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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