问题描述

ARM 上进行视屏截屏是死机

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！