YVU420PackedSemiPlanar32m4ka与YUV420PackedSemiPlanar64x32Tile2m8ka
YVU420PackedSemiPlanar32m4ka与YUV420PackedSemiPlanar64x32Tile2m8ka都是nv12变换来的。
* YVU420PackedSemiPlanar : Buffer containing all Y, and then V and U
* interleaved.
* YVU420PackedSemiPlanar32m4ka : YUV planar format, similar to the
* YVU420PackedSemiPlanar format, but with the
* following restrictions:
*
* 1. The width and height of both plane must
* be a multiple of 32 texels.
*
* 2. The base address of both planes must be
* aligned to a 4kB boundary.
*
* YUV420PackedSemiPlanar16m2ka : YUV planar format, similar to the
* YUV420PackedSemiPlanar format, but with the
* following restrictions:
*
* 1. The width of the luma plane must be a
* multiple of 16 pixels.
*
* 2. The address of both planes must be
* aligned to a 2kB boundary.
*
* YUV420PackedSemiPlanar64x32Tile2m8ka : YUV planar format, similar to the
* YUV420PackedSemiPlanar format, but with the
* following restrictions:
*
* 1. The data is laid out in a 4x2 MB tiling
* memory structure
*
* 2. The width of each plane is a multiple of
* 2 4x2 MB tiles.
*
* 3. The height of each plan is a multiple of
* a 4x2 MB tile.
*
* 4. The base address of both planes must be
* aligned to an 8kB boundary.
*
* 5. The tiles are scanned in the order
* defined in the MFCV5.1 User's Manual.
*/
YUV420PackedSemiPlanar64x32Tile2m8ka其实是V4L2_PIX_FMT_NV12MT(TM12)。
子块的内存布局为：
宽度需要与128倍数对齐，若模块竖向分辨率为奇数，则最后一行以线性布局。极限情况布局如下：
下面给出YVU420PackedSemiPlanar32m4ka转yv12的代码，以480x480为例：
void YUV420PackedSemiPlanar32mToYUV420(char* src,char* dst)
{
const int width =512;
const int height =480;
char* _yuv = dst;
char* _y = _yuv;
char* _u = _yuv + width*height;
char* _v = _u + width*height/4;
memset(_yuv, 0, width*height*3/2);
memcpy(_y,src,width*height);
char* pStart = src + width*height;
for (int i=0; i<height*width/4; i++) {
*_u++ = *pStart++;
*_v++ = *pStart++;
}
}
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