From: "Aleksandr V. Piskunov" <aleksandr.v.piskunov@gmail.com>
To: Mauro Carvalho Chehab <mchehab@infradead.org>
Cc: "Aleksandr V. Piskunov" <aleksandr.v.piskunov@gmail.com>,
linux-media@vger.kernel.org
Subject: Re: xc2028 sound carrier detection
Date: Wed, 23 Sep 2009 22:28:10 +0300 [thread overview]
Message-ID: <20090923192810.GA4653@moon> (raw)
In-Reply-To: <20090921215238.2e189d60@pedra.chehab.org>
On Mon, Sep 21, 2009 at 09:52:38PM -0300, Mauro Carvalho Chehab wrote:
> Em Tue, 22 Sep 2009 01:37:51 +0300
> "Aleksandr V. Piskunov" <aleksandr.v.piskunov@gmail.com> escreveu:
>
> > Is xc2028 tuner able to autodetect/handle different sound carrier standards
> > without being spoon-fed precise input system information using module param
> > or ioctl?
> >
> > Got an ivtv board here (AverTV MCE 116) with xc2028 and cx25843.
> >
> > When I specify a generic standard using 'v4l2-ctl -s pal', xc2028 loads
> > firmware specific to PAL-BG, so if there is an PAL-DK or PAL-I signal on RF
> > input... nice picture but no sound. Setting a more precise standard like
> > 'v4l2-ctl -s pal-dk' fixes the issue, but other PAL-BG or PAL-I channels
> > loose sound.
> >
> > Bttv board with a tin-can tuner sitting on the same RF source autodetects
> > PAL-BG, PAL-DK and PAL-I without any manual intervention.
> >
> > So any voodoo tricks to get the autodetection running?
>
> No, sorry. It requires specific and different firmwares based on your video
> standard. I suspect that it is due to some firmware limiting size, since newer
> products from Xceive, like xc5000 don't have such troubles, but this is just my
> guess.
Mmm, tested that tuner under windows, it autodetects all 3 sound carrier sub-
standards instantly: PAL-BG, PAL-DK, PAL-I.
In order to test, I connected ancient Panasonic VCR that has a built-in tuner
and can output video to RF-OUT on fixed frequency using PAL standard. Sound
carrier frequency can be choosen using hardware switch BG, DK or I.
So under windows: tuner produces clear audio in BG, DK and I, hardware switch
can be toggled on fly, audio never stops, only a few miliseconds of static on
switch.
Under linux: audio only works if driver is set to use specific audio carrier
sub-standard AND same is selected on PVR. (not to mention extremely unreliable
PAL-DK detection by cx25843, only works 50% of times, but thats another issue)
Either a more generic firmware exists can be uploaded on xc2028.. or several
can be uploaded at once. Any xc2028 gurus out there?
next prev parent reply other threads:[~2009-09-23 19:28 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-21 22:37 xc2028 sound carrier detection Aleksandr V. Piskunov
[not found] ` <20090921215238.2e189d60@pedra.chehab.org>
2009-09-23 19:28 ` Aleksandr V. Piskunov [this message]
2009-09-23 21:27 ` Devin Heitmueller
2009-09-25 21:03 ` Aleksandr V. Piskunov
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