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r10r opened this issue May 1, 2013 · 6 comments
Closed

failed to register callback for PulseAudio signal #44

r10r opened this issue May 1, 2013 · 6 comments

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@r10r
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r10r commented May 1, 2013

Hi,

I'm trying to register a callback for a pulseaudio source device on the pulseaudio bus.
see https://gist.github.com/r10r/5496667

I get the following error:

DBus::Error: Method "AddMatch" with signature "s" on interface "org.freedesktop.DBus" doesn't exist

    from /var/lib/soundmaster/.gem/ruby/2.0.0/gems/ruby-dbus-0.9.1/lib/dbus/bus.rb:407:in `block in send_sync_or_async'
    from /var/lib/soundmaster/.gem/ruby/2.0.0/gems/ruby-dbus-0.9.1/lib/dbus/bus.rb:633:in `call'
    from /var/lib/soundmaster/.gem/ruby/2.0.0/gems/ruby-dbus-0.9.1/lib/dbus/bus.rb:633:in `process'
    from /var/lib/soundmaster/.gem/ruby/2.0.0/gems/ruby-dbus-0.9.1/lib/dbus/bus.rb:580:in `send_sync'
    from /var/lib/soundmaster/.gem/ruby/2.0.0/gems/ruby-dbus-0.9.1/lib/dbus/bus.rb:405:in `send_sync_or_async'
    from /var/lib/soundmaster/.gem/ruby/2.0.0/gems/ruby-dbus-0.9.1/lib/dbus/introspect.rb:274:in `block (2 levels) in define_method_from_descriptor'
    from /var/lib/soundmaster/.gem/ruby/2.0.0/gems/ruby-dbus-0.9.1/lib/dbus/bus.rb:607:in `add_match'
    from /var/lib/soundmaster/.gem/ruby/2.0.0/gems/ruby-dbus-0.9.1/lib/dbus/introspect.rb:325:in `on_signal'
    from /var/lib/soundmaster/.gem/ruby/2.0.0/gems/ruby-dbus-0.9.1/lib/dbus/introspect.rb:455:in `on_signal'
    from (irb):145
    from /usr/bin/irb:12:in `'

Any idea what is going wrong here?

[soundmaster@blaubeere ~]$ dbus-daemon --version
D-Bus Message Bus Daemon 1.6.8
Copyright (C) 2002, 2003 Red Hat, Inc., CodeFactory AB, and others
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
@mvidner
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mvidner commented May 2, 2013

Oh, I did not know that Pulseaudio runs a separate bus for itself. That will be fun to debug :)

@r10r
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r10r commented May 2, 2013

Hmm, yeah. It took me a while to figure that out as well - but it is mentioned at the beginning of the pulse documentation. :) I have a working python example now - see https://gist.github.com/r10r/5501136 - but I definitely prefer the ruby version ;)
I've also updated the gist https://gist.github.com/r10r/5496667 - unfortunately the problem still persists ...

mvidner added a commit that referenced this issue May 2, 2013
@mvidner
Make on_signal work without a bus (#44).
76c9ade 
PulseAudio uses a connection outside the well known buses:
http://www.freedesktop.org/wiki/Software/PulseAudio/Documentation/Developer/Clients/DBus

This is a dirty hack and should be cleaned up by separating
BusConnection from Connection.
@mvidner
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mvidner commented May 2, 2013

I have pushed out a quick fix in the peer-connection branch. A proper fix will follow.

BTW I didn't know how to trigger a StateUpdated signal but fortunately VolumeUpdated is there as well.

@r10r
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r10r commented May 2, 2013

hey cool, i'll try it out later the evening and will give you feedback. StateUpdated can be triggered by toggling pause/playback on the source. E g. I've connected my phone via bluez and toggle play/pause the media player (spotify)

@r10r
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r10r commented May 2, 2013

Works fine now :D - Thanks a lot. Can you give me a short hint why it is not required to call AddMatch on the connection?

@mvidner mvidner changed the title failed to register callback for signal failed to register callback for PulseAudio signal May 24, 2015
stefano-m added a commit to stefano-m/lua-ldbus_api that referenced this issue Aug 14, 2016
@stefano-m
Add match only to session or system buses
24050c4 
DBus connections that are not session nor system buses do not implement
`AddMatch`. So, trying to add a match in `ldbus.api.watch` results in
the following error being returned by DBus:

`Method "AddMatch" with signature "s" on interface
"org.freedesktop.DBus" doesn't exist`

To fix the issue, simply skip the step to add a match.

Manually verified to work with PulseAudio. Adding tests for this seems
too painful compared with the benefit received.

References:

* mvidner/ruby-dbus#44
@lrusak lrusak mentioned this issue Mar 14, 2021
Closed
mvidner added a commit that referenced this issue Jun 13, 2023
@mvidner
PeerConnection: fix listening for signals (#44), with test and example
3849061 
the fix is dirty, will move code to PeerConnection
mvidner added a commit that referenced this issue Jun 13, 2023
@mvidner
Move relevant methods from Connection to BusConnection
6abdc8a 
These are:
- unique_name
- proxy
- service
- []
- send_hello

Split these up for a better fix of #44, signals on peer connections:
- add_match
- remove_match
@mvidner mvidner mentioned this issue Jun 13, 2023
Merged
@mvidner
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mvidner commented Jun 13, 2023

Fixed now

@mvidner mvidner closed this as completed Jun 13, 2023
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@mvidner @r10r