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mlpdec: Move MLP's filter_channel() to dsputils.
Originally committed as revision 18721 to svn://svn.ffmpeg.org/ffmpeg/trunk
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/* | ||
* 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 | ||
*/ | ||
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#include "dsputil.h" | ||
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static void ff_mlp_filter_channel(int32_t *firbuf, const int32_t *fircoeff, int firorder, | ||
int32_t *iirbuf, const int32_t *iircoeff, int iirorder, | ||
unsigned int filter_shift, int32_t mask, int blocksize, | ||
int32_t *sample_buffer) | ||
{ | ||
int i; | ||
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for (i = 0; i < blocksize; i++) { | ||
int32_t residual = *sample_buffer; | ||
unsigned int order; | ||
int64_t accum = 0; | ||
int32_t result; | ||
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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]; | ||
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accum = accum >> filter_shift; | ||
result = (accum + residual) & mask; | ||
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*--firbuf = result; | ||
*--iirbuf = result - accum; | ||
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*sample_buffer = result; | ||
sample_buffer += 8; | ||
} | ||
} | ||
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void ff_mlp_init(DSPContext* c, AVCodecContext *avctx) | ||
{ | ||
c->mlp_filter_channel = ff_mlp_filter_channel; | ||
} |