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if(!HK::PlayM4_SetDecCallBack(*nPort, DecCBFun))
{
TRACE("PlayM4_SetDecCallBack err");
return;
}
void CALLBACK DecCBFun(long nPort, char * pBuf, long nSize, HK::FRAME_INFO * pFrameInfo, long nReserved1, long nReserved2)
{
printf("call g_DecCBFun suceess.\n");
printf("nPort=%d,nSize=%d,pFrameInfo.nWidth=%ld,pFrameInfo.nHeight=%ld,pFrameInfo.nStamp=%ld,pFrameInfo.nType=%ld,pFrameInfo.nFrameRate=%ld.\n",
nPort,nSize,pFrameInfo->nWidth,pFrameInfo->nHeight,
pFrameInfo->nStamp,pFrameInfo->nType,pFrameInfo->nFrameRate);
}
bool YV12_to_RGB24(unsigned char* pYV12, unsigned char* pRGB24, int iWidth, int iHeight)
{
if(!pYV12 || !pRGB24)
return false;
const long nYLen = long(iHeight * iWidth);
const int nHfWidth = (iWidth>>1);
if(nYLen<1 || nHfWidth<1)
return false;
// yv12数据格式,其中Y分量长度为width * height, U和V分量长度都为width * height / 4
// |WIDTH |
// y......y--------
// y......y HEIGHT
// y......y
// y......y--------
// v..v
// v..v
// u..u
// u..u
unsigned char* yData = pYV12;
unsigned char* vData = &yData[nYLen];
unsigned char* uData = &vData[nYLen>>2];
if(!uData || !vData)
return false;
// Convert YV12 to RGB24
//
// formula
// [1 1 1 ]
// [r g b] = [y u-128 v-128] [0 0.34375 0 ]
// [1.375 0.703125 1.734375]
// another formula
// [1 1 1 ]
// [r g b] = [y u-128 v-128] [0 0.698001 0 ]
// [1.370705 0.703125 1.732446]
int rgb[3];
int i, j, m, n, x, y;
m = -iWidth;
n = -nHfWidth;
for(y=0; y < iHeight; y++)
{
m += iWidth;
if(!(y % 2))
n += nHfWidth;
for(x=0; x < iWidth; x++)
{
i = m + x;
j = n + (x>>1);
rgb[2] = int(yData[i] + 1.370705 * (vData[j] - 128)); // r分量值
rgb[1] = int(yData[i] - 0.698001 * (uData[j] - 128) - 0.703125 * (vData[j] - 128)); // g分量值
rgb[0] = int(yData[i] + 1.732446 * (uData[j] - 128)); // b分量值
j = nYLen - iWidth - m + x;
i = (j<<1) + j;
for(j=0; j<3; j++)
{
if(rgb[j]>=0 && rgb[j]<=255)
pRGB24[i + j] = rgb[j];
else
pRGB24[i + j] = (rgb[j] < 0) ? 0 : 255;
}
}
}
return true;
}