How to display image from binary data in javascript?

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I am storing binary data in array (videoDataArr) and want to display in browser using javascript.

What I have tried:

for (var i = 0; i < video1Size - 14; i++)
{
    video1Data += String.fromCharCode(chunk8View[dataIndex++]);
}
        
video1Data += video1;
// alert("vid1:"+video1Data);       
       
if(partnumber == 003)
{
    //alert("partnumber:" + partnumber + "packetnumber:");

    videoDataArr.push(video1Data);

    alert("videoDataArr:" + videoDataArr);
              
    var imgdata=btoa(videoDataArr);
    //displayImg(imgdata);
            
    window.open('data:image/jpeg;,' + imgdata);
}

Posted 5-Jul-16 21:46pm

Asmita Pathak

Updated 22-Jul-16 5:35am

Prava-MFS

v2

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Beginner Luck 7-Jul-16 4:31am

you using which?? canvas or svg or image to display because they use a bit different way??

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Sangeet Das · Answer 1 · 2016-07-22T05:35:00

Need to convert it in base64.

JS have btoa() function for it.

For example:

JavaScript

var img = document.createElement('img');
img.src = 'data:image/jpeg;base64,' + btoa('your-binary-data');
document.body.appendChild(img);

But i think what your binary data in pastebin is invalid - the jpeg data must be ended on 'ffd9'.

Update:

Need to write simple hex to base64 converter:

JavaScript

function hexToBase64(str) {
    return btoa(String.fromCharCode.apply(null, str.replace(/\r|\n/g, "").replace(/([\da-fA-F]{2}) ?/g, "0x$1 ").replace(/ +$/, "").split(" ")));
}

And use it:

JavaScript

img.src = 'data:image/jpeg;base64,' + hexToBase64('your-binary-data');

See working example with your hex data on jsfiddle

How to display image from binary data in javascript?

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