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diff --git a/extern/audaspace/include/file/IWriter.h b/extern/audaspace/include/file/IWriter.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 IWriter.h
+ * @ingroup file
+ * Defines the IWriter interface as well as Container and Codec types.
+ */
+
+#include "respec/Specification.h"
+
+AUD_NAMESPACE_BEGIN
+
+/// Container formats for writers.
+enum Container
+{
+	CONTAINER_INVALID = 0,
+	CONTAINER_AC3,
+	CONTAINER_FLAC,
+	CONTAINER_MATROSKA,
+	CONTAINER_MP2,
+	CONTAINER_MP3,
+	CONTAINER_OGG,
+	CONTAINER_WAV
+};
+
+/// Audio codecs for writers.
+enum Codec
+{
+	CODEC_INVALID = 0,
+	CODEC_AAC,
+	CODEC_AC3,
+	CODEC_FLAC,
+	CODEC_MP2,
+	CODEC_MP3,
+	CODEC_PCM,
+	CODEC_VORBIS,
+	CODEC_OPUS
+};
+
+/**
+ * @interface IWriter
+ * This class represents a sound sink where audio data can be written to.
+ */
+class AUD_API IWriter
+{
+public:
+	/**
+	 * Destroys the writer.
+	 */
+	virtual ~IWriter() {}
+
+	/**
+	 * Returns how many samples have been written so far.
+	 * \return The writing position as sample count. May be negative if unknown.
+	 */
+	virtual int getPosition() const=0;
+
+	/**
+	 * Returns the specification of the audio data being written into the sink.
+	 * \return The DeviceSpecs structure.
+	 * \note Regardless of the format the input still has to be float!
+	 */
+	virtual DeviceSpecs getSpecs() const=0;
+
+	/**
+	 * Request to write the next length samples out into the sink.
+	 * \param length The count of samples to write.
+	 * \param buffer The pointer to the buffer containing the data.
+	 */
+	virtual void write(unsigned int length, sample_t* buffer)=0;
+};
+
+AUD_NAMESPACE_END