[MPlayer-dev-eng] [PATCH] Support source specific multicast

[Jerome Duval]

Hello,
The attached patch implements support for source specific multicast with the following syntax: udp://source_ip@multicast_address. The original multicast code uses IP_ADD_GROUP, so I stuck with that instead of using MCAST_JOIN_GROUP.

The patch also slightly modifies the url parsing to code to not actually create an empty string username when a url like udp://@multicast_address is passed. It also adds a sourcename pointer to the Url_t structure.

Jerome
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