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Topic: OpenMPT Module Decoder (Read 28492 times) previous topic - next topic
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Re: OpenMPT Module Decoder

Reply #100
Today I noticed a post in the Discord server of the "Nectarine Demoscene Radio", they mentioned a YouTube video: Amazing AMIGA Multichannel Music - MoSeZ - NNZ Collection #1 - there is an archive of SymMOD modules as well as MP3 versions of the same tracks linked in its description.

Playing the first file (Gloomyness.SymMOD) I noticed that foobar2000 with OpenMPT module decoder 0.7.1 / 0.7.3 plays this song in mono. But the MP3 has a stereo panorama.

I don't know anything about this module format; might it be that its support is incomplete, and the decoder is unable to retrieve the position of instruments in an audio panorama? When I watch the YouTube video of an Amiga tracker it has an analyzer in the center of the screen, displaying dots on concentric rings, which looks like they should present a relation to instrument positions, I guess?

Re: OpenMPT Module Decoder

Reply #101
Not sure there is much to be done about SymMOD. I found https://bugs.openmpt.org/view.php?id=672 which shows that the format author has published Amiga assembler sources and a Java player. The Java player, which was used as a source to create the decoder, also plays these files as mono.

Re: OpenMPT Module Decoder

Reply #102
I see ... a demo player as reference may not be as optimal as a verbose specification though (and who knows, maybe even incomplete on purpose?).

I searched a little for "Symphonie module documentation / specification" but did not yet find them. Found a github repo of "compileable" sources at most. So it seems chances are that the player which allowed Nikol Nazarov to record MP3s from these modules is more elaborate than your OpenMPT module's source.

Shall I make a new issue on the tracker, linking the samples there as well?

PS: I tried to write Patrick Meng an email. But the bluewin address failed.

Re: OpenMPT Module Decoder

Reply #103
That repository is mentioned in the link I posted. Those are the Java player sources. Only other source is the original undocumented assembler code for the tracker, from the same guy. I hope you understand that re-creating the player from the assembler code would require insane amount of work.

Your Youtube video explains and shows the guy running the original tracker in Amiga emulator.

I'm not stopping you from creating a bug report, just warning that getting correct stereo playback may not be so simple.

Re: OpenMPT Module Decoder

Reply #104
I understand that completely, therefore, before doing so, I will try to collect more facts.

Re: OpenMPT Module Decoder

Reply #105
Attached is the glowyness.symmod module.
It can be downloaded from the link: ftp://ftp.modland.com/pub/modules/Symphonie/Mosez/gloomyness.symmod
Pay attention to the pattern structure of this module. Each pair of channels consists of a pair of identical instruments (see picture 1).
If you turn off some duplicate channels using View\OpenMPT control (see picture 2), then the stereo mode will be noticeable by ear.
I believe the reasons for this may be either in the libopenmpt library https://lib.openmpt.org/libopenmpt/ or this is a feature of this module.
For example, some parts of this module corona.symmod ftp://ftp.modland.com/pub/modules/Symphonie/Mosez/corona.symmod are played in stereo mode without turning off the channels.

By the way, it would be great if Peter updated this plugin with a new version of libopenmpt.

Re: OpenMPT Module Decoder

Reply #106
Unrelated question - it possible to improve the performance of pattern view display or is there some internal limitation to it?
Random digital audio nerd girl