diff options
Diffstat (limited to 'libavcodec/fft-internal.h')
| -rw-r--r-- | libavcodec/fft-internal.h | 29 |
1 files changed, 24 insertions, 5 deletions
diff --git a/libavcodec/fft-internal.h b/libavcodec/fft-internal.h index c312625837..065eeccef1 100644 --- a/libavcodec/fft-internal.h +++ b/libavcodec/fft-internal.h @@ -1,18 +1,18 @@ /* - * This file is part of Libav. + * This file is part of FFmpeg. * - * Libav is free software; you can redistribute it and/or + * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * - * Libav is distributed in the hope that it will be useful, + * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public - * License along with Libav; if not, write to the Free Software + * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ @@ -36,12 +36,29 @@ #else +#define SCALE_FLOAT(a, bits) lrint((a) * (double)(1 << (bits))) + +#if CONFIG_FFT_FIXED_32 + +#define CMUL(dre, dim, are, aim, bre, bim) do { \ + int64_t accu; \ + (accu) = (int64_t)(bre) * (are); \ + (accu) -= (int64_t)(bim) * (aim); \ + (dre) = (int)(((accu) + 0x40000000) >> 31); \ + (accu) = (int64_t)(bre) * (aim); \ + (accu) += (int64_t)(bim) * (are); \ + (dim) = (int)(((accu) + 0x40000000) >> 31); \ + } while (0) + +#define FIX15(a) av_clip(SCALE_FLOAT(a, 31), -2147483647, 2147483647) + +#else /* CONFIG_FFT_FIXED_32 */ + #include "fft.h" #include "mathops.h" void ff_mdct_calcw_c(FFTContext *s, FFTDouble *output, const FFTSample *input); -#define SCALE_FLOAT(a, bits) lrint((a) * (double)(1 << (bits))) #define FIX15(a) av_clip(SCALE_FLOAT(a, 15), -32767, 32767) #define sqrthalf ((int16_t)((1<<15)*M_SQRT1_2)) @@ -62,6 +79,8 @@ void ff_mdct_calcw_c(FFTContext *s, FFTDouble *output, const FFTSample *input); #define CMULL(dre, dim, are, aim, bre, bim) \ CMULS(dre, dim, are, aim, bre, bim, 0) +#endif /* CONFIG_FFT_FIXED_32 */ + #endif /* CONFIG_FFT_FLOAT */ #define ff_imdct_calc_c FFT_NAME(ff_imdct_calc_c) |