Hi Martin..
Try this:
In the mainline of your script.
isStarted = false
def dostartup() =
# We have started playing, so set the flag
isStarted := true
end
def handler()
if !isStarted then
system("/etc/liquidsoap/shut_on_blank.sh")
end
end
basically, when you want to set an external value from within a function
you use := instead of just =
when you want to reference it, put a ! (exclamation point) in front it of.
(and for 'completeness' you use something like this if you want it in
quotes "#{!alsaDevice}" )
Nick
On Wed, Dec 6, 2017 at 3:07 PM, Martin Knapp <[email protected]> wrote:
> Thanks again Nick, I really appreciate your help - and I feel pretty
> ashamed for not having found the documentation you‘ve pointed me to.
> Delaying shutdown with max_blank works perfectly, even with higher values
> (600) Regarding on_noise and the variables, I‘ve spent a couple of hours
> studying the documentation and the sample code, but didn‘t get very far.
> It‘s not trivial for a non-programmer like me with only some superficial
> php and perl knowledges. But I‘ll keep on trying.
> Thanks & best regards
> Martin
>
> Am 05.12.2017 um 22:41 schrieb Nicholas Vrtis <[email protected]>:
>
> Martin,
>
> If you look at the documentation for on_blank (http://liquidsoap.info/doc-
> dev/reference.html#on_blank), you can set the on_blank(max_blank=40.0,
> handler, phono)
>
> Note that max_blank takes a float, or you need the period.
>
> You can also specify an on_noise=dostartup
>
> So, what I would do is have the 'handler' check a Boolean to make sure the
> song has started, and only shutdown if it has.
>
> Then in the dostartup function, I would change the Boolean so that when
> 'handler' is called the next time (which would be after the end of the
> song), it would issue the shutdown.
>
> Check some of the examples on how to get and set a variable within
> functions.
>
> Nick
>
>
> On Tue, Dec 5, 2017 at 5:22 AM, Martin Knapp <[email protected]> wrote:
>
>> Hi,
>> it works! 30 seconds after finishing the playback the Raspi shuts down -
>> thanks again, Nick!
>> I imagine that 30 sec. is the default value. It's a little short,
>> however, when it comes to jumping of the sofa, running to the turntable and
>> put another record to play ;)
>> I've read that with Liquidsoap's blank operators you can fine-tune the
>> length and threshold parameters.
>> I have been trying to do so with on_blank, following the samples for
>> skip_blank etc.:
>>
>> source = on_blank(handler,length=120.,phono)
>>
>> The result is that Liquidsoap doesn't start any longer.
>>
>> Hence my questions (it seems that bthere is no documentation on the
>> on_blank params?):
>> 1. How can I define the minimum length a blank must have in order to be
>> recognized as such?
>> 2. How can I avoid that the shutdown script is triggered after starting
>> the Raspi and before any record has been played, e.g. in cases that it
>> takes longer to find the record, clean it etc.?
>>
>> In other words: The perfect setup for this vinyl streamer would be:
>> - Start the Raspi
>> - Liquidsoap is waiting (indefinitely) for the first record to be played
>> - Liquidsoap triggers the shutdown script after the amount of time
>> defined for on_blank recognition.
>> Thanks & best regards
>> Martin
>>
>>
>> Am 04.12.2017 um 12:35 schrieb Nicholas Vrtis:
>>
>> It looks like you are trying to output the source 'phono', but it is the
>> source 'source' that has the 'on_blank'.
>> It might be helpful to see the log to see what it happening, and to put a
>> print in the on blank handler to make sure it is actually being triggered.
>>
>> Nick
>>
>> On Mon, Dec 4, 2017 at 4:36 AM, Federico Allegretti <[email protected]>
>> wrote:
>>
>>> And how do you resolve?
>>>
>>> Il 01/dic/2017 01:15 PM, "Martin Knapp" <[email protected]> ha
>>> scritto:
>>>
>>>> Hi,
>>>> Please apologize if I bring my question (below) up again, It seems that
>>>> I just can't resolve the on_blank issue by myself. I would be very grateful
>>>> for being pointed to some additional information and/or examples (if they
>>>> exist).
>>>> Regards
>>>> Martin
>>>>
>>>> Am 23.11.2017 um 21:19 schrieb Martin Knapp:
>>>>
>>>> Good morning everybody,
>>>> in the Slimdevices forums (LMS, squeezelite etc.) we've been looking
>>>> for a way to shut down a Raspberry Pi automatically after playing some
>>>> music when no sound is detected on the sound card any longer. This can be
>>>> helpful in our cases where we are recording or streaming "vinyl" from
>>>> vintage turntables into a multiroom enabled system like LMS.
>>>> For creating and transmitting the vinyl stream (FLAC), I use Liquidsoap
>>>> and Icecast. That works pretty fine, and I'm very thankful for having
>>>> discovered Liquidsoap.
>>>> My recipe is:
>>>>
>>>> #!/usr/bin/liquidsoap
>>>> # set the path and permissions for the logfile
>>>> set("log.file.path","/var/log/liquidsoap/phono.log")
>>>> set("log.file.perms",777)
>>>> #set("log.unix_timestamps",true)
>>>> #input from soundcard
>>>> phono = input.alsa(bufferize=true,fallible=false,device="hw:0")
>>>> #stream it to local icecast, default port and password
>>>> output.icecast(%ogg(%flac(samplerate=44100,channels=2,compression=5,bits_per_sample=16)),
>>>> mount="/phono", name="Phono", format="audio/ogg", description="Turntable
>>>> FLAC", url="http://192.168.178.200”";
>>>> <http://192.168.178.200”>, genre = "Misc", phono)
>>>>
>>>> Now we have been looking at the on_blank operator described in
>>>> http://liquidsoap.fm/doc-dev/blank.html, which seems to be able to do
>>>> the job of shutting down the Pi after finishing the playback of a vinyl
>>>> record. I created a shut down script (shut_on_blank.sh, owner: root) and
>>>> tried to insert:
>>>>
>>>> def handler()
>>>> system("/etc/liquidsoap/shut_on_blank.sh")
>>>> end
>>>> source = on_blank(handler,phono)
>>>>
>>>> into the .liq file above, but the result was that the entire stream
>>>> generation didn't work any longer.
>>>>
>>>> What am I doing wrong?
>>>>
>>>> The second question that arose was whether the length of the blank to
>>>> be detected as such can be configured with on_blank, too - as it seems to
>>>> be possible with max_blank= for strip_blank. When searching through the
>>>> mailing list, I also found a post saying that the default threshold for
>>>> blank detection is -40db, and that it can be adjusted - but not
>>>> how/where. It seems that we weren't able to find further information on
>>>> this in the docs.
>>>>
>>>> Thanks for your help & best regards
>>>> Martin
>>>>
>>>>
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