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 #include "config.h" 20 21 #include "libavutil/attributes.h" 22 #include "libavutil/cpu.h" 23 #include "libavutil/x86/cpu.h" 24 25 #include "fft.h" 26 ff_fft_init_x86(FFTContext * s)27av_cold void ff_fft_init_x86(FFTContext *s) 28 { 29 int cpu_flags = av_get_cpu_flags(); 30 31 if (s->nbits > 16) 32 return; 33 34 if (EXTERNAL_SSE(cpu_flags)) { 35 s->imdct_calc = ff_imdct_calc_sse; 36 s->imdct_half = ff_imdct_half_sse; 37 s->fft_permute = ff_fft_permute_sse; 38 s->fft_calc = ff_fft_calc_sse; 39 s->fft_permutation = FF_FFT_PERM_SWAP_LSBS; 40 } 41 42 if (EXTERNAL_AVX_FAST(cpu_flags) && s->nbits >= 5) { 43 s->imdct_half = ff_imdct_half_avx; 44 s->fft_calc = ff_fft_calc_avx; 45 s->fft_permutation = FF_FFT_PERM_AVX; 46 } 47 } 48