/*

  * 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_FFT_INTERNAL_H
 #define AVCODEC_FFT_INTERNAL_H
 

 #if 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
 

 #define SCALE_FLOAT(a, bits) lrint((a) * (double)(1 << (bits)))
 

 #if FFT_FIXED_32

 
 #define CMUL(dre, dim, are, aim, bre, bim) do {             \
         int64_t accu;                                     \
         (accu)  = (int64_t)(bre) * (are);                 \
         (accu) -= (int64_t)(bim) * (aim);                 \
         (dre)   = (int)(((accu) + 0x40000000) >> 31);       \
         (accu)  = (int64_t)(bre) * (aim);                 \
         (accu) += (int64_t)(bim) * (are);                 \
         (dim)   = (int)(((accu) + 0x40000000) >> 31);       \
     } while (0)
 
 #define FIX15(a) av_clip(SCALE_FLOAT(a, 31), -2147483647, 2147483647)
 

 #else /* FFT_FIXED_32 */

 #include "fft.h"

 #include "mathops.h"
 

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

 #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 /* FFT_FIXED_32 */

 #endif /* 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 /* AVCODEC_FFT_INTERNAL_H */