commit c07837c3e2f3ee239983795fde748a1cfe404ef5 Author: Kelvin Ly Date: Fri Dec 20 09:08:59 2019 -0500 Implement recording callback and setup, TODO verify it works, start work on playback diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..53eaa21 --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +/target +**/*.rs.bk diff --git a/Cargo.lock b/Cargo.lock new file mode 100644 index 0000000..0138827 --- /dev/null +++ b/Cargo.lock @@ -0,0 +1,262 @@ +# This file is automatically @generated by Cargo. +# It is not intended for manual editing. +[[package]] +name = "alsa" +version = "0.2.2" +source = "registry+https://github.com/rust-lang/crates.io-index" +dependencies = [ + "alsa-sys 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)", + "bitflags 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)", + "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)", + "nix 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)", +] + 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https://doc.rust-lang.org/cargo/reference/manifest.html + +[dependencies] +midir = "0.5" +pancurses = "0.16" diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..51277fe --- /dev/null +++ b/src/main.rs @@ -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>, + state: Arc, + outer_start: Arc>, + ts_offset: u64, + msg_buf: Arc)>>>, +} + +struct Looper { + virtual_input: Arc>, + virtual_output: Arc>, + + cur_state: Arc, + // (time in milliseconds, msg) + msg_buf: Arc)>>>, + // for either playback or recording + start_time: Arc>, + playback_thread: Option, +} + +impl Looper { + const IDLE: usize = 0; + const RECORDING: usize = 1; + const PLAYBACK: usize = 2; + + fn new() -> Result> { + 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>{ + 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(); +}