1 /*
2  * thirdpel DSP functions
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  * thirdpel DSP functions
24  */
25 
26 #ifndef AVCODEC_TPELDSP_H
27 #define AVCODEC_TPELDSP_H
28 
29 #include <stdint.h>
30 
31 /* add and put pixel (decoding) */
32 // blocksizes for hpel_pixels_func are 8x4,8x8 16x8 16x16
33 // h for hpel_pixels_func is limited to {width/2, width} but never larger
34 // than 16 and never smaller than 4
35 typedef void (*tpel_mc_func)(uint8_t *block /* align width (8 or 16) */,
36                              const uint8_t *pixels /* align 1 */,
37                              int line_size, int w, int h);
38 
39 /**
40  * thirdpel DSP context
41  */
42 typedef struct TpelDSPContext {
43     /**
44      * Thirdpel motion compensation with rounding (a + b + 1) >> 1.
45      * this is an array[12] of motion compensation functions for the
46      * 9 thirdpel positions<br>
47      * *pixels_tab[xthirdpel + 4 * ythirdpel]
48      * @param block destination where the result is stored
49      * @param pixels source
50      * @param line_size number of bytes in a horizontal line of block
51      * @param h height
52      */
53     tpel_mc_func put_tpel_pixels_tab[11]; // FIXME individual func ptr per width?
54     tpel_mc_func avg_tpel_pixels_tab[11]; // FIXME individual func ptr per width?
55 } TpelDSPContext;
56 
57 void ff_tpeldsp_init(TpelDSPContext *c);
58 
59 #endif /* AVCODEC_TPELDSP_H */
60