I forgot to mention here, the NNA bugfix has found its way into libopenmpt in the meantime, and I also have a commit ready that will add most of the suggested APIs. One that is currently still missing is the one for changing the channel pitch. As I wanted to avoid duplicate code for this feature that will just be used by libopenmpt_ext, I thought that this new API could be based on the recently-added
high-precision finetune commands. The resulting API semantics could end up slightly different, though:
The effective depth of the Set Finetune command can be configured individually for each instrument. It's at least +/-1 semitone, but every instrument can in theory have a different finetune depth. I see this both as an upside and a downside:
- Depending on how the module instruments are set up, it would be more difficult to consistently change the pitch for several instruments.
- However, this can also be seen as an advantage: If the API is intended to be used for adding variations to sound effects, you can set up the optimal pitch range for each individual sound effect in the module.
As a compromise, the depth could be restricted to +/-1 semitone for
all instruments at the API level, which would result in a lower pitch resolution for instruments that internally have a higher depth configured, though.
Maybe you could give a quick description of what you want to achieve with this API, so that we can better judge which approach would be the best.
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Would be great if I can get this working some way down the line.