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内存搬移加黑边问题的讨论
想把1080P的图像叠加到 2120*1280 的全黑图像的缓存中,Y分量搬移成功,但是UV分量的偏移起始地址这个怎么算啊,数据是YUV420P ,UV12求大神指导UV分量怎么算
int IMAGE::AddBorders(int ImgType, IMAGE image)
{
if(image.dwImgWidth
{
return ERROR_OUT_PARAM;
}
FILE* fp;
FILE* fout;
char *ImageDatabuf ;
char *pbufyuv;
int pbufoffset;
ImageDatabuf = (char*)malloc(image.dwScrImgHeight * image.dwScrImgWidth * 3/2);
pbufyuv = (char*)malloc(image.dwImgWidth *image.dwImgHeight * 3/2);
fp = fopen("E://File/1920_1080_chushi30_nv12.yuv","rb+");
if(ImgType == IMG_YUV_P)
{
fout = fopen("E://File/out_p.yuv","wb+");
}
else
{
fout = fopen("E://File/out_sp.yuv","wb+");
}
mW_offset = (image.dwImgWidth - image.dwScrImgWidth)/2 ;
mH_offset = (image.dwImgHeight - image.dwScrImgHeight)/2;
//背景置黑色
memset(pbufyuv, BLOCK_Y, image.dwImgHeight * image.dwImgWidth * 3/2);
memset(pbufyuv+image.dwImgHeight * image.dwImgWidth, BLOCK_UV, image.dwImgHeight * image.dwImgWidth*1/2);
//先拷贝Y
pbufoffset = mW_offset + (mH_offset * image.dwImgWidth);
for(int line =1; line <= image.dwScrImgHeight; line++)
{
fread(ImageDatabuf, 1,image.dwScrImgWidth, fp);
memcpy(pbufyuv + pbufoffset, ImageDatabuf,image.dwScrImgWidth);
if(line != image.dwScrImgHeight)
{
pbufoffset = pbufoffset + image.dwImgWidth;
}
memset(ImageDatabuf, 0, image.dwScrImgWidth);
}
if(ImgType == IMG_YUV_P)
{
pbufoffset = pbufoffset + image.dwImgWidth /2 - (mW_offset/2 + mH_offset*image.dwImgWidth/2);
for(int Luv = 1;Luv <= image.dwScrImgHeight; Luv++)
{
fread(ImageDatabuf, 1,image.dwScrImgWidth/2, fp);
//拷贝数据
memcpy(pbufyuv+pbufoffset, ImageDatabuf,image.dwScrImgWidth/2);
if(Luv != image.dwScrImgHeight)
{
pbufoffset= pbufoffset+ image.dwImgWidth/2;
}
memset(ImageDatabuf, 0, image.dwScrImgWidth/2);
}
}
int s32ret = fwrite(pbufyuv ,1,image.dwImgHeight * image.dwImgWidth * 3/2, fout);
if(s32ret >0)
{
fclose(fout);
fclose(fp);
}
}
int IMAGE::AddBorders(int ImgType, IMAGE image)
{
if(image.dwImgWidth
return ERROR_OUT_PARAM;
}
FILE* fp;
FILE* fout;
char *ImageDatabuf ;
char *pbufyuv;
int pbufoffset;
ImageDatabuf = (char*)malloc(image.dwScrImgHeight * image.dwScrImgWidth * 3/2);
pbufyuv = (char*)malloc(image.dwImgWidth *image.dwImgHeight * 3/2);
fp = fopen("E://File/1920_1080_chushi30_nv12.yuv","rb+");
if(ImgType == IMG_YUV_P)
{
fout = fopen("E://File/out_p.yuv","wb+");
}
else
{
fout = fopen("E://File/out_sp.yuv","wb+");
}
mW_offset = (image.dwImgWidth - image.dwScrImgWidth)/2 ;
mH_offset = (image.dwImgHeight - image.dwScrImgHeight)/2;
//背景置黑色
memset(pbufyuv, BLOCK_Y, image.dwImgHeight * image.dwImgWidth * 3/2);
memset(pbufyuv+image.dwImgHeight * image.dwImgWidth, BLOCK_UV, image.dwImgHeight * image.dwImgWidth*1/2);
//先拷贝Y
pbufoffset = mW_offset + (mH_offset * image.dwImgWidth);
for(int line =1; line <= image.dwScrImgHeight; line++)
{
fread(ImageDatabuf, 1,image.dwScrImgWidth, fp);
memcpy(pbufyuv + pbufoffset, ImageDatabuf,image.dwScrImgWidth);
if(line != image.dwScrImgHeight)
{
pbufoffset = pbufoffset + image.dwImgWidth;
}
memset(ImageDatabuf, 0, image.dwScrImgWidth);
}
if(ImgType == IMG_YUV_P)
{
pbufoffset = pbufoffset + image.dwImgWidth /2 - (mW_offset/2 + mH_offset*image.dwImgWidth/2);
for(int Luv = 1;Luv <= image.dwScrImgHeight; Luv++)
{
fread(ImageDatabuf, 1,image.dwScrImgWidth/2, fp);
//拷贝数据
memcpy(pbufyuv+pbufoffset, ImageDatabuf,image.dwScrImgWidth/2);
if(Luv != image.dwScrImgHeight)
{
pbufoffset= pbufoffset+ image.dwImgWidth/2;
}
memset(ImageDatabuf, 0, image.dwScrImgWidth/2);
}
}
int s32ret = fwrite(pbufyuv ,1,image.dwImgHeight * image.dwImgWidth * 3/2, fout);
if(s32ret >0)
{
fclose(fout);
fclose(fp);
}
}
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