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

[Tiago Katcipis]

i started to think that maybe it is a bug at udpsink/src when both are used
on the same pipe.

The following test works fine, udpsrc receives data and sends it to the
fakesink...that prints it on the screen:
*gst-launch -v audiotestsrc ! audioconvert ! audiorate !
"audio/x-raw-int,rate=8000,channels=1,endianness=1234,width=16,depth=16,signed=true"
! udpsink host=127.0.0.1 port=5000
gst-launch -v udpsrc port=5000
caps="audio/x-raw-int,rate=8000,channels=1,endianness=1234,width=16,depth=16,signed=true"
! fakesink*

If i run both streams on the same pipeline, it simply wont work:
*gst-launch -v audiotestsrc ! audioconvert ! audiorate !
"audio/x-raw-int,rate=8000,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=8000,channels=1,endianness=1234,width=16,depth=16,signed=true"
! fakesink*

no data reaches the fakesink, and it is basically the same thing, the only
diference is that they are on the same pipeline.

Is WRONG to use udpsink and udpsrc together on the same pipe to build two
diferent streams? If it is not wrong im going to report this as a bug at
udpsink/udpsrc. I already builded examples that use pulsesrc and pulsesink
on two diferent streams on the same pipeline and worked perfectly fine,
thats why im suspicious at udp.

hope someone can give me some help on this.

best regards,
Katcipis

On Mon, Nov 16, 2009 at 1:48 PM, Tiago Katcipis <katcipis at inf.ufsc.br>wrote:

> 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
>>
>>
>
>
> --
> "Se você se perder na selva africana, não precisa se desesperar. Basta
> sentar em uma pedra e começar a instalar GNU/Linux em seu laptop. Em menos
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>



-- 
"Se você se perder na selva africana, não precisa se desesperar. Basta
sentar em uma pedra e começar a instalar GNU/Linux em seu laptop. Em menos
de 5 minutos aparecerá alguém pra discordar de sua escolha de distribuição,
do particionamento, do gerenciador de janelas, do ambiente de desktop, do
editor de textos..."
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