Yes.. what you have should work. Didn't include the source statement in my
notes, since I was just trying to give the example on how to set/access
variables in functions.
Nick
On Wed, Dec 6, 2017 at 4:36 PM, Martin Knapp <[email protected]> wrote:
> Thanks Nick, but isn‘t the on_noise part lacking in your suggestion, the
> one that is meant to trigger dostartup?
> Could it be integrated this way?
>
> source = on_blank(
> max_blank=60.0,
> on_noise=dostartup,
> handler,
> phono
> )
>
> Regards
> Martin
>
> Am 06.12.2017 um 22:02 schrieb Nicholas Vrtis <[email protected]>:
>
> 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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