On Wed, 27 Aug 2008, Daniel [iso-8859-1] Gl�ckner wrote:
On Mon, Aug 25, 2008 at 08:40:51PM -0400, Andy Walls wrote:
On Mon, 2008-08-25 at 14:45 +0200, Jean Delvare wrote:
The driver fills buffers with instructions for the DMA engine, one buffer
for the top field and one for the bottom field. These instructions tell
the engine where to write a specific pixel. For interlaced video the
instructions for the top field write to line 0, 2, 4, ... in memory and for
the bottom field to line 1, 3, 5, ... .
Keep in mind that _either_ field can be transmitted first. I.e., in some
cases one first writes lines 1,3,5 then lines 0,2,4. I'm not sure if bttv
supports both field dominances or not, but I think it does.