2 * This file is part of FFmpeg.
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.
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.
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
19 #ifndef AVCODEC_FFT_INTERNAL_H
20 #define AVCODEC_FFT_INTERNAL_H
25 #define sqrthalf (float)M_SQRT1_2
27 #define BF(x, y, a, b) do { \
32 #define CMUL(dre, dim, are, aim, bre, bim) do { \
33 (dre) = (are) * (bre) - (aim) * (bim); \
34 (dim) = (are) * (bim) + (aim) * (bre); \
39 #define SCALE_FLOAT(a, bits) lrint((a) * (double)(1 << (bits)))
43 #define CMUL(dre, dim, are, aim, bre, bim) do { \
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); \
53 #define FIX15(a) av_clip(SCALE_FLOAT(a, 31), -2147483647, 2147483647)
55 #else /* FFT_FIXED_32 */
60 void ff_mdct_calcw_c(FFTContext
*s
, FFTDouble
*output
, const FFTSample
*input
);
62 #define FIX15(a) av_clip(SCALE_FLOAT(a, 15), -32767, 32767)
64 #define sqrthalf ((int16_t)((1<<15)*M_SQRT1_2))
66 #define BF(x, y, a, b) do { \
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; \
76 #define CMUL(dre, dim, are, aim, bre, bim) \
77 CMULS(dre, dim, are, aim, bre, bim, 15)
79 #define CMULL(dre, dim, are, aim, bre, bim) \
80 CMULS(dre, dim, are, aim, bre, bim, 0)
82 #endif /* FFT_FIXED_32 */
84 #endif /* FFT_FLOAT */
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)
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
);
94 #endif /* AVCODEC_FFT_INTERNAL_H */