.wav

Experiments in digital soundwave/WAV file generation.
Warning: I was learning as I was writing, so the code is poorly formatted, cryptic, undocumented, with many notes-to-self.

There are samples of generated wave files in the samples/ directory. Turn your volume down for any with the word "danger" in their names. Some of my favorites:

• linksawakening.wav, for being one of my favorites pieces of VGM
• midi_stereo_dkccoral.wav, for being the most interesting (volume ramps, stereo audio, pitch bends, fake slapback delay)
• the best one yet.wav, you'll see why

Pages

• MIDI study document
• MIDI file hex inspection
• Notes on SF2 file format
• devlog I abandoned

Building and Running

There are currently only 2 main programs, midi2wav and sf2analyzer.

make midi2wav
bin/midi2wav MY_MIDI_FILE.mid

make sf2analyzer
bin/sf2analyzer MY_SOUNDFONT.sf2

TODO

• Add some formal notes on how MIDI time (division, ticks, etc.) works
• Allow specifying output file name
• Make midi2wav actually use the MIDI channel number
• Add some simple instrument definitions that can be used in midi2wav
• Become MIDI 1.0 compliant

References

• http://soundfile.sapp.org/doc/WaveFormat
• https://www.synthfont.com/SFSPEC21.PDF
• https://www.ibiblio.org/thammer/HammerSound/sd_computers_and_music/pitch.html
• https://ccrma.stanford.edu/~craig/14q/midifile/MidiFileFormat.html
• https://www.ccarh.org/courses/253/handout/vlv/
• http://personal.kent.edu/~sbirch/Music_Production/MP-II/MIDI/midi_file_format.htm
• https://drive.google.com/file/d/1t4jcCCKoi5HMi7YJ6skvZfKcefLhhOgU
• https://midimusic.github.io/tech/midispec.html

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Special thanks to Desmos for helping me visualize things, and ImHex for being amazing.