using exif.js to get the direction information of a picture has been reported incorrectly. Some pictures have the following errors, and some pictures can get the direction information of a picture more than enough
/ / Please paste the code text below (do not replace the code with pictures)
is a problem with the EXIF.js library itself. This problem occurs when parsing images with a resolution greater than 600dpi, which has not been solved so far. see here . If you just want to get the direction of the picture, you can use the following code:
getOrientation = function (file, callback) {
var reader = new window.FileReader();
reader.onload = function (e) {
var view = new window.DataView(e.target.result);
if (view.getUint16(0, false) != 0xFFD8) {
return callback(-2);
}
var length = view.byteLength, offset = 2;
while (offset < length) {
var marker = view.getUint16(offset, false);
offset += 2;
if (marker == 0xFFE1) {
if (view.getUint32(offset += 2, false) != 0x45786966) {
return callback(-1);
}
var little = view.getUint16(offset += 6, false) == 0x4949;
offset += view.getUint32(offset + 4, little);
var tags = view.getUint16(offset, little);
offset += 2;
for (var i = 0; i < tags; iPP) {
if (view.getUint16(offset + (i * 12), little) == 0x0112) {
return callback(view.getUint16(offset + (i * 12) + 8, little));
}
}
} else if ((marker & 0xFF00) != 0xFF00) {
break;
} else {
offset += view.getUint16(offset, false);
}
}
return callback(-1);
};
reader.readAsArrayBuffer(file);
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