#ifndef WH_FFT_INTERNAL_H_2045a144_
#define WH_FFT_INTERNAL_H_2045a144_

/*
 * This file was stolen from ffmpeg and modified for usability here.
 *  The original does not have a "copyright by" line.
 *
 * This version is a derivative work of that version.  It is not free
 *  software; it is licensed under the GNU Lesser General Public
 *  License version 2.1, which places nontrivial restrictions on what
 *  may be done with it.  (I'm not terribly happy about that, but for
 *  my purposes accepting LGPL-infected code is a lower price than
 *  reimplementing it all myself.)
 *
 * The LGPL v2.1 as distributed with ffmpeg is in the accompanying file
 *  `LGPL-v2.1'.
 */

#include "fft.h"
#include "config.h"

#if CONFIG_FFT_FLOAT

#define FIX15(v) (v)
#define sqrthalf (float)M_SQRT1_2

#define BF(x, y, a, b) do {                     \
        x = a - b;                              \
        y = a + b;                              \
    } while (0)

#define CMUL(dre, dim, are, aim, bre, bim) do { \
        (dre) = (are) * (bre) - (aim) * (bim);  \
        (dim) = (are) * (bim) + (aim) * (bre);  \
    } while (0)

#else

#include "libavutil/intmath.h"
#include "mathops.h"

void ff_mdct_calcw_c(FFTContext *s, FFTDouble *output, const FFTSample *input);

#define SCALE_FLOAT(a, bits) lrint((a) * (double)(1 << (bits)))
#define FIX15(a) av_clip(SCALE_FLOAT(a, 15), -32767, 32767)

#define sqrthalf ((int16_t)((1<<15)*M_SQRT1_2))

#define BF(x, y, a, b) do {                     \
        x = (a - b) >> 1;                       \
        y = (a + b) >> 1;                       \
    } while (0)

#define CMULS(dre, dim, are, aim, bre, bim, sh) do {            \
        (dre) = (MUL16(are, bre) - MUL16(aim, bim)) >> sh;      \
        (dim) = (MUL16(are, bim) + MUL16(aim, bre)) >> sh;      \
    } while (0)

#define CMUL(dre, dim, are, aim, bre, bim)      \
    CMULS(dre, dim, are, aim, bre, bim, 15)

#define CMULL(dre, dim, are, aim, bre, bim)     \
    CMULS(dre, dim, are, aim, bre, bim, 0)

#endif /* CONFIG_FFT_FLOAT */

#define ff_imdct_calc_c FFT_NAME(ff_imdct_calc_c)
#define ff_imdct_half_c FFT_NAME(ff_imdct_half_c)
#define ff_mdct_calc_c  FFT_NAME(ff_mdct_calc_c)

void ff_imdct_calc_c(FFTContext *s, FFTSample *output, const FFTSample *input);
void ff_imdct_half_c(FFTContext *s, FFTSample *output, const FFTSample *input);
void ff_mdct_calc_c(FFTContext *s, FFTSample *output, const FFTSample *input);

#endif