Add support for MIDI playback using FluidSynth#26
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benstone merged 4 commits intobenstone:mainfrom Mar 25, 2026
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benstone
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This method can be used by callers of the audio stream implementation to manage the ringbuffer usage.
Add FindFluidSynth.cmake to locate and use Fluidsynth on SDL builds, as well as FetchFluidSynth.cmake to download binary libraries and headers on Windows. Ensure that the github workflows are updated to reflect the new dependency.
This MIDI stream implementation uses FluidSynth to render audio samples for MIDI events used to play the background music on both Windows and Linux. Enable the FluidSynth MIDI stream implementation by default for SDL builds and for Windows builds include a MIT-licensed SoundFont from the musecore project. Update the THIRD_PARTY_LICENSES.txt to reflect the new dependencies.
Use the new MIDI streaming playback device for SDL-based builds.
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This series adds support for MIDI playback using FluidSynth to further replicate the original 3D Movie Maker experience with 3DMMEx! Whilst it is possible to use FluidSynth MIDI playback on both Windows and SDL builds, the default is to continue to use the Windows in-built MIDI player where present: but of course the main purpose is to allow MIDI playback on non-Windows platforms such as Linux.
Many thanks to @benstone for their help and advice when implementing this feature, including adding the prerequisite miniaudio audio backend along with a refactoring of the existing MIDI stream classes to make implementing this feature considerably simpler.