fft_init_arm.c

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/*
 * Copyright (c) 2009 Mans Rullgard <mans@mansr.com>
 *
 * This file is part of FFmpeg.
 *
 * 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.
 *
 * 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 FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */
 
#include "libavutil/attributes.h"
#include "libavutil/cpu.h"
#include "libavutil/arm/cpu.h"
 
#include "libavcodec/fft.h"
 
void ff_fft_calc_vfp(FFTContext *s, FFTComplex *z);
 
void ff_fft_permute_neon(FFTContext *s, FFTComplex *z);
void ff_fft_calc_neon(FFTContext *s, FFTComplex *z);
 
void ff_imdct_half_vfp(FFTContext *s, FFTSample *output, const FFTSample *input);
 
void ff_imdct_calc_neon(FFTContext *s, FFTSample *output, const FFTSample *input);
void ff_imdct_half_neon(FFTContext *s, FFTSample *output, const FFTSample *input);
void ff_mdct_calc_neon(FFTContext *s, FFTSample *output, const FFTSample *input);
 
av_cold void ff_fft_init_arm(FFTContext *s)
{
    int cpu_flags = av_get_cpu_flags();
 
    if (have_vfp_vm(cpu_flags)) {
        s->fft_calc     = ff_fft_calc_vfp;
#if CONFIG_MDCT
        s->imdct_half   = ff_imdct_half_vfp;
#endif
    }
 
    if (have_neon(cpu_flags)) {
#if CONFIG_FFT
        if (s->nbits < 17) {
            s->fft_permute = ff_fft_permute_neon;
            s->fft_calc    = ff_fft_calc_neon;
        }
#endif
#if CONFIG_MDCT
        s->imdct_calc   = ff_imdct_calc_neon;
        s->imdct_half   = ff_imdct_half_neon;
        s->mdct_calc    = ff_mdct_calc_neon;
        s->mdct_permutation = FF_MDCT_PERM_INTERLEAVE;
#endif
    }
}