jpegutils.c File Reference

#include "jpegutils.h"
#include <jpeglib.h>
#include <jerror.h>
#include <assert.h>
#include <setjmp.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>

Go to the source code of this file.

Classes
struct	my_error_mgr

Macros
#define	MAX_LUMA_WIDTH   4096
#define	MAX_CHROMA_WIDTH   2048

Functions
int	decode_jpeg_raw (unsigned char *jpeg_data, int len, int itype, int ctype, unsigned int width, unsigned int height, unsigned char *raw0, unsigned char *raw1, unsigned char *raw2)
	decode JPEG buffer
int	decode_jpeg_gray_raw (unsigned char *jpeg_data, int len, int itype, int ctype, unsigned int width, unsigned int height, unsigned char *raw0, unsigned char *raw1, unsigned char *raw2)
	decode JPEG raw gray buffer
int	encode_jpeg_raw (unsigned char *jpeg_data, int len, int quality, int itype, int ctype, unsigned int width, unsigned int height, unsigned char *raw0, unsigned char *raw1, unsigned char *raw2)
	encode raw JPEG buffer
int	decode_jpeg_rgb (unsigned char *inBuffer, unsigned long inSize, uint8_t **memptr, size_t *memsize, int *naxis, int *w, int *h)
	decode_jpeg_rgb Read jpeg in memory buffer and produce RGB image

Macro Definition Documentation

MAX_CHROMA_WIDTH

#define MAX_CHROMA_WIDTH   2048

Definition at line 292 of file jpegutils.c.

MAX_LUMA_WIDTH

#define MAX_LUMA_WIDTH   4096

Definition at line 291 of file jpegutils.c.

Function Documentation

decode_jpeg_gray_raw()

int decode_jpeg_gray_raw	(	unsigned char *	jpeg_data,
		int	len,
		int	itype,
		int	ctype,
		unsigned int	width,
		unsigned int	height,
		unsigned char *	raw0,
		unsigned char *	raw1,
		unsigned char *	raw2
	)

decode JPEG raw gray buffer

Definition at line 837 of file jpegutils.c.

decode_jpeg_raw()

int decode_jpeg_raw	(	unsigned char *	jpeg_data,
		int	len,
		int	itype,
		int	ctype,
		unsigned int	width,
		unsigned int	height,
		unsigned char *	raw0,
		unsigned char *	raw1,
		unsigned char *	raw2
	)

decode JPEG buffer

Definition at line 461 of file jpegutils.c.

decode_jpeg_rgb()

int decode_jpeg_rgb	(	unsigned char *	inBuffer,
		unsigned long	inSize,
		uint8_t **	memptr,
		size_t *	memsize,
		int *	naxis,
		int *	w,
		int *	h
	)

decode_jpeg_rgb Read jpeg in memory buffer and produce RGB image

Parameters

inBuffer	pointer to jpeg file in memory
inSize	file of jpeg file in bytes
memptr	pointer to store RGB data. To enhance performance, the memory must be allocated at least byte. memptr = malloc(1) since subsequent calls will use realloc to allocate memory. The caller is responsible for free(*memptr) eventually.
memsize	size of RGB data as determined after jpeg decompression
naxis	1 for mono, 3 for color
w	width of image in pixels
h	height image in pixels

Returns

0 if decoding succeeds, -1 otherwise.

Definition at line 1309 of file jpegutils.c.

encode_jpeg_raw()

int encode_jpeg_raw	(	unsigned char *	jpeg_data,
		int	len,
		int	quality,
		int	itype,
		int	ctype,
		unsigned int	width,
		unsigned int	height,
		unsigned char *	raw0,
		unsigned char *	raw1,
		unsigned char *	raw2
	)

encode raw JPEG buffer

Definition at line 1156 of file jpegutils.c.