1 /******************************************************************************
2  *
3  * Copyright (C) 2015 The Android Open Source Project
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at:
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  *
17  *****************************************************************************
18  * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
19 */
20 /**
21 *******************************************************************************
22 * @file
23 *  icv_sad.c
24 *
25 * @brief
26 *  This file contains the functions to compute SAD
27 *
28 * @author
29 *  Ittiam
30 *
31 * @par List of Functions:
32 *  sad_8x4()
33 *
34 * @remarks
35 *  None
36 *
37 *******************************************************************************
38 */
39 /*****************************************************************************/
40 /* File Includes                                                             */
41 /*****************************************************************************/
42 /* System include files */
43 #include <stdio.h>
44 #include <stdint.h>
45 #include <string.h>
46 #include <stdlib.h>
47 #include <assert.h>
48 
49 /* User include files */
50 #include "icv_datatypes.h"
51 #include "icv_macros.h"
52 #include "icv_platform_macros.h"
53 #include "icv.h"
54 
55 /**
56 *******************************************************************************
57 *
58 * @brief
59 *  Compute 8x4 SAD
60 *
61 * @par   Description
62 *  Compute 8x4 sum of absolute differences between source and reference block
63 *
64 * @param[in] pu1_src
65 *  Source buffer
66 *
67 * @param[in] pu1_ref
68 *  Reference buffer
69 *
70 * @param[in] src_strd
71 *  Source stride
72 *
73 * @param[in] ref_strd
74 *  Reference stride
75 *
76 * @param[in] wd
77 *  Assumed to be 8
78 *
79 * @param[in] ht
80 *  Assumed to be 4
81 
82 * @returns
83 *  SAD
84 *
85 * @remarks
86 *
87 *******************************************************************************
88 */
89 WORD32 icv_sad_8x4(UWORD8 *pu1_src,
90                    UWORD8 *pu1_ref,
91                    WORD32 src_strd,
92                    WORD32 ref_strd,
93                    WORD32 wd,
94                    WORD32 ht)
95 {
96     WORD32 sad;
97     WORD32 i;
98     WORD32 j;
99     UNUSED(wd);
100     UNUSED(ht);
101 
102     ASSERT(wd == 8);
103     ASSERT(ht == 4);
104 
105     sad = 0;
106 
107     for(j = 0; j < 4; j++)
108     {
109         for(i = 0; i < 8; i++)
110         {
111             WORD32 src;
112             WORD32 ref;
113 
114             src = *pu1_src++;
115             ref = *pu1_ref++;
116 
117             sad += ABS_DIF(src, ref);
118         }
119         pu1_src += (src_strd - 8);
120         pu1_ref += (ref_strd - 8);
121     }
122 
123     return sad;
124 }
125