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OBD:SNDD: Difference between revisions

OBD Discussion

OBD:SNDD (view source)

Revision as of 00:42, 28 November 2022

331 bytes added ,  28 November 2022
m
→‎PS2 implementation
(note on how/where SNDDs are stored for PS2 data)
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(Yes, the PS2 retail level0_Final.dat only has those five sounds. All the other sounds (weapons, particles, impacts, footsteps, etc) are stored per-chapter, which causes a lot of duplicates but supposedly lightens the memory usage for a given level.)
(Yes, the PS2 retail level0_Final.dat only has those five sounds. All the other sounds (weapons, particles, impacts, footsteps, etc) are stored per-chapter, which causes a lot of duplicates but supposedly lightens the memory usage for a given level.)


As you can see, so far this is quite similar to the PC demo and Mac SNDDs described above (and the SNDD template checksum is indeed the same for PC demo, Mac and PS2, implying that the data structure in the .dat is the same).
The layout is similar to the PC demo and Mac SNDDs described above - and indeed the SNDD template checksum is indeed the same for PC demo, Mac and PS2, implying that the data structure in the .dat is the same. However, there are two major novelties/anomalies (apart from the all the music being mono), emphasized above with '''''bold italic'''''. First, the five .raw offsets at the end of each SNDD are obviously not pointers into level0_Final.raw or level0_Final.sep (the .raw's size is 4 MB, the .sep's 6MB, and the pointers are in the 311 MB range, possibly pointing into a memory region where the sounds will be stored at runtime). Second, the 2-byte padding field between the duration and the .raw storage size is obviously not blank here; rather, it is an index into a file called SOUNDS\LEVEL0\SOUND.DAT, which looks like this:
 
However, there are major novelties/anomalies (apart from the all the music being mono). First, the five .raw offsets at the end of each SNDD are obviously not pointers into level0_Final.raw or level0_Final.sep (the .raw's size is 4 MB, the .sep's 6MB, and the pointers are in the 311 MB range, possibly pointing into a memory region where the sounds will be stored at runtime). Second, the 2-byte padding field between the duration and the .raw storage size is obviously not blank here; rather, it is an index into a file called SOUNDS\LEVEL0\SOUND.DAT, which looks like this:
  0x00: '''''00 00 20 F7 00 00 00 00 00 00''''' 01 00 A0 F6 00 00
  0x00: '''''00 00 20 F7 00 00 00 00 00 00''''' 01 00 A0 F6 00 00
  0x10: 20 F7 00 00 '''''02 00 40 86 01 00 C0 ED 01 00''''' 03 00
  0x10: 20 F7 00 00 '''''02 00 40 86 01 00 C0 ED 01 00''''' 03 00
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For all the levels other than LEVEL0 (i.e., game chapters), the file SOUNDS\LEVEL#\SOUND.RAW is about 1 MB in size and has some non-trivial sound data. (Looks like an assembly of complete VAG sounds, with headers.) However, this data doesn't seem to be referenced from SOUNDS\LEVEL#\SOUND.DAT, which only points to the much larger SOUNDS\LEVEL#\SOUND.SEP (thus the purpose of SOUNDS\LEVEL#\SOUND.RAW is currently not clear).
For all the levels other than LEVEL0 (i.e., game chapters), the file SOUNDS\LEVEL#\SOUND.RAW is about 1 MB in size and has some non-trivial sound data. (Looks like an assembly of complete VAG sounds, with headers.) However, this data doesn't seem to be referenced from SOUNDS\LEVEL#\SOUND.DAT, which only points to the much larger SOUNDS\LEVEL#\SOUND.SEP (thus the purpose of SOUNDS\LEVEL#\SOUND.RAW is currently not clear).


==Exporting and importing tips==
==Exporting and importing tips==
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