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libavformat
evc.h
Go to the documentation of this file.
1
/*
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* EVC helper functions for muxers
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* Copyright (c) 2022 Dawid Kozinski <d.kozinski@samsung.com>
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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
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.
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*
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* 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.
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*
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* 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
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*/
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22
#ifndef AVFORMAT_EVC_H
23
#define AVFORMAT_EVC_H
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25
#include <stdint.h>
26
27
#include "
libavutil/intreadwrite.h
"
28
#include "
libavutil/rational.h
"
29
#include "
libavcodec/evc.h
"
30
#include "
avio.h
"
31
32
static
inline
int
evc_get_nalu_type
(
const
uint8_t *p,
int
bits_size
)
33
{
34
int
unit_type_plus1 = 0;
35
36
if
(
bits_size
>=
EVC_NALU_HEADER_SIZE
) {
37
// forbidden_zero_bit
38
if
((p[0] & 0x80) != 0)
// Cannot get bitstream information. Malformed bitstream.
39
return
-1;
40
41
// nal_unit_type
42
unit_type_plus1 = (p[0] >> 1) & 0x3F;
43
}
44
45
return
unit_type_plus1 - 1;
46
}
47
48
static
inline
uint32_t
evc_read_nal_unit_length
(
const
uint8_t *
bits
,
int
bits_size
)
49
{
50
if
(
bits_size
>=
EVC_NALU_LENGTH_PREFIX_SIZE
)
51
return
AV_RB32
(
bits
);
52
53
return
0;
54
}
55
56
/**
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* Writes EVC sample metadata to the provided AVIOContext.
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*
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* @param pb pointer to the AVIOContext where the evc sample metadata shall be written
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* @param buf input data buffer
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* @param size size in bytes of the input data buffer
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* @param ps_array_completeness @see ISO/IEC 14496-15:2021 Coding of audio-visual objects - Part 15: section 12.3.3.3
63
*
64
* @return 0 in case of success, a negative error code in case of failure
65
*/
66
int
ff_isom_write_evcc
(
AVIOContext
*pb,
const
uint8_t *
data
,
67
int
size
,
int
ps_array_completeness);
68
69
#endif // AVFORMAT_EVC_H
rational.h
data
const char data[16]
Definition:
mxf.c:149
evc_get_nalu_type
static int evc_get_nalu_type(const uint8_t *p, int bits_size)
Definition:
evc.h:32
EVC_NALU_HEADER_SIZE
#define EVC_NALU_HEADER_SIZE
Definition:
evc.h:27
intreadwrite.h
bits
uint8_t bits
Definition:
vp3data.h:128
AVIOContext
Bytestream IO Context.
Definition:
avio.h:160
size
int size
Definition:
twinvq_data.h:10344
avio.h
AV_RB32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition:
bytestream.h:96
EVC_NALU_LENGTH_PREFIX_SIZE
#define EVC_NALU_LENGTH_PREFIX_SIZE
Definition:
evc.h:26
ff_isom_write_evcc
int ff_isom_write_evcc(AVIOContext *pb, const uint8_t *data, int size, int ps_array_completeness)
Writes EVC sample metadata to the provided AVIOContext.
Definition:
evc.c:298
bits_size
#define bits_size
Definition:
bitstream.h:113
evc.h
evc_read_nal_unit_length
static uint32_t evc_read_nal_unit_length(const uint8_t *bits, int bits_size)
Definition:
evc.h:48
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