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  1. /*
  2.  * Copyright (c) 2007-2008 Ian Caulfield
  3.  *               2009 Ramiro Polla
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #include "config.h"
  23. #include "libavutil/attributes.h"
  24. #include "mlpdsp.h"
  25. #include "mlp.h"
  26.  
  27. static void mlp_filter_channel(int32_t *state, const int32_t *coeff,
  28.                                int firorder, int iirorder,
  29.                                unsigned int filter_shift, int32_t mask,
  30.                                int blocksize, int32_t *sample_buffer)
  31. {
  32.     int32_t *firbuf = state;
  33.     int32_t *iirbuf = state + MAX_BLOCKSIZE + MAX_FIR_ORDER;
  34.     const int32_t *fircoeff = coeff;
  35.     const int32_t *iircoeff = coeff + MAX_FIR_ORDER;
  36.     int i;
  37.  
  38.     for (i = 0; i < blocksize; i++) {
  39.         int32_t residual = *sample_buffer;
  40.         unsigned int order;
  41.         int64_t accum = 0;
  42.         int32_t result;
  43.  
  44.         for (order = 0; order < firorder; order++)
  45.             accum += (int64_t) firbuf[order] * fircoeff[order];
  46.         for (order = 0; order < iirorder; order++)
  47.             accum += (int64_t) iirbuf[order] * iircoeff[order];
  48.  
  49.         accum  = accum >> filter_shift;
  50.         result = (accum + residual) & mask;
  51.  
  52.         *--firbuf = result;
  53.         *--iirbuf = result - accum;
  54.  
  55.         *sample_buffer = result;
  56.         sample_buffer += MAX_CHANNELS;
  57.     }
  58. }
  59.  
  60. av_cold void ff_mlpdsp_init(MLPDSPContext *c)
  61. {
  62.     c->mlp_filter_channel = mlp_filter_channel;
  63.     if (ARCH_X86)
  64.         ff_mlpdsp_init_x86(c);
  65. }
  66.