Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / huffyuvdsp.c
CommitLineData
2ba45a60
DM
1/*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19#include <stdint.h>
20
21#include "config.h"
22#include "libavutil/attributes.h"
23#include "mathops.h"
24#include "huffyuvdsp.h"
25
26// 0x7f7f7f7f or 0x7f7f7f7f7f7f7f7f or whatever, depending on the cpu's native arithmetic size
27#define pb_7f (~0UL / 255 * 0x7f)
28#define pb_80 (~0UL / 255 * 0x80)
29
30static void add_bytes_c(uint8_t *dst, uint8_t *src, intptr_t w)
31{
32 long i;
33
34 for (i = 0; i <= w - (int) sizeof(long); i += sizeof(long)) {
35 long a = *(long *) (src + i);
36 long b = *(long *) (dst + i);
37 *(long *) (dst + i) = ((a & pb_7f) + (b & pb_7f)) ^ ((a ^ b) & pb_80);
38 }
39 for (; i < w; i++)
40 dst[i + 0] += src[i + 0];
41}
42
43static void add_hfyu_median_pred_c(uint8_t *dst, const uint8_t *src1,
44 const uint8_t *diff, intptr_t w,
45 int *left, int *left_top)
46{
47 int i;
48 uint8_t l, lt;
49
50 l = *left;
51 lt = *left_top;
52
53 for (i = 0; i < w; i++) {
54 l = mid_pred(l, src1[i], (l + src1[i] - lt) & 0xFF) + diff[i];
55 lt = src1[i];
56 dst[i] = l;
57 }
58
59 *left = l;
60 *left_top = lt;
61}
62
63static int add_hfyu_left_pred_c(uint8_t *dst, const uint8_t *src, intptr_t w,
64 int acc)
65{
66 int i;
67
68 for (i = 0; i < w - 1; i++) {
69 acc += src[i];
70 dst[i] = acc;
71 i++;
72 acc += src[i];
73 dst[i] = acc;
74 }
75
76 for (; i < w; i++) {
77 acc += src[i];
78 dst[i] = acc;
79 }
80
81 return acc;
82}
83
84static void add_hfyu_left_pred_bgr32_c(uint8_t *dst, const uint8_t *src,
85 intptr_t w, uint8_t *left)
86{
87 int i;
88 uint8_t r = left[R], g = left[G], b = left[B], a = left[A];
89
90 for (i = 0; i < w; i++) {
91 b += src[4 * i + B];
92 g += src[4 * i + G];
93 r += src[4 * i + R];
94 a += src[4 * i + A];
95
96 dst[4 * i + B] = b;
97 dst[4 * i + G] = g;
98 dst[4 * i + R] = r;
99 dst[4 * i + A] = a;
100 }
101
102 left[B] = b;
103 left[G] = g;
104 left[R] = r;
105 left[A] = a;
106}
107
108av_cold void ff_huffyuvdsp_init(HuffYUVDSPContext *c)
109{
110 c->add_bytes = add_bytes_c;
111 c->add_hfyu_median_pred = add_hfyu_median_pred_c;
112 c->add_hfyu_left_pred = add_hfyu_left_pred_c;
113 c->add_hfyu_left_pred_bgr32 = add_hfyu_left_pred_bgr32_c;
114
115 if (ARCH_X86)
116 ff_huffyuvdsp_init_x86(c);
117}