[gst-devel] udpsrc odd behaviour building a pipeline with two streams

[Tiago Katcipis]

I got some advice that maybe conecting both streams with a tee element would
resolve the problem, so i tried this:

*gst-launch -v tee name=near adder name=mixer fakesrc ! identity ! near.sink
near.src0 ! queue ! udpsink host=localhost port=5000  near.src1 ! queue !
audio/x-raw-int,rate=44100,channels=1,endianness=1234,width=16,depth=16,signed=true
! queue ! mixer. tee name=far udpsrc port=6000  ! identity ! far.sink
far.src0 ! queue ! fakesink far.src1 ! queue !
audio/x-raw-int,rate=44100,channels=1,endianness=1234,width=16,depth=16,signed=true
! queue ! mixer. mixer.src ! fakesink*

basically i added 2 tees , the tee gets the fakedata and sends it to a
fakesink and to a adder, the adder gets the received fakedata from both
streams and sends it to a fakesink too. i used queue on the src pad from the
tee and on the sinkpads of the adder. Even connecting both streams with the
tees + adder seens to not work, both streams got locked. I would expect to
not received data on the udpsrc, but the fakesrc stream blocks too.

any hint on what is wrong?

On Wed, Nov 11, 2009 at 9:15 PM, Tiago Katcipis <katcipis at inf.ufsc.br>wrote:

> I'm building a pipeline to use on a voip application, i started building a
> very simple one, one stream generates the audio and sends it with udpsink
> the other receives audio at udpsrc and play it at pulsesink. For test
> purposes i send the audio to myself. But the odd thing is that it only works
> when i use separated pipelines to build the send and the receive streams.
>
> For example, the following works fine:
>
> *gst-launch -v audiotestsrc ! identity ! audioconvert !
> audio/x-raw-int,rate=44100,channels=1,endianness=1234,width=16,depth=16,signed=true
> ! udpsink host=127.0.0.1 port=5000
> gst-launch udpsrc port=5000
> caps="audio/x-raw-int,rate=44100,channels=1,endianness=1234,width=16,depth=16,signed=true"
> ! identity ! pulsesink*
>
> But if i use only one pipeline to do the work, it starts just ok....but
> nothing happens (and no data pass through the identity0 or identity1)
>
> *gst-launch -v audiotestsrc ! identity ! audioconvert !
> audio/x-raw-int,rate=44100,channels=1,endianness=1234,width=16,depth=16,signed=true
> ! udpsink host=127.0.0.1 port=5000 udpsrc port=5000
> caps="audio/x-raw-int,rate=44100,channels=1,endianness=1234,width=16,depth=16,signed=true"
> ! identity ! pulsesink
>
> *I think it is something with udpsrc because if i try:*
> *
> *gst-launch -v audiotestsrc ! identity ! audioconvert !
> audio/x-raw-int,rate=44100,channels=1,endianness=1234,width=16,depth=16,signed=true
> ! fakesink udpsrc port=5000
> caps="audio/x-raw-int,rate=44100,channels=1,endianness=1234,width=16,depth=16,signed=true"
> ! identity ! pulsesink*
>
> it will not work too, no data reaches the fakesink.
>
> but if i try
>
> *gst-launch -v audiotestsrc ! identity ! audioconvert !
> audio/x-raw-int,rate=44100,channels=1,endianness=1234,width=16,depth=16,signed=true
> ! udpsink host=127.0.0.1 port=5000 audiotestsrc ! identity ! pulsesink*
>
> it works just fine. It sens that for some reason the udpsrc makes the
> entire pipeline stop, no data flows on either streams.
>
> I tought it could be some error on pulse with udpsrc, but:
>
> *gst-launch -v audiotestsrc ! identity !
> audio/x-raw-int,rate=44100,channels=1,endianness=1234,width=16,depth=16,signed=true
> ! fakesink udpsrc port=5000
> caps="audio/x-raw-int,rate=44100,channels=1,endianness=1234,width=16,depth=16,signed=true"
> ! identity ! fakesink*
>
> wont work either, but if i run on separated gst-launch, it works fine.
>
>
> i even have made some source code to test this, the same example that works
> on different pipelines wont work if it is made on only one pipeline.
>
> The ok code:
> https://svn.inf.ufsc.br/katcipis/c/gstreamer/pipe_voip_ok
>
> The error code:
> https://svn.inf.ufsc.br/katcipis/c/gstreamer/pipe_voip_error
>
> the odd thing is that even if udpsrc didn't receive any data, why is udpsrc
> blocking the entire pipe?
>
> hope someone can help me see what I'm doing wrong.
>
>
> best regards,
> Katcipis
>
>


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