NV12转IYUV

转化函数摘自http://www.xue5.com/Mobile/Mobile/647330.html

太难找了，学习记录一下。

看YV12和IYUV的存储结构，http://www.webartz.com/fourcc/indexyuv.htm 。YV12与IYUV类似，更换UV分量即可。

int ConvertNV12toIYUV(Uint8* pbuf,Uint32 imgw,Uint32 imgh)
{
Uint8* pPU = NULL;
Uint8* pPV = NULL;
Uint8* pPUV = NULL;
Uint8* pcache = NULL;
Uint32 i;

if (pbuf == NULL)
return -1;
pPUV = pbuf + imgw*imgh;
pcache = (Uint8*)malloc((imgw*imgh)>>1);
if (pcache == NULL)

return -1;
pPU = pcache;
pPV = pcache + ((imgw*imgh)>>2);
for (i=0;i<(imgw*imgh)>>1;i++)
{
if ((i % 2) == 0)
*pPV++ = *(pPUV+i);
else
*pPU++ = *(pPUV+i);
}
memcpy(pPUV,pcache,(imgw*imgh)>>1);
if (pcache)
free(pcache);
return 0;
}