From c1673f7b40363f33fe7a1247fa1777b5049da973 Mon Sep 17 00:00:00 2001
From: Rob Watson <rob@rfwatson.net>
Date: Sun, 9 Jun 2019 10:59:40 +0200
Subject: [PATCH] WIP 1: closure inside struct method, borrow checking issues.
About to refactor to use modules.
---
.gitignore | 2 +
Cargo.lock | 693 ++++++++++++++++++++++++++++++++++++++++++++++++++++
Cargo.toml | 13 +
src/main.rs | 117 +++++++++
4 files changed, 825 insertions(+)
create mode 100644 .gitignore
create mode 100644 Cargo.lock
create mode 100644 Cargo.toml
create mode 100644 src/main.rs
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..5790025
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,693 @@
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..fe48286
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "audio-test"
+version = "0.1.0"
+authors = ["Rob Watson <rob@rfwatson.net>"]
+edition = "2018"
+
+[dependencies]
+cpal = "0.8.2"
+sample = "0.10.0"
+
+[dependencies.gtk]
+version = "0.5.0"
+features = ["v3_10"]
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..2cc0c03
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,117 @@
+extern crate cpal;
+extern crate gtk;
+
+use std::thread;
+use std::iter::Iterator;
+use cpal::{EventLoop, StreamData, UnknownTypeInputBuffer, Sample};
+use gtk::prelude::*;
+use gtk::{Button, Window, WindowType};
+
+pub struct Gui {
+ window: gtk::Window
+}
+
+impl Gui {
+ pub fn new() -> Self {
+ let window = Window::new(WindowType::Toplevel);
+ window.set_title("Hello GTK");
+ window.set_default_size(350, 70);
+
+ let button = Button::new_with_label("Click me now");
+ window.add(&button);
+ window.show_all();
+
+ window.connect_delete_event(|_, _| {
+ println!("Bye");
+ gtk::main_quit();
+ Inhibit(false)
+ });
+
+ button.connect_clicked(|_| {
+ println!("Clicked!");
+ });
+
+ Self {
+ window: window
+ }
+ }
+}
+
+struct AudioEngine {
+ event_loop: EventLoop,
+ max_value: i16,
+}
+
+impl AudioEngine {
+ pub fn new() -> Self {
+ AudioEngine {
+ event_loop: EventLoop::new(),
+ max_value: 0
+ }
+ }
+
+ pub fn init(&mut self) -> Result<(), String> {
+ let device = cpal::default_input_device()
+ .ok_or("Could not find a default input device")?;
+ let mut supported_formats_range = device.supported_input_formats()
+ .map_err(|_| "Could not get supported input formats")?;
+ let format = supported_formats_range
+ .next()
+ .ok_or("Could not get supported formats range")?
+ .with_max_sample_rate();
+
+ let stream_id = self.event_loop.build_input_stream(&device, &format)
+ .map_err(|_| "Could not build input stream")?;
+ self.event_loop.play_stream(stream_id);
+
+ Ok(())
+ }
+
+ pub fn run(&mut self) {
+ self.event_loop.run(|_stream_id, stream_data| {
+ match stream_data {
+ StreamData::Input { buffer: UnknownTypeInputBuffer::I16(buffer) } =>
+ self.process_audio(buffer),
+ StreamData::Input { buffer: UnknownTypeInputBuffer::U16(buffer) } =>
+ self.process_audio(buffer),
+ StreamData::Input { buffer: UnknownTypeInputBuffer::F32(buffer) } =>
+ self.process_audio(buffer),
+ _ => unreachable!()
+ }
+ });
+ }
+
+ fn process_audio<T>(&mut self, buffer: cpal::InputBuffer<T>) where T: cpal::Sample {
+ let max = buffer
+ .iter()
+ .map(Sample::to_i16)
+ .max()
+ .unwrap_or(0)
+ .abs();
+
+ if max > self.max_value {
+ println!("new max: {}", max);
+ self.max_value = max;
+ }
+ }
+}
+
+fn main() {
+ // Audio:
+ thread::spawn(move || {
+ let mut audio_engine = AudioEngine::new();
+ audio_engine.init().unwrap_or_else(|err| {
+ panic!("Could not start audio engine: {}", err);
+ });
+
+ audio_engine.run();
+ });
+
+ // GUI
+ if gtk::init().is_err() {
+ panic!("Failed to initialize GTK.");
+ }
+ let _gui = Gui::new();
+
+ gtk::main();
+}