| /* |
| * Copyright (c) 2007-2008 Ian Caulfield |
| * 2009 Ramiro Polla |
| * |
| * 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 "dsputil.h" |
| #include "mlp.h" |
| |
| static void ff_mlp_filter_channel(int32_t *state, const int32_t *coeff, |
| int firorder, int iirorder, |
| unsigned int filter_shift, int32_t mask, int blocksize, |
| int32_t *sample_buffer) |
| { |
| int32_t *firbuf = state; |
| int32_t *iirbuf = state + MAX_BLOCKSIZE + MAX_FIR_ORDER; |
| const int32_t *fircoeff = coeff; |
| const int32_t *iircoeff = coeff + MAX_FIR_ORDER; |
| int i; |
| |
| for (i = 0; i < blocksize; i++) { |
| int32_t residual = *sample_buffer; |
| unsigned int order; |
| int64_t accum = 0; |
| int32_t result; |
| |
| for (order = 0; order < firorder; order++) |
| accum += (int64_t) firbuf[order] * fircoeff[order]; |
| for (order = 0; order < iirorder; order++) |
| accum += (int64_t) iirbuf[order] * iircoeff[order]; |
| |
| accum = accum >> filter_shift; |
| result = (accum + residual) & mask; |
| |
| *--firbuf = result; |
| *--iirbuf = result - accum; |
| |
| *sample_buffer = result; |
| sample_buffer += MAX_CHANNELS; |
| } |
| } |
| |
| void ff_mlp_init(DSPContext* c, AVCodecContext *avctx) |
| { |
| c->mlp_filter_channel = ff_mlp_filter_channel; |
| if (ARCH_X86) |
| ff_mlp_init_x86(c, avctx); |
| } |