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me_cmp.h
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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 #ifndef AVCODEC_ME_CMP_H
20 #define AVCODEC_ME_CMP_H
21 
22 #include <stdint.h>
23 
24 #include "avcodec.h"
25 
26 extern uint32_t ff_square_tab[512];
27 
28 
29 /* minimum alignment rules ;)
30  * If you notice errors in the align stuff, need more alignment for some ASM code
31  * for some CPU or need to use a function with less aligned data then send a mail
32  * to the ffmpeg-devel mailing list, ...
33  *
34  * !warning These alignments might not match reality, (missing attribute((align))
35  * stuff somewhere possible).
36  * I (Michael) did not check them, these are just the alignments which I think
37  * could be reached easily ...
38  *
39  * !future video codecs might need functions with less strict alignment
40  */
41 
42 struct MpegEncContext;
43 /* Motion estimation:
44  * h is limited to { width / 2, width, 2 * width },
45  * but never larger than 16 and never smaller than 2.
46  * Although currently h < 4 is not used as functions with
47  * width < 8 are neither used nor implemented. */
48 typedef int (*me_cmp_func)(struct MpegEncContext *c,
49  uint8_t *blk1 /* align width (8 or 16) */,
50  uint8_t *blk2 /* align 1 */, ptrdiff_t stride,
51  int h);
52 
53 typedef struct MECmpContext {
54  int (*sum_abs_dctelem)(int16_t *block /* align 16 */);
55 
56  me_cmp_func sad[6]; /* identical to pix_absAxA except additional void * */
70 
75  me_cmp_func ildct_cmp[6]; // only width 16 used
76  me_cmp_func frame_skip_cmp[6]; // only width 8 used
77 
79 } MECmpContext;
80 
81 void ff_me_cmp_init_static(void);
82 
83 int ff_check_alignment(void);
84 
90 
92 
94 
95 #endif /* AVCODEC_ME_CMP_H */