ref: 063709c92e8bafe467d384f564afbdc6b66eb39a
dir: /codec/decoder/core/src/decode_mb_aux.cpp/
/*!
* \copy
* Copyright (c) 2013, Cisco Systems
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <string.h>
#include "decode_mb_aux.h"
#include "wels_common_basis.h"
namespace WelsDec {
#define MAX_NEG_CROP 1024
uint8_t g_ClipTable[256 + 2 * MAX_NEG_CROP]; //the front 1024 is 0, the back 1024 is 255, the middle 256 elements is 0-255
/* init pClip table to pClip the final dct data */
void_t InitDctClipTable(void_t)
{
uint8_t *p = &g_ClipTable[0];
const int32_t kiLength = MAX_NEG_CROP * sizeof(uint8_t);
int32_t i = 0;
do
{
const int32_t kiIdx = MAX_NEG_CROP + i;
p[kiIdx] = i;
p[1+kiIdx] = 1+i;
p[2+kiIdx] = 2+i;
p[3+kiIdx] = 3+i;
i += 4;
} while(i < 256);
memset( p, 0, kiLength);
memset( p + MAX_NEG_CROP + 256, 0xFF, kiLength);
}
//NOTE::: p_RS should NOT be modified and it will lead to mismatch with JSVM.
// so should allocate kA array to store the temporary value (idct).
void_t IdctResAddPred_c(uint8_t *pPred, const int32_t kiStride, int16_t *pRs)
{
int16_t iSrc[16];
uint8_t *pDst = pPred;
const int32_t kiStride2 = kiStride<<1;
const int32_t kiStride3 = kiStride + kiStride2;
uint8_t *pClip = &g_ClipTable[MAX_NEG_CROP];
int32_t i;
for(i=0; i<4; i++)
{
const int32_t kiY = i<<2;
const int32_t kiT0 = pRs[kiY] + pRs[kiY+2];
const int32_t kiT1 = pRs[kiY] - pRs[kiY+2];
const int32_t kiT2 = (pRs[kiY+1]>>1) - pRs[kiY+3];
const int32_t kiT3 = pRs[kiY+1] + (pRs[kiY+3]>>1);
iSrc[kiY] = kiT0 + kiT3;
iSrc[kiY+1] = kiT1 + kiT2;
iSrc[kiY+2] = kiT1 - kiT2;
iSrc[kiY+3] = kiT0 - kiT3;
}
for(i=0; i<4; i++)
{
int32_t kT1 = iSrc[i] + iSrc[i+8];
int32_t kT2 = iSrc[i+4] + (iSrc[i+12]>>1);
int32_t kT3 = (32 + kT1 + kT2) >> 6;
int32_t kT4 = (32 + kT1 - kT2) >> 6;
pDst[i] = pClip[ kT3 + pPred[i] ];
pDst[i+kiStride3] = pClip[ kT4 + pPred[i+kiStride3] ];
kT1 = iSrc[i] - iSrc[i+8];
kT2 = (iSrc[i+4]>>1) - iSrc[i+12];
pDst[i+kiStride] = pClip[ ((32 + kT1 + kT2) >> 6) + pDst[i+kiStride] ];
pDst[i+kiStride2] = pClip[ ((32 + kT1 - kT2) >> 6) + pDst[i+kiStride2] ];
}
}
void_t GetI4LumaIChromaAddrTable(int32_t *pBlockOffset, const int32_t kiYStride, const int32_t kiUVStride)
{
int32_t *pOffset = pBlockOffset;
int32_t i;
const uint8_t kuiScan0 = g_kuiScan8[0];
for(i=0; i<16; i++)
{
const uint32_t kuiA = g_kuiScan8[i] - kuiScan0;
const uint32_t kuiX = kuiA & 0x07;
const uint32_t kuiY = kuiA >> 3;
pOffset[i]= (kuiX + kiYStride* kuiY) << 2;
}
for(i=0; i<4; i++)
{
const uint32_t kuiA = g_kuiScan8[i] - kuiScan0;
pOffset[16+i]=
pOffset[20+i]= ((kuiA & 0x07) + (kiUVStride/*>>1*/) * (kuiA >> 3)) << 2;
}
}
} // namespace WelsDec