jpegutils.h

/*
 * jpegutils.h: Some Utility programs for dealing with
 *               JPEG encoded images
 *
 *  Copyright (C) 1999 Rainer Johanni <Rainer@Johanni.de>
 *  Copyright (C) 2001 pHilipp Zabel  <pzabel@gmx.de>
 *  Copyright (C) 2008 Angel Carpintero <motiondevelop@gmail.com>
 *
 */

#ifndef __JPEGUTILS_H__
#define __JPEGUTILS_H__

 /*
  * jpeg_data:       buffer with input / output jpeg
  * len:             Length of jpeg buffer
  * itype:           Y4M_ILACE_NONE: Not interlaced
  *                  Y4M_ILACE_TOP_FIRST: Interlaced, top-field-first
  *                  Y4M_ILACE_BOTTOM_FIRST: Interlaced, bottom-field-first
  * ctype            Chroma format for decompression.
  *                  Currently always 420 and hence ignored.
  * raw0             buffer with input / output raw Y channel
  * raw1             buffer with input / output raw U/Cb channel
  * raw2             buffer with input / output raw V/Cr channel
  * width            width of Y channel (width of U/V is width/2)
  * height           height of Y channel (height of U/V is height/2)
  */


#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          */



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);

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);

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);
#endif