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videodsp.h
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1 /*
2  * Copyright (C) 2012 Ronald S. Bultje
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 /**
22  * @file
23  * Core video DSP helper functions
24  */
25 
26 #ifndef AVCODEC_VIDEODSP_H
27 #define AVCODEC_VIDEODSP_H
28 
29 #include <stddef.h>
30 #include <stdint.h>
31 
32 #define EMULATED_EDGE(depth) \
33 void ff_emulated_edge_mc_ ## depth (uint8_t *buf, const uint8_t *src, ptrdiff_t linesize,\
34  int block_w, int block_h,\
35  int src_x, int src_y, int w, int h);
36 
38 EMULATED_EDGE(16)
39 
40 typedef struct VideoDSPContext {
41  /**
42  * Copy a rectangular area of samples to a temporary buffer and replicate
43  * the border samples.
44  *
45  * @param buf destination buffer
46  * @param src source buffer
47  * @param linesize number of bytes between 2 vertically adjacent samples
48  * in both the source and destination buffers
49  * @param block_w width of block
50  * @param block_h height of block
51  * @param src_x x coordinate of the top left sample of the block in the
52  * source buffer
53  * @param src_y y coordinate of the top left sample of the block in the
54  * source buffer
55  * @param w width of the source buffer
56  * @param h height of the source buffer
57  */
58  void (*emulated_edge_mc)(uint8_t *buf, const uint8_t *src,
59  ptrdiff_t linesize, int block_w, int block_h,
60  int src_x, int src_y, int w, int h);
61 
62  /**
63  * Prefetch memory into cache (if supported by hardware).
64  *
65  * @buf pointer to buffer to prefetch memory from
66  * @stride distance between two lines of buf (in bytes)
67  * @h number of lines to prefetch
68  */
69  void (*prefetch)(uint8_t *buf, ptrdiff_t stride, int h);
71 
72 void ff_videodsp_init(VideoDSPContext *ctx, int bpc);
73 
74 /* for internal use only (i.e. called by ff_videodsp_init() */
75 void ff_videodsp_init_arm(VideoDSPContext *ctx, int bpc);
76 void ff_videodsp_init_ppc(VideoDSPContext *ctx, int bpc);
77 void ff_videodsp_init_x86(VideoDSPContext *ctx, int bpc);
78 
79 #endif /* AVCODEC_VIDEODSP_H */