<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html; charset=UTF-8" http-equiv="Content-Type"> </head> <body bgcolor="#ffffff" text="#000000"> On 06/13/2011 01:26 PM, Shu-Yu Fu wrote: <blockquote cite="mid:BANLkTik82yxAndwhjh2UkqeMF=jOBy_+Pw@mail.gmail.com" type="cite"> <div>Hi Tim,</div> <div><br> </div> Thanks for response so quickly.<br> <br> <div>Actually, what I am trying to do is a alternative to rtspsrc (in gst-plugins-good package).</div> <div><br> </div> <div>The difference is that it collects GstBuffers, for a 30ms or 30 GstBuffers (for example), into a GstBufferList and then push.</div> <div><br> </div> <div>No offense, but, gstreamer takes too much CPU in some circumstances as <b>GStreamer, embedded and low latency are a bad combination</b> (<i><a moz-do-not-send="true" href="http://felipec.wordpress.com/2010/10/07/gstreamer-embedded-and-low-latency-are-a-bad-combination/">http://felipec.wordpress.com/2010/10/07/gstreamer-embedded-and-low-latency-are-a-bad-combination/</a></i>) mentioned.</div> </blockquote> <br> Just as a headsup, numerous improvemnts went into gstreamer as a reaction to that post. Unfortunately felipe did not had time so far to rerun the measuremrnts and give an update.<br> <br> <blockquote cite="mid:BANLkTik82yxAndwhjh2UkqeMF=jOBy_+Pw@mail.gmail.com" type="cite"> <div><br> </div> <div>So, I try to avoid that issue and I still like gstreamer.</div> <div><br> </div> <div>I think <span class="Apple-style-span" style="border-collapse: collapse; font-family: arial,sans-serif; font-size: 13px;">adding the functionality to </span><span class="Apple-style-span" style="border-collapse: collapse; font-family: arial,sans-serif; font-size: 13px;">GstBaseSrc is a good idea and will try to do that (</span><span class="Apple-style-span" style="border-collapse: collapse; font-family: arial,sans-serif;">any thing I should pay attention to?</span><span class="Apple-style-span" style="border-collapse: collapse; font-family: arial,sans-serif; font-size: 13px;">).</span></div> </blockquote> <br> If aggregating data in rtspsrc and using a bufferlist improved the situation, I think the best place to add the changes would be basesrc and rtspsrc. Writing another rtspsrc sound like a not so good idea to me.<br> <br> Stefan<br> <br> <blockquote cite="mid:BANLkTik82yxAndwhjh2UkqeMF=jOBy_+Pw@mail.gmail.com" type="cite"> <div><font class="Apple-style-span" face="arial, sans-serif"><span class="Apple-style-span" style="border-collapse: collapse;"><br> </span></font></div> <div>Thanks.</div> <div><br> </div> <div> <div class="gmail_quote">2011/6/13 Tim-Philipp Müller <span dir="ltr"><<a moz-do-not-send="true" href="mailto:t.i.m@zen.co.uk">t.i.m@zen.co.uk</a>></span><br> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">On Mon, 2011-06-13 at 17:12 +0800, Shu-Yu Fu wrote:<br> <br> Hi,<br> <div class="im"><br> > Currently, I need to implement a source element which pushes a<br> > GstBufferList.<br> <br> </div> Out of curiosity, what kind of element is this?<br> <div class="im"><br> > But, a sub-class (GstPushSrc) of GstBaseSrc is expected to generate a<br> > GstBuffer in the create function. Returning a GstBufferList is<br> > not valided at all.<br> ><br> > I am also grep the source code packages (gstreamer-0.10.34,<br> > gst-plugins-base-0.10.34 and gst-plugins-good-0.10.29), but didn't<br> > find any thing helpful.<br> ><br> > But,the document says I can push a GstBufferList to the peer pad<br> > (<a moz-do-not-send="true" href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#gst-pad-push-list" target="_blank">http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#gst-pad-push-list</a>) or chain a GstBufferList to a pad (<a moz-do-not-send="true" href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#gst-pad-chain-list" target="_blank">http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#gst-pad-chain-list</a>).<br> ><br> > So, I was wondering does that means I have to write my own source<br> > element (like GstBaseSrc did)?<br> > Or, there is an easy way to do that?<br> > Or, there are some examples I missed?<br> <br> </div> You're right, the GstBaseSrc/GstPushSrc API currently doesn't cater for<br> buffer lists, which is mostly for historical reasons, and because no one<br> really needed that functionality yet (as far as I know, anyway).<br> <br> I think it'd be best if you tried to add that functionality to<br> GstBaseSrc. Don't try to write your own source that doesn't use<br> GstBaseSrc.<br> <br> Alternatively, you could do something like gst_pad_push_list() from your<br> create() function and then return a buffer of 0 size or so to the base<br> class. That's a bit hackish though.<br> <br> Cheers<br> -Tim<br> <br> <br> _______________________________________________<br> gstreamer-devel mailing list<br> <a moz-do-not-send="true" href="mailto:gstreamer-devel@lists.freedesktop.org">gstreamer-devel@lists.freedesktop.org</a><br> <a moz-do-not-send="true" href="http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel" target="_blank">http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a><br> </blockquote> </div> <br> <br clear="all"> <br> -- <br> Sincerely,<br> Bobby<br> </div> <pre wrap=""> <fieldset class="mimeAttachmentHeader"></fieldset> _______________________________________________ gstreamer-devel mailing list <a class="moz-txt-link-abbreviated" href="mailto:gstreamer-devel@lists.freedesktop.org">gstreamer-devel@lists.freedesktop.org</a> <a class="moz-txt-link-freetext" href="http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel">http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a> </pre> </blockquote> <br> </body> </html>