1 /*
2  * AVC helper functions for muxers
3  * Copyright (c) 2008 Aurelien Jacobs <aurel@gnuage.org>
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #ifndef AVFORMAT_AVC_H
23 #define AVFORMAT_AVC_H
24 
25 #include <stdint.h>
26 #include "libavutil/rational.h"
27 #include "avio.h"
28 
29 typedef struct NALU {
30     int offset;
31     uint32_t size;
32 } NALU;
33 
34 typedef struct NALUList {
35     NALU *nalus;
36     unsigned nalus_array_size;
37     unsigned nb_nalus;          ///< valid entries in nalus
38 } NALUList;
39 
40 /* This function will parse the given annex B buffer and create
41  * a NALUList from it. This list can be passed to ff_nal_units_write_list()
42  * to write the access unit reformatted to mp4.
43  *
44  * @param list A NALUList. The list->nalus and list->nalus_array_size
45  *             must be valid when calling this function and may be updated.
46  *             nb_nalus is set by this function on success.
47  * @param buf  buffer containing annex B H.264 or H.265. Must be padded.
48  * @param size size of buf, excluding padding.
49  * @return < 0 on error, the size of the mp4-style packet on success.
50  */
51 int ff_nal_units_create_list(NALUList *list, const uint8_t *buf, int size);
52 
53 /* Writes a NALUList to the specified AVIOContext. The list must originate
54  * from ff_nal_units_create_list() with the same buf. */
55 void ff_nal_units_write_list(const NALUList *list, AVIOContext *pb,
56                              const uint8_t *buf);
57 
58 int ff_avc_parse_nal_units(AVIOContext *s, const uint8_t *buf, int size);
59 int ff_avc_parse_nal_units_buf(const uint8_t *buf_in, uint8_t **buf, int *size);
60 int ff_isom_write_avcc(AVIOContext *pb, const uint8_t *data, int len);
61 const uint8_t *ff_avc_find_startcode(const uint8_t *p, const uint8_t *end);
62 int ff_avc_write_annexb_extradata(const uint8_t *in, uint8_t **buf, int *size);
63 const uint8_t *ff_avc_mp4_find_startcode(const uint8_t *start,
64                                          const uint8_t *end,
65                                          int nal_length_size);
66 uint8_t *ff_nal_unit_extract_rbsp(const uint8_t *src, uint32_t src_len,
67                                   uint32_t *dst_len, int header_len);
68 
69 typedef struct {
70     uint8_t id;
71     uint8_t profile_idc;
72     uint8_t level_idc;
73     uint8_t constraint_set_flags;
74     uint8_t chroma_format_idc;
75     uint8_t bit_depth_luma;
76     uint8_t bit_depth_chroma;
77     uint8_t frame_mbs_only_flag;
78     AVRational sar;
79 } H264SPS;
80 
81 int ff_avc_decode_sps(H264SPS *sps, const uint8_t *buf, int buf_size);
82 
83 #endif /* AVFORMAT_AVC_H */
84