Update .gitignore to exclude linter files

For now, only device scanning is working

.gitignore

@@ -1,54 +1,12 @@
 # ---> C
-# Prerequisites
-*.d
 
-# Object files
-*.o
-*.ko
-*.obj
-*.elf
+# Output folder
+bin
 
-# Linker output
-*.ilk
-*.map
-*.exp
+# Ctag files
+tags
 
-# Precompiled Headers
-*.gch
-*.pch
-
-# Libraries
-*.lib
-*.a
-*.la
-*.lo
-
-# Shared objects (inc. Windows DLLs)
-*.dll
-*.so
-*.so.*
-*.dylib
-
-# Executables
-*.exe
-*.out
-*.app
-*.i*86
-*.x86_64
-*.hex
-
-# Debug files
-*.dSYM/
-*.su
-*.idb
-*.pdb
-
-# Kernel Module Compile Results
-*.mod*
-*.cmd
-.tmp_versions/
-modules.order
-Module.symvers
-Mkfile.old
-dkms.conf
+# Linter files
+compile_commands.json
+.cache
 

Makefile

@@ -0,0 +1,164 @@
+# --- minimal linux makefile ------------------------------------------------- #
+# This makefile works on linux with options to crosscompile by changing the    #
+# TARGET option. By default, compile the defined application for the native    #
+# platform.                                                                    #
+#                                                                              #
+# Before use, make sure to adapt the parameters in the following sections      #
+# 	- project architecture : general folder layout                             #
+# 	- toolchain configuration : compiler to use and other little things        #
+# 	- defines settings : list of defines to pass to the compiler			   #
+# 	- general settings : include control and release options				   #
+# ---------------------------------------------------------------------------- #
+
+# --- project architecture
+# program name
+EXE_PREFIX=main
+# project folder architecture
+SRC=src
+BIN=bin
+INC=
+OBJ=$(BIN)/obj
+
+# --- toolchain configuration
+TARGET=
+CC=$(TARGET)gcc
+AS=$(TARGET)gcc -x assembler-with-cpp -c
+
+# --- defines settings
+#list all C defines here with -D before the name
+C_DEFS=
+#list all ASM defines here with -D before the name
+A_DEFS=
+#list all linker flags here with -l before the name
+LDFLAGS=-lavcodec -lavformat -lavutil -lavdevice -lv4l2
+
+# --- general settings
+# RELEASE=0 -> disable optimisation, then enable debug
+# RELEASE=1 -> enable optimisation, then disable debug
+RELEASE=0
+
+#-------------------------------------------------------------------------------
+# files discovery and paths solving
+# down here is black magic, you probably don't want to modify anything
+
+#list all directories, sort them and remove duplicates
+DIRS:=$(sort $(shell find . -type d))
+#find paths to src files from directory list
+SRC_PATHS=$(foreach DIR, $(SRC), $(filter ./$(DIR)%, $(DIRS)))
+
+#list c files
+C_FILES=$(foreach PATH, . $(SRC_PATHS), $(wildcard $(PATH)/*.c))
+#filter useless STmcube files
+ifeq ($(strip $(FILTER)), 1)
+    C_FILES:=$(filter-out %template.c, $(C_FILES))
+endif
+
+#list h files
+#H_FILES=$(foreach PATH, $(INC_PATHS), $(wildcard $(PATH)/*.h))
+#list asm files
+ASM_FILES=$(foreach PATH, . $(SRC_PATHS), $(wildcard $(PATH)/*.s))
+
+#separate main c file from other c files
+MAIN_C_FILES:=$(filter %$(EXE_PREFIX).c, $(C_FILES))
+C_FILES:=$(filter-out %$(EXE_PREFIX).c, $(C_FILES))
+
+#create new paths to store o files
+MAIN_OBJ_FILES=$(patsubst ./%.c, ./$(OBJ)/%.o, $(MAIN_C_FILES))
+OBJ_FILES=$(patsubst ./%.c, ./$(OBJ)/%.o, $(C_FILES)) \
+		  $(patsubst ./%.s, ./$(OBJ)/%.o, $(ASM_FILES))
+DEPEND_FILES=$(MAIN_OBJ_FILES:%.o,%.d)$(OBJ_FILES:%.o,%.d)
+
+#-------------------------------------------------------------------------------
+# makefile incantation
+
+# --- include path flag management
+ifneq ($(strip $(INC)),)
+    INCLUDE=-I$(INC)
+else
+    INCLUDE=
+endif
+
+# --- release flag management
+ifeq ($(strip $(RELEASE)), 0)
+    CFLAGS=-g3 -Os
+    LDFLAGS+=-g3 -Os
+else
+    CFLAGS=-O2
+endif
+
+# --- flags definition
+#merge all c compiler options
+CFLAGS+=$(CPUFLAGS) -std=c23 -Wall -Wextra -Warray-bounds \
+		-Wno-unused-parameter -fomit-frame-pointer $(C_DEFS)
+#merge all asm compiler options
+ASFLAG=-Wa,--gdwarf2 -D__ASSEMBLY__ $(C_DEFS) $(A_DEFS)
+#merge all linker options
+LDFLAGS+=-lc -lgcc -lgcov -lm -Wl,-Map=$@.map,--gc-sections
+
+# --- folder creation
+DIR_GUARD=@mkdir -p $(@D)
+
+#-------------------------------------------------------------------------------
+# makefile rules
+
+# --- main rule
+all: $(BIN)/$(EXE_PREFIX)
+
+# --- rules configuration
+rebuild : clean all
+
+.SUFFIXES:
+.SECONDARY:
+#define rules name
+.PHONY: all clean rebuild
+
+# --- secondary rules
+#exec file compilation
+$(BIN)/$(EXE_PREFIX) : $(MAIN_OBJ_FILES) $(OBJ_FILES)
+	@echo
+	@printf '\e[1;32m==== linking $@ ====\e[0m'
+	@echo
+	$(DIR_GUARD)
+	$(CC) $(LIBRARIES) $(LDFLAGS) $(CFLAGS) -o $@ $^
+	@$(SKIP_LINE)
+
+#c files compilation
+$(OBJ)/%.o : %.c
+	@echo
+	@printf '\e[1;34m==== compiling [opt=$(opt)] $< ====\e[0m'
+	@echo
+	$(DIR_GUARD)
+	$(CC) $(INCLUDE) -c $(CFLAGS) $< -o $@ $(LIBRARIES)
+	@$(SKIP_LINE)
+
+$(BIN)/%.o : %.c
+	@echo
+	@printf '\e[1;34m==== compiling [opt=$(opt)] $< ====\e[0m'
+	@echo
+	$(DIR_GUARD)
+	$(CC) $(INCLUDE) -c $(CFLAGS) $< -o $@ $(LIBRARIES)
+	@$(SKIP_LINE)
+
+#asm files compilation
+$(OBJ)/%.o : %.s
+	@echo
+	@printf '\e[1;35m==== compiling [opt=$(opt)] $^ $@ $(LIBRARIES)====\e[0m'
+	@echo
+	$(DIR_GUARD)
+	$(AS) $(ASFLAGS) $< -o $@ $(LIBRARIES)
+	@$(SKIP_LINE)
+
+$(BIN)/%.o : %.s
+	@echo
+	@printf '\e[1;35m==== compiling [opt=$(opt)] $^ $@ $(LIBRARIES)====\e[0m'
+	@echo
+	$(DIR_GUARD)
+	$(AS) $(ASFLAGS) $< -o $@ $(LIBRARIES)
+	@$(SKIP_LINE)
+
+# --- remove generated files
+clean:
+	-rm -rf $(BIN)/*
+
+-include $(DEPEND_FILES)
+

src/ffmpeg.c

@@ -0,0 +1,98 @@
+/** @file ffmpeg.c
+ *
+ */
+
+//--includes--------------------------------------------------------------------
+
+#include <libavdevice/avdevice.h>
+#include <time.h> //required by videodev2.h
+#include <linux/videodev2.h>
+#include <libv4l2.h>
+#include <sys/ioctl.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+
+//--local definitions-----------------------------------------------------------
+
+const AVDeviceInfo* find_h264_device(const AVDeviceInfoList* device_list);
+
+
+//--local variables-------------------------------------------------------------
+
+//--public functions------------------------------------------------------------
+
+int ffmpeg_init(void)
+{
+	avdevice_register_all();
+
+	const AVInputFormat* v4l2_format = av_find_input_format("v4l2");
+	AVDeviceInfoList* device_info_list;
+	int device_nb = avdevice_list_input_sources(v4l2_format, nullptr, nullptr,
+			&device_info_list);
+	if (device_nb < 0) {
+		fprintf(stderr, "Failed to list available devices\n");
+		avdevice_free_list_devices(&device_info_list);
+		return -1;
+	} else if (device_nb == 0) {
+		fprintf(stderr, "No compatible input device found\n");
+		avdevice_free_list_devices(&device_info_list);
+		return -1;
+	}
+
+	const AVDeviceInfo* device = find_h264_device(device_info_list);
+	if (device == nullptr) {
+		fprintf(stderr, "No H264 device found\n");
+		avdevice_free_list_devices(&device_info_list);
+		return -1;
+	}
+
+	printf("Found compatible device: %s\n%s\n",
+			device->device_name,
+			device->device_description);
+
+	avdevice_free_list_devices(&device_info_list);
+	return 0;
+}
+
+void ffmpeg_deinit()
+{
+}
+
+//--local functions-------------------------------------------------------------
+
+const AVDeviceInfo* find_h264_device(const AVDeviceInfoList* device_list)
+{
+	for (int i=0; i<device_list->nb_devices; ++i) {
+		const AVDeviceInfo* device = device_list->devices[i];
+
+		int fd;
+		if ((fd = v4l2_open(device->device_name, O_RDWR)) < 0) {
+			fprintf(stderr, "Failed to open: %s, ignoring...\n",
+					device->device_name);
+			continue;
+		}
+
+		bool found = false;
+		struct v4l2_fmtdesc fmt;
+		fmt.index = 0;
+		fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+		while (v4l2_ioctl(fd, VIDIOC_ENUM_FMT, &fmt) >= 0) {
+			if (fmt.pixelformat == V4L2_PIX_FMT_H264) {
+				found = true;
+				break;
+			}
+
+			++fmt.index;
+		}
+
+		v4l2_close(fd);
+		if (found == true) {
+			return device;
+		}
+	}
+
+	return nullptr;
+}
+

src/ffmpeg.h

@@ -0,0 +1,22 @@
+/** @file ffmpeg.h
+ *
+ */
+
+//--includes--------------------------------------------------------------------
+
+#include <stdint.h>
+
+
+//--local definitions-----------------------------------------------------------
+
+//--local variables-------------------------------------------------------------
+
+//--public functions------------------------------------------------------------
+
+int ffmpeg_init();
+int ffmpeg_deinit();
+int ffmpeg_read_frame(uint8_t* some_data);
+
+
+//--local functions-------------------------------------------------------------
+

src/main.c

@@ -0,0 +1,10 @@
+
+#include "ffmpeg.h"
+
+int main(void)
+{
+	ffmpeg_init();
+	ffmpeg_deinit();
+
+	return 0;
+}