request: gbsinfo for specified subsong about gbsplay HOT 5 OPEN

Effectively the header does not have length information, the only way is to actually to run the song and see if it ends in silence or loops forever.

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The best way to add this would be to have a database file with information about all known game music dumps.

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this seems like a candidate for a backwards-compatible GBSv2. maybe past a certain point in the data (how many banks do games USE for audio?) there could be data about estimated song lengths. this data could be summed to create a total length.

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gbsplay actually has a spec for an extended format, see https://github.com/mmitch/gbsplay/blob/master/gbsformat.txt which includes "Length of Subsong" already.
However that requires updating the files themselves, by now I think that a hvsc-style database file is a better approach (https://hvsc.de/download/C64Music/DOCUMENTS/Songlengths.faq).

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With commit 9f3e0ed we have removed the support of the extended format mentioned above. So there currently is no subsong specific information available that gbsinfo could display.

The hvsc style database would be a solution to the original request, but I think that is more of a separate general community project than a new feature to gbsplay.

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