#### User Operation Flags (Uops)

User operation flags appear at three different levels, there is one for the title in TT_SRPT (only Uop0 and Uop1, as bits 0 and 1 of Title Type), one for each Program Chain, and one in each VOBU in the PCI packet.
These flags are ORed together, a set bit in any mask inhibits the associated control.

number | controls affected | PGC | VOBU
--- | --- | --- | ---
0 | Time play or search |  |
1 | PTT play or search |  |
2 | Title play |  |
3 | Stop |  |
4 | GoUp |  |
5 | Time or PTT search |  |
6 | TopPG or PrevPG search |  |
7 | NextPG search |  |
8 | Forward scan |  |
9 | Backward scan |  |
10 | Menu call - Title |  |
11 | Menu call - Root |  |
12 | Menu call - Subpicture |  |
13 | Menu call - Audio |  |
14 | Menu call - Angle |  |
15 | Menu call - PTT |  |
16 | Resume |  |
17 | Button select or activate |  |
18 | Still off |  |
19 | Pause on |  |
20 | Audio stream change |  |
21 | Subpicture stream change |  |
22 | Angle change |  |
23 | Karaoke audio mix change |  |
24 | Video presentation mode change |  |

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