filter: added new plugin API for filters

The filter API allows us to implement software volume as a pluggable
filter, and we will be able to integrate libraries like SoX.

1 files changed, 39 insertions, 0 deletions

diff --git a/src/filter_registry.c b/src/filter_registry.c
new file mode 100644
index 00000000..90ba6fe1
--- /dev/null
+++ b/src/filter_registry.c
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2003-2009 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "filter_registry.h"
+#include "filter_plugin.h"
+
+#include <stddef.h>
+#include <string.h>
+
+const struct filter_plugin *const filter_plugins[] = {
+	&null_filter_plugin,
+	NULL,
+};
+
+const struct filter_plugin *
+filter_plugin_by_name(const char *name)
+{
+	for (unsigned i = 0; filter_plugins[i] != NULL; ++i)
+		if (strcmp(filter_plugins[i]->name, name) == 0)
+			return filter_plugins[i];
+
+	return NULL;
+}