原文地址：https://blog.51cto.com/cto521/1586190
int cut_yuv420P(uint8_t *pInBuf, int width, int height, uint8_t **pOutBuf, int new_x, int new_y, int new_width, int new_height)
{
if(NULL == pInBuf || 0 == width || 0 == height)
return -1;
int length = new_width* new_height* 3 / 2;
*pOutBuf = (uint8_t *)malloc(length);
if (NULL == *pOutBuf)
{
printf("malloc new size memory failed! size=%d\n", length);
return -1;
}
memset(*pOutBuf , 0, length);
uint8_t *pUBuf = *pOutBuf + new_width * new_height;
uint8_t *pVBuf = *pOutBuf +new_width * new_height * 5 / 4;
for(int x = 0; x < new_width; x++)
{
for (int y = 0; y < new_height; y++) //每个循环写一列
{
*(*pOutBuf + y * new_width + x) = *(pInBuf + (x + new_x) + width * (y + new_y)); //cope Y
int ret = (y + new_y)%2;
if (1 == (x + new_x)%2 && 1 == (y + new_y)%2)
{
long pix = width * height + (width>>1) * ((y + new_y)>>1) + (((x + new_x))>>1);
*(pUBuf + (new_width/2)*(y/2) + x/2) = *(pInBuf + pix); //cope U
pix += width * height / 4;
*(pVBuf + (new_width/2)*(y/2) + x/2) = *(pInBuf + pix); //cope V
}
}
}
return 0;
}
