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ffmpeg / libavcodec / x86 / fft.c @ 2912e87a

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/*
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "libavutil/cpu.h"
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#include "libavcodec/dsputil.h"
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#include "fft.h"
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av_cold void ff_fft_init_mmx(FFTContext *s)
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{
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#if HAVE_YASM
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    int has_vectors = av_get_cpu_flags();
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    if (has_vectors & AV_CPU_FLAG_SSE && HAVE_SSE) {
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        /* SSE for P3/P4/K8 */
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        s->imdct_calc  = ff_imdct_calc_sse;
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        s->imdct_half  = ff_imdct_half_sse;
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        s->fft_permute = ff_fft_permute_sse;
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        s->fft_calc    = ff_fft_calc_sse;
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        s->fft_permutation = FF_FFT_PERM_SWAP_LSBS;
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    } else if (has_vectors & AV_CPU_FLAG_3DNOWEXT && HAVE_AMD3DNOWEXT) {
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        /* 3DNowEx for K7 */
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        s->imdct_calc = ff_imdct_calc_3dn2;
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        s->imdct_half = ff_imdct_half_3dn2;
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        s->fft_calc   = ff_fft_calc_3dn2;
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    } else if (has_vectors & AV_CPU_FLAG_3DNOW && HAVE_AMD3DNOW) {
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        /* 3DNow! for K6-2/3 */
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        s->imdct_calc = ff_imdct_calc_3dn;
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        s->imdct_half = ff_imdct_half_3dn;
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        s->fft_calc   = ff_fft_calc_3dn;
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    }
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#endif
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}
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#if CONFIG_DCT
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av_cold void ff_dct_init_mmx(DCTContext *s)
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{
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    int has_vectors = av_get_cpu_flags();
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    if (has_vectors & AV_CPU_FLAG_SSE && HAVE_SSE)
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        s->dct32 = ff_dct32_float_sse;
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}
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#endif
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