Of course the spec is always best, but the sprop-parameter-sets in the SDP generally consist of your sequence parameter and picture parameter sets, base-64 encoded and delimited by a comma. The sequence parameter and picture parameter sets basically tell the decoder how to properly decoding the incoming H264 stream; without it you cannot decode correctly.
Writing a parser for SPS/PPS isn't that hard, although to do this you will absolutely need the specification. You'll also need to have a good bit-reader class and knowledge of how exponential golomb encoding works for both signed and unsigned values. See here and here.
Lastly, the code found in this thread on Doom9 was invaluable to me--it's basically a full parser for an elementary H264 stream. It includes a bit reader class, routines to parse NALU, sps, pps, VUI parameters, sequence scaling matrices, etc. It's a pretty handy piece of code for any video engineer.