qt_v4l2.tar.gz_V4L2 qt_qt 采集_qt+v4l2_qt视频显示‘_v4l2 QT

/******************************************************************************* # 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; g