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 */ 95