From a7b3d1e5d6e40ba90000a8d40a74218eca07c59c Mon Sep 17 00:00:00 2001
From: Klemens Nanni <kn@openbsd.org>
Date: Fri, 2 Aug 2024 04:01:30 +0300
Subject: [PATCH] CMake: Unbundle libSRTP

---
 CMakeLists.txt       | 10 +++++++---
 cmake/external.cmake | 15 +++++++++++++++
 2 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index b6ab87853..03c7d25f0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -75,7 +75,6 @@ include(cmake/generate_field_trials.cmake)
 include(cmake/external.cmake)
 include(cmake/libpffft.cmake)
 include(cmake/librnnoise.cmake)
-include(cmake/libsrtp.cmake)
 include(cmake/libyuv.cmake)
 if (APPLE)
     include(cmake/libsdkmacos.cmake)
@@ -132,7 +131,6 @@ target_link_libraries(tg_owt
 PRIVATE
     tg_owt::libpffft
     tg_owt::librnnoise
-    tg_owt::libsrtp
     tg_owt::libyuv
 )
 
@@ -153,6 +151,7 @@ link_ffmpeg(tg_owt)
 link_opus(tg_owt)
 link_libabsl(tg_owt)
 link_libopenh264(tg_owt)
+link_libsrtp(tg_owt)
 link_libvpx(tg_owt)
 link_crc32c(tg_owt)
 link_dl(tg_owt)
@@ -2622,13 +2621,18 @@ list(APPEND export_targets
     libwebrtcbuild
     libpffft
     librnnoise
-    libsrtp
     libyuv
 )
 if (NOT absl_FOUND)
     include(cmake/libabsl.cmake)
     list(APPEND export_targets libabsl)
 endif()
+if (NOT SRTP_FOUND)
+    include(cmake/libsrtp.cmake)
+    list(APPEND export_targets libsrtp)
+else()
+    target_compile_definitions(tg_owt PRIVATE WEBRTC_EXTERNAL_SRTP)
+endif()
 if (NOT Crc32c_FOUND)
     include(cmake/libcrc32c.cmake)
     list(APPEND export_targets libcrc32c)
diff --git a/cmake/external.cmake b/cmake/external.cmake
index 1c71f8518..d94354718 100644
--- a/cmake/external.cmake
+++ b/cmake/external.cmake
@@ -150,6 +150,21 @@ function(link_libopenh264 target_name)
     endif()
 endfunction()
 
+# libSRTP
+function(link_libsrtp target_name)
+    if (TG_OWT_PACKAGED_BUILD)
+        find_package(PkgConfig REQUIRED)
+        pkg_check_modules(SRTP libsrtp2)
+        if (SRTP_FOUND)
+            target_include_directories(${target_name} SYSTEM PRIVATE ${SRTP_INCLUDE_DIRS})
+            target_link_libraries(${target_name} PRIVATE ${SRTP_LINK_LIBRARIES})
+        endif()
+    endif()
+    if (NOT SRTP_FOUND)
+        target_link_libraries(${target_name} PRIVATE tg_owt::libsrtp)
+    endif()
+endfunction()
+
 # libvpx
 set(TG_OWT_LIBVPX_INCLUDE_PATH "" CACHE STRING "Include path for libvpx.")
 function(link_libvpx target_name)