include/uapi/linux/v4l2-controls.h

Source file repositories/reference/linux-study-clean/include/uapi/linux/v4l2-controls.h

File Facts

System
Linux kernel
Corpus path
include/uapi/linux/v4l2-controls.h
Extension
.h
Size
153316 bytes
Lines
3589
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct v4l2_ctrl_h264_sps {
	__u8 profile_idc;
	__u8 constraint_set_flags;
	__u8 level_idc;
	__u8 seq_parameter_set_id;
	__u8 chroma_format_idc;
	__u8 bit_depth_luma_minus8;
	__u8 bit_depth_chroma_minus8;
	__u8 log2_max_frame_num_minus4;
	__u8 pic_order_cnt_type;
	__u8 log2_max_pic_order_cnt_lsb_minus4;
	__u8 max_num_ref_frames;
	__u8 num_ref_frames_in_pic_order_cnt_cycle;
	__s32 offset_for_ref_frame[255];
	__s32 offset_for_non_ref_pic;
	__s32 offset_for_top_to_bottom_field;
	__u16 pic_width_in_mbs_minus1;
	__u16 pic_height_in_map_units_minus1;
	__u32 flags;
};

#define V4L2_H264_PPS_FLAG_ENTROPY_CODING_MODE				0x0001
#define V4L2_H264_PPS_FLAG_BOTTOM_FIELD_PIC_ORDER_IN_FRAME_PRESENT	0x0002
#define V4L2_H264_PPS_FLAG_WEIGHTED_PRED				0x0004
#define V4L2_H264_PPS_FLAG_DEBLOCKING_FILTER_CONTROL_PRESENT		0x0008
#define V4L2_H264_PPS_FLAG_CONSTRAINED_INTRA_PRED			0x0010
#define V4L2_H264_PPS_FLAG_REDUNDANT_PIC_CNT_PRESENT			0x0020
#define V4L2_H264_PPS_FLAG_TRANSFORM_8X8_MODE				0x0040
#define V4L2_H264_PPS_FLAG_SCALING_MATRIX_PRESENT			0x0080

#define V4L2_CID_STATELESS_H264_PPS		(V4L2_CID_CODEC_STATELESS_BASE + 3)
/**
 * struct v4l2_ctrl_h264_pps - H264 picture parameter set
 *
 * Except where noted, all the members on this picture parameter set
 * structure match the picture parameter set syntax as specified
 * by the H264 specification.
 *
 * In particular, V4L2_H264_PPS_FLAG_SCALING_MATRIX_PRESENT flag
 * has a specific meaning. This flag should be set if a non-flat
 * scaling matrix applies to the picture. In this case, applications
 * are expected to use V4L2_CID_STATELESS_H264_SCALING_MATRIX,
 * to pass the values of the non-flat matrices.
 *
 * @pic_parameter_set_id: see H264 specification.
 * @seq_parameter_set_id: see H264 specification.
 * @num_slice_groups_minus1: see H264 specification.
 * @num_ref_idx_l0_default_active_minus1: see H264 specification.
 * @num_ref_idx_l1_default_active_minus1: see H264 specification.
 * @weighted_bipred_idc: see H264 specification.
 * @pic_init_qp_minus26: see H264 specification.
 * @pic_init_qs_minus26: see H264 specification.
 * @chroma_qp_index_offset: see H264 specification.
 * @second_chroma_qp_index_offset: see H264 specification.
 * @flags: see V4L2_H264_PPS_FLAG_{}.
 */
struct v4l2_ctrl_h264_pps {
	__u8 pic_parameter_set_id;
	__u8 seq_parameter_set_id;
	__u8 num_slice_groups_minus1;
	__u8 num_ref_idx_l0_default_active_minus1;
	__u8 num_ref_idx_l1_default_active_minus1;
	__u8 weighted_bipred_idc;
	__s8 pic_init_qp_minus26;
	__s8 pic_init_qs_minus26;
	__s8 chroma_qp_index_offset;
	__s8 second_chroma_qp_index_offset;
	__u16 flags;
};

#define V4L2_CID_STATELESS_H264_SCALING_MATRIX	(V4L2_CID_CODEC_STATELESS_BASE + 4)
/**
 * struct v4l2_ctrl_h264_scaling_matrix - H264 scaling matrices
 *
 * @scaling_list_4x4: scaling matrix after applying the inverse
 * scanning process. Expected list order is Intra Y, Intra Cb,
 * Intra Cr, Inter Y, Inter Cb, Inter Cr. The values on each
 * scaling list are expected in raster scan order.
 * @scaling_list_8x8: scaling matrix after applying the inverse
 * scanning process. Expected list order is Intra Y, Inter Y,
 * Intra Cb, Inter Cb, Intra Cr, Inter Cr. The values on each
 * scaling list are expected in raster scan order.
 *
 * Note that the list order is different for the 4x4 and 8x8
 * matrices as per the H264 specification, see table 7-2 "Assignment
 * of mnemonic names to scaling list indices and specification of
 * fall-back rule".
 */
struct v4l2_ctrl_h264_scaling_matrix {
	__u8 scaling_list_4x4[6][16];

Annotation

Implementation Notes