15         let mut m = HashMap::new();  localVariable
16         m.insert(RtspCodecId::H264, "h264");
17         m.insert(RtspCodecId::H265, "h265");
18         m.insert(RtspCodecId::AAC, "mpeg4-generic");
19         m.insert(RtspCodecId::G711A, "pcma");
20         m
23         let mut m = HashMap::new();  localVariable
24         m.insert("h264", RtspCodecId::H264);
25         m.insert("h265", RtspCodecId::H265);
26         m.insert("mpeg4-generic", RtspCodecId::AAC);
27         m.insert("pcma", RtspCodecId::G711A);
28         m