The liba52 "codec" is now an audio filter. It means we are now able to
autodetect S/PDIF hardware support and the audio output plug-in chooses the best one. Of course it probably breaks existing output modules, see oss.c for hints :). Also include minor tweaks which will entitle us to decode and output 5.1 audio. It may break existing plug-ins, too. See audio_output.c:aout_FormatNbChannels for hints.
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