Phonon Audio unused

[wolkstein]

hi, i noticed that under linux no audio is available. after a short look into sources file GAudioOutput.cc i noticed that Phonon calls are commented. i enabled phonon in code and noticed that it will work but crash on closing application. searching for this issue ended without any concrete results. more or less a phonon bug is often discussed in web. so i diside to write a simple alsa audio driver for linux. i finished my simple implementation for an alsa and libsndfile depended driver. goals:

• using alsa audio directly
• using libsndfile to load samples from disk
• queued sound calls. that means switching between modes or other messages do not interrupt running messages as before using phonon.
• storing wav files into an tmp_audio directory inside ~/apmplanner2/tmp_audio. if a wav file not exist it will created named with the spoken text message. if a file already exist flite synthesiser creation step is bypassed and the existing file will queued for audio-process. this save cpu and make queueing of audiofiles possible.

i create no pull request because the changes are a little bit bigger. also it depends on libasound2-dev and libsndfile-dev. but if you are interested you can clone and test my repo . my changes are in master branch:( i simple forgot to branch before i start writing. i fetch diydrones / apm_planner upstream and merge it to my master. so it is always on head. my fork https://github.com/wolkstein/apm_planner

/g wolke

[stephendade]

I'll take a look at it over the weekend...