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<div class="moz-cite-prefix">On 05/08/2014 11:30 PM, Yogesh Tyagi
wrote:<br>
</div>
<blockquote
cite="mid:CADL-HDjDpvBr7WpT0Pi+seGAQsyMMYNnZRmw7k2QLNVye3TaqA@mail.gmail.com"
type="cite">
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charset=ISO-8859-1">
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<div style="font-family:arial,sans-serif;font-size:13px"> If I
add a probe to src pad of my element and emit a signal from
this probe handler which will be received by the
application.Upon receiving this signal, application is
supposed to do state change of this element.</div>
<div style="font-family:arial,sans-serif;font-size:13px">Will it
be a valid implementation? Does g_signal_emit or signal
handler(in application) run in pipeline context?</div>
</div>
</blockquote>
Can you describe what you are trying to do from high level? It would
help coming up with a proper solution. Why do you need to change
state when first buffer is received?<br>
<br>
And to answer your question, the signal emission happens from the
thread that does it, so it would be done from a thread from the
pipeline and it usually isn't safe to perform state changes from it.<br>
<br>
<blockquote
cite="mid:CADL-HDjDpvBr7WpT0Pi+seGAQsyMMYNnZRmw7k2QLNVye3TaqA@mail.gmail.com"
type="cite">
<div dir="ltr">
<div style="font-family:arial,sans-serif;font-size:13px">
<br>
</div>
<div style="font-family:arial,sans-serif;font-size:13px">Thanks,</div>
<div style="font-family:arial,sans-serif;font-size:13px">Yogesh</div>
</div>
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">On Fri, May 9, 2014 at 5:42 AM, Luis de
Bethencourt <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:luis@debethencourt.com" target="_blank">luis@debethencourt.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">Hi Yogesh,<br>
<br>
You could use a gst_pad_add_probe () to be notified of the
change you are looking for in the element's video source
pad. <br>
<br>
<a moz-do-not-send="true"
href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GstPadProbeType"
target="_blank">http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GstPadProbeType</a>
<div>
<br>
</div>
<div>Hope this helps,</div>
<div>Luis<br>
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">
<div>
<div class="h5">On 8 May 2014 14:18, Yogesh Tyagi
<span dir="ltr"><<a moz-do-not-send="true"
href="mailto:yogesh.bit2006@gmail.com"
target="_blank">yogesh.bit2006@gmail.com</a>></span>
wrote:<br>
</div>
</div>
<blockquote class="gmail_quote" style="margin:0px
0px 0px
0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<div>
<div class="h5">
<div dir="ltr">I want to notify the
application when first buffer is received on
video source pad of my demux element.
<div>
<br>
</div>
<div><br>
</div>
<div>Thanks,</div>
<div>Yogesh</div>
</div>
<div>
<div>
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">On Thu, May 8,
2014 at 6:36 PM, Yogesh Tyagi <span
dir="ltr"><<a
moz-do-not-send="true"
href="mailto:yogesh.bit2006@gmail.com"
target="_blank">yogesh.bit2006@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px
0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<div dir="ltr">Hi,
<div><br>
</div>
<div>What is best mechanism for
application and element
interaction in gstreamer?</div>
<div><br>
</div>
<div>Thanks,</div>
<div>Yogesh</div>
</div>
</blockquote>
</div>
<br>
</div>
</div>
</div>
<br>
</div>
</div>
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<br>
<pre class="moz-signature" cols="72">--
Thiago Sousa Santos
Senior Multimedia Engineer, Open Source Group
Samsung Research America - Silicon Valley</pre>
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