int ff_sse16_armv6(MpegEncContext *s, uint8_t *blk1, uint8_t *blk2, ptrdiff_t stride, int h)
int ff_pix_abs16_armv6(MpegEncContext *s, uint8_t *blk1, uint8_t *blk2, ptrdiff_t stride, int h)
int ff_pix_abs8_armv6(MpegEncContext *s, uint8_t *blk1, uint8_t *blk2, ptrdiff_t stride, int h)
main external API structure.