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  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_IMDCT15_H
  20. #define AVCODEC_IMDCT15_H
  21.  
  22. #include <stddef.h>
  23.  
  24. #include "avfft.h"
  25.  
  26. typedef struct IMDCT15Context {
  27.     int fft_n;
  28.     int len2;
  29.     int len4;
  30.  
  31.     FFTComplex *tmp;
  32.  
  33.     FFTComplex *twiddle_exptab;
  34.  
  35.     FFTComplex *exptab[6];
  36.  
  37.     /**
  38.      * Calculate the middle half of the iMDCT
  39.      */
  40.     void (*imdct_half)(struct IMDCT15Context *s, float *dst, const float *src,
  41.                        ptrdiff_t src_stride, float scale);
  42. } IMDCT15Context;
  43.  
  44. /**
  45.  * Init an iMDCT of the length 2 * 15 * (2^N)
  46.  */
  47. int ff_imdct15_init(IMDCT15Context **s, int N);
  48.  
  49. /**
  50.  * Free an iMDCT.
  51.  */
  52. void ff_imdct15_uninit(IMDCT15Context **s);
  53.  
  54.  
  55. void ff_imdct15_init_aarch64(IMDCT15Context *s);
  56.  
  57. #endif /* AVCODEC_IMDCT15_H */
  58.