FFmpeg
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 const 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 
80 } MECmpContext;
81 
82 int ff_check_alignment(void);
83 
90 
92 
94 
95 #endif /* AVCODEC_ME_CMP_H */
me_cmp_func frame_skip_cmp[6]
Definition: me_cmp.h:76
int(* sum_abs_dctelem)(int16_t *block)
Definition: me_cmp.h:54
me_cmp_func w53[6]
Definition: me_cmp.h:66
me_cmp_func dct_max[6]
Definition: me_cmp.h:68
GLint GLenum type
Definition: opengl_enc.c:104
void ff_me_cmp_init_ppc(MECmpContext *c, AVCodecContext *avctx)
Definition: me_cmp.c:726
me_cmp_func me_pre_cmp[6]
Definition: me_cmp.h:71
me_cmp_func dct_sad[6]
Definition: me_cmp.h:59
me_cmp_func hadamard8_diff[6]
Definition: me_cmp.h:58
The exact code depends on how similar the blocks are and how related they are to the block
uint8_t
me_cmp_func mb_cmp[6]
Definition: me_cmp.h:74
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
me_cmp_func dct264_sad[6]
Definition: me_cmp.h:69
me_cmp_func nsse[6]
Definition: me_cmp.h:65
int(* me_cmp_func)(struct MpegEncContext *c, uint8_t *blk1, uint8_t *blk2, ptrdiff_t stride, int h)
Definition: me_cmp.h:48
const uint32_t ff_square_tab[512]
Definition: me_cmp.c:33
void ff_me_cmp_init_mips(MECmpContext *c, AVCodecContext *avctx)
void ff_me_cmp_init_alpha(MECmpContext *c, AVCodecContext *avctx)
Definition: me_cmp_alpha.c:305
me_cmp_func pix_abs[2][4]
Definition: me_cmp.h:78
me_cmp_func bit[6]
Definition: me_cmp.h:61
void ff_me_cmp_init(MECmpContext *c, AVCodecContext *avctx)
Definition: me_cmp.c:1035
me_cmp_func vsse[6]
Definition: me_cmp.h:64
me_cmp_func vsad[6]
Definition: me_cmp.h:63
static av_always_inline int cmp(MpegEncContext *s, const int x, const int y, const int subx, const int suby, const int size, const int h, int ref_index, int src_index, me_cmp_func cmp_func, me_cmp_func chroma_cmp_func, const int flags)
compares a block (either a full macroblock or a partition thereof) against a proposed motion-compensa...
Definition: motion_est.c:260
void ff_set_cmp(MECmpContext *c, me_cmp_func *cmp, int type)
Definition: me_cmp.c:474
me_cmp_func rd[6]
Definition: me_cmp.h:62
Libavcodec external API header.
main external API structure.
Definition: avcodec.h:1568
int ff_check_alignment(void)
Definition: me_cmp.c:1014
me_cmp_func median_sad[6]
Definition: me_cmp.h:79
me_cmp_func me_cmp[6]
Definition: me_cmp.h:72
me_cmp_func sad[6]
Definition: me_cmp.h:56
me_cmp_func sse[6]
Definition: me_cmp.h:57
MpegEncContext.
Definition: mpegvideo.h:81
int
me_cmp_func me_sub_cmp[6]
Definition: me_cmp.h:73
void ff_me_cmp_init_arm(MECmpContext *c, AVCodecContext *avctx)
me_cmp_func quant_psnr[6]
Definition: me_cmp.h:60
me_cmp_func w97[6]
Definition: me_cmp.h:67
void ff_dsputil_init_dwt(MECmpContext *c)
Definition: snow_dwt.c:842
#define stride
void ff_me_cmp_init_x86(MECmpContext *c, AVCodecContext *avctx)
me_cmp_func ildct_cmp[6]
Definition: me_cmp.h:75