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This commit is contained in:
Gwilym Inzani 2023-11-01 13:12:02 +00:00
parent 7868094f7e
commit 64976deeb5
1 changed files with 80 additions and 60 deletions
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140
tracker/agb-midi-core/src/lib.rs
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@ -87,63 +87,6 @@ impl MidiInfo {
}
pub fn parse_midi(midi_info: &MidiInfo) -> TokenStream {
let midi = &midi_info.midi;
assert_eq!(
midi.header.format,
Format::SingleTrack,
"Only single track is currently supported"
);
let Timing::Metrical(timing) = midi.header.timing else { panic!("Only metrical timing is currently supported") };
let ticks_per_beat = timing.as_int();
let mut channel_data = vec![];
let mut current_ticks = 0;
let mut pattern = vec![];
let mut initial_microseconds_per_beat = None;
for event in &midi.tracks[0] {
current_ticks += event.delta.as_int();
match event.kind {
TrackEventKind::Midi { channel, message } => {
let channel_id = channel.as_int() as usize;
channel_data.resize(
channel_data.len().max(channel_id + 1),
ChannelData::default(),
);
let channel_data = &mut channel_data[channel_id];
match message {
midly::MidiMessage::NoteOff { .. } => pattern.push(PatternSlot {
speed: 0.into(),
sample: 0,
effect1: PatternEffect::Stop,
effect2: PatternEffect::None,
}),
midly::MidiMessage::NoteOn { key, vel } => pattern.push(PatternSlot {
speed: midi_key_to_speed(key.as_int() as i8),
sample: channel_data.current_sample,
effect1: PatternEffect::Volume(Num::from_f32(vel.as_int() as f32 / 128.0)),
effect2: PatternEffect::None,
}),
midly::MidiMessage::Aftertouch { .. } => {}
midly::MidiMessage::PitchBend { .. } => {}
midly::MidiMessage::ProgramChange { program } => {
channel_data.current_sample = program.as_int().into();
}
midly::MidiMessage::Controller { .. } => {}
midly::MidiMessage::ChannelAftertouch { .. } => {}
}
}
TrackEventKind::Meta(MetaMessage::Tempo(tempo)) => {
initial_microseconds_per_beat = Some(tempo.as_int());
}
_ => {}
}
}
let mut samples = vec![];
let sf2 = &midi_info.sound_font;
let sf2_data = sf2.get_wave_data();
@ -179,6 +122,83 @@ pub fn parse_midi(midi_info: &MidiInfo) -> TokenStream {
samples.push(sample);
}
let midi = &midi_info.midi;
assert_eq!(
midi.header.format,
Format::SingleTrack,
"Only single track is currently supported"
);
let Timing::Metrical(timing) = midi.header.timing else { panic!("Only metrical timing is currently supported") };
let ticks_per_beat = timing.as_int();
let mut channel_data = vec![];
let mut current_ticks = 0;
let mut initial_microseconds_per_beat = None;
let mut patterns = vec![];
for event in &midi.tracks[0] {
current_ticks += event.delta.as_int();
match event.kind {
TrackEventKind::Midi { channel, message } => {
let channel_id = channel.as_int() as usize;
channel_data.resize(
channel_data.len().max(channel_id + 1),
ChannelData::default(),
);
patterns.resize_with(patterns.len().max(channel_id + 1), Vec::new);
let channel_data = &mut channel_data[channel_id];
let pattern = &mut patterns[channel_id];
pattern.resize_with((current_ticks as usize).saturating_sub(1), || PatternSlot {
speed: 0.into(),
sample: 0,
effect1: PatternEffect::None,
effect2: PatternEffect::None,
});
match message {
midly::MidiMessage::NoteOff { .. } => pattern.push(PatternSlot {
speed: 0.into(),
sample: 0,
effect1: PatternEffect::Stop,
effect2: PatternEffect::None,
}),
midly::MidiMessage::NoteOn { key, vel } => pattern.push(PatternSlot {
speed: midi_key_to_speed(key.as_int() as i8),
sample: channel_data.current_sample,
effect1: PatternEffect::Volume(Num::from_f32(vel.as_int() as f32 / 128.0)),
effect2: PatternEffect::None,
}),
midly::MidiMessage::Aftertouch { .. } => {}
midly::MidiMessage::PitchBend { .. } => {}
midly::MidiMessage::ProgramChange { program } => {
channel_data.current_sample = program.as_int().into();
}
midly::MidiMessage::Controller { .. } => {}
midly::MidiMessage::ChannelAftertouch { .. } => {}
}
}
TrackEventKind::Meta(MetaMessage::Tempo(tempo)) => {
initial_microseconds_per_beat = Some(tempo.as_int());
}
_ => {}
}
}
for pattern in &mut patterns {
pattern.resize_with(current_ticks as usize, || PatternSlot {
speed: 0.into(),
sample: 0,
effect1: PatternEffect::None,
effect2: PatternEffect::None,
});
}
let samples: Vec<_> = samples
.iter()
.map(|sample| Sample {
@ -191,7 +211,7 @@ pub fn parse_midi(midi_info: &MidiInfo) -> TokenStream {
})
.collect();
let pattern = pattern.into_iter().collect::<Vec<_>>();
let pattern = patterns.into_iter().flatten().collect::<Vec<_>>();
let track = Track {
samples: &samples,
@ -206,7 +226,7 @@ pub fn parse_midi(midi_info: &MidiInfo) -> TokenStream {
frames_per_tick: Num::from_f64(
initial_microseconds_per_beat.expect("No tempo was ever sent") as f64 / 16742.706298828, // microseconds per frame
),
ticks_per_step: ticks_per_beat.into(),
ticks_per_step: 1,
repeat: 0,
};
@ -219,5 +239,5 @@ struct ChannelData {
}
fn midi_key_to_speed(key: i8) -> Num<u16, 8> {
Num::from_f64(440.0 * 2f64.powf((key - 69) as f64 / 12.0))
Num::from_f64(2f64.powf((key - 69) as f64 / 12.0))
}