Hi Hans, On Thursday 10 September 2009 17:00:40 Hans Verkuil wrote: > > On Thu, 10 Sep 2009, Hans Verkuil wrote: > > > > Could entities not be completely addressed (configuration ioctls) > > > > through the mc-node? > > > > > > Not sure what you mean. > > > > Instead of having a device node for each entity, the ioctls for each > > entities are done on the media controller-node address an entity by ID. > > I definitely don't want to go there. Use device nodes (video, fb, alsa, > dvb, etc) for streaming the actual media as we always did and use the > media controller for controlling the board. It keeps everything nicely > separate and clean. I agree with this, but I think it might be what Patrick meant as well. Beside enumeration and link setup, the media controller device will allow direct access to entities to get/set controls and formats. As such its API will overlap with the V4L2 control and format API. This is not a problem at all, both having different use cases (control/format at the V4L2 level are meant for "simple" applications in a backward-compatible fashion, and control/format at the media controller level are meant for power users). V4L2 devices will be used for streaming video as that's what they do best. We don't want a video streaming API at the media controller level (not completely true, as we are toying with the idea of shared video buffers, but that's for later). In the long term I can imagine the V4L2 control/format ioctls being deprecated and all control/format access being done through the media controller. That's very long term though. -- Laurent Pinchart -- 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
