[PD-cvs] pd/src iostream.txt,NONE,1.1.2.1

Mathieu Bouchard matju at users.sourceforge.net
Wed Jul 11 00:55:30 CEST 2007


Update of /cvsroot/pure-data/pd/src
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv10157

Added Files:
      Tag: desiredata
	iostream.txt 
Log Message:
separated this from TODO


--- NEW FILE: iostream.txt ---
------------------8<--------cut-here--------8<------------------
Dec 26 2005

1.1. a OutByteStream object is one that accepts those messages on inlet 0:
  * float: seen as a byte (0..255)
  * list of floats: seen as a sequence of float messages.
  * symbol: seen as a \0-terminated string.
  * bang: forces buffer-flushing if there's a buffer.

1.2. a OutByteStream object may also optionally respond to string
     messages, in my dreams. However, in the meanwhile, it may be more
     appropriate to use a new special C function that accepts a pair of
     int and const char * (\0 is not honored: the int specifies the size).
     This is so that there is no speed disincentive to switch to decoupled
     I/O objects.

2.1. an InByteStream object is one that accepts those messages on inlet 0:
  * bang: polls for more input (unlimited size).
  * float: treated as int. polls for at most N bytes.
  * auto 0: requires bang for getting more input.
  * auto 1: uses a t_clock (hidden [metro]) for auto-polling.

2.2. an InByteStream may produce those messages:
  * float: seen as a byte (0..255)
  * list of floats: seen as a sequence of float messages.

and when in "auto 0" mode, it will only send it when receiving a bang or
float.

2.2. an InByteStream object may also optionally produce string
     messages, in my dreams, etc. What would the C function(s) look like
     in this case?

3. an IOByteStream object is just an InByteStream object and an
OutByteStream object at the same time. There is no conflict between the
two.

4. there would be object classes called [tcp] and [udp] which would be
   InputOutputStream objects (supporting in, out and bidi connections).
   They would also respond to "connect" and "disconnect" (or maybe "open"
   and "close" instead) and also "listen" for enabling server mode.

5. there would be an object class called [fudiin] which would be an
OutByteStream and [fudiout] which would be an InByteStream. Thus, to get a
bidirectional [netsend] [netreceive], use this triad:

 |
[fudiout]
 |
[tcp]
 |
[fudiin]
 |

Leaving out the first or the last object gives you [netsend] and
[netreceive] respectively.

6. a [tcp]<->[fudiin] pair can replace the server-side of the GUI
   connection as long as the [tcp] object supports char* input as
   suggested in part 1.2. (if the rest of this proposal is not
   implemented, then use a slightly modified [netreceive] instead)





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