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-rw-r--r--src/FilterConfig.cxx122
1 files changed, 122 insertions, 0 deletions
diff --git a/src/FilterConfig.cxx b/src/FilterConfig.cxx
new file mode 100644
index 000000000..1b5cf96e9
--- /dev/null
+++ b/src/FilterConfig.cxx
@@ -0,0 +1,122 @@
+/*
+ * Copyright (C) 2003-2013 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 "config.h"
+#include "FilterConfig.hxx"
+#include "conf.h"
+
+extern "C" {
+#include "filter/chain_filter_plugin.h"
+}
+
+#include "filter_plugin.h"
+#include "filter_internal.h"
+#include "filter_registry.h"
+
+#include <string.h>
+
+static GQuark
+filter_quark(void)
+{
+ return g_quark_from_static_string("filter");
+}
+
+/**
+ * Find the "filter" configuration block for the specified name.
+ *
+ * @param filter_template_name the name of the filter template
+ * @param error_r space to return an error description
+ * @return the configuration block, or NULL if none was configured
+ */
+static const struct config_param *
+filter_plugin_config(const char *filter_template_name, GError **error_r)
+{
+ const struct config_param *param = NULL;
+
+ while ((param = config_get_next_param(CONF_AUDIO_FILTER, param)) != NULL) {
+ const char *name =
+ config_get_block_string(param, "name", NULL);
+ if (name == NULL) {
+ g_set_error(error_r, filter_quark(), 1,
+ "filter configuration without 'name' name in line %d",
+ param->line);
+ return NULL;
+ }
+
+ if (strcmp(name, filter_template_name) == 0)
+ return param;
+ }
+
+ g_set_error(error_r, filter_quark(), 1,
+ "filter template not found: %s",
+ filter_template_name);
+
+ return NULL;
+}
+
+/**
+ * Builds a filter chain from a configuration string on the form
+ * "name1, name2, name3, ..." by looking up each name among the
+ * configured filter sections.
+ * @param chain the chain to append filters on
+ * @param spec the filter chain specification
+ * @param error_r space to return an error description
+ * @return the number of filters which were successfully added
+ */
+unsigned int
+filter_chain_parse(struct filter *chain, const char *spec, GError **error_r)
+{
+
+ // Split on comma
+ gchar** tokens = g_strsplit_set(spec, ",", 255);
+
+ unsigned added_filters = 0;
+
+ // Add each name to the filter chain by instantiating an actual filter
+ char **template_names = tokens;
+ while (*template_names != NULL) {
+ struct filter *f;
+ const struct config_param *cfg;
+
+ // Squeeze whitespace
+ g_strstrip(*template_names);
+
+ cfg = filter_plugin_config(*template_names, error_r);
+ if (cfg == NULL) {
+ // The error has already been set, just stop.
+ break;
+ }
+
+ // Instantiate one of those filter plugins with the template name as a hint
+ f = filter_configured_new(cfg, error_r);
+ if (f == NULL) {
+ // The error has already been set, just stop.
+ break;
+ }
+
+ filter_chain_append(chain, f);
+ ++added_filters;
+
+ ++template_names;
+ }
+
+ g_strfreev(tokens);
+
+ return added_filters;
+}