virtual device input output

src/device/virtual_device.rs

@@ -32,4 +32,35 @@ impl VirtualDevice {
         self.output_index.push(self.get_min_index());
         self.output_index.len() - 1
     }
+
+    pub fn take_output(&mut self, index: usize, channel: u8, take_size: usize) -> Option<Vec<f64>> {
+        let mut buffer = Vec::with_capacity(take_size);
+        let start = self.output_index[index];
+        let end = start + take_size;
+
+        if end > self.output_buffer[channel as usize].len() {
+            return None;
+        }
+
+        for i in start..end {
+            buffer.push(self.output_buffer[channel as usize][i]);
+        }
+        self.output_index[index] = end;
+
+        let min = self.get_min_index();
+        if min != 0 {
+            for i in 0..self.channels as usize {
+                self.output_buffer[i].drain(0..min);
+            }
+            for i in 0..self.output_index.len() {
+                self.output_index[i] -= min;
+            }
+        }
+
+        Some(buffer)
+    }
+
+    pub fn write_input(&mut self, channel: u8, buffer: Vec<f64>) {
+        self.output_buffer[channel as usize].extend(buffer);
+    }
 }