Another pointless stuff

Cargo.lock

@@ -86,6 +86,12 @@ dependencies = [
  "windows-sys 0.61.2",
 ]
 
+[[package]]
+name = "anyhow"
+version = "1.0.100"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a23eb6b1614318a8071c9b2521f36b424b2c83db5eb3a0fead4a6c0809af6e61"
+
 [[package]]
 name = "arrayvec"
 version = "0.7.6"
@@ -1028,6 +1034,7 @@ name = "termix"
 version = "0.1.0"
 dependencies = [
  "alsa 0.10.0",
+ "anyhow",
  "clap",
  "coreaudio-rs",
  "cpal",

Cargo.toml

@@ -14,6 +14,7 @@ cpal = { version = "0.16.0", optional = true }
 ringbuf = "0.4.8"
 crossbeam = { version = "0.8.4", features = ["crossbeam-channel"] }
 crossbeam-channel = "0.5.15"
+anyhow = "1.0.100"
 
 [features]
 pulseaudio = ["dep:pulseaudio"]

src/main.rs

@@ -1,49 +1,94 @@
-use std::{io, str::FromStr};
+//! Sine wave generator with frequency configuration exposed through standard
+//! input.
 
-use ringbuf::{
-    traits::{Consumer, Producer, Split},
-    HeapRb,
-};
+use crossbeam_channel::bounded;
+use jack::{AsyncClient, AudioOut, Client, ProcessHandler, ProcessScope};
+use ringbuf::traits::{Consumer, Producer, Split};
+use ringbuf::HeapRb;
+use std::fs::File;
+use std::str::FromStr;
+use std::thread::{self, sleep};
+use std::time::Duration;
+use std::{env, io};
+use symphonia::core::audio::{AudioBufferRef, SampleBuffer, Signal};
+use symphonia::core::codecs::DecoderOptions;
+use symphonia::core::formats::FormatOptions;
+use symphonia::core::io::MediaSourceStream;
+use symphonia::core::meta::MetadataOptions;
+use symphonia::core::probe::Hint;
+use symphonia::core::units::Time;
+const RB_SIZE: usize = 48000 * 2; // ~1 second mono
+                                  //
+                                  //
+fn start_decoder_thread(
+    mut looper: AudioFileLooper,
+    mut producer: impl ringbuf::traits::Producer<Item = f32> + std::marker::Send + 'static,
+) {
+    thread::spawn(move || {
+        loop {
+            let sample = looper.next_sample();
+            let _ = producer.try_push(sample);
+            // Drop if buffer is full (never block)
+        }
+    });
+}
+//
+//
 
-fn main() {
-    /*
-     * Start the JACK backend and make it ready to play sounds
-     *
-     */
-    let (client, _status) =
-        jack::Client::new("rust_jack_sine", jack::ClientOptions::default()).unwrap();
-    let mut out_a = client
-        .register_port("sine_out", jack::AudioOut::default())
-        .unwrap();
-    let rb = HeapRb::<f32>::new(128);
-    let (mut prod, mut cons) = rb.split();
-    let process_callback = move |_: &jack::Client, ps: &jack::ProcessScope| -> jack::Control {
-        let out = out_a.as_mut_slice(ps);
-        let available = cons.pop_slice(out);
-        out[available..].fill(0.0);
-        jack::Control::Continue
-    };
-    let process = jack::contrib::ClosureProcessHandler::new(process_callback);
-
-    let active_client = client.activate_async((), process).unwrap();
-
-    active_client
-        .as_client()
-        .connect_ports_by_name("rust_jack_sine:sine_out", "system:playback_1")
-        .unwrap();
-    active_client
-        .as_client()
-        .connect_ports_by_name("rust_jack_sine:sine_out", "system:playback_2")
-        .unwrap();
-    // processing starts here
-
-    // 5. wait or do some processing while your handler is running in real time.
-    println!("Enter an integer value to change the frequency of the sine wave.");
-    while let Some(f) = read_freq() {
-        println!("Pushing to the prod");
-        prod.try_push(f);
+struct JackHandler<C>
+where
+    C: Consumer<Item = f32>,
+{
+    out: jack::Port<jack::AudioOut>,
+    consumer: C,
 }
 
+impl<C> ProcessHandler for JackHandler<C>
+where
+    C: Consumer<Item = f32> + std::marker::Send,
+{
+    fn process(&mut self, _: &Client, ps: &ProcessScope) -> jack::Control {
+        let buffer = self.out.as_mut_slice(ps);
+
+        for sample in buffer.iter_mut() {
+            *sample = self.consumer.try_pop().unwrap_or(0.0);
+        }
+
+        jack::Control::Continue
+    }
+}
+
+fn main() {
+    let path = env::args()
+        .nth(1)
+        .expect("Usage: cargo run -- <audio_file>");
+    let mut looper = AudioFileLooper::open(&path).expect("Brah");
+    // Ring buffer
+    let rb = HeapRb::<f32>::new(RB_SIZE);
+    let (producer, consumer) = rb.split();
+
+    // Start decoder thread
+    start_decoder_thread(looper, producer);
+    // 1. open a client
+    let (client, _status) =
+        jack::Client::new("rust_jack_sine", jack::ClientOptions::default()).unwrap();
+
+    // 2. register port
+    let out = client
+        .register_port("sine_out", jack::AudioOut::default())
+        .unwrap();
+
+    let handler = JackHandler { out, consumer };
+    let active_client = {
+        let notification_handler = ();
+        AsyncClient::new(client, notification_handler, handler)
+    }
+    .expect("bvrah");
+
+    println!("Running… press Enter to quit");
+    let mut input = String::new();
+    std::io::stdin().read_line(&mut input).unwrap();
+    // 4. Activate the client. Also connect the ports to the system audio.
     // 6. Optional deactivate. Not required since active_client will deactivate on
     // drop, though explicit deactivate may help you identify errors in
     // deactivate.
@@ -52,11 +97,117 @@ fn main() {
     };
 }
 
-fn read_freq() -> Option<f32> {
-    Some(10000.0)
-    //let mut user_input = String::new();
-    //match io::stdin().read_line(&mut user_input) {
-    //    Ok(_) => u16::from_str(user_input.trim()).ok().map(|n| n as f32),
-    //    Err(_) => None,
-    //}
+/// Attempt to read a frequency from standard in. Will block until there is
+/// user input. `None` is returned if there was an error reading from standard
+/// in, or the retrieved string wasn't a compatible u16 integer.
+fn read_freq() -> Option<f64> {
+    let mut user_input = String::new();
+    match io::stdin().read_line(&mut user_input) {
+        Ok(_) => u16::from_str(user_input.trim()).ok().map(|n| n as f64),
+        Err(_) => None,
+    }
+}
+
+pub struct AudioFileLooper {
+    format: Box<dyn symphonia::core::formats::FormatReader>,
+    decoder: Box<dyn symphonia::core::codecs::Decoder>,
+    track_id: u32,
+
+    sample_buf: Vec<f32>,
+    sample_pos: usize,
+}
+impl AudioFileLooper {
+    pub fn open(path: &str) -> Result<Self, symphonia::core::errors::Error> {
+        let file = File::open(path)?;
+        let mss = MediaSourceStream::new(Box::new(file), Default::default());
+
+        let mut hint = Hint::new();
+        if let Some(ext) = path.split('.').last() {
+            hint.with_extension(ext);
+        }
+
+        let format = symphonia::default::get_probe()
+            .format(
+                &hint,
+                mss,
+                &FormatOptions::default(),
+                &MetadataOptions::default(),
+            )?
+            .format;
+
+        let track = format
+            .tracks()
+            .iter()
+            .find(|t| t.codec_params.sample_rate.is_some())
+            .unwrap();
+        let track_id = track.id;
+
+        let decoder = symphonia::default::get_codecs()
+            .make(&track.codec_params, &DecoderOptions::default())?;
+
+        Ok(Self {
+            format,
+            decoder,
+            track_id: track_id,
+            sample_buf: Vec::new(),
+            sample_pos: 0,
+        })
+    }
+    fn refill_samples(&mut self) -> Result<(), symphonia::core::errors::Error> {
+        self.sample_buf.clear();
+        self.sample_pos = 0;
+
+        loop {
+            match self.format.next_packet() {
+                Ok(packet) => {
+                    if packet.track_id() != self.track_id {
+                        continue;
+                    }
+
+                    let decoded = self.decoder.decode(&packet)?;
+
+                    match decoded {
+                        AudioBufferRef::F32(buf) => {
+                            self.sample_buf.extend_from_slice(buf.chan(0));
+                        }
+
+                        _ => {
+                            let mut sample_buffer = SampleBuffer::<f32>::new(
+                                decoded.capacity() as u64,
+                                *decoded.spec(),
+                            );
+                            sample_buffer.copy_interleaved_ref(decoded);
+                            self.sample_buf.extend_from_slice(sample_buffer.samples());
+                        }
+                    }
+
+                    return Ok(());
+                }
+
+                Err(symphonia::core::errors::Error::IoError(_)) => {
+                    // EOF → loop
+                    self.format.seek(
+                        symphonia::core::formats::SeekMode::Accurate,
+                        symphonia::core::formats::SeekTo::Time {
+                            time: Time::new(0, 0.0),
+                            track_id: Some(self.track_id),
+                        },
+                    )?;
+                }
+
+                Err(e) => return Err(e),
+            }
+        }
+    }
+    pub fn next_sample(&mut self) -> f32 {
+        if self.sample_pos >= self.sample_buf.len() {
+            if self.refill_samples().is_err() {
+                return 0.0;
+            }
+        }
+
+        let sample = self.sample_buf[self.sample_pos];
+        self.sample_pos += 1;
+        sample
+    }
 }