在ARM上对正在播放的视频文件进行截屏时挂掉啦, 但是截取静态图片是成功的。以下是代码, 求高手指教!~
struct fb_fix_screeninfo finfo;
struct fb_var_screeninfo vinfo;
uchar *frameBuffer = NULL;
long int screensize = 0;
(fb0里是普通静态画面的缓冲设备, fb1是视频播放时的缓冲设备)
qint32 fd = open("/dev/graphics/fb1", O_RDONLY);
if (fd < 0) {
fd = open("/dev/fb", O_RDONLY);
if (fd < 0) {
return false;
}
}
if (ioctl(fd, FBIOGET_FSCREENINFO, &finfo)<0) {
return false;
}
if (ioctl(fd, FBIOGET_VSCREENINFO, &vinfo)<0) {
return false;
}
screensize = vinfo.xres * vinfo.yres * vinfo.bits_per_pixel / 8;
int curViewOffset = vinfo.yoffset/480;
frameBuffer = (uchar *) mmap(0, /* start */
screensize, /* bytes */
PROT_READ, /* prot */
MAP_SHARED, /* flags */
fd, /* fd */
screensize * curViewOffset /* offset */);
if (MAP_FAILED == frameBuffer) {
return false;
}
只要对frameBuffer进行读取就死机!