int main(int argc, char **argv)
{
int ret;
int i;
while(1){
//-------------------------------------------
ret=video_fb_init_preview();
switch (ret)//不同等级的清理------
{
case 1:
close(video_fd);
printf("clean level 1.\n");
break;
case 2: for(i=0;i<3;i++)
{
if(-1==munmap(buffers[i].start,buffers[i].length))
printf("munmap error:%d \n",i);
}
close(video_fd);
printf("clean level 2.\n");
break;
case 3: fb_munmap(fbdev.fb_mem, fbdev.fb_size); //释放framebuffer映射
close(fb); //关闭Framebuffer设备
for(i=0;i<3;i++)
{
if(-1==munmap(buffers[i].start,buffers[i].length))
printf("munmap error:%d \n",i);
}
close(video_fd);
printf("clean level 3.\n");
break;
default:printf("unkown return .\n");
break;
}
exit(1); //去除quit时进入死循环
}
return 0;
}
/************ function implementation ********************/
int main(int argc, char *argv[])
{
/*
* declaration for jpeg decompression
*/
struct jpeg_decompress_struct cinfo;
struct jpeg_error_mgr jerr;
FILE *infile;
unsigned char *buffer;
/*
* declaration for framebuffer device
*/
int fbdev;
char *fb_device;
unsigned char *fbmem;
unsigned int screensize;
unsigned int fb_width;
unsigned int fb_height;
unsigned int fb_depth;
unsigned int x;
unsigned int y;
/*
* check auguments
*/
/*if (argc != 2) {
usage("insuffient auguments");
exit(-1);
}*/
/*
* open framebuffer device
*/
if((fb_device = getenv("FRAMEBUFFER")) == NULL)
{
fb_device = FB_DEV;
}
fbdev = fb_open(fb_device);
/*
* get status of framebuffer device
*/
fb_stat(fbdev, &fb_width, &fb_height, &fb_depth);
printf("%d ", fb_width);
printf("%d ", fb_height);
printf("%d\n", fb_depth);
/*
* map framebuffer device to shared memory
*/
screensize = fb_width * fb_height * fb_depth / 8;
fbmem = fb_mmap(fbdev, screensize);
if(fbmem == 0)
{
printf("fb mmap error");
}
/*open input jpeg file */
char jpgname[32] = {0};
int jpgcnt = 0;
// SystemSetBlankInterVal(0);
while(1)
{
//for(jpgcnt = 0; jpgcnt < 10; jpgcnt++)
{
/*
* init jpeg decompress object error handler
*/
sprintf(jpgname, "%s","./picture.jpg");
//sprintf(jpgname, "/var/run/%d.jpg", jpgcnt);
printf("begint to display %s\n", jpgname);
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_decompress(&cinfo);
if((infile = fopen(jpgname, "rb+")) == NULL)
{
fprintf(stderr, "open %s failed\n", "1.jpg");
exit(-1);
}
/*
* bind jpeg decompress object to infile
*/
jpeg_stdio_src(&cinfo, infile);
/*
* read jpeg header
*/
jpeg_read_header(&cinfo, TRUE);
/*
* decompress process.
* note: after jpeg_start_decompress() is called
* the dimension infomation will be known,
* so allocate memory buffer for scanline immediately
*/
jpeg_start_decompress(&cinfo);
/*if ((cinfo.output_width > fb_width) ||
(cinfo.output_height > fb_height)) {
printf("too large JPEG file,cannot display\n");
return (-1);
}*/
buffer = (unsigned char *) malloc(cinfo.output_width *
cinfo.output_components);
y = 0;
while(cinfo.output_scanline < cinfo.output_height)
{
jpeg_read_scanlines(&cinfo, &buffer, 1);
if(fb_depth == 16)
{
unsigned short color;
for(x = 0; x < cinfo.output_width; x++)
{
color = RGB888toRGB565(buffer[x * 3],
buffer[x * 3 + 1]
, buffer[x * 3 + 2]);
fb_pixel(fbmem, fb_width, fb_height, x, y, color);
}
}
else if(fb_depth == 24)
{
memcpy((unsigned char *) fbmem + y * fb_width * 3,
buffer, cinfo.output_width * cinfo.output_components);
}
y++; // next scanline
}
/*
* finish decompress, destroy decompress object
*/
jpeg_finish_decompress(&cinfo);
jpeg_destroy_decompress(&cinfo);
/*
* release memory buffer
*/
free(buffer);
/*
* close jpeg inputing file
*/
fclose(infile);
usleep(400000);
}
}
/*
* unmap framebuffer's shared memory
*/
fb_munmap(fbmem, screensize);
/*
* close framebuffer device
*/
fb_close(fbdev);
return (0);
}
