v4l2_jpegcompression 1427 include/linux/videodev2.h #define VIDIOC_G_JPEGCOMP	 _IOR('V', 61, struct v4l2_jpegcompression)
v4l2_jpegcompression 1428 include/linux/videodev2.h #define VIDIOC_S_JPEGCOMP	 _IOW('V', 62, struct v4l2_jpegcompression)
v4l2_jpegcompression  189 include/media/v4l2-ioctl.h 					struct v4l2_jpegcompression *a);
v4l2_jpegcompression  191 include/media/v4l2-ioctl.h 					struct v4l2_jpegcompression *a);