Output stream is only directed to DLNA device with a pre-existent stream. about pulseaudio-dlna

[Takkat-Nebuk]

Defining a dummy stream before we start pulseaudio_dlna.py indeed leads to the expected results. We can now switch to the DLNA sink without the need of starting our output first.

This can be done e.g. by running from a script:

#! /bin/bash

PASTREAMS=$(pacmd list-sink-inputs)
if [[ $PASTREAMS == *"0 sink input(s)"* ]]; # only if there were no streams
then
    echo "Creating dummy stream"
    pacat /dev/zero &
fi
python pulseaudio_dlna.py

Killing pacat after a DLNA-sink was selected will still let us start another stream on that sink.

We could put this somewhere in the code of pulseaudio_dlna.py to

1. establish a dummy stream on selecting a DLNA-sink before we actually switch to this sink.
2. this only should be done if there was no other stream.
3. the dummy stream can be terminated as soon as it was sent to parec for the DLNA sink.

I suspect the appropriate place would be in pulseaudio.py PulseWatcher but I am not so familiar with the code, or any other place it could sit. In case we do not worry about a dummy stream sitting in the background it could also be added to pulseaudio_dlna.py

[masmu]

Thank you very much for your detailed report and your efforts. 😄

I am currently pretty busy, but i think i tracked it down.

Could you please test this? bug/on-stream-changes

[Takkat-Nebuk]

Wow, that's just brilliant!

Much better than creating a stupid dummy stream. Everything seems to work as expected now.

Thank you!!!

[masmu]

Merged.

PulseAudio just informs you that a device (sink, stream) changed, but not what changed. So, its kind of tricky and therefore up to you to find out what actually changed. When i implemented the PulseWatcher i pretty was sure that on_new_playback_stream and on_playback_stream_removed would get pretty handy sometime 😄.

Thanks for being so tenacious.

And I don't think your solution was stupid at all, it was a good lead to what was really going on.

• 0.2.4 - (2015-01-25)
  • Stream changes are now handled correctly (thanks to Takkat-Nebuk)