On 09/14/2014 02:06 PM, Stefano Verzegnassi wrote: > I recently wrote a small application[1] to spot an ancient issue I had using > QAudioRecorder[2] on Ubuntu devices. > > Specifically, it seems that applications are not able to access to any audio > source available on the device, and for that reason QAudioRecorder::record() > fails. > > First of all, I've asked to some people that own an official supported device > if > they can reproduce the bug, and the answer was affirmative. > > I then started some tests on my Nexus 5 (utopic-devel-proposed #185), on the > i386-ubuntu-emulator (utopic-devel #206) and on my pc (Ubuntu 14.10). > The test application I used is set to run under confinement, and use the > following security policies: networking, audio and microphone. > > In the first test I checked for some denials from apparmor (using 'dmesg | > grep > DEN'), but I found no denial. > > Then I started to take a look to the available audio sources on emulator and > my > N5 and I've seen that only "default:" was available (on PC there are also > 'pulseaudio:' and all the sources from ALSA). > This is the first strange behaviour I found: after I took a look to the > 'microphone' policy, I expected to find at least 'pulseaudio:' on my device. > > After a comparison between the installed packages on my PC and my smartphone, > I > found that gstreamer0.10-pulseaudio was missing. I installed it on the device, > and finally I got 'pulseaudio:' in the list of available sources. > > I tried to start a recording, but QAudioRecorder still failed. > I got this output on my console: "shm_open() failed: Permission denied" > > I changed the apparmor profile[3], so that my app has been launched in a > unconfined environment: I supposed that the shared memory was confined for > security issue. > > So finally I got QAudioRecorder working as expected. > > It seems there are actually two issues: > 1) gstreamer0.10-pulseaudio is not available on Ubuntu devices. I don't know > the > reasons for that, but it would seem to give problems to QAudioRecorder. > 2) 'microphone' security policy is too strong, and does not allow > QAudioRecorder > to work properly. >
I'm not sure about the gstreamer0.10-pulseaudio portion, however you can file a bug about the microphone policy not working here: https://bugs.launchpad.net/ubuntu/+source/apparmor-easyprof-ubuntu/+filebug -- Jamie Strandboge http://www.ubuntu.com/
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