From: Andreas Oberritter <obi@linuxtv.org>
To: Christophe Thommeret <hftom@free.fr>
Cc: linux-dvb@linuxtv.org
Subject: Re: [linux-dvb] [PATCH] cx24116 DVB-S modulation fix
Date: Tue, 14 Oct 2008 23:05:45 +0200 [thread overview]
Message-ID: <48F509A9.1030103@linuxtv.org> (raw)
In-Reply-To: <200810141451.02941.hftom@free.fr>
Christophe Thommeret wrote:
> dvbscan initial tuning data files for DVB-S don't have an entry for
> modulation. So an app like kaffeine simply set modulation to QAM_AUTO.
> Why not QPSK, you ask? Simply because DVB-S standard allows QPSK and 16QAM.
> Maybe there is not a single 16QAM TP all over the world, but it's still a
> valid modulation for DVB-S.
> So, we set modulation to QAM_AUTO when it's unknown/unspecified, like in
> dvbscan files (those being also used by kaffeine). And it works pretty well,
> just because most dvb-s can only do QPSK and so force modulation to QPSK
> instead of returning a notsup.
> See this as software QAM_AUTO :)
It simply doesn't make sense to specify QAM_AUTO if dvb_frontend_info.caps
doesn't contain FE_CAN_QAM_AUTO (or FE_CAN_QAM_16 for that matter).
Regards,
Andreas
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prev parent reply other threads:[~2008-10-14 21:05 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-14 9:33 [linux-dvb] [PATCH] cx24116 DVB-S modulation fix Christophe Thommeret
2008-10-14 10:29 ` Darron Broad
2008-10-14 12:51 ` Christophe Thommeret
2008-10-14 15:10 ` Steven Toth
2008-10-14 17:02 ` Darron Broad
2008-10-15 16:46 ` Christophe Thommeret
2008-10-15 17:22 ` Darron Broad
2008-10-15 18:59 ` Christophe Thommeret
2008-10-14 21:05 ` Andreas Oberritter [this message]
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