here's a first work-in-progress set of patches. I managed to route iec958 formatted data through PulseAudio, works fine but there's still a lot to do.
As discussed on the mailing list, I added a new flag to pa_stream connections, and also added a flag for the sink in case it can handle passthrough data. There's some logic to prevent silly connections but still allow for the same use cases as before: you can still mix and play PCM streams on a passthrough output, however you cannot connect nonaudio data to a regular sink, and likewise if a sink has already a connection you can only connect if both the existing inputs and the new one are PCM. Volume control is disabled only when a nonaudio stream is connected. You can give it a try by setting the 'Passthrough' configuration in pavucontrol and the following command line gst-launch filesrc location=<file.ac3> ! ac3iec958 raw-audio=true ! pulsesink (note that pulsesink needs to be extended to handle the x-iec958 caps and set the NONAUDIO_IEC958 flag when needed, the mixing logic will not work with pulsesink). I still have to do some work on sample-rate and channel map adaptation, but comments are welcome at this point. Cheers - Pierre
0001-alsa-fix-mixer-profiles-add-passthrough-config.patch
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0002-AC3-passthrough-support.patch
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