[mythtv-users] SA3250 Channel Change over Firewire

[John Hannan]

thanks, I had seen your thread from a while back.  I'll take a closer look
at it this weekend...it sounds like the updates were applied to the contrib
directory so they should already be in there. but you never know.

John

On 5/22/07, Allan Wilson <allanwilson at gmail.com> wrote:
>
> I had this problem back in the day and now it works if you use firewire to
> view the content. Here is something from the thread. If this doesn't help
> let me know and I'll try to pull out my notes. It is a patch that you can
> apply with the diff command.
>
> Brian Meehan wrote:
> > I've been watching this discussion in hopes of learning something to
> > get my firewire capture running too. I also have no picture, but I've
> > noticed that the channel changing is crazy. I have channel 09 set as
> > the startup channel for firewire input (local cable news broadcast,
> > probably not 5C encrypted). The SA3250 changes the channel to 48. ???!
> > When I set it to channel 508 (G4 TV) it changes to 13hundred
> > something. But it's always consistent. Channel 9 is always channel 48.
> > Channel 508 is always that 13xx channel. I'll try some more and see if
> > I can find a pattern.
> >
> > Could that be the patched channel changer you were talking about? I'm
> > running Myth from ATRPMs on FC5.
>
> The behavior you are seeing is similar to what I saw when I allowed
> mythbackend
> to use its internal channel changing code for my SA3250HD.  I too would
> get
> changes to channel 48 for a lot of different channels I tested on.
>
> I am attaching the diff for my changes to mythtv/contrib/sa3250ch.c.
>
> You'd have to grab sa3250cs.c from svn, patch it, compile it, and install
> it
> somewhere, then in the mythtv-setup screen (I believe it's when you link
> the
> video source to the capture card) where you can define an external change
> channel command, you put the full path to sa3250ch that you built and
> installed.
>
> I got this patch from someone in the #mythtv-users channel.  Their
> SA3250HD had
> a different vendor id as displayed when using gscanbus, so they updated
> the
> sa3250ch.c to recognize the particular vendor id of their hardware.  Mine
> matched the vendor id already in sa3250ch.c, so I left it alone and just
> made
> the changes to the code that sends the commands.
> - Show quoted text -
>
>
> -matt
>
> --
> matt mead
>
> http://collectivity.goof.com/
>
> *** sa3250ch.c.orig     2006-04-07 18:01:29.000000000 -0400
> --- sa3250ch.c  2006-04-18 21:50:33.000000000 -0400
> ***************
> *** 121,127 ****
> --- 121,130 ----
>     dig[0] = 0x30 | ((chn % 1000) / 100);
>
>     cmd[0] = CTL_CMD0 | AVC1394_SA3250_OPERAND_KEY_PRESS;
> +    /* MCM
>     cmd[1] = CTL_CMD1 | (dig[0] << 16) | (dig[1] << 8) | dig[2];
> +    */
> +    cmd[1] = CTL_CMD1 | (chn << 8);
>     cmd[2] = CTL_CMD2;
>
>     if (verbose)
> ***************
> *** 130,135 ****
> --- 133,140 ----
>
>     avc1394_transaction_block(handle, 0, cmd, 3, 1);
>     cmd[0] = CTL_CMD0 | AVC1394_SA3250_OPERAND_KEY_RELEASE;
> +    cmd[1] = CTL_CMD1 | (chn << 8);
> +    cmd[2] = CTL_CMD2;
>
>     if (verbose)
>        printf("AV/C Command: %d%d%d = cmd0=0x%08x cmd2=0x%08x
> cmd3=0x%08x\n",
>
>
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