Adds a RFC 5285 header extension with a two bytes header to the end of the RTP header.
If there is already a RFC 5285 header extension with a two bytes header, the new extension will be appended. It will not work if there is already a header extension that does not follow the mechanism described in RFC 5285 or if there is a header extension with a one byte header as described in RFC 5285. In that case, use add_extension_onebyte_header
| this |
the RTP packet |
| appbits |
Application specific bits |
| id |
The ID of the header extension |
| data |
location for data |
| size |
the size of the data in bytes |
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