Creates a stream-id for the source GstPad pad by combining the
upstream information with the optional stream_id of the stream
of pad. pad must have a parent GstElement and which must have zero
or one sinkpad. stream_id can only be NULL if the parent element
of pad has only a single source pad.
This function generates an unique stream-id by getting the upstream
stream-start event stream ID and appending stream_id to it. If the
element has no sinkpad it will generate an upstream stream-id by
doing an URI query on the element and in the worst case just uses
a random number. Source elements that don't implement the URI
handler interface should ideally generate a unique, deterministic
stream-id manually instead.
Creates a stream-id for the source GstPad pad by combining the upstream information with the optional stream_id of the stream of pad. pad must have a parent GstElement and which must have zero or one sinkpad. stream_id can only be NULL if the parent element of pad has only a single source pad. This function generates an unique stream-id by getting the upstream stream-start event stream ID and appending stream_id to it. If the element has no sinkpad it will generate an upstream stream-id by doing an URI query on the element and in the worst case just uses a random number. Source elements that don't implement the URI handler interface should ideally generate a unique, deterministic stream-id manually instead.