Allocate a new #GstBuffer with enough data to hold an RTP packet with
minimum csrc_count CSRCs, a payload length of payload_len and padding of
pad_len. If payload has #GstRTPBasePayload:source-info true additional
CSRCs may be allocated and filled with RTP source information.
Allocate a new #GstBuffer with enough data to hold an RTP packet with minimum csrc_count CSRCs, a payload length of payload_len and padding of pad_len. If payload has #GstRTPBasePayload:source-info true additional CSRCs may be allocated and filled with RTP source information.