mlp: Re-enable x86-optimized DSP functions.
[libav.git] / libavcodec / mlpdsp.c
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 "libavcodec/mlp.h"
23 #include "dsputil.h"
24
25 static void ff_mlp_filter_channel(int32_t *state, const int32_t *coeff,
26 int firorder, int iirorder,
27 unsigned int filter_shift, int32_t mask, int blocksize,
28 int32_t *sample_buffer)
29 {
30 int32_t *firbuf = state;
31 int32_t *iirbuf = state + MAX_BLOCKSIZE + MAX_FIR_ORDER;
32 const int32_t *fircoeff = coeff;
33 const int32_t *iircoeff = coeff + MAX_FIR_ORDER;
34 int i;
35
36 for (i = 0; i < blocksize; i++) {
37 int32_t residual = *sample_buffer;
38 unsigned int order;
39 int64_t accum = 0;
40 int32_t result;
41
42 for (order = 0; order < firorder; order++)
43 accum += (int64_t) firbuf[order] * fircoeff[order];
44 for (order = 0; order < iirorder; order++)
45 accum += (int64_t) iirbuf[order] * iircoeff[order];
46
47 accum = accum >> filter_shift;
48 result = (accum + residual) & mask;
49
50 *--firbuf = result;
51 *--iirbuf = result - accum;
52
53 *sample_buffer = result;
54 sample_buffer += MAX_CHANNELS;
55 }
56 }
57
58 void ff_mlp_init_x86(DSPContext* c, AVCodecContext *avctx);
59
60 void ff_mlp_init(DSPContext* c, AVCodecContext *avctx)
61 {
62 c->mlp_filter_channel = ff_mlp_filter_channel;
63 if (ARCH_X86)
64 ff_mlp_init_x86(c, avctx);
65 }