gst_element_set_state hangs

[Jianchun Zhou]

hi, guys:

A problem has been troubling me a lot for quite a period of time.

when I use gstreamer to play an online radio stream, it blocks on gst_element_set_state(play, GST_STATE_PLAYING);
the application hangs and has no response. my system is Ubuntu 10.10 LTS.

the attached is my source code, the url mms://live.cbg.cn/yinyue is the one blocks, and the other one can play.

anybody can shed some light for me, how can I return from the setting state operation immediately?

thanks in advance.


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[Julien Moutte]

Depending on the element in the pipeline which will handle the URI you are trying to play, the state change call can be blocking on network access.

For example libneon HTTP source will change state in a synchronous way and block the _set_state function whereas libsoup will do this asynchronously.

I guess the same happens to you here, the mms src element is probably doing stuff synchronously in the state change function and blocks your application's main thread.

You can either call the set_state function in a deferred thread or try to improve the element so that the state change is not blocking so much.

Hope this helps,

Best regards,

Julien Moutte
CTO 
Fluendo
San Francisco, USA & Barcelona, SPAIN
Tel BCN. [phone]
Tel USA. [phone]

www.fluendo.com & www.moovida.com

P Please consider the environment before printing this e-mail.

On Wed, Apr 13, 2011 at 11:41 AM, Jianchun Zhou <[hidden email]> wrote:

hi, guys:

A problem has been troubling me a lot for quite a period of time.

when I use gstreamer to play an online radio stream, it blocks on gst_element_set_state(play, GST_STATE_PLAYING);
the application hangs and has no response. my system is Ubuntu 10.10 LTS.

the attached is my source code, the url mms://live.cbg.cn/yinyue is the one blocks, and the other one can play.

anybody can shed some light for me, how can I return from the setting state operation immediately?

thanks in advance.


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[Johan Thelin]

libmms tries to contact the server blocking, and it waits for a header
(still blocking). I posted a patch that fixes the
hack-on-initial-contact-issue last week, but I have not had the time
to take out all the blocking parts of the mms src element.

Johan Thelin

On 13 April 2011 12:40, Julien Moutte <[hidden email]> wrote:

> Depending on the element in the pipeline which will handle the URI you are
> trying to play, the state change call can be blocking on network access.
> For example libneon HTTP source will change state in a synchronous way and
> block the _set_state function whereas libsoup will do this asynchronously.
> I guess the same happens to you here, the mms src element is probably doing
> stuff synchronously in the state change function and blocks your
> application's main thread.
> You can either call the set_state function in a deferred thread or try to
> improve the element so that the state change is not blocking so much.
> Hope this helps,
> Best regards,
>
> Julien Moutte
> CTO
> Fluendo
> San Francisco, USA & Barcelona, SPAIN
> Tel BCN. [phone]
> Tel USA. [phone]
>
> www.fluendo.com & www.moovida.com
>
> P Please consider the environment before printing this e-mail.
>
>
> On Wed, Apr 13, 2011 at 11:41 AM, Jianchun Zhou <[hidden email]>
> wrote:
>>
>> hi, guys:
>>
>> A problem has been troubling me a lot for quite a period of time.
>>
>> when I use gstreamer to play an online radio stream, it blocks on
>> gst_element_set_state(play, GST_STATE_PLAYING);
>> the application hangs and has no response. my system is Ubuntu 10.10 LTS.
>>
>> the attached is my source code, the url mms://live.cbg.cn/yinyue is the
>> one blocks, and the other one can play.
>>
>> anybody can shed some light for me, how can I return from the setting
>> state operation immediately?
>>
>> thanks in advance.
>>
>>
>> --
>> Best Regards
>>
>> _______________________________________________
>> gstreamer-devel mailing list
>> [hidden email]
>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>>
>
>
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
>
>

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Johan Thelin M.Sc.E.E.
Senior Software Developer

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Ekelundsgatan 4, 6tr, SE-411 18 Gothenburg, Sweden
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Skype: jothpelagicore
E-Mail: [hidden email]
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