embear-engineering / drm-framebuffer Goto Github PK

.../home/drm-framebuffer # dd if=/dev/urandom | ./drm-framebuffer -d /dev/dri/card0 -c DSI-1
Could not get master role for DRM.

and How to use ffmpeg? To get image or videos off of a drm based device such as my phone

$ ./drm-framebuffer -d /dev/dri/by-path/platform-gpu-card -c HMDI-A-1
Could not find preferred resolution

when I use -r:

$ ./drm-framebuffer -d /dev/dri/by-path/platform-gpu-card -c HMDI-A-1 -r
1280x720

Hey there,

I ran into your code by chance, compiled it for my pi, it works great!

Reason why I'm here: I have 2 displays on a headless raspberry pi, I just couldn't get fbi to send its output to a specific drm connector, as both screens appear under the same framebuffer with the default raspberry pi driver. Your code did the trick.

I was thinking, wouldn't it be nice if drm-framebuffer could refresh the framebuffer as soon as a new image is passed to it? Right now it collects the framebuffer data, displays it, and then wait until it gets killed. I'll try to see if I can tweak your code and do a pull when I get a chance.

Thanks.

I had a crash in release_framebuffer() when I try to use an unconnected connector.

Using valgrind, I tracked it down to the use of uninitialized data. I will provide a pull-request with a simple fix.

$ valgrind ./drm-framebuffer -d /dev/dri/card0 -c HDMI-A-1
==51253== Memcheck, a memory error detector
==51253== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==51253== Using Valgrind-3.18.1 and LibVEX; rerun with -h for copyright info
==51253== Command: ./drm-framebuffer -d /dev/dri/card0 -c HDMI-A-1
==51253== 
Could not find preferred resolution
==51253== Conditional jump or move depends on uninitialised value(s)
==51253==    at 0x10AF0E: release_framebuffer (framebuffer.c:49)
==51253==    by 0x10B523: get_framebuffer (framebuffer.c:189)
==51253==    by 0x10AE84: main (main.c:276)

Does this require a specific version of the kernel? I'm trying to XCC but no luck so far.

make
aarch64-poky-linux-gcc -march=armv8-a+crc+crypto -fstack-protector-strong -O2 -D_FORTIFY_SOURCE=2 -Wformat -Wformat-security -Werror=format-security --sysroot=/opt/fsl-imx-wayland/5.15-kirkstone/sysroots/armv8a-poky-linux -I "../opt/fsl-imx-wayland/5.15-kirkstone/sysroots/armv8a-poky-linux/usr/include/" -c main.c -O2 -pipe -g -feliminate-unused-debug-types
aarch64-poky-linux-gcc -march=armv8-a+crc+crypto -fstack-protector-strong -O2 -D_FORTIFY_SOURCE=2 -Wformat -Wformat-security -Werror=format-security --sysroot=/opt/fsl-imx-wayland/5.15-kirkstone/sysroots/armv8a-poky-linux -O2 -pipe -g -feliminate-unused-debug-types -o drm-framebuffer -I "../opt/fsl-imx-wayland/5.15-kirkstone/sysroots/armv8a-poky-linux/usr/include/" main.o framebuffer.o -Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed -Wl,-z,relro,-z,now
/opt/fsl-imx-wayland/5.15-kirkstone/sysroots/x86_64-pokysdk-linux/usr/libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/11.2.0/real-ld: main.o: in function fill_framebuffer_from_stdin': /home/serstech/drm-framebuffer/main.c:194: undefined reference to drmSetMaster'
/opt/fsl-imx-wayland/5.15-kirkstone/sysroots/x86_64-pokysdk-linux/usr/libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/11.2.0/real-ld: /home/serstech/drm-framebuffer/main.c:200: undefined reference to drmModeSetCrtc' /opt/fsl-imx-wayland/5.15-kirkstone/sysroots/x86_64-pokysdk-linux/usr/libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/11.2.0/real-ld: /home/serstech/drm-framebuffer/main.c:201: undefined reference to drmModeSetCrtc'
/opt/fsl-imx-wayland/5.15-kirkstone/sysroots/x86_64-pokysdk-linux/usr/libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/11.2.0/real-ld: /home/serstech/drm-framebuffer/main.c:202: undefined reference to drmDropMaster' /opt/fsl-imx-wayland/5.15-kirkstone/sysroots/x86_64-pokysdk-linux/usr/libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/11.2.0/real-ld: main.o: in function get_resolution':
/home/serstech/drm-framebuffer/main.c:123: undefined reference to drmModeGetResources' /opt/fsl-imx-wayland/5.15-kirkstone/sysroots/x86_64-pokysdk-linux/usr/libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/11.2.0/real-ld: /home/serstech/drm-framebuffer/main.c:134: undefined reference to drmModeGetConnectorCurrent'
/opt/fsl-imx-wayland/5.15-kirkstone/sysroots/x86_64-pokysdk-linux/usr/libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/11.2.0/real-ld: /home/serstech/drm-framebuffer/main.c:144: undefined reference to drmModeFreeConnector' /opt/fsl-imx-wayland/5.15-kirkstone/sysroots/x86_64-pokysdk-linux/usr/libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/11.2.0/real-ld: main.o: in function list_resources':
/home/serstech/drm-framebuffer/main.c:59: undefined reference to drmModeGetResources' /opt/fsl-imx-wayland/5.15-kirkstone/sysroots/x86_64-pokysdk-linux/usr/libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/11.2.0/real-ld: /home/serstech/drm-framebuffer/main.c:71: undefined reference to drmModeGetConnectorCurrent'
/opt/fsl-imx-wayland/5.15-kirkstone/sysroots/x86_64-pokysdk-linux/usr/libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/11.2.0/real-ld: /home/serstech/drm-framebuffer/main.c:79: undefined reference to drmModeGetEncoder' /opt/fsl-imx-wayland/5.15-kirkstone/sysroots/x86_64-pokysdk-linux/usr/libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/11.2.0/real-ld: /home/serstech/drm-framebuffer/main.c:85: undefined reference to drmModeFreeEncoder'
/opt/fsl-imx-wayland/5.15-kirkstone/sysroots/x86_64-pokysdk-linux/usr/libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/11.2.0/real-ld: /home/serstech/drm-framebuffer/main.c:86: undefined reference to drmModeFreeConnector' /opt/fsl-imx-wayland/5.15-kirkstone/sysroots/x86_64-pokysdk-linux/usr/libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/11.2.0/real-ld: /home/serstech/drm-framebuffer/main.c:105: undefined reference to drmModeFreeResources'
/opt/fsl-imx-wayland/5.15-kirkstone/sysroots/x86_64-pokysdk-linux/usr/libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/11.2.0/real-ld: main.o: in function get_resolution': /home/serstech/drm-framebuffer/main.c:170: undefined reference to drmModeFreeConnector'
/opt/fsl-imx-wayland/5.15-kirkstone/sysroots/x86_64-pokysdk-linux/usr/libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/11.2.0/real-ld: /home/serstech/drm-framebuffer/main.c:171: undefined reference to drmModeFreeResources' /opt/fsl-imx-wayland/5.15-kirkstone/sysroots/x86_64-pokysdk-linux/usr/libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/11.2.0/real-ld: framebuffer.o: in function release_framebuffer':
/home/serstech/drm-framebuffer/framebuffer.c:51: undefined reference to drmSetMaster' /opt/fsl-imx-wayland/5.15-kirkstone/sysroots/x86_64-pokysdk-linux/usr/libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/11.2.0/real-ld: /home/serstech/drm-framebuffer/framebuffer.c:54: undefined reference to drmModeSetCrtc'
/opt/fsl-imx-wayland/5.15-kirkstone/sysroots/x86_64-pokysdk-linux/usr/libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/11.2.0/real-ld: /home/serstech/drm-framebuffer/framebuffer.c:55: undefined reference to drmModeFreeCrtc' /opt/fsl-imx-wayland/5.15-kirkstone/sysroots/x86_64-pokysdk-linux/usr/libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/11.2.0/real-ld: /home/serstech/drm-framebuffer/framebuffer.c:61: undefined reference to drmModeFreeConnector'
/opt/fsl-imx-wayland/5.15-kirkstone/sysroots/x86_64-pokysdk-linux/usr/libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/11.2.0/real-ld: /home/serstech/drm-framebuffer/framebuffer.c:58: undefined reference to drmModeGetFB' /opt/fsl-imx-wayland/5.15-kirkstone/sysroots/x86_64-pokysdk-linux/usr/libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/11.2.0/real-ld: /home/serstech/drm-framebuffer/framebuffer.c:58: undefined reference to drmModeFreeFB'
/opt/fsl-imx-wayland/5.15-kirkstone/sysroots/x86_64-pokysdk-linux/usr/libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/11.2.0/real-ld: framebuffer.o: in function get_framebuffer': /home/serstech/drm-framebuffer/framebuffer.c:86: undefined reference to drmModeGetResources'
/opt/fsl-imx-wayland/5.15-kirkstone/sysroots/x86_64-pokysdk-linux/usr/libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/11.2.0/real-ld: /home/serstech/drm-framebuffer/framebuffer.c:97: undefined reference to drmModeGetConnectorCurrent' /opt/fsl-imx-wayland/5.15-kirkstone/sysroots/x86_64-pokysdk-linux/usr/libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/11.2.0/real-ld: /home/serstech/drm-framebuffer/framebuffer.c:107: undefined reference to drmModeFreeConnector'
/opt/fsl-imx-wayland/5.15-kirkstone/sysroots/x86_64-pokysdk-linux/usr/libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/11.2.0/real-ld: /home/serstech/drm-framebuffer/framebuffer.c:141: undefined reference to drmModeAddFB' /opt/fsl-imx-wayland/5.15-kirkstone/sysroots/x86_64-pokysdk-linux/usr/libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/11.2.0/real-ld: /home/serstech/drm-framebuffer/framebuffer.c:148: undefined reference to drmModeGetEncoder'
/opt/fsl-imx-wayland/5.15-kirkstone/sysroots/x86_64-pokysdk-linux/usr/libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/11.2.0/real-ld: /home/serstech/drm-framebuffer/framebuffer.c:156: undefined reference to drmModeGetCrtc' /opt/fsl-imx-wayland/5.15-kirkstone/sysroots/x86_64-pokysdk-linux/usr/libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/11.2.0/real-ld: /home/serstech/drm-framebuffer/framebuffer.c:163: undefined reference to drmIoctl'
/opt/fsl-imx-wayland/5.15-kirkstone/sysroots/x86_64-pokysdk-linux/usr/libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/11.2.0/real-ld: /home/serstech/drm-framebuffer/framebuffer.c:177: undefined reference to drmDropMaster' /opt/fsl-imx-wayland/5.15-kirkstone/sysroots/x86_64-pokysdk-linux/usr/libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/11.2.0/real-ld: /home/serstech/drm-framebuffer/framebuffer.c:186: undefined reference to drmModeFreeEncoder'
/opt/fsl-imx-wayland/5.15-kirkstone/sysroots/x86_64-pokysdk-linux/usr/libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/11.2.0/real-ld: /home/serstech/drm-framebuffer/framebuffer.c:186: undefined reference to drmModeFreeEncoder' /opt/fsl-imx-wayland/5.15-kirkstone/sysroots/x86_64-pokysdk-linux/usr/libexec/aarch64-poky-linux/gcc/aarch64-poky-linux/11.2.0/real-ld: /home/serstech/drm-framebuffer/framebuffer.c:186: undefined reference to drmModeFreeEncoder'
collect2: error: ld returned 1 exit status
make: *** [Makefile:14: all] Error 1