CD_ReadUserData (changes)
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CDFSDriver
» SWI Calls
» CD_ReadSubChannel
CD_ReadSubChannel
(SWI &4124F)
| Entry | |
|---|---|
| R0 | &40 |
| R1 | Pointer to subchannel block |
| R7 | Pointer to |
| Exit | |
|---|---|
| R0 | Preserved |
| R1 | Preserved |
| R7 | Preserved |
Subchannel Block
| Offset | Contents |
|---|---|
| 0 | LBA address of current head position relative to track start |
| 4 | Absolute LBA address |
| 8 | Audio flags: |
| Bit 0 : 0 = Audio, 1 = data | |
| Bit 1: 0 = 4 channels, 1 = 2 channels | |
| 9 | Track number |
| 10 | Index number |
Use
The purpose of this call is to return subchannel information encoded in the CD.
Notes
None.
See also
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