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/* ----------------------------------------------------------------
*
*
* File Name: omxVCM4P10_PredictIntraChroma_8x8.c
* OpenMAX DL: v1.0.2
* Revision: 9641
* Date: Thursday, February 7, 2008
*
* (c) Copyright 2007-2008 ARM Limited. All Rights Reserved.
*
*
*
* H.264 Chroma 8x8 intra prediction module
*
*/
#include "omxtypes.h"
#include "armOMX.h"
#include "omxVC.h"
#include "armCOMM.h"
#include "armVC.h"
/*
* Description:
* Perform DC style intra prediction, upper block has priority
*
* Parameters:
* [in] pSrcLeft Pointer to the buffer of 16 left coefficients:
* p[x, y] (x = -1, y = 0..3)
* [in] pSrcAbove Pointer to the buffer of 16 above coefficients:
* p[x,y] (x = 0..3, y = -1)
* [in] leftStep Step of left coefficient buffer
* [in] dstStep Step of the destination buffer
* [in] availability Neighboring 16x16 MB availability flag
* [out] pDst Pointer to the destination buffer
*
* Return Value:
* None
*/
static void armVCM4P10_PredictIntraDCUp4x4(
const OMX_U8* pSrcLeft,
const OMX_U8 *pSrcAbove,
OMX_U8* pDst,
OMX_INT leftStep,
OMX_INT dstStep,
OMX_S32 availability
)
{
int x, y, Sum=0, Count = 0;
if (availability & OMX_VC_UPPER)
{
for (x=0; x<4; x++)
{
Sum += pSrcAbove[x];
}
Count++;
}
else if (availability & OMX_VC_LEFT)
{
for (y=0; y<4; y++)
{
Sum += pSrcLeft[y*leftStep];
}
Count++;
}
if (Count==0)
{
Sum = 128;
}
else
{
Sum = (Sum + 2) >> 2;
}
for (y=0; y<4; y++)
{
for (x=0; x<4; x++)
{
pDst[y*dstStep+x] = (OMX_U8)Sum;
}
}
}
/*
* Description:
* Perform DC style intra prediction, left block has priority
*
* Parameters:
* [in] pSrcLeft Pointer to the buffer of 16 left coefficients:
* p[x, y] (x = -1, y = 0..3)
* [in] pSrcAbove Pointer to the buffer of 16 above coefficients:
* p[x,y] (x = 0..3, y = -1)
* [in] leftStep Step of left coefficient buffer
* [in] dstStep Step of the destination buffer
* [in] availability Neighboring 16x16 MB availability flag
* [out] pDst Pointer to the destination buffer
*
* Return Value:
* None
*/
static void armVCM4P10_PredictIntraDCLeft4x4(
const OMX_U8* pSrcLeft,
const OMX_U8 *pSrcAbove,
OMX_U8* pDst,
OMX_INT leftStep,
OMX_INT dstStep,
OMX_S32 availability
)
{
int x, y, Sum=0, Count = 0;
if (availability & OMX_VC_LEFT)
{
for (y=0; y<4; y++)
{
Sum += pSrcLeft[y*leftStep];
}
Count++;
}
else if (availability & OMX_VC_UPPER)
{
for (x=0; x<4; x++)
{
Sum += pSrcAbove[x];
}
Count++;
}
if (Count==0)
{
Sum = 128;
}
else
{
Sum = (Sum + 2) >> 2;
}
for (y=0; y<4; y++)
{
for (x=0; x<4; x++)
{
pDst[y*dstStep+x] = (OMX_U8)Sum;
}
}
}
/**
* Function: omxVCM4P10_PredictIntraChroma_8x8 (6.3.3.1.3)
*
* Description:
* Performs intra prediction for chroma samples.
*
* Input Arguments:
*
* pSrcLeft - Pointer to the buffer of 8 left pixels: p[x, y] (x = -1, y=
* 0..7).
* pSrcAbove - Pointer to the buffer of 8 above pixels: p[x,y] (x = 0..7, y
* = -1); must be aligned on an 8-byte boundary.
* pSrcAboveLeft - Pointer to the above left pixels: p[x,y] (x = -1, y = -1)
* leftStep - Step of left pixel buffer; must be a multiple of 8.
* dstStep - Step of the destination buffer; must be a multiple of 8.
* predMode - Intra chroma prediction mode, please refer to section 3.4.3.
* availability - Neighboring chroma block availability flag, please refer
* to "Neighboring Macroblock Availability".
*
* Output Arguments:
*
* pDst - Pointer to the destination buffer; must be aligned on an 8-byte
* boundary.
*
* Return Value:
* If the function runs without error, it returns OMX_Sts_NoErr.
* If any of the following cases occurs, the function returns
* OMX_Sts_BadArgErr:
* pDst is NULL.
* dstStep < 8 or dstStep is not a multiple of 8.
* leftStep is not a multiple of 8.
* predMode is not in the valid range of enumeration
* OMXVCM4P10IntraChromaPredMode.
* predMode is OMX_VC_CHROMA_VERT, but availability doesn't set
* OMX_VC_UPPER indicating p[x,-1] (x = 0..7) is not available.
* predMode is OMX_VC_CHROMA_HOR, but availability doesn't set OMX_VC_LEFT
* indicating p[-1,y] (y = 0..7) is not available.
* predMode is OMX_VC_CHROMA_PLANE, but availability doesn't set
* OMX_VC_UPPER_LEFT or OMX_VC_UPPER or OMX_VC_LEFT indicating
* p[x,-1](x = 0..7), or p[-1,y] (y = 0..7), or p[-1,-1] is not
* available.
* availability sets OMX_VC_UPPER, but pSrcAbove is NULL.
* availability sets OMX_VC_LEFT, but pSrcLeft is NULL.
* availability sets OMX_VC_UPPER_LEFT, but pSrcAboveLeft is NULL.
* either pSrcAbove or pDst is not aligned on a 8-byte boundary. Note:
* pSrcAbove, pSrcAbove, pSrcAboveLeft may be invalid pointer if
* they are not used by intra prediction implied in predMode.
* Note: OMX_VC_UPPER_RIGHT is not used in intra chroma
* prediction.
*
*/
OMXResult omxVCM4P10_PredictIntraChroma_8x8(
const OMX_U8* pSrcLeft,
const OMX_U8 *pSrcAbove,
const OMX_U8 *pSrcAboveLeft,
OMX_U8* pDst,
OMX_INT leftStep,
OMX_INT dstStep,
OMXVCM4P10IntraChromaPredMode predMode,
OMX_S32 availability
)
{
int x, y, Sum;
int H, V, a, b, c;
armRetArgErrIf(pDst == NULL, OMX_Sts_BadArgErr);
armRetArgErrIf(dstStep < 8, OMX_Sts_BadArgErr);
armRetArgErrIf((dstStep % 8) != 0, OMX_Sts_BadArgErr);
armRetArgErrIf((leftStep % 8) != 0, OMX_Sts_BadArgErr);
armRetArgErrIf(armNot8ByteAligned(pSrcAbove), OMX_Sts_BadArgErr);
armRetArgErrIf(armNot8ByteAligned(pDst), OMX_Sts_BadArgErr);
armRetArgErrIf((availability & OMX_VC_UPPER) && pSrcAbove == NULL, OMX_Sts_BadArgErr);
armRetArgErrIf((availability & OMX_VC_LEFT ) && pSrcLeft == NULL, OMX_Sts_BadArgErr);
armRetArgErrIf((availability & OMX_VC_UPPER_LEFT) && pSrcAboveLeft == NULL, OMX_Sts_BadArgErr);
armRetArgErrIf(predMode==OMX_VC_CHROMA_VERT && !(availability & OMX_VC_UPPER), OMX_Sts_BadArgErr);
armRetArgErrIf(predMode==OMX_VC_CHROMA_HOR && !(availability & OMX_VC_LEFT), OMX_Sts_BadArgErr);
armRetArgErrIf(predMode==OMX_VC_CHROMA_PLANE && !(availability & OMX_VC_UPPER), OMX_Sts_BadArgErr);
armRetArgErrIf(predMode==OMX_VC_CHROMA_PLANE && !(availability & OMX_VC_UPPER_LEFT), OMX_Sts_BadArgErr);
armRetArgErrIf(predMode==OMX_VC_CHROMA_PLANE && !(availability & OMX_VC_LEFT), OMX_Sts_BadArgErr);
armRetArgErrIf((unsigned)predMode > OMX_VC_CHROMA_PLANE, OMX_Sts_BadArgErr);
switch (predMode)
{
case OMX_VC_CHROMA_DC:
armVCM4P10_PredictIntraDC4x4( pSrcLeft, pSrcAbove, pDst, leftStep, dstStep, availability);
armVCM4P10_PredictIntraDCUp4x4( pSrcLeft, pSrcAbove+4, pDst+4, leftStep, dstStep, availability);
armVCM4P10_PredictIntraDCLeft4x4( pSrcLeft+4*leftStep, pSrcAbove, pDst+4*dstStep, leftStep, dstStep, availability);
armVCM4P10_PredictIntraDC4x4( pSrcLeft+4*leftStep, pSrcAbove+4, pDst+4+4*dstStep, leftStep, dstStep, availability);
break;
case OMX_VC_CHROMA_HOR:
for (y=0; y<8; y++)
{
for (x=0; x<8; x++)
{
pDst[y*dstStep+x] = pSrcLeft[y*leftStep];
}
}
break;
case OMX_VC_CHROMA_VERT:
for (y=0; y<8; y++)
{
for (x=0; x<8; x++)
{
pDst[y*dstStep+x] = pSrcAbove[x];
}
}
break;
case OMX_VC_CHROMA_PLANE:
H = 4*(pSrcAbove[7] - pSrcAboveLeft[0]);
for (x=2; x>=0; x--)
{
H += (x+1)*(pSrcAbove[4+x] - pSrcAbove[2-x]);
}
V = 4*(pSrcLeft[7*leftStep] - pSrcAboveLeft[0]);
for (y=2; y>=0; y--)
{
V += (y+1)*(pSrcLeft[(4+y)*leftStep] - pSrcLeft[(2-y)*leftStep]);
}
a = 16*(pSrcAbove[7] + pSrcLeft[7*leftStep]);
b = (17*H+16)>>5;
c = (17*V+16)>>5;
for (y=0; y<8; y++)
{
for (x=0; x<8; x++)
{
Sum = (a + b*(x-3) + c*(y-3) + 16)>>5;
pDst[y*dstStep+x] = (OMX_U8)armClip(0,255,Sum);
}
}
break;
}
return OMX_Sts_NoErr;
}
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