with this patch you can have multichannel output over hdmi, it is based on ffmpeg to decode the multichannel sound and send it as pcm. Also Apollo can bitstream the sound file (dts/ac3 wav files, maybe flac too as multichannel pcm).
on my AVR the center is swapped with LFE, please test and let me know if is working for you.
the sourcecode is on cyanogenmod gerrit but until now is no merged so I compiled the files, this patch also contains ffmpeg 2.2.2 vs 2.1.4
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