feat: added crude file source, gated pulseaudio

now requires feature pulseaudio to build libpulse and pulse source. file
source is always included. the cli got reworked a little bit but I'm not
sure I like it this way, we'll see

Cargo.toml

@@ -3,8 +3,8 @@ name = "scope-tui"
 version = "0.3.0"
 edition = "2021"
 authors = [ "alemi <me@alemi.dev>" ]
-description = "A simple oscilloscope/vectorscope for the terminal, inspired by cava"
-keywords = ["tui", "terminal", "audio", "visualization", "scope", "dashboard"]
+description = "A simple oscilloscope/vectorscope/spectroscope for your terminal"
+keywords = ["tui", "terminal", "audio", "visualization", "scope", "dashboard", "oscilloscope", "spectroscope"]
 repository = "https://github.com/alemidev/scope-tui"
 readme = "README.md"
 # documentation =
@@ -12,11 +12,18 @@ readme = "README.md"
 
 
 [dependencies]
-ratatui = { version = "0.23.0", features = ["all-widgets"] }
-crossterm = "0.25"
-libpulse-binding = "2.0"
-libpulse-simple-binding = "2.25"
 clap = { version = "4.0.32", features = ["derive"] }
 derive_more = "0.99.17"
 thiserror = "1.0.48"
 rustfft = "6.1.0"
+# for TUI backend
+ratatui = { version = "0.23.0", features = ["all-widgets"], optional = true }
+crossterm = { version = "0.25", optional = true }
+# for pulseaudio
+libpulse-binding = { version = "2.0", optional = true }
+libpulse-simple-binding = { version = "2.25", optional = true }
+
+[features]
+default    = ["tui"]
+tui        = ["dep:ratatui", "dep:crossterm"]
+pulseaudio = ["dep:libpulse-binding", "dep:libpulse-simple-binding"]

src/app.rs

@@ -27,8 +27,9 @@ pub struct App {
 	mode: CurrentDisplayMode,
 }
 
-impl From::<&crate::Args> for App {
-	fn from(args: &crate::Args) -> Self {
+// TODO another way to build this that doesn't require getting cli args directly!!!
+impl From::<&crate::ScopeArgs> for App {
+	fn from(args: &crate::ScopeArgs) -> Self {
 		let graph = GraphConfig {
 			axis_color: Color::DarkGray,
 			labels_color: Color::Cyan,
@@ -36,6 +37,7 @@ impl From::<&crate::Args> for App {
 			scale: args.range,
 			width: args.buffer / (2 * args.channels as u32), // TODO also make bit depth customizable
 			samples: args.buffer / (2 * args.channels as u32),
+			sampling_rate: args.sample_rate,
 			references: !args.no_reference,
 			show_ui: !args.no_ui,
 			scatter: args.scatter,
@@ -46,21 +48,9 @@ impl From::<&crate::Args> for App {
 			},
 		};
 
-		let oscilloscope = Oscilloscope {
-			triggering: args.triggering,
-			depth: args.check_depth,
-			threshold: args.threshold,
-			falling_edge: args.falling_edge,
-			peaks: args.show_peaks,
-		};
-
-		let vectorscope = Vectorscope::default();
-		let spectroscope = Spectroscope {
-			sampling_rate: args.sample_rate,
-			buffer_size: graph.width,
-			average: 1,
-			buf: Vec::new(),
-		};
+		let oscilloscope = Oscilloscope::from_args(args);
+		let vectorscope = Vectorscope::from_args(args);
+		let spectroscope = Spectroscope::from_args(args);
 
 		App { 
 			graph, oscilloscope, vectorscope, spectroscope,
@@ -72,7 +62,7 @@ impl From::<&crate::Args> for App {
 }
 
 impl App {
-	pub fn run<T : Backend>(&mut self, mut source: impl DataSource, terminal: &mut Terminal<T>) -> Result<(), io::Error> {
+	pub fn run<T : Backend>(&mut self, mut source: Box<dyn DataSource>, terminal: &mut Terminal<T>) -> Result<(), io::Error> {
 		// prepare globals
 		let fmt = Signed16PCM{}; // TODO some way to choose this?
 	
@@ -82,7 +72,8 @@ impl App {
 		let mut channels = vec![];
 	
 		loop {
-			let data = source.recv().unwrap();
+			let data = source.recv()
+				.ok_or(io::Error::new(io::ErrorKind::BrokenPipe, "data source returned null"))?;
 	
 			if !self.pause {
 				channels = fmt.oscilloscope(data, self.channels);

src/display/mod.rs

@@ -12,6 +12,7 @@ pub enum Dimension {
 #[derive(Debug, Clone)]
 pub struct GraphConfig {
 	pub samples: u32,
+	pub sampling_rate: u32,
 	pub scale: u32,
 	pub width: u32,
 	pub scatter: bool,
@@ -32,6 +33,7 @@ impl GraphConfig {
 #[allow(clippy::ptr_arg)] // TODO temporarily! it's a shitty solution
 pub trait DisplayMode {
 	// MUST define
+	fn from_args(args: &crate::ScopeArgs) -> Self where Self : Sized;
 	fn axis(&self, cfg: &GraphConfig, dimension: Dimension) -> Axis; // TODO simplify this
 	fn process(&mut self, cfg: &GraphConfig, data: &Vec<Vec<f64>>) -> Vec<DataSet>;
 	fn mode_str(&self) -> &'static str;

src/display/oscilloscope.rs

@@ -15,6 +15,10 @@ pub struct Oscilloscope {
 }
 
 impl DisplayMode for Oscilloscope {
+	fn from_args(_args: &crate::ScopeArgs) -> Self {
+		Oscilloscope::default()
+	}
+
 	fn mode_str(&self) -> &'static str {
 		"oscillo"
 	}

src/display/spectroscope.rs

@@ -23,6 +23,14 @@ fn complex_to_magnitude(c: Complex<f64>) -> f64 {
 }
 
 impl DisplayMode for Spectroscope {
+	fn from_args(args: &crate::ScopeArgs) -> Self {
+		Spectroscope {
+			sampling_rate: args.sample_rate,
+			buffer_size: args.buffer / (2 * args.channels as u32),
+			average: 1, buf: Vec::new(),
+		}
+	}
+
 	fn mode_str(&self) -> &'static str {
 		"spectro"
 	}
@@ -61,6 +69,7 @@ impl DisplayMode for Spectroscope {
 	}
 
 	fn process(&mut self, cfg: &GraphConfig, data: &Vec<Vec<f64>>) -> Vec<DataSet> {
+		if self.average == 0 { self.average = 1 } // otherwise fft breaks
 		for (i, chan) in data.iter().enumerate() {
 			if self.buf.len() <= i {
 				self.buf.push(VecDeque::new());

src/display/vectorscope.rs

@@ -6,6 +6,10 @@ use super::{DisplayMode, GraphConfig, DataSet, Dimension};
 pub struct Vectorscope {}
 
 impl DisplayMode for Vectorscope {
+	fn from_args(_args: &crate::ScopeArgs) -> Self {
+		Vectorscope::default()
+	}
+
 	fn mode_str(&self) -> &'static str {
 		"vector"
 	}

src/main.rs

@@ -5,7 +5,6 @@ mod source;
 mod display;
 
 use app::App;
-use source::PulseAudioSimple;
 use ratatui::{
 	backend::CrosstermBackend,
 	Terminal,
@@ -16,7 +15,7 @@ use crossterm::{
 	},
 };
 
-use clap::Parser;
+use clap::{Parser, Subcommand};
 
 use crate::music::Note;
 
@@ -29,80 +28,73 @@ const HELP_TEMPLATE : &str = "{before-help}\
 {all-args}{after-help}
 ";
 
-/// A simple oscilloscope/vectorscope for your terminal
+/// a simple oscilloscope/vectorscope for your terminal
 #[derive(Parser, Debug)]
 #[command(author, version, about, long_about = None, help_template = HELP_TEMPLATE)]
-pub struct Args {
-	/// Audio device to attach to
-	device: Option<String>,
+pub struct ScopeArgs {
+	#[clap(subcommand)]
+	source: ScopeSource,
 
-	/// Size of audio buffer, and width of scope
-	#[arg(short, long, value_name = "SIZE", default_value_t = 8192)]
-	buffer: u32,
-
-	/// Max value, positive and negative, on amplitude scale
-	#[arg(short, long, value_name = "SIZE", default_value_t = 20000)]
-	range: u32, // TODO counterintuitive, improve this
-
-	/// Use vintage looking scatter mode instead of line mode
-	#[arg(long, default_value_t = false)]
-	scatter: bool,
-
-	/// Combine left and right channels into vectorscope view
-	#[arg(long, default_value_t = false)]
-	vectorscope: bool,
-
-	/// Show peaks for each channel as dots
-	#[arg(long, default_value_t = true)]
-	show_peaks: bool,
-
-	/// Tune buffer size to be in tune with given note (overrides buffer option)
-	#[arg(long, value_name = "NOTE")]
-	tune: Option<String>,
-
-	/// Number of channels to open
+	/// number of channels to open
 	#[arg(long, value_name = "N", default_value_t = 2)]
 	channels: u8,
 
-	/// Sample rate to use
+	/// tune buffer size to be in tune with given note (overrides buffer option)
+	#[arg(long, value_name = "NOTE")]
+	tune: Option<String>,
+
+	/// size of audio buffer, and width of scope
+	#[arg(short, long, value_name = "SIZE", default_value_t = 8192)]
+	buffer: u32,
+
+	/// sample rate to use
 	#[arg(long, value_name = "HZ", default_value_t = 44100)]
 	sample_rate: u32,
 
-	/// Pulseaudio server buffer size, in block number
-	#[arg(long, value_name = "N", default_value_t = 32)]
-	server_buffer: u32,
+	/// max value, positive and negative, on amplitude scale
+	#[arg(short, long, value_name = "SIZE", default_value_t = 20000)]
+	range: u32, // TODO counterintuitive, improve this
 
-	/// Start drawing at first rising edge
+	/// use vintage looking scatter mode instead of line mode
 	#[arg(long, default_value_t = false)]
-	triggering: bool,
+	scatter: bool,
 
-	/// Threshold value for triggering
-	#[arg(long, value_name = "VAL", default_value_t = 0.0)]
-	threshold: f64,
-
-	/// Length of trigger check in samples
-	#[arg(long, value_name = "SMPL", default_value_t = 1)]
-	check_depth: u32,
-
-	/// Trigger upon falling edge instead of rising
-	#[arg(long, default_value_t = false)]
-	falling_edge: bool,
-
-	/// Don't draw reference line
+	/// don't draw reference line
 	#[arg(long, default_value_t = false)]
 	no_reference: bool,
 
-	/// Hide UI and only draw waveforms
+	/// hide UI and only draw waveforms
 	#[arg(long, default_value_t = false)]
 	no_ui: bool,
 
-	/// Don't use braille dots for drawing lines
+	/// don't use braille dots for drawing lines
 	#[arg(long, default_value_t = false)]
 	no_braille: bool,
 }
 
-fn main() -> Result<(), std::io::Error> {
-	let mut args = Args::parse();
+#[derive(Debug, Clone, Subcommand)]
+pub enum ScopeSource {
+
+	#[cfg(feature = "pulseaudio")]
+	/// use PulseAudio Simple api to read data from an audio sink
+	Pulse {
+		/// source device to attach to
+		device: Option<String>,
+
+		/// PulseAudio server buffer size, in block number
+		#[arg(long, value_name = "N", default_value_t = 32)]
+		server_buffer: u32,
+	},
+
+	/// use a file from filesystem and read its content
+	File {
+		/// path on filesystem of file or pipe
+		path: String,
+	},
+}
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+	let mut args = ScopeArgs::parse();
 
 	if let Some(txt) = &args.tune { // TODO make it less jank
 		if let Ok(note) = txt.parse::<Note>() {
@@ -115,13 +107,24 @@ fn main() -> Result<(), std::io::Error> {
 		}
 	}
 
-	let source = PulseAudioSimple::new(
-		args.device.as_deref(),
-		args.channels,
-		args.sample_rate,
-		args.buffer,
-		args.server_buffer
-	).unwrap();
+	let source = match &args.source {
+
+		#[cfg(feature = "pulseaudio")]
+		ScopeSource::Pulse { device, server_buffer } => {
+			source::pulseaudio::PulseAudioSimpleDataSource::new(
+				device.as_deref(),
+				args.channels,
+				args.sample_rate,
+				args.buffer,
+				*server_buffer,
+			)?
+		},
+
+		ScopeSource::File { path } => {
+			source::file::FileSource::new(path, args.buffer)?
+		},
+
+	};
 
 	let mut app = App::from(&args);
 
@@ -143,11 +146,9 @@ fn main() -> Result<(), std::io::Error> {
 	)?;
 	terminal.show_cursor()?;
 
-	match res {
-		Ok(()) => Ok(()),
-		Err(e) => {
-			eprintln!("[!] Error executing app: {:?}", e);
-			Err(e)
-		}
+	if let Err(e) = res {
+		eprintln!("[!] Error executing app: {:?}", e);
 	}
+
+	Ok(())
 }

src/source.rs

@@ -1,53 +1,88 @@
-use libpulse_binding::{sample::{Spec, Format}, def::BufferAttr, error::PAErr, stream::Direction};
-use libpulse_simple_binding::Simple;
-
 pub trait DataSource {
 	fn recv(&mut self) -> Option<&[u8]>; // TODO convert in Result and make generic error
 }
 
-pub struct PulseAudioSimple {
-	simple: Simple,
-	buffer: Vec<u8>,
-}
+pub mod file {
+	use std::{fs::File, io::Read};
 
-impl PulseAudioSimple {
-	pub fn new(
-		device: Option<&str>, channels: u8, rate: u32, buffer: u32, server_buffer: u32
-	) -> Result<Self, PAErr> {
-		let spec = Spec {
-			format: Format::S16NE, // TODO allow more formats?
-			channels, rate,
-		};
-		if !spec.is_valid() {
-			return Err(PAErr(0)); // TODO what error number should we throw?
-		}
-		let attrs = BufferAttr {
-			maxlength: server_buffer * buffer,
-			fragsize: buffer,
-			..Default::default()
-		};
-		let simple = Simple::new(
-			None,                // Use the default server
-			"scope-tui",         // Our application’s name
-			Direction::Record,   // We want a record stream
-			device,              // Use requested device, or default
-			"data",              // Description of our stream
-			&spec,               // Our sample format
-			None,                // Use default channel map
-			Some(&attrs),        // Our hints on how to handle client/server buffers
-		)?;
-		Ok(Self { simple, buffer: vec![0; buffer as usize] })
+	pub struct FileSource {
+		file: File,
+		buffer: Vec<u8>,
 	}
-}
 
-impl DataSource for PulseAudioSimple {
-	fn recv(&mut self) -> Option<&[u8]> {
-		match self.simple.read(&mut self.buffer) {
-			Ok(()) => Some(&self.buffer),
-			Err(e) => {
-				eprintln!("[!] could not receive from pulseaudio: {}", e);
-				None
+	impl FileSource {
+		#[allow(clippy::new_ret_no_self)]
+		pub fn new(path: &str, buffer: u32) -> Result<Box<dyn super::DataSource>, std::io::Error> {
+			Ok(Box::new(
+				FileSource {
+					file: File::open(path)?,
+					buffer: vec![0u8; buffer as usize],
+				}
+			))
+		}
+	}
+
+	impl super::DataSource for FileSource {
+		fn recv(&mut self) -> Option<&[u8]> {
+			match self.file.read_exact(&mut self.buffer) {
+				Ok(()) => Some(self.buffer.as_slice()),
+				Err(_e) => None, // TODO log it
 			}
 		}
 	}
 }
+
+#[cfg(feature = "pulseaudio")]
+pub mod pulseaudio {
+	use libpulse_binding::{sample::{Spec, Format}, def::BufferAttr, error::PAErr, stream::Direction};
+	use libpulse_simple_binding::Simple;
+
+	pub struct PulseAudioSimpleDataSource {
+		simple: Simple,
+		buffer: Vec<u8>,
+	}
+	
+	impl PulseAudioSimpleDataSource {
+		#[allow(clippy::new_ret_no_self)]
+		pub fn new(
+			device: Option<&str>, channels: u8, rate: u32, buffer: u32, server_buffer: u32
+		) -> Result<Box<dyn super::DataSource>, PAErr> {
+			let spec = Spec {
+				format: Format::S16NE, // TODO allow more formats?
+				channels, rate,
+			};
+			if !spec.is_valid() {
+				return Err(PAErr(0)); // TODO what error number should we throw?
+			}
+			let attrs = BufferAttr {
+				maxlength: server_buffer * buffer,
+				fragsize: buffer,
+				..Default::default()
+			};
+			let simple = Simple::new(
+				None,                // Use the default server
+				"scope-tui",         // Our application’s name
+				Direction::Record,   // We want a record stream
+				device,              // Use requested device, or default
+				"data",              // Description of our stream
+				&spec,               // Our sample format
+				None,                // Use default channel map
+				Some(&attrs),        // Our hints on how to handle client/server buffers
+			)?;
+			Ok(Box::new(Self { simple, buffer: vec![0; buffer as usize] }))
+		}
+	}
+	
+	impl super::DataSource for PulseAudioSimpleDataSource {
+		fn recv(&mut self) -> Option<&[u8]> {
+			match self.simple.read(&mut self.buffer) {
+				Ok(()) => Some(&self.buffer),
+				Err(e) => {
+					eprintln!("[!] could not receive from pulseaudio: {}", e);
+					None
+				}
+			}
+		}
+	}
+
+}