Saturday, July 5, 2008

Hello MikMod!

As promised earlier, I've packaged an obligatory example of how to use the iPhone port of libmikmod which I've talked about recently. Go grab this tarball which implements a very simple "Hello World!":
  • It shows how to play a module within a UIKit application. This is an adaptation of the skeleton program found in MikMod Documentation.
  • It shows how to use the higher level sound API Celestial to control mikmod output. For instance, how to react to volume change events when iPhone buttons are pressed.
What to do with this archive once you've extracted it?
  tar -zxf HelloMikMod.tar.gz
  cd HelloMikMod
Simple! Modify the Makefile to set the location of the AudioQueue.h header, as well as the location where you've installed libmikmod. Once you're done, the makefile should look like:
  # directory where AudioQueue.h is located
  AQDIR=$(HOME)/local/audioqueue
  # directory where MikMod is located
  MMDIR=$(HOME)/local/mikmod-iphone
  # comment the following line when the previous settings are OK for you
  #$(error configure AudioQueue and Mikmod location in the Makefile first)
Then, just build and install the app by typing:
  make
  scp -r HelloMikMod.app root@iphone:/Applications
Where iphone stands for the hostname or the IP of your iPhone. Note that you will need either curl or wget installed or your machine so that the build process is able to download the module played in this example app (fortunately, one of those should always be available on MacOS X or on your favorite Linux distro). For your convenience, the HelloMikMod.app directory is standalone: it contains the app itself linked statically to libmikmod, a launcher descriptor for Springboard and the module to play. For my own pleasure, the mod played is Stardust Memories by Jester / Sanity, my all time favorite Amiga mod (see the compo World of Commodore). This is only a simple example of how to use MikMod on iPhone. I've started implementing a more complex app that mimics the iPod interface for playing mods (Module DB, Screenshot of associated demos...). Now if only I could use Nectarine or Pouet.net DB to make some kind of systematic indexing available!! (sigh....)
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