ioctl VIDIOC_SUBDEV_ENUM_FRAME_SIZE &manvol; VIDIOC_SUBDEV_ENUM_FRAME_SIZE Enumerate media bus frame sizes int ioctl int fd int request struct v4l2_subdev_frame_size_enum * argp fd &fd; request VIDIOC_SUBDEV_ENUM_FRAME_SIZE argp This is an experimental interface and may change in the future. This ioctl allows applications to enumerate all frame sizes supported by a sub-device on the given pad for the given media bus format. Supported formats can be retrieved with the &VIDIOC-SUBDEV-ENUM-MBUS-CODE; ioctl. To enumerate frame sizes applications initialize the pad, which , code and index fields of the &v4l2-subdev-mbus-code-enum; and call the VIDIOC_SUBDEV_ENUM_FRAME_SIZE ioctl with a pointer to the structure. Drivers fill the minimum and maximum frame sizes or return an &EINVAL; if one of the input parameters is invalid. Sub-devices that only support discrete frame sizes (such as most sensors) will return one or more frame sizes with identical minimum and maximum values. Not all possible sizes in given [minimum, maximum] ranges need to be supported. For instance, a scaler that uses a fixed-point scaling ratio might not be able to produce every frame size between the minimum and maximum values. Applications must use the &VIDIOC-SUBDEV-S-FMT; ioctl to try the sub-device for an exact supported frame size. Available frame sizes may depend on the current 'try' formats at other pads of the sub-device, as well as on the current active links and the current values of V4L2 controls. See &VIDIOC-SUBDEV-G-FMT; for more information about try formats. &cs-str; __u32 index Number of the format in the enumeration, set by the application. __u32 pad Pad number as reported by the media controller API. __u32 code The media bus format code, as defined in . __u32 min_width Minimum frame width, in pixels. __u32 max_width Maximum frame width, in pixels. __u32 min_height Minimum frame height, in pixels. __u32 max_height Maximum frame height, in pixels. __u32 which Frame sizes to be enumerated, from &v4l2-subdev-format-whence;. __u32 reserved[8] Reserved for future extensions. Applications and drivers must set the array to zero. &return-value; EINVAL The &v4l2-subdev-frame-size-enum; pad references a non-existing pad, the code is invalid for the given pad or the index field is out of bounds.