Thanks. Now I am trying to study the code I am interested in. Unfortunately, the file red_worker.c is very huge and there are not any comments that can help me.
I would like to know: 1- which parts/functions of red_worker.c are video related stuff? 2- You said: "determine if a given draw operation (has to be an opaque copy iirc) is repeated to the same area." What do you mean with "opaque copy iirc"? 3- There are a red worker thread for each QXL device instance. How many QXL device instance are there? 4- Which function does red_worker.c use to detect video streaming? Thanks for any helps you can give me 2011/4/15 Alon Levy <al...@redhat.com> > On Thu, Apr 14, 2011 at 03:20:40PM +0200, Andrea Celestino wrote: > > I would like to improve the streaming video performance in Spice, do you > > think that is possible to improve it? In what way? > > Are there documents that describes in detail how spice works with video? > > The best I can offer in terms of documentation is the pdfs in the documents > section of spice-space.org, I imagine you are looking for something more, > sorry to disappoint. > > The code you are interested in is server/red_worker.c, but that's not very > helpful since that file is huge. Would be nice to split the video related > stuff to a separate file. > > worker->streaming_video - determines how we handle streaming video > > git grep stream -- server/red_worker.c > > I can give you better pointers if you ask more specific questions, but > doing > the documentation myself right now.. too much work. > > overview of what spice does: > * determine if a given draw operation (has to be an opaque copy iirc) is > repeated to the same area. > * if so, starts a mjpeg encoder and sends the stream to the client > > how to improve this (some is on the Features page in spice-space): > * learn to do various video acceleration apis (windows has it, linux has > it) > * this is by far the best way to go regarding performance, unless you are > willing to sacrifice cpu for bandwidth in which case I guess you would > reencode. > * otoh this is a pretty large change to multiple parts of spice: > * you need to update the driver for each platform you choose to support, > update the protocol, teach server and client > * it's definitely on the todo list, but no date set. > * replace mjpeg with a different encoder > * if it's just a better performing encoder, clear win. > * otherwise you get the usual cpu/bw tradeoff. > * or you could try to learn which encoder fits which stream (based on some > metric, could be the performance of the encoders themselves) > * just throwing an idea. > > Alon > > > > > 2011/4/11 Alon Levy <al...@redhat.com> > > > > > On Mon, Apr 11, 2011 at 03:48:08PM +0200, Andrea Celestino wrote: > > > > Hi, > > > > I have installed Spice and now I'm trying to use it. I'm interested > in > > > how > > > > spice manage streaming video. I read that there is the option > > > > > > > > -streaming-video=[all|off|filter] > > > > > > > > Can you explain me the difference between these three option? > > > > Which source file read the command line? > > > > Why I have tried to play a video in a player but i have not notice > any > > > > difference between the two options 'off' and 'filter'? > > > > > > > > > > Look at > http://cgit.freedesktop.org/spice/spice/tree/server/red_worker.c > > > > > > search for STREAM_VIDEO_FILTER > > > > > > The switch toggles modes for creating streams: > > > off - never create > > > all/filter - create either based on smallest size, or just based on > > > number of consecutive opaque copies to same area. > > > > > > > Thanks very much for the help. > > > > > > > _______________________________________________ > > > > Spice-devel mailing list > > > > Spice-devel@lists.freedesktop.org > > > > http://lists.freedesktop.org/mailman/listinfo/spice-devel > > > > > > > > > _______________________________________________ > > Spice-devel mailing list > > Spice-devel@lists.freedesktop.org > > http://lists.freedesktop.org/mailman/listinfo/spice-devel > >
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