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SIMD/Uses/SAD: Difference between revisions
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The excerpts are part of a public-domain MPEG-1 video encoder and can be found in [https://github.com/maikmerten/mpeg/blob/master/me.c https://github.com/maikmerten/mpeg/blob/master/me.c], which contains all motion estimation routines. | The excerpts are part of a public-domain MPEG-1 video encoder and can be found in [https://github.com/maikmerten/mpeg/blob/master/me.c https://github.com/maikmerten/mpeg/blob/master/me.c], which contains all motion estimation routines. | ||
The following C code computes the SAD for 16 consecutive pixels (one line in a 16x16 block). The pointers "bptr" and "cptr" point to | The following C code computes the SAD for 16 consecutive pixels (one line in a 16x16 block). The pointers "bptr" and "cptr" point to pixel values (8 bit unsigned integers) in the current and a preceding frame. The variable "error", which is the accumulator for the SAD score, is initialized as zero. | ||
residue=(*(bptr++)-*(cptr++)); | residue=(*(bptr++)-*(cptr++)); | ||