livelooper1.c
  

I've uploaded a .c file, I'm aiming to playback an audio file and I'm trying
to adjust the amp of the playback by entering text into a while loop that
"waits" for user input. 

The file ive attached doesnt yet achieve this. I was hoping someone wouldn't
mind taking a look and filling any gaps in my knowledge that i haven't yet
applied to have this work as intended :)

many thanks,

J



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Does not the amp channel expect a number, float or double depending on your csound- build but you send a character?

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On Apr 14, 2020, 12:59, at 12:59, fauveboy  wrote:
>livelooper1.c
>  
>
>I've uploaded a .c file, I'm aiming to playback an audio file and I'm
>trying
>to adjust the amp of the playback by entering text into a while loop
>that
>"waits" for user input. 
>
>The file ive attached doesnt yet achieve this. I was hoping someone
>wouldn't
>mind taking a look and filling any gaps in my knowledge that i haven't
>yet
>applied to have this work as intended :)
>
>many thanks,
>
>J
>
>
>
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I believe it needs a float. In that case I could use atof() function to
convert char to float. However if amp_channel= 1; (like in my file
attachment here, no sound is yet audible livelooper1.txt
   ...?



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>No real ideas.  What is in your audio.wav file?  \

On Tue, 14 Apr 2020, fauveboy wrote:

> I believe it needs a float. In that case I could use atof() function to
> convert char to float. However if amp_channel= 1; (like in my file
> attachment here, no sound is yet audible livelooper1.txt
>    ...?
>
>
>
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Removing the PI and running as a straight csd I get

INIT ERROR in instr 1 (opcode tablekt.a) line 26: tablekt: index type 
inconsistent with output
  from file live.csd (1)
asig    tablekt.a       kindex  1       0       0       1
           B  0.000 - note deleted.  i1 had 1 init errors


Line 26 is

asig tablekt kindex, 1, 0, 0, 1

Over to you....

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livelooper1.c
  

Heres the latest program with the corrections to the tableikt name and args. 
This will playback to audio as expected.

The new issue I need help with, is to learn an appropriate method to get
data from the user while the file is playing back?

If you look at the file I have a while loop on line 65. I have commented out
the scanf() function. This is because the while loop pauses at scanf which
in turn stops to flow of audio. How can this be done without stopping the
audio output?



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Not at a computer yet but scanf will block until it gets a new line or such.  So either put the scanf in a separate thread or use select ( I think that is the name) to check to see if there is input waiting.  Really a C issue rather than csound.

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On Apr 15, 2020, 11:54, at 11:54, fauveboy  wrote:
>livelooper1.c
>  
>
>Heres the latest program with the corrections to the tableikt name and
>args. 
>This will playback to audio as expected.
>
>The new issue I need help with, is to learn an appropriate method to
>get
>data from the user while the file is playing back?
>
>If you look at the file I have a while loop on line 65. I have
>commented out
>the scanf() function. This is because the while loop pauses at scanf
>which
>in turn stops to flow of audio. How can this be done without stopping
>the
>audio output?
>
>
>
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It looks like the csound thread options are a good potential solution?

This is the only example I've that begins to implement this:
https://github.com/csound/csoundAPI_examples/blob/master/c/example4.c

livelooper1.c
   I've
added the csoundCreateThreat() function to my program however, its not yet
clear to me what can be done next with this? A separate while loop with
scanf() inside maybe?...




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Ill using c++ instead. Im folloing the examples here:
https://github.com/csound/csoundAPI_examples/blob/master/cpp/csPerfThreadExample.cpp.
Heres the latest update to my file  livelooper1.cpp
  . This
is the output http://ix.io/2iak. 

There isnt a discription as to where csPerThread.hpp is.

I have taken a look at your examples @rorywalsh so thanks for those. I think
just need to go over a simpler example before hand




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actually heres an issue on a more basic step than my previous post here:

Heres my first attempt to use c++ with csoundapi  csoundapicplusplus.cpp
  

However heres the issue: http://ix.io/2ian



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i was using these paths for my program when it was just c code: g++
-Iusr/local/include/csound -L/usr/local/lib> -lcsound64 livelooper.c. is
there anything wrong with this command which could be a solution?



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just a type I didn't use the ">" in the command



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Using the command that compiled for you I only get an error stating the
following: http://ix.io/2iak

I was wondering if csPerfThread.hpp i just a file I need to download from
somewhere and have in the same directory? 

there doesn't appear to be anything in usr/local/lib for me actually, is
that an issue? :S.....


separate idea. As an alternative to using the csoundapi. perhaps changing
values via OSC  in a simple c program could work instead? 



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How about using a thread in the C program that does the read/scanf and sets a flag when it reads a value that the perf loop can sense and write to the channel?  That does not need anything fancy for interlocks or C++ or difficult stuff.

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On Apr 16, 2020, 11:15, at 11:15, fauveboy  wrote:
>Using the command that compiled for you I only get an error stating the
>following: http://ix.io/2iak
>
>I was wondering if csPerfThread.hpp i just a file I need to download
>from
>somewhere and have in the same directory? 
>
>there doesn't appear to be anything in usr/local/lib for me actually,
>is
>that an issue? :S.....
>
>
>separate idea. As an alternative to using the csoundapi. perhaps
>changing
>values via OSC  in a simple c program could work instead? 
>
>
>
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Thats sounds like a good idea @jpff. Im still learning what that c program
would look like to be able to do that, are you able to share an example?



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I'm currently investigating this error @Michael Gogins-2 output3.txt
   after
running. g++ csound_threaded.cpp -I /usr.local/include/csound -L
/usr/local/lib -lcsound64 -o test



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oops, sorry it has compiled with this line, which is in the comments: g++
--std=c++11 -Wno-write-strings -O2 -g csound_threaded.cpp -o csound_threaded
-lcsound64 -lpthread -lm



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Okay, so the csound_threaded.cpp runs successfully ( plays out some nice
sounds btw). 

How does this support the goal of interacting krate values in the orc here 
via a scanf() in a while loop ( for example).

On line 256 its says: int thread = csound.Perform()

Shall i simple do a line before or after looking something like: int thread2
= ????

Hope I've got accross my problem there :) 



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I think a working example would help a lot, when you get a moment, thanks.  
csound_threaded.cpp
  
I've tried to implement what you've suggested in my latest version of
csound_threaded.cpp.  

Does this start a thread where csound can sends samples to the output. And
the while loop is now in a separate thread? So it doesnt stop csound from
play audio when getline() is waiting for user input?

orc syntax seems like quite alot to type in while its playing? I think im
wrong there. But for its not clear to me yet what the user enters? 







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Thats great, thanks. I've had to simplify it quite a bit more heres my latest
version of csound_threaded csound_threaded.cpp
  

Im testing it with a one instr that contains simple oscil.

Im entering schedule(5,500,1)

but I get no sound and the program reads Result: 0

can you see whats not working here compared to your previous instruments?



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Okay, thanks ;)... 

Couple more thoughts here.

schedule(....) is quite a lot to type in. Is there a way to vary this ?
Im think that Ill have the .cpp file add schedule so the user only needs to
type the p-fields. 

But, I was wondering if there is are other types of csound code that the
csound api can recieve?

Say if I just want to vary a single k-rate parameter? For example if I added
kamp to the asig output?

could the cpp. file say read in the data check if the user has written lets
say "kamp 0.5" and then adjust the instr accordingly as its playing?

What are your thoughts?

------------

Also, how can I stop a schedule task while its playing without closing the
program?



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Some helpful food for thought there, thank you. 

Its still not clear with that info how I can cancel a note event or change
the value of a particular variable?

csound_threaded.cpp
  

from my latest version of csound_threaded you can see im now using
csound.ReadScore().

I you enter: i1 0 100. 

After reading ttp://www.csounds.com/manual/html/i.html, its suggests I can
stop that not a event with a negative p1? 
I take that to mean: i -1 0 100 would stop the note event? but the compiler
says "could not find playing instr 1.000. Do you know what that hasnt
worked?

My aim is to loop an audio clip.  While its playing how can I specify a
particular variable via the csoundapi while the note event is performing ?
for example the kfn in tableitk, or kamp. Can you specifically show me?
Sorry Im not getting yet.

Kind Regards



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