2 * This file is part of FFmpeg.
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.
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.
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
20 #include "libavutil/attributes.h"
21 #include "huffyuvencdsp.h"
24 // 0x7f7f7f7f or 0x7f7f7f7f7f7f7f7f or whatever, depending on the cpu's native arithmetic size
25 #define pb_7f (~0UL / 255 * 0x7f)
26 #define pb_80 (~0UL / 255 * 0x80)
28 static void diff_bytes_c(uint8_t *dst
, const uint8_t *src1
, const uint8_t *src2
, int w
)
32 #if !HAVE_FAST_UNALIGNED
33 if (((long)src1
| (long)src2
) & (sizeof(long) - 1)) {
34 for (i
= 0; i
+ 7 < w
; i
+= 8) {
35 dst
[i
+ 0] = src1
[i
+ 0] - src2
[i
+ 0];
36 dst
[i
+ 1] = src1
[i
+ 1] - src2
[i
+ 1];
37 dst
[i
+ 2] = src1
[i
+ 2] - src2
[i
+ 2];
38 dst
[i
+ 3] = src1
[i
+ 3] - src2
[i
+ 3];
39 dst
[i
+ 4] = src1
[i
+ 4] - src2
[i
+ 4];
40 dst
[i
+ 5] = src1
[i
+ 5] - src2
[i
+ 5];
41 dst
[i
+ 6] = src1
[i
+ 6] - src2
[i
+ 6];
42 dst
[i
+ 7] = src1
[i
+ 7] - src2
[i
+ 7];
46 for (i
= 0; i
<= w
- (int) sizeof(long); i
+= sizeof(long)) {
47 long a
= *(long *) (src1
+ i
);
48 long b
= *(long *) (src2
+ i
);
49 *(long *) (dst
+ i
) = ((a
| pb_80
) - (b
& pb_7f
)) ^
50 ((a
^ b
^ pb_80
) & pb_80
);
53 dst
[i
+ 0] = src1
[i
+ 0] - src2
[i
+ 0];
56 static void sub_hfyu_median_pred_c(uint8_t *dst
, const uint8_t *src1
,
57 const uint8_t *src2
, int w
,
58 int *left
, int *left_top
)
66 for (i
= 0; i
< w
; i
++) {
67 const int pred
= mid_pred(l
, src1
[i
], (l
+ src1
[i
] - lt
) & 0xFF);
77 av_cold
void ff_huffyuvencdsp_init(HuffYUVEncDSPContext
*c
)
79 c
->diff_bytes
= diff_bytes_c
;
80 c
->sub_hfyu_median_pred
= sub_hfyu_median_pred_c
;
83 ff_huffyuvencdsp_init_x86(c
);