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diff --git a/extern/audaspace/include/file/FileWriter.h b/extern/audaspace/include/file/FileWriter.h
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+++ b/extern/audaspace/include/file/FileWriter.h
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+/*******************************************************************************
+ * Copyright 2009-2016 Jörg Müller
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ ******************************************************************************/
+
+#pragma once
+
+/**
+ * @file FileWriter.h
+ * @ingroup file
+ * The FileWriter class.
+ */
+
+#include "respec/Specification.h"
+#include "file/IWriter.h"
+
+#include <string>
+#include <vector>
+#include <memory>
+
+AUD_NAMESPACE_BEGIN
+
+class IReader;
+
+/**
+ * The FileWriter class is able to create IWriter classes as well as write readers to them.
+ */
+class AUD_API FileWriter
+{
+private:
+	// hide default constructor, copy constructor and operator=
+	FileWriter() = delete;
+	FileWriter(const FileWriter&) = delete;
+	FileWriter& operator=(const FileWriter&) = delete;
+
+public:
+	/**
+	 * Creates a new IWriter.
+	 * \param filename The file to write to.
+	 * \param specs The file's audio specification.
+	 * \param format The file's container format.
+	 * \param codec The codec used for encoding the audio data.
+	 * \param bitrate The bitrate for encoding.
+	 * \return The writer to write data to.
+	 */
+	static std::shared_ptr<IWriter> createWriter(std::string filename, DeviceSpecs specs, Container format, Codec codec, unsigned int bitrate);
+
+	/**
+	 * Writes a reader to a writer.
+	 * \param reader The reader to read from.
+	 * \param writer The writer to write to.
+	 * \param length How many samples should be transferred.
+	 * \param buffersize How many samples should be transferred at once.
+	 */
+	static void writeReader(std::shared_ptr<IReader> reader, std::shared_ptr<IWriter> writer, unsigned int length, unsigned int buffersize);
+
+	/**
+	 * Writes a reader to several writers.
+	 * \param reader The reader to read from.
+	 * \param writers The writers to write to.
+	 * \param length How many samples should be transferred.
+	 * \param buffersize How many samples should be transferred at once.
+	 */
+	static void writeReader(std::shared_ptr<IReader> reader, std::vector<std::shared_ptr<IWriter> >& writers, unsigned int length, unsigned int buffersize);
+};
+
+AUD_NAMESPACE_END