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use gtk;
use gtk::prelude::*;
use std::cell::RefCell;
use portaudio as pa;
use std::rc::Rc;
use std::io;
use std::io::Write;
use std::thread;
use std::sync::mpsc::*;
struct RustyUi {
window: gtk::Window,
dropdown: gtk::ComboBoxText,
pitch_label: gtk::Label,
freq_chart: gtk::DrawingArea
}
struct ApplicationState {
pa: pa::PortAudio,
pa_stream: Option<pa::Stream<pa::NonBlocking, pa::Input<f32>>>
}
pub fn start_gui() -> Result<(), String> {
let pa = try!(::audio::init().map_err(|e| e.to_string()));
let microphones = try!(::audio::get_device_list(&pa).map_err(|e| e.to_string()));
let (mic_sender, mic_receiver) = channel();
let state = Rc::new(RefCell::new(ApplicationState {
pa: pa,
pa_stream: None
}));
try!(gtk::init().map_err(|_| "Failed to initialize GTK."));
let ui = create_window(microphones);
connect_dropdown_choose_microphone(&ui.dropdown, mic_sender, state.clone());
let (pitch_sender, pitch_receiver) = channel();
let (freq_sender, freq_receiver) = channel();
start_processing_audio(mic_receiver, pitch_sender, freq_sender);
setup_pitch_label_callbacks(ui.pitch_label, pitch_receiver);
setup_drawing_area_callbacks(ui.freq_chart, freq_receiver);
gtk::main();
Ok(())
}
fn create_window(microphones: Vec<(u32, String)>) -> RustyUi {
let window = gtk::Window::new(gtk::WindowType::Toplevel);
window.set_title("Rusty Microphone");
window.connect_delete_event(|_, _| {
gtk::main_quit();
Inhibit(false)
});
let layout_box = gtk::Box::new(gtk::Orientation::Vertical, 5);
window.add(&layout_box);
let dropdown = gtk::ComboBoxText::new();
set_dropdown_items(&dropdown, microphones);
layout_box.add(&dropdown);
let pitch_label = gtk::Label::new(None);
layout_box.add(&pitch_label);
let freq_chart = gtk::DrawingArea::new();
freq_chart.set_size_request(600, 400);
layout_box.add(&freq_chart);
window.show_all();
RustyUi {
window: window,
dropdown: dropdown,
pitch_label: pitch_label,
freq_chart: freq_chart
}
}
fn set_dropdown_items(dropdown: >k::ComboBoxText, microphones: Vec<(u32, String)>) {
for (index, name) in microphones {
dropdown.append(Some(format!("{}", index).as_ref()), name.as_ref());
}
}
fn connect_dropdown_choose_microphone(dropdown: >k::ComboBoxText, mic_sender: Sender<Vec<f64>>, state: Rc<RefCell<ApplicationState>>) {
dropdown.connect_changed(move |dropdown: >k::ComboBoxText| {
match state.borrow_mut().pa_stream {
Some(ref mut stream) => {stream.stop().ok();},
_ => {}
}
let selected_mic = match dropdown.get_active_id().and_then(|id| id.parse().ok()) {
Some(mic) => mic,
None => {return;}
};
let stream = ::audio::start_listening(&state.borrow().pa, selected_mic, mic_sender.clone()).ok();
if stream.is_none() {
writeln!(io::stderr(), "Failed to open audio channel").ok();
}
state.borrow_mut().pa_stream = stream;
});
}
fn start_processing_audio(mic_receiver: Receiver<Vec<f64>>, pitch_sender: Sender<String>, freq_sender: Sender<Vec<::transforms::FrequencyBucket>>) {
thread::spawn(move || {
for samples in mic_receiver {
let frequency_domain = ::transforms::fft(samples, 44100.0);
freq_sender.send(frequency_domain.clone());
let fundamental = ::transforms::find_fundamental_frequency(&frequency_domain);
let pitch = match fundamental {
Some(fundamental) => ::transforms::hz_to_pitch(fundamental),
None => "".to_string()
};
pitch_sender.send(pitch).ok();
}
});
}
fn setup_pitch_label_callbacks(pitch_label: gtk::Label, pitch_receiver: Receiver<String>) {
gtk::timeout_add(100, move || {
let mut pitch = None;
loop {
let next = pitch_receiver.try_recv().ok();
if next.is_none() {
break;
}
pitch = next;
}
match pitch {
Some(pitch) => {pitch_label.set_label(pitch.as_ref());},
None => {}
};
gtk::Continue(true)
});
}
fn setup_drawing_area_callbacks(canvas: gtk::DrawingArea, freq_receiver: Receiver<Vec<::transforms::FrequencyBucket>>) {
canvas.connect_draw(move |ref canvas, ref context| {
let mut last_signal = Vec::new();
loop {
let next = freq_receiver.try_recv().ok();
if next.is_none() {
break;
}
last_signal = next.unwrap();
}
context.new_path();
context.move_to(0.0, 0.0);
context.line_to(canvas.get_allocated_width() as f64, canvas.get_allocated_height() as f64);
context.stroke();
gtk::Inhibit(false)
});
}
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