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68 lines
2.5 KiB
68 lines
2.5 KiB
6 months ago
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/*
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* NAL helper functions for muxers
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVFORMAT_NAL_H
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#define AVFORMAT_NAL_H
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#include <stdint.h>
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#include "avio.h"
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typedef struct NALU {
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int offset;
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uint32_t size;
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} NALU;
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typedef struct NALUList {
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NALU *nalus;
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unsigned nalus_array_size;
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unsigned nb_nalus; ///< valid entries in nalus
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} NALUList;
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/* This function will parse the given annex B buffer and create
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* a NALUList from it. This list can be passed to ff_nal_units_write_list()
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* to write the access unit reformatted to mp4.
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*
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* @param list A NALUList. The list->nalus and list->nalus_array_size
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* must be valid when calling this function and may be updated.
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* nb_nalus is set by this function on success.
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* @param buf buffer containing annex B H.264 or H.265. Must be padded.
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* @param size size of buf, excluding padding.
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* @return < 0 on error, the size of the mp4-style packet on success.
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*/
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int ff_nal_units_create_list(NALUList *list, const uint8_t *buf, int size);
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/* Writes a NALUList to the specified AVIOContext. The list must originate
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* from ff_nal_units_create_list() with the same buf. */
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void ff_nal_units_write_list(const NALUList *list, AVIOContext *pb,
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const uint8_t *buf);
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const uint8_t *ff_nal_find_startcode(const uint8_t *p, const uint8_t *end);
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const uint8_t *ff_nal_mp4_find_startcode(const uint8_t *start,
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const uint8_t *end,
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int nal_length_size);
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int ff_nal_parse_units(AVIOContext *s, const uint8_t *buf, int size);
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int ff_nal_parse_units_buf(const uint8_t *buf_in, uint8_t **buf, int *size);
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uint8_t *ff_nal_unit_extract_rbsp(const uint8_t *src, uint32_t src_len,
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uint32_t *dst_len, int header_len);
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#endif /* AVFORMAT_NAL_H */
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