCodeReader.isVideoPlaying(videoElement)) {
|
||
// tslint:disable-next-line:no-console
|
||
console.warn('Trying to play video that is already playing.');
|
||
return [2 /*return*/, true];
|
||
}
|
||
_a.label = 1;
|
||
case 1:
|
||
_a.trys.push([1, 3, , 4]);
|
||
return [4 /*yield*/, videoElement.play()];
|
||
case 2:
|
||
_a.sent();
|
||
return [2 /*return*/, true];
|
||
case 3:
|
||
error_1 = _a.sent();
|
||
// tslint:disable-next-line:no-console
|
||
console.warn('It was not possible to play the video.', error_1);
|
||
return [2 /*return*/, false];
|
||
case 4: return [2 /*return*/];
|
||
}
|
||
});
|
||
});
|
||
};
|
||
/**
|
||
* Creates a canvas and draws the current image frame from the media element on it.
|
||
*
|
||
* @param mediaElement HTML media element to extract an image frame from.
|
||
*/
|
||
BrowserCodeReader.createCanvasFromMediaElement = function (mediaElement) {
|
||
var canvas = BrowserCodeReader.createCaptureCanvas(mediaElement);
|
||
var ctx = canvas.getContext('2d');
|
||
if (!ctx) {
|
||
throw new Error('Couldn\'t find Canvas 2D Context.');
|
||
}
|
||
BrowserCodeReader.drawImageOnCanvas(ctx, mediaElement);
|
||
return canvas;
|
||
};
|
||
/**
|
||
* Creates a binaryBitmap based in some image source.
|
||
*
|
||
* @param mediaElement HTML element containing drawable image source.
|
||
*/
|
||
BrowserCodeReader.createBinaryBitmapFromMediaElem = function (mediaElement) {
|
||
var canvas = BrowserCodeReader.createCanvasFromMediaElement(mediaElement);
|
||
return BrowserCodeReader.createBinaryBitmapFromCanvas(canvas);
|
||
};
|
||
BrowserCodeReader.destroyImageElement = function (imageElement) {
|
||
imageElement.src = '';
|
||
imageElement.removeAttribute('src');
|
||
imageElement = undefined;
|
||
};
|
||
/**
|
||
* Lists all the available video input devices.
|
||
*/
|
||
BrowserCodeReader.listVideoInputDevices = function () {
|
||
return __awaiter(this, void 0, void 0, function () {
|
||
var devices, videoDevices, devices_1, devices_1_1, device, kind, deviceId, label, groupId, videoDevice;
|
||
var e_2, _a;
|
||
return __generator(this, function (_b) {
|
||
switch (_b.label) {
|
||
case 0:
|
||
if (!(0, navigator_utils_1.hasNavigator)()) {
|
||
throw new Error('Can\'t enumerate devices, navigator is not present.');
|
||
}
|
||
if (!(0, navigator_utils_1.canEnumerateDevices)()) {
|
||
throw new Error('Can\'t enumerate devices, method not supported.');
|
||
}
|
||
return [4 /*yield*/, navigator.mediaDevices.enumerateDevices()];
|
||
case 1:
|
||
devices = _b.sent();
|
||
videoDevices = [];
|
||
try {
|
||
for (devices_1 = __values(devices), devices_1_1 = devices_1.next(); !devices_1_1.done; devices_1_1 = devices_1.next()) {
|
||
device = devices_1_1.value;
|
||
kind = device.kind === 'video' ? 'videoinput' : device.kind;
|
||
if (kind !== 'videoinput') {
|
||
continue;
|
||
}
|
||
deviceId = device.deviceId || device.id;
|
||
label = device.label || "Video device ".concat(videoDevices.length + 1);
|
||
groupId = device.groupId;
|
||
videoDevice = { deviceId: deviceId, label: label, kind: kind, groupId: groupId };
|
||
videoDevices.push(videoDevice);
|
||
}
|
||
}
|
||
catch (e_2_1) { e_2 = { error: e_2_1 }; }
|
||
finally {
|
||
try {
|
||
if (devices_1_1 && !devices_1_1.done && (_a = devices_1.return)) _a.call(devices_1);
|
||
}
|
||
finally { if (e_2) throw e_2.error; }
|
||
}
|
||
return [2 /*return*/, videoDevices];
|
||
}
|
||
});
|
||
});
|
||
};
|
||
/**
|
||
* Let's you find a device using it's Id.
|
||
*/
|
||
BrowserCodeReader.findDeviceById = function (deviceId) {
|
||
return __awaiter(this, void 0, void 0, function () {
|
||
var devices;
|
||
return __generator(this, function (_a) {
|
||
switch (_a.label) {
|
||
case 0: return [4 /*yield*/, BrowserCodeReader.listVideoInputDevices()];
|
||
case 1:
|
||
devices = _a.sent();
|
||
if (!devices) {
|
||
return [2 /*return*/];
|
||
}
|
||
return [2 /*return*/, devices.find(function (x) { return x.deviceId === deviceId; })];
|
||
}
|
||
});
|
||
});
|
||
};
|
||
/**
|
||
* Unbinds a HTML video src property.
|
||
*/
|
||
BrowserCodeReader.cleanVideoSource = function (videoElement) {
|
||
if (!videoElement) {
|
||
return;
|
||
}
|
||
// forgets about that element 😢
|
||
try {
|
||
videoElement.srcObject = null;
|
||
}
|
||
catch (err) {
|
||
videoElement.src = '';
|
||
}
|
||
if (videoElement) {
|
||
videoElement.removeAttribute('src');
|
||
}
|
||
};
|
||
/**
|
||
* Stops all media streams that are created.
|
||
*/
|
||
BrowserCodeReader.releaseAllStreams = function () {
|
||
if (BrowserCodeReader.streamTracker.length !== 0) {
|
||
// tslint:disable-next-line:no-console
|
||
BrowserCodeReader.streamTracker.forEach(function (mediaStream) {
|
||
mediaStream.getTracks().forEach(function (track) { return track.stop(); });
|
||
});
|
||
}
|
||
BrowserCodeReader.streamTracker = [];
|
||
};
|
||
/**
|
||
* Waits for a video to load and then hits play on it.
|
||
* To accomplish that, it binds listeners and callbacks to the video element.
|
||
*
|
||
* @param element The video element.
|
||
* @param callbackFn Callback invoked when the video is played.
|
||
*/
|
||
BrowserCodeReader.playVideoOnLoadAsync = function (element, timeout) {
|
||
return __awaiter(this, void 0, void 0, function () {
|
||
var isPlaying;
|
||
return __generator(this, function (_a) {
|
||
switch (_a.label) {
|
||
case 0: return [4 /*yield*/, BrowserCodeReader.tryPlayVideo(element)];
|
||
case 1:
|
||
isPlaying = _a.sent();
|
||
if (isPlaying) {
|
||
return [2 /*return*/, true];
|
||
}
|
||
return [2 /*return*/, new Promise(function (resolve, reject) {
|
||
// waits 3 seconds or rejects.
|
||
var timeoutId = setTimeout(function () {
|
||
if (BrowserCodeReader.isVideoPlaying(element)) {
|
||
// if video is playing then we had success, just ignore
|
||
return;
|
||
}
|
||
reject(false);
|
||
element.removeEventListener('canplay', videoCanPlayListener);
|
||
}, timeout);
|
||
/**
|
||
* Should contain the current registered listener for video loaded-metadata,
|
||
* used to unregister that listener when needed.
|
||
*/
|
||
var videoCanPlayListener = function () {
|
||
BrowserCodeReader.tryPlayVideo(element).then(function (hasPlayed) {
|
||
clearTimeout(timeoutId);
|
||
element.removeEventListener('canplay', videoCanPlayListener);
|
||
resolve(hasPlayed);
|
||
});
|
||
};
|
||
// both should be unregistered after called
|
||
element.addEventListener('canplay', videoCanPlayListener);
|
||
})];
|
||
}
|
||
});
|
||
});
|
||
};
|
||
/**
|
||
* Sets the new stream and request a new decoding-with-delay.
|
||
*
|
||
* @param stream The stream to be shown in the video element.
|
||
* @param decodeFn A callback for the decode method.
|
||
*/
|
||
BrowserCodeReader.attachStreamToVideo = function (stream, preview, previewPlayTimeout) {
|
||
if (previewPlayTimeout === void 0) { previewPlayTimeout = 5000; }
|
||
return __awaiter(this, void 0, void 0, function () {
|
||
var videoElement;
|
||
return __generator(this, function (_a) {
|
||
switch (_a.label) {
|
||
case 0:
|
||
videoElement = BrowserCodeReader.prepareVideoElement(preview);
|
||
BrowserCodeReader.addVideoSource(videoElement, stream);
|
||
return [4 /*yield*/, BrowserCodeReader.playVideoOnLoadAsync(videoElement, previewPlayTimeout)];
|
||
case 1:
|
||
_a.sent();
|
||
return [2 /*return*/, videoElement];
|
||
}
|
||
});
|
||
});
|
||
};
|
||
/**
|
||
* Returns a Promise that resolves when the given image element loads.
|
||
*/
|
||
BrowserCodeReader._waitImageLoad = function (element) {
|
||
return new Promise(function (resolve, reject) {
|
||
var timeout = 10000;
|
||
// waits 10 seconds or rejects.
|
||
var timeoutId = setTimeout(function () {
|
||
if (BrowserCodeReader.isImageLoaded(element)) {
|
||
// if video is playing then we had success, just ignore
|
||
return;
|
||
}
|
||
// removes the listener
|
||
element.removeEventListener('load', imageLoadedListener);
|
||
// rejects the load
|
||
reject();
|
||
}, timeout);
|
||
var imageLoadedListener = function () {
|
||
clearTimeout(timeoutId);
|
||
// removes the listener
|
||
element.removeEventListener('load', imageLoadedListener);
|
||
// resolves the load
|
||
resolve();
|
||
};
|
||
element.addEventListener('load', imageLoadedListener);
|
||
});
|
||
};
|
||
/**
|
||
* Checks if the `callbackFn` is defined, otherwise throws.
|
||
*/
|
||
BrowserCodeReader.checkCallbackFnOrThrow = function (callbackFn) {
|
||
if (!callbackFn) {
|
||
throw new library_1.ArgumentException('`callbackFn` is a required parameter, you cannot capture results without it.');
|
||
}
|
||
};
|
||
/**
|
||
* Standard method to dispose a media stream object.
|
||
*/
|
||
BrowserCodeReader.disposeMediaStream = function (stream) {
|
||
stream.getVideoTracks().forEach(function (x) { return x.stop(); });
|
||
stream = undefined;
|
||
};
|
||
/**
|
||
* Gets the BinaryBitmap for ya! (and decodes it)
|
||
*/
|
||
BrowserCodeReader.prototype.decode = function (element) {
|
||
// get binary bitmap for decode function
|
||
var canvas = BrowserCodeReader.createCanvasFromMediaElement(element);
|
||
return this.decodeFromCanvas(canvas);
|
||
};
|
||
/**
|
||
* Call the encapsulated readers decode
|
||
*/
|
||
BrowserCodeReader.prototype.decodeBitmap = function (binaryBitmap) {
|
||
return this.reader.decode(binaryBitmap, this.hints);
|
||
};
|
||
/**
|
||
* Decodes some barcode from a canvas!
|
||
*/
|
||
BrowserCodeReader.prototype.decodeFromCanvas = function (canvas) {
|
||
var binaryBitmap = BrowserCodeReader.createBinaryBitmapFromCanvas(canvas);
|
||
return this.decodeBitmap(binaryBitmap);
|
||
};
|
||
/**
|
||
* Decodes something from an image HTML element.
|
||
*/
|
||
BrowserCodeReader.prototype.decodeFromImageElement = function (source) {
|
||
return __awaiter(this, void 0, void 0, function () {
|
||
var element;
|
||
return __generator(this, function (_a) {
|
||
switch (_a.label) {
|
||
case 0:
|
||
if (!source) {
|
||
throw new library_1.ArgumentException('An image element must be provided.');
|
||
}
|
||
element = BrowserCodeReader.prepareImageElement(source);
|
||
return [4 /*yield*/, this._decodeOnLoadImage(element)];
|
||
case 1:
|
||
// onLoad will remove it's callback once done
|
||
// we do not need to dispose or destroy the image
|
||
// since it came from the user
|
||
return [2 /*return*/, _a.sent()];
|
||
}
|
||
});
|
||
});
|
||
};
|
||
/**
|
||
* Decodes an image from a URL.
|
||
*/
|
||
BrowserCodeReader.prototype.decodeFromImageUrl = function (url) {
|
||
return __awaiter(this, void 0, void 0, function () {
|
||
var element;
|
||
return __generator(this, function (_a) {
|
||
switch (_a.label) {
|
||
case 0:
|
||
if (!url) {
|
||
throw new library_1.ArgumentException('An URL must be provided.');
|
||
}
|
||
element = BrowserCodeReader.prepareImageElement();
|
||
// loads the image.
|
||
element.src = url;
|
||
_a.label = 1;
|
||
case 1:
|
||
_a.trys.push([1, , 3, 4]);
|
||
return [4 /*yield*/, this.decodeFromImageElement(element)];
|
||
case 2:
|
||
// it waits the task so we can destroy the created image after
|
||
return [2 /*return*/, _a.sent()];
|
||
case 3:
|
||
// we created this element, so we destroy it
|
||
BrowserCodeReader.destroyImageElement(element);
|
||
return [7 /*endfinally*/];
|
||
case 4: return [2 /*return*/];
|
||
}
|
||
});
|
||
});
|
||
};
|
||
/**
|
||
* Continuously tries to decode the barcode from a stream obtained from the given constraints
|
||
* while showing the video in the specified video element.
|
||
*
|
||
* @param {MediaStream} [constraints] the media stream constraints to get s valid media stream to decode from
|
||
* @param {string|HTMLVideoElement} [previewElem] the video element in page where to show the video while
|
||
* decoding. Can be either an element id or directly an HTMLVideoElement. Can be undefined, in
|
||
* which case no video will be shown.
|
||
*/
|
||
BrowserCodeReader.prototype.decodeFromConstraints = function (constraints, previewElem, callbackFn) {
|
||
return __awaiter(this, void 0, void 0, function () {
|
||
var stream, error_2;
|
||
return __generator(this, function (_a) {
|
||
switch (_a.label) {
|
||
case 0:
|
||
BrowserCodeReader.checkCallbackFnOrThrow(callbackFn);
|
||
return [4 /*yield*/, this.getUserMedia(constraints)];
|
||
case 1:
|
||
stream = _a.sent();
|
||
_a.label = 2;
|
||
case 2:
|
||
_a.trys.push([2, 4, , 5]);
|
||
return [4 /*yield*/, this.decodeFromStream(stream, previewElem, callbackFn)];
|
||
case 3: return [2 /*return*/, _a.sent()];
|
||
case 4:
|
||
error_2 = _a.sent();
|
||
BrowserCodeReader.disposeMediaStream(stream);
|
||
throw error_2;
|
||
case 5: return [2 /*return*/];
|
||
}
|
||
});
|
||
});
|
||
};
|
||
/**
|
||
* In one attempt, tries to decode the barcode from a stream obtained from the given constraints
|
||
* while showing the video in the specified video element.
|
||
*
|
||
* @param {MediaStream} [constraints] the media stream constraints to get s valid media stream to decode from
|
||
* @param {string|HTMLVideoElement} [preview] the video element in page where to show the video
|
||
* while decoding. Can be either an element id or directly an HTMLVideoElement. Can be undefined,
|
||
* in which case no video will be shown.
|
||
*/
|
||
BrowserCodeReader.prototype.decodeFromStream = function (stream, preview, callbackFn) {
|
||
return __awaiter(this, void 0, void 0, function () {
|
||
var timeout, video, finalizeCallback, originalControls, videoTracks, controls, isTorchAvailable, torchTrack_1, switchTorch_1;
|
||
var _this = this;
|
||
return __generator(this, function (_a) {
|
||
switch (_a.label) {
|
||
case 0:
|
||
BrowserCodeReader.checkCallbackFnOrThrow(callbackFn);
|
||
timeout = this.options.tryPlayVideoTimeout;
|
||
return [4 /*yield*/, BrowserCodeReader.attachStreamToVideo(stream, preview, timeout)];
|
||
case 1:
|
||
video = _a.sent();
|
||
finalizeCallback = function () {
|
||
// stops video tracks and releases the stream reference
|
||
BrowserCodeReader.disposeMediaStream(stream);
|
||
// this video was just a preview, so in order
|
||
// to release the stream we gotta stop showing
|
||
// it (the stream) in the video element
|
||
BrowserCodeReader.cleanVideoSource(video);
|
||
};
|
||
originalControls = this.scan(video, callbackFn, finalizeCallback);
|
||
videoTracks = stream.getVideoTracks();
|
||
controls = __assign(__assign({}, originalControls), { stop: function () {
|
||
originalControls.stop();
|
||
}, streamVideoConstraintsApply: function (constraints, trackFilter) {
|
||
return __awaiter(this, void 0, void 0, function () {
|
||
var tracks, tracks_2, tracks_2_1, track, e_3_1;
|
||
var e_3, _a;
|
||
return __generator(this, function (_b) {
|
||
switch (_b.label) {
|
||
case 0:
|
||
tracks = trackFilter ? videoTracks.filter(trackFilter) : videoTracks;
|
||
_b.label = 1;
|
||
case 1:
|
||
_b.trys.push([1, 6, 7, 8]);
|
||
tracks_2 = __values(tracks), tracks_2_1 = tracks_2.next();
|
||
_b.label = 2;
|
||
case 2:
|
||
if (!!tracks_2_1.done) return [3 /*break*/, 5];
|
||
track = tracks_2_1.value;
|
||
return [4 /*yield*/, track.applyConstraints(constraints)];
|
||
case 3:
|
||
_b.sent();
|
||
_b.label = 4;
|
||
case 4:
|
||
tracks_2_1 = tracks_2.next();
|
||
return [3 /*break*/, 2];
|
||
case 5: return [3 /*break*/, 8];
|
||
case 6:
|
||
e_3_1 = _b.sent();
|
||
e_3 = { error: e_3_1 };
|
||
return [3 /*break*/, 8];
|
||
case 7:
|
||
try {
|
||
if (tracks_2_1 && !tracks_2_1.done && (_a = tracks_2.return)) _a.call(tracks_2);
|
||
}
|
||
finally { if (e_3) throw e_3.error; }
|
||
return [7 /*endfinally*/];
|
||
case 8: return [2 /*return*/];
|
||
}
|
||
});
|
||
});
|
||
}, streamVideoConstraintsGet: function (trackFilter) {
|
||
return videoTracks.find(trackFilter).getConstraints();
|
||
}, streamVideoSettingsGet: function (trackFilter) {
|
||
return videoTracks.find(trackFilter).getSettings();
|
||
}, streamVideoCapabilitiesGet: function (trackFilter) {
|
||
return videoTracks.find(trackFilter).getCapabilities();
|
||
} });
|
||
isTorchAvailable = BrowserCodeReader.mediaStreamIsTorchCompatible(stream);
|
||
if (isTorchAvailable) {
|
||
torchTrack_1 = videoTracks === null || videoTracks === void 0 ? void 0 : videoTracks.find(function (t) { return BrowserCodeReader.mediaStreamIsTorchCompatibleTrack(t); });
|
||
switchTorch_1 = function (onOff) { return __awaiter(_this, void 0, void 0, function () {
|
||
return __generator(this, function (_a) {
|
||
switch (_a.label) {
|
||
case 0: return [4 /*yield*/, BrowserCodeReader.mediaStreamSetTorch(torchTrack_1, onOff)];
|
||
case 1:
|
||
_a.sent();
|
||
return [2 /*return*/];
|
||
}
|
||
});
|
||
}); };
|
||
controls.switchTorch = switchTorch_1;
|
||
controls.stop = function () { return __awaiter(_this, void 0, void 0, function () {
|
||
return __generator(this, function (_a) {
|
||
switch (_a.label) {
|
||
case 0:
|
||
originalControls.stop();
|
||
return [4 /*yield*/, switchTorch_1(false)];
|
||
case 1:
|
||
_a.sent();
|
||
return [2 /*return*/];
|
||
}
|
||
});
|
||
}); };
|
||
}
|
||
return [2 /*return*/, controls];
|
||
}
|
||
});
|
||
});
|
||
};
|
||
/**
|
||
* Continuously tries to decode the barcode from the device specified by device while showing
|
||
* the video in the specified video element.
|
||
*
|
||
* @param {string|null} [deviceId] the id of one of the devices obtained after calling
|
||
* getVideoInputDevices. Can be undefined, in this case it will decode from one of the
|
||
* available devices, preferring the main camera (environment facing) if available.
|
||
* @param {string|HTMLVideoElement|null} [video] the video element in page where to show the video
|
||
* while decoding. Can be either an element id or directly an HTMLVideoElement. Can be undefined,
|
||
* in which case no video will be shown.
|
||
*/
|
||
BrowserCodeReader.prototype.decodeFromVideoDevice = function (deviceId, previewElem, callbackFn) {
|
||
return __awaiter(this, void 0, void 0, function () {
|
||
var videoConstraints, constraints;
|
||
return __generator(this, function (_a) {
|
||
switch (_a.label) {
|
||
case 0:
|
||
BrowserCodeReader.checkCallbackFnOrThrow(callbackFn);
|
||
if (!deviceId) {
|
||
videoConstraints = { facingMode: 'environment' };
|
||
}
|
||
else {
|
||
videoConstraints = { deviceId: { exact: deviceId } };
|
||
}
|
||
constraints = { video: videoConstraints };
|
||
return [4 /*yield*/, this.decodeFromConstraints(constraints, previewElem, callbackFn)];
|
||
case 1: return [2 /*return*/, _a.sent()];
|
||
}
|
||
});
|
||
});
|
||
};
|
||
/**
|
||
* Decodes something from an image HTML element.
|
||
*/
|
||
BrowserCodeReader.prototype.decodeFromVideoElement = function (source, callbackFn) {
|
||
return __awaiter(this, void 0, void 0, function () {
|
||
var element, timeout;
|
||
return __generator(this, function (_a) {
|
||
switch (_a.label) {
|
||
case 0:
|
||
BrowserCodeReader.checkCallbackFnOrThrow(callbackFn);
|
||
if (!source) {
|
||
throw new library_1.ArgumentException('A video element must be provided.');
|
||
}
|
||
element = BrowserCodeReader.prepareVideoElement(source);
|
||
timeout = this.options.tryPlayVideoTimeout;
|
||
// plays the video
|
||
return [4 /*yield*/, BrowserCodeReader.playVideoOnLoadAsync(element, timeout)];
|
||
case 1:
|
||
// plays the video
|
||
_a.sent();
|
||
// starts decoding after played the video
|
||
return [2 /*return*/, this.scan(element, callbackFn)];
|
||
}
|
||
});
|
||
});
|
||
};
|
||
/**
|
||
* Decodes a video from a URL until it ends.
|
||
*/
|
||
BrowserCodeReader.prototype.decodeFromVideoUrl = function (url, callbackFn) {
|
||
return __awaiter(this, void 0, void 0, function () {
|
||
var element, finalizeCallback, timeout, controls;
|
||
return __generator(this, function (_a) {
|
||
switch (_a.label) {
|
||
case 0:
|
||
BrowserCodeReader.checkCallbackFnOrThrow(callbackFn);
|
||
if (!url) {
|
||
throw new library_1.ArgumentException('An URL must be provided.');
|
||
}
|
||
element = BrowserCodeReader.prepareVideoElement();
|
||
// starts loading the video
|
||
element.src = url;
|
||
finalizeCallback = function () {
|
||
// dispose created video element
|
||
BrowserCodeReader.cleanVideoSource(element);
|
||
};
|
||
timeout = this.options.tryPlayVideoTimeout;
|
||
// plays the video
|
||
return [4 /*yield*/, BrowserCodeReader.playVideoOnLoadAsync(element, timeout)];
|
||
case 1:
|
||
// plays the video
|
||
_a.sent();
|
||
controls = this.scan(element, callbackFn, finalizeCallback);
|
||
return [2 /*return*/, controls];
|
||
}
|
||
});
|
||
});
|
||
};
|
||
/**
|
||
* In one attempt, tries to decode the barcode from a stream obtained from the given
|
||
* constraints while showing the video in the specified video element.
|
||
*
|
||
* @param constraints the media stream constraints to get s valid media stream to decode from
|
||
* @param videoSource the video element in page where to show the video while decoding.
|
||
* Can be either an element id or directly an HTMLVideoElement. Can be undefined,
|
||
* in which case no video will be shown.
|
||
* The decoding result.
|
||
*/
|
||
BrowserCodeReader.prototype.decodeOnceFromConstraints = function (constraints, videoSource) {
|
||
return __awaiter(this, void 0, void 0, function () {
|
||
var stream;
|
||
return __generator(this, function (_a) {
|
||
switch (_a.label) {
|
||
case 0: return [4 /*yield*/, this.getUserMedia(constraints)];
|
||
case 1:
|
||
stream = _a.sent();
|
||
return [4 /*yield*/, this.decodeOnceFromStream(stream, videoSource)];
|
||
case 2: return [2 /*return*/, _a.sent()];
|
||
}
|
||
});
|
||
});
|
||
};
|
||
/**
|
||
* In one attempt, tries to decode the barcode from a stream obtained from the given
|
||
* constraints while showing the video in the specified video element.
|
||
*
|
||
* @param {MediaStream} [constraints] the media stream constraints to get s valid media stream to decode from
|
||
* @param {string|HTMLVideoElement} [video] the video element in page where to show the video while decoding.
|
||
* Can be either an element id or directly an HTMLVideoElement. Can be undefined,
|
||
* in which case no video will be shown.
|
||
*/
|
||
BrowserCodeReader.prototype.decodeOnceFromStream = function (stream, preview) {
|
||
return __awaiter(this, void 0, void 0, function () {
|
||
var receivedPreview, video, result;
|
||
return __generator(this, function (_a) {
|
||
switch (_a.label) {
|
||
case 0:
|
||
receivedPreview = Boolean(preview);
|
||
return [4 /*yield*/, BrowserCodeReader.attachStreamToVideo(stream, preview)];
|
||
case 1:
|
||
video = _a.sent();
|
||
_a.label = 2;
|
||
case 2:
|
||
_a.trys.push([2, , 4, 5]);
|
||
return [4 /*yield*/, this.scanOneResult(video)];
|
||
case 3:
|
||
result = _a.sent();
|
||
return [2 /*return*/, result];
|
||
case 4:
|
||
if (!receivedPreview) {
|
||
BrowserCodeReader.cleanVideoSource(video);
|
||
}
|
||
return [7 /*endfinally*/];
|
||
case 5: return [2 /*return*/];
|
||
}
|
||
});
|
||
});
|
||
};
|
||
/**
|
||
* In one attempt, tries to decode the barcode from the device specified by deviceId
|
||
* while showing the video in the specified video element.
|
||
*
|
||
* @param deviceId the id of one of the devices obtained after calling getVideoInputDevices.
|
||
* Can be undefined, in this case it will decode from one of the available devices,
|
||
* preferring the main camera (environment facing) if available.
|
||
* @param videoSource the video element in page where to show the video while decoding.
|
||
* Can be either an element id or directly an HTMLVideoElement. Can be undefined,
|
||
* in which case no video will be shown.
|
||
*/
|
||
BrowserCodeReader.prototype.decodeOnceFromVideoDevice = function (deviceId, videoSource) {
|
||
return __awaiter(this, void 0, void 0, function () {
|
||
var videoConstraints, constraints;
|
||
return __generator(this, function (_a) {
|
||
switch (_a.label) {
|
||
case 0:
|
||
if (!deviceId) {
|
||
videoConstraints = { facingMode: 'environment' };
|
||
}
|
||
else {
|
||
videoConstraints = { deviceId: { exact: deviceId } };
|
||
}
|
||
constraints = { video: videoConstraints };
|
||
return [4 /*yield*/, this.decodeOnceFromConstraints(constraints, videoSource)];
|
||
case 1: return [2 /*return*/, _a.sent()];
|
||
}
|
||
});
|
||
});
|
||
};
|
||
/**
|
||
* Decodes something from an image HTML element.
|
||
*/
|
||
BrowserCodeReader.prototype.decodeOnceFromVideoElement = function (source) {
|
||
return __awaiter(this, void 0, void 0, function () {
|
||
var element, timeout;
|
||
return __generator(this, function (_a) {
|
||
switch (_a.label) {
|
||
case 0:
|
||
if (!source) {
|
||
throw new library_1.ArgumentException('A video element must be provided.');
|
||
}
|
||
element = BrowserCodeReader.prepareVideoElement(source);
|
||
timeout = this.options.tryPlayVideoTimeout;
|
||
// plays the video
|
||
return [4 /*yield*/, BrowserCodeReader.playVideoOnLoadAsync(element, timeout)];
|
||
case 1:
|
||
// plays the video
|
||
_a.sent();
|
||
return [4 /*yield*/, this.scanOneResult(element)];
|
||
case 2:
|
||
// starts decoding after played the video
|
||
return [2 /*return*/, _a.sent()];
|
||
}
|
||
});
|
||
});
|
||
};
|
||
/**
|
||
* Decodes a video from a URL.
|
||
*/
|
||
BrowserCodeReader.prototype.decodeOnceFromVideoUrl = function (url) {
|
||
return __awaiter(this, void 0, void 0, function () {
|
||
var element, task;
|
||
return __generator(this, function (_a) {
|
||
switch (_a.label) {
|
||
case 0:
|
||
if (!url) {
|
||
throw new library_1.ArgumentException('An URL must be provided.');
|
||
}
|
||
element = BrowserCodeReader.prepareVideoElement();
|
||
// starts loading the video
|
||
element.src = url;
|
||
task = this.decodeOnceFromVideoElement(element);
|
||
_a.label = 1;
|
||
case 1:
|
||
_a.trys.push([1, , 3, 4]);
|
||
return [4 /*yield*/, task];
|
||
case 2:
|
||
// it waits the task so we can destroy the created image after
|
||
return [2 /*return*/, _a.sent()];
|
||
case 3:
|
||
// we created this element, so we destroy it
|
||
BrowserCodeReader.cleanVideoSource(element);
|
||
return [7 /*endfinally*/];
|
||
case 4: return [2 /*return*/];
|
||
}
|
||
});
|
||
});
|
||
};
|
||
/**
|
||
* Tries to decode from the video input until it finds some value.
|
||
*/
|
||
BrowserCodeReader.prototype.scanOneResult = function (element, retryIfNotFound, retryIfChecksumError, retryIfFormatError) {
|
||
var _this = this;
|
||
if (retryIfNotFound === void 0) { retryIfNotFound = true; }
|
||
if (retryIfChecksumError === void 0) { retryIfChecksumError = true; }
|
||
if (retryIfFormatError === void 0) { retryIfFormatError = true; }
|
||
return new Promise(function (resolve, reject) {
|
||
// reuses the scan API, but returns at the first successful result
|
||
_this.scan(element, function (result, error, controls) {
|
||
if (result) {
|
||
// good result, returning
|
||
resolve(result);
|
||
controls.stop();
|
||
return;
|
||
}
|
||
if (error) {
|
||
// checks if it should retry
|
||
if (error instanceof library_1.NotFoundException && retryIfNotFound) {
|
||
return;
|
||
}
|
||
if (error instanceof library_1.ChecksumException && retryIfChecksumError) {
|
||
return;
|
||
}
|
||
if (error instanceof library_1.FormatException && retryIfFormatError) {
|
||
return;
|
||
}
|
||
// not re-trying
|
||
controls.stop(); // stops scan loop
|
||
reject(error); // returns the error
|
||
}
|
||
});
|
||
});
|
||
};
|
||
/**
|
||
* Continuously decodes from video input.
|
||
*
|
||
* @param element HTML element to scan/decode from. It will not be disposed or destroyed.
|
||
* @param callbackFn Called after every scan attempt, being it successful or errored.
|
||
* @param finalizeCallback Called after scan process reaches the end or stop is called.
|
||
*/
|
||
BrowserCodeReader.prototype.scan = function (element, callbackFn, finalizeCallback) {
|
||
var _this = this;
|
||
BrowserCodeReader.checkCallbackFnOrThrow(callbackFn);
|
||
/**
|
||
* The HTML canvas element, used to draw the video or image's frame for decoding.
|
||
*/
|
||
var captureCanvas = BrowserCodeReader.createCaptureCanvas(element);
|
||
/**
|
||
* The HTML canvas element context.
|
||
*/
|
||
var captureCanvasContext;
|
||
try {
|
||
captureCanvasContext = captureCanvas.getContext('2d', { willReadFrequently: true });
|
||
}
|
||
catch (e) {
|
||
captureCanvasContext = captureCanvas.getContext('2d');
|
||
}
|
||
// cannot proceed w/o this
|
||
if (!captureCanvasContext) {
|
||
throw new Error('Couldn\'t create canvas for visual element scan.');
|
||
}
|
||
var disposeCanvas = function () {
|
||
captureCanvasContext = undefined;
|
||
captureCanvas = undefined;
|
||
};
|
||
var stopScan = false;
|
||
var lastTimeoutId;
|
||
// can be called to break the scan loop
|
||
var stop = function () {
|
||
stopScan = true;
|
||
clearTimeout(lastTimeoutId);
|
||
disposeCanvas();
|
||
if (finalizeCallback) {
|
||
finalizeCallback();
|
||
}
|
||
};
|
||
// created for extensibility
|
||
var controls = { stop: stop };
|
||
// this async loop allows infinite (or almost? maybe) scans
|
||
var loop = function () {
|
||
if (stopScan) {
|
||
// no need to clear timeouts as none was create yet in this scope.
|
||
return;
|
||
}
|
||
try {
|
||
BrowserCodeReader.drawImageOnCanvas(captureCanvasContext, element);
|
||
var result = _this.decodeFromCanvas(captureCanvas);
|
||
callbackFn(result, undefined, controls);
|
||
lastTimeoutId = setTimeout(loop, _this.options.delayBetweenScanSuccess);
|
||
}
|
||
catch (error) {
|
||
callbackFn(undefined, error, controls);
|
||
var isChecksumError = error instanceof library_1.ChecksumException;
|
||
var isFormatError = error instanceof library_1.FormatException;
|
||
var isNotFound = error instanceof library_1.NotFoundException;
|
||
if (isChecksumError || isFormatError || isNotFound) {
|
||
// trying again
|
||
lastTimeoutId = setTimeout(loop, _this.options.delayBetweenScanAttempts);
|
||
return;
|
||
}
|
||
// not trying again
|
||
disposeCanvas();
|
||
if (finalizeCallback) {
|
||
finalizeCallback(error);
|
||
}
|
||
}
|
||
};
|
||
// starts the async loop
|
||
loop();
|
||
return controls;
|
||
};
|
||
/**
|
||
* Waits for the image to load and then tries to decode it.
|
||
*/
|
||
BrowserCodeReader.prototype._decodeOnLoadImage = function (element) {
|
||
return __awaiter(this, void 0, void 0, function () {
|
||
var isImageLoaded;
|
||
return __generator(this, function (_a) {
|
||
switch (_a.label) {
|
||
case 0:
|
||
isImageLoaded = BrowserCodeReader.isImageLoaded(element);
|
||
if (!!isImageLoaded) return [3 /*break*/, 2];
|
||
return [4 /*yield*/, BrowserCodeReader._waitImageLoad(element)];
|
||
case 1:
|
||
_a.sent();
|
||
_a.label = 2;
|
||
case 2: return [2 /*return*/, this.decode(element)];
|
||
}
|
||
});
|
||
});
|
||
};
|
||
/**
|
||
* Get MediaStream from browser to be used.
|
||
* @param constraints constraints the media stream constraints to get s valid media stream to decode from.
|
||
* @private For private use.
|
||
*/
|
||
BrowserCodeReader.prototype.getUserMedia = function (constraints) {
|
||
return __awaiter(this, void 0, void 0, function () {
|
||
var stream;
|
||
return __generator(this, function (_a) {
|
||
switch (_a.label) {
|
||
case 0: return [4 /*yield*/, navigator.mediaDevices.getUserMedia(constraints)];
|
||
case 1:
|
||
stream = _a.sent();
|
||
BrowserCodeReader.streamTracker.push(stream);
|
||
return [2 /*return*/, stream];
|
||
}
|
||
});
|
||
});
|
||
};
|
||
/**
|
||
* Keeps track to created media streams.
|
||
* @private there is no need this array to be accessible from outside.
|
||
*/
|
||
BrowserCodeReader.streamTracker = [];
|
||
return BrowserCodeReader;
|
||
}());
|
||
exports.BrowserCodeReader = BrowserCodeReader;
|
||
//# sourceMappingURL=BrowserCodeReader.js.map
|