---------- Forwarded message ---------- From: Amir Pakdel <pakdel@xxxxxxxxx> Date: Fri, Aug 5, 2011 at 1:20 PM Subject: Re: Contribution To: Perry Ismangil <perry at teluu.com>, pjsip at lists.pjsip.org Hi Perry, I am testing pjproject-trunk (from SVN) on a Linux x64 (Slackware64 13.37.0) and when I ran the vid_streamutil for the first time, I encountered lots and lots of the following message: libv4l2: error dequeuing buf: Resource temporarily unavailable According to the documentation of V4L2 ( http://v4l2spec.bytesex.org/spec/r12878.htm), it is because 'Non-blocking I/O has been selected using O_NONBLOCK and no buffer was in the outgoing queue.' Therefore, in v4l2_dev.c, I removed ' | O_NONBLOCK' from v4l2_open call. I hope the stream uses a separate thread and this would not affect its performance. Another change was calling pjmedia_vid_dev_default_param (in vid_streamutil.c) with PJMEDIA_VID_DEFAULT_RENDER_DEV (instead of 1) when 'dir' is PJMEDIA_DIR_DECODING, so that 'pjmedia_vid_port_create(pool, &vpp, &renderer);' would not return PJMEDIA_EVID_INVDEV. Moreover, the pjmedia_vid_codec_h263_fmtp of H263 pjmedia_vid_codec_param is empty; therefore, pjmedia_vid_codec_h263_apply_fmtp will reset the size to QCIF: /* Negotiate size & MPI setting */ if (fmtp_rem.mpi_cnt == 0) { /* Remote doesn't specify MPI setting, send QCIF=1 */ size.w = 176; size.h = 144; mpi = 1; printf("Remote doesn't specify MPI setting, send QCIF=1\n"); } else if (fmtp_loc.mpi_cnt == 0) { Consequently, the previously created capture port will generate fames with a different size wich will result in a scrambled video frames! Therefore, I moved create_stream(...) which creates the codec to a few lines before creation of the capture port. The patch is attached. I hope it would be worth something :) Regards, Amir On Mon, Jul 25, 2011 at 3:03 PM, Amir Pakdel <pakdel at gmail.com> wrote: > Hi Perry, > > Thanks for your prompt reply. > > I have not developed anything special yet. I was wondering if the > development team needs help with anything particular or maybe there is a bug > that I can try to fix? > I am mostly interested in video streaming and perhaps I can help with > something like development of a Simple GUI for video API testing ( > http://trac.pjsip.org/repos/ticket/1327). > > > Regards, > Amir > > > > On Mon, Jul 25, 2011 at 2:51 PM, Perry Ismangil <perry at teluu.com> wrote: > >> Hi Amir, >> >> We're glad you're excited with PJSIP. >> >> You can describe your contribution here on the list, and we can >> consider it for inclusion. >> >> If it's substantial, then as mentioned you need to send the >> Contributor agreement to me. >> >> Thanks. >> >> Regards, >> >> On Mon, Jul 25, 2011 at 06:57, Amir Pakdel <pakdel at gmail.com> wrote: >> > Dear Developers, >> > >> > >> > I am really enthusiast about PJSIP version 2.0 and I want to help with >> > development. >> > I have read almost all of the documentation in >> http://www.pjsip.org/docs.htm >> > and I have written a few sample applications using pjproject-1.10. >> > I would like to know how could I contribute to the development of the >> > project? Where should I start (apart from PJSIP Contributor Agreement)? >> > >> > >> > Best Regards, >> > Amir Pakdel >> > >> > >> > _______________________________________________ >> > Visit our blog: http://blog.pjsip.org >> > >> > pjsip mailing list >> > pjsip at lists.pjsip.org >> > http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org >> > >> > >> >> >> >> -- >> Perry Ismangil >> > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20111001/7486526f/attachment.html> -------------- next part -------------- A non-text attachment was scrubbed... Name: pjproject.patch Type: application/octet-stream Size: 2753 bytes Desc: not available URL: <http://lists.pjsip.org/pipermail/pjsip_lists.pjsip.org/attachments/20111001/7486526f/attachment.patch>
