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back2root:reverse-engineering:planet-x3:part4-audio-engine
Planet X3 - Part 4 - Audio Engine - WIP
Planet X3 utilise un segment spécifique pour la gestion sonore (via le speaker) et musicale.
| Offset | Taille | Infos | Description |
|---|---|---|---|
| 0x0000 | word | Number of active Channel(s) | |
| 0x0002 | word | Temporary variables for PC Speaker State | |
| 0x0004 | word | PC Speaker Enable | |
| 0x0006 | word | Audio System enable flag | |
| 0x0008 | word | pointer to CS:DriverInit | |
| 0x000A | word | pointer to CS:DriverShutdown | |
| 0x000C | word | pointer to CS:DriverUpdate | |
| 0x000E | word | pointer to CS:DriverAdlibWrite | |
| 0x0010 | word | Pointer to CS:DriverOPL2LPT Port address | |
| 0x0012 | word | extra variables, shared between channels | |
| 0x0016 | word | voice song pointer ? | |
| 0x001A | word | ||
| : | : | ||
| 0x001F | byte | ||
| : | : | ||
| 0x0022 | 16 bytes | Voice 0 | Sound Effect |
| 0x0032 | 16 bytes | Voice 1 | music |
| 0x0042 | 16 bytes | Voice 2 | music |
| 0x0052 | 16 bytes | Voice 3 | music |
| 0x0062 | 16 bytes | Voice 4 | music |
| 0x0072 | 16 bytes | Voice 5 | music adLib |
| 0x0082 | 16 bytes | Voice 6 | music adLib |
| 0x00CA | word | Music data max size: 0x8000 | |
| : | |||
| 0x8001 | byte | SFX data max size: 0x4000 | |
| 0x8002 | byte | ||
| : | : |
Voice x details
| offset | size | Description |
|---|---|---|
| 0 | byte | wait |
| +1 | byte | volume |
| +2 | word | ret |
| +4 | word | ptr |
| +6 | word | loop |
| +8 | word | pitch 1 |
| +A | word | pitch 2 |
| +C | byte | previous volume |
| +D | byte | priority |
| +E | word | Previous Reference |
Music Format
start offset in ram
| Offset | size | Description |
|---|---|---|
| 0 | byte | Music targeted device (0: speaker, 1: tandy, 2: adLib) |
| 1 | byte | number [N] of voice/stream 4 for speaker & Tandy, 6 for adlib |
| 2 | word | Pointer to first Stream (relative to begining of the song data) |
| 4 | word | Pointer to second Stream (relative to begining of the song data) |
| 6..n | word | Pointer to ..[N] Stream (relative to begining of the song data) |
| xx | - | stream data |
back2root/reverse-engineering/planet-x3/part4-audio-engine.txt · Dernière modification : 2023/02/15 22:51 de frater
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