Add example of sample playback

Author: gridbugs

caw/Cargo.toml

@@ -38,6 +38,7 @@ caw_interactive = { version = "0.3", path = "../interactive", optional = true }
 anyhow = "1.0"
 rand = "0.8"
 env_logger = "0.11"
+clap = { version = "4", features = ["derive"] }
 
 [[example]]
 name = "electric_organ_menu"
@@ -58,3 +59,7 @@ required-features = [ "interactive" ]
 [[example]]
 name = "simple"
 required-features = [ "interactive" ]
+
+[[example]]
+name = "audio_file_playback"
+required-features = [ "interactive", "audio_file" ]

caw/examples/audio_file_playback.rs

@@ -0,0 +1,36 @@
+use caw::prelude::*;
+use clap::Parser;
+
+fn sig(
+    _input: Input,
+    audio_file_buf: Vec<f32>,
+    _channel: Channel,
+) -> Sig<impl SigT<Item = f32>> {
+    sample_playback(audio_file_buf).build()
+}
+
+#[derive(Parser, Debug)]
+struct Args {
+    wav_path: String,
+}
+
+fn main() -> anyhow::Result<()> {
+    env_logger::init();
+    let args = Args::parse();
+    let window = Window::builder()
+        .sane_default()
+        .visualization(Visualization::StereoOscillographics)
+        .line_width(2)
+        .stride(4)
+        .fade(true)
+        .build();
+    let input = window.input();
+    let audio_file_buf = read_wav_stereo(args.wav_path)?;
+    window.play_stereo(
+        Stereo::new(
+            sig(input.clone(), audio_file_buf.left, Channel::Left),
+            sig(input.clone(), audio_file_buf.right, Channel::Right),
+        ),
+        Default::default(),
+    )
+}