encoder/Configured: glue code to initialize PreparedEncoder

src/encoder/Configured.cxx

@@ -0,0 +1,57 @@
+/*
+ * Copyright 2003-2017 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 "Configured.hxx"
+#include "EncoderList.hxx"
+#include "EncoderPlugin.hxx"
+#include "config/Block.hxx"
+#include "util/StringAPI.hxx"
+#include "util/RuntimeError.hxx"
+
+static const EncoderPlugin &
+GetConfiguredEncoderPlugin(const ConfigBlock &block, bool shout_legacy)
+{
+	const char *name = block.GetBlockValue("encoder", nullptr);
+	if (name == nullptr && shout_legacy)
+		name = block.GetBlockValue("encoding", nullptr);
+
+	if (name == nullptr)
+		name = "vorbis";
+
+	if (shout_legacy) {
+		if (StringIsEqual(name, "ogg"))
+			name = "vorbis";
+		else if (StringIsEqual(name, "mp3"))
+			name = "lame";
+	}
+
+	const auto plugin = encoder_plugin_get(name);
+	if (plugin == nullptr)
+		throw FormatRuntimeError("No such encoder: %s", name);
+
+	return *plugin;
+}
+
+PreparedEncoder *
+CreateConfiguredEncoder(const ConfigBlock &block, bool shout_legacy)
+{
+	return encoder_init(GetConfiguredEncoderPlugin(block, shout_legacy),
+			    block);
+}