[pvrusb2] Channel-change script

[Per Christian Henden]

On Sunday 11 September 2005 01:42, Per Christian Henden wrote:
> On Sunday 11 September 2005 01:14, Mike Isely wrote:
> > With your permission I will add this to the pvrusb2 driver snapshot.
>
> Sure, go ahead.
> I'm not using ctl_freq_table_channel and ctl_freq_table_value
> with this script, didn't notice them until after I sent the script to the
> list.
>
> But if the frequencies file exists,
> then we can just do
>
> #!/bin/bash
> i=0
> freqlist=`cat ~perchrh/.tv/freqs|grep freq|cut -c 8-`
> for freq in $freqlist
> do
>    echo $i > ctl_freq_table_channel/cur_val
>    echo ${freq}000 > ctl_freq_table_value/cur_val
>    let i++
> done
>
> to create the table.
>
> I don't notice any difference in speed or anything when changing
> channels by setting the frequency in ctl_freq_table_value
> and by programming in the table and using ctl_channel.
> Is there a difference in what code gets executed by the driver?

To answer this myself: 
It seems that there sometimes is a difference, not sure under what conditions, 
but audio from the previous channel plays for a little while when changing 
channels by changing the frequency directly, i.e., when not using the 
ctl_channel control.
So a script/program for changing channels should use the ctl_channel control.

> > It also seems like it might be useful to script the creation of the
> > mapping file as well...
>
> Yes, definetely.

Unfortunately, I can't do that now. I have a problem with both arms 
(tendinitis) that gets worse when I use a mouse or a keyboard, so I try to 
use them as little as possible for now.

I have a setup now where I can change the channel by using the remote. 
I'll just send you what I have for now, and if anyone else wants to make it 
suitable for general use, go ahead.

I run irexec as root. 
/root/.lircrc contains 

    begin
        button = 1
        prog   = irexec
        repeat = 0
        config = /usr/local/bin/byttkanal 1
    end

    begin
        button = 2
        prog   = irexec
        repeat = 0
        config = /usr/local/bin/byttkanal 2
    end

and so on

byttkanal is the script for changing channels. 
It's obvious and looks like this

/// start byttkanal ///

#!/bin/sh

CHANNELID=$1

#check first if we are root
if [ $UID != "0" ]
   then
   echo You need to be root to change channels
   exit
fi

#check parameters
if [ $# == "0" ]
then
   echo Usage is $0 \<channel id\>
   echo e.g. $0 3
   exit
fi

if [ -x /sys/class/pvrusb2/ ]
then
ids=`find /sys/class/pvrusb2/ -type d -maxdepth 1 -mindepth 1`
   for id in $ids
   do
   echo $CHANNELID > $id/ctl_channel/cur_val
   done
else
echo PVR USB2 sysfs interface not found
fi
/// end byttkanal ///

To set up the channels I run 

/// start programtv///
#!/bin/bash

i=0
freqlist=`cat ~perchrh/.tv/freqs|grep freq|cut -c 8-`

for freq in $freqlist
do
echo $i > ctl_freq_table_channel/cur_val
echo ${freq}000 > ctl_freq_table_value/cur_val
let i++
done
/// end programtv ///

It assumes the existence of a frequency file, as described earlier in this 
thread.

-PER