mlp: include mlp.h and use MAX_CHANNELS instead of hardcoding value 8.
[libav.git] / libavcodec / mlpdsp.c
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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
42e64bf8 22#include "libavcodec/mlp.h"
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23#include "dsputil.h"
24
25static void ff_mlp_filter_channel(int32_t *firbuf, const int32_t *fircoeff, int firorder,
26 int32_t *iirbuf, const int32_t *iircoeff, int iirorder,
27 unsigned int filter_shift, int32_t mask, int blocksize,
28 int32_t *sample_buffer)
29{
30 int i;
31
32 for (i = 0; i < blocksize; i++) {
33 int32_t residual = *sample_buffer;
34 unsigned int order;
35 int64_t accum = 0;
36 int32_t result;
37
38 for (order = 0; order < firorder; order++)
39 accum += (int64_t) firbuf[order] * fircoeff[order];
40 for (order = 0; order < iirorder; order++)
41 accum += (int64_t) iirbuf[order] * iircoeff[order];
42
43 accum = accum >> filter_shift;
44 result = (accum + residual) & mask;
45
46 *--firbuf = result;
47 *--iirbuf = result - accum;
48
49 *sample_buffer = result;
42e64bf8 50 sample_buffer += MAX_CHANNELS;
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51 }
52}
53
54void ff_mlp_init(DSPContext* c, AVCodecContext *avctx)
55{
56 c->mlp_filter_channel = ff_mlp_filter_channel;
57}