Re: [Qemu-devel] Re: [RFC] qemu-gui based on wxWidgets and libvncclient
Here's a partial translation/explanation of the link that Johannes sent some days ago, concerning remote sound in VNC. The final documentation (in german) can be found at http://www.ks.uni-freiburg.de/download/studienarbeit/SS05/08-05-TonSpur-DRichter/Dokumentation/Dokumentation.pdf According to that PDF, sound is transmitted by capturing it with a Java application, then converting it using JMF (Java Media Framework) and sending it out as RTP stream. A Java client receives the RTP stream and plays it. As far as I understand, handshaking is done with an own TCP connection, while actual RTP packets are sent via UDP. During handshaking, connection speed is measured (see 6.1.2) to decide on the encoding (see 6.2.2). There's also an older document at http://www.ks.uni-freiburg.de/download/studienarbeit/WS03/Ton-Spur-VNC.pdf which indeed describes a way to use ESD for remote sound. Regards, Oliver Anthony Liguori wrote: Johannes Schindelin wrote: Hi, On Tue, 17 Oct 2006, Fabrice Bellard wrote: Another point is that you should consider adding audio support. I can help you on that (maybe malc would be interested too !). A simple format could be 4 bit ADPCM at fixed frequency. Optionally A more advanced codec such as Vorbis could be used. Please, please not _another_ vnc hack! The RFB protocol loses all of its appeal if everybody has proprietary, incompatible extensions! If you bother to search Google for prior art, here is a link: http://www.ks.uni-freiburg.de/php_arbeitdet.php?id=75 Yes, it is in German, but it already works. No need to add yet another obscure extension. My German is not very good, but from what I was able to read, it seems like they are just using VNC to transmit the port information for doing esd forwarding. Presumably this saved a lot of work because no server side code was needed. Regards, Anthony Liguori Ciao, Dscho ___ Qemu-devel mailing list Qemu-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/qemu-devel ___ Qemu-devel mailing list Qemu-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/qemu-devel
[Qemu-devel] Re: [RFC] qemu-gui based on wxWidgets and libvncclient
Johannes Schindelin wrote: Hi, On Tue, 17 Oct 2006, Fabrice Bellard wrote: Another point is that you should consider adding audio support. I can help you on that (maybe malc would be interested too !). A simple format could be 4 bit ADPCM at fixed frequency. Optionally A more advanced codec such as Vorbis could be used. Please, please not _another_ vnc hack! The RFB protocol loses all of its appeal if everybody has proprietary, incompatible extensions! If you bother to search Google for prior art, here is a link: http://www.ks.uni-freiburg.de/php_arbeitdet.php?id=75 Yes, it is in German, but it already works. No need to add yet another obscure extension. My German is not very good, but from what I was able to read, it seems like they are just using VNC to transmit the port information for doing esd forwarding. Presumably this saved a lot of work because no server side code was needed. Regards, Anthony Liguori Ciao, Dscho ___ Qemu-devel mailing list Qemu-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/qemu-devel
[Qemu-devel] Re: [RFC] qemu-gui based on wxWidgets and libvncclient
Fabrice Bellard wrote: Anthony Liguori wrote: I have no experience with libvncclient. I think the general idea of using VNC to create an external QEMU GUI is a good one. Previously, I had posted some patches for a shmem GUI that used a custom control channel. After hacking on that for a little bit based on some feedback, I've come full circle and am now under the view that extending VNC is a better long term approach. So, I've reserved some pseudo-encodings and a client message type and am now working on some VNC extensions to enable better QEMU integration. My current client code is available at: http://hg.codemonkey.ws/vnc-gui/ The VNC extensions are still a work in progress but documentation is here: http://tocm.wikidot.com/vncextensions I think this is a good idea. First one detail: for Pointertypechange, it would be better to use the value 32768 as 0 instead of 32767 or to use a 16 bit two complement value. Changing the U16's to S16's is a really good idea. I'll make the change. Another point is that you should consider adding audio support. I can help you on that (maybe malc would be interested too !). A simple format could be 4 bit ADPCM at fixed frequency. Optionally A more advanced codec such as Vorbis could be used. I know very little about audio so help would be appreciated. I currently have 16 pseudo-encodings and a client/server message reserved so we have ample room to extend VNC. Regards, Anthony Liguori Regards, Fabrice. ___ Qemu-devel mailing list Qemu-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/qemu-devel
Re: [Qemu-devel] Re: [RFC] qemu-gui based on wxWidgets and libvncclient
On 10/18/06, Johannes Schindelin [EMAIL PROTECTED] wrote: Hi, On Tue, 17 Oct 2006, Fabrice Bellard wrote: Another point is that you should consider adding audio support. I can help you on that (maybe malc would be interested too !). A simple format could be 4 bit ADPCM at fixed frequency. Optionally A more advanced codec such as Vorbis could be used. Please, please not _another_ vnc hack! The RFB protocol loses all of its appeal if everybody has proprietary, incompatible extensions! If you bother to search Google for prior art, here is a link: http://www.ks.uni-freiburg.de/php_arbeitdet.php?id=75 Yes, it is in German, but it already works. No need to add yet another obscure extension. Hello all, Does qemu actually needs a vnc hacked backend to support a gui version of it? I think a better/cleaner solution is what it is proposed here: http://lists.gnu.org/archive/html/qemu-devel/2005-02/msg00075.html as it will let developers build their own frontend, of course qemu could have its own official gui in the main source tree. Ciao, Dscho ___ Qemu-devel mailing list Qemu-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/qemu-devel ___ Qemu-devel mailing list Qemu-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/qemu-devel
Re: [Qemu-devel] Re: [RFC] qemu-gui based on wxWidgets and libvncclient
Anthony Liguori wrote: Johannes Schindelin wrote: Hi, On Tue, 17 Oct 2006, Fabrice Bellard wrote: Another point is that you should consider adding audio support. I can help you on that (maybe malc would be interested too !). A simple format could be 4 bit ADPCM at fixed frequency. Optionally A more advanced codec such as Vorbis could be used. Please, please not _another_ vnc hack! The RFB protocol loses all of its appeal if everybody has proprietary, incompatible extensions! If you bother to search Google for prior art, here is a link: http://www.ks.uni-freiburg.de/php_arbeitdet.php?id=75 Yes, it is in German, but it already works. No need to add yet another obscure extension. My German is not very good, but from what I was able to read, it seems like they are just using VNC to transmit the port information for doing esd forwarding. Presumably this saved a lot of work because no server side code was needed. I would prefer a self contained solution using the same TCP connection as the rest of the protocol. Regards, Fabrice. ___ Qemu-devel mailing list Qemu-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/qemu-devel
Re: [Qemu-devel] Re: [RFC] qemu-gui based on wxWidgets and libvncclient
Please, please not _another_ vnc hack! The RFB protocol loses all of its appeal if everybody has proprietary, incompatible extensions! If you bother to search Google for prior art, here is a link: http://www.ks.uni-freiburg.de/php_arbeitdet.php?id=75 Yes, it is in German, but it already works. No need to add yet another obscure extension. My German is not very good, but from what I was able to read, it seems like they are just using VNC to transmit the port information for doing esd forwarding. Presumably this saved a lot of work because no server side code was needed. I would prefer a self contained solution using the same TCP connection as the rest of the protocol. Regards, Fabrice. Video and audio data have different needs, so two connections would allow one transfering real-time data (maybe without error correction) for audio, the other can transfer VNC video data (no need for high priority real-time, but for error free transmission). Of course, sometimes a single connection makes things much easier (for example behind a firewall)... Regards, Stefan ___ Qemu-devel mailing list Qemu-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/qemu-devel
Re: [Qemu-devel] Re: [RFC] qemu-gui based on wxWidgets and libvncclient
Hi, On Tue, 17 Oct 2006, Fabrice Bellard wrote: Another point is that you should consider adding audio support. I can help you on that (maybe malc would be interested too !). A simple format could be 4 bit ADPCM at fixed frequency. Optionally A more advanced codec such as Vorbis could be used. Please, please not _another_ vnc hack! The RFB protocol loses all of its appeal if everybody has proprietary, incompatible extensions! If you bother to search Google for prior art, here is a link: http://www.ks.uni-freiburg.de/php_arbeitdet.php?id=75 Yes, it is in German, but it already works. No need to add yet another obscure extension. Ciao, Dscho ___ Qemu-devel mailing list Qemu-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/qemu-devel
Re: [Qemu-devel] Re: [RFC] qemu-gui based on wxWidgets and libvncclient
On Wed, 18 Oct 2006, Johannes Schindelin wrote: Hi, On Tue, 17 Oct 2006, Fabrice Bellard wrote: Another point is that you should consider adding audio support. I can help you on that (maybe malc would be interested too !). A simple format could be 4 bit ADPCM at fixed frequency. Optionally A more advanced codec such as Vorbis could be used. I am certainly ready to give a helping hand to anyone who attempts something to that effect. Please, please not _another_ vnc hack! The RFB protocol loses all of its appeal if everybody has proprietary, incompatible extensions! If you bother to search Google for prior art, here is a link: http://www.ks.uni-freiburg.de/php_arbeitdet.php?id=75 Yes, it is in German, but it already works. No need to add yet another obscure extension. Schade das mein Deutsch ...ehh... isn't basically up to scratch. -- vale ___ Qemu-devel mailing list Qemu-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/qemu-devel
Re: [Qemu-devel] Re: [RFC] qemu-gui based on wxWidgets and libvncclient
On Sun, 2006-10-15 at 22:56 -0500, Anthony Liguori wrote: Marc André Tanner wrote: Hi, During the last few weeks i was playing around with the idea to implement a GUI for qemu and so this is what i came up with. Cool. You should checkout virt-manager. It has much the same mission as what you describe. Ok, i will check it out, what is the state of the libvirt backend for qemu? Since i am still pretty new to C/C++ development (in fact i would call this my first real world C++ application) and not familiar with qemu internals i decided to implement the GUI independent of qemu itself. So from a technically point of view i just call qemu with arguments to redirect the monitor to stdio and to export the display to vnc (-monitor stdio -vnc display). I then try to capture and embed the vnc display within the GUI that's where libvncclient[1] comes in. I have no experience with libvncclient. I think the general idea of using VNC to create an external QEMU GUI is a good one. Yep, although the performance will obviously be a bit slower. Previously, I had posted some patches for a shmem GUI that used a custom control channel. After hacking on that for a little bit based on some feedback, I've come full circle and am now under the view that extending VNC is a better long term approach. So, I've reserved some pseudo-encodings and a client message type and am now working on some VNC extensions to enable better QEMU integration. My current client code is available at: http://hg.codemonkey.ws/vnc-gui/ The VNC extensions are still a work in progress but documentation is here: http://tocm.wikidot.com/vncextensions Regards, Anthony Liguori If i find some time, i will take a look at it. Anyway if someone has comments about my libvncclient based code, please share them. Regards, Marc ___ Qemu-devel mailing list Qemu-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/qemu-devel
Re: [Qemu-devel] Re: [RFC] qemu-gui based on wxWidgets and libvncclient
On Tue, Oct 17, 2006 at 11:10:00PM +0200, Marc Andr? Tanner wrote: On Sun, 2006-10-15 at 22:56 -0500, Anthony Liguori wrote: Marc André Tanner wrote: Hi, During the last few weeks i was playing around with the idea to implement a GUI for qemu and so this is what i came up with. Cool. You should checkout virt-manager. It has much the same mission as what you describe. Ok, i will check it out, what is the state of the libvirt backend for qemu? I did an initial prototype patch to validate the design / approach. This now needs to be cleaned up to a state suitable for inclusion in libvirt CVS repo. My goal is to get QEMU support in an official libvirt release within the next 3-6 months, so that I can make it into Fedora Core 7. There'll be a little incremental work to virt-manager once the libvirt QEMU bits are done, but I don't expect that to cover anything difficult - just tweaking the install wizard to enable the options that are relevant for QEMU VMs. Regards, Dan. -- |=- Red Hat, Engineering, Emerging Technologies, Boston. +1 978 392 2496 -=| |=- Perl modules: http://search.cpan.org/~danberr/ -=| |=- Projects: http://freshmeat.net/~danielpb/ -=| |=- GnuPG: 7D3B9505 F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 -=| ___ Qemu-devel mailing list Qemu-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/qemu-devel
