yading@10: /*
yading@10:  * Copyright (c) 2004 Gildas Bazin
yading@10:  * Copyright (c) 2010 Mans Rullgard <mans@mansr.com>
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include "config.h"
yading@10: #include "dcadsp.h"
yading@10: 
yading@10: static void dca_lfe_fir_c(float *out, const float *in, const float *coefs,
yading@10:                           int decifactor, float scale)
yading@10: {
yading@10:     float *out2 = out + decifactor;
yading@10:     const float *cf0 = coefs;
yading@10:     const float *cf1 = coefs + 256;
yading@10:     int j, k;
yading@10: 
yading@10:     /* One decimated sample generates 2*decifactor interpolated ones */
yading@10:     for (k = 0; k < decifactor; k++) {
yading@10:         float v0 = 0.0;
yading@10:         float v1 = 0.0;
yading@10:         for (j = 0; j < 256 / decifactor; j++) {
yading@10:             float s = in[-j];
yading@10:             v0 += s * *cf0++;
yading@10:             v1 += s * *--cf1;
yading@10:         }
yading@10:         *out++  = v0 * scale;
yading@10:         *out2++ = v1 * scale;
yading@10:     }
yading@10: }
yading@10: 
yading@10: void ff_dcadsp_init(DCADSPContext *s)
yading@10: {
yading@10:     s->lfe_fir = dca_lfe_fir_c;
yading@10:     if (ARCH_ARM) ff_dcadsp_init_arm(s);
yading@10: }