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Dmitriy Vinokurov
Asked: 2017-01-30 21:19:07 +0800 CST

echo-cancel does not work after PulseAudio rebuild

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I work with Ubuntu 14.04.5 and faced troubles with rebuilding PulseAudio from source. PulseAudio here is 4.0-0ubuntu11.1, but I need to rebuild it and include recent patch https://patchwork.freedesktop.org/patch/65100/ which improves echo-cancel module.

I tried to rebuild PA following instructions from Ubuntu community docs https://help.ubuntu.com/community/UpdatingADeb . I.e. apt-get build-dep ..., apt-get source ..., patch ..., debchange -i, dpkg-source --commit, debuild -us -uc -i -I. Built was successful, only one error - "pulseaudio: postrm-does-not-call-updaterc.d-for-init.d-script etc/init.d/pulseaudio", but I think it should be ignored. Then I installed built packages using debi, tried to launch PA and get following error:

$ pulseaudio -vvv
<...>
D: [pulseaudio] module-systemd-login.c: Added new session c2
I: [pulseaudio] module.c: Loaded "module-systemd-login" (index: #14; argument: "").
I: [pulseaudio] module.c: Loaded "module-position-event-sounds" (index: #15; argument: "").
I: [pulseaudio] module.c: Loaded "module-filter-heuristics" (index: #16; argument: "").
I: [pulseaudio] module.c: Loaded "module-filter-apply" (index: #17; argument: "").
Inconsistency detected by ld.so: dl-open.c: 689: _dl_open: Assertion `_dl_debug_initialize (0, args.nsid)->r_state == RT_CONSISTENT' failed!

The moment when launch fails is exact the moment when echo-cancel module should start. Furthermore, even if I rebuild PA without any significant changes - I get same error. If I use PA from officical Ubuntu repo - it starts without any error and launchs echo-cancel module successfully.

This is how I enable echo-cancel, these lines I added to the end of /etc/pulse/default.pa:

load-module module-echo-cancel source_name=noechosource sink_name=noechosink
set-default-source noechosource
set-default-sink noechosink

Could anybody suggest how can I solve this problem with rebuilding PA? Maybe the way I rebuild package is wrong in some point. As I said, the problem is not even with rebuilding modified PA, but with simple rebuilding it without any changes, so seems that the problem is with build process itself.

pulseaudio

1 Answers

  1. Figured it out, at least in the main:

    It is a specific deb building problem, not related to PulseAudio itself:

    • The RT_CONSISTENT assertion failure was caused by the missing dependency of module-echo-cancel.so:
      ldd on this module shows libwebrtc-util.so => not found and according to debuild log this file was built, but not packaged to deb and so was not installed to the system
    • The default trusty PA package is built without support of WebRTC AEC (and that's why you don't need and don't install libwebrtc-util.so).
    • But I need exactly this kind of AEC and that's why I've installed the libwebrtc-audio-processing-dev package before rebuilding the PA. These WebRTC libs were caught by the PA configure script and the PA was built with WebRTC support, but during post-built steps not all required files were packaged to deb.
    • Now as a temporary measure I manually moved libwebrtc-util.so to its desired location. Later I'll find out how to fix building scripts to handle this case correctly and come back and update this answer.
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