[PD] writing dsp externals for variable number of inlets
Hello, I want to write an external which creates the signal inlets dynamically depending on the number of arguments, just like the multiplex~ object from zexy. My question is about writing the dsp_add function. How do I set the arguments when I don't exactly know how many signals I will be handling? I hope my question is appropriate for the list (first post)? Thanks. -- ahmet kizilay http://www.ahmetkizilay.com ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] writing dsp externals for variable number of inlets
Hi, Ahmet I don't know how to create a variable argument type of function definition for this purpose, but it should be clear that your dsp function knows how many inlets there will be. You will be setting the number of inlets when the object is created. You could make a maximum number of inlets and add a data structure element to store the number of inlets. Then, in your dsp function, put a case statement to look up the dsp_add call with the correct number of arguments. I'm not sure that's the best way, since dsp_add has a variable number of arguments in its definition. It would make sense to me if function calls had to have a fixed number of arguments, but I'm just not sure. Chuck On Sat, May 7, 2011 at 10:01 AM, Ahmet Kizilay ahmet.kizi...@gmail.comwrote: Hello, I want to write an external which creates the signal inlets dynamically depending on the number of arguments, just like the multiplex~ object from zexy. My question is about writing the dsp_add function. How do I set the arguments when I don't exactly know how many signals I will be handling? I hope my question is appropriate for the list (first post)? Thanks. -- ahmet kizilay http://www.ahmetkizilay.com ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] writing dsp externals for variable number of inlets
Hi, Thanks for your reply. I looked through the source code and found out about the dsp_addv method, which was created specifically for this purpose. Best, On Sat, May 7, 2011 at 7:43 PM, Charles Henry czhe...@gmail.com wrote: Hi, Ahmet I don't know how to create a variable argument type of function definition for this purpose, but it should be clear that your dsp function knows how many inlets there will be. You will be setting the number of inlets when the object is created. You could make a maximum number of inlets and add a data structure element to store the number of inlets. Then, in your dsp function, put a case statement to look up the dsp_add call with the correct number of arguments. I'm not sure that's the best way, since dsp_add has a variable number of arguments in its definition. It would make sense to me if function calls had to have a fixed number of arguments, but I'm just not sure. Chuck On Sat, May 7, 2011 at 10:01 AM, Ahmet Kizilay ahmet.kizi...@gmail.comwrote: Hello, I want to write an external which creates the signal inlets dynamically depending on the number of arguments, just like the multiplex~ object from zexy. My question is about writing the dsp_add function. How do I set the arguments when I don't exactly know how many signals I will be handling? I hope my question is appropriate for the list (first post)? Thanks. -- ahmet kizilay http://www.ahmetkizilay.com ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list -- ahmet kizilay http://www.ahmetkizilay.com ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
Re: [PD] writing dsp externals for variable number of inlets
On Sat, 7 May 2011, Ahmet Kizilay wrote: Hello, I want to write an external which creates the signal inlets dynamically depending on the number of arguments, just like the multiplex~ object from zexy. My question is about writing the dsp_add function. How do I set the arguments when I don't exactly know how many signals I will be handling? For passing a variable number of args to dsp_add itself, use dsp_addv instead. In any case, one of the fixed arguments has to be saying how many arguments there will be, or one of the variable arguments has to be telling it, or one of the arguments has to point to a struct that says it. It's similar to how functions that depend on stdarg.h provide variable length lists of arguments. class_addmethod says end of arguments by passing A_NULL. printf's format strings have %-codes that tell you how many extra args there are. some functions in pd want format strings like ffsfsffp; to say two floats, one symbol, one float, etc., to announce the upcoming arguments in a function call. some other functions pass just an integer that says n arguments are upcoming, such as dsp_add itself. (you know what I mean ?) ___ | Mathieu Bouchard tél: +1.514.383.3801 Villeray, Montréal, QC ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management - http://lists.puredata.info/listinfo/pd-list
