[cmake] ffmpeg: use CPM and source archive (#155)

Cherry-picked from refactor/cpm. Dramatically reduces download time

Signed-off-by: crueter <crueter@eden-emu.dev>

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/155

.gitmodules

@@ -19,9 +19,6 @@
 [submodule "cpp-httplib"]
 	path = externals/cpp-httplib
 	url = https://github.com/yhirose/cpp-httplib.git
-[submodule "ffmpeg"]
-	path = externals/ffmpeg/ffmpeg
-	url = https://github.com/FFmpeg/FFmpeg.git
 [submodule "vcpkg"]
 	path = externals/vcpkg
 	url = https://github.com/microsoft/vcpkg.git

CMakeLists.txt

@@ -491,6 +491,8 @@ set(FFmpeg_COMPONENTS
     avutil
     swscale)
 
+set(CPM_SOURCE_CACHE ${CMAKE_SOURCE_DIR}/.cache/cpm)
+
 add_subdirectory(externals)
 
 if (ENABLE_QT)

externals/CMakeLists.txt

@@ -83,8 +83,6 @@ if (YUZU_USE_EXTERNAL_SDL2)
         set(SDL_FILE ON)
     endif()
 
-    set(CPM_SOURCE_CACHE ${CMAKE_SOURCE_DIR}/.cache/cpm)
-
     include(CPM)
     set(CPM_USE_LOCAL_PACKAGES OFF)
 

externals/ffmpeg/CMakeLists.txt

@@ -19,8 +19,17 @@ if (NOT WIN32 AND NOT ANDROID)
         message(FATAL_ERROR "Required program `autoconf` not found.")
     endif()
 
-    set(FFmpeg_PREFIX ${PROJECT_SOURCE_DIR}/externals/ffmpeg/ffmpeg)
-    set(FFmpeg_BUILD_DIR ${PROJECT_BINARY_DIR}/externals/ffmpeg-build)
+    include(CPM)
+    set(CPM_USE_LOCAL_PACKAGES OFF)
+
+    CPMAddPackage(
+        NAME ffmpeg
+        URL "https://github.com/ffmpeg/ffmpeg/archive/9c1294eadd.zip"
+        URL_HASH SHA512=2076e4cb843787c44718c70c4452517273dbc963ef98442f343762ade6c7b9f78555ae9b50a7c628844a15d8cb5e866c04e2f1acfb77093cea4fbc9edf3ad21a
+    )
+
+    set(FFmpeg_PREFIX ${ffmpeg_SOURCE_DIR})
+    set(FFmpeg_BUILD_DIR ${ffmpeg_BINARY_DIR})
     set(FFmpeg_MAKEFILE ${FFmpeg_BUILD_DIR}/Makefile)
     make_directory(${FFmpeg_BUILD_DIR})
 

src/yuzu/externals/CMakeLists.txt

@@ -6,7 +6,6 @@ set(BUILD_SHARED_LIBS OFF)
 
 # QuaZip
 include(CPM)
-set(CPM_SOURCE_CACHE ${CMAKE_SOURCE_DIR}/.cache/cpm)
 set(CPM_USE_LOCAL_PACKAGES ON)
 
 CPMAddPackage(