path: root/psxdev/vlc.c

#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include "bs.h"

#define	SOFT

#define	CODE1(a,b,c)	(((a)<<10)|((b)&0x3ff)|((c)<<16))
/* run, level, bit */
#define	CODE(a,b,c)		CODE1(a,b,c+1),CODE1(a,-b,c+1)
#define	CODE0(a,b,c)	CODE1(a,b,c),CODE1(a,b,c)
#define	CODE2(a,b,c)	CODE1(a,b,c+1),CODE1(a,b,c+1)
#define	RUNOF(a)	((a)>>10)
#define	VALOF(a)	((short)((a)<<6)>>6)
#define	BITOF(a)	((a)>>16)
#define	EOB	0xfe00
#define	ESCAPE_CODE	CODE1(63,0,6)
#define	EOB_CODE	CODE1(63,512,2)

/*
	DC code
	Y			U,V
0	100			00	 		0
1	00x			01x			-1,1
2	01xx		10xx		-3,-2,2,3
3	101xxx		110xxx		-7..-4,4..7
4	110xxxx		1110		-15..-8,8..15
5	1110xxxxx	11110		-31..-16,16..31
6	11110xxxxxx	111110		-63..-32,32..63
7	111110		1111110		-127..-64,64..127
8	1111110		11111110	-255..-128,128..255
	7+8			8+8
*/

/*
	This table based on MPEG2DEC by MPEG Software Simulation Group
*/

/* Table B-14, DCT coefficients	table zero,
* codes	0100 ... 1xxx (used	for	all	other coefficients)
*/
static const Uint32 VLCtabnext[12*2] =	{
	CODE(0,2,4),  CODE(2,1,4),	CODE2(1,1,3),  CODE2(1,-1,3),
	CODE0(63,512,2), CODE0(63,512,2), CODE0(63,512,2), CODE0(63,512,2),	/*EOB*/
	CODE2(0,1,2),  CODE2(0,1,2),	CODE2(0,-1,2),  CODE2(0,-1,2)
};

/* Table B-14, DCT coefficients	table zero,
* codes	000001xx ... 00111xxx
*/
static const Uint32 VLCtab0[60*2] = {
	CODE0(63,0,6), CODE0(63,0,6),CODE0(63,0,6), CODE0(63,0,6), /* ESCAPE */
	CODE2(2,2,7), CODE2(2,-2,7), CODE2(9,1,7), CODE2(9,-1,7),
	CODE2(0,4,7), CODE2(0,-4,7), CODE2(8,1,7), CODE2(8,-1,7),
	CODE2(7,1,6), CODE2(7,1,6), CODE2(7,-1,6), CODE2(7,-1,6),
	CODE2(6,1,6), CODE2(6,1,6), CODE2(6,-1,6), CODE2(6,-1,6),
	CODE2(1,2,6), CODE2(1,2,6), CODE2(1,-2,6), CODE2(1,-2,6),
	CODE2(5,1,6), CODE2(5,1,6), CODE2(5,-1,6), CODE2(5,-1,6),
	CODE(13,1,8), CODE(0,6,8), CODE(12,1,8), CODE(11,1,8),
	CODE(3,2,8), CODE(1,3,8), CODE(0,5,8), CODE(10,1,8),
	CODE2(0,3,5), CODE2(0,3,5), CODE2(0,3,5), CODE2(0,3,5),
	CODE2(0,-3,5), CODE2(0,-3,5), CODE2(0,-3,5), CODE2(0,-3,5),
	CODE2(4,1,5), CODE2(4,1,5), CODE2(4,1,5), CODE2(4,1,5),
	CODE2(4,-1,5), CODE2(4,-1,5), CODE2(4,-1,5), CODE2(4,-1,5),
	CODE2(3,1,5), CODE2(3,1,5), CODE2(3,1,5), CODE2(3,1,5),
	CODE2(3,-1,5), CODE2(3,-1,5), CODE2(3,-1,5), CODE2(3,-1,5)
};

/* Table B-14, DCT coefficients	table zero,
* codes	0000001000 ... 0000001111
*/
static const Uint32 VLCtab1[8*2] =	{
	CODE(16,1,10), CODE(5,2,10), CODE(0,7,10), CODE(2,3,10),
	CODE(1,4,10), CODE(15,1,10), CODE(14,1,10),	CODE(4,2,10)
};

/* Table B-14/15, DCT coefficients table zero /	one,
* codes	000000010000 ... 000000011111
*/
static const Uint32 VLCtab2[16*2] = {
	CODE(0,11,12), CODE(8,2,12), CODE(4,3,12), CODE(0,10,12),
	CODE(2,4,12), CODE(7,2,12),	CODE(21,1,12), CODE(20,1,12),
	CODE(0,9,12), CODE(19,1,12), CODE(18,1,12),	CODE(1,5,12),
	CODE(3,3,12), CODE(0,8,12),	CODE(6,2,12), CODE(17,1,12)
};

/* Table B-14/15, DCT coefficients table zero /	one,
* codes	0000000010000 ... 0000000011111
*/
static const Uint32 VLCtab3[16*2] = {
	CODE(10,2,13), CODE(9,2,13), CODE(5,3,13), CODE(3,4,13),
	CODE(2,5,13), CODE(1,7,13),	CODE(1,6,13), CODE(0,15,13),
	CODE(0,14,13), CODE(0,13,13), CODE(0,12,13), CODE(26,1,13),
	CODE(25,1,13), CODE(24,1,13), CODE(23,1,13), CODE(22,1,13)
};

/* Table B-14/15, DCT coefficients table zero /	one,
* codes	00000000010000 ... 00000000011111
*/
static const Uint32 VLCtab4[16*2] = {
	CODE(0,31,14), CODE(0,30,14), CODE(0,29,14), CODE(0,28,14),
	CODE(0,27,14), CODE(0,26,14), CODE(0,25,14), CODE(0,24,14),
	CODE(0,23,14), CODE(0,22,14), CODE(0,21,14), CODE(0,20,14),
	CODE(0,19,14), CODE(0,18,14), CODE(0,17,14), CODE(0,16,14)
};

/* Table B-14/15, DCT coefficients table zero /	one,
* codes	000000000010000	...	000000000011111
*/
static const Uint32 VLCtab5[16*2] = {
	CODE(0,40,15), CODE(0,39,15), CODE(0,38,15), CODE(0,37,15),
	CODE(0,36,15), CODE(0,35,15), CODE(0,34,15), CODE(0,33,15),
	CODE(0,32,15), CODE(1,14,15), CODE(1,13,15), CODE(1,12,15),
	CODE(1,11,15), CODE(1,10,15), CODE(1,9,15),	CODE(1,8,15)
};

/* Table B-14/15, DCT coefficients table zero /	one,
* codes	0000000000010000 ... 0000000000011111
*/
static const Uint32 VLCtab6[16*2] = {
	CODE(1,18,16), CODE(1,17,16), CODE(1,16,16), CODE(1,15,16),
	CODE(6,3,16), CODE(16,2,16), CODE(15,2,16),	CODE(14,2,16),
	CODE(13,2,16), CODE(12,2,16), CODE(11,2,16), CODE(31,1,16),
	CODE(30,1,16), CODE(29,1,16), CODE(28,1,16), CODE(27,1,16)
};

/*
	DC code
	Y				U,V
0	100				00	 				0
1	00x				01x					-1,1
2	01xx			10xx				-3,-2,2,3
3	101xxx			110xxx				-7..-4,4..7
4	110xxxx			1110xxxx			-15..-8,8..15
5	1110xxxxx		11110xxxxx			-31..-16,16..31
6	11110xxxxxx		111110xxxxxx		-63..-32,32..63
7	111110xxxxxxx	1111110xxxxxxx		-127..-64,64..127
8	1111110xxxxxxxx	11111110xxxxxxxx	-255..-128,128..255
*/

static const Uint32 DC_Ytab0[48] = {
	CODE1(0,-1,3),CODE1(0,-1,3),CODE1(0,-1,3),CODE1(0,-1,3),
	CODE1(0,-1,3),CODE1(0,-1,3),CODE1(0,-1,3),CODE1(0,-1,3),
	CODE1(0,1,3),CODE1(0,1,3),CODE1(0,1,3),CODE1(0,1,3),
	CODE1(0,1,3),CODE1(0,1,3),CODE1(0,1,3),CODE1(0,1,3),

	CODE1(0,-3,4),CODE1(0,-3,4),CODE1(0,-3,4),CODE1(0,-3,4),
	CODE1(0,-2,4),CODE1(0,-2,4),CODE1(0,-2,4),CODE1(0,-2,4),
	CODE1(0,2,4),CODE1(0,2,4),CODE1(0,2,4),CODE1(0,2,4),
	CODE1(0,3,4),CODE1(0,3,4),CODE1(0,3,4),CODE1(0,3,4),

	CODE1(0,0,3),CODE1(0,0,3),CODE1(0,0,3),CODE1(0,0,3),
	CODE1(0,0,3),CODE1(0,0,3),CODE1(0,0,3),CODE1(0,0,3),
	CODE1(0,-7,6),CODE1(0,-6,6),CODE1(0,-5,6),CODE1(0,-4,6),
	CODE1(0,4,6),CODE1(0,5,6),CODE1(0,6,6),CODE1(0,7,6),

};

static const Uint32 DC_UVtab0[56] = {
	CODE1(0,0,2),CODE1(0,0,2),CODE1(0,0,2),CODE1(0,0,2),
	CODE1(0,0,2),CODE1(0,0,2),CODE1(0,0,2),CODE1(0,0,2),
	CODE1(0,0,2),CODE1(0,0,2),CODE1(0,0,2),CODE1(0,0,2),
	CODE1(0,0,2),CODE1(0,0,2),CODE1(0,0,2),CODE1(0,0,2),

	CODE1(0,-1,3),CODE1(0,-1,3),CODE1(0,-1,3),CODE1(0,-1,3),
	CODE1(0,-1,3),CODE1(0,-1,3),CODE1(0,-1,3),CODE1(0,-1,3),
	CODE1(0,1,3),CODE1(0,1,3),CODE1(0,1,3),CODE1(0,1,3),
	CODE1(0,1,3),CODE1(0,1,3),CODE1(0,1,3),CODE1(0,1,3),

	CODE1(0,-3,4),CODE1(0,-3,4),CODE1(0,-3,4),CODE1(0,-3,4),
	CODE1(0,-2,4),CODE1(0,-2,4),CODE1(0,-2,4),CODE1(0,-2,4),
	CODE1(0,2,4),CODE1(0,2,4),CODE1(0,2,4),CODE1(0,2,4),
	CODE1(0,3,4),CODE1(0,3,4),CODE1(0,3,4),CODE1(0,3,4),

	CODE1(0,-7,6),CODE1(0,-6,6),CODE1(0,-5,6),CODE1(0,-4,6),
	CODE1(0,4,6),CODE1(0,5,6),CODE1(0,6,6),CODE1(0,7,6),
};

#define	DCTSIZE2	64

/* decode one intra	coded MPEG-1 block */

#define	Show_Bits(N)	(bitbuf>>(32-(N)))
/* 最小有効bit 17 bit*/

#define	Flush_Buffer(N) {bitbuf <<=(N);incnt +=(N);while(incnt>=0) {bitbuf |= Get_Word()<<incnt;incnt-=16;}}

#define	Init_Buffer() {bitbuf = (mdec_bs[0]<<16)|(mdec_bs[1]);mdec_bs+=2;incnt = -16;}

#define	Get_Word()	(*mdec_bs++)
#define	Printf	printf


int DecDCTvlc(Uint16 *mdec_bs,Uint16 *mdec_rl)
{
/*	Uint16 *mdec_bs = mdecbs,*mdec_rl = mdecrl */
	Uint16 *rl_end;
	Uint32 bitbuf;
	int incnt; /* 16-有効bit数 x86=char risc = long */
	int q_code;
	int type,n;
	int last_dc[3];

/* BS_HDR  Uint16 rlsize,magic,ver,q_scale */

	/* printf("%04x,%04x,",mdec_bs[0],mdec_bs[1]); */
	*(long*)mdec_rl=*(long*)mdec_bs;
	mdec_rl+=2;
	rl_end = mdec_rl+(int)mdec_bs[0]*2;
	q_code = (mdec_bs[2]<<10); /* code = q */
	type = mdec_bs[3];
	mdec_bs+=4;

	Init_Buffer();

	n = 0;
	last_dc[0]=last_dc[1]=last_dc[2] = 0;
	while(mdec_rl<rl_end) {
	  Uint32 code2;
		/* DC */
	  if (type==2) {
		code2 = Show_Bits(10)|(10<<16); /* DC code */
	  } else {
		code2 = Show_Bits(6);
		if (n>=2) {
			/* Y */
			if (code2<48) {
				code2 = DC_Ytab0[code2];
				code2 = (code2&0xffff0000)|((last_dc[2]+=VALOF(code2)*4)&0x3ff);
			} else {
				int nbit,val;
				int bit = 3;
				while(Show_Bits(bit)&1) { bit++;}
				bit++;
				nbit = bit*2-1;
				val = Show_Bits(nbit)&((1<<bit)-1);
				if ((val&(1<<(bit-1)))==0)
					val -= (1<<bit)-1;
				val = (last_dc[2]+=val*4);
				code2 = (nbit<<16) | (val&0x3ff);
			}
			/* printf("%d ",last_dc[2]); */
		} else {
			/* U,V */
			if (code2<56) {
				code2 = DC_UVtab0[code2];
				code2 = (code2&0xffff0000)|((last_dc[n]+=VALOF(code2)*4)&0x3ff);
			} else {
				int nbit,val;
				int bit = 4;
				while(Show_Bits(bit)&1) { bit++;}
				nbit = bit*2;
				val = Show_Bits(nbit)&((1<<bit)-1);
				if ((val&(1<<(bit-1)))==0)
					val -= (1<<bit)-1;
				val = (last_dc[n]+=val*4);
				code2 = (nbit<<16) | (val&0x3ff);
			}
			/* printf("%d ",last_dc[n]); */
		}
		if (++n==6) n=0;
	  }
	/*	printf("%d ",VALOF(code2)); */
	  code2 |= q_code;

		/* AC */
	  while(mdec_rl<rl_end){
/*		Uint32 code; */
#define	code code2
#define	SBIT	17
		*mdec_rl++=code2;
		Flush_Buffer(BITOF(code2));
		code = Show_Bits(SBIT);
		if      (code>=1<<(SBIT- 2)) {
			code2 = VLCtabnext[(code>>12)-8];
			if (code2==EOB_CODE) break;
		}
		else if (code>=1<<(SBIT- 6)) {
			code2 = VLCtab0[(code>>8)-8];
			if (code2==ESCAPE_CODE) {
				Flush_Buffer(6); /* ESCAPE len */
				code2 = Show_Bits(16)| (16<<16);
			}
		}
		else if (code>=1<<(SBIT- 7)) code2 = VLCtab1[(code>>6)-16];
		else if (code>=1<<(SBIT- 8)) code2 = VLCtab2[(code>>4)-32];
		else if (code>=1<<(SBIT- 9)) code2 = VLCtab3[(code>>3)-32];
		else if (code>=1<<(SBIT-10)) code2 = VLCtab4[(code>>2)-32];
		else if (code>=1<<(SBIT-11)) code2 = VLCtab5[(code>>1)-32];
		else if (code>=1<<(SBIT-12)) code2 = VLCtab6[(code>>0)-32];
		else {
			do {
				*mdec_rl++=EOB;
			} while(mdec_rl<rl_end);
			return 0;
		}
	  }
	  *mdec_rl++=code2; /* EOB code */
	  Flush_Buffer(2); /* EOB bitlen */
	}
	return 0;
}



/* this table is based on djpeg by Independent Jpeg Group */

static const int aanscales[DCTSIZE2] = {
	  /* precomputed values scaled up by 14 bits */
	  16384, 22725, 21407, 19266, 16384, 12873,  8867,  4520,
	  22725, 31521, 29692, 26722, 22725, 17855, 12299,  6270,
	  21407, 29692, 27969, 25172, 21407, 16819, 11585,  5906,
	  19266, 26722, 25172, 22654, 19266, 15137, 10426,  5315,
	  16384, 22725, 21407, 19266, 16384, 12873,  8867,  4520,
	  12873, 17855, 16819, 15137, 12873, 10114,  6967,  3552,
	   8867, 12299, 11585, 10426,  8867,  6967,  4799,  2446,
	   4520,  6270,  5906,  5315,  4520,  3552,  2446,  1247
};

extern unsigned char zscan[DCTSIZE2];

typedef struct {
	int iqtab[DCTSIZE2];
	const unsigned char *iq_y;
	Uint16 *mdec_rl,*rl_end;
	int mdec_mode;
} bs_context_t;

void iqtab_init(bs_context_t *ctxt)
{
#define CONST_BITS 14
#define	IFAST_SCALE_BITS 2
	int i;
	for(i=0;i<DCTSIZE2;i++) {
		ctxt->iqtab[i] =ctxt->iq_y[i]*aanscales[i]>>(CONST_BITS-IFAST_SCALE_BITS);
	}
}

#define	BLOCK	long

extern void IDCT(BLOCK *blk,int k);

Uint16* rl2blk(bs_context_t *ctxt, BLOCK *blk,Uint16 *mdec_rl)
{
	int i,k,q_scale,rl;
	memset(blk,0,6*DCTSIZE2*sizeof(BLOCK));
	for(i=0;i<6;i++) {
		rl = *mdec_rl++;
		q_scale = RUNOF(rl);
		blk[0] = ctxt->iqtab[0]*VALOF(rl);
		k = 0;
		for(;;) {
			rl = *mdec_rl++;
			if (rl==EOB) break;
			k += RUNOF(rl)+1;
			blk[zscan[k]] = ctxt->iqtab[zscan[k]]*q_scale*VALOF(rl)/8;
		}

		IDCT(blk,k+1);
		
		blk+=DCTSIZE2;
	}
	return mdec_rl;
}

#define	RGB15(r,g,b)	( (((b)&0xf8)<<7)|(((g)&0xf8)<<2)|((r)>>3) )

#define	ROUND(r)	bs_roundtbl[(r)+256]
#if 1
#define	SHIFT	12
#define	toFIX(a)	(int)((a)*(1<<SHIFT))
#define	toINT(a)	((a)>>SHIFT)
#define	FIX_1	toFIX(1)
#define	MULR(a)	toINT((a)*toFIX(1.402))
#define	MULG(a)	toINT((a)*toFIX(-0.3437))
#define	MULG2(a)	toINT((a)*toFIX(-0.7143))
#define	MULB(a)	toINT((a)*toFIX(1.772))
#else
#define	MULR(a)	0
#define	MULG(a)	0
#define	MULG2(a)	0
#define	MULB(a)	0
#endif


/*
int ROUND(int r)
{
	if (r<0) return 0;
	else if (r>255) return 255;
	else return r;
}
*/

extern Uint8 bs_roundtbl[256*3];

static void yuv2rgb15(BLOCK *blk,Uint16 *image)
{
	int x,yy;
	BLOCK *yblk = blk+DCTSIZE2*2;
	for(yy=0;yy<16;yy+=2,blk+=4,yblk+=8,image+=8+16) {
		if (yy==8) yblk+=DCTSIZE2;
		for(x=0;x<4;x++,blk++,yblk+=2,image+=2) {
			int r0,b0,g0,y;
			r0 = MULR(blk[DCTSIZE2]); /* cr */
			g0 = MULG(blk[0])+MULG2(blk[DCTSIZE2]);
			b0 = MULB(blk[0]); /* cb */
			y = yblk[0]+128;
			image[0] = RGB15(ROUND(r0+y),ROUND(g0+y),ROUND(b0+y));
			y = yblk[1]+128+4;
			image[1] = RGB15(ROUND(r0+y),ROUND(g0+y),ROUND(b0+y));
			y = yblk[8]+128+6;
			image[16] = RGB15(ROUND(r0+y),ROUND(g0+y),ROUND(b0+y));
			y = yblk[9]+128+2;
			image[17] = RGB15(ROUND(r0+y),ROUND(g0+y),ROUND(b0+y));
			r0 = MULR(blk[4+DCTSIZE2]);
			g0 = MULG(blk[4])+MULG2(blk[4+DCTSIZE2]);
			b0 = MULB(blk[4]);
			y = yblk[DCTSIZE2+0]+128;
			image[8+0] = RGB15(ROUND(r0+y),ROUND(g0+y),ROUND(b0+y));
			y = yblk[DCTSIZE2+1]+128+4;
			image[8+1] = RGB15(ROUND(r0+y),ROUND(g0+y),ROUND(b0+y));
			y = yblk[DCTSIZE2+8]+128+6;
			image[8+16] = RGB15(ROUND(r0+y),ROUND(g0+y),ROUND(b0+y));
			y = yblk[DCTSIZE2+9]+128+2;
			image[8+17] = RGB15(ROUND(r0+y),ROUND(g0+y),ROUND(b0+y));
		}
	}
}

enum {B, G, R};

static void yuv2rgb24(BLOCK *blk,Uint8 image[][3])
{
	int x,yy;
	BLOCK *yblk = blk+DCTSIZE2*2;
	for(yy=0;yy<16;yy+=2,blk+=4,yblk+=8,image+=8+16) {
		if (yy==8) yblk+=DCTSIZE2;
		for(x=0;x<4;x++,blk++,yblk+=2,image+=2) {
			int r0,b0,g0,y;
			r0 = MULR(blk[DCTSIZE2]); /* cr */
			g0 = MULG(blk[0])+MULG2(blk[DCTSIZE2]);
			b0 = MULB(blk[0]); /* cb */
			y = yblk[0]+128;
			image[0][R] = ROUND(r0+y);
			image[0][G] = ROUND(g0+y);
			image[0][B] = ROUND(b0+y);
			y = yblk[1]+128;
			image[1][R] = ROUND(r0+y);
			image[1][G] = ROUND(g0+y);
			image[1][B] = ROUND(b0+y);
			y = yblk[8]+128;
			image[16][R] = ROUND(r0+y);
			image[16][G] = ROUND(g0+y);
			image[16][B] = ROUND(b0+y);
			y = yblk[9]+128;
			image[17][R] = ROUND(r0+y);
			image[17][G] = ROUND(g0+y);
			image[17][B] = ROUND(b0+y);

			r0 = MULR(blk[4+DCTSIZE2]);
			g0 = MULG(blk[4])+MULG2(blk[4+DCTSIZE2]);
			b0 = MULB(blk[4]);
			y = yblk[DCTSIZE2+0]+128;
			image[8+0][R] = ROUND(r0+y);
			image[8+0][G] = ROUND(g0+y);
			image[8+0][B] = ROUND(b0+y);
			y = yblk[DCTSIZE2+1]+128;
			image[8+1][R] = ROUND(r0+y);
			image[8+1][G] = ROUND(g0+y);
			image[8+1][B] = ROUND(b0+y);
			y = yblk[DCTSIZE2+8]+128;
			image[8+16][R] = ROUND(r0+y);
			image[8+16][G] = ROUND(g0+y);
			image[8+16][B] = ROUND(b0+y);
			y = yblk[DCTSIZE2+9]+128;
			image[8+17][R] = ROUND(r0+y);
			image[8+17][G] = ROUND(g0+y);
			image[8+17][B] = ROUND(b0+y);
		}
	}
}

static void DecDCTReset(bs_context_t *ctxt, int mode)
{
	iqtab_init(ctxt);
}

static void DecDCTin(bs_context_t *ctxt, Uint16 *mdecrl,int mode)
{
	mdecrl+=2;
	ctxt->mdec_rl = mdecrl;
	ctxt->rl_end = mdecrl+mdecrl[-2]*2;
	ctxt->mdec_mode = mode;
}

static void DecDCTout(bs_context_t *ctxt, Uint16 *image,int size)
{
	BLOCK blk[DCTSIZE2*6];
	int blocksize=16*16;
	if (ctxt->mdec_mode) blocksize = 16*16*3/2;
	for(;size>0;size-=blocksize/2,image+=blocksize) {
		ctxt->mdec_rl = rl2blk(ctxt,blk,ctxt->mdec_rl);
		if (ctxt->mdec_mode==0) yuv2rgb15(blk,image);
		else yuv2rgb24(blk,image);
	}
}

void bs_decode_rgb24 (
	unsigned char *outbuf,	/* output RGB bytes (width*height*3) */
	bs_header_t *img,		/* input BS image */
	int width, int height,	/* dimension of BS image */
	const unsigned char *myiqtab
	)
{
	unsigned short *buf2 = (unsigned short *) outbuf;
	unsigned short *bufp = (unsigned short *) img;
	bs_context_t ctxt;
	unsigned short *rl,*image;
	int slice;
	/* int rlsize; */
	int mode;
	int x,y;
	int height2 = (height+15)&~15;
	int w;

	ctxt.iq_y = myiqtab ? myiqtab : bs_iqtab();
	mode=1;
	w=24;
	width = width*3/2;

	image = (unsigned short *) malloc (height2*w*sizeof(short));
	rl = (unsigned short *) malloc ((bufp[0]+2)*sizeof(long));

	DecDCTReset(&ctxt,0);
	DecDCTvlc(bufp,rl);
	DecDCTin(&ctxt,rl,mode);

	slice = height2*w/2;

	for(x=0;x<width;x+=w)
	{
		Uint16 *dst,*src;
		DecDCTout(&ctxt,image,slice);
		src = image;
 		dst = buf2+x+(0)*width;
 		for(y=height-1;y>=0;y--)
 		{
 			memcpy(dst,src,w*2);
 			src+=w;
 			dst+=width;
 		}
	}

	free (image);
	free (rl);
}

void bs_decode_rgb15 (
	unsigned short *outbuf,	/* output RGB bytes (width*height*2) */
	bs_header_t *img,		/* input BS image */
	int width, int height,	/* dimension of BS image */
	const unsigned char *myiqtab
	)
{
	unsigned short *buf2 = (unsigned short *) outbuf;
	unsigned short *bufp = (unsigned short *) img;
	bs_context_t ctxt;
	unsigned short *rl,*image;
	int slice;
	/* int rlsize; */
	int mode;
	int x,y;
	int height2 = (height+15)&~15;
	int w;

	ctxt.iq_y = myiqtab ? myiqtab : bs_iqtab();
	mode=0;
	w=24;

	image = (unsigned short *) malloc (height2*w*sizeof(short));
	rl = (unsigned short *) malloc ((bufp[0]+2)*sizeof(long));

	DecDCTReset(&ctxt,0);
	DecDCTvlc(bufp,rl);
	DecDCTin(&ctxt,rl,mode);

	slice = height2*w/2;

	for(x=0;x<width;x+=w)
	{
		Uint16 *dst,*src;
		DecDCTout(&ctxt,image,slice);
		src = image;
		dst = buf2+x+(height-1)*width;
		for(y=height-1;y>=0;y--)
		{
			memcpy(dst,src,w*2);
			src+=w;
			dst-=width;
		}
	}

	free (image);
	free (rl);
}