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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 ImpulseResponse.h
+* @ingroup fx
+* The ImpulseResponse class.
+*/
+
+#include "util/StreamBuffer.h"
+#include "util/FFTPlan.h"
+#include "IReader.h"
+
+#include <memory>
+#include <vector>
+
+AUD_NAMESPACE_BEGIN
+
+/**
+* This class represents an impulse response that can be used in convolution.
+* When this class is instanced, the impulse response is divided in channels and those channels are divided in parts of N/2 samples (N being the size of the FFT plan used).
+* The main objetive of this class is to allow the reutilization of an impulse response in various sounds without having to process it more than one time.
+* \warning The size of the FFTPlan used to process the impulse response must be the same as the one used in the convolver classes.
+*/
+class AUD_API ImpulseResponse
+{
+private:
+	/**
+	* A tri-dimensional array (channels, parts, values) The impulse response is divided in channels and those channels are divided
+	* in parts of N/2 samples. Those parts are transformed to the frequency domain transform which generates uni-dimensional 
+	* arrays of fftwtf_complex data (complex numbers).
+	*/
+	std::vector<std::shared_ptr<std::vector<std::shared_ptr<std::vector<std::complex<sample_t>>>>>> m_processedIR;
+
+	/**
+	* The specification of the samples.
+	*/
+	Specs m_specs;
+
+	/**
+	* The length of the impulse response.
+	*/
+	int m_length;
+
+	// delete copy constructor and operator=
+	ImpulseResponse(const ImpulseResponse&) = delete;
+	ImpulseResponse& operator=(const ImpulseResponse&) = delete;
+
+public:
+	/**
+	* Creates a new ImpulseResponse object.
+	* The impulse response will be split and transformed to the frequency domain.
+	* \param impulseResponse The impulse response sound.
+	* \param plan A shared pointer to a FFT plan used to transform the impulse response.
+	*/
+	ImpulseResponse(std::shared_ptr<StreamBuffer> impulseResponse, std::shared_ptr<FFTPlan> plan);
+
+	/**
+	* Creates a new ImpulseResponse object. This overload instances its own FFTPlan with default size.
+	* The impulse response will be split and transformed to the frequency domain.
+	* \param impulseResponse The impulse response sound.
+	*/
+	ImpulseResponse(std::shared_ptr<StreamBuffer> impulseResponse);
+
+	/**
+	* Returns the specification of the impulse response.
+	* \return The specification of the impulse response.
+	*/
+	Specs getSpecs();
+
+	/**
+	* Retrieves the length of the impulse response.
+	* \return The length of the impulse response.
+	*/
+	int getLength();
+
+	/**
+	* Retrieves one channel of the impulse response.
+	* \param n The desired channel number (from 0 to channels-1).
+	* \return The desired channel of the impulse response.
+	*/
+	std::shared_ptr<std::vector<std::shared_ptr<std::vector<std::complex<sample_t>>>>> getChannel(int n);
+
+private:
+	/**
+	* Processes the impulse response sound for its use in the convovler classes.
+	* \param A shared pointer to a reader of the desired sound.
+	* \param plan A shared pointer to a FFT plan used to transform the impulse response.
+	*/
+	void processImpulseResponse(std::shared_ptr<IReader> reader, std::shared_ptr<FFTPlan> plan);
+};
+
+AUD_NAMESPACE_END