1 /* 2 * This file is part of Libav. 3 * 4 * Libav 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 * Libav 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 Libav; 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 #include "fft.h" 40 #include "mathops.h" 41 42 void ff_mdct_calcw_c(FFTContext *s, FFTDouble *output, const FFTSample *input); 43 44 #define SCALE_FLOAT(a, bits) lrint((a) * (double)(1 << (bits))) 45 #define FIX15(a) av_clip(SCALE_FLOAT(a, 15), -32767, 32767) 46 47 #define sqrthalf ((int16_t)((1<<15)*M_SQRT1_2)) 48 49 #define BF(x, y, a, b) do { \ 50 x = (a - b) >> 1; \ 51 y = (a + b) >> 1; \ 52 } while (0) 53 54 #define CMULS(dre, dim, are, aim, bre, bim, sh) do { \ 55 (dre) = (MUL16(are, bre) - MUL16(aim, bim)) >> sh; \ 56 (dim) = (MUL16(are, bim) + MUL16(aim, bre)) >> sh; \ 57 } while (0) 58 59 #define CMUL(dre, dim, are, aim, bre, bim) \ 60 CMULS(dre, dim, are, aim, bre, bim, 15) 61 62 #define CMULL(dre, dim, are, aim, bre, bim) \ 63 CMULS(dre, dim, are, aim, bre, bim, 0) 64 65 #endif /* FFT_FLOAT */ 66 67 #define ff_imdct_calc_c FFT_NAME(ff_imdct_calc_c) 68 #define ff_imdct_half_c FFT_NAME(ff_imdct_half_c) 69 #define ff_mdct_calc_c FFT_NAME(ff_mdct_calc_c) 70 71 void ff_imdct_calc_c(FFTContext *s, FFTSample *output, const FFTSample *input); 72 void ff_imdct_half_c(FFTContext *s, FFTSample *output, const FFTSample *input); 73 void ff_mdct_calc_c(FFTContext *s, FFTSample *output, const FFTSample *input); 74 75 #endif /* AVCODEC_FFT_INTERNAL_H */ 76