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Diffstat (limited to 'extern/audaspace/include/fx/FFTConvolver.h')
| -rw-r--r-- | extern/audaspace/include/fx/FFTConvolver.h | 196 |
1 files changed, 0 insertions, 196 deletions
diff --git a/extern/audaspace/include/fx/FFTConvolver.h b/extern/audaspace/include/fx/FFTConvolver.h deleted file mode 100644 index 62ce1cbf5ad..00000000000 --- a/extern/audaspace/include/fx/FFTConvolver.h +++ /dev/null @@ -1,196 +0,0 @@ -/******************************************************************************* -* 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 FFTConvolver.h -* @ingroup fx -* The FFTConvolver class. -*/ - -#include "IReader.h" -#include "ISound.h" -#include "util/FFTPlan.h" - -#include <memory> -#include <vector> - -AUD_NAMESPACE_BEGIN -/** -* This class allows to easily convolve a sound using the Fourier transform. -*/ -class AUD_API FFTConvolver -{ -private: - /** - * A shared pointer to an FFT plan. - */ - std::shared_ptr<FFTPlan> m_plan; - - /** - * The FFT size, must be at least M+L-1. - */ - int m_N; - - /** - * The length of the impulse response. - */ - int m_M; - - /** - * The max length of the input slices. - */ - int m_L; - - /** - * The real length of the internal buffer in fftwf_complex elements. - */ - int m_realBufLen; - - /** - * The internal buffer for the FFTS. - */ - std::complex<sample_t>* m_inBuffer; - - /** - * A shift buffer for the FDL method - */ - sample_t* m_shiftBuffer; - - /** - * A buffer to store the extra data obtained after each partial convolution. - */ - float* m_tail; - - /** - * The provided impulse response. - */ - std::shared_ptr<std::vector<std::complex<sample_t>>> m_irBuffer; - - /** - * If the tail is being read, this marks the current position. - */ - int m_tailPos; - - // delete copy constructor and operator= - FFTConvolver(const FFTConvolver&) = delete; - FFTConvolver& operator=(const FFTConvolver&) = delete; - -public: - /** - * Creates a new FFTConvolver. - * \param ir A shared pointer to a vector with the impulse response data in the frequency domain (see ImpulseResponse class for an easy way to obtain it). - * \param plan A shared pointer to and FFT plan. - */ - FFTConvolver(std::shared_ptr<std::vector<std::complex<sample_t>>> ir, std::shared_ptr<FFTPlan> plan); - virtual ~FFTConvolver(); - - /** - * Convolves the data that is provided with the inpulse response. - * \param[in] inBuffer A buffer with the input data to be convolved. - * \param[in] outBuffer A pointer to the buffer in which the convolution result will be written. - * \param[in,out] length The number of samples to be convolved (the length of both the inBuffer and the outBuffer). - * The convolution output should be larger than the input, but since this class uses the overlap - * add method, the extra length will be saved internally. - * It must be equal or lower than N/2 (N=size of the FFTPlan) or the call will fail, setting this variable to 0 since no data would be - * written in the outBuffer. - */ - void getNext(const sample_t* inBuffer, sample_t* outBuffer, int& length); - - /** - * Convolves the data that is provided with the inpulse response. - * \param[in] inBuffer A buffer with the input data to be convolved. - * \param[in] outBuffer A pointer to the buffer in which the convolution result will be written. - * \param[in,out] length The number of samples to be convolved (the length of both the inBuffer and the outBuffer). - * The convolution output should be larger than the input, but since this class uses the overlap - * add method, the extra length will be saved internally. - * It must be equal or lower than N/2 (N=size of the FFTPlan) or the call will fail, setting this variable to 0 since no data would be - * written in the outBuffer. - * \param[in] transformedData A pointer to a buffer in which the Fourier transform of the input will be written. - */ - void getNext(const sample_t* inBuffer, sample_t* outBuffer, int& length, fftwf_complex* transformedData); - - /** - * Convolves the data that is provided with the inpulse response. - * \param[in] inBuffer A buffer with the input data to be convolved. Its length must be N/2 + 1 - * \param[in] outBuffer A pointer to the buffer in which the convolution result will be written. - * \param[in,out] length The number of samples to be convolved and the length of the outBuffer. - * The convolution output should be larger than the input, but since this class uses the overlap - * add method, the extra length will be saved internally. - * It must be equal or lower than N/2 (N=size of the FFTPlan) or the call will fail and set the value of length to 0 since no data would be - * written in the outBuffer. - */ - void getNext(const fftwf_complex* inBuffer, sample_t* outBuffer, int& length); - - /** - * Gets the internally stored extra data which is result of the convolution. - * \param[in,out] length The count of samples that should be read. Shall - * contain the real count of samples after reading, in case - * there were only fewer samples available. - * A smaller value also indicates the end of the data. - * \param[out] eos End of stream, whether the end is reached or not. - * \param[in] buffer The pointer to the buffer to read into. - */ - void getTail(int& length, bool& eos, sample_t* buffer); - - /** - * Resets the internally stored data so a new convolution can be started. - */ - void clear(); - - /** - * Calculates the Inverse Fast Fourier Transform of the input array. - * \param[in] inBuffer A buffer with the input data to be transformed. Its length must be N/2 + 1 - * \param[in] outBuffer A pointer to the buffer in which the transform result will be written. - * \param[in,out] length The number of samples to be transformed and the length of the outBuffer. - * It must be equal or lower than N, but tipically N/2 should be used (N=size of the FFTPlan) or the call will fail and the value - * of length will be setted to 0, since no data would be written in the outBuffer. - */ - void IFFT_FDL(const fftwf_complex* inBuffer, sample_t* outBuffer, int& length); - - /** - * Multiplicates a frequency domain input by the impulse response and accumulates the result to a buffer. - * \param[in] inBuffer A buffer of complex numbers, samples in the frequency domain, that will be multiplied by the impulse response. Its length must be N/2 + 1 - * \param[in] accBuffer A pointer to the buffer into which the result of the multiplication will be summed. Its length must be N/2 + 1 - */ - void getNextFDL(const std::complex<sample_t>* inBuffer, std::complex<sample_t>* accBuffer); - - /** - * Transforms an input array of real data to the frequency domain and multiplies it by the impulse response. The result is accumulated to a buffer. - * \param[in] inBuffer A buffer of real numbers, samples in the time domain, that will be multiplied by the impulse response. - * \param[in] accBuffer A pointer to the buffer into which the result of the multiplication will be summed. Its length must be N/2 + 1. - * \param[in,out] length The number of samples to be transformed and the length of the inBuffer. - * It must be equal or lower than N/2 (N=size of the FFTPlan) or the call will fail and the value - * of length will be setted to 0, since no data would be written in the outBuffer. - * \param[in] transformedData A pointer to a buffer in which the Fourier transform of the input will be written. - */ - void getNextFDL(const sample_t* inBuffer, std::complex<sample_t>* accBuffer, int& length, fftwf_complex* transformedData); - - /** - * Changes the impulse response and resets the FFTConvolver. - * \param ir A shared pointer to a vector with the data of the impulse response in the frequency domain. - */ - void setImpulseResponse(std::shared_ptr<std::vector<std::complex<sample_t>>> ir); - - /** - * Retrieves the current impulse response being used. - * \return The current impulse response. - */ - std::shared_ptr<std::vector<std::complex<sample_t>>> getImpulseResponse(); -}; - -AUD_NAMESPACE_END |