[vlc-devel] asio audio_output module : please help

[frederic.ruget at free.fr]

Hello,

I'm a newbye to this list, I hope I'm not posting off topic.

I want to code a VLC audio_output plugin to drive an
asio sound card.

I plan to use the portaudio/asio API to write the plugin.

My OS is WinXP/cygwin.  So far I have
  - built VLC from source (works OK)
  - built Steinberg's ASIO SDK and portaudio package
    from source (works OK too)

Now the questions :-)


1. Re-compilation time

  Suppose I have modified (say) alsa.c ; what is the quickest way
  to recompile it (alsa.o) and then rebuild vlc.exe ?

  More generally, are there any tips to speed up VLC build?  For
  example, if I change a flag in configure.ac, can I do without
  going through the whole bootstrap && configure && make
  procedure ?  [ takes ages on my machine :-( ]


2. Adding an audio_output module

  Currently I have
    - created an asio.c file in modules/audio_output/

    - updated modules/audio_output/Modules.am : added
<<
SOURCES_asio = asio.c
>>

    - updated configure.ac : added
<<
dnl
dnl  ASIO module
dnl
AC_ARG_ENABLE(asio,
  [  --enable-asio           ASIO sound support (default disabled)],
  [if test "${enable_asio}" = "yes"
   then
     VLC_ADD_PLUGINS([asio])
     VLC_ADD_LDFLAGS([asio],[-llibportaudio])
   fi])
>>

    - bootstrap && configure [...] --enable-asio && make

  Unfortunately, my asio code does not seem to be linked
  within vlc.exe.

  What did I do wrong ?

  By the way, is there some documentation pertaining to the
  vlc configuration stuff (*.ac files) ?


3. Best skeleton for asio.c

  The portaudio API is faily simple (requires a copy of buffers)
  but has a callback function though.  It is described at
  http://www.portaudio.com/docs/pa_tutorial.html.

  Amongst the several audio_output plugins already available
  (alsa.c, coreaudio.c, ...) what would be the best template
  for coding asio.c ?

VLC is great !
Hope I'll soon be able to play DVDs in 4 speaker mode
with my EMU 1820M card ;-)

Regards,

Frédéric

-- 
This is the vlc-devel mailing-list, see http://www.videolan.org/vlc/
To unsubscribe, please read http://developers.videolan.org/lists.html