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ffmpeg / libavcodec / dcadsp.c @ 2912e87a

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/*
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 * Copyright (c) 2004 Gildas Bazin
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 * Copyright (c) 2010 Mans Rullgard <mans@mansr.com>
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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 "config.h"
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#include "dcadsp.h"
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static void dca_lfe_fir_c(float *out, const float *in, const float *coefs,
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                          int decifactor, float scale)
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{
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    float *out2 = out + decifactor;
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    const float *cf0 = coefs;
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    const float *cf1 = coefs + 256;
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    int j, k;
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    /* One decimated sample generates 2*decifactor interpolated ones */
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    for (k = 0; k < decifactor; k++) {
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        float v0 = 0.0;
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        float v1 = 0.0;
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        for (j = 0; j < 256 / decifactor; j++) {
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            float s = in[-j];
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            v0 += s * *cf0++;
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            v1 += s * *--cf1;
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        }
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        *out++  = v0 * scale;
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        *out2++ = v1 * scale;
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    }
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}
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void ff_dcadsp_init(DCADSPContext *s)
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{
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    s->lfe_fir = dca_lfe_fir_c;
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    if (ARCH_ARM) ff_dcadsp_init_arm(s);
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}