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

14 files changed, 145 insertions, 61 deletions

diff --git a/sys/bluez/meson.build b/sys/bluez/meson.build
index 373feaea2..19386f3b2 100644
--- a/sys/bluez/meson.build
+++ b/sys/bluez/meson.build
@@ -7,21 +7,16 @@ bluez_sources = [
   'gstavrcputil.c',
 ]
 
-bluez_dep = dependency('bluez', version : '>= 5.0', required : false)
-gio_unix_dep = dependency('gio-unix-2.0', version : glib_req, required : false)
+bluez_dep = dependency('bluez', version : '>= 5.0', required : get_option('bluez'))
+gio_unix_dep = dependency('gio-unix-2.0', version : glib_req,
+                          fallback: ['glib', 'libgiounix_dep'],
+                          required : get_option('bluez'))
 
 if bluez_dep.found() and gio_unix_dep.found()
-  # FIXME: do we really need the meson.current_build_dir() here? Shouldn't
-  # the custom command be executed with the current build directoy as working
-  # directory? Without this, bluez.[ch] are created in the top-level build dir!
-  bluez_ch = custom_target('bluez_ch',
-    output : [ 'bluez.h', 'bluez.c' ] ,
-    input : 'org.bluez.xml',
-    command : [ find_program('gdbus-codegen'),
-                '--c-namespace=Bluez',
-                '--generate-c-code=' + meson.current_build_dir() + '/bluez',
-                '--interface-prefix=org.bluez',
-                '@INPUT@' ])
+  bluez_ch = gnome.gdbus_codegen('bluez-interface',
+      sources : 'org.bluez.xml',
+      interface_prefix : 'org.bluez',
+      namespace : 'Bluez')
 
   gstbluez = library('gstbluez',
     bluez_sources, bluez_ch,
diff --git a/sys/d3dvideosink/meson.build b/sys/d3dvideosink/meson.build
index 26c34b7c2..c9230dabd 100644
--- a/sys/d3dvideosink/meson.build
+++ b/sys/d3dvideosink/meson.build
@@ -3,14 +3,23 @@ d3dvideosink_sources = [
   'd3dvideosink.c',
 ]
 
-if host_system == 'windows' and cc.has_header('d3d9.h')
-  d3dvideosink_dep = [cc.find_library('d3d9'), cc.find_library('gdi32')]
+if host_system != 'windows' or get_option('d3dvideosink').disabled()
+  subdir_done()
+endif
+
+d3d_dep = cc.find_library('d3d9', required : get_option('d3dvideosink'))
+gdi_dep = cc.find_library('gdi32', required : get_option('d3dvideosink'))
+have_d3d9_h = cc.has_header('d3d9.h')
+if not have_d3d9_h and get_option('d3dvideosink').enabled()
+  error('d3dvideosink plugin enabled but d3d9.h not found')
+endif
 
+if d3d_dep.found() and gdi_dep.found() and have_d3d9_h
   gstd3dvideosink = library('gstd3d',
     d3dvideosink_sources,
     c_args : gst_plugins_bad_args,
     include_directories : [configinc],
-    dependencies : [gstvideo_dep] + d3dvideosink_dep,
+    dependencies : [gstvideo_dep, d3d_dep, gdi_dep],
     install : true,
     install_dir : plugins_install_dir)
   pkgconfig.generate(gstd3dvideosink, install_dir : plugins_pkgconfig_install_dir)
diff --git a/sys/decklink/meson.build b/sys/decklink/meson.build
index 3cb4bdaeb..78644374f 100644
--- a/sys/decklink/meson.build
+++ b/sys/decklink/meson.build
@@ -6,15 +6,19 @@ decklink_sources = [
   'gstdecklinkvideosrc.cpp',
 ]
 
+if get_option('decklink').disabled()
+  subdir_done()
+endif
+
 build_decklink = false
 decklink_ldflags = []
 decklink_libs = []
 
-if host_machine.system() == 'windows'
+if host_system == 'windows'
   decklink_sources += ['win/DeckLinkAPIDispatch.cpp', 'win/DeckLinkAPI_i.c']
   if cxx.get_id() == 'msvc'
     # FIXME: Use commsuppwd.lib for debug builds?
-    comutil_dep = cxx.find_library('comsuppw')
+    comutil_dep = cxx.find_library('comsuppw', required : get_option('decklink'))
     if comutil_dep.found()
       build_decklink = true
       decklink_libs = [comutil_dep]
@@ -23,7 +27,7 @@ if host_machine.system() == 'windows'
     build_decklink = true
   endif
 else
-  libdl = cc.find_library('dl', required: false)
+  libdl = cc.find_library('dl', required: get_option('decklink'))
   have_pthread_h = cdata.has('HAVE_PTHREAD_H')
   if libdl.found() and have_pthread_h
     decklink_libs = [libm, libdl, dependency('threads')]
diff --git a/sys/directsound/meson.build b/sys/directsound/meson.build
index 03ec447a4..9e7f1325e 100644
--- a/sys/directsound/meson.build
+++ b/sys/directsound/meson.build
@@ -12,14 +12,24 @@ directsoundsrc_device_flags = [
   '-DGST_DIRECTSOUND_SRC_DEVICE_PROVIDER=1'
 ]
 
-if host_system == 'windows' and cc.has_header('dsound.h')
-  directsoundsrc_dep = [cc.find_library('dsound'), cc.find_library('winmm'), cc.find_library('ole32')]
+if host_system != 'windows' or get_option('directsound').disabled()
+  subdir_done()
+endif
+
+dsound_dep = cc.find_library('dsound', required : get_option('directsound'))
+winmm_dep = cc.find_library('winmm', required : get_option('directsound'))
+ole32_dep = cc.find_library('ole32', required : get_option('directsound'))
+have_dsound_h = cc.has_header('dsound.h')
+if not have_dsound_h and get_option('directsound').enabled()
+  error('directsound plugin enabled but dsound.h not found')
+endif
 
+if dsound_dep.found() and winmm_dep.found() and ole32_dep.found() and have_dsound_h
   gstdirectsoundsrc = library('gstdirectsoundsrc',
     directsoundsrc_sources,
     c_args : gst_plugins_bad_args + directsoundsrc_device_flags,
     include_directories : [configinc],
-    dependencies : [gstaudio_dep] + directsoundsrc_dep,
+    dependencies : [gstaudio_dep, dsound_dep, winmm_dep, ole32_dep],
     install : true,
     install_dir : plugins_install_dir)
   pkgconfig.generate(gstdirectsoundsrc, install_dir : plugins_pkgconfig_install_dir)
diff --git a/sys/dvb/meson.build b/sys/dvb/meson.build
index 5d3e7d1f5..d8b496b2a 100644
--- a/sys/dvb/meson.build
+++ b/sys/dvb/meson.build
@@ -15,18 +15,22 @@ dvb_sources = [
   'parsechannels.c',
 ]
 
-dvb_check_code_lines = [
-  '#include <linux/dvb/version.h>\n\n',
-  '#if DVB_API_VERSION < 5 || (DVB_API_VERSION == 5 && DVB_API_VERSION_MINOR <= 4)\n\n',
-  '#error "Incompatible dvb API"\n\n',
-  '#endif',
-]
-dvb_check_code=''
-foreach l : dvb_check_code_lines
-  dvb_check_code = dvb_check_code + l
-endforeach
+if get_option('dvb').disabled()
+  subdir_done()
+endif
+
+dvb_check_code = '''
+#include <linux/dvb/version.h>
+#if DVB_API_VERSION < 5 || (DVB_API_VERSION == 5 && DVB_API_VERSION_MINOR <= 4)
+#error "Incompatible dvb API"
+#endif'
+'''
+have_dvb = cc.compiles(dvb_check_code)
+if not have_dvb and get_option('dvb').enabled()
+  error('DVB plugin enabled but dvb headers not found')
+endif
 
-if cc.compiles(dvb_check_code)
+if have_dvb
   gstdvb = library('gstdvb',
     dvb_sources,
     c_args : gst_plugins_bad_args + [ '-DGST_USE_UNSTABLE_API' ],
diff --git a/sys/fbdev/meson.build b/sys/fbdev/meson.build
index 1aed2ad38..84ee057f0 100644
--- a/sys/fbdev/meson.build
+++ b/sys/fbdev/meson.build
@@ -2,7 +2,16 @@ fbdevsink_sources = [
   'gstfbdevsink.c',
 ]
 
-if cc.has_header('linux/fb.h')
+if get_option('fbdev').disabled()
+  subdir_done()
+endif
+
+have_fb_h = cc.has_header('linux/fb.h')
+if not have_fb_h and get_option('fbdev').enabled()
+  error('fbdev plugin enabled but fb.h not found')
+endif
+
+if have_fb_h
   gstfbdevsink = library('gstfbdevsink',
     fbdevsink_sources,
     c_args : gst_plugins_bad_args,
diff --git a/sys/ipcpipeline/meson.build b/sys/ipcpipeline/meson.build
index 3ebf58ed2..1ea4c69f4 100644
--- a/sys/ipcpipeline/meson.build
+++ b/sys/ipcpipeline/meson.build
@@ -6,8 +6,25 @@ ipcpipeline_sources = [
   'gstipcslavepipeline.c'
 ]
 
-if cc.has_header ('sys/socket.h') and cc.has_function ('pipe') and cc.has_function ('socketpair')
+if get_option('ipcpipeline').disabled()
+  subdir_done()
+endif
 
+have_socket_h = cc.has_header('sys/socket.h')
+if not have_socket_h and get_option('ipcpipeline').enabled()
+  error('ipcpipeline plugin enabled but socket.h not found')
+endif
+have_pipe = cc.has_function('pipe')
+if not have_pipe and get_option('ipcpipeline').enabled()
+  error('ipcpipeline plugin enabled but pipe() not found')
+endif
+have_socketpair = cc.has_function('socketpair')
+if not have_socketpair and get_option('ipcpipeline').enabled()
+  error('ipcpipeline plugin enabled but socketpair() not found')
+endif
+
+
+if have_socket_h and have_pipe and have_socketpair
   gstipcpipeline = library('gstipcpipeline',
     ipcpipeline_sources,
     c_args : gst_plugins_bad_args,
@@ -17,5 +34,4 @@ if cc.has_header ('sys/socket.h') and cc.has_function ('pipe') and cc.has_functi
     install_dir : plugins_install_dir,
   )
   pkgconfig.generate(gstipcpipeline, install_dir : plugins_pkgconfig_install_dir)
-
 endif
diff --git a/sys/kms/meson.build b/sys/kms/meson.build
index 4a3f5435f..fbc18617e 100644
--- a/sys/kms/meson.build
+++ b/sys/kms/meson.build
@@ -5,8 +5,7 @@ kmssink_sources = [
   'gstkmsutils.c',
 ]
 
-libdrm_dep = dependency('libdrm', version : '>= 2.4.55', required : false)
-
+libdrm_dep = dependency('libdrm', version : '>= 2.4.55', required : get_option('kms'))
 if libdrm_dep.found()
   gstkmssink = library('gstkms',
     kmssink_sources,
diff --git a/sys/msdk/meson.build b/sys/msdk/meson.build
index 049d17fc1..a08d8ca61 100644
--- a/sys/msdk/meson.build
+++ b/sys/msdk/meson.build
@@ -30,6 +30,7 @@ else
   msdk_sources += ['msdk_libva.c', 'gstmsdkallocator_libva.c']
 endif
 
+# FIXME: automagic
 msdk_root = run_command(python3, '-c', 'import os; print(os.environ.get("INTELMEDIASDKROOT", os.environ.get("MFX_HOME", "")))').stdout().strip()
 
 have_msdk = false
diff --git a/sys/shm/meson.build b/sys/shm/meson.build
index 7ae72f353..6f573cfbf 100644
--- a/sys/shm/meson.build
+++ b/sys/shm/meson.build
@@ -6,25 +6,35 @@ shm_sources = [
   'gstshmsink.c',
 ]
 
-shm_enabled = false
+if get_option('shm').disabled()
+  subdir_done()
+endif
+
 shm_deps = []
-rt_dep = cc.find_library ('rt', required: false)
+if ['osx', 'bsd'].contains(host_system)
+  rt_dep = []
+  shm_enabled = true
+else
+  rt_dep = cc.find_library ('rt', required: false)
+  shm_enabled = rt_dep.found()
+endif
 
-if cc.has_header ('sys/socket.h') and (host_system == 'osx' or
-    host_system == 'bsd' or rt_dep.found())
+if shm_enabled
+  shm_enabled = cc.has_header('sys/socket.h')
+elif get_option('shm').enabled()
+  error('shm plugin enabled but librt not found')
+endif
 
-  shm_enabled = true
-  shm_deps = [gstbase_dep]
+if not shm_enabled and get_option('shm').enabled()
+  error('shm plugin enabled but socket.h not found')
+endif
 
-  if rt_dep.found()
-    shm_deps += [rt_dep]
-  endif
-  
+if shm_enabled
   gstshm = library('gstshm',
     shm_sources,
     c_args : gst_plugins_bad_args + ['-DSHM_PIPE_USE_GLIB'],
     include_directories : [configinc],
-    dependencies : shm_deps,
+    dependencies : [gstbase_dep, rt_dep],
     install : true,
     install_dir : plugins_install_dir,
   )
diff --git a/sys/uvch264/meson.build b/sys/uvch264/meson.build
index c4f100179..f2cc31386 100644
--- a/sys/uvch264/meson.build
+++ b/sys/uvch264/meson.build
@@ -5,9 +5,12 @@ uvch264_sources = [
   'uvc_h264.c',
 ]
 
-libgudev_dep = dependency('gudev-1.0', required : false)
-libusb_dep = dependency('libusb-1.0', required : false)
+libgudev_dep = dependency('gudev-1.0', required : get_option('uvch264'))
+libusb_dep = dependency('libusb-1.0', required : get_option('uvch264'))
 has_uvcvideo_h = cc.has_header('linux/uvcvideo.h')
+if not has_uvcvideo_h and get_option('uvch264').enabled()
+  error('uvch264 plugin enabled but uvcvideo.h not found')
+endif
 
 if libgudev_dep.found() and libusb_dep.found() and has_uvcvideo_h
   gstuvch264 = library('gstuvch264',
diff --git a/sys/wasapi/meson.build b/sys/wasapi/meson.build
index c5b47dd03..cf57d8784 100644
--- a/sys/wasapi/meson.build
+++ b/sys/wasapi/meson.build
@@ -6,15 +6,27 @@ wasapi_sources = [
   'gstwasapidevice.c',
 ]
 
-if host_system == 'windows' and cc.has_header('audioclient.h')
-  wasapi_dep = [cc.find_library('ole32'), cc.find_library('ksuser'),
-                cc.find_library('avrt', required : false)]
+if host_system != 'windows'
+  if get_option('wasapi').disabled()
+    subdir_done()
+  elif get_option('wasapi').enabled()
+    error('Cannot build wasapi plugin when not building for Windows')
+  endif
+endif
+
+ole32_dep = cc.find_library('ole32', required : get_option('wasapi'))
+ksuser_dep = cc.find_library('ksuser', required : get_option('wasapi'))
+have_audioclient_h = cc.has_header('audioclient.h')
+if not have_audioclient_h and get_option('wasapi').enabled()
+  error('wasapi plugin enabled but audioclient.h not found')
+endif
 
+if ole32_dep.found() and ksuser_dep.found() and have_audioclient_h
   gstwasapi = library('gstwasapi',
     wasapi_sources,
     c_args : gst_plugins_bad_args + ['-DCOBJMACROS'],
     include_directories : [configinc],
-    dependencies : [gstaudio_dep] + wasapi_dep,
+    dependencies : [gstaudio_dep, ole32_dep, ksuser_dep],
     install : true,
     install_dir : plugins_install_dir)
   pkgconfig.generate(gstwasapi, install_dir : plugins_pkgconfig_install_dir)
diff --git a/sys/winks/meson.build b/sys/winks/meson.build
index 59036a184..eea1a31a9 100644
--- a/sys/winks/meson.build
+++ b/sys/winks/meson.build
@@ -8,9 +8,12 @@ winks_sources = [
 ]
 
 if host_system == 'windows'
-  winks_dep = [cc.find_library('ksuser'), cc.find_library('uuid'),
-               cc.find_library('strmiids'), cc.find_library('dxguid'),
-               cc.find_library('setupapi'), cc.find_library('ole32')]
+  winks_dep = [cc.find_library('ksuser', required : get_option('winks')),
+               cc.find_library('uuid', required : get_option('winks')),
+               cc.find_library('strmiids', required : get_option('winks')),
+               cc.find_library('dxguid', required : get_option('winks')),
+               cc.find_library('setupapi', required : get_option('winks')),
+               cc.find_library('ole32', required : get_option('winks'))]
 
   gstwinks = library('gstwinks',
     winks_sources,
diff --git a/sys/winscreencap/meson.build b/sys/winscreencap/meson.build
index ad1a2e200..6f3511c58 100644
--- a/sys/winscreencap/meson.build
+++ b/sys/winscreencap/meson.build
@@ -4,14 +4,23 @@ winscreencap_sources = [
   'gstwinscreencap.c',
 ]
 
-if host_system == 'windows' and cc.has_header('d3d9.h')
-  winscreencap_dep = [cc.find_library('d3d9'), cc.find_library('gdi32')]
+if host_system != 'windows' or get_option('winscreencap').disabled()
+  subdir_done()
+endif
+
+d3d_dep = cc.find_library('d3d9', required : get_option('winscreencap'))
+gdi_dep = cc.find_library('gdi32', required : get_option('winscreencap'))
+have_d3d9_h = cc.has_header('d3d9.h')
+if not have_d3d9_h and get_option('winscreencap').enabled()
+  error('winscreencap plugin enabled but d3d9.h not found')
+endif
 
+if d3d_dep.found() and gdi_dep.found() and have_d3d9_h
   gstwinscreencap = library('gstwinscreencap',
     winscreencap_sources,
     c_args : gst_plugins_bad_args,
     include_directories : [configinc],
-    dependencies : [gstbase_dep, gstvideo_dep] + winscreencap_dep,
+    dependencies : [gstbase_dep, gstvideo_dep, d3d_dep, gdi_dep],
     install : true,
     install_dir : plugins_install_dir,
   )