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      1 /*
      2  * Copyright (C) 2007-2008 ARM Limited
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  *
     16  */
     17 /* ----------------------------------------------------------------
     18  *
     19  *
     20  * File Name:  omxVCM4P10_TransformDequantLumaDCFromPair.c
     21  * OpenMAX DL: v1.0.2
     22  * Revision:   9641
     23  * Date:       Thursday, February 7, 2008
     24  *
     25  *
     26  *
     27  *
     28  * H.264 inverse quantize and transform module
     29  *
     30  */
     31 
     32 #include "omxtypes.h"
     33 #include "armOMX.h"
     34 #include "omxVC.h"
     35 
     36 #include "armCOMM.h"
     37 #include "armVC.h"
     38 
     39 /*
     40  * Description:
     41  * Dequantize Luma DC block
     42  */
     43 
     44 static void DequantLumaDC4x4(
     45      OMX_S16* pDst,
     46      OMX_INT QP
     47 )
     48 {
     49     int Shift = (QP/6)-2 ;
     50     int Scale = armVCM4P10_VMatrix[QP%6][0];
     51     int i, Round, Value;
     52 
     53     if (Shift >= 0)
     54     {
     55         for (i=0; i<16; i++)
     56         {
     57             Value = (pDst[i] * Scale) << Shift;
     58             pDst[i] = (OMX_S16)Value;
     59         }
     60     }
     61     else
     62     {
     63         Shift = -Shift;;
     64         Round = 1<<(Shift-1);
     65 
     66         for (i=0; i<16; i++)
     67         {
     68             Value = (pDst[i] * Scale + Round) >> Shift;
     69             pDst[i] = (OMX_S16)Value;
     70         }
     71     }
     72 }
     73 
     74 
     75 
     76 /*
     77  * Description:
     78  * Inverse Transform DC 4x4 Coefficients
     79  */
     80 static void InvTransformDC4x4(OMX_S16* pData)
     81 {
     82     int i;
     83 
     84     /* Transform rows */
     85     for (i=0; i<16; i+=4)
     86     {
     87         int c0 = pData[i+0];
     88         int c1 = pData[i+1];
     89         int c2 = pData[i+2];
     90         int c3 = pData[i+3];
     91         pData[i+0] = (OMX_S16)(c0+c1+c2+c3);
     92         pData[i+1] = (OMX_S16)(c0+c1-c2-c3);
     93         pData[i+2] = (OMX_S16)(c0-c1-c2+c3);
     94         pData[i+3] = (OMX_S16)(c0-c1+c2-c3);
     95     }
     96 
     97     /* Transform columns */
     98     for (i=0; i<4; i++)
     99     {
    100         int c0 = pData[i+0];
    101         int c1 = pData[i+4];
    102         int c2 = pData[i+8];
    103         int c3 = pData[i+12];
    104         pData[i+0] = (OMX_S16)(c0+c1+c2+c3);
    105         pData[i+4] = (OMX_S16)(c0+c1-c2-c3);
    106         pData[i+8] = (OMX_S16)(c0-c1-c2+c3);
    107         pData[i+12] = (OMX_S16)(c0-c1+c2-c3);
    108     }
    109 }
    110 
    111 
    112 /**
    113  * Function:  omxVCM4P10_TransformDequantLumaDCFromPair   (6.3.4.2.1)
    114  *
    115  * Description:
    116  * Reconstructs the 4x4 LumaDC block from the coefficient-position pair
    117  * buffer, performs integer inverse, and dequantization for 4x4 LumaDC
    118  * coefficients, and updates the pair buffer pointer to the next non-empty
    119  * block.
    120  *
    121  * Input Arguments:
    122  *
    123  *   ppSrc - Double pointer to residual coefficient-position pair buffer
    124  *            output by CALVC decoding
    125  *   QP - Quantization parameter QpY
    126  *
    127  * Output Arguments:
    128  *
    129  *   ppSrc - *ppSrc is updated to the start of next non empty block
    130  *   pDst - Pointer to the reconstructed 4x4 LumaDC coefficients buffer; must
    131  *            be aligned on a 8-byte boundary.
    132  *
    133  * Return Value:
    134  *    OMX_Sts_NoErr, if the function runs without error.
    135  *    OMX_Sts_BadArgErr - bad arguments: if one of the following cases occurs:
    136  *    -    ppSrc or pDst is NULL.
    137  *    -    pDst is not 8 byte aligned.
    138  *    -    QP is not in the range of [0-51].
    139  *
    140  */
    141 
    142 OMXResult omxVCM4P10_TransformDequantLumaDCFromPair(
    143      const OMX_U8 **ppSrc,
    144      OMX_S16* pDst,
    145      OMX_INT QP
    146  )
    147 {
    148     armRetArgErrIf(ppSrc  == NULL,           OMX_Sts_BadArgErr);
    149     armRetArgErrIf(*ppSrc == NULL,           OMX_Sts_BadArgErr);
    150     armRetArgErrIf(pDst   == NULL,           OMX_Sts_BadArgErr);
    151     armRetArgErrIf(armNot8ByteAligned(pDst), OMX_Sts_BadArgErr);
    152     armRetArgErrIf(QP<0,                     OMX_Sts_BadArgErr);
    153     armRetArgErrIf(QP>51,                    OMX_Sts_BadArgErr);
    154 
    155     armVCM4P10_UnpackBlock4x4(ppSrc, pDst);
    156     /*InvTransformDequantLumaDC4x4(pDst, QP);*/
    157     InvTransformDC4x4(pDst);
    158     DequantLumaDC4x4(pDst, QP);
    159 
    160     return OMX_Sts_NoErr;
    161 }
    162 
    163 /* End of file */
    164