[vdr] VDR needs some way to detect new tuners on runtime...

Klaus Schmidinger Klaus.Schmidinger at tvdr.de
Tue Aug 20 10:42:03 CEST 2013


On 20.08.2013 10:20, Manuel Reimer wrote:
> On 08/20/2013 10:12 AM, Klaus Schmidinger wrote:
>>> So my question to Klaus: Is there something like this planned or would
>>> a patch be accepted which adds a feature like this? As far as I know a
>>> new dependency (libudev) would be needed.
>>
>> I wouldn't like to add a dependency to libudev.
>
> So how could an alternative approach look like? Maybe it could work with "inotify" to see when new devices are added below /dev, but I think this will also require new dependencies.
>
> The easiest way may be: Call the existing code for finding the tuners not only once but every X seconds.
>
>>    NUMADAPTERS=3
>>    while [[ `find /dev/dvb -name 'adapter*' | wc -l` -lt $NUMADAPTERS
>> ]]; do sleep 1; done
>>    runvdr ...
>>
>> could be used to count the number of adapters, and check that number in
>> a loop
>> against the expected number of adapters.
>
> This works for *one* system and only if the user manually sets the number of adapters. How could this be done in a "automagic" way to allow users to just plug the tuner and reboot?

As I wrote before, VDR needs all devices to be ready when it starts, otherwise
any configuration parameters that refer to "device numbers" might not work.
So I guess you'll have to figure out some way of waiting for all devices to be
ready before starting VDR.

Klaus



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