Safeguarding the past, present and future of RISC OS for everyone
Sound Channel Control Block (changes)
Showing changes from revision #1 to #2:
Added | Removed | Changed
Programmer's SoundDMA Reference Manuals
» Part 15 – SWI Calls
» Sound Sound_Configure
» Sound_Configure Sound Channel Handler
» Sound Channel Handler
Sound Channel Control Block (SCCB)
| Offset | Contents |
|---|---|
| +0 | gate bit + channel amplitude (7-bit log) |
| +1 | index to voice table |
| +2 | instance number for attached voice |
| +3 | control/status bit flags |
| +4 | phase accumulator pitch oscillator |
| +8 | phase accumulator timbre oscillator |
| +12 | number of buffer fills left to do (counter) |
| +16 | (normally working R4) |
| +20 | (normally working R5) |
| +24 | (normally working R6) |
| +28 | (normally working R7) |
| +32 | (normally working R8) |
| +36-63 | reserved |
| +64-255 | available for users |
The control/status flag byte indicates the state of the voice attached to the channel and may be used for allocating voices in a polyphonic manner.
See also
Social
Follow us on
and
and
ROOL Store
Buy RISC OS Open merchandise here, including SD cards for Raspberry Pi and more.