[nas] nas and adobe's libflashsupport

Paul Fox pgf at foxharp.boston.ma.us
Tue Apr 21 16:34:30 MDT 2009

i've implemented the NAS client code for libflashsupport.so,
using some minimal client code i stole from mpg123 as a template. 
it seems to work, mostly (see below).  if i install my
libflashsupport.so in /usr/lib, and run firefox with the a couple
of env variables which force it to choose NAS rather than
something else (the library has a probe and search mechanism that
will usually find native sound before networked sound), then my
audio goes to nasd.

i say "mostly", above, because i've tested locally, and between
several pairs of machines, and there's one nasd server that
reliably dies with "explicit kill or server shutdown", and the
server dies:
    Apr 21 14:53:12 jade kernel:  [262066.900419] nasd[1046]: 
	segfault at 16 ip b7e37a73 sp bfd4caa0 error 4 in

all of my nasd servers are 1.9.1.  i guess i'll have to build
a copy and debug.

if anyone would like to try my libflashsupport.so, please let
me know, and i can send you either a binary, or a patch against


i wrote:
 > just curious -- has anyone considered adding NAS support to the
 > flash plugin that adobe provides?  the intent of their plugin is
 > to allow support of alternate audio output devices and formats,
 > and i have to say, the API is pretty simple -- the client only
 > has to provide open, close, and "latency" routines, and is
 > provided with alloc, free, and "fillbuffer" routines which need
 > to be called as appropriate.  and there are implementation
 > examples for both oss and alsa.  audio samples are 16 bit stereo
 > at 44100.
 > the plugin source from adobe is linked to from here, if you're
 > curious:
 > http://labs.adobe.com/wiki/index.php/Flash_Player:Additional_Interface_Support_f
 > or_Linux
 > i haven't tried to verify that that's the most recent version
 > available from adobe, but i did find this version which adds
 > pulse and esd support:
 >     http://tcosproject.org/cgit/cgit.cgi/libflashsupport.git/
 > in fact, i just realized that this is the source for the
 > debian/ubuntu version, so it's clearly the place to start.
 > having now lived with alsa and pulse for remote audio for about a
 > year, i'm about ready to throw in the towel and switch back to
 > nas, which was far more reliable, far more efficient, and also
 > supports software mixing.  what it lacked, though, was reliable
 > support for audio from my browser, and this could fix that...
 > paul
 > =---------------------
 >  paul fox, pgf at foxharp.boston.ma.us (arlington, ma, where it's 55.8 degrees)

 paul fox, pgf at foxharp.boston.ma.us (arlington, ma, where it's 55.2 degrees)

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