QAudioRecorder recording hangs

[Michał Karnicki]

Recording audio with QAudioRecorder intermittently fails for me. Another user even reported that it only works 1 out of 5-10 times.

QAudioRecorder seems to hang on requesting the audio to be recorded (status QMediaRecortder::StartingStatus). When it actually works, it properly goes from starting to recording and then it's possible to record audio and playback.

QAudioRecorder has an error() method, but it returns QMediaRecorder::NoError

Since it was confirmed by two people (victorp, karni) we suspect it's a bug in the middleware rather than the apps.

A test click has been sent to Ricardo's e-mail by Victor.

phablet@ubuntu-phablet:~$ system-image-cli -i
current build number: 20
device name: krillin
channel: (the BQ channel)
last update: 2015-02-26 17:06:15
version version: 20
version ubuntu: 20150219
version device: 20150225-b67e0b6
version custom: 20150216-561-29-186

[Raymond (superquad-vortex2)]

it look like qaudiorecorder bug

in qaudioinput_alsa_p.cpp

buffer_time = 100000;
    period_time = 20000;

but chunks = 8

if ( !fatal ) {

        err = snd_pcm_hw_params_set_buffer_time_near(handle, hwparams, &buffer_time, &dir);

        if ( err < 0 ) {

            fatal = true;

            errMessage = QString::fromLatin1("QAudioInput: snd_pcm_hw_params_set_buffer_time_near: err = %1").arg(err);

        }

    }

    if ( !fatal ) {

        err = snd_pcm_hw_params_set_period_time_near(handle, hwparams, &period_time, &dir);

        if ( err < 0 ) {

            fatal = true;

            errMessage = QString::fromLatin1("QAudioInput: snd_pcm_hw_params_set_period_time_near: err = %1").arg(err);

        }

    }

    if ( !fatal ) {

        err = snd_pcm_hw_params_set_periods_near(handle, hwparams, &chunks, &dir);

        if ( err < 0 ) {

            fatal = true;

            errMessage = QString::fromLatin1("QAudioInput: snd_pcm_hw_params_set_periods_near: err = %1").arg(err);

        }

    }

    if ( !fatal ) {

        err = snd_pcm_hw_params(handle, hwparams);

        if ( err < 0 ) {

            fatal = true;

            errMessage = QString::fromLatin1("QAudioInput: snd_pcm_hw_params: err = %1").arg(err);

        }

    }

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Launchpad Janitor (janitor)]

This bug was fixed in the package gst-plugins-good0.10 - 0.10.31-3+nmu1ubuntu7

---------------
gst-plugins-good0.10 (0.10.31-3+nmu1ubuntu7) vivid; urgency=medium

  * debian/patches/0001-pulsesrc-improve-clock-handling.patch:
    - Cherry-pick from upstream to fix deadlock when recording
      (LP: #1433563)
 -- Ricardo Salveti de Araujo <email address hidden> Sun, 19 Apr 2015 20:02:41 -0300

[Launchpad Janitor (janitor)]

This bug was fixed in the package qtmultimedia-opensource-src - 5.4.1-1ubuntu2

---------------
qtmultimedia-opensource-src (5.4.1-1ubuntu2) vivid; urgency=medium

  * debian/patches/debian/patches/qgstreamercapturesession_avoid_race_eos.patch:
    - Avoid races when sending EOS, making sure pipeline is in playing state
      first (LP: #1433563)
 -- Ricardo Salveti de Araujo <email address hidden> Sun, 19 Apr 2015 20:13:29 -0300