feat: add stream filter

src/model/ordering.rs

@@ -0,0 +1,47 @@
+use std::cmp::Ordering;
+
+use crate::model::AudioCodec;
+
+use super::{AudioStream, VideoStream};
+
+impl PartialOrd for VideoStream {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        Some(
+            match (self.width * self.height).cmp(&(other.width * other.height)) {
+                Ordering::Less => Ordering::Less,
+                Ordering::Greater => Ordering::Greater,
+                Ordering::Equal => match self.codec.cmp(&other.codec) {
+                    Ordering::Less => Ordering::Less,
+                    Ordering::Greater => Ordering::Greater,
+                    Ordering::Equal => self.average_bitrate.cmp(&other.average_bitrate),
+                },
+            },
+        )
+    }
+}
+
+impl Ord for VideoStream {
+    fn cmp(&self, other: &Self) -> Ordering {
+        self.partial_cmp(other).unwrap()
+    }
+}
+
+impl PartialOrd for AudioStream {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        fn cmp_bitrate(s: &AudioStream) -> u32 {
+            match s.codec {
+                // Opus is more efficient
+                AudioCodec::Opus => (s.average_bitrate as f32 * 1.3) as u32,
+                _ => s.average_bitrate,
+            }
+        }
+
+        Some(cmp_bitrate(self).cmp(&cmp_bitrate(other)))
+    }
+}
+
+impl Ord for AudioStream {
+    fn cmp(&self, other: &Self) -> Ordering {
+        self.partial_cmp(other).unwrap()
+    }
+}