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110 lines
3.4 KiB
C
110 lines
3.4 KiB
C
/*
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* filters.h
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*
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* Description: TTAv1 filter functions
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* Developed by: Alexander Djourik <sasha@iszf.irk.ru>
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* Pavel Zhilin <pzh@iszf.irk.ru>
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*
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* Copyright (c) 1999-2004 Alexander Djourik. All rights reserved.
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*
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*/
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* aint with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Please see the file COPYING in this directory for full copyright
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* information.
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*/
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#ifndef FILTERS_H
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#define FILTERS_H
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///////// Filter Settings //////////
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static long flt_set[3] = {10, 9, 10};
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static void
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memshl (register long *pA, register long *pB) {
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*pA++ = *pB++;
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*pA++ = *pB++;
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*pA++ = *pB++;
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*pA++ = *pB++;
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*pA++ = *pB++;
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*pA++ = *pB++;
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*pA++ = *pB++;
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*pA = *pB;
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}
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static void
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hybrid_filter (fltst *fs, long *in) {
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register long *pA = fs->dl;
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register long *pB = fs->qm;
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register long *pM = fs->dx;
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register long sum = fs->round;
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if (!fs->error) {
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sum += *pA++ * *pB, pB++;
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sum += *pA++ * *pB, pB++;
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sum += *pA++ * *pB, pB++;
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sum += *pA++ * *pB, pB++;
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sum += *pA++ * *pB, pB++;
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sum += *pA++ * *pB, pB++;
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sum += *pA++ * *pB, pB++;
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sum += *pA++ * *pB, pB++; pM += 8;
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} else if (fs->error < 0) {
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sum += *pA++ * (*pB -= *pM++), pB++;
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sum += *pA++ * (*pB -= *pM++), pB++;
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sum += *pA++ * (*pB -= *pM++), pB++;
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sum += *pA++ * (*pB -= *pM++), pB++;
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sum += *pA++ * (*pB -= *pM++), pB++;
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sum += *pA++ * (*pB -= *pM++), pB++;
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sum += *pA++ * (*pB -= *pM++), pB++;
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sum += *pA++ * (*pB -= *pM++), pB++;
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} else {
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sum += *pA++ * (*pB += *pM++), pB++;
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sum += *pA++ * (*pB += *pM++), pB++;
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sum += *pA++ * (*pB += *pM++), pB++;
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sum += *pA++ * (*pB += *pM++), pB++;
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sum += *pA++ * (*pB += *pM++), pB++;
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sum += *pA++ * (*pB += *pM++), pB++;
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sum += *pA++ * (*pB += *pM++), pB++;
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sum += *pA++ * (*pB += *pM++), pB++;
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}
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*(pM-0) = ((*(pA-1) >> 30) | 1) << 2;
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*(pM-1) = ((*(pA-2) >> 30) | 1) << 1;
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*(pM-2) = ((*(pA-3) >> 30) | 1) << 1;
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*(pM-3) = ((*(pA-4) >> 30) | 1);
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fs->error = *in;
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*in += (sum >> fs->shift);
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*pA = *in;
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*(pA-1) = *(pA-0) - *(pA-1);
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*(pA-2) = *(pA-1) - *(pA-2);
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*(pA-3) = *(pA-2) - *(pA-3);
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memshl (fs->dl, fs->dl + 1);
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memshl (fs->dx, fs->dx + 1);
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}
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static void
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filter_init (fltst *fs, long shift) {
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memset (fs, 0, sizeof(fltst));
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fs->shift = shift;
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fs->round = 1 << (shift - 1);
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}
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#endif /* FILTERS_H */
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