.gitea/workflows/build.yml

@@ -16,8 +16,13 @@ on:
 
 jobs:
   linux:
-    name: Linux (ubuntu-latest)
+    name: Linux (ubuntu-24.04)
-    runs-on: ubuntu-latest
+    # Pinned to 24.04 rather than ubuntu-latest, which this instance's two
+    # Linux runners answer with different releases. 24.04's libobs-dev is
+    # 30.0.2, exactly the OBS version buildspec.json pins for macOS/Windows,
+    # so all three platforms build against the same libobs. On a 22.04 runner
+    # libobs-dev is OBS 27, which is a different API surface entirely.
+    runs-on: ubuntu-24.04
     steps:
       - name: Checkout
         uses: actions/checkout@v4

cmake/LiveKitSDK.cmake

@@ -70,7 +70,19 @@ endfunction()
 
 function(_lk_default_triple out_triple)
   _lk_detect_host(_os _arch)
+  if(_os STREQUAL "linux")
+    # NOT the generic "linux-<arch>" asset, despite the name. That one is
+    # built on Ubuntu 24.04 and needs GLIBC_2.38 and GLIBCXX_3.4.32: linking
+    # it on Ubuntu 22.04 fails outright ("undefined reference to
+    # std::ios_base_library_init()@GLIBCXX_3.4.32", "__isoc23_strtol@GLIBC_2.38"),
+    # which is exactly what happened when CI landed on a 22.04 runner.
+    # The ubuntu-22.04 asset needs at most GLIBC_2.35 / GLIBCXX_3.4.30, so it
+    # links and runs on 22.04 AND on everything newer -- the right floor for a
+    # plugin that gets handed to directors as a binary.
+    set(${out_triple} "ubuntu-22.04-${_arch}" PARENT_SCOPE)
+  else()
     set(${out_triple} "${_os}-${_arch}" PARENT_SCOPE)
+  endif()
 endfunction()
 
 function(_lk_archive_ext out_ext)

cmake/common/buildspec_common.cmake

@@ -15,6 +15,11 @@
 #   3. Only the Release configuration is built and installed. Upstream builds
 #      Debug as well; nothing here consumes a debug libobs, and it doubles the
 #      slowest step in CI.
+#   4. macOS uses the Ninja generator and a single architecture, not upstream's
+#      Xcode generator and forced universal build. See the comment at that
+#      branch: a runner with only the Command Line Tools has no xcodebuild.
+#   5. Generator flags are built as CMake lists so each becomes its own argv
+#      entry, rather than upstream's space-separated strings passed unquoted.
 #
 
 include_guard(GLOBAL)
@@ -69,24 +74,50 @@ function(_setup_obs_studio)
     set(_is_fresh --fresh)
   endif()
 
+  # Every generator-specific flag is built as a proper CMake list, so each
+  # element becomes its own argv entry. Upstream packs several flags into one
+  # space-separated string and passes it unquoted, which execute_process hands
+  # to cmake as a single argument -- it happens not to matter there because
+  # those flags are optional, but -DCMAKE_BUILD_TYPE is not.
+  set(_cmake_arch "")
+  set(_cmake_extra "")
+
   if(OS_WINDOWS)
     set(_cmake_generator "${CMAKE_GENERATOR}")
-    set(_cmake_arch "-A ${arch},version=${CMAKE_VS_WINDOWS_TARGET_PLATFORM_VERSION}")
+    if(CMAKE_VS_WINDOWS_TARGET_PLATFORM_VERSION)
-    set(_cmake_extra "-DCMAKE_SYSTEM_VERSION=${CMAKE_SYSTEM_VERSION}")
+      list(APPEND _cmake_arch -A "${arch},version=${CMAKE_VS_WINDOWS_TARGET_PLATFORM_VERSION}")
+    else()
+      list(APPEND _cmake_arch -A "${arch}")
+    endif()
+    list(APPEND _cmake_extra "-DCMAKE_SYSTEM_VERSION=${CMAKE_SYSTEM_VERSION}")
   elseif(OS_MACOS)
-    set(_cmake_generator "Xcode")
+    # Ninja, not upstream's Xcode generator. A runner with only the Command
-    set(_cmake_arch "-DCMAKE_OSX_ARCHITECTURES:STRING='arm64;x86_64'")
+    # Line Tools installed has no xcodebuild, and the Xcode generator then
-    set(_cmake_extra "-DCMAKE_OSX_DEPLOYMENT_TARGET=${CMAKE_OSX_DEPLOYMENT_TARGET}")
+    # fails the OBS sub-configure outright with "No CMAKE_C_COMPILER could be
+    # found" -- observed on the `home-mac` CI runner. Ninja is single-config,
+    # hence the explicit CMAKE_BUILD_TYPE below.
+    set(_cmake_generator "Ninja")
+    # Single-architecture, not upstream's forced universal build: this plugin
+    # is built for one architecture anyway (client-sdk-cpp ships single-arch
+    # dylibs), so building libobs universal would double the slowest step in
+    # CI for a slice nothing links against.
+    if(CMAKE_OSX_ARCHITECTURES)
+      list(APPEND _cmake_arch "-DCMAKE_OSX_ARCHITECTURES:STRING=${CMAKE_OSX_ARCHITECTURES}")
+    endif()
+    list(APPEND _cmake_extra "-DCMAKE_BUILD_TYPE=Release")
+    if(CMAKE_OSX_DEPLOYMENT_TARGET)
+      list(APPEND _cmake_extra "-DCMAKE_OSX_DEPLOYMENT_TARGET=${CMAKE_OSX_DEPLOYMENT_TARGET}")
+    endif()
   endif()
 
   message(STATUS "Configure ${label} (${arch})")
   execute_process(
     COMMAND
       "${CMAKE_COMMAND}" -S "${dependencies_dir}/${_obs_destination}" -B
-      "${dependencies_dir}/${_obs_destination}/build_${arch}" -G ${_cmake_generator} "${_cmake_arch}"
+      "${dependencies_dir}/${_obs_destination}/build_${arch}" -G ${_cmake_generator} ${_cmake_arch}
       -DOBS_CMAKE_VERSION:STRING=3.0.0 -DENABLE_PLUGINS:BOOL=OFF -DENABLE_FRONTEND:BOOL=OFF
       -DENABLE_UI:BOOL=OFF -DENABLE_SCRIPTING:BOOL=OFF -DENABLE_BROWSER:BOOL=OFF
-      -DOBS_VERSION_OVERRIDE:STRING=${_obs_version} "-DCMAKE_PREFIX_PATH='${CMAKE_PREFIX_PATH}'" ${_is_fresh}
+      -DOBS_VERSION_OVERRIDE:STRING=${_obs_version} "-DCMAKE_PREFIX_PATH=${CMAKE_PREFIX_PATH}" ${_is_fresh}
       ${_cmake_extra}
     RESULT_VARIABLE _process_result
     COMMAND_ERROR_IS_FATAL ANY

obs-adapter/src/plugin-main.cpp

@@ -165,8 +165,15 @@ void outputVideoFrame(CameraSource *self, const VideoFrameData &frame)
     }
 
     // WebRTC delivers limited-range BT.709 for anything at or above SD.
-    video_format_get_parameters_for_format(VIDEO_CS_709, VIDEO_RANGE_PARTIAL, out.format, out.color_matrix,
+    //
-                                           out.color_range_min, out.color_range_max);
+    // The plain video_format_get_parameters, not the _for_format variant:
+    // the latter only exists from libobs 30 onwards, and it only differs for
+    // the 10-bit formats (I010/P010) this source never receives. Using the
+    // older entry point keeps the module loadable on an older OBS, which is
+    // the direction that matters -- OBS refuses modules built against a
+    // NEWER libobs than the one running.
+    video_format_get_parameters(VIDEO_CS_709, VIDEO_RANGE_PARTIAL, out.color_matrix, out.color_range_min,
+                                out.color_range_max);
     out.full_range = false;
 
     obs_source_output_video(self->source, &out);