[Question] How to properly retrieve the number of tracks in the song?

[Wohlstand]

Hello!

At my library (where I use libXMP), I do use the music->fi.virt_channels field to retrieve a number of channels (I need that to pass into the UI of my player to allow the user to mute each track of the song individually). However, one of the users reported that there is an IT file with 16 tracks programmed, and reported 144 tracks. Should I use a different way to retrieve a number of tracks in the song to report them correctly?

The test file: pm-shiver-mountain.it.gz

[AliceLR]

The correct field should be xmp_module::chn—for IT modules, xmp_frame_info::virt_channels will report that number +128 because libxmp allocates 128 virtual channels to handle NNAs. Using the SMIX API can also affect that number IIRC.

[Wohlstand]

I see, thanks for the note, but:

xmp_module::chn—for IT modules

Is this valid for all other modules too? Which way is universal?

EDIT: I tested the thing on various formats (which examples I had at me: IT, MOD, XM, S3M, PSM, AMF, IMF), and they work fine and report a proper number of channels. I am not sure if this way is valid for all formats, mainly because of your "for IT modules" phrase which expects "way for IT modules exclusively".

[AliceLR]

Ok, to rephrase: the correct field is xmp_module::chn.

For IT modules, and most likely for any module where SMIX has been enabled (not sure), xmp_frame_info::virt_channels is guaranteed to report the wrong number.

[sezero]

I think this can be closed now. If there are still unclear points or further questions, then re-open.

[Wohlstand]

Ye, it's fine to close, the question was solved a while ago.