I think it is better to write your own videorate plugin or modify videorate plugin to support DMAI buffer than modify gstbuffer. 2010/3/16 Arnout Vandecappelle <arnout at mind.be> > Hoi all, > > I'm currently hacking with the DMAI plugins that use the DSP on the TI > OMAP > for video encoding and other transformations. These plugins require > specially allocated DMA buffers to be able to communicate with the DSP. A > custom GstTIDmaiBufferTranport sub-class of GstBuffer is used for that. > When the encoder element receives a buffer, it checks whether it is a > GstTIDmaiBufferTransport; if not, it memcpy's the data in a DMA buffer. > > Since the memcpy's completely kill performance in my application, I make > sure that GstTIDmaiBufferTransport buffers are allocated in the beginning > of > the pipeline. However, when I insert a videorate element in the pipeline, > it creates subbuffers of these. These are no longer recognized as > GstTIDmaiBufferTransport objects, and therefore the physical address of the > DMA buffer is not accessible. Hence, there are memcpy's again. > > To work around this, I've added a function to GstBuffer that checks if it > is a subbuffer and if so returns the parent buffer. Does this sound like a > good solution? If so, I'll put it in bugzilla. > > Regards, > Arnout > -- > Arnout Vandecappelle arnout at mind be > Senior Embedded Software Architect +32-16-286540 > Essensium/Mind http://www.mind.be > G.Geenslaan 9, 3001 Leuven, Belgium BE 872 984 063 RPR > Leuven > LinkedIn profile: http://www.linkedin.com/in/arnoutvandecappelle > GPG fingerprint: 31BB CF53 8660 6F88 345D 54CC A836 5879 20D7 CF43 > > > ------------------------------------------------------------------------------ > Download Intel® Parallel Studio Eval > Try the new software tools for yourself. Speed compiling, find bugs > proactively, and fine-tune applications for parallel performance. > See why Intel Parallel Studio got high marks during beta. > http://p.sf.net/sfu/intel-sw-dev > _______________________________________________ > gstreamer-devel mailing list > gstreamer-devel at lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/gstreamer-devel > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.freedesktop.org/archives/gstreamer-embedded/attachments/20100316/62081ae9/attachment.htm>
