#include <errno.h>
#include <stdint.h>
#include <string.h>
#include "libavutil/attributes.h"
#include "libavutil/error.h"
#include "libavutil/intmath.h"
#include "libavutil/macros.h"
#include "libavutil/mem.h"
#include "libavutil/pixfmt.h"
#include "bytestream.h"
#include "codec_id.h"
#include "get_bits.h"
#include "jpegxl.h"
#include "jpegxl_parse.h"
#include "parser.h"
#include "vlc.h"

Data Structures
struct	JXLHybridUintConf

struct	JXLSymbolDistribution

struct	JXLDistributionBundle

struct	JXLEntropyDecoder

struct	JXLFrame

struct	JXLCodestream

struct	JXLParseContext

Macros
#define	UNCHECKED_BITSTREAM_READER 0
	JPEG XL parser Copyright (c) 2023 Leo Izen leo.i.nosp@m.zen@.nosp@m.gmail.nosp@m..com More...

#define	BITSTREAM_READER_LE

#define	JXL_FLAG_NOISE 1

#define	JXL_FLAG_PATCHES 2

#define	JXL_FLAG_SPLINES 16

#define	JXL_FLAG_USE_LF_FRAME 32

#define	JXL_FLAG_SKIP_ADAPTIVE_LF_SMOOTH 128

#define	MAX_PREFIX_ALPHABET_SIZE (1u << 15)

#define	clog1p(x) (ff_log2(x) + !!(x))

#define	unpack_signed(x) (((x) & 1 ? -(x)-1 : (x))/2)

#define	div_ceil(x, y) (((x) - 1) / (y) + 1)

#define	vlm(a, b) {.sym = (a), .len = (b)}

Functions
static av_always_inline uint8_t	jxl_u8 (GetBitContext *gb)
	Read a variable-length 8-bit integer. More...

static av_always_inline uint32_t	jxl_u32 (GetBitContext *gb, uint32_t c0, uint32_t c1, uint32_t c2, uint32_t c3, uint32_t u0, uint32_t u1, uint32_t u2, uint32_t u3)

static uint64_t	jxl_u64 (GetBitContext *gb)

static int	read_hybrid_uint_conf (GetBitContext gb, JXLHybridUintConf conf, int log_alphabet_size)

static int	read_hybrid_uint (GetBitContext gb, const JXLHybridUintConf conf, uint32_t token, uint32_t *hybrid_uint)

static uint32_t	read_prefix_symbol (GetBitContext gb, const JXLSymbolDistribution dist)

static uint32_t	read_ans_symbol (GetBitContext gb, JXLEntropyDecoder dec, const JXLSymbolDistribution *dist)

static int	decode_hybrid_varlen_uint (GetBitContext gb, JXLEntropyDecoder dec, const JXLDistributionBundle bundle, uint32_t context, uint32_t hybrid_uint)

static int	populate_distribution (GetBitContext gb, JXLSymbolDistribution dist, int log_alphabet_size)

static void	dist_bundle_close (JXLDistributionBundle *bundle)

static int	read_distribution_bundle (GetBitContext gb, JXLEntropyDecoder dec, JXLDistributionBundle *bundle, int num_dist, int disallow_lz77)

static int	read_dist_clustering (GetBitContext gb, JXLEntropyDecoder dec, JXLDistributionBundle *bundle)

static int	gen_alias_map (JXLEntropyDecoder dec, JXLSymbolDistribution dist, int log_alphabet_size)

static int	read_simple_vlc_prefix (GetBitContext gb, JXLEntropyDecoder dec, JXLSymbolDistribution *dist)

static int	read_vlc_prefix (GetBitContext gb, JXLEntropyDecoder dec, JXLSymbolDistribution *dist)

static void	entropy_decoder_close (JXLEntropyDecoder *dec)

static int	entropy_decoder_init (void avctx, GetBitContext gb, JXLEntropyDecoder *dec, int num_dist)

static int64_t	entropy_decoder_read_symbol (GetBitContext gb, JXLEntropyDecoder dec, uint32_t context)

static uint32_t	icc_context (uint64_t i, uint32_t b1, uint32_t b2)

static uint32_t	toc_context (uint32_t x)

static void	populate_fields (AVCodecParserContext s, AVCodecContext avctx, const FFJXLMetadata *meta)

static int	skip_icc_profile (void avctx, JXLParseContext ctx, GetBitContext *gb)

static int	skip_extensions (GetBitContext *gb)

static int	parse_frame_header (void avctx, JXLParseContext ctx, GetBitContext *gb)

static int	skip_boxes (JXLParseContext ctx, const uint8_t buf, int buf_size)

static int	try_parse (AVCodecParserContext s, AVCodecContext avctx, JXLParseContext ctx, const uint8_t buf, int buf_size)

static int	jpegxl_parse (AVCodecParserContext s, AVCodecContext avctx, const uint8_t *poutbuf, int poutbuf_size, const uint8_t *buf, int buf_size)

Variables
static const VLCElem	level0_table [16]

static const VLCElem	dist_prefix_table [128]

static const uint8_t	prefix_codelen_map [18]

const AVCodecParser	ff_jpegxl_parser

Macro Definition Documentation

◆ UNCHECKED_BITSTREAM_READER

#define UNCHECKED_BITSTREAM_READER 0

This file is part of FFmpeg.

FFmpeg is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.

FFmpeg is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with FFmpeg; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

Definition at line 35 of file jpegxl_parser.c.

◆ BITSTREAM_READER_LE

#define BITSTREAM_READER_LE

Definition at line 36 of file jpegxl_parser.c.

◆ JXL_FLAG_NOISE

#define JXL_FLAG_NOISE 1

Definition at line 43 of file jpegxl_parser.c.

◆ JXL_FLAG_PATCHES

#define JXL_FLAG_PATCHES 2

Definition at line 44 of file jpegxl_parser.c.

◆ JXL_FLAG_SPLINES

#define JXL_FLAG_SPLINES 16

Definition at line 45 of file jpegxl_parser.c.

◆ JXL_FLAG_USE_LF_FRAME

#define JXL_FLAG_USE_LF_FRAME 32

Definition at line 46 of file jpegxl_parser.c.

◆ JXL_FLAG_SKIP_ADAPTIVE_LF_SMOOTH

#define JXL_FLAG_SKIP_ADAPTIVE_LF_SMOOTH 128

Definition at line 47 of file jpegxl_parser.c.

◆ MAX_PREFIX_ALPHABET_SIZE

#define MAX_PREFIX_ALPHABET_SIZE (1u << 15)

Definition at line 49 of file jpegxl_parser.c.

◆ clog1p

#define clog1p ( x ) (ff_log2(x) + !!(x))

Definition at line 51 of file jpegxl_parser.c.

◆ unpack_signed

#define unpack_signed ( x ) (((x) & 1 ? -(x)-1 : (x))/2)

Definition at line 52 of file jpegxl_parser.c.

◆ div_ceil

#define div_ceil	(	x,
		y
	)	(((x) - 1) / (y) + 1)

Definition at line 53 of file jpegxl_parser.c.

◆ vlm

#define vlm	(	a,
		b
	)	{.sym = (a), .len = (b)}

Definition at line 54 of file jpegxl_parser.c.

Function Documentation

◆ jxl_u8()

static av_always_inline uint8_t jxl_u8 ( GetBitContext * gb )

static

Read a variable-length 8-bit integer.

Used when populating the ANS frequency tables.

Definition at line 202 of file jpegxl_parser.c.

Referenced by populate_distribution().

◆ jxl_u32()

static av_always_inline uint32_t jxl_u32	(	GetBitContext *	gb,
		uint32_t	c0,
		uint32_t	c1,
		uint32_t	c2,
		uint32_t	c3,
		uint32_t	u0,
		uint32_t	u1,
		uint32_t	u2,
		uint32_t	u3
	)

static

Definition at line 213 of file jpegxl_parser.c.

Referenced by parse_frame_header(), and read_distribution_bundle().

◆ jxl_u64()

static uint64_t jxl_u64 ( GetBitContext * gb )

static

Definition at line 229 of file jpegxl_parser.c.

Referenced by parse_frame_header(), skip_extensions(), and skip_icc_profile().

◆ read_hybrid_uint_conf()

static int read_hybrid_uint_conf	(	GetBitContext *	gb,
		JXLHybridUintConf *	conf,
		int	log_alphabet_size
	)

static

Definition at line 259 of file jpegxl_parser.c.

Referenced by read_distribution_bundle().

◆ read_hybrid_uint()

static int read_hybrid_uint	(	GetBitContext *	gb,
		const JXLHybridUintConf *	conf,
		uint32_t	token,
		uint32_t *	hybrid_uint
	)

static

Definition at line 277 of file jpegxl_parser.c.

Referenced by decode_hybrid_varlen_uint().

◆ read_prefix_symbol()

static uint32_t read_prefix_symbol	(	GetBitContext *	gb,
		const JXLSymbolDistribution *	dist
	)

inlinestatic

Definition at line 299 of file jpegxl_parser.c.

Referenced by decode_hybrid_varlen_uint().

◆ read_ans_symbol()

static uint32_t read_ans_symbol	(	GetBitContext *	gb,
		JXLEntropyDecoder *	dec,
		const JXLSymbolDistribution *	dist
	)

static

Definition at line 307 of file jpegxl_parser.c.

Referenced by decode_hybrid_varlen_uint().

◆ decode_hybrid_varlen_uint()

static int decode_hybrid_varlen_uint	(	GetBitContext *	gb,
		JXLEntropyDecoder *	dec,
		const JXLDistributionBundle *	bundle,
		uint32_t	context,
		uint32_t *	hybrid_uint
	)

static

Definition at line 327 of file jpegxl_parser.c.

Referenced by entropy_decoder_read_symbol(), and read_dist_clustering().

◆ populate_distribution()

static int populate_distribution	(	GetBitContext *	gb,
		JXLSymbolDistribution *	dist,
		int	log_alphabet_size
	)

static

Definition at line 380 of file jpegxl_parser.c.

Referenced by read_distribution_bundle().

◆ dist_bundle_close()

static void dist_bundle_close ( JXLDistributionBundle * bundle )

static

Definition at line 480 of file jpegxl_parser.c.

Referenced by entropy_decoder_close(), and read_dist_clustering().

◆ read_distribution_bundle()

static int read_distribution_bundle	(	GetBitContext *	gb,
		JXLEntropyDecoder *	dec,
		JXLDistributionBundle *	bundle,
		int	num_dist,
		int	disallow_lz77
	)

static

Definition at line 828 of file jpegxl_parser.c.

Referenced by entropy_decoder_init(), and read_dist_clustering().

◆ read_dist_clustering()

static int read_dist_clustering	(	GetBitContext *	gb,
		JXLEntropyDecoder *	dec,
		JXLDistributionBundle *	bundle
	)

static

Definition at line 493 of file jpegxl_parser.c.

Referenced by read_distribution_bundle().

◆ gen_alias_map()

static int gen_alias_map	(	JXLEntropyDecoder *	dec,
		JXLSymbolDistribution *	dist,
		int	log_alphabet_size
	)

static

Definition at line 562 of file jpegxl_parser.c.

Referenced by read_distribution_bundle().

◆ read_simple_vlc_prefix()

static int read_simple_vlc_prefix	(	GetBitContext *	gb,
		JXLEntropyDecoder *	dec,
		JXLSymbolDistribution *	dist
	)

static

Definition at line 624 of file jpegxl_parser.c.

Referenced by read_vlc_prefix().

◆ read_vlc_prefix()

static int read_vlc_prefix	(	GetBitContext *	gb,
		JXLEntropyDecoder *	dec,
		JXLSymbolDistribution *	dist
	)

static

Definition at line 682 of file jpegxl_parser.c.

Referenced by read_distribution_bundle().

◆ entropy_decoder_close()

static void entropy_decoder_close ( JXLEntropyDecoder * dec )

static

Definition at line 914 of file jpegxl_parser.c.

Referenced by entropy_decoder_init(), parse_frame_header(), and skip_icc_profile().

◆ entropy_decoder_init()

static int entropy_decoder_init	(	void *	avctx,
		GetBitContext *	gb,
		JXLEntropyDecoder *	dec,
		int	num_dist
	)

static

Definition at line 922 of file jpegxl_parser.c.

Referenced by parse_frame_header(), and skip_icc_profile().

◆ entropy_decoder_read_symbol()

static int64_t entropy_decoder_read_symbol	(	GetBitContext *	gb,
		JXLEntropyDecoder *	dec,
		uint32_t	context
	)

static

Definition at line 939 of file jpegxl_parser.c.

Referenced by parse_frame_header(), and skip_icc_profile().

◆ icc_context()

static uint32_t icc_context	(	uint64_t	i,
		uint32_t	b1,
		uint32_t	b2
	)

inlinestatic

Definition at line 951 of file jpegxl_parser.c.

Referenced by skip_icc_profile().

◆ toc_context()

static uint32_t toc_context ( uint32_t x )

inlinestatic

Definition at line 985 of file jpegxl_parser.c.

Referenced by parse_frame_header().

◆ populate_fields()

static void populate_fields	(	AVCodecParserContext *	s,
		AVCodecContext *	avctx,
		const FFJXLMetadata *	meta
	)

static

Definition at line 990 of file jpegxl_parser.c.

Referenced by try_parse().

◆ skip_icc_profile()

static int skip_icc_profile	(	void *	avctx,
		JXLParseContext *	ctx,
		GetBitContext *	gb
	)

static

Definition at line 1076 of file jpegxl_parser.c.

Referenced by try_parse().

◆ skip_extensions()

static int skip_extensions ( GetBitContext * gb )

static

Definition at line 1136 of file jpegxl_parser.c.

Referenced by parse_frame_header().

◆ parse_frame_header()

static int parse_frame_header	(	void *	avctx,
		JXLParseContext *	ctx,
		GetBitContext *	gb
	)

static

Definition at line 1161 of file jpegxl_parser.c.

Referenced by try_parse().

◆ skip_boxes()

static int skip_boxes	(	JXLParseContext *	ctx,
		const uint8_t *	buf,
		int	buf_size
	)

static

Definition at line 1350 of file jpegxl_parser.c.

Referenced by jpegxl_parse().

◆ try_parse()

static int try_parse	(	AVCodecParserContext *	s,
		AVCodecContext *	avctx,
		JXLParseContext *	ctx,
		const uint8_t *	buf,
		int	buf_size
	)

static

Definition at line 1395 of file jpegxl_parser.c.

Referenced by jpegxl_parse().

◆ jpegxl_parse()

static int jpegxl_parse	(	AVCodecParserContext *	s,
		AVCodecContext *	avctx,
		const uint8_t **	poutbuf,
		int *	poutbuf_size,
		const uint8_t *	buf,
		int	buf_size
	)

static

Definition at line 1468 of file jpegxl_parser.c.

Variable Documentation

◆ level0_table

const VLCElem level0_table[16]

static

Initial value:

= {
    vlm(0, 2), vlm(4, 2), vlm(3, 2), vlm(2, 3), vlm(0, 2), vlm(4, 2), vlm(3, 2), vlm(1, 4),
    vlm(0, 2), vlm(4, 2), vlm(3, 2), vlm(2, 3), vlm(0, 2), vlm(4, 2), vlm(3, 2), vlm(5, 4),
}

Definition at line 169 of file jpegxl_parser.c.

Referenced by read_vlc_prefix().

◆ dist_prefix_table

const VLCElem dist_prefix_table[128]

static

Initial value:

= {
    vlm(10, 3), vlm(12, 7), vlm(7, 3), vlm(3, 4), vlm(6, 3), vlm(8, 3), vlm(9, 3), vlm(5, 4),
    vlm(10, 3), vlm(4, 4),  vlm(7, 3), vlm(1, 4), vlm(6, 3), vlm(8, 3), vlm(9, 3), vlm(2, 4),
    vlm(10, 3), vlm(0, 5),  vlm(7, 3), vlm(3, 4), vlm(6, 3), vlm(8, 3), vlm(9, 3), vlm(5, 4),
    vlm(10, 3), vlm(4, 4),  vlm(7, 3), vlm(1, 4), vlm(6, 3), vlm(8, 3), vlm(9, 3), vlm(2, 4),
    vlm(10, 3), vlm(11, 6), vlm(7, 3), vlm(3, 4), vlm(6, 3), vlm(8, 3), vlm(9, 3), vlm(5, 4),
    vlm(10, 3), vlm(4, 4),  vlm(7, 3), vlm(1, 4), vlm(6, 3), vlm(8, 3), vlm(9, 3), vlm(2, 4),
    vlm(10, 3), vlm(0, 5),  vlm(7, 3), vlm(3, 4), vlm(6, 3), vlm(8, 3), vlm(9, 3), vlm(5, 4),
    vlm(10, 3), vlm(4, 4),  vlm(7, 3), vlm(1, 4), vlm(6, 3), vlm(8, 3), vlm(9, 3), vlm(2, 4),
    vlm(10, 3), vlm(13, 7), vlm(7, 3), vlm(3, 4), vlm(6, 3), vlm(8, 3), vlm(9, 3), vlm(5, 4),
    vlm(10, 3), vlm(4, 4),  vlm(7, 3), vlm(1, 4), vlm(6, 3), vlm(8, 3), vlm(9, 3), vlm(2, 4),
    vlm(10, 3), vlm(0, 5),  vlm(7, 3), vlm(3, 4), vlm(6, 3), vlm(8, 3), vlm(9, 3), vlm(5, 4),
    vlm(10, 3), vlm(4, 4),  vlm(7, 3), vlm(1, 4), vlm(6, 3), vlm(8, 3), vlm(9, 3), vlm(2, 4),
    vlm(10, 3), vlm(11, 6), vlm(7, 3), vlm(3, 4), vlm(6, 3), vlm(8, 3), vlm(9, 3), vlm(5, 4),
    vlm(10, 3), vlm(4, 4),  vlm(7, 3), vlm(1, 4), vlm(6, 3), vlm(8, 3), vlm(9, 3), vlm(2, 4),
    vlm(10, 3), vlm(0, 5),  vlm(7, 3), vlm(3, 4), vlm(6, 3), vlm(8, 3), vlm(9, 3), vlm(5, 4),
    vlm(10, 3), vlm(4, 4),  vlm(7, 3), vlm(1, 4), vlm(6, 3), vlm(8, 3), vlm(9, 3), vlm(2, 4),
}

Definition at line 175 of file jpegxl_parser.c.

Referenced by populate_distribution().

◆ prefix_codelen_map

const uint8_t prefix_codelen_map[18]

static

Initial value:

= {
    1, 2, 3, 4, 0, 5, 17, 6, 16, 7, 8, 9, 10, 11, 12, 13, 14, 15,
}

Definition at line 194 of file jpegxl_parser.c.

Referenced by read_vlc_prefix().

◆ ff_jpegxl_parser

const AVCodecParser ff_jpegxl_parser

Initial value:

= {
    .codec_ids      = { AV_CODEC_ID_JPEGXL },
    .priv_data_size = sizeof(JXLParseContext),
    .parser_parse   = jpegxl_parse,
    .parser_close   = ff_parse_close,
}

Definition at line 1526 of file jpegxl_parser.c.

Data Structures

Macros

Functions

Variables

Macro Definition Documentation

◆ UNCHECKED_BITSTREAM_READER

◆ BITSTREAM_READER_LE

◆ JXL_FLAG_NOISE

◆ JXL_FLAG_PATCHES

◆ JXL_FLAG_SPLINES

◆ JXL_FLAG_USE_LF_FRAME

◆ JXL_FLAG_SKIP_ADAPTIVE_LF_SMOOTH

◆ MAX_PREFIX_ALPHABET_SIZE

◆ clog1p

◆ unpack_signed

◆ div_ceil

◆ vlm

Function Documentation

◆ jxl_u8()

◆ jxl_u32()

◆ jxl_u64()

◆ read_hybrid_uint_conf()

◆ read_hybrid_uint()

◆ read_prefix_symbol()

◆ read_ans_symbol()

◆ decode_hybrid_varlen_uint()

◆ populate_distribution()

◆ dist_bundle_close()

◆ read_distribution_bundle()

◆ read_dist_clustering()

◆ gen_alias_map()

◆ read_simple_vlc_prefix()

◆ read_vlc_prefix()

◆ entropy_decoder_close()

◆ entropy_decoder_init()

◆ entropy_decoder_read_symbol()

◆ icc_context()

◆ toc_context()

◆ populate_fields()

◆ skip_icc_profile()

◆ skip_extensions()

◆ parse_frame_header()

◆ skip_boxes()

◆ try_parse()

◆ jpegxl_parse()

Variable Documentation

◆ level0_table

◆ dist_prefix_table

◆ prefix_codelen_map

◆ ff_jpegxl_parser