Install libnice separately from Janus

tasks/main.yml

@@ -22,11 +22,18 @@
     ustreamer_install_janus: "{{ ustreamer_h264_sink != None }}"
 
 # If the `build uStreamer` step should be run with the `WITH_JANUS` option, we
-# need to install the Janus Debian package beforehand, because it provides
-# C-headers.
+# need to install the Janus Debian package and its dependencies beforehand,
+# because Janus provides C headers that uStreamer needs for the `WITH_JANUS`
+# build option.
 - name: install Janus Debian package
   apt:
-    deb: "{{ ustreamer_janus_deb_file }}"
+    deb: "{{ item }}"
+  with_items:
+    # Janus requires libnice 0.1.18 or later, which is not currently available
+    # from the Raspbian apt repositories, so we install an explicit libnice
+    # Debian package from URL.
+    - "{{ ustreamer_libnice_deb_file }}"
+    - "{{ ustreamer_janus_deb_file }}"
   tags:
     - janus
   when: ustreamer_install_janus

vars/main.yml

@@ -3,5 +3,6 @@
 ustreamer_settings_file: /home/{{ ustreamer_user }}/config.yml
 
 # These variables are only used within this role.
-ustreamer_janus_deb_file: https://github.com/tiny-pilot/janus-debian/releases/download/1.0.1-20221104/janus_1.0.1-20221104_armhf.deb
+ustreamer_libnice_deb_file: https://github.com/tiny-pilot/libnice-debian/releases/download/0.1.18-202211161620/libnice10_0.1.18-202211161620_armhf.deb
+ustreamer_janus_deb_file: # TODO
 ustreamer_janus_install_dir: /opt/janus