Hi Manmeet, 1. In this link http://www.pjsip.org/pjmedia/docs/html/group__PJMEDIA__MASTER__PORT.htm, they say there are 2 ports connecting to Master Port, what are they ? 2. In file conference.c, "pjmedia_conf" structure, there is field "pjmedia_port *master_port" And in master_port.c, there is structure "pjmedia_master_port". Are they related ? On Tue, Jan 29, 2013 at 1:56 PM, Manmeet Singh <manmeets at gc-solutions.net>wrote: > 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 > > 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> 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 >>> in Media 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 >>> PJMEDIA Portable 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). >>> See Sound 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 uses Clock Generator<http://www.pjsip.org/docs/latest-2/pjmedia/docs/html/group__PJMEDIA__CLOCK.htm> >>> as the clock source. By using Master 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 see Master 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> 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] *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, 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" >>>> >>>> >>>> >>>> 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 >>>> 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 listpjsip at lists.pjsip.orghttp://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 > > > -- Khoa Pham HCMC University of Science Faculty of Information Technology -------------- next part -------------- An HTML attachment was scrubbed... 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