FFmpeg
libavcodec
evc_parse.h
Go to the documentation of this file.
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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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/**
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* @file
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* EVC decoder/parser shared code
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*/
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#ifndef AVCODEC_EVC_PARSE_H
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#define AVCODEC_EVC_PARSE_H
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#include <stdint.h>
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#include "
libavutil/intreadwrite.h
"
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#include "
libavutil/log.h
"
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#include "
evc.h
"
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#include "
evc_ps.h
"
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// The sturcture reflects Slice Header RBSP(raw byte sequence payload) layout
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// @see ISO_IEC_23094-1 section 7.3.2.6
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//
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// The following descriptors specify the parsing process of each element
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// u(n) - unsigned integer using n bits
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// ue(v) - unsigned integer 0-th order Exp_Golomb-coded syntax element with the left bit first
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// u(n) - unsigned integer using n bits.
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// When n is "v" in the syntax table, the number of bits varies in a manner dependent on the value of other syntax elements.
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typedef
struct
EVCParserSliceHeader
{
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uint8_t
slice_pic_parameter_set_id
;
// ue(v)
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uint8_t
single_tile_in_slice_flag
;
// u(1)
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uint8_t
first_tile_id
;
// u(v)
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uint8_t
arbitrary_slice_flag
;
// u(1)
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uint8_t
last_tile_id
;
// u(v)
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uint32_t
num_remaining_tiles_in_slice_minus1
;
// ue(v)
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uint16_t
delta_tile_id_minus1
[
EVC_MAX_TILE_ROWS
*
EVC_MAX_TILE_COLUMNS
];
// ue(v)
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uint8_t
slice_type
;
// ue(v)
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uint8_t
no_output_of_prior_pics_flag
;
// u(1)
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uint8_t
mmvd_group_enable_flag
;
// u(1)
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uint8_t
slice_alf_enabled_flag
;
// u(1)
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uint8_t
slice_alf_luma_aps_id
;
// u(5)
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uint8_t
slice_alf_map_flag
;
// u(1)
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uint8_t
slice_alf_chroma_idc
;
// u(2)
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uint8_t
slice_alf_chroma_aps_id
;
// u(5)
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uint8_t
slice_alf_chroma_map_flag
;
// u(1)
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uint8_t
slice_alf_chroma2_aps_id
;
// u(5)
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uint8_t
slice_alf_chroma2_map_flag
;
// u(1)
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uint16_t
slice_pic_order_cnt_lsb
;
// u(v)
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// @note
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// Currently the structure does not reflect the entire Slice Header RBSP layout.
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// It contains only the fields that are necessary to read from the NAL unit all the values
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// necessary for the correct initialization of the AVCodecContext structure.
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// @note
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// If necessary, add the missing fields to the structure to reflect
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// the contents of the entire NAL unit of the SPS type
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}
EVCParserSliceHeader
;
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// picture order count of the current picture
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typedef
struct
EVCParserPoc
{
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int
PicOrderCntVal
;
// current picture order count value
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int
prevPicOrderCntVal
;
// the picture order count of the previous Tid0 picture
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int
DocOffset
;
// the decoding order count of the previous picture
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}
EVCParserPoc
;
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static
inline
uint32_t
evc_read_nal_unit_length
(
const
uint8_t *
bits
,
int
bits_size
,
void
*logctx)
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{
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uint32_t nalu_len = 0;
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if
(
bits_size
<
EVC_NALU_LENGTH_PREFIX_SIZE
) {
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av_log
(logctx,
AV_LOG_ERROR
,
"Can't read NAL unit length\n"
);
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return
0;
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}
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nalu_len =
AV_RB32
(
bits
);
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return
nalu_len;
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}
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int
ff_evc_parse_slice_header
(
GetBitContext
*gb,
EVCParserSliceHeader
*sh,
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const
EVCParamSets
*ps,
enum
EVCNALUnitType
nalu_type);
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// POC (picture order count of the current picture) derivation
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// @see ISO/IEC 23094-1:2020(E) 8.3.1 Decoding process for picture order count
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int
ff_evc_derive_poc
(
const
EVCParamSets
*ps,
const
EVCParserSliceHeader
*sh,
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EVCParserPoc
*poc,
enum
EVCNALUnitType
nalu_type,
int
tid);
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#endif
/* AVCODEC_EVC_PARSE_H */
EVCParserPoc::PicOrderCntVal
int PicOrderCntVal
Definition:
evc_parse.h:78
EVC_MAX_TILE_COLUMNS
@ EVC_MAX_TILE_COLUMNS
Definition:
evc.h:140
EVCParserSliceHeader::single_tile_in_slice_flag
uint8_t single_tile_in_slice_flag
Definition:
evc_parse.h:44
EVCParamSets
Definition:
evc_ps.h:211
evc_ps.h
EVCParserSliceHeader::slice_alf_luma_aps_id
uint8_t slice_alf_luma_aps_id
Definition:
evc_parse.h:56
GetBitContext
Definition:
get_bits.h:108
EVCParserPoc::DocOffset
int DocOffset
Definition:
evc_parse.h:80
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition:
log.h:209
EVCParserSliceHeader::no_output_of_prior_pics_flag
uint8_t no_output_of_prior_pics_flag
Definition:
evc_parse.h:52
EVCParserSliceHeader::slice_pic_order_cnt_lsb
uint16_t slice_pic_order_cnt_lsb
Definition:
evc_parse.h:63
intreadwrite.h
bits
uint8_t bits
Definition:
vp3data.h:128
EVCParserSliceHeader::slice_alf_chroma2_map_flag
uint8_t slice_alf_chroma2_map_flag
Definition:
evc_parse.h:62
ff_evc_parse_slice_header
int ff_evc_parse_slice_header(GetBitContext *gb, EVCParserSliceHeader *sh, const EVCParamSets *ps, enum EVCNALUnitType nalu_type)
Definition:
evc_parse.c:24
EVCParserSliceHeader::slice_alf_enabled_flag
uint8_t slice_alf_enabled_flag
Definition:
evc_parse.h:54
EVCParserSliceHeader::slice_alf_map_flag
uint8_t slice_alf_map_flag
Definition:
evc_parse.h:57
EVCParserSliceHeader::last_tile_id
uint8_t last_tile_id
Definition:
evc_parse.h:47
EVCParserSliceHeader::slice_type
uint8_t slice_type
Definition:
evc_parse.h:51
EVCParserSliceHeader::slice_pic_parameter_set_id
uint8_t slice_pic_parameter_set_id
Definition:
evc_parse.h:43
EVCParserSliceHeader
Definition:
evc_parse.h:42
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
EVCNALUnitType
EVCNALUnitType
Definition:
evc.h:33
EVCParserSliceHeader::slice_alf_chroma_idc
uint8_t slice_alf_chroma_idc
Definition:
evc_parse.h:58
EVCParserSliceHeader::arbitrary_slice_flag
uint8_t arbitrary_slice_flag
Definition:
evc_parse.h:46
EVC_NALU_LENGTH_PREFIX_SIZE
#define EVC_NALU_LENGTH_PREFIX_SIZE
Definition:
evc.h:26
EVCParserSliceHeader::first_tile_id
uint8_t first_tile_id
Definition:
evc_parse.h:45
log.h
EVCParserSliceHeader::num_remaining_tiles_in_slice_minus1
uint32_t num_remaining_tiles_in_slice_minus1
Definition:
evc_parse.h:48
EVC_MAX_TILE_ROWS
@ EVC_MAX_TILE_ROWS
Definition:
evc.h:138
EVCParserSliceHeader::slice_alf_chroma_map_flag
uint8_t slice_alf_chroma_map_flag
Definition:
evc_parse.h:60
EVCParserSliceHeader::mmvd_group_enable_flag
uint8_t mmvd_group_enable_flag
Definition:
evc_parse.h:53
EVCParserPoc::prevPicOrderCntVal
int prevPicOrderCntVal
Definition:
evc_parse.h:79
bits_size
#define bits_size
Definition:
bitstream.h:113
evc_read_nal_unit_length
static uint32_t evc_read_nal_unit_length(const uint8_t *bits, int bits_size, void *logctx)
Definition:
evc_parse.h:83
EVCParserSliceHeader::slice_alf_chroma_aps_id
uint8_t slice_alf_chroma_aps_id
Definition:
evc_parse.h:59
EVCParserSliceHeader::delta_tile_id_minus1
uint16_t delta_tile_id_minus1[EVC_MAX_TILE_ROWS *EVC_MAX_TILE_COLUMNS]
Definition:
evc_parse.h:49
EVCParserPoc
Definition:
evc_parse.h:77
evc.h
av_log
#define av_log(a,...)
Definition:
tableprint_vlc.h:27
ff_evc_derive_poc
int ff_evc_derive_poc(const EVCParamSets *ps, const EVCParserSliceHeader *sh, EVCParserPoc *poc, enum EVCNALUnitType nalu_type, int tid)
Definition:
evc_parse.c:140
EVCParserSliceHeader::slice_alf_chroma2_aps_id
uint8_t slice_alf_chroma2_aps_id
Definition:
evc_parse.h:61
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