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MetadataLoader.ts
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MetadataLoader.ts
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import * as fs from 'fs';
import { imageSize } from 'image-size';
import { Config } from '../../../common/config/private/Config';
import { FaceRegion, PhotoMetadata } from '../../../common/entities/PhotoDTO';
import { VideoMetadata } from '../../../common/entities/VideoDTO';
import { RatingTypes } from '../../../common/entities/MediaDTO';
import { Logger } from '../../Logger';
// eslint-disable-next-line @typescript-eslint/ban-ts-comment
// @ts-ignore
import * as exifr from 'exifr';
import { FfprobeData } from 'fluent-ffmpeg';
import { FileHandle } from 'fs/promises';
import * as util from 'node:util';
import * as path from 'path';
import { Utils } from '../../../common/Utils';
import { FFmpegFactory } from '../FFmpegFactory';
import { ExtensionDecorator } from '../extension/ExtensionDecorator';
import { DateTags } from './MetadataCreationDate';
const LOG_TAG = '[MetadataLoader]';
const ffmpeg = FFmpegFactory.get();
export class MetadataLoader {
@ExtensionDecorator(e => e.gallery.MetadataLoader.loadVideoMetadata)
public static async loadVideoMetadata(fullPath: string): Promise<VideoMetadata> {
const metadata: VideoMetadata = {
size: {
width: 1,
height: 1,
},
bitRate: 0,
duration: 0,
creationDate: 0,
fileSize: 0,
fps: 0,
};
try {
const stat = fs.statSync(fullPath);
metadata.fileSize = stat.size;
metadata.creationDate = stat.mtime.getTime(); //Default date is file system time of last modification
} catch (err) {
console.log(err);
// ignoring errors
}
try {
const data: FfprobeData = await util.promisify<FfprobeData>(
// wrap to arrow function otherwise 'this' is lost for ffprobe
(cb) => ffmpeg(fullPath).ffprobe(cb)
)();
try {
for (const stream of data.streams) {
if (stream.width) {
metadata.size.width = stream.width;
metadata.size.height = stream.height;
if (
Utils.isInt32(parseInt('' + stream.rotation, 10)) &&
(Math.abs(parseInt('' + stream.rotation, 10)) / 90) % 2 === 1
) {
// noinspection JSSuspiciousNameCombination
metadata.size.width = stream.height;
// noinspection JSSuspiciousNameCombination
metadata.size.height = stream.width;
}
if (
Utils.isInt32(Math.floor(parseFloat(stream.duration) * 1000))
) {
metadata.duration = Math.floor(
parseFloat(stream.duration) * 1000
);
}
if (Utils.isInt32(parseInt(stream.bit_rate, 10))) {
metadata.bitRate = parseInt(stream.bit_rate, 10) || null;
}
if (Utils.isInt32(parseInt(stream.avg_frame_rate, 10))) {
metadata.fps = parseInt(stream.avg_frame_rate, 10) || null;
}
if (
stream.tags !== undefined &&
typeof stream.tags.creation_time === 'string'
) {
metadata.creationDate =
Date.parse(stream.tags.creation_time) ||
metadata.creationDate;
}
break;
}
}
// For some filetypes (for instance Matroska), bitrate and duration are stored in
// the format section, not in the stream section.
// Only use duration from container header if necessary (stream duration is usually more accurate)
if (
metadata.duration === 0 &&
data.format.duration !== undefined &&
Utils.isInt32(Math.floor(data.format.duration * 1000))
) {
metadata.duration = Math.floor(data.format.duration * 1000);
}
// Prefer bitrate from container header (includes video and audio)
if (
data.format.bit_rate !== undefined &&
Utils.isInt32(data.format.bit_rate)
) {
metadata.bitRate = data.format.bit_rate;
}
if (
data.format.tags !== undefined &&
typeof data.format.tags.creation_time === 'string'
) {
metadata.creationDate =
Date.parse(data.format.tags.creation_time) ||
metadata.creationDate;
}
// eslint-disable-next-line no-empty
} catch (err) {
Logger.silly(LOG_TAG, 'Error loading metadata for : ' + fullPath);
Logger.silly(err);
}
metadata.creationDate = metadata.creationDate || 0;
try {
// search for sidecar and merge metadata
const fullPathWithoutExt = path.join(path.parse(fullPath).dir, path.parse(fullPath).name);
const sidecarPaths = [
fullPath + '.xmp',
fullPath + '.XMP',
fullPathWithoutExt + '.xmp',
fullPathWithoutExt + '.XMP',
];
for (const sidecarPath of sidecarPaths) {
if (fs.existsSync(sidecarPath)) {
const sidecarData: any = await exifr.sidecar(sidecarPath);
if (sidecarData !== undefined) {
MetadataLoader.mapMetadata(metadata, sidecarData);
}
}
}
} catch (err) {
Logger.silly(LOG_TAG, 'Error loading sidecar metadata for : ' + fullPath);
Logger.silly(err);
}
} catch (err) {
Logger.silly(LOG_TAG, 'Error loading metadata for : ' + fullPath);
Logger.silly(err);
}
return metadata;
}
private static readonly EMPTY_METADATA: PhotoMetadata = {
size: { width: 0, height: 0 },
creationDate: 0,
fileSize: 0,
};
@ExtensionDecorator(e => e.gallery.MetadataLoader.loadPhotoMetadata)
public static async loadPhotoMetadata(fullPath: string): Promise<PhotoMetadata> {
let fileHandle: FileHandle;
const metadata: PhotoMetadata = {
size: { width: 0, height: 0 },
creationDate: 0,
fileSize: 0,
};
const exifrOptions = {
tiff: true,
xmp: true,
icc: false,
jfif: false, //not needed and not supported for png
ihdr: true,
iptc: true,
exif: true,
gps: true,
reviveValues: false, //don't convert timestamps
translateValues: false, //don't translate orientation from numbers to strings etc.
mergeOutput: false //don't merge output, because things like Microsoft Rating (percent) and xmp.rating will be merged
};
try {
let bufferSize = Config.Media.photoMetadataSize;
try {
const stat = fs.statSync(fullPath);
metadata.fileSize = stat.size;
//No reason to make the buffer larger than the actual file
bufferSize = Math.min(Config.Media.photoMetadataSize, metadata.fileSize);
metadata.creationDate = stat.mtime.getTime();
} catch (err) {
// ignoring errors
}
try {
//read the actual image size, don't rely on tags for this
const info = imageSize(fullPath);
metadata.size = { width: info.width, height: info.height };
} catch (e) {
//in case of failure, set dimensions to 0 so they may be read via tags
metadata.size = { width: 0, height: 0 };
} finally {
if (isNaN(metadata.size.width) || metadata.size.width == null) {
metadata.size.width = 0;
}
if (isNaN(metadata.size.height) || metadata.size.height == null) {
metadata.size.height = 0;
}
}
const data = Buffer.allocUnsafe(bufferSize);
fileHandle = await fs.promises.open(fullPath, 'r');
try {
await fileHandle.read(data, 0, bufferSize, 0);
} catch (err) {
Logger.error(LOG_TAG, 'Error during reading photo: ' + fullPath);
console.error(err);
return MetadataLoader.EMPTY_METADATA;
} finally {
await fileHandle.close();
}
try {
try {
const exif = await exifr.parse(data, exifrOptions);
MetadataLoader.mapMetadata(metadata, exif);
} catch (err) {
// ignoring errors
}
try {
// search for sidecar and merge metadata
const fullPathWithoutExt = path.join(path.parse(fullPath).dir, path.parse(fullPath).name);
const sidecarPaths = [
fullPath + '.xmp',
fullPath + '.XMP',
fullPathWithoutExt + '.xmp',
fullPathWithoutExt + '.XMP',
];
for (const sidecarPath of sidecarPaths) {
if (fs.existsSync(sidecarPath)) {
const sidecarData: any = await exifr.sidecar(sidecarPath, exifrOptions);
if (sidecarData !== undefined) {
//note that since side cars are loaded last, data loaded here overwrites embedded metadata (in Pigallery2, not in the actual files)
MetadataLoader.mapMetadata(metadata, sidecarData);
break;
}
}
}
} catch (err) {
Logger.silly(LOG_TAG, 'Error loading sidecar metadata for : ' + fullPath);
Logger.silly(err);
}
if (!metadata.creationDate) {
// creationDate can be negative, when it was created before epoch (1970)
metadata.creationDate = 0;
}
} catch (err) {
Logger.error(LOG_TAG, 'Error during reading photo: ' + fullPath);
console.error(err);
return MetadataLoader.EMPTY_METADATA;
}
} catch (err) {
Logger.error(LOG_TAG, 'Error during reading photo: ' + fullPath);
console.error(err);
return MetadataLoader.EMPTY_METADATA;
}
return metadata;
}
private static mapMetadata(metadata: PhotoMetadata, exif: any) {
//replace adobe xap-section with xmp to reuse parsing
if (Object.hasOwn(exif, 'xap')) {
exif['xmp'] = exif['xap'];
delete exif['xap'];
}
const orientation = MetadataLoader.getOrientation(exif);
MetadataLoader.mapImageDimensions(metadata, exif, orientation);
MetadataLoader.mapKeywords(metadata, exif);
MetadataLoader.mapTitle(metadata, exif);
MetadataLoader.mapCaption(metadata, exif);
MetadataLoader.mapTimestampAndOffset(metadata, exif);
MetadataLoader.mapCameraData(metadata, exif);
MetadataLoader.mapGPS(metadata, exif);
MetadataLoader.mapToponyms(metadata, exif);
MetadataLoader.mapRating(metadata, exif);
if (Config.Faces.enabled) {
MetadataLoader.mapFaces(metadata, exif, orientation);
}
}
private static getOrientation(exif: any): number {
let orientation = 1; //Orientation 1 is normal
if (exif.ifd0?.Orientation != undefined) {
orientation = parseInt(exif.ifd0.Orientation as any, 10) as number;
}
return orientation;
}
private static mapImageDimensions(metadata: PhotoMetadata, exif: any, orientation: number) {
if (metadata.size.width <= 0) {
metadata.size.width = exif.ifd0?.ImageWidth || exif.exif?.ExifImageWidth || metadata.size.width;
}
if (metadata.size.height <= 0) {
metadata.size.height = exif.ifd0?.ImageHeight || exif.exif?.ExifImageHeight || metadata.size.height;
}
metadata.size.height = Math.max(metadata.size.height, 1); //ensure height dimension is positive
metadata.size.width = Math.max(metadata.size.width, 1); //ensure width dimension is positive
//we need to switch width and height for images that are rotated sideways
if (4 < orientation) { //Orientation is sideways (rotated 90% or 270%)
// noinspection JSSuspiciousNameCombination
const height = metadata.size.width;
// noinspection JSSuspiciousNameCombination
metadata.size.width = metadata.size.height;
metadata.size.height = height;
}
}
private static mapKeywords(metadata: PhotoMetadata, exif: any) {
if (exif.dc &&
exif.dc.subject &&
exif.dc.subject.length > 0) {
const subj = Array.isArray(exif.dc.subject) ? exif.dc.subject : [exif.dc.subject];
if (metadata.keywords === undefined) {
metadata.keywords = [];
}
for (const kw of subj) {
if (metadata.keywords.indexOf(kw) === -1) {
metadata.keywords.push(kw);
}
}
}
if (exif.iptc &&
exif.iptc.Keywords &&
exif.iptc.Keywords.length > 0) {
const subj = Array.isArray(exif.iptc.Keywords) ? exif.iptc.Keywords : [exif.iptc.Keywords];
if (metadata.keywords === undefined) {
metadata.keywords = [];
}
for (let kw of subj) {
kw = Utils.asciiToUTF8(kw);
if (metadata.keywords.indexOf(kw) === -1) {
metadata.keywords.push(kw);
}
}
}
}
private static mapTitle(metadata: PhotoMetadata, exif: any) {
metadata.title = exif.dc?.title?.value || Utils.asciiToUTF8(exif.iptc?.ObjectName) || metadata.title || exif.photoshop?.Headline || exif.acdsee?.caption; //acdsee caption holds the title when data is saved by digikam. Used as last resort if iptc and dc do not contain the data
}
private static mapCaption(metadata: PhotoMetadata, exif: any) {
metadata.caption = exif.dc?.description?.value || Utils.asciiToUTF8(exif.iptc?.Caption) || metadata.caption || exif.ifd0?.ImageDescription || exif.exif?.UserComment?.value || exif.Iptc4xmpCore?.ExtDescrAccessibility?.value ||exif.acdsee?.notes;
}
private static mapTimestampAndOffset(metadata: PhotoMetadata, exif: any) {
//This method looks for date tags matching the priorized list 'DateTags' of 'MetadataCreationDate'
let ts: string, offset: string;
for (let i = 0; i < DateTags.length; i++) {
const [mainpath, extrapath, extratype] = DateTags[i];
[ts, offset] = extractTSAndOffset(mainpath, extrapath, extratype);
if (ts) {
if (!offset) { //We don't have the offset from the timestamp or from extra tag, let's see if we can find it in another way
//Check the explicit offset tags. Otherwise calculate from GPS
offset = exif.exif?.OffsetTimeOriginal || exif.exif?.OffsetTimeDigitized || exif.exif?.OffsetTime || Utils.getTimeOffsetByGPSStamp(ts, exif.exif?.GPSTimeStamp, exif.gps);
}
if (!offset) { //still no offset? let's look for a timestamp with offset in the rest of the DateTags list
const [tsonly, tsoffset] = Utils.splitTimestampAndOffset(ts);
for (let j = i+1; j < DateTags.length; j++) {
const [exts, exOffset] = extractTSAndOffset(DateTags[j][0], DateTags[j][1], DateTags[j][2]);
if (exts && exOffset && Math.abs(Utils.timestampToMS(tsonly, null) - Utils.timestampToMS(exts, null)) < 30000) {
//if there is an offset and the found timestamp is within 30 seconds of the extra timestamp, we will use the offset from the found timestamp
offset = exOffset;
break;
}
}
}
break; //timestamp is found, look no further
}
}
metadata.creationDate = Utils.timestampToMS(ts, offset) || metadata.creationDate;
metadata.creationDateOffset = offset || metadata.creationDateOffset;
//---- End of mapTimestampAndOffset logic ----
//---- Helper functions for mapTimestampAndOffset ----
function getValue(exif: any, path: string): any {
const pathElements = path.split('.');
let currentObject: any = exif;
for (const pathElm of pathElements) {
const tmp = currentObject[pathElm];
if (tmp === undefined) {
return undefined;
}
currentObject = tmp;
}
return currentObject;
}
function extractTSAndOffset(mainpath: string, extrapath: string, extratype: string) {
let ts: string | undefined = undefined;
let offset: string | undefined = undefined;
//line below is programmatic way of finding a timestamp in the exif object. For example "xmp.CreateDate", from the DateTags list
//ts = exif.xmp?.CreateDate
ts = getValue(exif, mainpath);
if (ts) {
if (!extratype || extratype == 'O') { //offset can be in the timestamp itself
[ts, offset] = Utils.splitTimestampAndOffset(ts);
if (extratype == 'O' && !offset) { //offset in the extra tag and not already extracted from main tag
offset = getValue(exif, extrapath);
}
} else if (extratype == 'T') { //date only in main tag, time in the extra tag
ts = Utils.toIsoTimestampString(ts, getValue(exif, extrapath));
[ts, offset] = Utils.splitTimestampAndOffset(ts);
}
}
return [ts, offset];
}
}
private static mapCameraData(metadata: PhotoMetadata, exif: any) {
metadata.cameraData = metadata.cameraData || {};
metadata.cameraData.make = exif.ifd0?.Make || exif.tiff?.Make || metadata.cameraData.make;
metadata.cameraData.model = exif.ifd0?.Model || exif.tiff?.Model || metadata.cameraData.model;
metadata.cameraData.lens = exif.exif?.LensModel || exif.exifEX?.LensModel || metadata.cameraData.lens;
if (exif.exif) {
if (Utils.isUInt32(exif.exif.ISO)) {
metadata.cameraData.ISO = parseInt('' + exif.exif.ISO, 10);
}
if (Utils.isFloat32(exif.exif.FocalLength)) {
metadata.cameraData.focalLength = parseFloat(
'' + exif.exif.FocalLength
);
}
if (Utils.isFloat32(exif.exif.ExposureTime)) {
metadata.cameraData.exposure = parseFloat(
parseFloat('' + exif.exif.ExposureTime).toFixed(6)
);
}
if (Utils.isFloat32(exif.exif.FNumber)) {
metadata.cameraData.fStop = parseFloat(
parseFloat('' + exif.exif.FNumber).toFixed(2)
);
}
}
Utils.removeNullOrEmptyObj(metadata.cameraData);
if (Object.keys(metadata.cameraData).length === 0) {
delete metadata.cameraData;
}
}
private static mapGPS(metadata: PhotoMetadata, exif: any) {
try {
if (exif.gps || (exif.exif && exif.exif.GPSLatitude && exif.exif.GPSLongitude)) {
metadata.positionData = metadata.positionData || {};
metadata.positionData.GPSData = metadata.positionData.GPSData || {};
metadata.positionData.GPSData.longitude = Utils.isFloat32(exif.gps?.longitude) ? exif.gps.longitude : Utils.xmpExifGpsCoordinateToDecimalDegrees(exif.exif.GPSLongitude);
metadata.positionData.GPSData.latitude = Utils.isFloat32(exif.gps?.latitude) ? exif.gps.latitude : Utils.xmpExifGpsCoordinateToDecimalDegrees(exif.exif.GPSLatitude);
if (metadata.positionData.GPSData.longitude !== undefined) {
metadata.positionData.GPSData.longitude = parseFloat(metadata.positionData.GPSData.longitude.toFixed(6))
}
if (metadata.positionData.GPSData.latitude !== undefined) {
metadata.positionData.GPSData.latitude = parseFloat(metadata.positionData.GPSData.latitude.toFixed(6))
}
}
} catch (err) {
Logger.error(LOG_TAG, 'Error during reading of GPS data: ' + err);
} finally {
if (metadata.positionData) {
Utils.removeNullOrEmptyObj(metadata.positionData);
if (Object.keys(metadata.positionData).length === 0) {
delete metadata.positionData;
}
}
}
}
private static mapToponyms(metadata: PhotoMetadata, exif: any) {
//Function to convert html code for special characters into their corresponding character (used in exif.photoshop-section)
metadata.positionData = metadata.positionData || {};
metadata.positionData.country = Utils.asciiToUTF8(exif.iptc?.Country) || Utils.decodeHTMLChars(exif.photoshop?.Country);
metadata.positionData.state = Utils.asciiToUTF8(exif.iptc?.State) || Utils.decodeHTMLChars(exif.photoshop?.State);
metadata.positionData.city = Utils.asciiToUTF8(exif.iptc?.City) || Utils.decodeHTMLChars(exif.photoshop?.City);
if (metadata.positionData) {
Utils.removeNullOrEmptyObj(metadata.positionData);
if (Object.keys(metadata.positionData).length === 0) {
delete metadata.positionData;
}
}
}
private static mapRating(metadata: PhotoMetadata, exif: any) {
if (exif.xmp &&
exif.xmp.Rating !== undefined) {
const rting = Math.round(exif.xmp.Rating);
if (rting <= 0) {
//We map all ratings below 0 to 0. Lightroom supports value -1, but most other tools (including this) don't.
//Rating 0 means "unrated" according to adobe's spec, so we delete the attribute in pigallery for the same effect
delete metadata.rating;
} else if (rting > 5) { //map all ratings above 5 to 5
metadata.rating = 5;
} else {
metadata.rating = (rting as RatingTypes);
}
}
}
private static mapFaces(metadata: PhotoMetadata, exif: any, orientation: number) {
//xmp."mwg-rs" section
if (exif["mwg-rs"] &&
exif["mwg-rs"].Regions) {
const faces: FaceRegion[] = [];
const regionListVal = Array.isArray(exif["mwg-rs"].Regions.RegionList) ? exif["mwg-rs"].Regions.RegionList : [exif["mwg-rs"].Regions.RegionList];
if (regionListVal) {
for (const regionRoot of regionListVal) {
let type;
let name;
let box;
const createFaceBox = (
w: string,
h: string,
x: string,
y: string
) => {
if (4 < orientation) { //roation is sidewards (90 or 270 degrees)
[x, y] = [y, x];
[w, h] = [h, w];
}
let swapX = 0;
let swapY = 0;
switch (orientation) {
case 2: //TOP RIGHT (Mirror horizontal):
case 6: //RIGHT TOP (Rotate 90 CW)
swapX = 1;
break;
case 3: // BOTTOM RIGHT (Rotate 180)
case 7: // RIGHT BOTTOM (Mirror horizontal and rotate 90 CW)
swapX = 1;
swapY = 1;
break;
case 4: //BOTTOM_LEFT (Mirror vertical)
case 8: //LEFT_BOTTOM (Rotate 270 CW)
swapY = 1;
break;
}
// converting ratio to px
return {
width: Math.round(parseFloat(w) * metadata.size.width),
height: Math.round(parseFloat(h) * metadata.size.height),
left: Math.round(Math.abs(parseFloat(x) - swapX) * metadata.size.width),
top: Math.round(Math.abs(parseFloat(y) - swapY) * metadata.size.height),
};
};
/* Adobe Lightroom based face region structure */
if (
regionRoot &&
regionRoot['rdf:Description'] &&
regionRoot['rdf:Description'] &&
regionRoot['rdf:Description']['mwg-rs:Area']
) {
const region = regionRoot['rdf:Description'];
const regionBox = region['mwg-rs:Area'].attributes;
name = region['mwg-rs:Name'];
type = region['mwg-rs:Type'];
box = createFaceBox(
regionBox['stArea:w'],
regionBox['stArea:h'],
regionBox['stArea:x'],
regionBox['stArea:y']
);
/* Load exiftool edited face region structure, see github issue #191 */
} else if (
regionRoot &&
regionRoot.Name &&
regionRoot.Type &&
regionRoot.Area
) {
const regionBox = regionRoot.Area;
name = regionRoot.Name;
type = regionRoot.Type;
box = createFaceBox(
regionBox.w,
regionBox.h,
regionBox.x,
regionBox.y
);
}
if (type !== 'Face' || !name) {
continue;
}
// convert center base box to corner based box
box.left = Math.round(Math.max(0, box.left - box.width / 2));
box.top = Math.round(Math.max(0, box.top - box.height / 2));
faces.push({ name, box });
}
}
if (faces.length > 0) {
metadata.faces = faces; // save faces
if (Config.Faces.keywordsToPersons) {
// remove faces from keywords
metadata.faces.forEach((f) => {
const index = metadata.keywords.indexOf(f.name);
if (index !== -1) {
metadata.keywords.splice(index, 1);
}
});
}
}
}
}
}