@zxing/browser
Version:
ZXing for JS's browser layer.
1,050 lines • 56 kB
JavaScript
var __assign = (this && this.__assign) || function () {
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var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
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function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
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throw new TypeError(s ? "Object is not iterable." : "Symbol.iterator is not defined.");
};
import { ArgumentException, BinaryBitmap, ChecksumException, DecodeHintType, FormatException, HybridBinarizer, NotFoundException, } from '@zxing/library';
import { HTMLCanvasElementLuminanceSource } from '../common/HTMLCanvasElementLuminanceSource';
import { canEnumerateDevices, hasNavigator } from '../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(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 ArgumentException("element with id '".concat(mediaElementId, "' not found"));
}
if (mediaElement.nodeName.toLowerCase() !== type.toLowerCase()) {
throw new 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(canvas);
var hybridBinarizer = new HybridBinarizer(luminanceSource);
return new 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 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 (!hasNavigator()) {
throw new Error('Can\'t enumerate devices, navigator is not present.');
}
if (!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 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 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 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 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 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 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 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