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libavcodec/x86/fft.c

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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 #include "libavcodec/dsputil.h"
00020 #include "fft.h"
00021 
00022 av_cold void ff_fft_init_mmx(FFTContext *s)
00023 {
00024 #if HAVE_YASM
00025     int has_vectors = mm_support();
00026     if (has_vectors & FF_MM_SSE && HAVE_SSE) {
00027         /* SSE for P3/P4/K8 */
00028         s->imdct_calc  = ff_imdct_calc_sse;
00029         s->imdct_half  = ff_imdct_half_sse;
00030         s->fft_permute = ff_fft_permute_sse;
00031         s->fft_calc    = ff_fft_calc_sse;
00032     } else if (has_vectors & FF_MM_3DNOWEXT && HAVE_AMD3DNOWEXT) {
00033         /* 3DNowEx for K7 */
00034         s->imdct_calc = ff_imdct_calc_3dn2;
00035         s->imdct_half = ff_imdct_half_3dn2;
00036         s->fft_calc   = ff_fft_calc_3dn2;
00037     } else if (has_vectors & FF_MM_3DNOW && HAVE_AMD3DNOW) {
00038         /* 3DNow! for K6-2/3 */
00039         s->imdct_calc = ff_imdct_calc_3dn;
00040         s->imdct_half = ff_imdct_half_3dn;
00041         s->fft_calc   = ff_fft_calc_3dn;
00042     }
00043 #endif
00044 }

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