spcadecoder.c

凌阳SPCA5XX解码芯片USB驱动源代码

/****************************************************************************
#	 	spcadecoder: Generic decoder for various input stream yyuv  #
# yuyv yuvy jpeg411 jpeg422 bayer rggb with gamma correct                   #
# and various output palette rgb16 rgb24 rgb32 yuv420p                      #
# various output size with crop feature                                     #
# 		Copyright (C) 2003 2004 2005 Michel Xhaard                  #
# 		[e-mail]                                            #
# 		Sonix Decompressor by B.S. (C) 2004                         #
# This program is free software; you can redistribute it and/or modify      #
# it under the terms of the GNU General Public License as published by      #
# the Free Software Foundation; either version 2 of the License, or         #
# (at your option) any later version.                                       #
#                                                                           #
# This program is distributed in the hope that it will be useful,           #
# but WITHOUT ANY WARRANTY; without even the implied warranty of            #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the             #
# GNU General Public License for more details.                              #
#                                                                           #
# You should have received a copy of the GNU General Public License         #
# along with this program; if not, write to the Free Software               #
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA #
#                                                                           #
****************************************************************************/


#ifndef __KERNEL__
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#else /* __KERNEL__ */
#include <linux/string.h>
#endif /* __KERNEL__ */


#include "spcadecoder.h"
#include "jpeg_header.h"
#include "spcagamma.h"

#define ISHIFT 11

#define IFIX(a) ((long)((a) * (1 << ISHIFT) + .5))
#define IMULT(a, b) (((a) * (b)) >> ISHIFT)
#define ITOINT(a) ((a) >> ISHIFT)

/* special markers */
#define M_BADHUFF	-1

struct in {
	unsigned char *p;
	unsigned int bits;
	int omitescape;
	int left;
	int marker;
};

/*********************************/
struct dec_hufftbl;
struct enc_hufftbl;

union hufftblp {
	struct dec_hufftbl *dhuff;
	struct enc_hufftbl *ehuff;
};

struct scan {
	int dc;			/* old dc value */
	union hufftblp hudc;
	union hufftblp huac;
	int next;		/* when to switch to next scan */
	int cid;		/* component id */
	int hv;			/* horiz/vert, copied from comp */
	int tq;			/* quant tbl, copied from comp */
};

/*********************************/

#define DECBITS 10		/* seems to be the optimum */

struct dec_hufftbl {
	int maxcode[17];
	int valptr[16];
	unsigned char vals[256];
	unsigned int llvals[1 << DECBITS];
};


/*********************************/


/*********************************/

/*********************************/
struct comp {
	int cid;
	int hv;
	int tq;
};

struct jpginfo {
	int nc;			/* number of components */
	int ns;			/* number of scans */
	int dri;		/* restart interval */
	int nm;			/* mcus til next marker */
	int rm;			/* next restart marker */
};


/* Sonix decompressor struct B.S.(2004) */
typedef struct {
	int is_abs;
	int len;
	int val;
} code_table_t;
static code_table_t table[256];

#define MAXCOMP 4
#define ERR_NO_SOI 1
#define ERR_NOT_8BIT 2
#define ERR_HEIGHT_MISMATCH 3
#define ERR_WIDTH_MISMATCH 4
#define ERR_BAD_WIDTH_OR_HEIGHT 5
#define ERR_TOO_MANY_COMPPS 6
#define ERR_ILLEGAL_HV 7
#define ERR_QUANT_TABLE_SELECTOR 8
#define ERR_NOT_YCBCR_221111 9
#define ERR_UNKNOWN_CID_IN_SCAN 10
#define ERR_NOT_SEQUENTIAL_DCT 11
#define ERR_WRONG_MARKER 12
#define ERR_NO_EOI 13
#define ERR_BAD_TABLES 14
#define ERR_DEPTH_MISMATCH 15
#define ERR_CORRUPTFRAME 16

#define JPEGHEADER_LENGTH 589
const unsigned char JPEGHeaderz[JPEGHEADER_LENGTH] =
{
 0xff, 0xd8, 0xff, 0xdb, 0x00, 0x84, 0x00, 0x08, 0x06, 0x06, 0x07, 0x06, 0x05, 0x08, 0x07, 0x07,
 0x07, 0x09, 0x09, 0x08, 0x0a, 0x0c, 0x14, 0x0a, 0x0c, 0x0b, 0x0b, 0x0c, 0x19, 0x12, 0x13, 0x0f,
 0x14, 0x1d, 0x1a, 0x1f, 0x1e, 0x1d, 0x1a, 0x1c, 0x1c, 0x20, 0x24, 0x2e, 0x27, 0x20, 0x22, 0x2c,
 0x23, 0x1c, 0x1c, 0x28, 0x37, 0x29, 0x2c, 0x30, 0x31, 0x34, 0x34, 0x34, 0x1f, 0x27, 0x39, 0x3d,
 0x38, 0x32, 0x3c, 0x2e, 0x33, 0x34, 0x32, 0x01, 0x09, 0x09, 0x09, 0x0c, 0x0b, 0x0c, 0x18, 0x0a,
 0x0a, 0x18, 0x32, 0x21, 0x1c, 0x21, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32,
 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32,
 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32,
 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0x32, 0xff, 0xc4, 0x01, 0xa2, 0x00, 0x00, 0x01, 0x05,
 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02,
 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x01, 0x00, 0x03, 0x01, 0x01, 0x01, 0x01,
 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05,
 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x10, 0x00, 0x02, 0x01, 0x03, 0x03, 0x02, 0x04, 0x03, 0x05,
 0x05, 0x04, 0x04, 0x00, 0x00, 0x01, 0x7d, 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12, 0x21,
 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07, 0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08, 0x23,
 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0, 0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16, 0x17,
 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a,
 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a,
 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a,
 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99,
 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7,
 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4, 0xd5,
 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xf1,
 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0x11, 0x00, 0x02, 0x01, 0x02, 0x04, 0x04,
 0x03, 0x04, 0x07, 0x05, 0x04, 0x04, 0x00, 0x01, 0x02, 0x77, 0x00, 0x01, 0x02, 0x03, 0x11, 0x04,
 0x05, 0x21, 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71, 0x13, 0x22, 0x32, 0x81, 0x08, 0x14,
 0x42, 0x91, 0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0, 0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16,
 0x24, 0x34, 0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x35, 0x36,
 0x37, 0x38, 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56,
 0x57, 0x58, 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76,
 0x77, 0x78, 0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94,
 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2,
 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9,
 0xca, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
 0xe8, 0xe9, 0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xff, 0xc0, 0x00, 0x11,
 0x08, 0x01, 0xe0, 0x02, 0x80, 0x03, 0x01, 0x21, 0x00, 0x02, 0x11, 0x01, 0x03, 0x11, 0x01, 0xff,
 0xda, 0x00, 0x0c, 0x03, 0x01, 0x00, 0x02, 0x11, 0x03, 0x11, 0x00, 0x3f, 0x00
 };
const unsigned char JPEGHeader[JPEGHEADER_LENGTH] =
{
 0xff, 0xd8, 0xff, 0xdb, 0x00, 0x84, 0x00, 0x06, 0x04, 0x05, 0x06, 0x05, 0x04, 0x06, 0x06, 0x05,
 0x06, 0x07, 0x07, 0x06, 0x08, 0x0a, 0x10, 0x0a, 0x0a, 0x09, 0x09, 0x0a, 0x14, 0x0e, 0x0f, 0x0c,
 0x10, 0x17, 0x14, 0x18, 0x18, 0x17, 0x14, 0x16, 0x16, 0x1a, 0x1d, 0x25, 0x1f, 0x1a, 0x1b, 0x23,
 0x1c, 0x16, 0x16, 0x20, 0x2c, 0x20, 0x23, 0x26, 0x27, 0x29, 0x2a, 0x29, 0x19, 0x1f, 0x2d, 0x30,
 0x2d, 0x28, 0x30, 0x25, 0x28, 0x29, 0x28, 0x01, 0x07, 0x07, 0x07, 0x0a, 0x08, 0x0a, 0x13, 0x0a,
 0x0a, 0x13, 0x28, 0x1a, 0x16, 0x1a, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28,
 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28,
 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28,
 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0x28, 0xff, 0xc4, 0x01, 0xa2, 0x00, 0x00, 0x01, 0x05,
 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02,
 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x01, 0x00, 0x03, 0x01, 0x01, 0x01, 0x01,
 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05,
 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x10, 0x00, 0x02, 0x01, 0x03, 0x03, 0x02, 0x04, 0x03, 0x05,
 0x05, 0x04, 0x04, 0x00, 0x00, 0x01, 0x7d, 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12, 0x21,
 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07, 0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08, 0x23,
 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0, 0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16, 0x17,
 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a,
 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a,
 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a,
 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99,
 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7,
 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4, 0xd5,
 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xf1,
 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0x11, 0x00, 0x02, 0x01, 0x02, 0x04, 0x04,
 0x03, 0x04, 0x07, 0x05, 0x04, 0x04, 0x00, 0x01, 0x02, 0x77, 0x00, 0x01, 0x02, 0x03, 0x11, 0x04,
 0x05, 0x21, 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71, 0x13, 0x22, 0x32, 0x81, 0x08, 0x14,
 0x42, 0x91, 0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0, 0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16,
 0x24, 0x34, 0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x35, 0x36,
 0x37, 0x38, 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56,
 0x57, 0x58, 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76,
 0x77, 0x78, 0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94,
 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2,
 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9,
 0xca, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
 0xe8, 0xe9, 0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xff, 0xc0, 0x00, 0x11,
 0x08, 0x01, 0xe0, 0x02, 0x80, 0x03, 0x01, 0x21, 0x00, 0x02, 0x11, 0x01, 0x03, 0x11, 0x01, 0xff,
 0xda, 0x00, 0x0c, 0x03, 0x01, 0x00, 0x02, 0x11, 0x03, 0x11, 0x00, 0x3f, 0x00
 };

int spca50x_outpicture ( struct spca50x_frame *myframe );

static int jpeg_decode411(struct spca50x_frame *myframe, int force_rgb);
static int jpeg_decode422(struct spca50x_frame *myframe, int force_rgb);
static int yuv_decode(struct spca50x_frame *myframe, int force_rgb);
static int bayer_decode(struct spca50x_frame *myframe, int force_rgb);
static int make_jpeg ( struct spca50x_frame *myframe );
static int make_jpeg_conexant (struct spca50x_frame *myframe);


#define CLIP(color) (unsigned char)(((color)>0xFF)?0xff:(((color)<0)?0:(color)))
/****************************************************************/
/**************      Sonix  huffman decoder      ****************/
/****************************************************************/
void init_sonix_decoder(void)
{
	int i;
	int is_abs, val, len;

	for (i = 0; i < 256; i++) {
		is_abs = 0;
		val = 0;
		len = 0;
		if ((i & 0x80) == 0) {
			/* code 0 */
			val = 0;
			len = 1;
		}
		else if ((i & 0xE0) == 0x80) {
			/* code 100 */
			val = +4;
			len = 3;
		}
		else if ((i & 0xE0) == 0xA0) {
			/* code 101 */
			val = -4;
			len = 3;
		}
		else if ((i & 0xF0) == 0xD0) {
			/* code 1101 */
			val = +11;
			len = 4;
		}
		else if ((i & 0xF0) == 0xF0) {
			/* code 1111 */
			val = -11;
			len = 4;
		}
		else if ((i & 0xF8) == 0xC8) {
			/* code 11001 */
			val = +20;
			len = 5;
		}
		else if ((i & 0xFC) == 0xC0) {
			/* code 110000 */
			val = -20;
			len = 6;
		}
		else if ((i & 0xFC) == 0xC4) {
			/* code 110001xx: unknown */
			val = 0;
			len = 8;
		}
		else if ((i & 0xF0) == 0xE0) {
			/* code 1110xxxx */
			is_abs = 1;
			val = (i & 0x0F) << 4;
			len = 8;
		}
		table[i].is_abs = is_abs;
		table[i].val = val;
		table[i].len = len;
	}
}

static void sonix_decompress(int width, int height, unsigned char *inp, unsigned char *outp)
{
	int row, col;
	int val;
	int bitpos;
	unsigned char code;
	unsigned char *addr;

	bitpos = 0;
	for (row = 0; row < height; row++) {

		col = 0;

		/* first two pixels in first two rows are stored as raw 8-bit */
		if (row < 2) {
			addr = inp + (bitpos >> 3);
			code = (addr[0] << (bitpos & 7)) | (addr[1] >> (8 - (bitpos & 7)));
			bitpos += 8;
			*outp++ = code;

			addr = inp + (bitpos >> 3);
			code = (addr[0] << (bitpos & 7)) | (addr[1] >> (8 - (bitpos & 7)));
			bitpos += 8;
			*outp++ = code;

			col += 2;
		}

		while (col < width) {
			/* get bitcode from bitstream */
			addr = inp + (bitpos >> 3);
			code = (addr[0] << (bitpos & 7)) | (addr[1] >> (8 - (bitpos & 7)));

			/* update bit position */
			bitpos += table[code].len;

			/* calculate pixel value */
			val = table[code].val;
			if (!table[code].is_abs) {
				/* value is relative to top and left pixel */
				if (col < 2) {
					/* left column: relative to top pixel */
					val += outp[-2*width];
				}
				else if (row < 2) {
					/* top row: relative to left pixel */
					val += outp[-2];
				}
				else {
					/* main area: average of left pixel and top pixel */
					val += (outp[-2] + outp[-2*width]) / 2;
					
				}
			}

			/* store pixel */
			*outp++ = CLIP(val);
			col++;
		}
	}
}
static void tv8532_preprocess(struct spca50x_frame *myframe)
{
/* we should received a whole frame with header and EOL marker
in myframe->data and return a GBRG pattern in frame->tmpbuffer
 sequence 2bytes header the Alternate pixels bayer GB 4 bytes
 Alternate pixels bayer RG 4 bytes EOL */
 int width = myframe->hdrwidth;
 int height =myframe->hdrheight;
 int src = 0;
 unsigned char *dst = myframe->tmpbuffer;
 unsigned char *data = myframe->data;
 int i;
 int seq1,seq2;
 
 /* precompute where is the good bayer line */
 if((((data[src+3]+ data[src+width+7]) >>1 )+(data[src+4]>>2)+(data[src+width+6]>>1)) >= 
    (((data[src+2]+data[src+width+6]) >>1)+(data[src+3]>>2)+(data[src+width+5]>>1))){
 	seq1 = 3;
 	seq2 = 4;
 } else {
 	seq1 = 2;
 	seq2 = 5;
 }
 for(i=0; i < height/2; i++){
 	src += seq1;
	memcpy(dst,&myframe->data[src],width);
	src += (width + 3);
	dst += width;
	memcpy(dst,&myframe->data[src],width);
	src += (width + seq2);
	dst += width;	
 }
}
/****************************************************************/
/**************       huffman decoder             ***************/
/****************************************************************/

static int fillbits (struct in *, int, unsigned int);
static int dec_rec2 (struct in *, struct dec_hufftbl *, int *, int, int);

static struct comp comps[MAXCOMP] = {
	{0x01, 0x22, 0x00},
	{0x02, 0x11, 0x01},
	{0x03, 0x11, 0x01},
	{0x00, 0x00, 0x00}
};

static struct scan dscans[MAXCOMP];

static unsigned char quant[4][64];

static struct dec_hufftbl dhuff[4];

#define dec_huffdc (dhuff + 0)
#define dec_huffac (dhuff + 2)
#define M_RST0	0xd0

static struct in in;

int dquant[3][64];

static struct jpginfo info;


static int
fillbits (struct in *in, int le, unsigned int bi)
{
	int b;
	int m;
	if (in->marker) {
		if (le <= 16)
			in->bits = bi << 16, le += 16;
		return le;
	}
	while (le <= 24) {
		b = *in->p++;
		if(in->omitescape){
			if (b == 0xff && (m = *in->p++) != 0) {
				in->marker = m;
				if (le <= 16)
					bi = bi << 16, le += 16;
				break;
			}
		}
		bi = bi << 8 | b;
		le += 8;
	}
	in->bits = bi;		/* tmp... 2 return values needed */
	return le;
}

#define LEBI_GET(in)	(le = in->left, bi = in->bits)
#define LEBI_PUT(in)	(in->left = le, in->bits = bi)

#define GETBITS(in, n) (					\
  (le < (n) ? le = fillbits(in, le, bi), bi = in->bits : 0),	\
  (le -= (n)),							\
  bi >> le & ((1 << (n)) - 1)					\
)

#define UNGETBITS(in, n) (	\
  le += (n)			\
)

static void dec_initscans(void)
{
	int i;
	info.ns = 3; // HARDCODED  here
	info.nm = info.dri + 1; // macroblock count
	info.rm = M_RST0;
	for (i = 0; i < info.ns; i++)
		dscans[i].dc = 0;