From 4eb8132b11aaf62d60b64b5c8af9d324a457e26a Mon Sep 17 00:00:00 2001
From: Khanh H <dextinfire@live.com>
Date: Sat, 14 Dec 2024 00:24:33 -0800
Subject: [PATCH] Make avdevice an optional component

---
 CMakeLists.txt         |  2 +-
 cmake/FindFFmpeg.cmake | 17 ++++++++---------
 src/CMakeLists.txt     |  1 +
 src/avutils.cpp        |  3 +++
 src/ffmpeg.h           |  8 +++++++-
 5 files changed, 20 insertions(+), 11 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 732a4b29..ccf1ecbc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -32,7 +32,7 @@ set(THREADS_PREFER_PTHREAD_FLAG ON)
 find_package(Threads)
 
 find_package(FFmpeg
-    COMPONENTS AVCODEC AVFORMAT AVUTIL AVDEVICE AVFILTER SWSCALE SWRESAMPLE REQUIRED)
+    COMPONENTS AVCODEC AVFORMAT AVUTIL AVFILTER SWSCALE SWRESAMPLE REQUIRED OPTIONAL_COMPONENTS AVDEVICE)
 
 add_subdirectory(src)
 
diff --git a/cmake/FindFFmpeg.cmake b/cmake/FindFFmpeg.cmake
index 2746b393..75b49db4 100644
--- a/cmake/FindFFmpeg.cmake
+++ b/cmake/FindFFmpeg.cmake
@@ -228,16 +228,15 @@ if (NOT TARGET FFmpeg::FFmpeg)
   add_library(FFmpeg::FFmpeg ALIAS FFmpeg)
 endif()
 
-# Now set the noncached _FOUND vars for the components.
-foreach (_component AVCODEC AVDEVICE AVFORMAT AVUTIL POSTPROCESS SWSCALE)
-  set_component_found(${_component})
-endforeach ()
-
-# Compile the list of required vars
-set(_FFmpeg_REQUIRED_VARS FFMPEG_LIBRARIES FFMPEG_INCLUDE_DIRS)
+set(_FFmpeg_REQUIRED_VARS)
 foreach (_component ${FFmpeg_FIND_COMPONENTS})
-  list(APPEND _FFmpeg_REQUIRED_VARS ${_component}_LIBRARIES ${_component}_INCLUDE_DIRS)
+  set_component_found(${_component})
+  # Compile the list of required vars
+  if (FFmpeg_FIND_REQUIRED_${_component})
+    list(APPEND _FFmpeg_REQUIRED_VARS ${_component}_LIBRARIES ${_component}_INCLUDE_DIRS)
+  endif()
 endforeach ()
 
 # Give a nice error message if some of the required vars are missing.
-find_package_handle_standard_args(FFmpeg DEFAULT_MSG ${_FFmpeg_REQUIRED_VARS})
+find_package_handle_standard_args(FFmpeg 
+  REQUIRED_VARS FFMPEG_INCLUDE_DIRS FFMPEG_LIBRARIES ${_FFmpeg_REQUIRED_VARS})
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 3c00150f..3f6bfb17 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -29,6 +29,7 @@ foreach(TARGET ${AV_TARGETS})
 
     target_compile_options(${TARGET} PRIVATE ${AVCPP_WARNING_OPTIONS})
     target_compile_definitions(${TARGET} PUBLIC __STDC_CONSTANT_MACROS)
+    target_compile_definitions(${TARGET} PUBLIC AVCPP_HAS_LIBAVDEVICE=${AVDEVICE_FOUND})
     target_link_libraries(${TARGET} PRIVATE Threads::Threads PUBLIC FFmpeg::FFmpeg)
     target_include_directories(${TARGET}
         PUBLIC
diff --git a/src/avutils.cpp b/src/avutils.cpp
index 6b7aa969..33be309d 100644
--- a/src/avutils.cpp
+++ b/src/avutils.cpp
@@ -177,7 +177,10 @@ void init()
 #if LIBAVFILTER_VERSION_MAJOR < 7 // FFmpeg 4.0
     avfilter_register_all();
 #endif
+
+#ifdef AVCPP_HAS_LIBAVDEVICE
     avdevice_register_all();
+#endif
 
 #if LIBAVCODEC_VERSION_MAJOR < 58 // FFmpeg 4.0
     av_lockmgr_register(avcpp_lockmgr_cb);
diff --git a/src/ffmpeg.h b/src/ffmpeg.h
index 397204fd..568dda4f 100644
--- a/src/ffmpeg.h
+++ b/src/ffmpeg.h
@@ -9,7 +9,7 @@ extern "C"
 #include <libavutil/mathematics.h>
 #include <libavutil/opt.h>
 #include <libavutil/pixdesc.h>
-#include <libavdevice/avdevice.h>
+#include <libavformat/avformat.h>
 #include <libswscale/swscale.h>
 #include <libswresample/swresample.h>
 #include <libavformat/version.h>
@@ -30,6 +30,12 @@ extern "C" {
 #endif
 }
 
+extern "C" {
+#ifdef AVCPP_HAS_LIBAVDEVICE
+#include <libavdevice/avdevice.h>
+#endif
+} 
+
 // Compat level
 
 // avcodec