1 files changed, 48 insertions, 0 deletions
diff --git a/src/signal.rs b/src/signal.rs
new file mode 100644
index 0000000..ce1dd78
--- /dev/null
+++ b/src/signal.rs
@@ -0,0 +1,48 @@
+#[derive(Debug, Clone)]
+pub struct Signal {
+    pub samples: Vec<f32>,
+    pub sample_rate: f32
+}
+
+impl Signal {
+    pub fn empty() -> Signal {
+        Signal::default()
+    }
+    
+    pub fn new(samples: &[f32], sample_rate: f32) -> Signal {
+        Signal {
+            samples: Signal::remove_mean_offset(samples),
+            sample_rate: sample_rate
+        }
+    }
+
+    fn remove_mean_offset(samples: &[f32]) -> Vec<f32> {
+        let mean = samples.iter().sum::<f32>()/samples.len() as f32;
+        samples.iter().map(|x| x - mean).collect()
+    }
+
+    pub fn aligned_to_rising_edge(&self) -> &[f32] {
+        let rising_edge = self.samples
+            .iter()
+            .enumerate()
+            .skip_while(|&(_,x)| !x.is_sign_negative())
+            .skip_while(|&(_,x)| x.is_sign_negative())
+            .map(|(i,_)| i)
+            .next().unwrap_or(0);
+        &self.samples[rising_edge..]
+    }
+
+    pub fn is_silence(&self) -> bool {
+        self.samples.iter().all(|&x| x.abs() < 0.05)
+    }
+
+}
+
+impl Default for Signal {
+    fn default() -> Signal {
+        Signal {
+            samples: Vec::new(),
+            sample_rate: 44100.0
+        }
+    }
+}