[mythtv] Patch proposal for XvMC videoout_xvmc.cpp

[Carl Nordbeck]

Hi!

I am trying to use Nvidia's driver with XvMC.
The display is an old PAL-TV(interlaced) with SCART connector that have
RGB input so this is connected to the first head of the video-card. The
second head is a standard VGA monitor.

With this setup, myth seems unstable and sometimes the kernel deadlock.
Video is very crisp and clear but very jittery. Th

When using interlaced output the refresh_interval can be doubled, this
seems to solve the deadlocks for me.

Then turn on BOB filter and I get reasonably good picture. 50 half
frames per second.

There is also an X error when requesting the XvAttribute.
My knowledge about X is zero but this seems to work?

/BR
Carl Nordbeck

Index: libs/libmythtv/videoout_xvmc.cpp
===================================================================
RCS file: /var/lib/mythcvs/mythtv/libs/libmythtv/videoout_xvmc.cpp,v
retrieving revision 1.49
diff -r1.49 videoout_xvmc.cpp
231,232c231,234
<
<     rate = 1000000.0 / rate;
---
>     if (mode_line.flags && 0x010 ) // #define V_INTERLACE      0x010
>       rate = 1000000.0 / (rate * 2);
>     else
>       rate = 1000000.0 / rate;
547c549
<     attributes = XvQueryPortAttributes(data->XJ_disp, xv_port,
&attrib_count);
---
>     attributes = XvMCQueryAttributes(data->XJ_disp, &(data->ctx),
&attrib_count);
560c562
<                     XvSetPortAttribute(data->XJ_disp, xv_port,
xv_atom, 0);
---
>                     XvMCSetAttribute(data->XJ_disp, &(data->ctx),
xv_atom, 0);
562c564
<                     XvSetPortAttribute(data->XJ_disp, xv_port,
xv_atom, 1);
---
>                     XvMCSetAttribute(data->XJ_disp, &(data->ctx),
xv_atom, 1);
573c575
<             ret = XvGetPortAttribute(data->XJ_disp, xv_port, xv_atom,
---
>             ret = XvMCGetAttribute(data->XJ_disp, &(data->ctx),
xv_atom,

--