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avfft.h (4081B)

      1 /*
      2 * This file is part of FFmpeg.
      3 *
      4 * FFmpeg is free software; you can redistribute it and/or
      5 * modify it under the terms of the GNU Lesser General Public
      6 * License as published by the Free Software Foundation; either
      7 * version 2.1 of the License, or (at your option) any later version.
      8 *
      9 * FFmpeg is distributed in the hope that it will be useful,
     10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
     11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     12 * Lesser General Public License for more details.
     13 *
     14 * You should have received a copy of the GNU Lesser General Public
     15 * License along with FFmpeg; if not, write to the Free Software
     16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
     17 */
     18 
     19 #ifndef AVCODEC_AVFFT_H
     20 #define AVCODEC_AVFFT_H
     21 
     22 #include "libavutil/attributes.h"
     23 #include "version_major.h"
     24 #if FF_API_AVFFT
     25 
     26 /**
     27 * @file
     28 * @ingroup lavc_fft
     29 * FFT functions
     30 */
     31 
     32 /**
     33 * @defgroup lavc_fft FFT functions
     34 * @ingroup lavc_misc
     35 *
     36 * @{
     37 */
     38 
     39 typedef float FFTSample;
     40 
     41 typedef struct FFTComplex {
     42    FFTSample re, im;
     43 } FFTComplex;
     44 
     45 typedef struct FFTContext FFTContext;
     46 
     47 /**
     48 * Set up a complex FFT.
     49 * @param nbits           log2 of the length of the input array
     50 * @param inverse         if 0 perform the forward transform, if 1 perform the inverse
     51 * @deprecated use av_tx_init from libavutil/tx.h with a type of AV_TX_FLOAT_FFT
     52 */
     53 attribute_deprecated
     54 FFTContext *av_fft_init(int nbits, int inverse);
     55 
     56 /**
     57 * Do the permutation needed BEFORE calling ff_fft_calc().
     58 * @deprecated without replacement
     59 */
     60 attribute_deprecated
     61 void av_fft_permute(FFTContext *s, FFTComplex *z);
     62 
     63 /**
     64 * Do a complex FFT with the parameters defined in av_fft_init(). The
     65 * input data must be permuted before. No 1.0/sqrt(n) normalization is done.
     66 * @deprecated use the av_tx_fn value returned by av_tx_init, which also does permutation
     67 */
     68 attribute_deprecated
     69 void av_fft_calc(FFTContext *s, FFTComplex *z);
     70 
     71 attribute_deprecated
     72 void av_fft_end(FFTContext *s);
     73 
     74 /**
     75 * @deprecated use av_tx_init from libavutil/tx.h with a type of AV_TX_FLOAT_MDCT,
     76 * with a flag of AV_TX_FULL_IMDCT for a replacement to av_imdct_calc.
     77 */
     78 attribute_deprecated
     79 FFTContext *av_mdct_init(int nbits, int inverse, double scale);
     80 attribute_deprecated
     81 void av_imdct_calc(FFTContext *s, FFTSample *output, const FFTSample *input);
     82 attribute_deprecated
     83 void av_imdct_half(FFTContext *s, FFTSample *output, const FFTSample *input);
     84 attribute_deprecated
     85 void av_mdct_calc(FFTContext *s, FFTSample *output, const FFTSample *input);
     86 attribute_deprecated
     87 void av_mdct_end(FFTContext *s);
     88 
     89 /* Real Discrete Fourier Transform */
     90 
     91 enum RDFTransformType {
     92    DFT_R2C,
     93    IDFT_C2R,
     94    IDFT_R2C,
     95    DFT_C2R,
     96 };
     97 
     98 typedef struct RDFTContext RDFTContext;
     99 
    100 /**
    101 * Set up a real FFT.
    102 * @param nbits           log2 of the length of the input array
    103 * @param trans           the type of transform
    104 *
    105 * @deprecated use av_tx_init from libavutil/tx.h with a type of AV_TX_FLOAT_RDFT
    106 */
    107 attribute_deprecated
    108 RDFTContext *av_rdft_init(int nbits, enum RDFTransformType trans);
    109 attribute_deprecated
    110 void av_rdft_calc(RDFTContext *s, FFTSample *data);
    111 attribute_deprecated
    112 void av_rdft_end(RDFTContext *s);
    113 
    114 /* Discrete Cosine Transform */
    115 
    116 typedef struct DCTContext DCTContext;
    117 
    118 enum DCTTransformType {
    119    DCT_II = 0,
    120    DCT_III,
    121    DCT_I,
    122    DST_I,
    123 };
    124 
    125 /**
    126 * Set up DCT.
    127 *
    128 * @param nbits           size of the input array:
    129 *                        (1 << nbits)     for DCT-II, DCT-III and DST-I
    130 *                        (1 << nbits) + 1 for DCT-I
    131 * @param type            the type of transform
    132 *
    133 * @note the first element of the input of DST-I is ignored
    134 *
    135 * @deprecated use av_tx_init from libavutil/tx.h with an appropriate type of AV_TX_FLOAT_DCT
    136 */
    137 attribute_deprecated
    138 DCTContext *av_dct_init(int nbits, enum DCTTransformType type);
    139 attribute_deprecated
    140 void av_dct_calc(DCTContext *s, FFTSample *data);
    141 attribute_deprecated
    142 void av_dct_end (DCTContext *s);
    143 
    144 /**
    145 * @}
    146 */
    147 
    148 #endif /* FF_API_AVFFT */
    149 #endif /* AVCODEC_AVFFT_H */