js-dicom/src/ImageUtility/getEncapsulatedImageFrame.js

this is js-dicom

//import * as dicomParser from 'dicom-parser';
import * as dicomParser from '../dicomParser/index';

/**
 * Function to deal with extracting an image frame from an encapsulated data set.
 */


function framesAreFragmented (dataSet) {
    const numberOfFrames = dataSet.intString('x00280008');
    const pixelDataElement = dataSet.elements.x7fe00010;

    return (numberOfFrames !== pixelDataElement.fragments.length);
}

export default function getEncapsulatedImageFrame (dataSet, frameIndex) {
    if (dataSet.elements.x7fe00010.basicOffsetTable.length) {
        // Basic Offset Table is not empty
        return dicomParser.readEncapsulatedImageFrame(dataSet, dataSet.elements.x7fe00010, frameIndex);
    }

    // Empty basic offset table

    if (framesAreFragmented(dataSet)) {
        const basicOffsetTable = dicomParser.createJPEGBasicOffsetTable(dataSet, dataSet.elements.x7fe00010);

        return dicomParser.readEncapsulatedImageFrame(dataSet, dataSet.elements.x7fe00010, frameIndex, basicOffsetTable);
    }

    return dicomParser.readEncapsulatedPixelDataFromFragments(dataSet, dataSet.elements.x7fe00010, frameIndex);
}