Hello Khoa, Port zero is port in the conference. It could be Master Port or Sound Port depending on what option you provided when calling pjmedia_conf_create. Regards Manmeet On 01/29/2013 12:19 PM, Khoa Pham wrote: > Hi Manmeet, > > So Sound Device Port uses sound hardware clock, and Master Port uses > Clock Generator ? > And in 1 conference bridge, there should be only 1 of these 2 Ports ? > > In this link > http://www.pjsip.org/pjmedia/docs/html/group__PJMEDIA__CONF.htm, they said > "Under normal operation (i.e. when PJMEDIA_CONF_NO_DEVICE option is > NOT specified), the bridge internally create an instance of sound > device and connect the sound device to port zero of the bridge. > > If PJMEDIA_CONF_NO_DEVICE options is specified, no sound device will > be created in the conference bridge. > Application MUST acquire the port interface of the bridge by calling > pjmedia_conf_get_master_port(), and connect this port interface to a > sound device port by calling pjmedia_snd_port_connect(), or to a > master port (pjmedia_master_port) if application doesn't want to > instantiate any sound devices." > > What is port zero? If port zero is Master Port, then Sound device is > connected to Master Port ?? > > > > On Tue, Jan 29, 2013 at 12:33 PM, Manmeet Singh > <manmeets at gc-solutions.net <mailto:manmeets at gc-solutions.net>> wrote: > > Guys, > Please correct me here if I am wrong in any point. I have been > studying PJSip for sometime now but I may have many incorrect > assumptions when trying to connect the dots. :) > > Hello Khoa, > In conferencing, the way it works port zero would either be Sound > Device Port or Master Port. These are attached for a reason, both > these ports have a unique property, they provide clock/timing to > the media they connect to. Other media ports by design are > passive, they would not push the conference to take their buffers > and mix them for other parties to listen. Sound card interfaces > require callbacks which either provide recorded voice in buffer or > while playing a buffer when finished would ask for next buffer. > > Sound card has callbacks and on similar pattern media port > internally has an instance of Clock Generator, so for the > conference mixing to happen you need to have one of these added to > the conference. > > If you have any further queries or if any of my points above are > not clear, please do let me know. > > Regards > Manmeet > > > On 01/28/2013 10:24 PM, Khoa Pham wrote: >> Hi Manmeet, >> >> I've read those 3 links. please explain to me what is the >> relation among sound device port, master port, and port zero. >> >> >> On Mon, Jan 28, 2013 at 8:37 PM, Manmeet Singh >> <manmeets at gc-solutions.net <mailto:manmeets at gc-solutions.net>> wrote: >> >> Hello Khoa, >> >> If following links don't clarify things then please do let me >> know. Then I'll try and give you a snapshot of the complete >> scenario of how the conference is designed in pjsip. >> >> snd_port >> http://www.pjsip.org/pjmedia/docs/html/group__PJMED__SND__PORT.htm >> master_port >> http://www.pjsip.org/pjmedia/docs/html/group__PJMEDIA__MASTER__PORT.htm >> port >> http://www.pjsip.org/docs/latest-2/pjmedia/docs/html/group__PJMEDIA__PORT.htm >> >> The media clock/timing extends the media port concept that is >> explained inMedia Ports Framework >> <http://www.pjsip.org/docs/latest-2/pjmedia/docs/html/group__PJMEDIA__PORT.htm>. >> When clock is present in the ports interconnection, media >> will flow automatically (and with correct timing too!) from >> one media port to another. >> >> There are few objects in PJMEDIA that are able to provide >> clock/timing to media ports interconnection: >> >> * Sound Device Port >> <http://www.pjsip.org/docs/latest-2/pjmedia/docs/html/group__PJMED__SND__PORT.htm> >> The sound device makes a good candidate as the clock >> source, and PJMEDIAPortable Sound Hardware Abstraction >> <http://www.pjsip.org/docs/latest-2/pjmedia/docs/html/group__PJMED__SND.htm>is >> designed so that it is able to invoke operations >> according to timing driven by the sound hardware clock >> (this may sound complicated, but actually it just means >> that the sound device abstraction provides callbacks to >> be called when it has/wants media frames). >> SeeSound Device Port >> <http://www.pjsip.org/docs/latest-2/pjmedia/docs/html/group__PJMED__SND__PORT.htm>for >> more details. >> >> * Master Port >> <http://www.pjsip.org/docs/latest-2/pjmedia/docs/html/group__PJMEDIA__MASTER__PORT.htm> >> The master port usesClock Generator >> <http://www.pjsip.org/docs/latest-2/pjmedia/docs/html/group__PJMEDIA__CLOCK.htm>as >> the clock source. By usingMaster Port >> <http://www.pjsip.org/docs/latest-2/pjmedia/docs/html/group__PJMEDIA__MASTER__PORT.htm>, >> it is possible to interconnect passive media ports and >> let the frames flow automatically in timely manner. >> Please seeMaster Port >> <http://www.pjsip.org/docs/latest-2/pjmedia/docs/html/group__PJMEDIA__MASTER__PORT.htm>for >> more details. >> >> >> Regards >> Manmeet >> >> >> On 01/28/2013 06:53 PM, Khoa Pham wrote: >>> Thanks Gaurav for the prompt reply, I've already read that >>> link. >>> "A master port has two media ports connected to it". What >>> are those 2 media ports? >>> In "pjmedia_conf" structure, there are "master_port", >>> "snd_port" and "ports" list, how are they related ? >>> >>> >>> On Mon, Jan 28, 2013 at 8:15 PM, Gaurav Srivastava >>> <gaurav.srivastava2 at agnity.com >>> <mailto:gaurav.srivastava2 at agnity.com>> wrote: >>> >>> Hi Khoa, >>> >>> Please go through the link >>> >>> http://www.pjsip.org/pjmedia/docs/html/group__PJMEDIA__MASTER__PORT.htm >>> >>> In case not fruitful, please let me know. >>> >>> Thanks and Regards, >>> >>> Gaurav >>> >>> -----Original Message----- >>> *From:* pjsip [mailto:pjsip-bounces at lists.pjsip.org >>> <mailto:pjsip-bounces at lists.pjsip.org>] *On Behalf Of >>> *Khoa Pham >>> *Sent:* Monday, January 28, 2013 6:33 PM >>> *To:* pjsip list >>> *Subject:* [pjsip] What is master port and port zero ? >>> >>> When reading conference bridge on pjsip.org/pjmedia/docs >>> <http://pjsip.org/pjmedia/docs>, I see these 2 port. >>> What are they, are they the same ? >>> >>> When running pjsua_app, I use "cl" command to list port >>> in conference bridge, I see >>> >>> pjsua_var.mconf->master_port->info->name = "Wave mapper" >>> >>> pjsua_var.mconf->ports[0]->name = "Wave mapper" >>> >>> pjsua_var.mconf->ports[1]->name = "ringback" >>> >>> pjsua_var.mconf->ports[2]->name = "ring" >>> >>> pjsua_var.mconf->ports[3]->name = >>> "sip:voip1 at freesipserver.com >>> <mailto:sip%3Avoip1 at freesipserver.com>" >>> >>> And it says ports[0] is transmitting to port[3], and >>> port[3] is transmitting to ports[0] >>> >>> Any answer is highly appreciated, thanks in advance. >>> >>> -- >>> Khoa Pham >>> HCMC University of Science >>> Faculty of Information Technology >>> >>> >>> _______________________________________________ >>> Visit our blog: http://blog.pjsip.org >>> >>> pjsip mailing list >>> pjsip at lists.pjsip.org <mailto:pjsip at lists.pjsip.org> >>> http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org >>> >>> >>> >>> >>> -- >>> Khoa Pham >>> HCMC University of Science >>> Faculty of Information Technology >>> >>> >>> _______________________________________________ >>> Visit our blog:http://blog.pjsip.org >>> >>> pjsip mailing list >>> pjsip at lists.pjsip.org <mailto:pjsip at lists.pjsip.org> >>> http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org >> >> >> >> >> -- >> Khoa Pham >> HCMC University of Science >> Faculty of Information Technology > > > > > -- > Khoa Pham > HCMC University of Science > Faculty of Information Technology -------------- next part -------------- An HTML attachment was scrubbed... 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