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@Miouyouyou
Miouyouyou / drm-prime-dumb-kms.c
Last active October 24, 2023 06:28
Simple example showing how to use DRM to : allocate a Dumb buffer on the GPU, use it as a framebuffer, use this CRTC on the currently connected screen (expecting 1 connected screen), export the buffer, reimport it implicitly with mmap and write in it.
// This will works on Embedded GPU that implements .gem_prime_mmap like Rockchip ones.
// This will fail on most DRM drivers for GPU with dedicated memory as they tend to NOT implement .gem_prime_mmap.
#include <stdio.h>
#include <libdrm/drm.h>
#include <stdint.h>
#include <sys/mman.h>
#include <string.h>

Enabling debug output for v4l2 drivers

To change your current console loglevel to debug

echo 8 > /proc/sys/kernel/printk

First, you can enable v4l2 core debug logs. Check what driver is associated with which device file:

ls /dev/video/by-name/ -l

lrwxrwxrwx 1 root root 12 Jan 1 03:00 coda -> ../../video2

@olasd
olasd / stream_to_youtube.sh
Created March 28, 2014 19:58
Stream video to youtube via ffmpeg
#! /bin/bash
#
# Diffusion youtube avec ffmpeg
# Configurer youtube avec une résolution 720p. La vidéo n'est pas scalée.
VBR="2500k" # Bitrate de la vidéo en sortie
FPS="30" # FPS de la vidéo en sortie
QUAL="medium" # Preset de qualité FFMPEG
YOUTUBE_URL="rtmp://a.rtmp.youtube.com/live2" # URL de base RTMP youtube
@sehe
sehe / Makefile
Last active January 16, 2023 08:29
Boost shared memory lockfree circular buffer queue
all:consumer producer
CPPFLAGS+=-std=c++03 -Wall -pedantic
CPPFLAGS+=-g -O0
CPPFLAGS+=-isystem ~/custom/boost/
LDFLAGS+=-L ~/custom/boost/stage/lib/ -Wl,-rpath,/home/sehe/custom/boost/stage/lib
LDFLAGS+=-lboost_system -lrt -lpthread
%:%.cpp
@ajmontag
ajmontag / gpio.c
Created November 4, 2012 19:24
A C program that listens for button presses on a Beaglebone GPIO pin and reports the press duration.
/**
* Title: gpio.c
*
* Author: Andrew Montag
* ajmontag@gmail.com
* sites.google.com/site/andrewmontag
*
* Licence: Boost Software Licence - Verison 1.0
* http://www.boost.org/users/license.html
*