Filter*: move to filter/

1 files changed, 108 insertions, 0 deletions

diff --git a/src/filter/FilterConfig.cxx b/src/filter/FilterConfig.cxx
new file mode 100644
index 000000000..5f2c3a95b
--- /dev/null
+++ b/src/filter/FilterConfig.cxx
@@ -0,0 +1,108 @@
+/*
+ * Copyright (C) 2003-2014 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 "plugins/ChainFilterPlugin.hxx"
+#include "FilterPlugin.hxx"
+#include "config/ConfigData.hxx"
+#include "config/ConfigOption.hxx"
+#include "config/ConfigGlobal.hxx"
+#include "config/ConfigError.hxx"
+#include "util/Error.hxx"
+
+#include <algorithm>
+
+#include <string.h>
+
+/**
+ * Find the "filter" configuration block for the specified name.
+ *
+ * @param filter_template_name the name of the filter template
+ * @param error space to return an error description
+ * @return the configuration block, or nullptr if none was configured
+ */
+static const struct config_param *
+filter_plugin_config(const char *filter_template_name, Error &error)
+{
+	const struct config_param *param = nullptr;
+
+	while ((param = config_get_next_param(CONF_AUDIO_FILTER, param)) != nullptr) {
+		const char *name = param->GetBlockValue("name");
+		if (name == nullptr) {
+			error.Format(config_domain,
+				     "filter configuration without 'name' name in line %d",
+				     param->line);
+			return nullptr;
+		}
+
+		if (strcmp(name, filter_template_name) == 0)
+			return param;
+	}
+
+	error.Format(config_domain,
+		     "filter template not found: %s",
+		     filter_template_name);
+	return nullptr;
+}
+
+static bool
+filter_chain_append_new(Filter &chain, const char *template_name, Error &error)
+{
+	const struct config_param *cfg =
+		filter_plugin_config(template_name, error);
+	if (cfg == nullptr)
+		// The error has already been set, just stop.
+		return false;
+
+	// Instantiate one of those filter plugins with the template name as a hint
+	Filter *f = filter_configured_new(*cfg, error);
+	if (f == nullptr)
+		// The error has already been set, just stop.
+		return false;
+
+	const char *plugin_name = cfg->GetBlockValue("plugin",
+						     "unknown");
+	filter_chain_append(chain, plugin_name, f);
+
+	return true;
+}
+
+bool
+filter_chain_parse(Filter &chain, const char *spec, Error &error)
+{
+	const char *const end = spec + strlen(spec);
+
+	while (true) {
+		const char *comma = std::find(spec, end, ',');
+		if (comma > spec) {
+			const std::string name(spec, comma);
+			if (!filter_chain_append_new(chain, name.c_str(),
+						     error))
+				return false;
+		}
+
+		if (comma == end)
+			break;
+
+		spec = comma + 1;
+	}
+
+	return true;
+}