gstreamer/gst-libs/gst/opencv/meson.build

opencv_sources = [
  'gstopencvutils.cpp',
  'gstopencvvideofilter.cpp',
]

opencv_headers = [
  'opencv-prelude.h',
  'gstopencvutils.h',
  'gstopencvvideofilter.h',
]

opencv_dep = dependency('opencv', version : '>= 3.0.0', required : false)
if not opencv_dep.found()
  opencv_dep = dependency('opencv4', version : '>= 4.0.0', required : false)
endif
if opencv_dep.found()
  gstopencv = library('gstopencv-' + api_version,
    opencv_sources,
    c_args : gst_plugins_bad_args + ['-DBUILDING_GST_OPENCV'],
    cpp_args : gst_plugins_bad_args + ['-DBUILDING_GST_OPENCV'],
    include_directories : [configinc, libsinc],
    version : libversion,
    soversion : soversion,
  darwin_versions : osxversion,
    install : true,
    dependencies : [gstbase_dep, gstvideo_dep, opencv_dep],
  )

  gstopencv_dep = declare_dependency(link_with: gstopencv,
    include_directories : [libsinc],
    dependencies : [gstvideo_dep, opencv_dep])

  install_headers(opencv_headers, subdir : 'gstreamer-1.0/gst/opencv')
elif get_option('opencv').enabled()
  error('OpenCV support enabled but required dependencies were not found.')
endif
opencv: Enable in meson build https://bugzilla.gnome.org/show_bug.cgi?id=774223 2016-11-15 16:57:20 +00:00			`opencv_sources = [`
			`'gstopencvutils.cpp',`
			`'gstopencvvideofilter.cpp',`
			`]`

			`opencv_headers = [`
opencv: GST_EXPORT -> GST_OPENCV_API We need different export decorators for the different libs. For now no actual change though, just rename before the release, and add prelude headers to define the new decorator to GST_EXPORT. 2018-03-13 12:57:56 +00:00			`'opencv-prelude.h',`
opencv: Enable in meson build https://bugzilla.gnome.org/show_bug.cgi?id=774223 2016-11-15 16:57:20 +00:00			`'gstopencvutils.h',`
			`'gstopencvvideofilter.h',`
			`]`

meson: fix build with opencv=enabled and opencv4. Fixes #964 Having the opencv feature enabled would lead to the opencv3 dependency being required which failed with only opencv4 being available. Instead don't require anything and error out at the end if the feature was enabled but no dependency was found. 2019-05-05 20:11:16 +00:00			`opencv_dep = dependency('opencv', version : '>= 3.0.0', required : false)`
opencv: make compatible with opencv 4 Closed #826 2018-11-25 15:13:28 +00:00			`if not opencv_dep.found()`
meson: fix build with opencv=enabled and opencv4. Fixes #964 Having the opencv feature enabled would lead to the opencv3 dependency being required which failed with only opencv4 being available. Instead don't require anything and error out at the end if the feature was enabled but no dependency was found. 2019-05-05 20:11:16 +00:00			`opencv_dep = dependency('opencv4', version : '>= 4.0.0', required : false)`
opencv: make compatible with opencv 4 Closed #826 2018-11-25 15:13:28 +00:00			`endif`
opencv: Enable in meson build https://bugzilla.gnome.org/show_bug.cgi?id=774223 2016-11-15 16:57:20 +00:00			`if opencv_dep.found()`
			`gstopencv = library('gstopencv-' + api_version,`
			`opencv_sources,`
libs: fix API export/import and 'inconsistent linkage' on MSVC For each lib we build export its own API in headers when we're building it, otherwise import the API from the headers. This fixes linker warnings on Windows when building with MSVC. The problem was that we had defined all GST__API decorators unconditionally to GST_EXPORT. This was intentional and only supposed to be temporary, but caused linker warnings because we tell the linker that we want to export all symbols even those from externall DLLs, and when the linker notices that they were in external DLLS and not present locally it warns. What we need to do when building each library is: export the library's own symbols and import all other symbols. To this end we define e.g. BUILDING_GST_FOO and then we define the GST_FOO_API decorator either to export or to import symbols depending on whether BUILDING_GST_FOO is set or not. That way external users of each library API automatically get the import. While we're at it, add new GST_API_EXPORT in config.h and use that for GST__API decorators instead of GST_EXPORT. The right export define depends on the toolchain and whether we're using -fvisibility=hidden or not, so it's better to set it to the right thing directly than hard-coding a compiler whitelist in the public header. We put the export define into config.h instead of passing it via the command line to the compiler because it might contain spaces and brackets and in the autotools scenario we'd have to pass that through multiple layers of plumbing and Makefile/shell escaping and we're just not going to be that lucky. The export define is only used if we're compiling our lib, not by external users of the lib headers, so it's not a problem to put it into config.h Also, this means all .c files of libs need to include config.h to get the export marker defined, so fix up a few that didn't include config.h. This commit depends on a common submodule commit that makes gst-glib-gen.mak add an #include "config.h" to generated enum/marshal .c files for the autotools build. https://bugzilla.gnome.org/show_bug.cgi?id=797185 2018-09-24 10:52:22 +00:00			`c_args : gst_plugins_bad_args + ['-DBUILDING_GST_OPENCV'],`
meson: Fix plugin symbol export for C++ sources/plugins The symbol visibility=hidden flag was only being applied to C compilation, so plugins implemented in C++ would leak extra symbols than the 2 _get_desc() and _register(). That also showed that the gst-libs opencv C++ lib was not marking symbols for export correctly because the BUILDING_GST_OPENCV define wasn't in the C++ args, so fix that too. 2019-09-06 09:13:46 +00:00			`cpp_args : gst_plugins_bad_args + ['-DBUILDING_GST_OPENCV'],`
opencv: Enable in meson build https://bugzilla.gnome.org/show_bug.cgi?id=774223 2016-11-15 16:57:20 +00:00			`include_directories : [configinc, libsinc],`
			`version : libversion,`
			`soversion : soversion,`
meson: Maintain macOS ABI through dylib versioning Requires Meson 0.48, but the feature will be ignored on older versions so it's safe to add it without bumping the requirement. Documentation: https://github.com/mesonbuild/meson/blob/master/docs/markdown/Reference-manual.md#shared_library 2018-08-31 09:07:46 +00:00			`darwin_versions : osxversion,`
opencv: Enable in meson build https://bugzilla.gnome.org/show_bug.cgi?id=774223 2016-11-15 16:57:20 +00:00			`install : true,`
			`dependencies : [gstbase_dep, gstvideo_dep, opencv_dep],`
			`)`

			`gstopencv_dep = declare_dependency(link_with: gstopencv,`
			`include_directories : [libsinc],`
			`dependencies : [gstvideo_dep, opencv_dep])`
Add feature options for almost all plugins The only plugins remaining are those that haven't been ported to Meson yet, and msdk. Also, the tests are still automagic. https://bugzilla.gnome.org/show_bug.cgi?id=795107 2018-07-27 13:29:23 +00:00
			`install_headers(opencv_headers, subdir : 'gstreamer-1.0/gst/opencv')`
meson: fix build with opencv=enabled and opencv4. Fixes #964 Having the opencv feature enabled would lead to the opencv3 dependency being required which failed with only opencv4 being available. Instead don't require anything and error out at the end if the feature was enabled but no dependency was found. 2019-05-05 20:11:16 +00:00			`elif get_option('opencv').enabled()`
			`error('OpenCV support enabled but required dependencies were not found.')`
opencv: Enable in meson build https://bugzilla.gnome.org/show_bug.cgi?id=774223 2016-11-15 16:57:20 +00:00			`endif`