yading@10: /*
yading@10:  * Copyright (c) 2007-2008 Ian Caulfield
yading@10:  *               2009 Ramiro Polla
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 "mlpdsp.h"
yading@10: #include "mlp.h"
yading@10: 
yading@10: static void ff_mlp_filter_channel(int32_t *state, const int32_t *coeff,
yading@10:                                   int firorder, int iirorder,
yading@10:                                   unsigned int filter_shift, int32_t mask, int blocksize,
yading@10:                                   int32_t *sample_buffer)
yading@10: {
yading@10:     int32_t *firbuf = state;
yading@10:     int32_t *iirbuf = state + MAX_BLOCKSIZE + MAX_FIR_ORDER;
yading@10:     const int32_t *fircoeff = coeff;
yading@10:     const int32_t *iircoeff = coeff + MAX_FIR_ORDER;
yading@10:     int i;
yading@10: 
yading@10:     for (i = 0; i < blocksize; i++) {
yading@10:         int32_t residual = *sample_buffer;
yading@10:         unsigned int order;
yading@10:         int64_t accum = 0;
yading@10:         int32_t result;
yading@10: 
yading@10:         for (order = 0; order < firorder; order++)
yading@10:             accum += (int64_t) firbuf[order] * fircoeff[order];
yading@10:         for (order = 0; order < iirorder; order++)
yading@10:             accum += (int64_t) iirbuf[order] * iircoeff[order];
yading@10: 
yading@10:         accum  = accum >> filter_shift;
yading@10:         result = (accum + residual) & mask;
yading@10: 
yading@10:         *--firbuf = result;
yading@10:         *--iirbuf = result - accum;
yading@10: 
yading@10:         *sample_buffer = result;
yading@10:         sample_buffer += MAX_CHANNELS;
yading@10:     }
yading@10: }
yading@10: 
yading@10: void ff_mlpdsp_init(MLPDSPContext *c)
yading@10: {
yading@10:     c->mlp_filter_channel = ff_mlp_filter_channel;
yading@10:     if (ARCH_X86)
yading@10:         ff_mlpdsp_init_x86(c);
yading@10: }