Natalia Hi, Please check guvcview source code: jpgenc.c; dct.c; huffman.c and also vcodecs.c(compress_frame) for a built in MJPG/JPG encoder.
Regards, Paulo 2010/6/16 Natalia Portillo <clau...@claunia.com>: > Hi, > > Continue with my creation of a UVC webcam inside the QEMU emulator, I've > found a behavior that makes me ask myself. > "Is the payload altered in anyway by the uvcvideo driver or the video4linux > api?" > > What I'm currently doing is, opening the host device (also UVC in my test > computer), setting format as 320x240 YUYV/YUY2, getting a frame (153600 > bytes), sending a payload header to the emulated system (2 bytes only, no > timestamp etc), sending the frame in 64 bytes chunks. > > However in the emulated system I'm getting a whole black frame (and really > slow). > > There seems to be any kind of difference between what a real camera is > sending me, and what I'm really getting, so I need one of two solutions: > > 1.- Getting that YUYV/YUY2 payload without differences, so I can resend it > "as is". > 2.- An easy way to convert it to MJPEG format. > > While I suppose something can be done with libjpeg, my first priority is to > avoid any external dependency, and I'm totally unfamiliar with that library. > > Any help, guidance, etc, will be greatly thanked. > > Regards, > Natalia Portillo > _______________________________________________ > Linux-uvc-devel mailing list > Linux-uvc-devel@lists.berlios.de > https://lists.berlios.de/mailman/listinfo/linux-uvc-devel > _______________________________________________ Linux-uvc-devel mailing list Linux-uvc-devel@lists.berlios.de https://lists.berlios.de/mailman/listinfo/linux-uvc-devel
