Date: Sun, 17 Aug 1997 12:19:55 -0600 From: Steve Passe <smp@csn.net> To: Kyle Mestery <mestery@winternet.com> Cc: Amancio Hasty <hasty@rah.star-gate.com>, Kenneth Merry <ken@gt.ed.net>, freebsd-multimedia@FreeBSD.ORG Subject: Re: Problem with my Wincast, fxtv Message-ID: <199708171819.MAA07175@Ilsa.StevesCafe.com> In-Reply-To: Your message of "Sun, 17 Aug 1997 12:12:54 CDT." <Pine.GSO.3.96.970817120641.10650A-100000@tundra.winternet.com>
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Hi,
Well, if your feeling adverturous perhaps you should write a simple channel
scanner. its something the driver could use.
b4 doing that, try turning on AFC (auto freq control) I think fxtv has a menu
item for that, but if not, use ioctl TVTUNER_SETAFC. this will cause the
tuner code to adjust the selected frequency within a +-5 mHz range while
polling the hardware for a "centered" signal.
---
if that doesn't help a crude userland auto scan would be something like:
******************** THE FOLLOWING IS ALL THEORY ***********************
#define AFC_BITS 0x07
#define AFC_FREQ_MINUS_125 0x00
#define AFC_FREQ_MINUS_62 0x01
#define AFC_FREQ_CENTERED 0x02
#define AFC_FREQ_PLUS_62 0x03
#define AFC_FREQ_PLUS_125 0x04
#define BOTTOM (unsigned long)(55.25 * 16)
#define TOP (unsigned long)(655.25 * 16)
int afcon = 1;
unsigned long freq, freq2, status;
int fd;
fd = open( ... );
if ( ioctl( fd, TVTUNER_SETAFC, &afcon ) < 0 ) {
ERROR;
}
for ( freq = BOTTOM; freq < TOP; freq += (6.0 * 16) )
{
printf( "\ntrying freq: %f", (double)((double)freq / 16.0) );
if ( ioctl( fd, TVTUNER_SETFREQ, &freq ) < 0 ) {
ERROR;
}
if ( ioctl( fd, TVTUNER_GETFREQ, &freq2 ) < 0 ) {
ERROR;
}
if ( ioctl( fd, TVTUNER_GETSTATUS, &status ) < 0 ) {
ERROR;
}
if ( !(status & 0x40) ) {
printf( ", no lock (?)\n" );
sleep( 1 );
continue;
}
/** XXX not sure about the / 16 */
printf( "\nafc picked freq: %f", (double)((double)freq2 / 16.0) );
printf( ", hit return to continue..." );
gets();
}
--
Steve Passe | powered by
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