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Pitch bending

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This commit is contained in:
Gwilym Inzani 2023-11-15 13:40:13 +00:00
parent bf79b09e6a
commit 0a13b54e12
3 changed files with 31 additions and 1 deletions
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20
tracker/agb-midi-core/src/lib.rs
View file

@ -236,7 +236,25 @@ pub fn parse_midi(midi_info: &MidiInfo) -> TokenStream {
});
}
midly::MidiMessage::Aftertouch { .. } => {}
midly::MidiMessage::PitchBend { .. } => {}
midly::MidiMessage::PitchBend { bend } => {
// bend is between 0 and 8192 where 0 = -2 semitones and 8193 is +2 semitones (I think)
let amount = (bend.0.as_int() as f64 - (8192.0 / 2.0)) / (8192.0 / 2.0);
// amount is now between -1 and 1
let two_semitones_multiplier = 493.88 / 440.0; // B4 / A4
let amount = if amount < 0.0 {
1.0 / two_semitones_multiplier * (-amount)
} else {
two_semitones_multiplier * amount
};
pattern.push(PatternSlot {
speed: 0.into(),
sample: 0,
effect1: PatternEffect::PitchBend(Num::from_f64(amount)),
effect2: PatternEffect::None,
});
}
midly::MidiMessage::ProgramChange { program } => {
let mut lookup_id = program.as_int().into();
if channel_id == 9 {

6
tracker/agb-tracker-interop/src/lib.rs
View file

@ -69,6 +69,8 @@ pub enum PatternEffect {
SetFramesPerTick(Num<u32, 8>),
SetGlobalVolume(Num<i32, 8>),
GlobalVolumeSlide(Num<i32, 8>),
/// Increase / decrease the pitch by the specified amount immediately
PitchBend(Num<u32, 8>),
}
#[cfg(feature = "quote")]
@ -311,6 +313,10 @@ impl quote::ToTokens for PatternEffect {
let amount = amount.to_raw();
quote! { GlobalVolumeSlide(agb_tracker::__private::Num::from_raw(#amount)) }
}
PatternEffect::PitchBend(amount) => {
let amount = amount.to_raw();
quote! { PitchBend(agb_tracker::__private::Num::from_raw(#amount)) }
}
};
tokens.append_all(quote! {

6
tracker/agb-tracker/src/lib.rs
View file

@ -428,6 +428,12 @@ impl TrackerChannel {
channel.playback(self.base_speed.change_base());
}
PatternEffect::PitchBend(amount) => {
if tick == 0 {
self.base_speed *= amount.change_base();
channel.playback(self.base_speed.change_base());
}
}
// These are global effects handled below
PatternEffect::SetTicksPerStep(_)
| PatternEffect::SetFramesPerTick(_)