Create the file where the ffmpeg camera driver will be implemented

Makefile.common

@@ -2238,9 +2238,10 @@ ifeq ($(HAVE_FFMPEG), 1)
           cores/libretro-ffmpeg/ffmpeg_core.o \
           cores/libretro-ffmpeg/packet_buffer.o \
           cores/libretro-ffmpeg/video_buffer.o \
-          $(LIBRETRO_COMM_DIR)/rthreads/tpool.o
+          $(LIBRETRO_COMM_DIR)/rthreads/tpool.o \
+          camera/drivers/ffmpeg.o
 
-   LIBS += $(AVCODEC_LIBS) $(AVFORMAT_LIBS) $(AVUTIL_LIBS) $(SWSCALE_LIBS) $(SWRESAMPLE_LIBS) $(FFMPEG_LIBS)
+   LIBS += $(AVCODEC_LIBS) $(AVFORMAT_LIBS) $(AVUTIL_LIBS) $(SWSCALE_LIBS) $(SWRESAMPLE_LIBS) $(FFMPEG_LIBS) $(AVDEVICE_LIBS)
    DEFINES += -DHAVE_FFMPEG
    DEF_FLAGS += $(AVCODEC_CFLAGS) $(AVFORMAT_CFLAGS) $(AVUTIL_CFLAGS) $(SWSCALE_CFLAGS) $(SWRESAMPLE_CFLAGS) \
                 -Wno-deprecated-declarations

Makefile.win

@@ -89,6 +89,7 @@ AVUTIL_LIBS      := -lavutil
 SWSCALE_LIBS     := -lswscale
 AVFORMAT_LIBS    := -lavformat
 SWRESAMPLE_LIBS  := -lswresample
+AVDEVICE_LIBS    := -lavdevice
 FFMPEG_LIBS      := -lws2_32 -lz
 endif
 

camera/drivers/ffmpeg.c

@@ -0,0 +1,20 @@
+/*  RetroArch - A frontend for libretro.
+*  Copyright (C) 2010-2023 - Hans-Kristian Arntzen
+*  Copyright (C) 2023 - Jesse Talavera-Greenberg
+*
+*  RetroArch is free software: you can redistribute it and/or modify it under the terms
+*  of the GNU General Public License as published by the Free Software Found-
+*  ation, either version 3 of the License, or (at your option) any later version.
+*
+*  RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+*  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+*  PURPOSE.  See the GNU General Public License for more details.
+*
+*  You should have received a copy of the GNU General Public License along with RetroArch.
+*  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <libretro.h>
+
+#include "../camera_driver.h"
+#include "../../retroarch.h"