From c61bd6a0e2a92009f3879457eeec75b5ad102303 Mon Sep 17 00:00:00 2001 From: Hans Verkuil Date: Fri, 10 Aug 2012 06:11:12 -0300 Subject: [media] v4l2-common: add CVT and GTF detection functions These two helper functions detect whether the analog video timings detected by the video receiver match the VESA CVT or GTF standards. They basically do the inverse of the CVT and GTF modeline calculations. This patch also adds a helper function that will determine the aspect ratio based on the provided EDID values. This aspect ratio can be given to the GTF helper function. Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- include/media/v4l2-common.h | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'include/media/v4l2-common.h') diff --git a/include/media/v4l2-common.h b/include/media/v4l2-common.h index 447f4b6b716..1a0b2db4c5d 100644 --- a/include/media/v4l2-common.h +++ b/include/media/v4l2-common.h @@ -216,4 +216,13 @@ bool v4l_match_dv_timings(const struct v4l2_dv_timings *t1, const struct v4l2_dv_timings *t2, unsigned pclock_delta); +bool v4l2_detect_cvt(unsigned frame_height, unsigned hfreq, unsigned vsync, + u32 polarities, struct v4l2_dv_timings *fmt); + +bool v4l2_detect_gtf(unsigned frame_height, unsigned hfreq, unsigned vsync, + u32 polarities, struct v4l2_fract aspect, + struct v4l2_dv_timings *fmt); + +struct v4l2_fract v4l2_calc_aspect_ratio(u8 hor_landscape, u8 vert_portrait); + #endif /* V4L2_COMMON_H_ */ -- cgit v1.2.3-70-g09d2