Rotate byte array of JPEG after onPictureTaken

Question

Is there a way to rotate byte array without decoding it to Bitmap?

Currently in jpeg PictureCallback I just write byte array directly to file. But pictures are rotated. I would like to rotate them without decoding to bitmap with hope that this will conserve my memory.

    BitmapFactory.Options o = new BitmapFactory.Options();
    o.inJustDecodeBounds = true;
    BitmapFactory.decodeByteArray(data, 0, data.length, o);

    int orientation;
    if (o.outHeight < o.outWidth) {
        orientation = 90;
    } else {
        orientation = 0;
    }

    File photo = new File(tmp, "demo.jpeg");

    FileOutputStream fos;
    BufferedOutputStream bos = null;
    try {
        fos = new FileOutputStream(photo);
        bos = new BufferedOutputStream(fos);
        bos.write(data);
        bos.flush();
    } catch (IOException e) {
        Log.e(TAG, "Failed to save photo", e);
    } finally {
        IOUtils.closeQuietly(bos);
    }

Hi. Did you managed to do this ? Thanks man. – Paul Jun 02 '13 at 19:52 — Paul, Jun 02 '13 at 19:52
@Paul: see http://stackoverflow.com/a/16655188/192373 – Alex Cohn Feb 09 '14 at 20:06 — Alex Cohn, Feb 09 '14 at 20:06
How can you use androidmediautil to solve this problem? – therealprashant Feb 25 '15 at 20:13 — therealprashant, Feb 25 '15 at 20:13

score 5 · Answer 1 · answered Aug 22 '13 at 17:00

5

Try this. It will solve the purpose.

Bitmap storedBitmap = BitmapFactory.decodeByteArray(data, 0, data.length, null);

Matrix mat = new Matrix();                        
mat.postRotate("angle");  // angle is the desired angle you wish to rotate            
storedBitmap = Bitmap.createBitmap(storedBitmap, 0, 0, storedBitmap.getWidth(), storedBitmap.getHeight(), mat, true);

answered Aug 22 '13 at 17:00

user2453055

975
1
9
19

8

Please, read the question - I need to rotate byte array without decoding it to Bitmap. – Martynas Jurkus Aug 22 '13 at 20:56
clearly mentioned that rotation needs to be done without decoding. – therealprashant Feb 25 '15 at 20:10

Alex Cohn · Answer 2 · 2014-04-07T10:17:52.017

3

You can set JPEG rotation via Exif header without decoding it. This is the most efficient method, but some viewers may still show a rotated image.

Alternatively, you can use JPEG lossless rotation. ~~Unfortunately, I am not aware of free Java implementations of this algorithm.~~

Update on SourceForge, there is a Java open source class LLJTran. The Android port is on GitHub.

edited Apr 07 '14 at 10:17

answered May 20 '13 at 17:46

Alex Cohn

56,089
9
113
307

1

Have you tried LLJtran for Android? It take 16s to rotate 2M jpeg file tested on Samsung Galaxy S1. Anyway to shorten the process time? – Yeung Sep 02 '14 at 04:15
Oh, too bad. Thanks for sharing. I will give it a look in spare time. – Alex Cohn Sep 02 '14 at 06:22
Please have on a look on [this](http://stackoverflow.com/a/25603218/1099884) to see if I have done something wrong with the library. – Yeung Sep 02 '14 at 08:01
Is there a simpler way to rotate and store full size image from the byte array without converting it to bitmap @AlexCohn – therealprashant Feb 26 '15 at 05:22
@therealprashant: unfortunately, there does not seem to be one. As many commenters noticed, LLJTran is not up to this challenge with the present-day typical picture sizes, memory and CPU. – Alex Cohn Feb 28 '15 at 10:57

score 2 · Accepted Answer · answered May 20 '13 at 14:44

2

I don't think that there is such possibility. Bytes order depends from picture encoding (png, jpeg). So you are forced to decode image to do something with it.

answered May 20 '13 at 14:44

user123

1,053
15
27

But Android documentation states that `public final void takePicture (Camera.ShutterCallback shutter, Camera.PictureCallback raw, Camera.PictureCallback jpeg)`. So in `Camera.PictureCallback jpeg` I will always receive JPEG image data. – Martynas Jurkus May 20 '13 at 14:54
1

But there is no method to rotate jpeg. Best thing you can do is to change Exif data. Not everything support this and it wont be true rotate. – user123 May 20 '13 at 14:57

score 2 · Answer 4 · answered Sep 15 '21 at 16:20

Try like this,

private byte[] rotateImage(byte[] data, int angle) {
    Log.d("labot_log_info","CameraActivity: Inside rotateImage");
    Bitmap bmp = BitmapFactory.decodeByteArray(data, 0, data.length, null);
    Matrix mat = new Matrix();
    mat.postRotate(angle);
    bmp = Bitmap.createBitmap(bmp, 0, 0, bmp.getWidth(), bmp.getHeight(), mat, true);
    ByteArrayOutputStream stream = new ByteArrayOutputStream();
    bmp.compress(Bitmap.CompressFormat.JPEG, 100, stream);
    return stream.toByteArray();
}

You can call the rotateImage by providing the image data which is getting from onPictureTaken method and an angle for rotation.

Eg: rotateImage(data, 90);

Rotate byte array of JPEG after onPictureTaken

4 Answers4

Linked