104 lines
2.2 KiB
Rust
104 lines
2.2 KiB
Rust
// vim: noet
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use std::process::exit;
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use std::collections::VecDeque;
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use byteorder::{NativeEndian, ReadBytesExt};
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mod signal_processing;
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mod config;
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mod userscript;
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use crate::signal_processing::SignalProcessing;
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use crate::userscript::UserScript;
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use std::rc::Rc;
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use std::cell::RefCell;
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fn main()
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{
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let mut stdin = std::io::stdin();
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// set up signal processing
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println!("Initializing signal processing...");
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let sigproc = Rc::new(RefCell::new(
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SignalProcessing::new(config::BLOCK_LEN, config::SAMP_RATE).unwrap()));
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// set up Lua environment
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println!("Loading user script...");
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let script = match UserScript::new(sigproc.clone(), "test.lua") {
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Ok(script) => script,
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Err(e) => {
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println!("=== Lua Error ===\n{}\n====> Terminating.", e);
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exit(1);
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}
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};
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println!("Calling init()...");
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match script.init() {
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Ok(_) => (),
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Err(e) => {
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println!("=== Lua Error ===\n{}\n====> Terminating.", e);
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exit(1);
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}
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};
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println!("Done! Starting main loop…");
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// array for samples directly read from stream
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let mut samples: VecDeque<i16> = VecDeque::with_capacity(config::BLOCK_LEN);
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// main loop
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loop {
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// read a block of samples and exit gracefully on EOF
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for _i in 0 .. config::SAMPLES_PER_UPDATE {
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// avoid increasing the size of the deque
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if samples.len() == config::BLOCK_LEN {
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samples.pop_front();
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}
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// read a sample from the input
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let res = stdin.read_i16::<NativeEndian>();
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// if everything is ok, append it to the samples deque
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match res {
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Ok(s) => samples.push_back(s),
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Err(e) if e.kind() == std::io::ErrorKind::UnexpectedEof => {
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println!("End of stream. Exiting.");
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exit(0);
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},
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Err(e) => panic!(e)
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}
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}
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// only run calculations if the deque has been filled enough
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if samples.len() < config::BLOCK_LEN {
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continue;
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}
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// run the signal processing
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{
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let mut s = sigproc.borrow_mut();
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s.import_i16_mono_from_iter(samples.iter()).unwrap();
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s.update_fft().unwrap();
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}
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// call the periodic function in the user script
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match script.periodic() {
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Ok(_) => (),
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Err(e) => {
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println!("=== Lua Error ===\n{}\n====> Terminating.", e);
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exit(1);
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}
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};
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}
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}
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