Camera2 ImageReader freezes repeating capture request

Question

I'm trying to capture image data from the camera using the camera2 API. I've mostly used code taken from the android Capture2RAW example. Only a few images come through (i.e. calls to onImageAvailable) before stopping completely. I've tried capturing using the RAW_SENSOR and JPEG formats at different sizes with the same results. What am I doing wrong?

this.mImageReader = ImageReader.newInstance(width, height, ImageFormat.RAW_SENSOR, /*maxImages*/ 1);
Surface surface = this.mImageReader.getSurface();
final List<Surface> surfaces = Arrays.asList(surface);
this.mCamera.createCaptureSession(surfaces, new CameraCaptureSession.StateCallback() {
    // Callback methods here
}, null);
CaptureRequest.Builder captureRequestBuilder;
captureRequestBuilder = this.mCamera.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
captureRequestBuilder.addTarget(surface);
this.mCaptureRequest = captureRequestBuilder.build();
this.mCaptureSession.setRepeatingRequest(mCaptureRequest, null, null);

score 23 · Accepted Answer · answered Jan 07 '16 at 22:09

23

Fixed it. The Images produced by the ImageReader need to be closed, otherwise they quickly fill up memory.

@Override
onImageAvailable(ImageReader reader) {
    Image image = reader.acquireLatestImage();
    // Process the image
    image.close();
}

answered Jan 07 '16 at 22:09

brnby

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2

Thank you a lot for explanation! My App was freezing after getting 7 frames. – Volodymyr Kulyk Oct 10 '16 at 12:42
2

Thanks a lot. This API handles memory oddly. – jokeman Jan 09 '18 at 18:16
4

Thanks a lot. I have to close your IMAGE, not your READER – Maksim Dmitriev Nov 14 '18 at 10:40
Thanks a million. I spent a whole day, debugging my code thinking there is something wrong with my implementation. – Muhammad Babar Jan 31 '20 at 06:37

Camera2 ImageReader freezes repeating capture request

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