meson: Add a top-level option to enable webrtc

There are a bunch of plugins that you need for webrtc support, and
it's not obvious at all to users which those are.

With this commit, srtp, sctp and dtls options will be auto-enabled if
the webrtc option is enabled.

Requires meson 1.1

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5505>

meson.build

@@ -1,6 +1,6 @@
 project('gstreamer-full', 'c',
   version : '1.23.0.1',
-  meson_version : '>= 0.63.0',
+  meson_version : '>= 1.1',
   default_options : ['buildtype=debugoptimized',
                      # Needed due to https://github.com/mesonbuild/meson/issues/1889,
                      # but this can cause problems in the future. Remove it

meson_options.txt

@@ -57,6 +57,7 @@ option('doc', type : 'feature', value : 'disabled', description : 'Generate API
 option('gtk_doc', type : 'feature', value : 'disabled', description : 'Generate API documentation with gtk-doc')
 option('qt5', type : 'feature', value : 'auto', description : 'Qt5 toolkit support')
 option('qt6', type : 'feature', value : 'auto', description : 'Qt6 toolkit support')
+option('webrtc', type : 'feature', value : 'auto', description : 'WebRTC support')
 
 option('package-origin', type : 'string', value : 'Unknown package origin', yield : true,
        description : 'package origin URL to use in plugins')

subprojects/gst-plugins-bad/ext/dtls/meson.build

@@ -12,8 +12,9 @@ dtls_sources = [
   'gstdtlselement.c',
 ]
 
-openssl_dep = dependency('openssl', version : '>= 1.0.1', required : get_option('dtls'))
+dtls_option = get_option('dtls').enable_if(get_option('webrtc').enabled(), error_message: 'webrtc option is enabled')
-libcrypto_dep = dependency('libcrypto', required : get_option('dtls'))
+openssl_dep = dependency('openssl', version: '>= 1.0.1', required: dtls_option)
+libcrypto_dep = dependency('libcrypto', required: dtls_option)
 
 if openssl_dep.found() and libcrypto_dep.found()
   gstdtls = library('gstdtls',

subprojects/gst-plugins-bad/ext/sctp/meson.build

@@ -5,7 +5,8 @@ sctp_sources = [
   'sctpassociation.c'
 ]
 
-if get_option('sctp').disabled()
+sctp_option = get_option('sctp').enable_if(get_option('webrtc').enabled(), error_message: 'webrtc option is enabled')
+if sctp_option.disabled()
   subdir_done()
 endif
 
@@ -23,7 +24,7 @@ if not get_option('sctp-internal-usrsctp').enabled()
   found_system_usrsctp = sctp_dep.found() and sctp_header
 
   if get_option('sctp-internal-usrsctp').disabled() and not found_system_usrsctp
-    if get_option('sctp').enabled()
+    if sctp_option.enabled()
       error('sctp plugin enabled but could not find libusrsctp or usrsctp.h, and internal libusrsctp disabled')
     else
       message('Could not find libusrsctp or usrsctp.h, and internal libusrsctp disabled - not building sctp plugin')
@@ -37,7 +38,7 @@ if not found_system_usrsctp
   subdir('usrsctp')
   sctp_dep = usrsctp_dep
   sctp_header = true
-  if get_option('sctp').enabled() and not sctp_dep.found()
+  if sctp_option.enabled() and not sctp_dep.found()
     error('sctp plugin enabled but could not find system libusrsctp or configure internal libusrsctp')
   endif
 endif

subprojects/gst-plugins-bad/ext/srtp/meson.build

@@ -7,7 +7,8 @@ srtp_sources = [
 ]
 
 srtp_cargs = []
-if get_option('srtp').disabled()
+srtp_option = get_option('srtp').enable_if(get_option('webrtc').enabled(), error_message: 'webrtc option is enabled')
+if srtp_option.disabled()
   srtp_dep = dependency('', required : false)
   subdir_done()
 endif
@@ -21,7 +22,7 @@ else
     srtp_dep = cc.find_library('srtp', required : false)
   endif
 endif
-if not srtp_dep.found() and get_option('srtp').enabled()
+if not srtp_dep.found() and srtp_option.enabled()
   error('srtp plugin enabled but libsrtp not found')
 endif
 

subprojects/gst-plugins-bad/meson.build

@@ -1,6 +1,6 @@
 project('gst-plugins-bad', 'c', 'cpp',
   version : '1.23.0.1',
-  meson_version : '>= 0.62',
+  meson_version : '>= 1.1',
   default_options : [ 'warning_level=1',
                       'buildtype=debugoptimized' ])
 

subprojects/gst-plugins-bad/meson_options.txt

@@ -180,7 +180,7 @@ option('vulkan', type : 'feature', value : 'auto', description : 'Vulkan video s
 option('wasapi', type : 'feature', value : 'auto', description : 'Windows Audio Session API source/sink plugin')
 option('wasapi2', type : 'feature', value : 'auto', description : 'Windows Audio Session API source/sink plugin with WinRT API')
 option('webp', type : 'feature', value : 'auto', description : 'WebP image codec plugin')
-option('webrtc', type : 'feature', value : 'auto', description : 'WebRTC audio/video network bin plugin')
+option('webrtc', type : 'feature', value : 'auto', yield: true, description : 'WebRTC audio/video network bin plugin')
 option('webrtcdsp', type : 'feature', value : 'auto', description : 'Plugin with various audio filters provided by the WebRTC audio processing library')
 option('wildmidi', type : 'feature', value : 'auto', description : 'WildMidi midi soft synth plugin')
 option('wic', type : 'feature', value : 'auto', description : 'Windows Imaging Component plugin')