Hi Laurent, I have a query for you regarding the support and testing of MJPEG frame type in the UVC webcam gadget.
I see that in the webcam.c gadget, the 720p and VGA MJPEG uvc formats are supported. I was trying the same out and got confused because the data arriving from a real video capture video supporting JPEG will have no fixed size. We will have the JPEG defined Start-of-Frame and End-of-Frame markers defining the boundary of the JPEG frame. But for almost all JPEG video capture devices even if we have kept a frame size of VGA initially, the final frame size will be a compressed version (with the compression depending on the nature of the scene, so a flat scene will have high compression and hence less frame size) of VGA and will not be equal to 640 * 480. So I couldn't exactly get why the dwMaxVideoFrameBufferSize is kept as 614400 in webcam.c (see [1]). Can you please let me know your opinions and how you tested the UVC gadget's MJPEG frame format. [1] http://lxr.linux.no/linux+v3.5/drivers/usb/gadget/webcam.c#L232 Thanks, Bhupesh -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
