You got it! Thanks for the example!! :-)
________________________________ From: Josiah Bryan <josiahbr...@gmail.com> To: Jason H <scorp...@yahoo.com> Cc: Lopes Yoann <yoann.lo...@digia.com>; "evazq...@grm.uci.cu" <evazq...@grm.uci.cu>; "interest@qt-project.org" <interest@qt-project.org> Sent: Tuesday, September 17, 2013 10:04 AM Subject: Re: [Interest] About usb cameras I created a class I called "VideoSurfaceAdapter" which inherits from a QAbstractVideoSurface which allows me access to the raw frames. See https://code.google.com/p/livepro/source/browse/trunk/gfxengine/QtVideoSource.cpp for the code. Basically, in supportedPixelFormats() I return the formats I'll support, and then in present(...), I do the conversion using QImage - the code is all in the link above. I hope this helps - forgive me if I misunderstood your problem. On Tue, Sep 17, 2013 at 9:52 AM, Jason H <scorp...@yahoo.com> wrote: Thanks, but I am still not clear. > > >If I subclass QAbstractVideoSurface (video probe is out - I need it on >Windows) How do I get it into a QImage/Pixmap? >I am guessing that I would set the pixel format for it to be the same as for >QImage? According to the that logic and the docs, there are a few formats that >will work: >Format_ARGB32, Format_ARGB32_Premultiplied, Format_RGB32, Format_RGB555, >Format_ARGB8565_Premultiplied > > > >But will Qt do the conversion (if so how? lines of code please!). Do I tell >the video source to give me a format? Does that format have to be supported by >the device? > > >I don't mind updating the screen, as I will be generating an overlay. and >pushing that to the screen. > > >Thanks! > > > > > >________________________________ > From: Lopes Yoann <yoann.lo...@digia.com> >To: Jason H <scorp...@yahoo.com> >Cc: "evazq...@grm.uci.cu" <evazq...@grm.uci.cu>; "interest@qt-project.org" ><interest@qt-project.org> >Sent: Tuesday, September 17, 2013 7:18 AM > >Subject: Re: [Interest] About usb cameras > > > >On Sep 16, 2013, at 5:46 PM, Jason H wrote: >Can someone tell me how to grab a frame and what is needed to be done to get >to the point where I can do image processing easily? > >With the C++ API you can use QVideoProbe >(http://qt-project.org/doc/qt-5.0/qtmultimedia/qvideoprobe.html). Though, with >a camera source, it will currently work only on Linux with the GStreamer >backend. The frames can be in any format, including an OpenGL texture, and >you'll have to to convert it to a QImage yourself if it's what you want to do. > > >You can also subclass QAbstractVideoSurface >(http://qt-project.org/doc/qt-5.0/qtmultimedia/qabstractvideosurface.html). It >will work on all platforms and you will be able to specify the format of the >received frames with supportedPixelFormats(). You will also have to take care >of showing the frames on screen youself... > > >Yoann Lopes >Senior Software Engineer - Digia, Qt >Visit us on: http://qt.digia.com > > >_______________________________________________ >Interest mailing list >Interest@qt-project.org >http://lists.qt-project.org/mailman/listinfo/interest > > -- Josiah Bryan 765-215-0511 josiahbr...@gmail.com
_______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
