jpegutils.h File Reference

#include <stddef.h>
#include <stdio.h>
#include <inttypes.h>

Go to the source code of this file.

Macros
#define	Y4M_ILACE_NONE   0 /** non-interlaced, progressive frame */
#define	Y4M_ILACE_TOP_FIRST   1 /** interlaced, top-field first */
#define	Y4M_ILACE_BOTTOM_FIRST   2 /** interlaced, bottom-field first */
#define	Y4M_ILACE_MIXED   3 /** mixed, "refer to frame header" */
#define	Y4M_CHROMA_420JPEG   0 /** 4:2:0, H/V centered, for JPEG/MPEG-1 */
#define	Y4M_CHROMA_420MPEG2   1 /** 4:2:0, H cosited, for MPEG-2 */
#define	Y4M_CHROMA_420PALDV   2 /** 4:2:0, alternating Cb/Cr, for PAL-DV */
#define	Y4M_CHROMA_444   3 /** 4:4:4, no subsampling, phew. */
#define	Y4M_CHROMA_422   4 /** 4:2:2, H cosited */
#define	Y4M_CHROMA_411   5 /** 4:1:1, H cosited */
#define	Y4M_CHROMA_MONO   6 /** luma plane only */
#define	Y4M_CHROMA_444ALPHA   7 /** 4:4:4 with an alpha channel */

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_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
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

Macro Definition Documentation

Y4M_CHROMA_411

#define Y4M_CHROMA_411   5 /** 4:1:1, H cosited */

Definition at line 46 of file jpegutils.h.

Y4M_CHROMA_420JPEG

#define Y4M_CHROMA_420JPEG   0 /** 4:2:0, H/V centered, for JPEG/MPEG-1 */

Definition at line 41 of file jpegutils.h.

Y4M_CHROMA_420MPEG2

#define Y4M_CHROMA_420MPEG2   1 /** 4:2:0, H cosited, for MPEG-2 */

Definition at line 42 of file jpegutils.h.

Y4M_CHROMA_420PALDV

#define Y4M_CHROMA_420PALDV   2 /** 4:2:0, alternating Cb/Cr, for PAL-DV */

Definition at line 43 of file jpegutils.h.

Y4M_CHROMA_422

#define Y4M_CHROMA_422   4 /** 4:2:2, H cosited */

Definition at line 45 of file jpegutils.h.

Y4M_CHROMA_444

#define Y4M_CHROMA_444   3 /** 4:4:4, no subsampling, phew. */

Definition at line 44 of file jpegutils.h.

Y4M_CHROMA_444ALPHA

#define Y4M_CHROMA_444ALPHA   7 /** 4:4:4 with an alpha channel */

Definition at line 48 of file jpegutils.h.

Y4M_CHROMA_MONO

#define Y4M_CHROMA_MONO   6 /** luma plane only */

Definition at line 47 of file jpegutils.h.

Y4M_ILACE_BOTTOM_FIRST

#define Y4M_ILACE_BOTTOM_FIRST   2 /** interlaced, bottom-field first */

Definition at line 38 of file jpegutils.h.

Y4M_ILACE_MIXED

#define Y4M_ILACE_MIXED   3 /** mixed, "refer to frame header" */

Definition at line 39 of file jpegutils.h.

Y4M_ILACE_NONE

#define Y4M_ILACE_NONE   0 /** non-interlaced, progressive frame */

Definition at line 36 of file jpegutils.h.

Y4M_ILACE_TOP_FIRST

#define Y4M_ILACE_TOP_FIRST   1 /** interlaced, top-field first */

Definition at line 37 of file jpegutils.h.

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.