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# FindGStreamer
# ---------
#
# Locate the gstreamer-1.0 library and some of its plugins.
# Defines the following imported target:
#
# ``GStreamer::GStreamer``
# If the gstreamer-1.0 library is available and target GStreamer::Base,
# GStreamer::Audio, GStreamer::Video, GStreamer::Pbutils and
# GStreamer::Allocators exist
#
# If target GStreamer::GStreamer exists, the following targets may be defined:
#
# ``GStreamer::App``
# If the gstapp-1.0 library is available and target GStreamer::GStreamer exists
# ``GStreamer::Photography``
# If the gstphotography-1.0 library is available and target GStreamer::GStreamer exists
# ``GStreamer::Gl``
# If the gstgl-1.0 library is available and target GStreamer::GStreamer exists
#
include(CMakeFindDependencyMacro)
find_dependency(GObject)
find_package(PkgConfig QUIET)
function(find_gstreamer_component component prefix header library)
if(NOT TARGET GStreamer::${component})
string(TOUPPER ${component} upper)
pkg_check_modules(PC_GSTREAMER_${upper} ${prefix} IMPORTED_TARGET)
if(TARGET PkgConfig::PC_GSTREAMER_${upper})
add_library(GStreamer::${component} INTERFACE IMPORTED)
target_link_libraries(GStreamer::${component} INTERFACE PkgConfig::PC_GSTREAMER_${upper})
else()
find_path(GStreamer_${component}_INCLUDE_DIR
NAMES ${header}
PATH_SUFFIXES gstreamer-1.0
)
find_library(GStreamer_${component}_LIBRARY
NAMES ${library}
)
if(${component} STREQUAL "Gl")
# search the gstglconfig.h include dir under the same root where the library is found
get_filename_component(gstglLibDir "${GStreamer_Gl_LIBRARY}" PATH)
find_path(GStreamer_GlConfig_INCLUDE_DIR
NAMES gst/gl/gstglconfig.h
PATH_SUFFIXES gstreamer-1.0/include
HINTS ${PC_GSTREAMER_GL_INCLUDE_DIRS} ${PC_GSTREAMER_GL_INCLUDEDIR} "${gstglLibDir}"
)
if(GStreamer_GlConfig_INCLUDE_DIR)
list(APPEND GStreamer_Gl_INCLUDE_DIR "${GStreamer_GlConfig_INCLUDE_DIR}")
list(REMOVE_DUPLICATES GStreamer_Gl_INCLUDE_DIR)
endif()
endif()
if(GStreamer_${component}_LIBRARY AND GStreamer_${component}_INCLUDE_DIR)
add_library(GStreamer::${component} INTERFACE IMPORTED)
target_include_directories(GStreamer::${component} INTERFACE GStreamer_${component}_INCLUDE_DIR)
target_link_libraries(GStreamer::${component} INTERFACE GStreamer_${component}_LIBRARY)
endif()
mark_as_advanced(GStreamer_${component}_INCLUDE_DIR GStreamer_${component}_LIBRARY)
endif()
endif()
if(TARGET GStreamer::${component})
set(GStreamer_${component}_FOUND TRUE PARENT_SCOPE)
endif()
endfunction()
# GStreamer required dependencies
find_gstreamer_component(Core gstreamer-1.0 gst/gst.h gstreamer-1.0)
find_gstreamer_component(Base gstreamer-base-1.0 gst/gst.h gstbase-1.0)
find_gstreamer_component(Audio gstreamer-audio-1.0 gst/audio/audio.h gstaudio-1.0)
find_gstreamer_component(Video gstreamer-video-1.0 gst/video/video.h gstvideo-1.0)
find_gstreamer_component(Pbutils gstreamer-pbutils-1.0 gst/pbutils/pbutils.h gstpbutils-1.0)
find_gstreamer_component(Allocators gstreamer-allocators-1.0 gst/allocators/allocators.h gstallocators-1.0)
if(TARGET GStreamer::Core)
target_link_libraries(GStreamer::Core INTERFACE GObject::GObject)
endif()
if(TARGET GStreamer::Base AND TARGET GStreamer::Core)
target_link_libraries(GStreamer::Base INTERFACE GStreamer::Core)
endif()
if(TARGET GStreamer::Audio AND TARGET GStreamer::Base)
target_link_libraries(GStreamer::Audio INTERFACE GStreamer::Base)
endif()
if(TARGET GStreamer::Video AND TARGET GStreamer::Base)
target_link_libraries(GStreamer::Video INTERFACE GStreamer::Base)
endif()
if(TARGET GStreamer::Pbutils AND TARGET GStreamer::Audio AND TARGET GStreamer::Video)
target_link_libraries(GStreamer::Pbutils INTERFACE GStreamer::Audio GStreamer::Video)
endif()
if(TARGET GStreamer::Allocators AND TARGET GStreamer::Core)
target_link_libraries(GStreamer::Allocators INTERFACE GStreamer::Core)
endif()
# GStreamer optional components
foreach(component ${GStreamer_FIND_COMPONENTS})
if (${component} STREQUAL "App")
find_gstreamer_component(App gstreamer-app-1.0 gst/app/gstappsink.h gstapp-1.0)
if(TARGET GStreamer::App AND TARGET GStreamer::Base)
target_link_libraries(GStreamer::App INTERFACE GStreamer::Base)
endif()
elseif (${component} STREQUAL "Photography")
find_gstreamer_component(Photography gstreamer-photography-1.0 gst/interfaces/photography.h gstphotography-1.0)
if(TARGET GStreamer::Photography AND TARGET GStreamer::Core)
target_link_libraries(GStreamer::Photography INTERFACE GStreamer::Core)
endif()
elseif (${component} STREQUAL "Gl")
find_gstreamer_component(Gl gstreamer-gl-1.0 gst/gl/gl.h gstgl-1.0)
if(TARGET GStreamer::Gl AND TARGET GStreamer::Video AND TARGET GStreamer::Allocators)
target_link_libraries(GStreamer::Gl INTERFACE GStreamer::Video GStreamer::Allocators)
endif()
else()
message(WARNING "FindGStreamer.cmake: Invalid Gstreamer component \"${component}\" requested")
endif()
endforeach()
# Create target GStreamer::GStreamer
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(GStreamer
REQUIRED_VARS
GStreamer_Core_FOUND
GStreamer_Base_FOUND
GStreamer_Audio_FOUND
GStreamer_Video_FOUND
GStreamer_Pbutils_FOUND
GStreamer_Allocators_FOUND
HANDLE_COMPONENTS
)
if(GStreamer_FOUND AND NOT TARGET GStreamer::GStreamer)
add_library(GStreamer::GStreamer INTERFACE IMPORTED)
target_link_libraries(GStreamer::GStreamer INTERFACE
GStreamer::Core
GStreamer::Base
GStreamer::Audio
GStreamer::Video
GStreamer::Pbutils
GStreamer::Allocators
)
endif()
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