ioctl VIDIOC_G_DV_TIMINGS, VIDIOC_S_DV_TIMINGS &manvol; VIDIOC_G_DV_TIMINGS VIDIOC_S_DV_TIMINGS Get or set custom DV timings for input or output int ioctl int fd int request struct v4l2_dv_timings *argp fd &fd; request VIDIOC_G_DV_TIMINGS, VIDIOC_S_DV_TIMINGS argp To set custom DV timings for the input or output, applications use the VIDIOC_S_DV_TIMINGS ioctl and to get the current custom timings, applications use the VIDIOC_G_DV_TIMINGS ioctl. The detailed timing information is filled in using the structure &v4l2-dv-timings;. These ioctls take a pointer to the &v4l2-dv-timings; structure as argument. If the ioctl is not supported or the timing values are not correct, the driver returns &EINVAL;. &return-value; EINVAL This ioctl is not supported, or the VIDIOC_S_DV_TIMINGS parameter was unsuitable. EBUSY The device is busy and therefore can not change the timings. &cs-str; __u32 width Width of the active video in pixels __u32 height Height of the active video in lines __u32 interlaced Progressive (0) or interlaced (1) __u32 polarities This is a bit mask that defines polarities of sync signals. bit 0 (V4L2_DV_VSYNC_POS_POL) is for vertical sync polarity and bit 1 (V4L2_DV_HSYNC_POS_POL) is for horizontal sync polarity. If the bit is set (1) it is positive polarity and if is cleared (0), it is negative polarity. __u64 pixelclock Pixel clock in Hz. Ex. 74.25MHz->74250000 __u32 hfrontporch Horizontal front porch in pixels __u32 hsync Horizontal sync length in pixels __u32 hbackporch Horizontal back porch in pixels __u32 vfrontporch Vertical front porch in lines __u32 vsync Vertical sync length in lines __u32 vbackporch Vertical back porch in lines __u32 il_vfrontporch Vertical front porch in lines for bottom field of interlaced field formats __u32 il_vsync Vertical sync length in lines for bottom field of interlaced field formats __u32 il_vbackporch Vertical back porch in lines for bottom field of interlaced field formats &cs-str; __u32 type Type of DV timings as listed in . union &v4l2-bt-timings; bt Timings defined by BT.656/1120 specifications __u32 reserved[32] &cs-str; Timing type value Description V4L2_DV_BT_656_1120 0 BT.656/1120 timings &return-value;