Add meson build script

make build easy with meson

webrtc/meson.build

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+project('gstwebrtc-demo', 'c',
+  meson_version : '>= 0.48',
+  default_options : [ 'warning_level=1',
+                      'buildtype=debug' ])
+
+cc = meson.get_compiler('c')
+
+if cc.get_id() == 'msvc'
+  add_project_arguments(
+      cc.get_supported_arguments(['/utf-8']), # set the input encoding to utf-8
+      language : 'c')
+endif
+
+gst_req = '>= 1.14.0'
+gst_dep = dependency('gstreamer-1.0', version : gst_req,
+  fallback : ['gstreamer', 'gst_dep'])
+gstsdp_dep = dependency('gstreamer-sdp-1.0', version : gst_req,
+    fallback : ['gst-plugins-base', 'sdp_dep'])
+gstwebrtc_dep = dependency('gstreamer-webrtc-1.0', version : gst_req,
+    fallback : ['gst-plugins-bad', 'gstwebrtc_dep'])
+
+libsoup_dep = dependency('libsoup-2.4', version : '>=2.48',
+    fallback : ['libsoup', 'libsoup_dep'])
+json_glib_dep = dependency('json-glib-1.0',
+    fallback : ['json-glib', 'json_glib_dep'])
+
+subdir('multiparty-sendrecv')
+subdir('sendrecv')

webrtc/multiparty-sendrecv/gst/meson.build

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+executable('mp-webrtc-sendrecv',
+           'mp-webrtc-sendrecv.c',
+            dependencies : [gst_dep, gstsdp_dep, gstwebrtc_dep, libsoup_dep, json_glib_dep ])

webrtc/multiparty-sendrecv/meson.build

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+subdir('gst')

webrtc/sendrecv/gst/meson.build

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+executable('webrtc-sendrecv',
+           'webrtc-sendrecv.c',
+            dependencies : [gst_dep, gstsdp_dep, gstwebrtc_dep, libsoup_dep, json_glib_dep ])

webrtc/sendrecv/meson.build

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+subdir('gst')