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diff --git a/extern/audaspace/include/util/FFTPlan.h b/extern/audaspace/include/util/FFTPlan.h
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+/*******************************************************************************
+* Copyright 2015-2016 Juan Francisco Crespo Galán
+*
+* 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 FFTPlan.h
+* @ingroup util
+* The FFTPlan class.
+*/
+
+#include <complex>
+#include <fftw3.h>
+#include "Audaspace.h"
+
+#include <memory>
+#include <vector>
+
+/**Default FFT size.*/
+#define DEFAULT_N 4096
+
+AUD_NAMESPACE_BEGIN
+
+/**
+* Thas class represents an plan object that allows to calculate FFTs and IFFTs.
+*/
+class AUD_API FFTPlan
+{
+private:
+	/**
+	* The size of the FFT plan.
+	*/
+	int m_N;
+
+	/**
+	* The plan to transform the input to the frequency domain.
+	*/
+	fftwf_plan m_fftPlanR2C;
+
+	/**
+	* The plan to transform the input to the time domain again.
+	*/
+	fftwf_plan m_fftPlanC2R;
+
+	/**
+	* The size of a buffer for its use with the FFT plan (in bytes).
+	*/
+	unsigned int m_bufferSize;
+
+	// delete copy constructor and operator=
+	FFTPlan(const FFTPlan&) = delete;
+	FFTPlan& operator=(const FFTPlan&) = delete;
+
+public:
+	/**
+	* Creates a new FFTPlan object with DEFAULT_N size (4096).
+	* \param measureTime The aproximate amount of seconds that FFTW will spend searching for the optimal plan,
+	*		which means faster FFTs and IFFTs while using this plan. If measureTime is negative, it will take all the time it needs.
+	*/
+	FFTPlan(double measureTime = 0);
+
+	/**
+	* Creates a new FFTPlan object with a custom size.
+	* \param n The size of the FFT plan. Values that are a power of two are faster. 
+	*		The useful range usually is between 2048 and 8192, but bigger values can be useful
+	*		in certain situations (when using the StreamBuffer class per example). 
+	*		Generally, low values use more CPU power and are a bit faster than large ones, 
+	*		there is also a huge decrease in efficiency when n is lower than 2048.
+	* \param measureTime The aproximate amount of seconds that FFTW will spend searching for the optimal plan,
+	*		which means faster FFTs while using this plan. If measureTime is negative, it will take all the time it needs.
+	*/
+	FFTPlan(int n, double measureTime = 0);
+	~FFTPlan();
+
+	/**
+	* Retrieves the size of the FFT plan.
+	* \return The size of the plan.
+	*/
+	int getSize();
+
+	/**
+	* Calculates the FFT of an input buffer with the current plan.
+	* \param[in,out] buffer A buffer with the input data an in which the output data will be written.
+	*/
+	void FFT(void* buffer);
+
+	/**
+	* Calculates the IFFT of an input buffer with the current plan.
+	* \param[in,out] buffer A buffer with the input data an in which the output data will be written.
+	*/
+	void IFFT(void* buffer);
+
+	/**
+	* Reserves memory for a buffer that can be used for inplace transformations with this plan.
+	* \return A pointer to a buffer of size ((N/2)+1)*2*sizeof(fftwf_complex).
+	* \warning The returned buffer must be freed with the freeBuffer method of this class.
+	*/
+	void* getBuffer();
+
+	/**
+	* Frees one of the buffers reserved with the getRealOnlyBuffer(), getComplexOnlyBuffer() or getInplaceBuffer() method.
+	* \param buffer A pointer to the buufer taht must be freed.
+	*/
+	void freeBuffer(void* buffer);
+};
+
+AUD_NAMESPACE_END