/* SPDX-License-Identifier: GPL-2.0 */ /* * Copyright (C) 2019-2020 Pengutronix, Michael Tretter <kernel@pengutronix.de> */ #ifndef __NAL_RBSP_H__ #define __NAL_RBSP_H__ #include <linux/kernel.h> #include <linux/types.h> struct rbsp; struct nal_rbsp_ops { int (*rbsp_bit)(struct rbsp *rbsp, int *val); int (*rbsp_bits)(struct rbsp *rbsp, int n, unsigned int *val); int (*rbsp_uev)(struct rbsp *rbsp, unsigned int *val); int (*rbsp_sev)(struct rbsp *rbsp, int *val); }; /** * struct rbsp - State object for handling a raw byte sequence payload * @data: pointer to the data of the rbsp * @size: maximum size of the data of the rbsp * @pos: current bit position inside the rbsp * @num_consecutive_zeros: number of zeros before @pos * @ops: per datatype functions for interacting with the rbsp * @error: an error occurred while handling the rbsp * * This struct is passed around the various parsing functions and tracks the * current position within the raw byte sequence payload. * * The @ops field allows to separate the operation, i.e., reading/writing a * value from/to that rbsp, from the structure of the NAL unit. This allows to * have a single function for iterating the NAL unit, while @ops has function * pointers for handling each type in the rbsp. */ struct rbsp { u8 *data; size_t size; unsigned int pos; unsigned int num_consecutive_zeros; struct nal_rbsp_ops *ops; int error; }; extern struct nal_rbsp_ops write; extern struct nal_rbsp_ops read; void rbsp_init(struct rbsp *rbsp, void *addr, size_t size, struct nal_rbsp_ops *ops); void rbsp_unsupported(struct rbsp *rbsp); void rbsp_bit(struct rbsp *rbsp, int *value); void rbsp_bits(struct rbsp *rbsp, int n, int *value); void rbsp_uev(struct rbsp *rbsp, unsigned int *value); void rbsp_sev(struct rbsp *rbsp, int *value); void rbsp_trailing_bits(struct rbsp *rbsp); #endif /* __NAL_RBSP_H__ */