Created
August 30, 2018 08:07
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fbcp for rpi
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#include <stdio.h> | |
#include <syslog.h> | |
#include <sys/fcntl.h> | |
#include <sys/ioctl.h> | |
#include <linux/fb.h> | |
#include <sys/mman.h> | |
#include <bcm_host.h> | |
int process() { | |
DISPMANX_DISPLAY_HANDLE_T display; | |
DISPMANX_MODEINFO_T display_info; | |
DISPMANX_RESOURCE_HANDLE_T screen_resource; | |
VC_IMAGE_TRANSFORM_T transform; | |
uint32_t image_prt; | |
VC_RECT_T rect1; | |
int ret; | |
int fbfd = 0; | |
char *fbp = 0; | |
struct fb_var_screeninfo vinfo; | |
struct fb_fix_screeninfo finfo; | |
bcm_host_init(); | |
display = vc_dispmanx_display_open(0); | |
if (!display) { | |
syslog(LOG_ERR, "Unable to open primary display"); | |
return -1; | |
} | |
ret = vc_dispmanx_display_get_info(display, &display_info); | |
if (ret) { | |
syslog(LOG_ERR, "Unable to get primary display information"); | |
return -1; | |
} | |
syslog(LOG_INFO, "Primary display is %d x %d", display_info.width, display_info.height); | |
fbfd = open("/dev/fb1", O_RDWR); | |
if (fbfd == -1) { | |
syslog(LOG_ERR, "Unable to open secondary display"); | |
return -1; | |
} | |
if (ioctl(fbfd, FBIOGET_FSCREENINFO, &finfo)) { | |
syslog(LOG_ERR, "Unable to get secondary display information"); | |
return -1; | |
} | |
if (ioctl(fbfd, FBIOGET_VSCREENINFO, &vinfo)) { | |
syslog(LOG_ERR, "Unable to get secondary display information"); | |
return -1; | |
} | |
syslog(LOG_INFO, "Second display is %d x %d %dbps\n", vinfo.xres, vinfo.yres, vinfo.bits_per_pixel); | |
screen_resource = vc_dispmanx_resource_create(VC_IMAGE_RGB565, vinfo.xres, vinfo.yres, &image_prt); | |
if (!screen_resource) { | |
syslog(LOG_ERR, "Unable to create screen buffer"); | |
close(fbfd); | |
vc_dispmanx_display_close(display); | |
return -1; | |
} | |
fbp = (char*) mmap(0, finfo.smem_len, PROT_READ | PROT_WRITE, MAP_SHARED, fbfd, 0); | |
if (fbp <= 0) { | |
syslog(LOG_ERR, "Unable to create mamory mapping"); | |
close(fbfd); | |
ret = vc_dispmanx_resource_delete(screen_resource); | |
vc_dispmanx_display_close(display); | |
return -1; | |
} | |
vc_dispmanx_rect_set(&rect1, 0, 0, vinfo.xres, vinfo.yres); | |
while (1) { | |
ret = vc_dispmanx_snapshot(display, screen_resource, 0); | |
vc_dispmanx_resource_read_data(screen_resource, &rect1, fbp, vinfo.xres * vinfo.bits_per_pixel / 8); | |
usleep(25 * 1000); | |
} | |
munmap(fbp, finfo.smem_len); | |
close(fbfd); | |
ret = vc_dispmanx_resource_delete(screen_resource); | |
vc_dispmanx_display_close(display); | |
} | |
int main(int argc, char **argv) { | |
setlogmask(LOG_UPTO(LOG_DEBUG)); | |
openlog("fbcp", LOG_NDELAY | LOG_PID, LOG_USER); | |
return process(); | |
} | |
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