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avcodec.h
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avdct.h
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avfft.h
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d3d11va.h
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dirac.h
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dv_profile.h
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dxva2.h
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jni.h
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mediacodec.h
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qsv.h
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vaapi.h
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vda.h
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vdpau.h
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version.h
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videotoolbox.h
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vorbis_parser.h
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xvmc.h
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Editing: avfft.h
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/* * 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 /** * @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 */ FFTContext *av_fft_init(int nbits, int inverse); /** * Do the permutation needed BEFORE calling ff_fft_calc(). */ void 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. */ void av_fft_calc(FFTContext *s, FFTComplex *z); void av_fft_end(FFTContext *s); FFTContext *av_mdct_init(int nbits, int inverse, double scale); void av_imdct_calc(FFTContext *s, FFTSample *output, const FFTSample *input); void av_imdct_half(FFTContext *s, FFTSample *output, const FFTSample *input); void av_mdct_calc(FFTContext *s, FFTSample *output, const FFTSample *input); void 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 */ RDFTContext *av_rdft_init(int nbits, enum RDFTransformType trans); void av_rdft_calc(RDFTContext *s, FFTSample *data); void 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 */ DCTContext *av_dct_init(int nbits, enum DCTTransformType type); void av_dct_calc(DCTContext *s, FFTSample *data); void av_dct_end (DCTContext *s); /** * @} */ #endif /* AVCODEC_AVFFT_H */