vue拍的视频怎么在oppo手机相册里找不到_百度知道
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vue拍的视频怎么在oppo手机相册里找不到
我有更好的答案
文件管理里找
亲，拍的视频您可以到，文件管理～视频里查看
你好，一般手机相册不存在，可以在文件管理～视频查看。
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回答问题，赢新手礼包Vue2.0实现调用摄像头进行拍照功能以及图片上传功能引用exif.js（2） - iceking66的博客 - CSDN博客
Vue2.0实现调用摄像头进行拍照功能以及图片上传功能引用exif.js（2）
可以在github 上下载demo链接&
vue组件代码
&template&
&div style=&padding:20&&
&div class=&show&&
&div class=&picture& :style=&'backgroundImage:url('+headerImage+')'&&&/div&
&div style=&margin-top:20&&
&input type=&file& id=&upload& accept=&image/jpg& @change=&upload&&
&label for=&upload&&&/label&
&/template&
import {Exif} from './exif.js'
export default {
headerImage:'',picValue:''
mounted () {
methods: {
upload (e) {
let files = e.target.files || e.dataTransfer.files;
if (!files.length) return;
this.picValue = files[0];
this.imgPreview(this.picValue);
console.log(this.picValue)
imgPreview (file) {
let self = this;
let Orientation;
//去获取拍照时的信息，解决拍出来的照片旋转问题
Exif.getData(file, function(){
Orientation = Exif.getTag(this, 'Orientation');
// 看支持不支持FileReader
if (!file || !window.FileReader) return;
if (/^image/.test(file.type)) {
// 创建一个reader
let reader = new FileReader();
// 将图片2将转成 base64 格式
reader.readAsDataURL(file);
// 读取成功后的回调
reader.onloadend = function () {
let result = this.result;
let img = new Image();
img.src = result;
//判断图片是否大于100K,是就直接上传，反之压缩图片
if (this.result.length &= (100 * 1024)) {
self.headerImage = this.result;
self.postImg();
img.onload = function () {
let data = self.compress(img,Orientation);
self.headerImage = data;
self.postImg();
postImg () {
//这里写接口
rotateImg (img, direction,canvas) {
//最小与最大旋转方向，图片旋转4次后回到原方向
const min_step = 0;
const max_step = 3;
if (img == null)return;
//img的高度和宽度不能在img元素隐藏后获取，否则会出错
let height = img.height;
let width = img.width;
let step = 2;
if (step == null) {
step = min_step;
if (direction == 'right') {
step++;
//旋转到原位置，即超过最大值
step & max_step && (step = min_step);
step & min_step && (step = max_step);
//旋转角度以弧度值为参数
let degree = step * 90 * Math.PI / 180;
let ctx = canvas.getContext('2d');
switch (step) {
canvas.width = width;
canvas.height = height;
ctx.drawImage(img, 0, 0);
canvas.width = height;
canvas.height = width;
ctx.rotate(degree);
ctx.drawImage(img, 0, -height);
canvas.width = width;
canvas.height = height;
ctx.rotate(degree);
ctx.drawImage(img, -width, -height);
canvas.width = height;
canvas.height = width;
ctx.rotate(degree);
ctx.drawImage(img, -width, 0);
compress(img,Orientation) {
let canvas = document.createElement(&canvas&);
let ctx = canvas.getContext('2d');
//瓦片canvas
let tCanvas = document.createElement(&canvas&);
let tctx = tCanvas.getContext(&2d&);
let initSize = img.src.length;
let width = img.width;
let height = img.height;
//如果图片大于四百万像素，计算压缩比并将大小压至400万以下
let ratio;
if ((ratio = width * height / 4000000) & 1) {
console.log(&大于400万像素&)
ratio = Math.sqrt(ratio);
width /= ratio;
height /= ratio;
ratio = 1;
canvas.width = width;
canvas.height = height;
ctx.fillStyle = &#fff&;
ctx.fillRect(0, 0, canvas.width, canvas.height);
//如果图片像素大于100万则使用瓦片绘制
let count;
if ((count = width * height / 1000000) & 1) {
console.log(&超过100W像素&);
count = ~~(Math.sqrt(count) + 1); //计算要分成多少块瓦片
计算每块瓦片的宽和高
let nw = ~~(width / count);
let nh = ~~(height / count);
tCanvas.width = nw;
tCanvas.height = nh;
for (let i = 0; i & count; i++) {
for (let j = 0; j & count; j++) {
tctx.drawImage(img, i * nw * ratio, j * nh * ratio, nw * ratio, nh * ratio, 0, 0, nw, nh);
ctx.drawImage(tCanvas, i * nw, j * nh, nw, nh);
ctx.drawImage(img, 0, 0, width, height);
//修复ios上传图片的时候 被旋转的问题
if(Orientation != && && Orientation != 1){
switch(Orientation){
case 6://需要顺时针（向左）90度旋转
this.rotateImg(img,'left',canvas);
case 8://需要逆时针（向右）90度旋转
this.rotateImg(img,'right',canvas);
case 3://需要180度旋转
this.rotateImg(img,'right',canvas);//转两次
this.rotateImg(img,'right',canvas);
//进行最小压缩
let ndata = canvas.toDataURL('image/jpeg', 0.1);
console.log('压缩前：' + initSize);
console.log('压缩后：' + ndata.length);
console.log('压缩率：' + ~~(100 * (initSize - ndata.length) / initSize) + &%&);
tCanvas.width = tCanvas.height = canvas.width = canvas.height = 0;
return ndata;
margin: 0;
padding: 0;
width: 100px;
height: 100px;
overflow: hidden;
position: relative;
border-radius: 50%;
border: 1px solid #d5d5d5;
.picture {
width: 100%;
height: 100%;
overflow: hidden;
background-position: center center;
background-repeat: no-repeat;
background-size: cover;
引用的exif.js代码
(function() {
var debug = false;
var root = this;
var EXIF = function(obj) {
if (obj instanceof EXIF) return obj;
if (!(this instanceof EXIF)) return new EXIF(obj);
this.EXIFwrapped = obj;
if (typeof exports !== 'undefined') {
if (typeof module !== 'undefined' && module.exports) {
exports = module.exports = EXIF;
exports.EXIF = EXIF;
root.EXIF = EXIF;
var ExifTags = EXIF.Tags = {
// version tags
0x9000 : &ExifVersion&,
// EXIF version
0xA000 : &FlashpixVersion&,
// Flashpix format version
// colorspace tags
0xA001 : &ColorSpace&,
// Color space information tag
// image configuration
0xA002 : &PixelXDimension&,
// Valid width of meaningful image
0xA003 : &PixelYDimension&,
// Valid height of meaningful image
0x9101 : &ComponentsConfiguration&, // Information about channels
0x9102 : &CompressedBitsPerPixel&,
// Compressed bits per pixel
// user information
0x927C : &MakerNote&,
// Any desired information written by the manufacturer
0x9286 : &UserComment&,
// Comments by user
// related file
0xA004 : &RelatedSoundFile&,
// Name of related sound file
// date and time
0x9003 : &DateTimeOriginal&,
// Date and time when the original image was generated
0x9004 : &DateTimeDigitized&,
// Date and time when the image was stored digitally
0x9290 : &SubsecTime&,
// Fractions of seconds for DateTime
0x9291 : &SubsecTimeOriginal&,
// Fractions of seconds for DateTimeOriginal
0x9292 : &SubsecTimeDigitized&,
// Fractions of seconds for DateTimeDigitized
// picture-taking conditions
0x829A : &ExposureTime&,
// Exposure time (in seconds)
0x829D : &FNumber&,
// F number
0x8822 : &ExposureProgram&,
// Exposure program
0x8824 : &SpectralSensitivity&,
// Spectral sensitivity
0x8827 : &ISOSpeedRatings&,
// ISO speed rating
0x8828 : &OECF&,
// Optoelectric conversion factor
0x9201 : &ShutterSpeedValue&,
// Shutter speed
0x9202 : &ApertureValue&,
// Lens aperture
0x9203 : &BrightnessValue&,
// Value of brightness
0x9204 : &ExposureBias&,
// Exposure bias
0x9205 : &MaxApertureValue&,
// Smallest F number of lens
0x9206 : &SubjectDistance&,
// Distance to subject in meters
0x9207 : &MeteringMode&,
// Metering mode
0x9208 : &LightSource&,
// Kind of light source
0x9209 : &Flash&,
// Flash status
0x9214 : &SubjectArea&,
// Location and area of main subject
0x920A : &FocalLength&,
// Focal length of the lens in mm
0xA20B : &FlashEnergy&,
// Strobe energy in BCPS
0xA20C : &SpatialFrequencyResponse&,
0xA20E : &FocalPlaneXResolution&,
// Number of pixels in width direction per FocalPlaneResolutionUnit
0xA20F : &FocalPlaneYResolution&,
// Number of pixels in height direction per FocalPlaneResolutionUnit
0xA210 : &FocalPlaneResolutionUnit&,
// Unit for measuring FocalPlaneXResolution and FocalPlaneYResolution
0xA214 : &SubjectLocation&,
// Location of subject in image
0xA215 : &ExposureIndex&,
// Exposure index selected on camera
0xA217 : &SensingMethod&,
// Image sensor type
0xA300 : &FileSource&,
// Image source (3 == DSC)
0xA301 : &SceneType&,
// Scene type (1 == directly photographed)
0xA302 : &CFAPattern&,
// Color filter array geometric pattern
0xA401 : &CustomRendered&,
// Special processing
0xA402 : &ExposureMode&,
// Exposure mode
0xA403 : &WhiteBalance&,
// 1 = auto white balance, 2 = manual
0xA404 : &DigitalZoomRation&,
// Digital zoom ratio
0xA405 : &FocalLengthIn35mmFilm&,
// Equivalent foacl length assuming 35mm film camera (in mm)
0xA406 : &SceneCaptureType&,
// Type of scene
0xA407 : &GainControl&,
// Degree of overall image gain adjustment
0xA408 : &Contrast&,
// Direction of contrast processing applied by camera
0xA409 : &Saturation&,
// Direction of saturation processing applied by camera
0xA40A : &Sharpness&,
// Direction of sharpness processing applied by camera
0xA40B : &DeviceSettingDescription&,
0xA40C : &SubjectDistanceRange&,
// Distance to subject
// other tags
0xA005 : &InteroperabilityIFDPointer&,
0xA420 : &ImageUniqueID&
// Identifier assigned uniquely to each image
var TiffTags = EXIF.TiffTags = {
0x0100 : &ImageWidth&,
0x0101 : &ImageHeight&,
0x8769 : &ExifIFDPointer&,
0x8825 : &GPSInfoIFDPointer&,
0xA005 : &InteroperabilityIFDPointer&,
0x0102 : &BitsPerSample&,
0x0103 : &Compression&,
0x0106 : &PhotometricInterpretation&,
0x0112 : &Orientation&,
0x0115 : &SamplesPerPixel&,
0x011C : &PlanarConfiguration&,
0x0212 : &YCbCrSubSampling&,
0x0213 : &YCbCrPositioning&,
0x011A : &XResolution&,
0x011B : &YResolution&,
0x0128 : &ResolutionUnit&,
0x0111 : &StripOffsets&,
0x0116 : &RowsPerStrip&,
0x0117 : &StripByteCounts&,
0x0201 : &JPEGInterchangeFormat&,
0x0202 : &JPEGInterchangeFormatLength&,
0x012D : &TransferFunction&,
0x013E : &WhitePoint&,
0x013F : &PrimaryChromaticities&,
0x0211 : &YCbCrCoefficients&,
0x0214 : &ReferenceBlackWhite&,
0x0132 : &DateTime&,
0x010E : &ImageDescription&,
0x010F : &Make&,
0x0110 : &Model&,
0x0131 : &Software&,
0x013B : &Artist&,
0x8298 : &Copyright&
var GPSTags = EXIF.GPSTags = {
0x0000 : &GPSVersionID&,
0x0001 : &GPSLatitudeRef&,
0x0002 : &GPSLatitude&,
0x0003 : &GPSLongitudeRef&,
0x0004 : &GPSLongitude&,
0x0005 : &GPSAltitudeRef&,
0x0006 : &GPSAltitude&,
0x0007 : &GPSTimeStamp&,
0x0008 : &GPSSatellites&,
0x0009 : &GPSStatus&,
0x000A : &GPSMeasureMode&,
0x000B : &GPSDOP&,
0x000C : &GPSSpeedRef&,
0x000D : &GPSSpeed&,
0x000E : &GPSTrackRef&,
0x000F : &GPSTrack&,
0x0010 : &GPSImgDirectionRef&,
0x0011 : &GPSImgDirection&,
0x0012 : &GPSMapDatum&,
0x0013 : &GPSDestLatitudeRef&,
0x0014 : &GPSDestLatitude&,
0x0015 : &GPSDestLongitudeRef&,
0x0016 : &GPSDestLongitude&,
0x0017 : &GPSDestBearingRef&,
0x0018 : &GPSDestBearing&,
0x0019 : &GPSDestDistanceRef&,
0x001A : &GPSDestDistance&,
0x001B : &GPSProcessingMethod&,
0x001C : &GPSAreaInformation&,
0x001D : &GPSDateStamp&,
0x001E : &GPSDifferential&
var StringValues = EXIF.StringValues = {
ExposureProgram : {
0 : &Not defined&,
1 : &Manual&,
2 : &Normal program&,
3 : &Aperture priority&,
4 : &Shutter priority&,
5 : &Creative program&,
6 : &Action program&,
7 : &Portrait mode&,
8 : &Landscape mode&
MeteringMode : {
0 : &Unknown&,
1 : &Average&,
2 : &CenterWeightedAverage&,
3 : &Spot&,
4 : &MultiSpot&,
5 : &Pattern&,
6 : &Partial&,
255 : &Other&
LightSource : {
0 : &Unknown&,
1 : &Daylight&,
2 : &Fluorescent&,
3 : &Tungsten (incandescent light)&,
4 : &Flash&,
9 : &Fine weather&,
10 : &Cloudy weather&,
11 : &Shade&,
12 : &Daylight fluorescent (D 5700 - 7100K)&,
13 : &Day white fluorescent (N 4600 - 5400K)&,
14 : &Cool white fluorescent (W 3900 - 4500K)&,
15 : &White fluorescent (WW 3200 - 3700K)&,
17 : &Standard light A&,
18 : &Standard light B&,
19 : &Standard light C&,
20 : &D55&,
21 : &D65&,
22 : &D75&,
23 : &D50&,
24 : &ISO studio tungsten&,
255 : &Other&
0x0000 : &Flash did not fire&,
0x0001 : &Flash fired&,
0x0005 : &Strobe return light not detected&,
0x0007 : &Strobe return light detected&,
0x0009 : &Flash fired, compulsory flash mode&,
0x000D : &Flash fired, compulsory flash mode, return light not detected&,
0x000F : &Flash fired, compulsory flash mode, return light detected&,
0x0010 : &Flash did not fire, compulsory flash mode&,
0x0018 : &Flash did not fire, auto mode&,
0x0019 : &Flash fired, auto mode&,
0x001D : &Flash fired, auto mode, return light not detected&,
0x001F : &Flash fired, auto mode, return light detected&,
0x0020 : &No flash function&,
0x0041 : &Flash fired, red-eye reduction mode&,
0x0045 : &Flash fired, red-eye reduction mode, return light not detected&,
0x0047 : &Flash fired, red-eye reduction mode, return light detected&,
0x0049 : &Flash fired, compulsory flash mode, red-eye reduction mode&,
0x004D : &Flash fired, compulsory flash mode, red-eye reduction mode, return light not detected&,
0x004F : &Flash fired, compulsory flash mode, red-eye reduction mode, return light detected&,
0x0059 : &Flash fired, auto mode, red-eye reduction mode&,
0x005D : &Flash fired, auto mode, return light not detected, red-eye reduction mode&,
0x005F : &Flash fired, auto mode, return light detected, red-eye reduction mode&
SensingMethod : {
1 : &Not defined&,
2 : &One-chip color area sensor&,
3 : &Two-chip color area sensor&,
4 : &Three-chip color area sensor&,
5 : &Color sequential area sensor&,
7 : &Trilinear sensor&,
8 : &Color sequential linear sensor&
SceneCaptureType : {
0 : &Standard&,
1 : &Landscape&,
2 : &Portrait&,
3 : &Night scene&
SceneType : {
1 : &Directly photographed&
CustomRendered : {
0 : &Normal process&,
1 : &Custom process&
WhiteBalance : {
0 : &Auto white balance&,
1 : &Manual white balance&
GainControl : {
0 : &None&,
1 : &Low gain up&,
2 : &High gain up&,
3 : &Low gain down&,
4 : &High gain down&
Contrast : {
0 : &Normal&,
1 : &Soft&,
2 : &Hard&
Saturation : {
0 : &Normal&,
1 : &Low saturation&,
2 : &High saturation&
Sharpness : {
0 : &Normal&,
1 : &Soft&,
2 : &Hard&
SubjectDistanceRange : {
0 : &Unknown&,
1 : &Macro&,
2 : &Close view&,
3 : &Distant view&
FileSource : {
Components : {
function addEvent(element, event, handler) {
if (element.addEventListener) {
element.addEventListener(event, handler, false);
} else if (element.attachEvent) {
element.attachEvent(&on& + event, handler);
function imageHasData(img) {
return !!(img.exifdata);
function base64ToArrayBuffer(base64, contentType) {
contentType = contentType || base64.match(/^data\:([^\;]+)\;base64,/mi)[1] || ''; // e.g. 'data:image/base64,...' =& 'image/jpeg'
base64 = base64.replace(/^data\:([^\;]+)\;base64,/gmi, '');
var binary = atob(base64);
var len = binary.length;
var buffer = new ArrayBuffer(len);
var view = new Uint8Array(buffer);
for (var i = 0; i & len; i++) {
view[i] = binary.charCodeAt(i);
return buffer;
function objectURLToBlob(url, callback) {
var http = new XMLHttpRequest();
http.open(&GET&, url, true);
http.responseType = &blob&;
http.onload = function(e) {
if (this.status == 200 || this.status === 0) {
callback(this.response);
http.send();
function getImageData(img, callback) {
function handleBinaryFile(binFile) {
var data = findEXIFinJPEG(binFile);
var iptcdata = findIPTCinJPEG(binFile);
img.exifdata = data || {};
img.iptcdata = iptcdata || {};
if (callback) {
callback.call(img);
if (img.src) {
if (/^data\:/i.test(img.src)) { // Data URI
var arrayBuffer = base64ToArrayBuffer(img.src);
handleBinaryFile(arrayBuffer);
} else if (/^blob\:/i.test(img.src)) { // Object URL
var fileReader = new FileReader();
fileReader.onload = function(e) {
handleBinaryFile(e.target.result);
objectURLToBlob(img.src, function (blob) {
fileReader.readAsArrayBuffer(blob);
var http = new XMLHttpRequest();
http.onload = function() {
if (this.status == 200 || this.status === 0) {
handleBinaryFile(http.response);
throw &Could not load image&;
http = null;
http.open(&GET&, img.src, true);
http.responseType = &arraybuffer&;
http.send(null);
} else if (window.FileReader && (img instanceof window.Blob || img instanceof window.File)) {
var fileReader = new FileReader();
fileReader.onload = function(e) {
if (debug) console.log(&Got file of length & + e.target.result.byteLength);
handleBinaryFile(e.target.result);
fileReader.readAsArrayBuffer(img);
function findEXIFinJPEG(file) {
var dataView = new DataView(file);
if (debug) console.log(&Got file of length & + file.byteLength);
if ((dataView.getUint8(0) != 0xFF) || (dataView.getUint8(1) != 0xD8)) {
if (debug) console.log(&Not a valid JPEG&);
return false; // not a valid jpeg
var offset = 2,
length = file.byteLength,
while (offset & length) {
if (dataView.getUint8(offset) != 0xFF) {
if (debug) console.log(&Not a valid marker at offset & + offset + &, found: & + dataView.getUint8(offset));
return false; // not a valid marker, something is wrong
marker = dataView.getUint8(offset + 1);
if (debug) console.log(marker);
// we could implement handling for other markers here,
// but we're only looking for 0xFFE1 for EXIF data
if (marker == 225) {
if (debug) console.log(&Found 0xFFE1 marker&);
return readEXIFData(dataView, offset + 4, dataView.getUint16(offset + 2) - 2);
// offset += 2 + file.getShortAt(offset+2, true);
offset += 2 + dataView.getUint16(offset+2);
function findIPTCinJPEG(file) {
var dataView = new DataView(file);
if (debug) console.log(&Got file of length & + file.byteLength);
if ((dataView.getUint8(0) != 0xFF) || (dataView.getUint8(1) != 0xD8)) {
if (debug) console.log(&Not a valid JPEG&);
return false; // not a valid jpeg
var offset = 2,
length = file.byteLength;
var isFieldSegmentStart = function(dataView, offset){
dataView.getUint8(offset) === 0x38 &&
dataView.getUint8(offset+1) === 0x42 &&
dataView.getUint8(offset+2) === 0x49 &&
dataView.getUint8(offset+3) === 0x4D &&
dataView.getUint8(offset+4) === 0x04 &&
dataView.getUint8(offset+5) === 0x04
while (offset & length) {
if ( isFieldSegmentStart(dataView, offset )){
// Get the length of the name header (which is padded to an even number of bytes)
var nameHeaderLength = dataView.getUint8(offset+7);
if(nameHeaderLength % 2 !== 0) nameHeaderLength += 1;
// Check for pre photoshop 6 format
if(nameHeaderLength === 0) {
// Always 4
nameHeaderLength = 4;
var startOffset = offset + 8 + nameHeaderLength;
var sectionLength = dataView.getUint16(offset + 6 + nameHeaderLength);
return readIPTCData(file, startOffset, sectionLength);
// Not the marker, continue searching
offset++;
var IptcFieldMap = {
0x78 : 'caption',
0x6E : 'credit',
0x19 : 'keywords',
0x37 : 'dateCreated',
0x50 : 'byline',
0x55 : 'bylineTitle',
0x7A : 'captionWriter',
0x69 : 'headline',
0x74 : 'copyright',
0x0F : 'category'
function readIPTCData(file, startOffset, sectionLength){
var dataView = new DataView(file);
var data = {};
var fieldValue, fieldName, dataSize, segmentType, segmentSize;
var segmentStartPos = startOffset;
while(segmentStartPos & startOffset+sectionLength) {
if(dataView.getUint8(segmentStartPos) === 0x1C && dataView.getUint8(segmentStartPos+1) === 0x02){
segmentType = dataView.getUint8(segmentStartPos+2);
if(segmentType in IptcFieldMap) {
dataSize = dataView.getInt16(segmentStartPos+3);
segmentSize = dataSize + 5;
fieldName = IptcFieldMap[segmentType];
fieldValue = getStringFromDB(dataView, segmentStartPos+5, dataSize);
// Check if we already stored a value with this name
if(data.hasOwnProperty(fieldName)) {
// Value already stored with this name, create multivalue field
if(data[fieldName] instanceof Array) {
data[fieldName].push(fieldValue);
data[fieldName] = [data[fieldName], fieldValue];
data[fieldName] = fieldValue;
segmentStartPos++;
return data;
function readTags(file, tiffStart, dirStart, strings, bigEnd) {
var entries = file.getUint16(dirStart, !bigEnd),
tags = {},
entryOffset, tag,
for (i=0;i&entries;i++) {
entryOffset = dirStart + i*12 + 2;
tag = strings[file.getUint16(entryOffset, !bigEnd)];
if (!tag && debug) console.log(&Unknown tag: & + file.getUint16(entryOffset, !bigEnd));
tags[tag] = readTagValue(file, entryOffset, tiffStart, dirStart, bigEnd);
return tags;
function readTagValue(file, entryOffset, tiffStart, dirStart, bigEnd) {
var type = file.getUint16(entryOffset+2, !bigEnd),
numValues = file.getUint32(entryOffset+4, !bigEnd),
valueOffset = file.getUint32(entryOffset+8, !bigEnd) + tiffStart,
vals, val, n,
numerator, denominator;
switch (type) {
case 1: // byte, 8-bit unsigned int
case 7: // undefined, 8-bit byte, value depending on field
if (numValues == 1) {
return file.getUint8(entryOffset + 8, !bigEnd);
offset = numValues & 4 ? valueOffset : (entryOffset + 8);
vals = [];
for (n=0;n&numValues;n++) {
vals[n] = file.getUint8(offset + n);
return vals;
case 2: // ascii, 8-bit byte
offset = numValues & 4 ? valueOffset : (entryOffset + 8);
return getStringFromDB(file, offset, numValues-1);
case 3: // short, 16 bit int
if (numValues == 1) {
return file.getUint16(entryOffset + 8, !bigEnd);
offset = numValues & 2 ? valueOffset : (entryOffset + 8);
vals = [];
for (n=0;n&numValues;n++) {
vals[n] = file.getUint16(offset + 2*n, !bigEnd);
return vals;
case 4: // long, 32 bit int
if (numValues == 1) {
return file.getUint32(entryOffset + 8, !bigEnd);
vals = [];
for (n=0;n&numValues;n++) {
vals[n] = file.getUint32(valueOffset + 4*n, !bigEnd);
return vals;
// rational = two long values, first is numerator, second is denominator
if (numValues == 1) {
numerator = file.getUint32(valueOffset, !bigEnd);
denominator = file.getUint32(valueOffset+4, !bigEnd);
val = new Number(numerator / denominator);
val.numerator = numerator;
val.denominator = denominator;
return val;
vals = [];
for (n=0;n&numValues;n++) {
numerator = file.getUint32(valueOffset + 8*n, !bigEnd);
denominator = file.getUint32(valueOffset+4 + 8*n, !bigEnd);
vals[n] = new Number(numerator / denominator);
vals[n].numerator = numerator;
vals[n].denominator = denominator;
return vals;
case 9: // slong, 32 bit signed int
if (numValues == 1) {
return file.getInt32(entryOffset + 8, !bigEnd);
vals = [];
for (n=0;n&numValues;n++) {
vals[n] = file.getInt32(valueOffset + 4*n, !bigEnd);
return vals;
case 10: // signed rational, two slongs, first is numerator, second is denominator
if (numValues == 1) {
return file.getInt32(valueOffset, !bigEnd) / file.getInt32(valueOffset+4, !bigEnd);
vals = [];
for (n=0;n&numValues;n++) {
vals[n] = file.getInt32(valueOffset + 8*n, !bigEnd) / file.getInt32(valueOffset+4 + 8*n, !bigEnd);
return vals;
function getStringFromDB(buffer, start, length) {
var outstr = &&;
for (n = start; n & start+length; n++) {
outstr += String.fromCharCode(buffer.getUint8(n));
return outstr;
function readEXIFData(file, start) {
if (getStringFromDB(file, start, 4) != &Exif&) {
if (debug) console.log(&Not valid EXIF data! & + getStringFromDB(file, start, 4));
return false;
var bigEnd,
tags, tag,
exifData, gpsData,
tiffOffset = start + 6;
// test for TIFF validity and endianness
if (file.getUint16(tiffOffset) == 0x4949) {
bigEnd = false;
} else if (file.getUint16(tiffOffset) == 0x4D4D) {
bigEnd = true;
if (debug) console.log(&Not valid TIFF data! (no 0x4949 or 0x4D4D)&);
return false;
if (file.getUint16(tiffOffset+2, !bigEnd) != 0x002A) {
if (debug) console.log(&Not valid TIFF data! (no 0x002A)&);
return false;
var firstIFDOffset = file.getUint32(tiffOffset+4, !bigEnd);
if (firstIFDOffset & 0x) {
if (debug) console.log(&Not valid TIFF data! (First offset less than 8)&, file.getUint32(tiffOffset+4, !bigEnd));
return false;
tags = readTags(file, tiffOffset, tiffOffset + firstIFDOffset, TiffTags, bigEnd);
if (tags.ExifIFDPointer) {
exifData = readTags(file, tiffOffset, tiffOffset + tags.ExifIFDPointer, ExifTags, bigEnd);
for (tag in exifData) {
switch (tag) {
case &LightSource& :
case &Flash& :
case &MeteringMode& :
case &ExposureProgram& :
case &SensingMethod& :
case &SceneCaptureType& :
case &SceneType& :
case &CustomRendered& :
case &WhiteBalance& :
case &GainControl& :
case &Contrast& :
case &Saturation& :
case &Sharpness& :
case &SubjectDistanceRange& :
case &FileSource& :
exifData[tag] = StringValues[tag][exifData[tag]];
case &ExifVersion& :
case &FlashpixVersion& :
exifData[tag] = String.fromCharCode(exifData[tag][0], exifData[tag][1], exifData[tag][2], exifData[tag][3]);
case &ComponentsConfiguration& :
exifData[tag] =
StringValues.Components[exifData[tag][0]] +
StringValues.Components[exifData[tag][1]] +
StringValues.Components[exifData[tag][2]] +
StringValues.Components[exifData[tag][3]];
tags[tag] = exifData[tag];
if (tags.GPSInfoIFDPointer) {
gpsData = readTags(file, tiffOffset, tiffOffset + tags.GPSInfoIFDPointer, GPSTags, bigEnd);
for (tag in gpsData) {
switch (tag) {
case &GPSVersionID& :
gpsData[tag] = gpsData[tag][0] +
&.& + gpsData[tag][1] +
&.& + gpsData[tag][2] +
&.& + gpsData[tag][3];
tags[tag] = gpsData[tag];
return tags;
EXIF.getData = function(img, callback) {
if ((img instanceof Image || img instanceof HTMLImageElement) && !img.complete) return false;
if (!imageHasData(img)) {
getImageData(img, callback);
if (callback) {
callback.call(img);
return true;
EXIF.getTag = function(img, tag) {
if (!imageHasData(img)) return;
return img.exifdata[tag];
EXIF.getAllTags = function(img) {
if (!imageHasData(img)) return {};
data = img.exifdata,
tags = {};
for (a in data) {
if (data.hasOwnProperty(a)) {
tags[a] = data[a];
return tags;
EXIF.pretty = function(img) {
if (!imageHasData(img)) return &&;
data = img.exifdata,
strPretty = &&;
for (a in data) {
if (data.hasOwnProperty(a)) {
if (typeof data[a] == &object&) {
if (data[a] instanceof Number) {
strPretty += a + & : & + data[a] + & [& + data[a].numerator + &/& + data[a].denominator + &]\r\n&;
strPretty += a + & : [& + data[a].length + & values]\r\n&;
strPretty += a + & : & + data[a] + &\r\n&;
return strPretty;
EXIF.readFromBinaryFile = function(file) {
return findEXIFinJPEG(file);
if (typeof define === 'function' && define.amd) {
define('exif-js', [], function() {
return EXIF;
}.call(this));
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