v4l2_detect_gtf — detect if the given timings follow the GTF standard
bool v4l2_detect_gtf ( | unsigned frame_height, |
| unsigned hfreq, | |
| unsigned vsync, | |
| u32 polarities, | |
| bool interlaced, | |
| struct v4l2_fract aspect, | |
struct v4l2_dv_timings * fmt); |
frame_heightthe total height of the frame (including blanking) in lines.
hfreqthe horizontal frequency in Hz.
vsyncthe height of the vertical sync in lines.
polaritiesthe horizontal and vertical polarities (same as struct v4l2_bt_timings polarities).
interlacedif this flag is true, it indicates interlaced format
aspectpreferred aspect ratio. GTF has no method of determining the aspect ratio in order to derive the image width from the image height, so it has to be passed explicitly. Usually the native screen aspect ratio is used for this. If it is not filled in correctly, then 16:9 will be assumed.
fmtthe resulting timings.