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