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”";,
>>>>>>>> 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
>>>>>>>
>>>>>>> ------------------------------------------------------------------------------
>>>>>>> Check out the vibrant tech community on one of the world's most
>>>>>>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
>>>>>>> _______________________________________________
>>>>>>> Savonet-users mailing list
>>>>>>> [email protected]
>>>>>>> https://lists.sourceforge.net/lists/listinfo/savonet-users
>>>>>>>
>>>>>>
>>>>>> ------------------------------------------------------------------------------
>>>>>> Check out the vibrant tech community on one of the world's most
>>>>>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
>>>>>> _______________________________________________
>>>>>> Savonet-users mailing list
>>>>>> [email protected]
>>>>>> https://lists.sourceforge.net/lists/listinfo/savonet-users
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>> ------------------------------------------------------------------------------
>>>>> Check out the vibrant tech community on one of the world's most
>>>>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> Savonet-users mailing list
>>>>> [email protected]
>>>>> https://lists.sourceforge.net/lists/listinfo/savonet-users
>>>>
>>>>
>>>> ------------------------------------------------------------------------------
>>>> Check out the vibrant tech community on one of the world's most
>>>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
>>>> _______________________________________________
>>>> Savonet-users mailing list
>>>> [email protected]
>>>> https://lists.sourceforge.net/lists/listinfo/savonet-users
>>>>
>>>
>>
>> ------------------------------------------------------------------------------
>> Check out the vibrant tech community on one of the world's most
>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
>> _______________________________________________
>> Savonet-users mailing list
>> [email protected]
>> https://lists.sourceforge.net/lists/listinfo/savonet-users
>>
>
> ------------------------------------------------------------------------------
> Check out the vibrant tech community on one of the world's most
> engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> _______________________________________________
> Savonet-users mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/savonet-users
------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
Savonet-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/savonet-users
