~ubuntu-branches/ubuntu/trusty/libav/trusty

/*

 * Copyright (c) 2007-2008 Ian Caulfield

 *               2009 Ramiro Polla

 *

 * This file is part of Libav.

 *

 * Libav 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.

 *

 * Libav 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 Libav; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

#include "libavcodec/mlp.h"

#include "dsputil.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);

}