00001 /* 00002 * This file is part of FFmpeg. 00003 * 00004 * FFmpeg is free software; you can redistribute it and/or 00005 * modify it under the terms of the GNU Lesser General Public 00006 * License as published by the Free Software Foundation; either 00007 * version 2.1 of the License, or (at your option) any later version. 00008 * 00009 * FFmpeg is distributed in the hope that it will be useful, 00010 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00012 * Lesser General Public License for more details. 00013 * 00014 * You should have received a copy of the GNU Lesser General Public 00015 * License along with FFmpeg; if not, write to the Free Software 00016 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00017 */ 00018 00019 #ifndef AVCODEC_FFT_INTERNAL_H 00020 #define AVCODEC_FFT_INTERNAL_H 00021 00022 #if CONFIG_FFT_FLOAT 00023 00024 #define FIX15(v) (v) 00025 #define sqrthalf (float)M_SQRT1_2 00026 00027 #define BF(x, y, a, b) do { \ 00028 x = a - b; \ 00029 y = a + b; \ 00030 } while (0) 00031 00032 #define CMUL(dre, dim, are, aim, bre, bim) do { \ 00033 (dre) = (are) * (bre) - (aim) * (bim); \ 00034 (dim) = (are) * (bim) + (aim) * (bre); \ 00035 } while (0) 00036 00037 #else 00038 00039 #include "libavutil/intmath.h" 00040 #include "mathops.h" 00041 00042 void ff_mdct_calcw_c(FFTContext *s, FFTDouble *output, const FFTSample *input); 00043 00044 #define SCALE_FLOAT(a, bits) lrint((a) * (double)(1 << (bits))) 00045 #define FIX15(a) av_clip(SCALE_FLOAT(a, 15), -32767, 32767) 00046 00047 #define sqrthalf ((int16_t)((1<<15)*M_SQRT1_2)) 00048 00049 #define BF(x, y, a, b) do { \ 00050 x = (a - b) >> 1; \ 00051 y = (a + b) >> 1; \ 00052 } while (0) 00053 00054 #define CMULS(dre, dim, are, aim, bre, bim, sh) do { \ 00055 (dre) = (MUL16(are, bre) - MUL16(aim, bim)) >> sh; \ 00056 (dim) = (MUL16(are, bim) + MUL16(aim, bre)) >> sh; \ 00057 } while (0) 00058 00059 #define CMUL(dre, dim, are, aim, bre, bim) \ 00060 CMULS(dre, dim, are, aim, bre, bim, 15) 00061 00062 #define CMULL(dre, dim, are, aim, bre, bim) \ 00063 CMULS(dre, dim, are, aim, bre, bim, 0) 00064 00065 #endif /* CONFIG_FFT_FLOAT */ 00066 00067 #define ff_imdct_calc_c FFT_NAME(ff_imdct_calc_c) 00068 #define ff_imdct_half_c FFT_NAME(ff_imdct_half_c) 00069 #define ff_mdct_calc_c FFT_NAME(ff_mdct_calc_c) 00070 00071 void ff_imdct_calc_c(FFTContext *s, FFTSample *output, const FFTSample *input); 00072 void ff_imdct_half_c(FFTContext *s, FFTSample *output, const FFTSample *input); 00073 void ff_mdct_calc_c(FFTContext *s, FFTSample *output, const FFTSample *input); 00074 00075 #endif /* AVCODEC_FFT_INTERNAL_H */