consistent include usage
[libav.git] / libavcodec / alpha / mpegvideo_alpha.c
CommitLineData
1e98dffb
NK
1/*
2 * Alpha optimized DSP utils
3 * Copyright (c) 2002 Falk Hueffner <falk@debian.org>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 */
19
20#include "asm.h"
21#include "../dsputil.h"
22#include "../mpegvideo.h"
23
24extern UINT8 zigzag_end[64];
25
26static void dct_unquantize_h263_axp(MpegEncContext *s,
27 DCTELEM *block, int n, int qscale)
28{
29 int i, level;
30 UINT64 qmul, qadd;
31 if (s->mb_intra) {
32 if (n < 4)
33 block[0] = block[0] * s->y_dc_scale;
34 else
35 block[0] = block[0] * s->c_dc_scale;
36 /* Catch up to aligned point. */
37 qmul = s->qscale << 1;
38 qadd = (s->qscale - 1) | 1;
39 for (i = 1; i < 4; ++i) {
40 level = block[i];
41 if (level) {
42 if (level < 0) {
43 level = level * qmul - qadd;
44 } else {
45 level = level * qmul + qadd;
46 }
47 block[i] = level;
48 }
49 }
50 block += 4;
51 i = 60 / 4;
52 } else {
53 i = zigzag_end[s->block_last_index[n]] / 4;
54 }
55 qmul = s->qscale << 1;
56 qadd = WORD_VEC((qscale - 1) | 1);
57 do {
58 UINT64 levels, negmask, zeromask, corr;
59 levels = ldq(block);
60 if (levels == 0)
61 continue;
62 zeromask = cmpbge(0, levels);
63 zeromask &= zeromask >> 1;
64 /* Negate all negative words. */
65 negmask = maxsw4(levels, WORD_VEC(0xffff)); /* negative -> ffff (-1) */
66 negmask = minsw4(negmask, 0); /* positive -> 0000 (0) */
67 corr = negmask & WORD_VEC(0x0001); /* twos-complement correction */
68 levels ^= negmask;
69 levels += corr;
70
71 levels = levels * qmul;
72 levels += zap(qadd, zeromask);
73
74 /* Re-negate negative words. */
75 levels -= corr;
76 levels ^= negmask;
77
78 stq(levels, block);
79 } while (block += 4, --i);
80}
81
82void MPV_common_init_axp(MpegEncContext *s)
83{
84 if (amask(AMASK_MVI) == 0) {
85 if (s->out_format == FMT_H263)
86 s->dct_unquantize = dct_unquantize_h263_axp;
87 }
88}