Hello, I try to implement spatial hearing to the conference bridge using Head Related Transfer Functions (HRTF). The HRTF only needs to filter the left/right sound channel separately but with the same, additional input argument. Therefore I thought I could create a own media port, similar to the existing ports like resample. Which such a new media port, spatial hearing could be used and integrated very easily, not only for the conference bridge. The following "picture" (if it looks strange, please change the text font to "Courier New") shows my main idea. -------- --------------- | mono | | HRTF filter | | or | -> pjmedia_stereo_port -> | left channel | -> conference_bridge / wav_wirter ... | stereo | | right channel | -------- ---------------- ^ ^ | | Could be any Main part of my idea. regular media Need to be implemented. source How to start/get necessary information? To use HRTF, I need to get a stereo sound source, which can be created by using the pjmedia_stereo_port function and is working fine. The next step will be the HRTF filer (=convolver). I have a working and very fast convolver which can convolve two time-signals (one will be a frame of the source and the other one will be the hrtf-time-signal of the left or right ear). The hrtf-time-signal (to be more precise: hrir-time-signal as it is a TIME signal J ) is an existing wav-file. My problem is, that I do not know how to create a own media port or even how to access the media frames. To start over it would also be OK if I can "access" the media frames, e.g. 20ms (whatever sampling rate will be used) an process those frames "frame by frame" without any clock/timing functions. I had a look at the samples called "stereotest" and "resampleplay" and integrated the resample functionality to the stereotest. OK - this is not really difficult but I wanted to see how things work before asking questions. Maybe there are more useful and helpful examples like the both I found. And maybe I have not found THE documentation page which is answering all my questions, especially how to create own media ports or how to access media frames for own processing - please be lenient towards me as I really read a lot of pjmedia/pjsip/pjsua stuff but it is very difficult to start over with PJSIP (in addition, it is my first "big" project). Thanks for reading and helping !!! Regards Matthias -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20110321/e0543fd1/attachment.html>
