Potentially yes, you could save one memcpy by doing that. No idea of exactly how much you would gain by doing that for compressed data buffers, might be worth a try :) Julien Moutte, FLUENDO S.A. <div class="gmail_quote">On Tue, Dec 22, 2009 at 11:15 AM, Lionel Landwerlin <<a href="mailto:llandwerlin@gmail.com">llandwerlin@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> Well... I'm expecting mpegts data from various sources (file/http/udp/etc...) to be transfered through dma to the hardware demuxer. Does it make sense ? -- Lionel Landwerlin <div><div></div><div class="h5"> On Tue, Dec 22, 2009 at 11:04 AM, Julien Moutte <<a href="mailto:julien@moutte.net">julien@moutte.net</a>> wrote: > If your source element directly produce video frames then it makes sense to > implement such allocation functions. > > As most source elements are producing compressed data (filesrc, > demuxers,etc...), it does not really make sense to write into a downstream > allocated buffer. > > Hope this helps, > > Julien Moutte, > FLUENDO S.A. > > > On Tue, Dec 22, 2009 at 10:47 AM, Lionel Landwerlin <<a href="mailto:llandwerlin@gmail.com">llandwerlin@gmail.com</a>> > wrote: >> >> Hi gstreamer-devel, >> >> I'm interested in writing a bunch of plugins/elements to get gstreamer >> perform well enough to display SD/HD videos on a set top box chip. >> >From my firsts investigations, it seems quite possible and development >> should start quite soon. However, after reading a few article about >> gstreamer on TI OMAP chips (this one in particular >> >> <a href="http://www.eetimes.com/news/design/showArticle.jhtml?articleID=193401461&pgno=2" target="_blank">http://www.eetimes.com/news/design/showArticle.jhtml?articleID=193401461&pgno=2</a> >> ), >> I'm wondering why most of the source elements does not use the >> gst_pad_alloc_buffer function. >> >> In my case, this would be quite interesting to avoid a memory copy and >> to directly write into a contigeous dma mmapped buffer. >> >> Is it something to be done ? >> Is there a very few interest from the community ? >> >> Thanks in advance for your responses. >> >> -- >> Lionel Landwerlin >> >> >> ------------------------------------------------------------------------------ >> This SF.Net email is sponsored by the Verizon Developer Community >> Take advantage of Verizon's best-in-class app development support >> A streamlined, 14 day to market process makes app distribution fast and >> easy >> Join now and get one step closer to millions of Verizon customers >> <a href="http://p.sf.net/sfu/verizon-dev2dev" target="_blank">http://p.sf.net/sfu/verizon-dev2dev</a> >> _______________________________________________ >> gstreamer-devel mailing list >> <a href="mailto:gstreamer-devel@lists.sourceforge.net">gstreamer-devel@lists.sourceforge.net</a> >> <a href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel" target="_blank">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</a> > > > ------------------------------------------------------------------------------ > This SF.Net email is sponsored by the Verizon Developer Community > Take advantage of Verizon's best-in-class app development support > A streamlined, 14 day to market process makes app distribution fast and easy > Join now and get one step closer to millions of Verizon customers > <a href="http://p.sf.net/sfu/verizon-dev2dev" target="_blank">http://p.sf.net/sfu/verizon-dev2dev</a> > _______________________________________________ > gstreamer-devel mailing list > <a href="mailto:gstreamer-devel@lists.sourceforge.net">gstreamer-devel@lists.sourceforge.net</a> > <a href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel" target="_blank">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</a> > > ------------------------------------------------------------------------------ This SF.Net email is sponsored by the Verizon Developer Community Take advantage of Verizon's best-in-class app development support A streamlined, 14 day to market process makes app distribution fast and easy Join now and get one step closer to millions of Verizon customers <a href="http://p.sf.net/sfu/verizon-dev2dev" target="_blank">http://p.sf.net/sfu/verizon-dev2dev</a> _______________________________________________ gstreamer-devel mailing list <a href="mailto:gstreamer-devel@lists.sourceforge.net">gstreamer-devel@lists.sourceforge.net</a> <a href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel" target="_blank">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</a> </div></div></blockquote></div>