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libaudio

Sound for Bleed programs, on top of the kernel's /dev/audio0.

  • a mixer: 32 sample voices, any rate, 8 or 16 bit, mono or stereo, resampled to the card
  • general midi on 16 channels through a soundfont (.sf2), synthesised by TinySoundFont (MIT, vendored in src/vendor)
  • the first .sf2 in /initrd/soundfonts is the default bank, Bleed ships TimGM6mb there
  • a midi file player, type 0 and 1
  • play, a little command line player for .wav and .mid

Nothing runs by itself, theres no threads. Call au_pump() often, or au_sleep_ms() instead of sleeping, and it renders enough to keep the card going till the next call. How far ahead it renders follows how long the gaps between calls are, between AU_LEAD_MIN_MS and AU_LEAD_MAX_MS.

#include <bleed_audio.h>

au_open();
au_bank_load_default();

au_song_t *song = au_song_load(mid, mid_len);
au_song_play(song, 1);

au_sample_t boom = { data, frames, 11025, AU_U8, 1 };
au_play(&boom, 127, 64, 0);

for (;;) {
    game_frame();
    au_pump();
}