QCIF is a raw collection of pixels composed of what are called luma, cb, cr in the following array format.A luma frame is composed of 176×144 luma samples, followed by 88×72 cb samples followed by 88×72 cr samples. Reference
unsigned char luma[176][144];
unsigned char cb[88][72];
unsigned char cr[88][72];
Here you can find code that is used to read qcif file format.
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solved How can i extract a yuv frame from given yuv 4:2:0 file [closed]