ffmpeg/libavcodec/fft-internal.h

   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 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 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 /* 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 /* FFT_FIXED_32 */
  83
  84 #endif /* 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 */