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50 lines
1.6 KiB
50 lines
1.6 KiB
15 years ago
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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 FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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 "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, float bias)
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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) + bias;
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*out2++ = (v1 * scale) + bias;
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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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}
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