surround_mode [ATSC Semantics]
The surround_mode is a 2-bit unsigned integer field in an ATSC AC-3 descriptor that gives the surround_mode of an AC-3 service.
valid surround_mode values
| surround_mode | Meaning |
| 0 / 0x00 | Not indicated |
| 1 / 0x01 | Not Dolby Surround encoded |
| 2 / 0x02 | Dolby Surround encoded |
|