| /* |
| * 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); |
| } |