mlpdec: Move MLP's filter_channel() to dsputils.
[libav.git] / libavcodec / mlpdsp.c
CommitLineData
bf4f19dc
RP
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 "dsputil.h"
23
24static void ff_mlp_filter_channel(int32_t *firbuf, const int32_t *fircoeff, int firorder,
25 int32_t *iirbuf, const int32_t *iircoeff, int iirorder,
26 unsigned int filter_shift, int32_t mask, int blocksize,
27 int32_t *sample_buffer)
28{
29 int i;
30
31 for (i = 0; i < blocksize; i++) {
32 int32_t residual = *sample_buffer;
33 unsigned int order;
34 int64_t accum = 0;
35 int32_t result;
36
37 for (order = 0; order < firorder; order++)
38 accum += (int64_t) firbuf[order] * fircoeff[order];
39 for (order = 0; order < iirorder; order++)
40 accum += (int64_t) iirbuf[order] * iircoeff[order];
41
42 accum = accum >> filter_shift;
43 result = (accum + residual) & mask;
44
45 *--firbuf = result;
46 *--iirbuf = result - accum;
47
48 *sample_buffer = result;
49 sample_buffer += 8;
50 }
51}
52
53void ff_mlp_init(DSPContext* c, AVCodecContext *avctx)
54{
55 c->mlp_filter_channel = ff_mlp_filter_channel;
56}