<div>Hi Vic,</div> <div> </div> <div>The procedure what has to be followed</div> <div> </div> <div>1. Extract RTP data, from the RTP header find payload type.</div> <div>2. Extract RTP data and do codec conversion if required (A law to linear or u law to linear, G.729 decoding) if required.</div> <div>3. Store the decoded data into buffer or file.</div> <div>4. Once all RTP packets you received, Find the length of RTP data. From that you form WAV header. Refer to <A href="http://www.sonicspot.com/guide/wavefiles.html">http://www.sonicspot.com/guide/wavefiles.html</A> for wav file header details.</div> <div> </div> <div>Hope this helps.</div> <div> </div> <div>With this approach my application is working fine with not much memory usage and CPU Time.</div> <div> </div> <div>If any one has better and efficient method let me know. It will be really helpful.</div> <div> </div> <div>Regards</div> <div>Ravi</div>
<div> </div> <div><BR><B><I>Vic <svictor@yahoo.co.jp></I></B> wrote:</div> <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">Hi,<BR><BR>I am using Winpcap to capture RTP packets.<BR>I want to add a wav header to it.I cannot really pre-append a header at the very beginning because I do not know the length of the wave file until I I get all RTP packets... <BR><BR>So, right now, after I dump the whole capture to the file, I write header into a separate file and then copy the dumped RTP into that file as well.<BR><BR>So, it is: WINPCAP->FILE A, HEADER-> FILE B, FILE A->FILE B.<BR><BR>This is really inefficient and eats a lot of memory. How can I pre-append a wav header to the file being dumped by winpcap?<BR><BR>Is there a function in winpcap that will allow me to define this ahead of time and just let winpcap take care of this?<BR><BR>Thanks,<BR>Vic<BR><BR><BR> <DIV style="CLEAR: both; WIDTH: 0px;
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