Archived:PCI interface chipsets used for V4L cards
See also Conexant datasheet catalog.
The manufacturer of these chips was Brooktree, now Conexant.
In the Linux kernel, they are handled by the bttv module.
If you're mainly interested in the audio features of the bttv chips, see btaudio.
Some bt878 capture cards have a single chip on board and four inputs on he back of the card. In this case, don't expect multiple input devices. You would have multiple /dev/videoX if you actually had multiple videograbber devices - but you don't. You have one device (the 878A) with multiple inputs, of which only one at a time can be active. This input switching is done by means of the single /dev/videoX API.
The manufacturer of these chips is Philips.
In the Linux kernel, they are handled by the saa7134 module.
Also by Connexant, successor of the bt878 design. Handled by the cx88 driver(s).