/*

  * Copyright (c) 2017 Rostislav Pehlivanov <atomnuker@gmail.com>
  *

  * 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_MDCT15_H
 #define AVCODEC_MDCT15_H

 
 #include <stddef.h>
 

 #include "fft.h"

 typedef struct MDCT15Context {

     int fft_n;
     int len2;
     int len4;

     int inverse;

     int *pfa_prereindex;
     int *pfa_postreindex;
 
     FFTContext ptwo_fft;

     FFTComplex *tmp;
     FFTComplex *twiddle_exptab;
 

     DECLARE_ALIGNED(32, FFTComplex, exptab)[64];

     /* 15-point FFT */
     void (*fft15)(FFTComplex *out, FFTComplex *in, FFTComplex *exptab, ptrdiff_t stride);
 

     /* PFA postrotate and exptab */
     void (*postreindex)(FFTComplex *out, FFTComplex *in, FFTComplex *exp, int *lut, ptrdiff_t len8);
 

     /* Calculate a full 2N -> N MDCT */

     void (*mdct)(struct MDCT15Context *s, float *dst, const float *src, ptrdiff_t stride);
 

     /* Calculate the middle half of the iMDCT */

     void (*imdct_half)(struct MDCT15Context *s, float *dst, const float *src,

                        ptrdiff_t stride);

 } MDCT15Context;

 /* Init an (i)MDCT of the length 2 * 15 * (2^N) */

 int ff_mdct15_init(MDCT15Context **ps, int inverse, int N, double scale);
 void ff_mdct15_uninit(MDCT15Context **ps);

 void ff_mdct15_init_x86(MDCT15Context *s);
 

 #endif /* AVCODEC_MDCT15_H */