sdp: use rust join

It is much faster as it does not do an allocation for each element

diff --git a/rust/src/sdp/parser.rs b/rust/src/sdp/parser.rs
index 3ab9d932ca9f3e2039e6c9da9a9b808f383fe4b0..105bc51f6c288c9ed186ee7d44f5123226d1a561 100644 (file)
--- a/rust/src/sdp/parser.rs
+++ b/rust/src/sdp/parser.rs
@@ -464,9 +464,9 @@ fn parse_media_description(i: &[u8]) -> IResult<&[u8], MediaDescription> {
         format!("{}", port)
     };
     let mut media_str = format!("{} {} {}", &media, &port, &proto);
-    let fmt: Vec<String> = fmt.into_iter().map(String::from).collect();
-    for f in &fmt {
-        media_str = format!("{} {}", media_str, f);
+    if !fmt.is_empty() {
+        let fmt: Vec<String> = fmt.into_iter().map(String::from).collect();
+        media_str = format!("{} {}", media_str, fmt.join(" "));
     }
     Ok((
         i,