awalls at radix
Feb 28, 2010, 3:51 PM
Post #3 of 3
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Re: adjusting height (576>480) when changing video standard?
[In reply to]
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On Sun, 2010-02-28 at 23:32 +0100, Martin Dauskardt wrote:
> answering my own question:
> The ivtv drivers does change the size from 720x576 to 720x480 automatically
> when I change the video standard to PAL-60
Just fuirther confirming that is correct; here's a short snippet of code
from ivtv-ioctl.c:ivtv_s_std():
itv->std = *std;
itv->is_60hz = (*std & V4L2_STD_525_60) ? 1 : 0;
itv->params.is_50hz = itv->is_50hz = !itv->is_60hz;
itv->params.width = 720;
itv->params.height = itv->is_50hz ? 576 : 480;
itv->params are the MPEG encoder parameters.
The function then goes on to call the subdevices:
ivtv_call_all(itv, core, s_std, itv->std);
which should call the s_std method in the saa7115 or cx25840 (or
whatever) module.
Both the saa7115 and cx25840 module change the number of lines in
response to a video standard change.
Regards,
Andy
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