/* * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef AVCODEC_AVFFT_H#define AVCODEC_AVFFT_H #include "libavutil/attributes.h"#include "version_major.h"#if FF_API_AVFFT /** * @file * @ingroup lavc_fft * FFT functions */ /** * @defgroup lavc_fft FFT functions * @ingroup lavc_misc * * @{ */ typedef float FFTSample; typedef struct FFTComplex {    FFTSample re, im;} FFTComplex; typedef struct FFTContext FFTContext; /** * Set up a complex FFT. * @param nbits           log2 of the length of the input array * @param inverse         if 0 perform the forward transform, if 1 perform the inverse * @deprecated use av_tx_init from libavutil/tx.h with a type of AV_TX_FLOAT_FFT */attribute_deprecatedFFTContext *av_fft_init(int nbits, int inverse); /** * Do the permutation needed BEFORE calling ff_fft_calc(). * @deprecated without replacement */attribute_deprecatedvoid av_fft_permute(FFTContext *s, FFTComplex *z); /** * Do a complex FFT with the parameters defined in av_fft_init(). The * input data must be permuted before. No 1.0/sqrt(n) normalization is done. * @deprecated use the av_tx_fn value returned by av_tx_init, which also does permutation */attribute_deprecatedvoid av_fft_calc(FFTContext *s, FFTComplex *z); attribute_deprecatedvoid av_fft_end(FFTContext *s); /** * @deprecated use av_tx_init from libavutil/tx.h with a type of AV_TX_FLOAT_MDCT, * with a flag of AV_TX_FULL_IMDCT for a replacement to av_imdct_calc. */attribute_deprecatedFFTContext *av_mdct_init(int nbits, int inverse, double scale);attribute_deprecatedvoid av_imdct_calc(FFTContext *s, FFTSample *output, const FFTSample *input);attribute_deprecatedvoid av_imdct_half(FFTContext *s, FFTSample *output, const FFTSample *input);attribute_deprecatedvoid av_mdct_calc(FFTContext *s, FFTSample *output, const FFTSample *input);attribute_deprecatedvoid av_mdct_end(FFTContext *s); /* Real Discrete Fourier Transform */ enum RDFTransformType {    DFT_R2C,    IDFT_C2R,    IDFT_R2C,    DFT_C2R,}; typedef struct RDFTContext RDFTContext; /** * Set up a real FFT. * @param nbits           log2 of the length of the input array * @param trans           the type of transform * * @deprecated use av_tx_init from libavutil/tx.h with a type of AV_TX_FLOAT_RDFT */attribute_deprecatedRDFTContext *av_rdft_init(int nbits, enum RDFTransformType trans);attribute_deprecatedvoid av_rdft_calc(RDFTContext *s, FFTSample *data);attribute_deprecatedvoid av_rdft_end(RDFTContext *s); /* Discrete Cosine Transform */ typedef struct DCTContext DCTContext; enum DCTTransformType {    DCT_II = 0,    DCT_III,    DCT_I,    DST_I,}; /** * Set up DCT. * * @param nbits           size of the input array: *                        (1 << nbits)     for DCT-II, DCT-III and DST-I *                        (1 << nbits) + 1 for DCT-I * @param type            the type of transform * * @note the first element of the input of DST-I is ignored * * @deprecated use av_tx_init from libavutil/tx.h with an appropriate type of AV_TX_FLOAT_DCT */attribute_deprecatedDCTContext *av_dct_init(int nbits, enum DCTTransformType type);attribute_deprecatedvoid av_dct_calc(DCTContext *s, FFTSample *data);attribute_deprecatedvoid av_dct_end (DCTContext *s); /** * @} */ #endif /* FF_API_AVFFT */#endif /* AVCODEC_AVFFT_H */