ValleyBell
commented
1 year ago I'm sure not if this will work well. This probably depends on what sort of music you want to listen to.
regarding CPU usage:
- PSG, WSG and PCM chips will probably work.
- FM emulation will probably not work, as it is generally very CPU heavy. (YM2612 emulation may work at 22 KHz? Avoid the "Nuked" cores and use EMU/MAME/GPGX cores to get a good performance.)
regarding memory usage:
- PSG, WSG and FM should be no problem.
- PCM chips can be difficult, as they may use rather large sample ROMs. (Especially NeoGeo games are known to have like 8 MB or 16 MB of sample ROMs and libvgm will allocate full memory for that.)
- libvgm is generally very generous when it comes to memory allocation.
- It always keeps a copy of the full VGM file in memory. (This is to simplify data access and because VGMs may be gzip-compressed.)
- The resampler allocates space for 1 second of sample data per chip by default.
You could easily reduce this to e.g. 0.1 second, though. see here: https://github.com/ValleyBell/libvgm/blob/079c4e737e6a73b38ae20125521d7d9eafda28e9/emu/Resampler.c#L81 - The YM2610 has its sample ROM memory allocated twice. (1x for ADPCM-A, 1x for ADPCM-B)
regarding programming language support:
- The sound chip emulation is pure C, so that will be no problem.
- File playback code is currently C++. A port to pure C is planned, but I haven't started yet.
Summary:
- emulation of PSG and WSG chips work
- FM and PCM chips may hit the platform's limits
- The resampler will need a one-line adjustment to reduce memory usage.
- file playback code is currently C++ and also keeps a full copy of the VGM file in memory
deanhuff
I'm looking for a chiptune player for an app that i'm writing to run on the playdate game console. The console has a 168MHz cpu, 16MB of ram, 4GB of flash storage. The SDK supports Lua & C. (more specs here: https://help.play.date/hardware/the-specs/)
do you think libvgm would be a good candidate to run on a playdate?