[android-developers] Re: can not set preview buffer format to nv21 on nexus 4

I think you got a bit confused. Use NV21 for setPreviewFormat (which is YUV420sp), and Jpeg for setPictureFormat.

If you want to process RGB pixels on the "onPictureTaken" callback which is when a picture is taken, then use the next line:

public void onPictureTaken(final byte[] data, final Camera camera)

{

Bitmap bitmap = BitmapFactory.decodeByteArray(jpegData, 0, jpegData.length);

        ....

}

If instead you want to process the preview frames, then you need to find a converter for YUV42sp to RGB, there are many around if you google a bit.

On Saturday, March 16, 2013 5:45:08 AM UTC+1, Qianqian Fang wrote:

Based on the help for getSupportedPreviewFormats [1], NV21 should be
always supported. However, when I run

camParam = mCamera.getParameters();
camParam.setPictureFormat(ImageFormat.NV21);
mCamera.setParameters(camParam);

on my nexus 4, I get an error "setParameters failed". The only way to
get through is to use ImageFormat.JPEG, which is the default. is nv21
supported on nexus 4?

if I can not set format to nv21, how can I read the RGB values per
pixel with an JPEG preview buffer format?

thanks

Qianqian


[1] http://developer.android.com/reference/android/hardware/Camera.Parameters.html#getSupportedPreviewFormats()

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