RTP Source Filter or SDP Source Filter ?

Develop the Stories :
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Way1 :
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1.Implement the IFileSourceFilter in RTP source filter
2.In IFileSourceFilter's Load() fn,Do the following:

i)if the VOS header is available, then Set this VOS header to MPEG2VIDEOINFO's dwSequenceHeader and Set the Media type MPEG2VIDEOINFO 's width and height and further informations

ii) Wait For voS or VOL header. if the VOS header is not available, then check for the VOL header. if the VOL header is available then Frame the VOS header based on VOL information and Hardcode the profile and level indication and construct the VOS header

3.Later convert it to Socket and Instead of RTP MPEG4 Source Filters, we may call it as SDP Source Filter. RTP Source Filter ? or SDP Source Filter ? There will be no RTP Source filter only SDP Source Filter? Combine more than one stream.