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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_FFT_INTERNAL_H
  20. #define AVCODEC_FFT_INTERNAL_H
  21.  
  22. #if CONFIG_FFT_FLOAT
  23.  
  24. #define FIX15(v) (v)
  25. #define sqrthalf (float)M_SQRT1_2
  26.  
  27. #define BF(x, y, a, b) do {                     \
  28.         x = a - b;                              \
  29.         y = a + b;                              \
  30.     } while (0)
  31.  
  32. #define CMUL(dre, dim, are, aim, bre, bim) do { \
  33.         (dre) = (are) * (bre) - (aim) * (bim);  \
  34.         (dim) = (are) * (bim) + (aim) * (bre);  \
  35.     } while (0)
  36.  
  37. #else
  38.  
  39. #define SCALE_FLOAT(a, bits) lrint((a) * (double)(1 << (bits)))
  40.  
  41. #if CONFIG_FFT_FIXED_32
  42.  
  43. #define CMUL(dre, dim, are, aim, bre, bim) do {             \
  44.         int64_t accu;                                     \
  45.         (accu)  = (int64_t)(bre) * (are);                 \
  46.         (accu) -= (int64_t)(bim) * (aim);                 \
  47.         (dre)   = (int)(((accu) + 0x40000000) >> 31);       \
  48.         (accu)  = (int64_t)(bre) * (aim);                 \
  49.         (accu) += (int64_t)(bim) * (are);                 \
  50.         (dim)   = (int)(((accu) + 0x40000000) >> 31);       \
  51.     } while (0)
  52.  
  53. #define FIX15(a) av_clip(SCALE_FLOAT(a, 31), -2147483647, 2147483647)
  54.  
  55. #else /* CONFIG_FFT_FIXED_32 */
  56.  
  57. #include "fft.h"
  58. #include "mathops.h"
  59.  
  60. void ff_mdct_calcw_c(FFTContext *s, FFTDouble *output, const FFTSample *input);
  61.  
  62. #define FIX15(a) av_clip(SCALE_FLOAT(a, 15), -32767, 32767)
  63.  
  64. #define sqrthalf ((int16_t)((1<<15)*M_SQRT1_2))
  65.  
  66. #define BF(x, y, a, b) do {                     \
  67.         x = (a - b) >> 1;                       \
  68.         y = (a + b) >> 1;                       \
  69.     } while (0)
  70.  
  71. #define CMULS(dre, dim, are, aim, bre, bim, sh) do {            \
  72.         (dre) = (MUL16(are, bre) - MUL16(aim, bim)) >> sh;      \
  73.         (dim) = (MUL16(are, bim) + MUL16(aim, bre)) >> sh;      \
  74.     } while (0)
  75.  
  76. #define CMUL(dre, dim, are, aim, bre, bim)      \
  77.     CMULS(dre, dim, are, aim, bre, bim, 15)
  78.  
  79. #define CMULL(dre, dim, are, aim, bre, bim)     \
  80.     CMULS(dre, dim, are, aim, bre, bim, 0)
  81.  
  82. #endif /* CONFIG_FFT_FIXED_32 */
  83.  
  84. #endif /* CONFIG_FFT_FLOAT */
  85.  
  86. #define ff_imdct_calc_c FFT_NAME(ff_imdct_calc_c)
  87. #define ff_imdct_half_c FFT_NAME(ff_imdct_half_c)
  88. #define ff_mdct_calc_c  FFT_NAME(ff_mdct_calc_c)
  89.  
  90. void ff_imdct_calc_c(FFTContext *s, FFTSample *output, const FFTSample *input);
  91. void ff_imdct_half_c(FFTContext *s, FFTSample *output, const FFTSample *input);
  92. void ff_mdct_calc_c(FFTContext *s, FFTSample *output, const FFTSample *input);
  93.  
  94. #endif /* AVCODEC_FFT_INTERNAL_H */
  95.