Where does this looper code comes from?
Thanks.
Stéphane
> Le 22 déc. 2020 à 14:29, Daniele Pagliero <daniele.pagli...@gmail.com> a
> écrit :
>
> Hello Stéphane,
>
> thanks a lot, This solve the compile error.
>
> I take the advantage of your kindness to ask more about the language
> functionality that to me is still cryptic.
>
> here is the previous code with the int cast fix:
>
> import("stdfaust.lib");
>
> sampleRate = 48000;
> maxTime = 4;
> maxSamples = sampleRate * maxTime;
>
> btn = button("[4]trigger");
> readSpeed = hslider("[3]read_speed", 1, -3, 3, 0.1) : si.smoo;
>
> loopSize = ba.sAndH(btn, fi.pole(btn, btn)) : int :
> hbargraph("[0]loop_size", 0, maxSamples);
> readIndex = readSpeed/float(sampleRate) : (+ : ma.decimal) ~ _ :
> *(float(loopSize)) : int : hbargraph("[1]read_index", 0, maxSamples);
> recIndex = (+(1) : %(maxSamples)) ~ *(btn) : int :
> hbargraph("[2]rec_index", 0, maxSamples);
>
> looper = rwtable(maxSamples,0.0,recIndex,_,readIndex);
>
> process = looper, looper;
>
> I need help to understand the recursion operator and why it doesn't work as I
> expect.
>
> this statement is clear:
>
> recIndex = (+(1) : %(maxSamples)) ~ *(btn)
>
> and I can translate it in something like:
>
> recIndex = ((recIndex + 1) % maxSamples) * btn
>
> Now I have problem understanding this one:
>
> readIndex = readSpeed/float(sampleRate) : (+ : ma.decimal) ~ _ :
> *(float(loopSize)) : int
>
> This doesn't fit my needs as I want the speed constant independently on the
> loopSize so I tried to change it in this way:
>
> readIndex = (+(1) : %(loopSize)) ~ _ : int
>
> that for me seems the same syntax of:
>
> readIndex = (readIndex + 1) % loopSize
>
> But it doesn't work. Can you please help me?
>
> Thank you,
> Daniele
>
>
> On 22/12/20 12:34, Stéphane Letz wrote:
>> OK,
>>
>> : rwtable(n,s,w,_,r) : _
>>
>> Where:
>>
>> • n: the table size
>> • s: the initial table content
>> • w: the write index (an int between 0 and n-1)
>> • r: the read index (an int between 0 and n-1)
>>
>>
>> So « w » and « r » must be of type « int » , correction here :
>>
>> recIndex = (+(1) : %(maxSamples)) ~ *(btn) : hbargraph("[2]rec_index", 0,
>> maxSamples) : int;
>>
>> This does compile (but I’ve not tested final result)
>>
>> Stéphane
>>
>>> Le 22 déc. 2020 à 11:52, Daniele Pagliero <daniele.pagli...@gmail.com> a
>>> écrit :
>>>
>>> Hello Stéphane,
>>>
>>> actually I'm playing with the online Faust IDE.
>>>
>>> Daniele
>>>
>>> Il giorno mar 22 dic 2020 alle ore 11:40 Stéphane Letz <l...@grame.fr> ha
>>> scritto:
>>> Hi Daniele,
>>>
>>> I don’t see this error when compiling here with master-dev 2.30.3 version.
>>>
>>> Which Faust version are you using ?
>>>
>>> Thanks.
>>>
>>> Stéphane
>>>
>>>> Le 22 déc. 2020 à 01:34, daniele.pagli...@gmail.com a écrit :
>>>>
>>>> Hi Dario,
>>>>
>>>> thanks a lot! It is exactly what I needed.
>>>> To go further with the looper, here is the code so far:
>>>>
>>>> import("stdfaust.lib");
>>>>
>>>> sampleRate = 48000;
>>>> maxTime = 4;
>>>> maxSamples = sampleRate * maxTime;
>>>>
>>>> btn = button("[4]trigger");
>>>> readSpeed = hslider("[3]read_speed", 1, -3, 3, 0.1) : si.smoo;
>>>>
>>>> loopSize = ba.sAndH(btn, fi.pole(btn, btn)) : hbargraph("[0]loop_size", 0,
>>>> maxSamples);
>>>> readIndex = readSpeed/float(sampleRate) : (+ : ma.decimal) ~ _ :
>>>> *(float(loopSize)) : int : hbargraph("[1]read_index", 0, maxSamples);
>>>> recIndex = (+(1) : %(maxSamples)) ~ *(btn) : hbargraph("[2]rec_index", 0,
>>>> maxSamples);
>>>> // doesn't compile
>>>> // looper = rwtable(maxSamples,0.0,recIndex,_,readIndex);
>>>> // compiles
>>>> looper = rwtable(maxSamples,0.0,0,_,readIndex);
>>>>
>>>> process = looper;
>>>> the read and write indexes are from the example I found on the
>>>> documentation:
>>>> https://faustdoc.grame.fr/manual/syntax/#rwtable-primitive
>>>>
>>>> I get this error for the recIndex and I can't understand its meaning:
>>>> ERROR inferring write table type, wrong write index type : RSESN interval()
>>>>
>>>> Can you please point me anywhere I can figuring out what does it mean?
>>>>
>>>> Sorry, my knowledge of the platform is quite small and also functional
>>>> programming syntax is not always clear to me...
>>>>
>>>> Thanks,
>>>> Daniele
>>>>
>>>>
>>>> Il 21/12/20 15:34, Dario Sanfilippo ha scritto:
>>>>> Hi, Daniele.
>>>>>
>>>>> Perhaps something like this?
>>>>>
>>>>> import("stdfaust.lib");
>>>>> btn = button("trigger");
>>>>> down_samples = ba.sAndH(btn, fi.pole(btn, btn));
>>>>> process = down_samples;
>>>>>
>>>>> Ciao,
>>>>> Dario
>>>>>
>>>>> On Mon, 21 Dec 2020 at 14:56, Daniele Pagliero
>>>>> <daniele.pagli...@gmail.com> wrote:
>>>>> Hello,
>>>>>
>>>>> I need help understanding how to get the elapsed time or samples between
>>>>> 2 clicks on a button.
>>>>>
>>>>> Let's say I have a button like:
>>>>>
>>>>> btn = button("trigger");
>>>>>
>>>>> I need to know for how long the button was pressed.
>>>>> Then use the value to control a rwtable to create a variable length
>>>>> looper.
>>>>>
>>>>> I've searched in the docs but I didn't find any clue...
>>>>>
>>>>> Thanks,
>>>>> Daniele
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> Faudiostream-users mailing list
>>>>> Faudiostream-users@lists.sourceforge.net
>>>>> https://lists.sourceforge.net/lists/listinfo/faudiostream-users
>>>>>
>>>>>
>>>>> --
>>>>> Dr Dario Sanfilippo
>>>>> http://dariosanfilippo.com
>>>> _______________________________________________
>>>> Faudiostream-users mailing list
>>>> Faudiostream-users@lists.sourceforge.net
>>>> https://lists.sourceforge.net/lists/listinfo/faudiostream-users
>>>
>>>
>>> --
>>> Daniele Pagliero
>>> Via Rosta, 5
>>> 10143 TORINO - ITALY
>>> mobile: (39)339-1154922
>>> ---
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