7.57. ioctl VIDIOC_SUBDEV_ENUM_MBUS_CODE¶
7.57.1. Name¶
VIDIOC_SUBDEV_ENUM_MBUS_CODE - Enumerate media bus formats
7.57.2. Synopsis¶
-
VIDIOC_SUBDEV_ENUM_MBUS_CODE¶
int ioctl(int fd, VIDIOC_SUBDEV_ENUM_MBUS_CODE, struct v4l2_subdev_mbus_code_enum * argp)
7.57.3. Arguments¶
fdFile descriptor returned by
open().argpPointer to struct
v4l2_subdev_mbus_code_enum.
7.57.4. Description¶
To enumerate media bus formats available at a given sub-device pad
applications initialize the pad, which and index fields of
struct
v4l2_subdev_mbus_code_enum and
call the ioctl VIDIOC_SUBDEV_ENUM_MBUS_CODE ioctl with a pointer to this
structure. Drivers fill the rest of the structure or return an EINVAL
error code if either the pad or index are invalid. All media bus
formats are enumerable by beginning at index zero and incrementing by
one until EINVAL is returned.
Available media bus formats may depend on the current ‘try’ formats at other pads of the sub-device, as well as on the current active links. See ioctl VIDIOC_SUBDEV_G_FMT, VIDIOC_SUBDEV_S_FMT for more information about the try formats.
-
type
v4l2_subdev_mbus_code_enum¶
__u32 |
|
Pad number as reported by the media controller API. |
__u32 |
|
Number of the format in the enumeration, set by the application. |
__u32 |
|
The media bus format code, as defined in Media Bus Formats. |
__u32 |
|
Media bus format codes to be enumerated, from enum v4l2_subdev_format_whence. |
__u32 |
|
|
__u32 |
|
Reserved for future extensions. Applications and drivers must set the array to zero. |
V4L2_SUBDEV_MBUS_CODE_CSC_COLORSPACE |
0x00000001 |
The driver allows the application to try to change the default colorspace encoding. The application can ask to configure the colorspace of the subdevice when calling the VIDIOC_SUBDEV_S_FMT ioctl with V4L2_MBUS_FRAMEFMT_SET_CSC set. See Media Bus Formats on how to do this. |
V4L2_SUBDEV_MBUS_CODE_CSC_XFER_FUNC |
0x00000002 |
The driver allows the application to try to change the default transform function. The application can ask to configure the transform function of the subdevice when calling the VIDIOC_SUBDEV_S_FMT ioctl with V4L2_MBUS_FRAMEFMT_SET_CSC set. See Media Bus Formats on how to do this. |
V4L2_SUBDEV_MBUS_CODE_CSC_YCBCR_ENC |
0x00000004 |
The driver allows the application to try to change the default Y’CbCr encoding. The application can ask to configure the Y’CbCr encoding of the subdevice when calling the VIDIOC_SUBDEV_S_FMT ioctl with V4L2_MBUS_FRAMEFMT_SET_CSC set. See Media Bus Formats on how to do this. |
V4L2_SUBDEV_MBUS_CODE_CSC_HSV_ENC |
0x00000004 |
The driver allows the application to try to change the default HSV encoding. The application can ask to configure the HSV encoding of the subdevice when calling the VIDIOC_SUBDEV_S_FMT ioctl with V4L2_MBUS_FRAMEFMT_SET_CSC set. See Media Bus Formats on how to do this. |
V4L2_SUBDEV_MBUS_CODE_CSC_QUANTIZATION |
0x00000008 |
The driver allows the application to try to change the default quantization. The application can ask to configure the quantization of the subdevice when calling the VIDIOC_SUBDEV_S_FMT ioctl with V4L2_MBUS_FRAMEFMT_SET_CSC set. See Media Bus Formats on how to do this. |
7.57.5. Return Value¶
On success 0 is returned, on error -1 and the errno variable is set
appropriately. The generic error codes are described at the
Generic Error Codes chapter.
- EINVAL
The struct
v4l2_subdev_mbus_code_enumpadreferences a non-existing pad, or theindexfield is out of bounds.