OBD:SNDD: Difference between revisions

OBD:SNDD (view source)

Revision as of 09:23, 31 May 2020

1,008 bytes added , 31 May 2020

→‎PCM export: PC demo detection

Geyser

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-==PCM export==
+==PCM export and PC demo detection==
 OniSplit v0.9.### implements export to uncompressed PCM (signed 16-bit linear) from both the PC retail and the Mac SNDD format: use '''-extract:pcm''' instead of either '''-extract:wav''' or '''-extract:aif'''. As compared to ADPCM, linear PCM is a much more straightforward format (almost human readable), and makes it easier to analyze artifacts.
-Note, however, that transcoding (between IMA4 and MS ADPCM) and encoding is not implemented at this point. So '''-extract:aif''' will not work on PC SNDDs, '''-extract:wav''' will not work on Mac SNDDs, and '''-create''' will only work on sound files that use the correct codec and sample rate supported by the PC retail/demo or Mac Oni engine.
+Since the only difference between PC demo and Mac is the actual storage format of SNDD files (in the .raw part), and the template checksum is the same, OniSplit has no way of determining which ADPCM algorithm to use, other than by actually scanning and validating the data as IMA4 (or not). Starting with OniSplit v0.9.###, this automatic check is implemented, allowing both '''-extract:wav''' and '''-extract:pcm''' on PC-demo SNDDs. It is very unlikely that any Mac SNDDs will be falsely identified as MS ADPCM (or, rather, invalidated as IMA4). If it ever happens, do as instructed by the following warning: ''"PC-demo MS ADPCM detected; use '''-nodemo''' flag to treat as IMA4."''
+Note that transcoding (between IMA4 and MS ADPCM) and encoding is not implemented at this point. So '''-extract:aif''' will not work on PC SNDDs, '''-extract:wav''' will not work on Mac SNDDs, and '''-create''' will only work on sound files that use the correct codec and sample rate supported by the PC retail/demo or Mac Oni engine.
+Importing SNDDs for PC demo (with short .dat part and MS ADPCM in the .raw part) is also not implemented yet. Last but not least, PC retail apparently supports uncompressed PCM sounds, but they need to be tested in the engine first. Possibly ADPCM encoding/transcoding will be implemented at some point, too.
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