videoconvert: beginnings of video converter

spa/plugins/meson.build

@@ -22,6 +22,9 @@ endif
 if get_option('test')
   subdir('test')
 endif
+if get_option('videoconvert')
+  subdir('videoconvert')
+endif
 if get_option('videotestsrc')
   subdir('videotestsrc')
 endif

spa/plugins/videoconvert/meson.build

@@ -0,0 +1,14 @@
+videoconvert_sources = ['videoadapter.c',
+			'plugin.c']
+
+simd_cargs = []
+simd_dependencies = []
+
+videoconvertlib = shared_library('spa-videoconvert',
+                          videoconvert_sources,
+			  c_args : simd_cargs,
+                          include_directories : [spa_inc],
+                          dependencies : [ mathlib ],
+			  link_with : simd_dependencies,
+                          install : true,
+                          install_dir : '@0@/spa/videoconvert/'.format(get_option('libdir')))

spa/plugins/videoconvert/plugin.c

@@ -0,0 +1,46 @@
+/* Spa videoconvert plugin
+ *
+ * Copyright © 2018 Wim Taymans
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <errno.h>
+
+#include <spa/support/plugin.h>
+
+extern const struct spa_handle_factory spa_videoadapter_factory;
+
+SPA_EXPORT
+int spa_handle_factory_enum(const struct spa_handle_factory **factory, uint32_t *index)
+{
+	spa_return_val_if_fail(factory != NULL, -EINVAL);
+	spa_return_val_if_fail(index != NULL, -EINVAL);
+
+	switch (*index) {
+	case 0:
+		*factory = &spa_videoadapter_factory;
+		break;
+	default:
+		return 0;
+	}
+	(*index)++;
+	return 1;
+}