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