[FFmpeg-devel] [PATCH 1/2] avformat/rtp: add localaddr for network interface selection

[Martin Storsjö]

On Thu, 25 Nov 2021, lance.lmwang at gmail.com wrote:

> From: Limin Wang <lance.lmwang at gmail.com>
>
> Signed-off-by: Limin Wang <lance.lmwang at gmail.com>
> ---
> doc/protocols.texi     |  4 ++++
> libavformat/rtpproto.c | 17 ++++++++++++++---
> libavformat/rtsp.c     |  3 +++
> libavformat/rtsp.h     |  1 +
> 4 files changed, 22 insertions(+), 3 deletions(-)
>
> diff --git a/doc/protocols.texi b/doc/protocols.texi
> index c100f23..d207df0 100644
> --- a/doc/protocols.texi
> +++ b/doc/protocols.texi
> @@ -1087,6 +1087,10 @@ set to 1) or to a default remote address (if set to 0).
> @item localport=@var{n}
> Set the local RTP port to @var{n}.
>
> + at item localaddr=@var{addr}
> +Local IP address of a network interface used for sending packets or joining
> +multicast groups.

Just to clarify things for myself for understanding this: Today, if 
receiving UDP unicast, we can use udp://<localip>:<port> to select which 
local IP address to listen on? But for multicast, we'd do 
udp://<multicast-ip>:<port>?localaddr=<localip> to select which address to 
use for joining the group?

// Martin