fix: serialize all rtp, rtcp_fb and fmtp entrys

src/attributes/rtpmap.rs

@@ -127,6 +127,14 @@ fn test_rtpmap_line() {
     assert_line_print!(rtpmap_line, "a=rtpmap:127 red/90000");
     assert_line_print!(rtpmap_line, "a=rtpmap:123 rtx/90000");
     assert_line_print!(rtpmap_line, "a=rtpmap:125 ulpfec/90000");
+    assert_line!(rtpmap_line, "a=rtpmap:122 red/90000",
+        RtpMap {
+            payload: 122,
+            encoding_name: "red".into(),
+            clock_rate: Some(90_000),
+            encoding: None,
+        }
+,print);
     assert_line!(
         rtpmap_line,
         "a=rtpmap:113 telephone-event/16000",

src/lines/media.rs

@@ -9,6 +9,7 @@ use crate::parsers::*;
 #[cfg(test)]
 use crate::{assert_line, assert_line_print};
 
+/// [RFC4566#5.14](https://datatracker.ietf.org/doc/html/rfc4566#section-5.14)
 #[derive(Clone, IntoOwned, PartialEq)]
 #[cfg_attr(feature = "debug", derive(Debug))]
 #[cfg_attr(
@@ -31,7 +32,7 @@ pub fn media_line(input: &str) -> IResult<&str, Media> {
                 wsf(cowify(read_string)),         // type
                 wsf(read_number),                 // port
                 wsf(slash_separated_cow_strings), // protocol
-                wsf(read_as_cow_strings),         //payloads
+                wsf(read_as_cow_strings),         // payloads
             )),
             |(r#type, port, protocol, payloads)| Media {
                 r#type,

src/udisplay.rs

@@ -110,14 +110,43 @@ impl ufmt::uDisplay for MediaSection<'_> {
             uwriteln!(f, "{}", rtcp_option)?;
         }
 
-        for payload in self.payloads.iter().filter_map(|p| p.parse::<u32>().ok()) {
-            for rtp in self.rtp_map.iter().filter(|r| r.payload == payload) {
+        let known_payloads = self
+            .payloads
+            .iter()
+            .filter_map(|p| p.parse::<u32>().ok())
+            .collect::<Vec<_>>();
+
+        for payload in &known_payloads {
+            for rtp in self.rtp_map.iter().filter(|r| r.payload == *payload) {
                 uwriteln!(f, "{}", rtp)?;
             }
-            for rtcp_fb in self.rtcp_fb.iter().filter(|r| r.payload == payload) {
+            for rtcp_fb in self.rtcp_fb.iter().filter(|r| r.payload == *payload) {
                 uwriteln!(f, "{}", rtcp_fb)?;
             }
-            for fmtp in self.fmtp.iter().filter(|r| r.payload == payload) {
+            for fmtp in self.fmtp.iter().filter(|r| r.payload == *payload) {
+                uwriteln!(f, "{}", fmtp)?;
+            }
+        } // one more round for those not listed in the fmt field
+        {
+            for rtp in self
+                .rtp_map
+                .iter()
+                .filter(|r| !known_payloads.contains(&r.payload))
+            {
+                uwriteln!(f, "{}", rtp)?;
+            }
+            for rtcp_fb in self
+                .rtcp_fb
+                .iter()
+                .filter(|r| !known_payloads.contains(&r.payload))
+            {
+                uwriteln!(f, "{}", rtcp_fb)?;
+            }
+            for fmtp in self
+                .fmtp
+                .iter()
+                .filter(|r| !known_payloads.contains(&r.payload))
+            {
                 uwriteln!(f, "{}", fmtp)?;
             }
         }