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      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