On Sat, 2010-04-10 at 23:21 -0400, Mark Lord wrote:
> On 10/04/10 06:54 PM, Andy Walls wrote:
> >
> > Hmmm. Darren's having problems (loss of video/black screen) with my
> > patches under my cx18-audio repo, but I'm not quite convinced he doesn't
> > have some other PCI bus problem either.
> >
> > Anyway, my plan now is this:
> >
> > 1. on cx18-av-core.c:input_change()
> > a. set register 0x808 for audio autodetection
> > b. restart the format detection loop
> > c. set or reset a 1.5 second timeout
> >
> > 2. after the timer expires, if no audio standard was detected,
> > a. force the audio standard by programming register 0x808
> > (e.g. BTSC for NTSC-M)
> > b. restart the format detection loop so the micrcontroller will
> > do the unmute when it detects audio
> >
> > Darren is in NTSC-M/BTSC land. What TV standard are you dealing with?
> ..
>
> I'm in Canada, using the tuner for over-the-air NTSC broadcasts.
Try this:
http://linuxtv.org/hg/~awalls/cx18-audio2
this waits 1.5 seconds after an input/channel change to see if the audio
standard micrcontroller can detect the standard. If it can't, the
driver tells it to try a fallback detection. Right now, only the NTSC-M
fallback detection is set to force a mode (i.e. BTSC), all the others
"fall back" to their same auto-detection.
Some annoyances with the fallback to a forced audio standard, mode, and
format:
1. Static gets unmuted on stations with no signal. :(
2. I can't seem to force mode "MONO2 (LANGUAGE B)". I'm guessing the
microcontroller keeps setting it back down to "MONO1 (LANGUAGE A/Mono L
+R channel for BTSC, EIAJ, A2)" Feel free to experiment with the LSB of
the fallback setting magic number (0x1101) in
cx18-av-core.c:input_change().
Regards,
Andy
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