Graphical YV12 and NV12 and I420 chroma sampling formats

### Date: 2017/5/25

### Author: Soaringlee

I420：YUV420p, the planar format, is stored in three independent arrays in the memory, first the Y array, then the U array, and finally the V array. The physical pixel storage of I420 and the storage in the memory are shown in Figure 1 below;

YV12: YUV420p, the planar format, is stored in three independent arrays in memory, first the Y array, then the V array, and finally the U array. The difference with I420 is that the order of U component and V component in memory is different. as shown in picture 2;

Figure 1 Schematic diagram of I420 physical pixel storage and storage in memory

Figure 2 Schematic diagram of YV12 physical pixel storage and storage in memory

NV12：YUV420sp, semi-planar, and Y components are stored in a separate array, and U and V are interleaved in an array. Before U, V and after are NV12, and V before and U are NV21. The storage diagram of NV12 is shown in Figure 3.

Figure 3 Schematic diagram of NV12 physical pixel storage and storage in memory

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