Date: Fri, 25 Apr 1997 17:01:44 -0700 From: Amancio Hasty <hasty@rah.star-gate.com> To: Richard Tobin <richard@cogsci.ed.ac.uk> Cc: multimedia@freebsd.org Subject: Re: Fxtv 0.41 Message-ID: <199704260001.RAA10678@rah.star-gate.com> In-Reply-To: Your message of "Fri, 25 Apr 1997 18:04:28 BST." <199704251704.SAA29354@stevenson.cogsci.ed.ac.uk>
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Hi,
Here is the routine in question:
Setting bit 7 on bktr->tdec does exactly what you describe
This bit should be 0.
0 denotes decimating frames
1 denotes decimating fields.
static void
set_fps( bktr_ptr_t bktr, u_short fps )
{
bt848_ptr_t bt848;
bt848 = bktr->base;
bt848->gpio_dma_ctl = FIFO_RISC_DISABLED;
bt848->int_stat = ALL_INTS_CLEARED;
bktr->fps = fps;
if ( fps == 30 ) {
bt848->tdec = 0;
return;
} else {
bt848->tdec = (int) (((float) fps / 30.0) * 60.0) & 0x3f;
bt848->tdec |= 0x80;
}
if ( bktr->flags & METEOR_CAP_MASK ) {
bt848->int_stat = ALL_INTS_CLEARED;
bt848->risc_strt_add = vtophys(bktr->dma_prog);
bt848->gpio_dma_ctl = FIFO_ENABLED;
bt848->gpio_dma_ctl = bktr->capcontrol;
bt848->int_mask = BT848_INT_MYSTERYBIT |
BT848_INT_RISCI |
BT848_INT_VSYNC |
BT848_INT_FMTCHG;
}
return;
}
Patches are welcome and try not use floating point like I did.
Cheers,
Amancio
>From The Desk Of Richard Tobin :
> > I haven't noticed anything from the european/PAL people lately, are there
> > any PAL improvements laying around that need to be incorporated into
> > the driver?
>
> Not from me.
>
> The problems I thought I had turned out to be due to my cheapo S3
> virge card with DRAM not being able to handle the bandwidth, and the
> driver was losing lots of frames. If I reduce my X resolution,
> it works fine.
>
> Incidentally, the frames-per-second ioctl looks all wrong: it does
> "temporal decimation" by fields, which means that the RISC program
> doesn't see alternate odd-even fields as it expects. Also it assumes
> 60Hz. Can someone confirm that it doesn't work under NTSC either?
>
> I mailed Randall about adding channel-set selection to fxtv.
>
> -- Richard
>
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