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ffmpeg / libavcodec / mlpdsp.c @ 2912e87a

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/*
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 * Copyright (c) 2007-2008 Ian Caulfield
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 *               2009 Ramiro Polla
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 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "libavcodec/mlp.h"
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#include "dsputil.h"
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static void ff_mlp_filter_channel(int32_t *state, const int32_t *coeff,
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                                  int firorder, int iirorder,
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                                  unsigned int filter_shift, int32_t mask, int blocksize,
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                                  int32_t *sample_buffer)
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{
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    int32_t *firbuf = state;
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    int32_t *iirbuf = state + MAX_BLOCKSIZE + MAX_FIR_ORDER;
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    const int32_t *fircoeff = coeff;
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    const int32_t *iircoeff = coeff + MAX_FIR_ORDER;
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    int i;
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    for (i = 0; i < blocksize; i++) {
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        int32_t residual = *sample_buffer;
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        unsigned int order;
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        int64_t accum = 0;
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        int32_t result;
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        for (order = 0; order < firorder; order++)
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            accum += (int64_t) firbuf[order] * fircoeff[order];
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        for (order = 0; order < iirorder; order++)
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            accum += (int64_t) iirbuf[order] * iircoeff[order];
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        accum  = accum >> filter_shift;
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        result = (accum + residual) & mask;
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        *--firbuf = result;
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        *--iirbuf = result - accum;
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        *sample_buffer = result;
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        sample_buffer += MAX_CHANNELS;
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    }
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}
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void ff_mlp_init(DSPContext* c, AVCodecContext *avctx)
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{
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    c->mlp_filter_channel = ff_mlp_filter_channel;
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    if (ARCH_X86)
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        ff_mlp_init_x86(c, avctx);
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}