I have a Samsung USB Power Supply Pack for my camera. It plugs into a mains socket on the wall, then to the camera via a Samsung cable. The cable connnects to the power pack via a USB series A socket (just visible in the lower right of the picture in the link). At least it looks like a USB-A socket; and the cable can also be used to connect the camera as an external USB drive to the laptop.
My question is: does the USB standard cover this kind of device/power supply so that any device that I could charge by plugging it into a USB socket on my computer would be compliant with the camera power supply pack? For example I have a small MP3 player that I recharge by plugging into the USB socket on my laptop. Could I safely plug it into the camera power pack? What about other devices?
Thanks for advice.