pulse-server: split out media roles

Part of !776.

src/modules/module-protocol-pulse/media-roles.h

@@ -0,0 +1,50 @@
+/* PipeWire
+ *
+ * Copyright © 2020 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.
+ */
+
+#ifndef PULSE_SERVER_MEDIA_ROLES_H
+#define PULSE_SERVER_MEDIA_ROLES_H
+
+#include <stddef.h>
+
+#include <spa/utils/string.h>
+
+struct str_map {
+	const char *pw_str;
+	const char *pa_str;
+	const struct str_map *child;
+};
+
+extern const struct str_map media_role_map[];
+
+static inline const struct str_map *str_map_find(const struct str_map *map, const char *pw, const char *pa)
+{
+	size_t i;
+	for (i = 0; map[i].pw_str; i++)
+		if ((pw && spa_streq(map[i].pw_str, pw)) ||
+		    (pa && spa_streq(map[i].pa_str, pa)))
+			return &map[i];
+	return NULL;
+}
+
+#endif /* PULSE_SERVER_MEDIA_ROLES_H */