Michael Gregorius c2f2b7e0d7 Handle divisions by 0 in Lb302 and Monstro (#7021)
* Handle divisions by 0 in Lb302

Handle potential division by 0 which in turn lead to floating point exceptions in Lb302. The division can occur in the `process` method if it is called with the member `vco_inc` still initialized to 0. This seems to happen then the Lb302 processes with no notes actually being played.

The offending call is `BandLimitedWave::pdToLen(vco_inc)` which is now prevented when the increment is 0. In the latter case a sample of 0 is produced. This works because in all other cases the Lb302 instance should process a note which in turn sets the increments to something different from 0.

* Fix FPEs in Monstro

Fix some floating point exceptions in `MonstroSynth::renderOutput` that occurred due to calling `BandLimitedWave::pdToLen` with a value of 0. This happened when one of the phase deltas was set to 0, i.e. `pd_l` or `pd_r`. These cases are now checked and produce silence in the corresponding components if the phase delta is set to 0.

* Fix uninitialized variables

Initialize the local variables `len_l` and `len_r` to 0. This fixes compiler warnings a la "error: 'len_r' may be used uninitialized in this function" which are treated as errors on the build server.

* Adjust whitespace of touched code
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LMMS Logo LMMS

Build status Latest stable release Overall downloads on Github Join the chat at Discord Localise on transifex

What is LMMS?

LMMS is a free cross-platform alternative to commercial programs like FL Studio®, which allow you to produce music with your computer. This includes the creation of melodies and beats, the synthesis and mixing of sounds, and arranging of samples. You can have fun with your MIDI-keyboard and much more; all in a user-friendly and modern interface.

Homepage
Downloads/Releases
Developer Wiki
Artist & User Wiki/Documentation
Sound Demos
LMMS Sharing Platform Share your songs!

Features

  • Song-Editor for composing songs
  • Pattern-Editor for creating beats and patterns
  • An easy-to-use Piano-Roll for editing patterns and melodies
  • A Mixer with unlimited mixer channels and arbitrary number of effects
  • Many powerful instrument and effect-plugins out of the box
  • Full user-defined track-based automation and computer-controlled automation sources
  • Compatible with many standards such as SoundFont2, VST(i), LADSPA, GUS Patches, and full MIDI support
  • MIDI file importing and exporting

Building

See Compiling LMMS on our wiki for information on how to build LMMS.

Join LMMS-development

If you are interested in LMMS, its programming, artwork, testing, writing demo songs, (and improving this README...) or something like that, you're welcome to participate in the development of LMMS!

Information about what you can do and how can be found in the wiki.

Before coding a new big feature, please always file an issue for your idea and suggestions about your feature and about the intended implementation on GitHub, or ask in one of the tech channels on Discord and wait for replies! Maybe there are different ideas, improvements, or hints, or maybe your feature is not welcome/needed at the moment.

Description
Custom LMMS fork because upstream hasn't merged the cool stuff yet. Contains Disintegrator violently vibefixed from a 7-year-old PR.
Readme 155 MiB
Build Latest
2026-03-15 04:54:16 +01:00
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