jpegxl_probe.c File Reference

#include "jpegxl_probe.h"
#include "libavcodec/get_bits.h"

Go to the source code of this file.

Macros
#define	BITSTREAM_READER_LE
#define	jxl_bits(n)   get_bits_long(gb, (n))
#define	jxl_bits_skip(n)   skip_bits_long(gb, (n))
#define	jxl_u32(c0, c1, c2, c3, u0, u1, u2, u3)
#define	jxl_u64()   jpegxl_u64(gb)
#define	jxl_enum()   jxl_u32(0, 1, 2, 18, 0, 0, 4, 6)

Enumerations
enum	JpegXLExtraChannelType {   FF_JPEGXL_CT_ALPHA = 0, FF_JPEGXL_CT_DEPTH, FF_JPEGXL_CT_SPOT_COLOR, FF_JPEGXL_CT_SELECTION_MASK,   FF_JPEGXL_CT_BLACK, FF_JPEGXL_CT_CFA, FF_JPEGXL_CT_THERMAL, FF_JPEGXL_CT_NON_OPTIONAL = 15,   FF_JPEGXL_CT_OPTIONAL }
enum	JpegXLColorSpace { FF_JPEGXL_CS_RGB = 0, FF_JPEGXL_CS_GRAY, FF_JPEGXL_CS_XYB, FF_JPEGXL_CS_UNKNOWN }
enum	JpegXLWhitePoint { FF_JPEGXL_WP_D65 = 1, FF_JPEGXL_WP_CUSTOM, FF_JPEGXL_WP_E = 10, FF_JPEGXL_WP_DCI = 11 }
enum	JpegXLPrimaries { FF_JPEGXL_PR_SRGB = 1, FF_JPEGXL_PR_CUSTOM, FF_JPEGXL_PR_2100 = 9, FF_JPEGXL_PR_P3 = 11 }

Functions
static uint32_t	jpegxl_u32 (GetBitContext *gb, const uint32_t constants[4], const uint32_t ubits[4])
static uint64_t	jpegxl_u64 (GetBitContext *gb)
static uint32_t	jpegxl_width_from_ratio (uint32_t height, int ratio)
static int	jpegxl_read_size_header (GetBitContext *gb)
	validate a Jpeg XL Size Header More...
static int	jpegxl_read_preview_header (GetBitContext *gb)
	validate a Jpeg XL Preview Header More...
static void	jpegxl_skip_bit_depth (GetBitContext *gb)
	skip a Jpeg XL BitDepth Header. More...
static int	jpegxl_read_extra_channel_info (GetBitContext *gb)
	validate a Jpeg XL Extra Channel Info bundle More...
int	ff_jpegxl_verify_codestream_header (const uint8_t *buf, int buflen)

Macro Definition Documentation

BITSTREAM_READER_LE

#define BITSTREAM_READER_LE

Definition at line 24 of file jpegxl_probe.c.

jxl_bits

#define jxl_bits

(

n

)

get_bits_long(gb, (n))

Definition at line 60 of file jpegxl_probe.c.

jxl_bits_skip

#define jxl_bits_skip

(

n

)

skip_bits_long(gb, (n))

Definition at line 61 of file jpegxl_probe.c.

jxl_u32

#define jxl_u32	(		c0,
			c1,
			c2,
			c3,
			u0,
			u1,
			u2,
			u3
	)

Value:

    jpegxl_u32(gb, \
    (const uint32_t[]){c0, c1, c2, c3}, (const uint32_t[]){u0, u1, u2, u3})

Definition at line 62 of file jpegxl_probe.c.

jxl_u64

#define jxl_u64

(

)

jpegxl_u64(gb)

Definition at line 64 of file jpegxl_probe.c.

jxl_enum

#define jxl_enum

(

)

jxl_u32(0, 1, 2, 18, 0, 0, 4, 6)

Definition at line 65 of file jpegxl_probe.c.

Enumeration Type Documentation

JpegXLExtraChannelType

enum JpegXLExtraChannelType

Enumerator
FF_JPEGXL_CT_ALPHA
FF_JPEGXL_CT_DEPTH
FF_JPEGXL_CT_SPOT_COLOR
FF_JPEGXL_CT_SELECTION_MASK
FF_JPEGXL_CT_BLACK
FF_JPEGXL_CT_CFA
FF_JPEGXL_CT_THERMAL
FF_JPEGXL_CT_NON_OPTIONAL
FF_JPEGXL_CT_OPTIONAL

Definition at line 27 of file jpegxl_probe.c.

JpegXLColorSpace

enum JpegXLColorSpace

Enumerator
FF_JPEGXL_CS_RGB
FF_JPEGXL_CS_GRAY
FF_JPEGXL_CS_XYB
FF_JPEGXL_CS_UNKNOWN

Definition at line 39 of file jpegxl_probe.c.

JpegXLWhitePoint

enum JpegXLWhitePoint

Enumerator
FF_JPEGXL_WP_D65
FF_JPEGXL_WP_CUSTOM
FF_JPEGXL_WP_E
FF_JPEGXL_WP_DCI

Definition at line 46 of file jpegxl_probe.c.

JpegXLPrimaries

enum JpegXLPrimaries

Enumerator
FF_JPEGXL_PR_SRGB
FF_JPEGXL_PR_CUSTOM
FF_JPEGXL_PR_2100
FF_JPEGXL_PR_P3

Definition at line 53 of file jpegxl_probe.c.

Function Documentation

jpegxl_u32()

static uint32_t jpegxl_u32 ( GetBitContext *  gb, const uint32_t  constants[4], const uint32_t  ubits[4]  )

static

Definition at line 68 of file jpegxl_probe.c.

jpegxl_u64()

static uint64_t jpegxl_u64 ( GetBitContext *  gb )

static

Definition at line 81 of file jpegxl_probe.c.

jpegxl_width_from_ratio()

static uint32_t jpegxl_width_from_ratio ( uint32_t  height, int  ratio  )

static

Definition at line 112 of file jpegxl_probe.c.

Referenced by jpegxl_read_preview_header(), and jpegxl_read_size_header().

jpegxl_read_size_header()

static int jpegxl_read_size_header ( GetBitContext *  gb )

static

validate a Jpeg XL Size Header

Returns

>= 0 upon valid size, < 0 upon invalid size found

Definition at line 141 of file jpegxl_probe.c.

Referenced by ff_jpegxl_verify_codestream_header().

jpegxl_read_preview_header()

static int jpegxl_read_preview_header ( GetBitContext *  gb )

static

validate a Jpeg XL Preview Header

Returns

>= 0 upon valid size, < 0 upon invalid size found

Definition at line 169 of file jpegxl_probe.c.

Referenced by ff_jpegxl_verify_codestream_header().

jpegxl_skip_bit_depth()

static void jpegxl_skip_bit_depth ( GetBitContext *  gb )

static

skip a Jpeg XL BitDepth Header.

These cannot be invalid.

Definition at line 195 of file jpegxl_probe.c.

Referenced by ff_jpegxl_verify_codestream_header(), and jpegxl_read_extra_channel_info().

jpegxl_read_extra_channel_info()

static int jpegxl_read_extra_channel_info ( GetBitContext *  gb )

static

validate a Jpeg XL Extra Channel Info bundle

Returns

>= 0 upon valid, < 0 upon invalid

Definition at line 211 of file jpegxl_probe.c.

Referenced by ff_jpegxl_verify_codestream_header().

ff_jpegxl_verify_codestream_header()

int ff_jpegxl_verify_codestream_header	(	const uint8_t *	buf,
		int	buflen
	)

Definition at line 246 of file jpegxl_probe.c.

Referenced by jpegxl_probe().