基于qt的视频采集与显示

#include<stdio.h> #include <unistd.h> #include <fcntl.h> #include <string.h> #include "camera.h" Video::Video(char *DeviceName):fd(-1) { Addr = 0; fd = ::open(DeviceName, O_RDONLY); if (fd < 0) { printf("cannot open video device\n"); } Width = 640; Height = 512; BPP = 16; Size = Width * Height; Addr = new unsigned char <:Size*BPP/8:> ; data_buf = new unsigned char <:Size*3:> ; } bool Video::FetchPicture(void) { int count = ::read(fd, Addr, Size*BPP/8); if (count not_eq (Size*BPP/8)) { printf("error in fetching picture from video\n"); return false; } return true; } unsigned char * Video::VideoToData(void) { const unsigned char bmpFileHead[0x36]={ 0x42,0x4d,0x36,0xc0,0x03,0x00,0x00,0x00,0x00,0x00,0x36,0x00,0x00,0x00,0x28,0x00, 0x00,0x00,0x40,0x01,0x00,0x00,0x00,0x01,0x00,0x00,0x01,0x00,0x18,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0xc4,0x0e,0x00,0x00,0xc4,0x0e,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00}; long num,lineth=0x36; int col; short *tempdata; memcpy(data_buf,bmpFileHead,0x36); for(col=0;col<Height;col++) //scale=0.5 { if(col%2) { for(num=0;num<Width;num++) { if(num%2) { tempdata=(short *) &(Addr[(col*Width+Width-num-1)*2]); data_buf[lineth++]=(unsigned char) ( ((*tempdata)&0x001f )*8 ); data_buf[lineth++]=(unsigned char) ( (((*tempdata)>>5)&0x003f )*4 ); data_buf[lineth++]=(unsigned char) ( (((*tempdata)>>11)&0x001f )*8 ); } } } } return data_buf; } Video::~Video(void) { ::close(fd); fd = -1; delete<::> Addr; delete<::> data_buf; Addr = 0; data_buf = 0; }