Hi Manmeet, sorry for asking so many questions :) 1. PJMEDIA_CONF_NO_DEVICE means we don;t need sound device to play audio ? 2. In this link http://www.pjsip.org/pjmedia/docs/html/group__PJMEDIA__CONF.htm, they said "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." Why should we get master port, then connect to master port ? What is the difference between pjmedia_conf->master_port (in conference.c) and pjmedia_master_port (in master_port.c) ? On Tue, Jan 29, 2013 at 2:56 PM, Manmeet Singh <manmeets at gc-solutions.net>wrote: > Hello Khoa, > > Please find my answers inline below. > > Regards > Manmeet > > > On 01/29/2013 12:32 PM, Khoa Pham wrote: > > 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 ? > > As mentioned in the document, the two ports are for media streams. Imagine > the 2 ports as pipes with their other ends connected to clients/files/voice > processors and the master port as pump connecting the two streams/port > together, it pulls data from one stream and pushes it onto the other. > > > 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 ? > > Yes, when you create a conference with PJMEDIA_CONF_NO_DEVICE option, an > internal master port is created and attached to the conference, now to > start and stop the mix, you need to start and stop the master port. Below > code snippet is taken from pjsip-apps/src/samples/confbench.c > > status = pjmedia_conf_create( pool, > PORT_COUNT, > CLOCK_RATE, > 1, SAMPLES_PER_FRAME, 16, > *PJMEDIA_CONF_NO_DEVICE*, > &conf); > if (status != PJ_SUCCESS) { > app_perror(THIS_FILE, "Unable to create conference bridge", status); > return 1; > } > > conf_port = pjmedia_conf_get_master_port(conf); > > /* Create master port */ > status = pjmedia_master_port_create(pool, null_port, conf_port, 0, > &master_port); > > pjmedia_master_port_start(master_port); > ........ > ........ > pjmedia_master_port_stop(master_port); > > > > > 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 > > > -- Khoa Pham HCMC University of Science Faculty of Information Technology -------------- next part -------------- An HTML attachment was scrubbed... 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