On Sun, Oct 04, 2015 at 12:23:08PM +0300, Matwey V. Kornilov wrote: > Hello, > > I learned from V2L2 API how to detect all supported formats using > VIDIOC_ENUM_FMT. > When I perform VIDIOC_S_FMT I don't know how to fill fmt.pix.width and > fmt.pix.height, since I know only format. > How should I negotiate device resolution? Could you point me? VIDIOC_ENUM_FRAMESIZES may give you hints, but it's optional. You can use values you prefer to try if drivers support them; I think the GStreamer v4lsrc tries very small and very large values. The driver will clamp them to a supported values which are passed to the application from the IOCTL. <URL:http://hverkuil.home.xs4all.nl/spec/media.html#vidioc-enum-framesizes> -- Regards, Sakari Ailus e-mail: sakari.ailus@xxxxxx XMPP: sailus@xxxxxxxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
