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utils.c
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/*******************************************************************************
# luvcview: Sdl video Usb Video Class grabber . #
#This package work with the Logitech UVC based webcams with the mjpeg feature. #
#All the decoding is in user space with the embedded jpeg decoder #
#. #
# Copyright (C) 2005 2006 Laurent Pinchart && Michel Xhaard #
# #
# 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 #
# #
*******************************************************************************/
#include "utils.h"
#include "color.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <linux/types.h>
#include <string.h>
#include <fcntl.h>
#include <wait.h>
#include <time.h>
#include <limits.h>
#include "huffman.h"
#define ISHIFT 11
#define IFIX(a) ((int)((a) * (1 << ISHIFT) + .5))
#ifndef __P
# define __P(x) x
#endif
/* special markers */
#define M_BADHUFF -1
#define M_EOF 0x80
struct jpeg_decdata {
int dcts[6 * 64 + 16];
int out[64 * 6];
int dquant[3][64];
};
struct in {
unsigned char *p;
unsigned int bits;
int left;
int marker;
int (*func) __P((void *));
void *data;
};
/*********************************/
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];
};
static int huffman_init(void);
static void decode_mcus
__P((struct in *, int *, int, struct scan *, int *));
static int dec_readmarker __P((struct in *));
static void dec_makehuff
__P((struct dec_hufftbl *, int *, unsigned char *));
static void setinput __P((struct in *, unsigned char *));
/*********************************/
#undef PREC
#define PREC int
static void idctqtab __P((unsigned char *, PREC *));
inline static void idct(int *in, int *out, int *quant, long off, int max);
int is_huffman(unsigned char *buf);
/*********************************/
static void yuv420pto422(int * out,unsigned char *pic,int width);
static void yuv422pto422(int * out,unsigned char *pic,int width);
static void yuv444pto422(int * out,unsigned char *pic,int width);
static void yuv400pto422(int * out,unsigned char *pic,int width);
typedef void (*ftopict) ( int *out, unsigned char *pic, int width) ;
/*********************************/
#define M_SOI 0xd8
#define M_APP0 0xe0
#define M_DQT 0xdb
#define M_SOF0 0xc0
#define M_DHT 0xc4
#define M_DRI 0xdd
#define M_SOS 0xda
#define M_RST0 0xd0
#define M_EOI 0xd9
#define M_COM 0xfe
static unsigned char *datap;
static int getbyte(void)
{
return *datap++;
}
static int getword(void)
{
int c1, c2;
c1 = *datap++;
c2 = *datap++;
return c1 << 8 | c2;
}
struct comp {
int cid;
int hv;
int tq;
};
#define MAXCOMP 4
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 */
};
static struct jpginfo info;
static struct comp comps[MAXCOMP];
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)
static struct in in;
static int readtables(int till, int *isDHT)
{
int m, l, i, j, lq, pq, tq;
int tc, th, tt;
for (;;) {
if (getbyte() != 0xff)
return -1;
if ((m = getbyte()) == till)
break;
switch (m) {
case 0xc2:
return 0;
case M_DQT:
//printf("find DQT \n");
lq = getword();
while (lq > 2) {
pq = getbyte();
tq = pq & 15;
if (tq > 3)
return -1;
pq >>= 4;
if (pq != 0)
return -1;
for (i = 0; i < 64; i++)
quant[tq][i] = getbyte();
lq -= 64 + 1;
}
break;
case M_DHT:
//printf("find DHT \n");
l = getword();
while (l > 2) {
int hufflen[16], k;
unsigned char huffvals[256];
tc = getbyte();
th = tc & 15;
tc >>= 4;
tt = tc * 2 + th;
if (tc > 1 || th > 1)
return -1;
for (i = 0; i < 16; i++)
hufflen[i] = getbyte();
l -= 1 + 16;
k = 0;
for (i = 0; i < 16; i++) {
for (j = 0; j < hufflen[i]; j++)
huffvals[k++] = getbyte();
l -= hufflen[i];
}
dec_makehuff(dhuff + tt, hufflen, huffvals);
}
*isDHT= 1;
break;
case M_DRI:
printf("find DRI \n");
l = getword();
info.dri = getword();
break;
default:
l = getword();
while (l-- > 2)
getbyte();
break;
}
}
return 0;
}
static void dec_initscans(void)
{
int i;
info.nm = info.dri + 1;
info.rm = M_RST0;
for (i = 0; i < info.ns; i++)
dscans[i].dc = 0;
}
static int dec_checkmarker(void)
{
int i;
if (dec_readmarker(&in) != info.rm)
return -1;
info.nm = info.dri;
info.rm = (info.rm + 1) & ~0x08;
for (i = 0; i < info.ns; i++)
dscans[i].dc = 0;
return 0;
}
int jpeg_decode(unsigned char **pic, unsigned char *buf, int *width,
int *height)
{
struct jpeg_decdata *decdata;
int i, j, m, tac, tdc;
int intwidth, intheight;
int mcusx, mcusy, mx, my;
int ypitch ,xpitch,bpp,pitch,x,y;
int mb;
int max[6];
ftopict convert;
int err = 0;
int isInitHuffman = 0;
decdata = (struct jpeg_decdata *) malloc(sizeof(struct jpeg_decdata));
if (!decdata) {
err = -1;
goto error;
}
if (buf == NULL) {
err = -1;
goto error;
}
datap = buf;
if (getbyte() != 0xff) {
err = ERR_NO_SOI;
goto error;
}
if (getbyte() != M_SOI) {
err = ERR_NO_SOI;
goto error;
}
if (readtables(M_SOF0, &isInitHuffman)) {
err = ERR_BAD_TABLES;
goto error;
}
getword();
i = getbyte();
if (i != 8) {
err = ERR_NOT_8BIT;
goto error;
}
intheight = getword();
intwidth = getword();
if ((intheight & 7) || (intwidth & 7)) {
err = ERR_BAD_WIDTH_OR_HEIGHT;
goto error;
}
info.nc = getbyte();
if (info.nc > MAXCOMP) {
err = ERR_TOO_MANY_COMPPS;
goto error;
}
for (i = 0; i < info.nc; i++) {
int h, v;
comps[i].cid = getbyte();
comps[i].hv = getbyte();
v = comps[i].hv & 15;
h = comps[i].hv >> 4;
comps[i].tq = getbyte();
if (h > 3 || v > 3) {
err = ERR_ILLEGAL_HV;
goto error;
}
if (comps[i].tq > 3) {
err = ERR_QUANT_TABLE_SELECTOR;
goto error;
}
}
if (readtables(M_SOS,&isInitHuffman)) {
err = ERR_BAD_TABLES;
goto error;
}
getword();
info.ns = getbyte();
if (!info.ns){
printf("info ns %d/n",info.ns);
err = ERR_NOT_YCBCR_221111;
goto error;
}
for (i = 0; i < info.ns; i++) {
dscans[i].cid = getbyte();
tdc = getbyte();
tac = tdc & 15;
tdc >>= 4;
if (tdc > 1 || tac > 1) {
err = ERR_QUANT_TABLE_SELECTOR;
goto error;
}
for (j = 0; j < info.nc; j++)
if (comps[j].cid == dscans[i].cid)
break;
if (j == info.nc) {
err = ERR_UNKNOWN_CID_IN_SCAN;
goto error;
}
dscans[i].hv = comps[j].hv;
dscans[i].tq = comps[j].tq;
dscans[i].hudc.dhuff = dec_huffdc + tdc;
dscans[i].huac.dhuff = dec_huffac + tac;
}
i = getbyte();
j = getbyte();
m = getbyte();
if (i != 0 || j != 63 || m != 0) {
printf("hmm FW error,not seq DCT ??\n");
}
// printf("ext huffman table %d \n",isInitHuffman);
if(!isInitHuffman) {
if(huffman_init() < 0)
return -ERR_BAD_TABLES;
}
/*
if (dscans[0].cid != 1 || dscans[1].cid != 2 || dscans[2].cid != 3) {
err = ERR_NOT_YCBCR_221111;
goto error;
}
if (dscans[1].hv != 0x11 || dscans[2].hv != 0x11) {
err = ERR_NOT_YCBCR_221111;
goto error;
}
*/
/* if internal width and external are not the same or heigth too
and pic not allocated realloc the good size and mark the change
need 1 macroblock line more ?? */
if (intwidth != *width || intheight != *height || *pic == NULL) {
*width = intwidth;
*height = intheight;
// BytesperPixel 2 yuyv , 3 rgb24
*pic =
(unsigned char *) realloc((unsigned char *) *pic,
(size_t) intwidth * (intheight +
8) * 2);
}
switch (dscans[0].hv) {
case 0x22: // 411
mb=6;
mcusx = *width >> 4;
mcusy = *height >> 4;
bpp=2;
xpitch = 16 * bpp;
pitch = *width * bpp; // YUYV out
ypitch = 16 * pitch;
convert = yuv420pto422;
break;
case 0x21: //422
// printf("find 422 %dx%d\n",*width,*height);
mb=4;
mcusx = *width >> 4;
mcusy = *height >> 3;
bpp=2;
xpitch = 16 * bpp;
pitch = *width * bpp; // YUYV out
ypitch = 8 * pitch;
convert = yuv422pto422;
break;
case 0x11: //444
mcusx = *width >> 3;
mcusy = *height >> 3;
bpp=2;
xpitch = 8 * bpp;
pitch = *width * bpp; // YUYV out
ypitch = 8 * pitch;
if (info.ns==1) {
mb = 1;
convert = yuv400pto422;
} else {
mb=3;
convert = yuv444pto422;
}
break;
default:
err = ERR_NOT_YCBCR_221111;
goto error;
break;
}
idctqtab(quant[dscans[0].tq], decdata->dquant[0]);
idctqtab(quant[dscans[1].tq], decdata->dquant[1]);
idctqtab(quant[dscans[2].tq], decdata->dquant[2]);
setinput(&in, datap);
dec_initscans();
dscans[0].next = 2;
dscans[1].next = 1;
dscans[2].next = 0; /* 4xx encoding */
for (my = 0,y=0; my < mcusy; my++,y+=ypitch) {
for (mx = 0,x=0; mx < mcusx; mx++,x+=xpitch) {
if (info.dri && !--info.nm)
if (dec_checkmarker()) {
err = ERR_WRONG_MARKER;
goto error;
}
switch (mb){
case 6: {
decode_mcus(&in, decdata->dcts, mb, dscans, max);
idct(decdata->dcts, decdata->out, decdata->dquant[0],
IFIX(128.5), max[0]);
idct(decdata->dcts + 64, decdata->out + 64,
decdata->dquant[0], IFIX(128.5), max[1]);
idct(decdata->dcts + 128, decdata->out + 128,
decdata->dquant[0], IFIX(128.5), max[2]);
idct(decdata->dcts + 192, decdata->out + 192,
decdata->dquant[0], IFIX(128.5), max[3]);
idct(decdata->dcts + 256, decdata->out + 256,
decdata->dquant[1], IFIX(0.5), max[4]);
idct(decdata->dcts + 320, decdata->out + 320,
decdata->dquant[2], IFIX(0.5), max[5]);
} break;
case 4:
{
decode_mcus(&in, decdata->dcts, mb, dscans, max);
idct(decdata->dcts, decdata->out, decdata->dquant[0],
IFIX(128.5), max[0]);
idct(decdata->dcts + 64, decdata->out + 64,
decdata->dquant[0], IFIX(128.5), max[1]);
idct(decdata->dcts + 128, decdata->out + 256,
decdata->dquant[1], IFIX(0.5), max[4]);
idct(decdata->dcts + 192, decdata->out + 320,
decdata->dquant[2], IFIX(0.5), max[5]);
}
break;
case 3:
decode_mcus(&in, decdata->dcts, mb, dscans, max);
idct(decdata->dcts, decdata->out, decdata->dquant[0],
IFIX(128.5), max[0]);
idct(decdata->dcts + 64, decdata->out + 256,
decdata->dquant[1], IFIX(0.5), max[4]);
idct(decdata->dcts + 128, decdata->out + 320,
decdata->dquant[2], IFIX(0.5), max[5]);
break;
case 1:
decode_mcus(&in, decdata->dcts, mb, dscans, max);
idct(decdata->dcts, decdata->out, decdata->dquant[0],
IFIX(128.5), max[0]);
break;
} // switch enc411
convert(decdata->out,*pic+y+x,pitch);
}
}
m = dec_readmarker(&in);
if (m != M_EOI) {
err = ERR_NO_EOI;
goto error;
}
if (decdata)
free(decdata);
return 0;
error:
if (decdata)
free(decdata);
return err;
}
/****************************************************************/
/************** huffman decoder ***************/
/****************************************************************/
static int huffman_init(void)
{ int tc, th, tt;
const unsigned char *ptr= JPEGHuffmanTable ;
int i, j, l;
l = JPG_HUFFMAN_TABLE_LENGTH ;
while (l > 0) {
int hufflen[16], k;
unsigned char huffvals[256];
tc = *ptr++;
th = tc & 15;
tc >>= 4;
tt = tc * 2 + th;
if (tc > 1 || th > 1)
return -ERR_BAD_TABLES;
for (i = 0; i < 16; i++)
hufflen[i] = *ptr++;
l -= 1 + 16;
k = 0;
for (i = 0; i < 16; i++) {
for (j = 0; j < hufflen[i]; j++)
huffvals[k++] = *ptr++;
l -= hufflen[i];
}
dec_makehuff(dhuff + tt, hufflen, huffvals);
}
return 0;
}
static int fillbits __P((struct in *, int, unsigned int));
static int dec_rec2
__P((struct in *, struct dec_hufftbl *, int *, int, int));
static void setinput(in, p)
struct in *in;
unsigned char *p;
{
in->p = p;
in->left = 0;
in->bits = 0;
in->marker = 0;
}
static int fillbits(in, le, bi)
struct in *in;
int le;
unsigned int bi;
{
int b, m;
if (in->marker) {
if (le <= 16)
in->bits = bi << 16, le += 16;
return le;
}
while (le <= 24) {
b = *in->p++;
if (b == 0xff && (m = *in->p++) != 0) {
if (m == M_EOF) {
if (in->func && (m = in->func(in->data)) == 0)
continue;
}
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;
}
static int dec_readmarker(in)
struct in *in;
{
int m;
in->left = fillbits(in, in->left, in->bits);
if ((m = in->marker) == 0)
return 0;
in->left = 0;
in->marker = 0;
return m;
}
#define LEBI_DCL int le, bi
#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 int dec_rec2(in, hu, runp, c, i)
struct in *in;
struct dec_hufftbl *hu;
int *runp;
int c, i;
{
LEBI_DCL;
LEBI_GET(in);
if (i) {
UNGETBITS(in, i & 127);
*runp = i >> 8 & 15;
i >>= 16;
} else {
for (i = DECBITS;
(c = ((c << 1) | GETBITS(in, 1))) >= (hu->maxcode[i]); i++);
if (i >= 16) {
in->marker = M_BADHUFF;
return 0;
}
i = hu->vals[hu->valptr[i] + c - hu->maxcode[i - 1] * 2];
*runp = i >> 4;
i &= 15;
}
if (i == 0) { /* sigh, 0xf0 is 11 bit */
LEBI_PUT(in);
return 0;
}
/* receive part */
c = GETBITS(in, i);
if (c < (1 << (i - 1)))
c += (-1 << i) + 1;
LEBI_PUT(in);
return c;
}
#define DEC_REC(in, hu, r, i) ( \
r = GETBITS(in, DECBITS), \
i = hu->llvals[r], \
i & 128 ? \
( \
UNGETBITS(in, i & 127), \
r = i >> 8 & 15, \
i >> 16 \
) \
: \
( \
LEBI_PUT(in), \
i = dec_rec2(in, hu, &r, r, i), \
LEBI_GET(in), \
i \
) \
)
static void decode_mcus(in, dct, n, sc, maxp)
struct in *in;
int *dct;
int n;
struct scan *sc;
int *maxp;
{
struct dec_hufftbl *hu;
int i, r, t;
LEBI_DCL;
memset(dct, 0, n * 64 * sizeof(*dct));
LEBI_GET(in);
while (n-- > 0) {
hu = sc->hudc.dhuff;
*dct++ = (sc->dc += DEC_REC(in, hu, r, t));
hu = sc->huac.dhuff;
i = 63;
while (i > 0) {
t = DEC_REC(in, hu, r, t);
if (t == 0 && r == 0) {
dct += i;
break;
}
dct += r;
*dct++ = t;
i -= r + 1;
}
*maxp++ = 64 - i;
if (n == sc->next)
sc++;
}
LEBI_PUT(in);
}
static void dec_makehuff(hu, hufflen, huffvals)
struct dec_hufftbl *hu;
int *hufflen;
unsigned char *huffvals;
{
int code, k, i, j, d, x, c, v;
for (i = 0; i < (1 << DECBITS); i++)
hu->llvals[i] = 0;
/*
* llvals layout:
*
* value v already known, run r, backup u bits:
* vvvvvvvvvvvvvvvv 0000 rrrr 1 uuuuuuu
* value unknown, size b bits, run r, backup u bits:
* 000000000000bbbb 0000 rrrr 0 uuuuuuu
* value and size unknown:
* 0000000000000000 0000 0000 0 0000000
*/
code = 0;
k = 0;
for (i = 0; i < 16; i++, code <<= 1) { /* sizes */
hu->valptr[i] = k;
for (j = 0; j < hufflen[i]; j++) {
hu->vals[k] = *huffvals++;
if (i < DECBITS) {
c = code << (DECBITS - 1 - i);
v = hu->vals[k] & 0x0f; /* size */
for (d = 1 << (DECBITS - 1 - i); --d >= 0;) {
if (v + i < DECBITS) { /* both fit in table */
x = d >> (DECBITS - 1 - v - i);
if (v && x < (1 << (v - 1)))
x += (-1 << v) + 1;
x = x << 16 | (hu->vals[k] & 0xf0) << 4 |
(DECBITS - (i + 1 + v)) | 128;
} else
x = v << 16 | (hu->vals[k] & 0xf0) << 4 |
(DECBITS - (i + 1));
hu->llvals[c | d] = x;
}
}
code++;
k++;
}
hu->maxcode[i] = code;
}
hu->maxcode[16] = 0x20000; /* always terminate decode */
}
/****************************************************************/
/************** idct ***************/
/****************************************************************/
#define IMULT(a, b) (((a) * (b)) >> ISHIFT)
#define ITOINT(a) ((a) >> ISHIFT)
#define S22 ((PREC)IFIX(2 * 0.382683432))
#define C22 ((PREC)IFIX(2 * 0.923879532))
#define IC4 ((PREC)IFIX(1 / 0.707106781))
static unsigned char zig2[64] = {
0, 2, 3, 9, 10, 20, 21, 35,
14, 16, 25, 31, 39, 46, 50, 57,
5, 7, 12, 18, 23, 33, 37, 48,
27, 29, 41, 44, 52, 55, 59, 62,
15, 26, 30, 40, 45, 51, 56, 58,
1, 4, 8, 11, 19, 22, 34, 36,
28, 42, 43, 53, 54, 60, 61, 63,
6, 13, 17, 24, 32, 38, 47, 49
};
inline static void idct(int *in, int *out, int *quant, long off, int max)
{
long t0, t1, t2, t3, t4, t5, t6, t7; // t ;
long tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6;
long tmp[64], *tmpp;
int i, j, te;
unsigned char *zig2p;
t0 = off;
if (max == 1) {
t0 += in[0] * quant[0];
for (i = 0; i < 64; i++)
out[i] = ITOINT(t0);
return;
}
zig2p = zig2;
tmpp = tmp;
for (i = 0; i < 8; i++) {
j = *zig2p++;
t0 += in[j] * (long) quant[j];
j = *zig2p++;
t5 = in[j] * (long) quant[j];
j = *zig2p++;
t2 = in[j] * (long) quant[j];
j = *zig2p++;
t7 = in[j] * (long) quant[j];
j = *zig2p++;
t1 = in[j] * (long) quant[j];
j = *zig2p++;
t4 = in[j] * (long) quant[j];
j = *zig2p++;
t3 = in[j] * (long) quant[j];
j = *zig2p++;
t6 = in[j] * (long) quant[j];
if ((t1 | t2 | t3 | t4 | t5 | t6 | t7) == 0) {
tmpp[0 * 8] = t0;
tmpp[1 * 8] = t0;
tmpp[2 * 8] = t0;
tmpp[3 * 8] = t0;
tmpp[4 * 8] = t0;
tmpp[5 * 8] = t0;
tmpp[6 * 8] = t0;
tmpp[7 * 8] = t0;
tmpp++;
t0 = 0;
continue;
}
//IDCT;
tmp0 = t0 + t1;
t1 = t0 - t1;
tmp2 = t2 - t3;
t3 = t2 + t3;
tmp2 = IMULT(tmp2, IC4) - t3;
tmp3 = tmp0 + t3;
t3 = tmp0 - t3;
tmp1 = t1 + tmp2;
tmp2 = t1 - tmp2;
tmp4 = t4 - t7;
t7 = t4 + t7;
tmp5 = t5 + t6;
t6 = t5 - t6;
tmp6 = tmp5 - t7;
t7 = tmp5 + t7;
tmp5 = IMULT(tmp6, IC4);
tmp6 = IMULT((tmp4 + t6), S22);
tmp4 = IMULT(tmp4, (C22 - S22)) + tmp6;
t6 = IMULT(t6, (C22 + S22)) - tmp6;
t6 = t6 - t7;
t5 = tmp5 - t6;
t4 = tmp4 - t5;
tmpp[0 * 8] = tmp3 + t7; //t0;
tmpp[1 * 8] = tmp1 + t6; //t1;
tmpp[2 * 8] = tmp2 + t5; //t2;
tmpp[3 * 8] = t3 + t4; //t3;
tmpp[4 * 8] = t3 - t4; //t4;
tmpp[5 * 8] = tmp2 - t5; //t5;
tmpp[6 * 8] = tmp1 - t6; //t6;
tmpp[7 * 8] = tmp3 - t7; //t7;
tmpp++;
t0 = 0;
}
for (i = 0, j = 0; i < 8; i++) {
t0 = tmp[j + 0];
t1 = tmp[j + 1];
t2 = tmp[j + 2];
t3 = tmp[j + 3];
t4 = tmp[j + 4];
t5 = tmp[j + 5];
t6 = tmp[j + 6];
t7 = tmp[j + 7];
if ((t1 | t2 | t3 | t4 | t5 | t6 | t7) == 0) {
te = ITOINT(t0);
out[j + 0] = te;
out[j + 1] = te;
out[j + 2] = te;
out[j + 3] = te;
out[j + 4] = te;
out[j + 5] = te;
out[j + 6] = te;
out[j + 7] = te;
j += 8;
continue;
}
//IDCT;
tmp0 = t0 + t1;
t1 = t0 - t1;
tmp2 = t2 - t3;
t3 = t2 + t3;
tmp2 = IMULT(tmp2, IC4) - t3;
tmp3 = tmp0 + t3;
t3 = tmp0 - t3;
tmp1 = t1 + tmp2;
tmp2 = t1 - tmp2;
tmp4 = t4 - t7;
t7 = t4 + t7;
tmp5 = t5 + t6;
t6 = t5 - t6;
tmp6 = tmp5 - t7;
t7 = tmp5 + t7;
tmp5 = IMULT(tmp6, IC4);
tmp6 = IMULT((tmp4 + t6), S22);
tmp4 = IMULT(tmp4, (C22 - S22)) + tmp6;
t6 = IMULT(t6, (C22 + S22)) - tmp6;
t6 = t6 - t7;
t5 = tmp5 - t6;
t4 = tmp4 - t5;
out[j + 0] = ITOINT(tmp3 + t7);
out[j + 1] = ITOINT(tmp1 + t6);
out[j + 2] = ITOINT(tmp2 + t5);
out[j + 3] = ITOINT(t3 + t4);
out[j + 4] = ITOINT(t3 - t4);
out[j + 5] = ITOINT(tmp2 - t5);
out[j + 6] = ITOINT(tmp1 - t6);
out[j + 7] = ITOINT(tmp3 - t7);
j += 8;
}
}
static unsigned char zig[64] = {
0, 1, 5, 6, 14, 15, 27, 28,
2, 4, 7, 13, 16, 26, 29, 42,
3, 8, 12, 17, 25, 30, 41, 43,
9, 11, 18, 24, 31, 40, 44, 53,
10, 19, 23, 32, 39, 45, 52, 54,
20, 22, 33, 38, 46, 51, 55, 60,
21, 34, 37, 47, 50, 56, 59, 61,
35, 36, 48, 49, 57, 58, 62, 63
};
static PREC aaidct[8] = {
IFIX(0.3535533906), IFIX(0.4903926402),
IFIX(0.4619397663), IFIX(0.4157348062),
IFIX(0.3535533906), IFIX(0.2777851165),
IFIX(0.1913417162), IFIX(0.0975451610)
};
static void idctqtab(qin, qout)
unsigned char *qin;
PREC *qout;
{
int i, j;
for (i = 0; i < 8; i++)
for (j = 0; j < 8; j++)
qout[zig[i * 8 + j]] = qin[zig[i * 8 + j]] *
IMULT(aaidct[i], aaidct[j]);
}
#define FOUR_TWO_TWO 2 //Y00 Cb Y01 Cr
/* translate YUV422Packed to rgb24 */
unsigned int
Pyuv422torgb24(unsigned char * input_ptr, unsigned char * output_ptr, unsigned int image_width, unsigned int image_height)
{
unsigned int i, size;
unsigned char Y, Y1, U, V;
unsigned char *buff = input_ptr;
unsigned char *output_pt = output_ptr;
size = image_width * image_height /2;