How to modify the 3gp streaming filter to read Only rtp data?

How to modify the 3gp streaming filter to read Only rtp data?
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( 3gp streaming stack it will receives the rtsp and rtp data)

Solution:Quick and dirty way to do this:
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Use Some SDP file to create the dummy audio and video output pin. ( We can create it with rtsp:// URL itself);
Hard code the media type, File duration (instead of the file duration configure duration as much as we need to receive data for RTP),config data in a filter .

How to get SDP file for any RTSP file?

How to get SDP file for any RTSP file?
RTSP response will have the SDP description
if we are having rtsp URL, we can open it with Quick time Player and at the same time, we can open the Ethereal to capture the net logs.
RTSP response RTSP/1.1 200 OK will have a SDP description.
Even with this SDP description and save it into SDP file and open it in Quick time, we are able to play it in Quick time

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.

RTP Source Filter or SDP Source Filter ?

Develop the Stories :
-----------------------
Way1 :
-------
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.

How to parse MPEG4 data over the RTP stream and identify the header with SDP file ?

analysing the RTP received packets from middle of the sending and test the SDP with QuickTime and VLC player.
Qt and VLC plays the RTP stream thru SDP file .So There might be two chance for it.

1.without SDP file players can't receive RTP stream data.
Reason :
If I opened the RTP stream in a VLC player, it doesnt receive RTP stream data and gives unable to open error.

2. So based on this SDP file and we have to search for the VOL_start_code. For Each frame VOP is available. Successive VOPs can have I Frame or P Frame. for computer video, VOL_Header must have an information about Width and height

So combine the VOP information and SDP file information, it creates the header for MPEG4 Encoded data. But VOP start Code is not like that... 0000 01 B6 (vop_start_code ) it is available in more than one RTP packet consecutively.These packets are having less frame size.

VOL header is having more video Info . So it is having the header info. So we have to search for the Next VOL header.
if we started from middle of the RTP stream.

SDP protocol, SDP file Format

SDP protocol :
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.SDP file can be played in VLC player and Quicktime player.

So without any headers, How is it possible to decode the data ?
From Sample SDP file, what info we are getting ?.
1.MP4v -ES
2.IPaddress and Port to receive data
3.payload type ( 96)
4.profile-level-id ( argument passed to the MPEG4V-ES stream.)