add playout service: HLS streaming, FFmpeg, SegmentStore port (#9)

crates/playout/src/config.rs

@@ -0,0 +1,34 @@
+use std::path::PathBuf;
+
+#[derive(Debug, Clone)]
+pub struct PlayoutConfig {
+    pub listen_addr: String,
+    pub segment_duration_secs: u32,
+    pub window_size: usize,
+    pub storage_path: PathBuf,
+    pub tick_interval_ms: u64,
+}
+
+impl PlayoutConfig {
+    pub fn from_env() -> Self {
+        Self {
+            listen_addr: std::env::var("PLAYOUT_LISTEN_ADDR")
+                .unwrap_or_else(|_| "0.0.0.0:9090".into()),
+            segment_duration_secs: std::env::var("PLAYOUT_SEGMENT_DURATION")
+                .ok()
+                .and_then(|v| v.parse().ok())
+                .unwrap_or(6),
+            window_size: std::env::var("PLAYOUT_WINDOW_SIZE")
+                .ok()
+                .and_then(|v| v.parse().ok())
+                .unwrap_or(10),
+            storage_path: std::env::var("PLAYOUT_STORAGE_PATH")
+                .map(PathBuf::from)
+                .unwrap_or_else(|_| PathBuf::from("/tmp/k-tv-playout")),
+            tick_interval_ms: std::env::var("PLAYOUT_TICK_INTERVAL_MS")
+                .ok()
+                .and_then(|v| v.parse().ok())
+                .unwrap_or(1000),
+        }
+    }
+}