Hello Khoa, Sorry I answered in just my context only. Basically I was answering your question keeping in mind that you may be looking at developing a server, so in case of server you may be running numerous conferences and you cannot keep sound port as zero port for all the conferences. You do need sound port to play sound on machine incase you are running a client and conferencing with multiple parties with their calls landing on your system. pjmedia_conf->master_port (in conference.c) is used internal to conference, where as pjmedia_master_port (in master_port.c) is used for controlling the start and stop of conference mixing by using pjmedia_master_port_start and pjmedia_master_port_stop respectively and other similar functions. Regards Manmeet On 01/29/2013 04:37 PM, Khoa Pham wrote: > 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 <mailto: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 <mailto: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 >>> <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 >> >> >> >> >> -- >> 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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