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      1 /******************************************************************************
      2 *
      3 * Copyright (C) 2012 Ittiam Systems Pvt Ltd, Bangalore
      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 /**
     19  *******************************************************************************
     20  * @file
     21  *  ihevcd_itrans_recon_dc.c
     22  *
     23  * @brief
     24  *  Contains functions for DC inverse transform and reconstruction
     25  *
     26  * @author
     27  *  Ittiam
     28  *
     29  * @par List of Functions:
     30  * - ihevcd_itrans_recon_dc_luma()
     31  * - ihevcd_itrans_recon_dc_chroma()
     32  *
     33  * @remarks
     34  *  None
     35  *
     36  *******************************************************************************
     37  */
     38 /*****************************************************************************/
     39 /* File Includes                                                             */
     40 /*****************************************************************************/
     41 #include <stdio.h>
     42 #include <stddef.h>
     43 #include <stdlib.h>
     44 #include <string.h>
     45 
     46 #include "ihevc_typedefs.h"
     47 #include "iv.h"
     48 #include "ivd.h"
     49 #include "ihevcd_cxa.h"
     50 
     51 #include "ihevc_defs.h"
     52 #include "ihevc_debug.h"
     53 #include "ihevc_structs.h"
     54 #include "ihevc_cabac_tables.h"
     55 #include "ihevc_macros.h"
     56 #include "ihevc_platform_macros.h"
     57 
     58 #include "ihevcd_defs.h"
     59 #include "ihevcd_function_selector.h"
     60 #include "ihevcd_structs.h"
     61 #include "ihevcd_error.h"
     62 #include "ihevcd_bitstream.h"
     63 #include "ihevc_common_tables.h"
     64 
     65 /* Intra pred includes */
     66 #include "ihevc_intra_pred.h"
     67 
     68 /* Inverse transform common module includes */
     69 #include "ihevc_trans_tables.h"
     70 #include "ihevc_trans_macros.h"
     71 #include "ihevc_itrans_recon.h"
     72 #include "ihevc_recon.h"
     73 #include "ihevc_chroma_itrans_recon.h"
     74 #include "ihevc_chroma_recon.h"
     75 
     76 /* Decoder includes */
     77 #include "ihevcd_common_tables.h"
     78 #include "ihevcd_iquant_itrans_recon_ctb.h"
     79 #include "ihevcd_debug.h"
     80 #include "ihevcd_profile.h"
     81 #include "ihevcd_statistics.h"
     82 #include "ihevcd_itrans_recon_dc.h"
     83 
     84 
     85 
     86 void ihevcd_itrans_recon_dc_luma(UWORD8 *pu1_pred,
     87                                  UWORD8 *pu1_dst,
     88                                  WORD32 pred_strd,
     89                                  WORD32 dst_strd,
     90                                  WORD32 log2_trans_size,
     91                                  WORD16 i2_coeff_value)
     92 {
     93     WORD32 row, col;
     94     WORD32 add, shift;
     95     WORD32 dc_value, quant_out;
     96     WORD32 trans_size;
     97 
     98     trans_size = (1 << log2_trans_size);
     99 
    100     quant_out = i2_coeff_value;
    101 
    102     shift = IT_SHIFT_STAGE_1;
    103     add = 1 << (shift - 1);
    104     dc_value = CLIP_S16((quant_out * 64 + add) >> shift);
    105     shift = IT_SHIFT_STAGE_2;
    106     add = 1 << (shift - 1);
    107     dc_value = CLIP_S16((dc_value * 64 + add) >> shift);
    108 
    109     for(row = 0; row < trans_size; row++)
    110         for(col = 0; col < trans_size; col++)
    111             pu1_dst[row * dst_strd + col] = CLIP_U8((pu1_pred[row * pred_strd + col] + dc_value));
    112 
    113 }
    114 
    115 
    116 void ihevcd_itrans_recon_dc_chroma(UWORD8 *pu1_pred,
    117                                    UWORD8 *pu1_dst,
    118                                    WORD32 pred_strd,
    119                                    WORD32 dst_strd,
    120                                    WORD32 log2_trans_size,
    121                                    WORD16 i2_coeff_value)
    122 {
    123     WORD32 row, col;
    124     WORD32 add, shift;
    125     WORD32 dc_value, quant_out;
    126     WORD32 trans_size;
    127 
    128 
    129     trans_size = (1 << log2_trans_size);
    130 
    131     quant_out = i2_coeff_value;
    132 
    133     shift = IT_SHIFT_STAGE_1;
    134     add = 1 << (shift - 1);
    135     dc_value = CLIP_S16((quant_out * 64 + add) >> shift);
    136     shift = IT_SHIFT_STAGE_2;
    137     add = 1 << (shift - 1);
    138     dc_value = CLIP_S16((dc_value * 64 + add) >> shift);
    139 
    140     for(row = 0; row < trans_size; row++)
    141         for(col = 0; col < trans_size; col++)
    142             pu1_dst[row * dst_strd + (col << 1)] = CLIP_U8((pu1_pred[row * pred_strd + (col << 1)] + dc_value));
    143 
    144 }
    145 
    146 
    147