spa: libcamera: add libcamera version check for properties::SystemDevices

spa/meson.build

@@ -94,6 +94,7 @@ if get_option('spa-plugins').allowed()
 
   libcamera_dep = dependency('libcamera', required: get_option('libcamera'))
   summary({'libcamera': libcamera_dep.found()}, bool_yn: true, section: 'Backend')
+  cdata.set('HAVE_LIBCAMERA_SYSTEM_DEVICES', libcamera_dep.version().version_compare('>= 0.1.0'))
 
   compress_offload_option = get_option('compress-offload')
   summary({'Compress-Offload': compress_offload_option.allowed()}, bool_yn: true, section: 'Backend')

spa/plugins/libcamera/libcamera-device.cpp

@@ -4,6 +4,8 @@
 /* SPDX-FileCopyrightText: Copyright © 2021 Wim Taymans <wim.taymans@gmail.com> */
 /* SPDX-License-Identifier: MIT */
 
+#include "config.h"
+
 #include <stddef.h>
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -59,10 +61,12 @@ struct impl {
 static const libcamera::Span<const int64_t> cameraDevice(
 			const Camera *camera)
 {
+#ifdef HAVE_LIBCAMERA_SYSTEM_DEVICES
 	const ControlList &props = camera->properties();
 
 	if (auto devices = props.get(properties::SystemDevices))
 		return devices.value();
+#endif
 
 	return {};
 }

spa/plugins/libcamera/meson.build

@@ -7,6 +7,7 @@ libcamera_sources = [
 
 libcameralib = shared_library('spa-libcamera',
   libcamera_sources,
+  include_directories : [ configinc ],
   dependencies : [ spa_dep, libudev_dep, libcamera_dep, pthread_lib  ],
   install : true,
   install_dir : spa_plugindir / 'libcamera')