JPEG2000 image decoder. More...

#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"
#include "j2k.h"
#include "libavutil/common.h"

Data Structures
struct	J2kTile

struct	J2kDecoderContext

Macros
#define	JP2_SIG_TYPE 0x6A502020

#define	JP2_SIG_VALUE 0x0D0A870A

#define	JP2_CODESTREAM 0x6A703263

#define	HAD_COC 0x01

#define	HAD_QCC 0x02

Functions
static int	get_bits (J2kDecoderContext *s, int n)

static void	j2k_flush (J2kDecoderContext *s)

static int	tag_tree_decode (J2kDecoderContext s, J2kTgtNode node, int threshold)
	decode the value stored in node

static int	get_siz (J2kDecoderContext *s)
	get sizes and offsets of image, tiles; number of components

static int	get_cox (J2kDecoderContext s, J2kCodingStyle c)
	get common part for COD and COC segments

static int	get_cod (J2kDecoderContext s, J2kCodingStyle c, uint8_t *properties)
	get coding parameters for a particular tile or whole image

static int	get_coc (J2kDecoderContext s, J2kCodingStyle c, uint8_t *properties)
	get coding parameters for a component in the whole image on a particular tile

static int	get_qcx (J2kDecoderContext s, int n, J2kQuantStyle q)
	get common part for QCD and QCC segments

static int	get_qcd (J2kDecoderContext s, int n, J2kQuantStyle q, uint8_t *properties)
	get quantization parameters for a particular tile or a whole image

static int	get_qcc (J2kDecoderContext s, int n, J2kQuantStyle q, uint8_t *properties)
	get quantization parameters for a component in the whole image on in a particular tile

static uint8_t	get_sot (J2kDecoderContext *s)
	get start of tile segment

static int	init_tile (J2kDecoderContext *s, int tileno)

static int	getnpasses (J2kDecoderContext *s)
	read the number of coding passes

static int	getlblockinc (J2kDecoderContext *s)

static int	decode_packet (J2kDecoderContext s, J2kCodingStyle codsty, J2kResLevel rlevel, int precno, int layno, uint8_t expn, int numgbits)

static int	decode_packets (J2kDecoderContext s, J2kTile tile)

static void	decode_sigpass (J2kT1Context *t1, int width, int height, int bpno, int bandno, int bpass_csty_symbol, int vert_causal_ctx_csty_symbol)

static void	decode_refpass (J2kT1Context *t1, int width, int height, int bpno)

static void	decode_clnpass (J2kDecoderContext s, J2kT1Context t1, int width, int height, int bpno, int bandno, int seg_symbols)

static int	decode_cblk (J2kDecoderContext s, J2kCodingStyle codsty, J2kT1Context t1, J2kCblk cblk, int width, int height, int bandpos)

static void	mct_decode (J2kDecoderContext s, J2kTile tile)

static int	decode_tile (J2kDecoderContext s, J2kTile tile)

static void	cleanup (J2kDecoderContext *s)

static int	decode_codestream (J2kDecoderContext *s)

static int	jp2_find_codestream (J2kDecoderContext *s)

static int	decode_frame (AVCodecContext avctx, void data, int got_frame, AVPacket avpkt)

static av_cold int	j2kdec_init (AVCodecContext *avctx)

static av_cold int	decode_end (AVCodecContext *avctx)

Variables
AVCodec	ff_jpeg2000_decoder

Detailed Description

JPEG2000 image decoder.

Author: Kamil Nowosad

Definition in file j2kdec.c.

Macro Definition Documentation

#define JP2_SIG_TYPE 0x6A502020

Definition at line 36 of file j2kdec.c.

Referenced by decode_frame().

#define JP2_SIG_VALUE 0x0D0A870A

Definition at line 37 of file j2kdec.c.

Referenced by decode_frame().

#define JP2_CODESTREAM 0x6A703263

Definition at line 38 of file j2kdec.c.

Referenced by jp2_find_codestream().

#define HAD_COC 0x01

Definition at line 40 of file j2kdec.c.

Referenced by get_coc(), and get_cod().

#define HAD_QCC 0x02

Definition at line 41 of file j2kdec.c.

Referenced by get_qcc(), and get_qcd().

Function Documentation

static int get_bits	(	J2kDecoderContext *	s,
		int	n
	)

static

Definition at line 78 of file j2kdec.c.

Referenced by decode_packet(), getlblockinc(), getnpasses(), and tag_tree_decode().

static void j2k_flush ( J2kDecoderContext * s )

static

Definition at line 93 of file j2kdec.c.

Referenced by decode_packet().

static int tag_tree_decode	(	J2kDecoderContext *	s,
		J2kTgtNode *	node,
		int	threshold
	)

static

decode the value stored in node

Definition at line 166 of file j2kdec.c.

Referenced by decode_packet().

static int get_siz ( J2kDecoderContext * s )

static

get sizes and offsets of image, tiles; number of components

Definition at line 205 of file j2kdec.c.

Referenced by decode_codestream().

static int get_cox	(	J2kDecoderContext *	s,
		J2kCodingStyle *	c
	)

static

get common part for COD and COC segments

Definition at line 297 of file j2kdec.c.

Referenced by get_coc(), and get_cod().

static int get_cod	(	J2kDecoderContext *	s,
		J2kCodingStyle *	c,
		uint8_t *	properties
	)

static

get coding parameters for a particular tile or whole image

Definition at line 320 of file j2kdec.c.

Referenced by decode_codestream().

static int get_coc	(	J2kDecoderContext *	s,
		J2kCodingStyle *	c,
		uint8_t *	properties
	)

static

get coding parameters for a component in the whole image on a particular tile

Definition at line 350 of file j2kdec.c.

Referenced by decode_codestream().

static int get_qcx	(	J2kDecoderContext *	s,
		int	n,
		J2kQuantStyle *	q
	)

static

get common part for QCD and QCC segments

Definition at line 368 of file j2kdec.c.

Referenced by get_qcc(), and get_qcd().

static int get_qcd	(	J2kDecoderContext *	s,
		int	n,
		J2kQuantStyle *	q,
		uint8_t *	properties
	)

static

get quantization parameters for a particular tile or a whole image

Definition at line 411 of file j2kdec.c.

Referenced by decode_codestream().

static int get_qcc	(	J2kDecoderContext *	s,
		int	n,
		J2kQuantStyle *	q,
		uint8_t *	properties
	)

static

get quantization parameters for a component in the whole image on in a particular tile

Definition at line 425 of file j2kdec.c.

Referenced by decode_codestream().

static uint8_t get_sot ( J2kDecoderContext * s )

static

get start of tile segment

< Isot

< Psot (ignored)

< TPsot

< TNsot

Definition at line 438 of file j2kdec.c.

Referenced by decode_codestream().

static int init_tile	(	J2kDecoderContext *	s,
		int	tileno
	)

static

Definition at line 463 of file j2kdec.c.

Referenced by decode_codestream().

static int getnpasses ( J2kDecoderContext * s )

static

read the number of coding passes

Definition at line 490 of file j2kdec.c.

Referenced by decode_packet().

static int getlblockinc ( J2kDecoderContext * s )

static

Definition at line 505 of file j2kdec.c.

Referenced by decode_packet().

static int decode_packet	(	J2kDecoderContext *	s,
		J2kCodingStyle *	codsty,
		J2kResLevel *	rlevel,
		int	precno,
		int	layno,
		uint8_t *	expn,
		int	numgbits
	)

static

Definition at line 516 of file j2kdec.c.

Referenced by decode_packets().

static int decode_packets	(	J2kDecoderContext *	s,
		J2kTile *	tile
	)

static

Definition at line 591 of file j2kdec.c.

Referenced by decode_codestream().

static void decode_sigpass	(	J2kT1Context *	t1,
		int	width,
		int	height,
		int	bpno,
		int	bandno,
		int	bpass_csty_symbol,
		int	vert_causal_ctx_csty_symbol
	)

static

Definition at line 618 of file j2kdec.c.

Referenced by decode_cblk().

static void decode_refpass	(	J2kT1Context *	t1,
		int	width,
		int	height,
		int	bpno
	)

static

Definition at line 645 of file j2kdec.c.

Referenced by decode_cblk().

static void decode_clnpass	(	J2kDecoderContext *	s,
		J2kT1Context *	t1,
		int	width,
		int	height,
		int	bpno,
		int	bandno,
		int	seg_symbols
	)

static

Definition at line 665 of file j2kdec.c.

Referenced by decode_cblk().

static int decode_cblk	(	J2kDecoderContext *	s,
		J2kCodingStyle *	codsty,
		J2kT1Context *	t1,
		J2kCblk *	cblk,
		int	width,
		int	height,
		int	bandpos
	)

static

Definition at line 715 of file j2kdec.c.

Referenced by decode_tile().

static void mct_decode	(	J2kDecoderContext *	s,
		J2kTile *	tile
	)

static

Definition at line 758 of file j2kdec.c.

Referenced by decode_tile().

static int decode_tile	(	J2kDecoderContext *	s,
		J2kTile *	tile
	)

static

Definition at line 789 of file j2kdec.c.

Referenced by decode_frame().

static void cleanup ( J2kDecoderContext * s )

static

Definition at line 906 of file j2kdec.c.

Referenced by decode_frame().

static int decode_codestream ( J2kDecoderContext * s )

static

Definition at line 921 of file j2kdec.c.

Referenced by decode_frame().

static int jp2_find_codestream ( J2kDecoderContext * s )

static

Definition at line 997 of file j2kdec.c.

Referenced by decode_frame().

static int decode_frame	(	AVCodecContext *	avctx,
		void *	data,
		int *	got_frame,
		AVPacket *	avpkt
	)

static

Definition at line 1020 of file j2kdec.c.

static av_cold int j2kdec_init ( AVCodecContext * avctx )

static

Definition at line 1074 of file j2kdec.c.

static av_cold int decode_end ( AVCodecContext * avctx )

static

Definition at line 1087 of file j2kdec.c.

Variable Documentation

AVCodec ff_jpeg2000_decoder

Initial value:

= {
    .name           = "j2k",
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_JPEG2000,
    .priv_data_size = sizeof(J2kDecoderContext),
    .init           = j2kdec_init,
    .close          = decode_end,
    .decode         = decode_frame,
    .capabilities   = CODEC_CAP_EXPERIMENTAL,
    .long_name      = NULL_IF_CONFIG_SMALL("JPEG 2000"),
}

Definition at line 1097 of file j2kdec.c.

Data Structures

Macros

Functions

Variables

Detailed Description

Macro Definition Documentation

Function Documentation

Variable Documentation