meson: Add feature options for all plugins

GL dependency detection is still automagic.

https://bugzilla.gnome.org/show_bug.cgi?id=795107

docs/libs/meson.build

@@ -2,7 +2,7 @@
 # but then what about the other files (sections, sgml)
 types = configure_file(input : 'gst-plugins-base-libs.types',
   output : 'gst-plugins-base-libs.types',
-  configuration : configuration_data())
+  copy : true)
 
 ignored_headers = ['pbutils-private.h', 'gsttageditingprivate.h', 'id3v2.h',
   'kiss_fft_f32.h', 'kiss_fft_f64.h', 'kiss_fftr_f32.h', 'kiss_fftr_f64.h',

ext/alsa/meson.build

@@ -7,7 +7,7 @@ alsa_sources = [
   'gstalsasrc.c',
 ]
 
-alsa_dep = dependency('alsa', version : '>=0.9.1', required : false)
+alsa_dep = dependency('alsa', version : '>=0.9.1', required : get_option('alsa'))
 
 if alsa_dep.found()
   gstalsa = library('gstalsa',

ext/cdparanoia/meson.build

@@ -2,13 +2,14 @@ cdparanoia_deps = []
 cdparanoia_found = false
 
 # cdparanoia upstream has a pkg-config file only in post-10.2 SVN so far, no release yet
-cdparanoia_dep = dependency('cdparanoia-3', version : '>=10.2', required : false)
+cdparanoia_dep = dependency('cdparanoia-3', version : '>=10.2',
+                            required : get_option('cdparanoia'))
 if cdparanoia_dep.found()
   cdparanoia_deps = [cdparanoia_dep]
   cdparanoia_found = true
 else
-  cdparanoia_dep = cc.find_library('cdda_paranoia', required : false)
-  cdinterface_dep = cc.find_library('cdda_interface', required : false)
+  cdparanoia_dep = cc.find_library('cdda_paranoia', required : get_option('cdparanoia'))
+  cdinterface_dep = cc.find_library('cdda_interface', required : get_option('cdparanoia'))
   if cdparanoia_dep.found() and cdinterface_dep.found()
     cdparanoia_deps = [cdparanoia_dep, cdinterface_dep]
     cdparanoia_found = true

ext/libvisual/meson.build

@@ -3,7 +3,8 @@ libvisual_sources = [
   'plugin.c',
 ]
 
-libvisual_dep = dependency('libvisual-0.4', version : '>= 0.4.0', required : false)
+libvisual_dep = dependency('libvisual-0.4', version : '>= 0.4.0',
+                           required : get_option('libvisual'))
 if libvisual_dep.found()
   core_conf.set_quoted('LIBVISUAL_PLUGINSBASEDIR',
     libvisual_dep.get_pkgconfig_variable('pluginsbasedir'))

ext/meson.build

@@ -1,9 +1,10 @@
 subdir('alsa')
 subdir('cdparanoia')
+# FIXME: gl deps are automagic
 subdir('gl')
 if cc.get_id() != 'msvc'
-  # libvisual has MinGW-specific headers which are not compatible with MSVC
-  # If we want to build this with MSVC, we must build libvisual with it too
+  # FIXME: libvisual has MinGW-specific headers which are not compatible with
+  # MSVC. Need to either fix the headers or build libvisual with MSVC too.
   subdir('libvisual')
 endif
 subdir('ogg')

ext/ogg/meson.build

@@ -10,7 +10,7 @@ ogg_sources = [
   'vorbis_parse.c',
 ]
 
-ogg_dep = dependency('ogg', version : '>=1.0', required : false)
+ogg_dep = dependency('ogg', version : '>=1.0', required : get_option('ogg'))
 core_conf.set('HAVE_OGG', ogg_dep.found())
 
 if ogg_dep.found()

ext/opus/meson.build

@@ -6,7 +6,7 @@ opus_sources = [
   'gstopusheader.c',
 ]
 
-opus_dep = dependency('opus', version : '>= 0.9.4', required : false)
+opus_dep = dependency('opus', version : '>= 0.9.4', required : get_option('opus'))
 
 if opus_dep.found()
   gstopus = library('gstopus',

ext/pango/meson.build

@@ -6,7 +6,7 @@ pango_sources = [
   'gsttimeoverlay.c',
 ]
 
-pango_dep = dependency('pangocairo', version : '>=1.22.0', required : false)
+pango_dep = dependency('pangocairo', version : '>=1.22.0', required : get_option('pango'))
 
 if pango_dep.found()
   gstpango = library('gstpango',

ext/theora/meson.build

@@ -3,8 +3,8 @@ theora_sources = [
   'gsttheoraparse.c',
 ]
 
-theoradec_dep = dependency('theoradec', version : '>=1.1', required : false)
-theoraenc_dep = dependency('theoraenc', version : '>=1.1', required : false)
+theoradec_dep = dependency('theoradec', version : '>=1.1', required : get_option('theora'))
+theoraenc_dep = dependency('theoraenc', version : '>=1.1', required : get_option('theora'))
 core_conf.set('HAVE_THEORA', theoradec_dep.found() and theoraenc_dep.found())
 theora_deps = []
 

ext/vorbis/meson.build

@@ -15,9 +15,9 @@ vorbisidec_sources = [
   'gstvorbiscommon.c',
 ]
 
-vorbis_dep = dependency('vorbis', version : '>=1.0', required : false)
-vorbisenc_dep = dependency('vorbisenc', version : '>=1.0', required : false)
-vorbisidec_dep = dependency('vorbisidec', required : false)
+vorbis_dep = dependency('vorbis', version : '>=1.0', required : get_option('vorbis'))
+vorbisenc_dep = dependency('vorbisenc', version : '>=1.0', required : get_option('vorbis'))
+vorbisidec_dep = dependency('vorbisidec', required : get_option('vorbis'))
 
 if vorbis_dep.found() or vorbisidec_dep.found()
   if cc.has_header_symbol('vorbis/codec.h', 'vorbis_synthesis_restart')

gst-libs/gst/meson.build

@@ -9,4 +9,5 @@ subdir('pbutils')
 subdir('riff')
 subdir('app')
 subdir('allocators')
+# FIXME: gl deps are automagic
 subdir('gl')

gst-libs/gst/rtsp/meson.build

@@ -31,9 +31,13 @@ rtsp_enums = gnome.mkenums_simple('gstrtsp-enumtypes',
 gstrtsp_c = rtsp_enums[0]
 gstrtsp_h = rtsp_enums[1]
 
-winsock2 = cc.find_library('ws2_32', required : false)
-
+if host_system == 'windows'
+  winsock2 = cc.find_library('ws2_32')
+else
+  winsock2 = []
+endif
 gstrtsp_deps = [gst_base_dep, gst_dep, gio_dep, libm, winsock2]
+
 gst_rtsp = library('gstrtsp-@0@'.format(api_version),
   rtsp_sources,
   gstrtsp_h, gstrtsp_c,

gst-libs/gst/tag/meson.build

@@ -49,6 +49,7 @@ gst_tag_args = [
       'license-translations.dict'))
 ]
 
+# FIXME: optional zlib support?
 tag_deps = [gst_base_dep, libm]
 gsttag = library('gsttag-@0@'.format(api_version),
   tag_sources, gsttag_h, gsttag_c,

gst/meson.build

@@ -1,20 +1,8 @@
-subdir('adder')
-subdir('app')
-subdir('audioconvert')
-subdir('audiomixer')
-subdir('audiorate')
-subdir('audioresample')
-subdir('audiotestsrc')
-subdir('encoding')
-subdir('gio')
-subdir('pbtypes')
-subdir('playback')
-subdir('rawparse')
-subdir('subparse')
-subdir('tcp')
-subdir('typefind')
-subdir('videoconvert')
-subdir('videorate')
-subdir('videoscale')
-subdir('videotestsrc')
-subdir('volume')
+foreach plugin : ['adder', 'app', 'audioconvert', 'audiomixer', 'audiorate', 'audioresample',
+                  'audiotestsrc', 'encoding', 'gio', 'pbtypes', 'playback', 'rawparse',
+                  'subparse', 'tcp', 'typefind', 'videoconvert', 'videorate', 'videoscale',
+                  'videotestsrc', 'volume']
+  if not get_option(plugin).disabled()
+    subdir(plugin)
+  endif
+endforeach

meson.build

@@ -1,6 +1,6 @@
 project('gst-plugins-base', 'c',
   version : '1.15.0.1',
-  meson_version : '>= 0.46.0',
+  meson_version : '>= 0.47',
   default_options : [ 'warning_level=1',
                       'buildtype=debugoptimized' ])
 
@@ -31,6 +31,7 @@ libversion = '@0@.@1@.0'.format(soversion, gst_version_minor * 100 + gst_version
 plugins_install_dir = '@0@/gstreamer-1.0'.format(get_option('libdir'))
 
 cc = meson.get_compiler('c')
+host_system = host_machine.system()
 
 if cc.get_id() == 'msvc'
   # Ignore several spurious warnings for things gstreamer does very commonly
@@ -112,9 +113,6 @@ core_conf.set('SIZEOF_LONG', cc.sizeof('long'))
 core_conf.set('SIZEOF_SHORT', cc.sizeof('short'))
 core_conf.set('SIZEOF_VOIDP', cc.sizeof('void*'))
 
-if get_option('nls')
-  core_conf.set('ENABLE_NLS', 1)
-endif
 core_conf.set_quoted('GETTEXT_PACKAGE', 'gst-plugins-base-1.0')
 core_conf.set_quoted('LOCALEDIR', join_paths(get_option('prefix'), get_option('localedir')))
 core_conf.set_quoted('PACKAGE', 'gst-plugins-base')
@@ -208,24 +206,32 @@ if get_option('default_library') == 'static'
 endif
 
 # X11 checks are for sys/ and tests/
-x11_dep = dependency('x11', required : false)
+x11_dep = dependency('x11', required : get_option('x11'))
 # GLib checks are for the entire project
-giounix_dep = dependency('gio-unix-2.0', version : glib_req, required : false)
 # Almost everything that uses glib also uses gobject
 glib_deps = [dependency('glib-2.0', version : glib_req, fallback: ['glib', 'libglib_dep']),
              dependency('gobject-2.0', fallback: ['glib', 'libgobject_dep'])]
+# GIO is used by the GIO plugin, and by the TCP, SDP, and RTSP plugins
 gio_dep = dependency('gio-2.0', fallback: ['glib', 'libgio_dep'])
-
-# some of the examples want GTK+
-gtk_dep = dependency('gtk+-3.0', version : '>= 3.10', required : false)
-gtk_x11_dep = dependency('gtk+-x11-3.0', version : '>= 3.10', required : false)
-gtk_quartz_dep = dependency('gtk+-quartz-3.0', version : '>= 3.10', required : false)
-gdk_pixbuf_dep = dependency('gdk-pixbuf-2.0', required : false)
+giounix_dep = dependency('gio-unix-2.0', version : glib_req, required : host_system != 'windows',
+                         fallback: ['glib', 'libgiounix_dep'])
+
+# some of the examples can use gdk-pixbuf and GTK+3
+gdk_pixbuf_dep = dependency('gdk-pixbuf-2.0', required : get_option('examples'))
+gtk_dep = dependency('gtk+-3.0', version : '>= 3.10', required : get_option('examples'))
+# TODO: https://github.com/mesonbuild/meson/issues/3941
+if not get_option('x11').disabled()
+  gtk_x11_dep = dependency('gtk+-x11-3.0', version : '>= 3.10', required : get_option('examples'))
+endif
+# gtk+ quartz backend is only available on macOS
+if host_system == 'darwin'
+  gtk_quartz_dep = dependency('gtk+-quartz-3.0', version : '>= 3.10', required : get_option('examples'))
+else
+  gtk_quartz_dep = dependency('', required : false)
+endif
 
 core_conf.set('HAVE_X', x11_dep.found())
-core_conf.set('HAVE_GIO_UNIX_2_0',
-    (gio_dep.type_name() != 'pkgconfig' and host_machine.system() != 'windows')
-    or giounix_dep.found())
+core_conf.set('HAVE_GIO_UNIX_2_0', giounix_dep.found())
 
 if gio_dep.type_name() == 'pkgconfig'
     core_conf.set_quoted('GIO_MODULE_DIR',
@@ -253,7 +259,7 @@ gst_base_dep = dependency('gstreamer-base-1.0', version : gst_req,
   fallback : ['gstreamer', 'gst_base_dep'])
 gst_net_dep = dependency('gstreamer-net-1.0', version : gst_req,
   fallback : ['gstreamer', 'gst_net_dep'])
-if host_machine.system() != 'windows'
+if host_system != 'windows'
   gst_check_dep = dependency('gstreamer-check-1.0', version : gst_req,
     fallback : ['gstreamer', 'gst_check_dep'])
 endif
@@ -262,20 +268,15 @@ gst_controller_dep = dependency('gstreamer-controller-1.0', version : gst_req,
 
 have_orcc = false
 orcc_args = []
-if get_option('orc') != 'no'
-  need_orc = get_option('orc') == 'yes'
-  # Used by various libraries/elements that use Orc code
-  orc_dep = dependency('orc-0.4', version : orc_req, required : need_orc)
-  orcc = find_program('orcc', required : need_orc)
-  if orc_dep.found() and orcc.found()
-    have_orcc = true
-    orcc_args = [orcc, '--include', 'glib.h']
-    core_conf.set('HAVE_ORC', 1)
-  else
-    message('Orc Compiler not found, will use backup C code')
-    core_conf.set('DISABLE_ORC', 1)
-  endif
+# Used by various libraries/elements that use Orc code
+orc_dep = dependency('orc-0.4', version : orc_req, required : get_option('orc'))
+orcc = find_program('orcc', required : get_option('orc'))
+if orc_dep.found() and orcc.found()
+  have_orcc = true
+  orcc_args = [orcc, '--include', 'glib.h']
+  core_conf.set('HAVE_ORC', 1)
 else
+  message('Orc Compiler not found or disabled, will use backup C code')
   core_conf.set('DISABLE_ORC', 1)
 endif
 
@@ -312,9 +313,9 @@ else
     endif
 endif
 
-gir = find_program('g-ir-scanner', required : false)
+gir = find_program('g-ir-scanner', required : get_option('introspection'))
 gnome = import('gnome')
-build_gir = gir.found() and not meson.is_cross_build() and get_option('introspection')
+build_gir = gir.found() and not meson.is_cross_build()
 gir_init_section = [ '--add-init-section=extern void gst_init(gint*,gchar**);' + \
     'g_setenv("GST_REGISTRY_DISABLE", "yes", TRUE);' + \
     'g_setenv("GST_REGISTRY_1.0", "@0@", TRUE);'.format(meson.current_build_dir() + '/gir_empty_registry.reg') + \
@@ -338,16 +339,15 @@ subdir('tests')
 subdir('pkgconfig')
 
 # xgettext is optional (on Windows for instance)
-if get_option('nls') and find_program('xgettext', required : false).found()
+if find_program('xgettext', required : get_option('nls')).found()
+  core_conf.set('ENABLE_NLS', 1)
   subdir('po')
 endif
 
 if build_machine.system() == 'windows'
   message('Disabling gtk-doc while building on Windows')
-elif not get_option('gtk_doc')
-  message('gtk-doc is disabled via options')
 else
-  if find_program('gtkdoc-scan', required : false).found()
+  if find_program('gtkdoc-scan', required : get_option('gtk_doc')).found()
     subdir('docs')
   else
     message('Not building documentation as gtk-doc was not found')

meson_options.txt

@@ -17,15 +17,49 @@ option('gles2_module_name', type : 'string', value : '',
 option('install_plugins_helper', type: 'string', value: '',
        description: 'Path of distro helper script to call to install missing plugins')
 
+# Feature options for plugins with no external deps
+option('adder', type : 'feature', value : 'auto')
+option('app', type : 'feature', value : 'auto')
+option('audioconvert', type : 'feature', value : 'auto')
+option('audiomixer', type : 'feature', value : 'auto')
+option('audiorate', type : 'feature', value : 'auto')
+option('audioresample', type : 'feature', value : 'auto')
+option('audiotestsrc', type : 'feature', value : 'auto')
+option('encoding', type : 'feature', value : 'auto')
+option('gio', type : 'feature', value : 'auto')
+option('pbtypes', type : 'feature', value : 'auto')
+option('playback', type : 'feature', value : 'auto')
+option('rawparse', type : 'feature', value : 'auto')
+option('subparse', type : 'feature', value : 'auto')
+option('tcp', type : 'feature', value : 'auto')
+option('typefind', type : 'feature', value : 'auto')
+option('videoconvert', type : 'feature', value : 'auto')
+option('videorate', type : 'feature', value : 'auto')
+option('videoscale', type : 'feature', value : 'auto')
+option('videotestsrc', type : 'feature', value : 'auto')
+option('volume', type : 'feature', value : 'auto')
+
+# Feature options for plugins with external deps
+option('alsa', type : 'feature', value : 'auto', description : 'ALSA audio source/sink plugin')
+option('cdparanoia', type : 'feature', value : 'auto', description : 'cdparanoia plugin')
+option('libvisual', type : 'feature', value : 'auto', description : 'libvisual audio visualization plugin')
+option('ogg', type : 'feature', value : 'auto', description : 'ogg parser, muxer, demuxer plugin')
+option('opus', type : 'feature', value : 'auto', description : 'OPUS audio codec plugin')
+option('pango', type : 'feature', value : 'auto', description : 'Pango text rendering and overlay plugin')
+option('theora', type : 'feature', value : 'auto', description : 'Theora video parser and codec plugin')
+option('vorbis', type : 'feature', value : 'auto', description : 'Vorbis audio parser, tagger, and codec plugin')
+option('x11', type : 'feature', value : 'auto', description : 'X11 ximagesink plugin, and X11 support in libraries, plugins, examples')
+option('xshm', type : 'feature', value : 'auto', description : 'X11 shared memory support for X11 plugins')
+option('xvideo', type : 'feature', value : 'auto', description : 'X11 XVideo xvimagesink plugin')
+
+# Common feature options
+option('examples', type : 'feature', value : 'auto', yield : true)
+option('gtk_doc', type : 'feature', value : 'auto', yield : true, description : 'Build API documentation with gtk-doc')
+option('introspection', type : 'feature', value : 'auto', yield : true, description : 'Generate gobject-introspection bindings')
+option('nls', type : 'feature', value : 'auto', yield: true, description : 'Enable native language support (translations)')
+option('orc', type : 'feature', value : 'auto', yield : true)
+
 # Common options
-option('orc', type : 'combo', choices : ['yes', 'no', 'auto'], value : 'auto', yield : true)
-option('examples', type : 'boolean', value : true, yield : true)
-option('gtk_doc', type : 'boolean', value : true, yield : true,
-       description : 'Build API documentation with gtk-doc')
-option('introspection', type : 'boolean', value : true, yield : true,
-        description : 'Generate gobject-introspection bindings')
-option('nls', type : 'boolean', value : true, yield: true,
-        description : 'Enable native language support (translations)')
 option('package-name', type : 'string', yield : true,
        description : 'package name to use in plugins')
 option('package-origin', type : 'string', value : 'Unknown package origin', yield : true,

sys/meson.build

@@ -1,7 +1,7 @@
 if x11_dep.found()
   # XShm is only used by ximage and xvimage
   # FIXME: Need to check for XShmAttach inside libXext
-  xshm_dep = dependency('xext', required : false)
+  xshm_dep = dependency('xext', required : get_option('xshm'))
   core_conf.set('HAVE_XSHM', xshm_dep.found())
 
   subdir('ximage')

sys/xvimage/meson.build

@@ -6,7 +6,7 @@ xvimage_sources = [
   'xvimagesink.c',
 ]
 
-xvideo_dep = dependency('xv', required : false)
+xvideo_dep = dependency('xv', required : get_option('xvideo'))
 core_conf.set('HAVE_XVIDEO', x11_dep.found() and xvideo_dep.found())
 
 if xvideo_dep.found()

tests/examples/gl/sdl/meson.build

@@ -1,4 +1,4 @@
-sdl_dep = dependency('sdl', version : '>=1.2.0', required : false)
+sdl_dep = dependency('sdl', version : '>=1.2.0', required : get_option('examples'))
 if sdl_dep.found() and build_gstgl
   executable('sdlshare',
     'sdlshare.c',