commit 5473b2d9a09952a3c2d05e93433322ece555c157
Author: minerva-jupiter <ryouturn@gmail.com>
Date: Fri, 7 Nov 2025 21:59:41 +0900
init commit
Diffstat:
| A | .env | | | 1 | + |
| A | .gitignore | | | 1 | + |
| A | Cargo.lock | | | 508 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | Cargo.toml | | | 8 | ++++++++ |
| A | src/data.rs | | | 38 | ++++++++++++++++++++++++++++++++++++++ |
| A | src/generator.rs | | | 114 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | src/main.rs | | | 103 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | src/midi_io.rs | | | 45 | +++++++++++++++++++++++++++++++++++++++++++++ |
8 files changed, 818 insertions(+), 0 deletions(-)
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diff --git a/.gitignore b/.gitignore
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diff --git a/Cargo.toml b/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "auto-musik"
+version = "0.1.0"
+edition = "2024"
+
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+rand = "0.9.2"
diff --git a/src/data.rs b/src/data.rs
@@ -0,0 +1,38 @@
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub enum NoteEvent {
+ // Note On:
+ NoteOn { note: u8, velocity: u8 },
+ // Note Off:
+ NoteOff { note: u8 },
+}
+
+#[derive(Debug, Clone, PartialEq)]
+pub struct Bar {
+ pub beat: Beat,
+ pub tonality: Tonality,
+ pub chord: Chord,
+ pub events: Vec<(u64, NoteEvent)>,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub enum Beat {
+ TwoFourth,
+ ThreeFourth,
+ FourFourth,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub enum Tonality {
+ CM,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub enum Chord {
+ First,
+ Second,
+ Third,
+ Fourth,
+ Fifth,
+ Sixth,
+ Seventh,
+}
diff --git a/src/generator.rs b/src/generator.rs
@@ -0,0 +1,114 @@
+use crate::data::{Bar, Beat, Chord, NoteEvent, Tonality};
+use rand::Rng;
+use std::collections::HashMap;
+
+pub struct MusicGenerator {
+ previous_state: Chord,
+ transition_model: HashMap<Chord, Vec<(Chord, u32)>>,
+}
+
+impl MusicGenerator {
+ pub fn new() -> Self {
+ use Chord::*;
+ let mut model = HashMap::new();
+
+ model.insert(
+ First,
+ vec![
+ (Fourth, 5), // I -> IV (F) に行きやすい
+ (Fifth, 3), // I -> V (G) もあり
+ (Sixth, 2), // I -> VI (Am) もあり
+ (First, 1), // I のまま留まる
+ ],
+ );
+
+ model.insert(
+ Fourth,
+ vec![
+ (Fifth, 8), // IV -> V (G) に行きやすい
+ (First, 2), // IV -> I (C) に戻る
+ ],
+ );
+
+ model.insert(
+ Fifth,
+ vec![
+ (First, 10), // V -> I (C) に戻るのが基本
+ ],
+ );
+
+ model.insert(Sixth, vec![(Fourth, 5), (First, 5)]); // Am -> F or C
+ model.insert(Second, vec![(Fifth, 10)]); // Dm -> G
+
+ MusicGenerator {
+ previous_state: First, // 初期状態は I (C)
+ transition_model: model,
+ }
+ }
+
+ pub fn generate_next_bar(&mut self) -> Bar {
+ let next_chord = self.choose_next_state();
+
+ let next_bar = self.generate_events_for_chord(next_chord);
+
+ self.previous_state = next_chord;
+ next_bar
+ }
+
+ fn choose_next_state(&self) -> Chord {
+ let options = self
+ .transition_model
+ .get(&self.previous_state)
+ .unwrap_or_else(|| panic!("there no code {:?} on this model", self.previous_state));
+
+ let total_weight: u32 = options.iter().map(|(_, w)| w).sum();
+ let mut rng = rand::rng();
+ let mut target = rng.random_range(0..total_weight);
+
+ for (state, weight) in options {
+ if target < *weight {
+ return *state;
+ }
+ target -= weight;
+ }
+ options[0].0
+ }
+
+ fn generate_events_for_chord(&self, chord: Chord) -> Bar {
+ let root_note = match chord {
+ Chord::First => 60, // C4
+ Chord::Second => 62, // D4
+ Chord::Third => 64, // E4
+ Chord::Fourth => 65, // F4
+ Chord::Fifth => 67, // G4
+ Chord::Sixth => 69, // A4
+ Chord::Seventh => 71, // B4
+ };
+
+ let mut events = Vec::new();
+ const NOTE_DURATION: u64 = 480; // 500ms - 20ms の隙間
+
+ for i in 0..4 {
+ let time_ms = (i as u64) * 500;
+
+ events.push((
+ time_ms,
+ NoteEvent::NoteOn {
+ note: root_note,
+ velocity: 90,
+ },
+ ));
+ events.push((
+ time_ms + NOTE_DURATION,
+ NoteEvent::NoteOff { note: root_note },
+ ));
+ }
+
+ Bar {
+ beat: Beat::FourFourth,
+ tonality: Tonality::CM,
+ chord,
+ events,
+ }
+ }
+}
diff --git a/src/main.rs b/src/main.rs
@@ -0,0 +1,103 @@
+mod data;
+mod generator;
+mod midi_io;
+
+use data::{Bar, NoteEvent};
+use generator::MusicGenerator;
+use midi_io::MidiTransmitter;
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+ let target_port_name = "Microsoft GS Wavetable Synth";
+ let mut transmitter = MidiTransmitter::new(target_port_name)?;
+
+ let mut generator = MusicGenerator::new();
+
+ // 1分(60,000ms) / 120 = 500ms が四分音符の長さ
+ const QUARTER_NOTE_DURATION_MS: u64 = 500;
+
+ let start_time = std::time::Instant::now();
+ let mut current_time_ms: u64 = 0;
+
+ loop {
+ let next_bar: Bar = generator.generate_next_bar();
+ println!("Generated Chord is: {:?}", next_bar.chord); // どのコードが選ばれたか表示
+
+ let bar_duration_ms = 4 * QUARTER_NOTE_DURATION_MS;
+
+ for (event_time_offset, event) in next_bar.events.iter() {
+ let target_absolute_time_ms = current_time_ms + event_time_offset;
+
+ let elapsed_time = start_time.elapsed().as_millis() as u64;
+
+ if target_absolute_time_ms > elapsed_time {
+ let wait_time_ms = target_absolute_time_ms - elapsed_time;
+ std::thread::sleep(std::time::Duration::from_millis(wait_time_ms));
+ }
+
+ if let Some(message) = note_event_to_midi_message(*event)
+ && let Err(e) = transmitter.send_message(&message)
+ {
+ eprintln!("Midi sending error: {}", e);
+ }
+ }
+
+ current_time_ms += bar_duration_ms;
+
+ let elapsed_time = start_time.elapsed().as_millis() as u64;
+ if current_time_ms > elapsed_time {
+ let wait_time_ms = current_time_ms - elapsed_time;
+ std::thread::sleep(std::time::Duration::from_millis(wait_time_ms));
+ }
+ }
+}
+
+fn note_event_to_midi_message(event: NoteEvent) -> Option<[u8; 3]> {
+ match event {
+ NoteEvent::NoteOn { note, velocity } => Some([0x90, note, velocity]),
+ NoteEvent::NoteOff { note } => Some([0x80, note, 0]),
+ }
+}
+
+// ----------------------------------------------------
+// 3. generator.rs の調整（data.rs に合わせて）
+// ----------------------------------------------------
+// generator.rs の MusicGenerator::new() で、HashMapのキーとして
+// data::Chord を使うように修正します。
+// 例: model.insert(Chord::First, vec![(Chord::Fourth, 7), ...]);
+// また、generate_events_for_state() も Chord に対応させてください。
+
+/* this is test for midi_io.ts
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+ println!("avalable Midi ports");
+ if let Ok(midi_out) = MidiOutput::new("temp_lister") {
+ for name in MidiTransmitter::get_port_names(&midi_out) {
+ println!(" - {}", name);
+ }
+ } else {
+ println!("Failed to initialize Midi output");
+ }
+ println!("---------------------------------");
+
+ let target_port_name = "Synth";
+
+ let mut transmitter = MidiTransmitter::new(target_port_name)?;
+
+ // Note On: 0x9n (n=チャンネル), ノート番号(60=C4), ベロシティ(100)
+ let note_on_c4: [u8; 3] = [0x90, 60, 100];
+ // Note Off: 0x8n (n=チャンネル), ノート番号(60=C4), ベロシティ(0)
+ let note_off_c4: [u8; 3] = [0x80, 60, 0];
+
+ println!("Sending C4 vel 100 on channel");
+ transmitter.send_message(¬e_on_c4)?;
+
+ std::thread::sleep(std::time::Duration::from_millis(500));
+
+ println!("Sending C4 vel 100 off channel");
+ transmitter.send_message(¬e_off_c4)?;
+
+ std::thread::sleep(std::time::Duration::from_millis(100));
+
+ println!("Done");
+ Ok(())
+}
+*/
diff --git a/src/midi_io.rs b/src/midi_io.rs
@@ -0,0 +1,45 @@
+use midir::{MidiOutput, MidiOutputConnection, MidiOutputPort};
+
+pub struct MidiTransmitter {
+ conn: MidiOutputConnection,
+}
+
+type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
+
+impl MidiTransmitter {
+ pub fn new(port_name: &str) -> Result<Self> {
+ let midi_out = MidiOutput::new("Rust Midi Generator")?;
+
+ let out_port = Self::find_port(&midi_out, port_name)?;
+ let actual_port_name = midi_out.port_name(&out_port)?;
+
+ println!("We use to connect port: {}", actual_port_name);
+
+ let conn = midi_out.connect(&out_port, "midir-output-port")?;
+
+ Ok(MidiTransmitter { conn })
+ }
+
+ fn find_port(midi_out: &MidiOutput, search_name: &str) -> Result<MidiOutputPort> {
+ for port in midi_out.ports().iter() {
+ let name = midi_out.port_name(port)?;
+ if name.contains(search_name) {
+ return Ok(port.clone());
+ }
+ }
+
+ Err(format!("Midi port named '{}' was not found ", search_name).into())
+ }
+
+ pub fn send_message(&mut self, message: &[u8]) -> std::result::Result<(), midir::SendError> {
+ self.conn.send(message)
+ }
+
+ pub fn get_port_names(midi_out: &MidiOutput) -> Vec<String> {
+ midi_out
+ .ports()
+ .iter()
+ .filter_map(|p| midi_out.port_name(p).ok())
+ .collect()
+ }
+}
