Note, I didn't modify gstbuffer, I just added a function that peeks through the GstSubBuffer class. Regards, Arnout On Tuesday 16 March 2010 01:15:18, Demon Deng wrote: > 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 -- 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
