From ad60ae1d404d6f4417195d37ab66caa40a757af6 Mon Sep 17 00:00:00 2001
From: Alexandre Bouvier <contact@amb.tf>
Date: Fri, 16 Aug 2024 15:56:47 +0000
Subject: [PATCH] cmake: prefer system ffmpeg library (#451)

---
 CMakeLists.txt           |  3 ++-
 cmake/FindFFmpeg.cmake   | 23 +++++++++++++++++++++++
 externals/CMakeLists.txt |  3 ++-
 3 files changed, 27 insertions(+), 2 deletions(-)
 create mode 100644 cmake/FindFFmpeg.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt
index ff03befc..009006a4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -67,6 +67,7 @@ configure_file("${CMAKE_CURRENT_SOURCE_DIR}/src/common/scm_rev.cpp.in" "${CMAKE_
 
 find_package(Boost 1.84.0 CONFIG)
 find_package(cryptopp 8.9.0 MODULE)
+find_package(FFmpeg 5.1.2 MODULE)
 find_package(fmt 10.2.1 CONFIG)
 find_package(glslang 14.2.0 CONFIG)
 find_package(magic_enum 0.9.6 CONFIG)
@@ -607,7 +608,7 @@ endif()
 
 create_target_directory_groups(shadps4)
 
-target_link_libraries(shadps4 PRIVATE magic_enum::magic_enum fmt::fmt toml11::toml11 tsl::robin_map xbyak::xbyak Tracy::TracyClient RenderDoc::API ffmpeg)
+target_link_libraries(shadps4 PRIVATE magic_enum::magic_enum fmt::fmt toml11::toml11 tsl::robin_map xbyak::xbyak Tracy::TracyClient RenderDoc::API FFmpeg::ffmpeg)
 target_link_libraries(shadps4 PRIVATE Boost::headers GPUOpen::VulkanMemoryAllocator sirit Vulkan::Headers xxHash::xxhash Zydis::Zydis glslang::SPIRV glslang::glslang SDL3::SDL3)
 
 if (APPLE)
diff --git a/cmake/FindFFmpeg.cmake b/cmake/FindFFmpeg.cmake
new file mode 100644
index 00000000..9c45844b
--- /dev/null
+++ b/cmake/FindFFmpeg.cmake
@@ -0,0 +1,23 @@
+# SPDX-FileCopyrightText: Copyright 2024 shadPS4 Emulator Project
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+find_package(PkgConfig QUIET)
+pkg_check_modules(FFMPEG QUIET IMPORTED_TARGET libavcodec libavfilter libavformat libavutil libswresample libswscale)
+
+find_file(FFMPEG_VERSION_FILE libavutil/ffversion.h HINTS "${FFMPEG_libavutil_INCLUDEDIR}")
+if (FFMPEG_VERSION_FILE)
+    file(STRINGS "${FFMPEG_VERSION_FILE}" FFMPEG_VERSION_LINE REGEX "FFMPEG_VERSION")
+    string(REGEX MATCH "[0-9.]+" FFMPEG_VERSION "${FFMPEG_VERSION_LINE}")
+    unset(FFMPEG_VERSION_LINE)
+    unset(FFMPEG_VERSION_FILE)
+endif()
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(FFmpeg
+    REQUIRED_VARS FFMPEG_LINK_LIBRARIES
+    VERSION_VAR FFMPEG_VERSION
+)
+
+if (FFmpeg_FOUND AND NOT TARGET FFmpeg::ffmpeg)
+    add_library(FFmpeg::ffmpeg ALIAS PkgConfig::FFMPEG)
+endif()
diff --git a/externals/CMakeLists.txt b/externals/CMakeLists.txt
index bc313232..0b19034d 100644
--- a/externals/CMakeLists.txt
+++ b/externals/CMakeLists.txt
@@ -47,9 +47,10 @@ else()
     endif()
 endif()
 
-if (NOT TARGET ffmpeg)
+if (NOT TARGET FFmpeg::ffmpeg)
     set(ARCHITECTURE "x86_64")
     add_subdirectory(ffmpeg-core)
+    add_library(FFmpeg::ffmpeg ALIAS ffmpeg)
 endif()
 
 # Zlib-Ng