How to Implement Gstreamer with QObject model
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Hi Guys ,
I heard that Gstreamer works on GObject model . Is it possible to integrate Gstreamer with QEventLoop ie ., QObject model? In GObject model ,while playing the pipeline . we use g_main_loop_new() api to get a GMainLoop pointer .
& then we will add an buscall watch to catch EOS & we will quit the mainloop using g_main_loop_quit() api. In QObject Model , does we need to use QEventLoop pointer or How does it goes?
Do we have Gstreamer documentation / tutorials wrt to QObject model . Pls le t me know . Regards, Suman.
------------------------------------------------------------------------------ Nokia and AT&T present the 2010 Calling All Innovators-North America contest Create new apps & games for the Nokia N8 for consumers in U.S. and Canada $10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store http://p.sf.net/sfu/nokia-dev2dev _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
Re: How to Implement Gstreamer with QObject model
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On Wed, Oct 27, 2010 at 3:06 PM, namus <[hidden email]> wrote:
> Hi Guys , > I heard that Gstreamer works on GObject model . > Is it possible to integrate Gstreamer with QEventLoop ie ., QObject model? > In GObject model ,while playing the pipeline . we use g_main_loop_new() api > to get a GMainLoop pointer . > & then we will add an buscall watch to catch EOS & we will quit the mainloop > using g_main_loop_quit() api. > In QObject Model , does we need to use QEventLoop pointer or How does it > goes? > Do we have Gstreamer documentation / tutorials wrt to QObject model . > Pls le t me know . > Regards, > Suman. As far as I know the only thing that needs integration with the QEventLoop is the bus messages. On X11, if Qt is compiled with GLib support enabled, it is possible to use the GStreamer API without doing anything else, just like you would use it with GLib/GObject. On other platforms (and X11 with GLib support disabled), you need to poll the bus for messages from the Qt event loop. You might be interested in QtGStreamer [1], which already has this kind of integration with the Qt event loop. Note that this library is still a work in progress and it has no compatibility promises yet. Regards, George [1]. http://gitorious.org/qtgstreamer ------------------------------------------------------------------------------ Nokia and AT&T present the 2010 Calling All Innovators-North America contest Create new apps & games for the Nokia N8 for consumers in U.S. and Canada $10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store http://p.sf.net/sfu/nokia-dev2dev _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
Re: How to Implement Gstreamer with QObject model
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In reply to this post by namus
On Wed, Oct 27, 2010 at 5:06 AM, namus <[hidden email]> wrote:
> Hi Guys , > I heard that Gstreamer works on GObject model . > Is it possible to integrate Gstreamer with QEventLoop ie ., QObject model? > In GObject model ,while playing the pipeline . we use g_main_loop_new() api > to get a GMainLoop pointer . > & then we will add an buscall watch to catch EOS & we will quit the mainloop > using g_main_loop_quit() api. > In QObject Model , does we need to use QEventLoop pointer or How does it > goes? You don't need to use GMainLoop with GStreamer - that part of the API is optional. There are lots of other ways to receive bus messages. Mike ------------------------------------------------------------------------------ Nokia and AT&T present the 2010 Calling All Innovators-North America contest Create new apps & games for the Nokia N8 for consumers in U.S. and Canada $10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store http://p.sf.net/sfu/nokia-dev2dev _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
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Hi Guys,
let me know ..how to catch the bus messages without gmainloop? How will the other methods differ from gmainloop mechanism? And just for curiosity ..
1.Can I define my own looping mechanism.. what can be the design considerations for designing my own looping mechanism? (may be out of topic .. but just wanted to know .. is this similar to "creating a deamon" ? ..)
Any tutorial/documents will be helpful to me . Regards, Suman. On Wed, Oct 27, 2010 at 3:29 PM, Michael Smith <[hidden email]> wrote:
------------------------------------------------------------------------------ Nokia and AT&T present the 2010 Calling All Innovators-North America contest Create new apps & games for the Nokia N8 for consumers in U.S. and Canada $10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store http://p.sf.net/sfu/nokia-dev2dev _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
Re: How to Implement Gstreamer with QObject model
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Hi Suman,
Have you considered the Phonon framework? It provides a nice object oriented framework for multimedia while using GStreamer as the backend? Regards, Cedric On Oct 28, 2010, at 2:02 PM, namus wrote: Hi Guys, ------------------------------------------------------------------------------ Nokia and AT&T present the 2010 Calling All Innovators-North America contest Create new apps & games for the Nokia N8 for consumers in U.S. and Canada $10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store http://p.sf.net/sfu/nokia-dev2dev _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
Re: How to Implement Gstreamer with QObject model
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In reply to this post by namus
On Thu, Oct 28, 2010 at 3:02 PM, namus <[hidden email]> wrote:
> Hi Guys, > let me know ..how to catch the bus messages without gmainloop? Using gst_bus_pop() or the "sync-message" signal. > How will the other methods differ from gmainloop mechanism? gst_bus_pop() is the same thing if you call it from the main thread. Actually, the GMainLoop integration code calls gst_bus_pop() periodically from the event loop and emits the "message" signal on the bus if it finds that a new message has arrived. The "sync-message" signal is a different thing, it delivers the message on the same thread that it is sent from and it is not a good idea to use it unless you need it. > And just for curiosity .. > 1.Can I define my own looping mechanism.. > what can be the design considerations for designing my own looping > mechanism? > (may be out of topic .. but just wanted to know .. is this similar to > "creating a deamon" ? ..) > Any tutorial/documents will be helpful to me . Yes, you can. You can use a QTimer or something similar that expires every once in a while and calls a slot that uses gst_bus_pop() to poll for new messages. This is essentially what the GMainLoop integration code does as well. You can use this as an example: http://gitorious.org/qtgstreamer/qtgstreamer/blobs/master/src/QGst/bus.cpp Regards, George ------------------------------------------------------------------------------ Nokia and AT&T present the 2010 Calling All Innovators-North America contest Create new apps & games for the Nokia N8 for consumers in U.S. and Canada $10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store http://p.sf.net/sfu/nokia-dev2dev _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
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In reply to this post by namus
You can find one gstreamer test application developed using qt here : http://gstreamer-devel.966125.n4.nabble.com/how-to-make-gstreamer-run-in-separate-thread-tt1960435.html#a2174062
Always update the qt's UI elements esp pixmaps etc., only from qt event loop.
--vineeth On Wed, Oct 27, 2010 at 5:36 PM, namus <[hidden email]> wrote: Hi Guys , ------------------------------------------------------------------------------ Nokia and AT&T present the 2010 Calling All Innovators-North America contest Create new apps & games for the Nokia N8 for consumers in U.S. and Canada $10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store http://p.sf.net/sfu/nokia-dev2dev _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
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