Implement recording callback and setup, TODO verify it works, start work on playback
This commit is contained in:
commit
c07837c3e2
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/target
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**/*.rs.bk
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|
||||
|
|
@ -0,0 +1,11 @@
|
|||
[package]
|
||||
name = "midi-looper"
|
||||
version = "0.1.0"
|
||||
authors = ["Kelvin Ly <kelvin.ly1618@gmail.com>"]
|
||||
edition = "2018"
|
||||
|
||||
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
|
||||
|
||||
[dependencies]
|
||||
midir = "0.5"
|
||||
pancurses = "0.16"
|
||||
|
|
@ -0,0 +1,177 @@
|
|||
extern crate midir;
|
||||
extern crate pancurses;
|
||||
|
||||
use std::error::Error;
|
||||
use std::thread;
|
||||
use std::time::{Duration, Instant};
|
||||
use std::sync::{Arc, Mutex};
|
||||
use std::sync::atomic::{AtomicUsize, Ordering};
|
||||
|
||||
use midir::os::unix::{VirtualInput, VirtualOutput};
|
||||
|
||||
use pancurses::{initscr, endwin, noecho, Input};
|
||||
|
||||
#[derive(Clone, Copy, Debug)]
|
||||
enum LooperState {
|
||||
Idle,
|
||||
Recording,
|
||||
Playing
|
||||
}
|
||||
|
||||
struct LooperInputCallback {
|
||||
output: Arc<Mutex<midir::MidiOutputConnection>>,
|
||||
state: Arc<AtomicUsize>,
|
||||
outer_start: Arc<Mutex<Instant>>,
|
||||
ts_offset: u64,
|
||||
msg_buf: Arc<Mutex<Vec<(u64, Vec<u8>)>>>,
|
||||
}
|
||||
|
||||
struct Looper {
|
||||
virtual_input: Arc<midir::MidiInputConnection<LooperInputCallback>>,
|
||||
virtual_output: Arc<Mutex<midir::MidiOutputConnection>>,
|
||||
|
||||
cur_state: Arc<AtomicUsize>,
|
||||
// (time in milliseconds, msg)
|
||||
msg_buf: Arc<Mutex<Vec<(u64, Vec<u8>)>>>,
|
||||
// for either playback or recording
|
||||
start_time: Arc<Mutex<Instant>>,
|
||||
playback_thread: Option<std::thread::Thread>,
|
||||
}
|
||||
|
||||
impl Looper {
|
||||
const IDLE: usize = 0;
|
||||
const RECORDING: usize = 1;
|
||||
const PLAYBACK: usize = 2;
|
||||
|
||||
fn new() -> Result<Looper, Box<dyn Error>> {
|
||||
let input = midir::MidiInput::new("midi looper")?;
|
||||
let output = midir::MidiOutput::new("midi looper")?;
|
||||
|
||||
let cur_state = Arc::new(AtomicUsize::new(Looper::IDLE));
|
||||
let msg_buf = Arc::new(Mutex::new(Vec::new()));
|
||||
let start_time = Arc::new(Mutex::new(Instant::now()));
|
||||
|
||||
let output_unboxed = output.create_virtual("looper output")?;
|
||||
let virtual_output = Arc::new(Mutex::new(output_unboxed));
|
||||
|
||||
let virtual_input = input.create_virtual(
|
||||
"looper input",
|
||||
|ts, data, me| {
|
||||
{
|
||||
let mut out = me.output.lock().unwrap();
|
||||
out.send(data);
|
||||
}
|
||||
if me.state.load(Ordering::Acquire) == Looper::RECORDING {
|
||||
let msg_time = Instant::now();
|
||||
let ts_millis = ts/1000;
|
||||
|
||||
let mut buf = me.msg_buf.lock().unwrap();
|
||||
|
||||
// new recording session; find the new offset
|
||||
if buf.len() == 0 {
|
||||
let record_start = me.outer_start.lock().unwrap();
|
||||
let time_since_start = msg_time.duration_since(*record_start);
|
||||
// let's assume the user pressed their first note less than
|
||||
// 2^64 milliseconds after starting recording
|
||||
let time_millis = time_since_start.as_millis() as u64;
|
||||
me.ts_offset = ts_millis - time_millis;
|
||||
}
|
||||
buf.push((ts_millis - me.ts_offset, data.to_vec()));
|
||||
}
|
||||
}, LooperInputCallback {
|
||||
output: virtual_output.clone(),
|
||||
state: cur_state.clone(),
|
||||
outer_start: start_time.clone(),
|
||||
ts_offset: 0,
|
||||
msg_buf: msg_buf.clone(),
|
||||
})?;
|
||||
|
||||
Ok(Looper {
|
||||
virtual_input: Arc::new(virtual_input),
|
||||
virtual_output,
|
||||
|
||||
cur_state: cur_state.clone(),
|
||||
msg_buf: msg_buf.clone(),
|
||||
start_time: start_time.clone(),
|
||||
playback_thread: None,
|
||||
})
|
||||
}
|
||||
|
||||
fn toggle_state(&mut self) -> Result<(), Box<dyn Error>>{
|
||||
let now = Instant::now();
|
||||
let next_state = (self.cur_state.load(Ordering::Acquire) + 1) % 3;
|
||||
match next_state {
|
||||
Looper::RECORDING => {
|
||||
let mut buf = self.msg_buf.lock().unwrap();
|
||||
let mut start_time = self.start_time.lock().unwrap();
|
||||
buf.clear();
|
||||
*start_time = now;
|
||||
},
|
||||
Looper::PLAYBACK => {
|
||||
// TODO
|
||||
},
|
||||
_ => ()
|
||||
}
|
||||
self.cur_state.store(next_state, Ordering::Release);
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn state(&self) -> LooperState {
|
||||
let cur_state = self.cur_state.load(Ordering::Acquire);
|
||||
match cur_state {
|
||||
0 => LooperState::Idle,
|
||||
1 => LooperState::Recording,
|
||||
2 => LooperState::Playing,
|
||||
_ => unreachable!("invalid looper state reached {}", cur_state)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn main() {
|
||||
let mut looper = Looper::new().unwrap();
|
||||
|
||||
let window = initscr();
|
||||
window.printw("============================\n");
|
||||
window.printw("======== MIDI LOOPER =======\n");
|
||||
window.printw("============================\n");
|
||||
window.printw("\n");
|
||||
window.printw("IDLE\n");
|
||||
window.printw("\n");
|
||||
window.printw("\n");
|
||||
window.printw("\n");
|
||||
window.printw("\n");
|
||||
window.printw("start/stop = space\n");
|
||||
window.printw("save = s\n");
|
||||
window.printw("exit = Esc/Ctrl-C\n");
|
||||
window.refresh();
|
||||
window.keypad(true);
|
||||
noecho();
|
||||
loop {
|
||||
match window.getch() {
|
||||
Some(Input::Character('\x1b')) => break,
|
||||
Some(Input::Character(c)) => {
|
||||
match c {
|
||||
' ' => {
|
||||
looper.toggle_state().unwrap();
|
||||
window.mvprintw(4, 0, match looper.state() {
|
||||
LooperState::Idle => "IDLE ",
|
||||
LooperState::Recording => "RECORDING",
|
||||
LooperState::Playing => "PLAYING "
|
||||
});
|
||||
window.mv(12, 0);
|
||||
window.refresh();
|
||||
},
|
||||
's' => {
|
||||
},
|
||||
_ => ()
|
||||
}
|
||||
},
|
||||
Some(input) => {
|
||||
window.addstr(&format!("{:?}", input));
|
||||
window.refresh();
|
||||
},
|
||||
None => ()
|
||||
}
|
||||
}
|
||||
endwin();
|
||||
}
|
||||
Loading…
Reference in New Issue