Unable to play a wav file with Audio component

zyend

I've put this sample code in the C++ side:

init()
{
...
 connect(&m_player, SIGNAL(error(QMediaPlayer::Error)), this, SLOT(on_mediaPlayer_error(QMediaPlayer::Error)));^
 connect(&m_player, SIGNAL(stateChanged(QMediaPlayer::State)), this, SLOT(on_mediaPlayer_stateChanged(QMediaPlayer::State)));^
 connect(&m_player, SIGNAL(mediaStatusChanged(QMediaPlayer::MediaStatus)), this, 
SLOT(on_mediaPlayer_mediaStatusChanged(QMediaPlayer::MediaStatus)));

qDebug() << "Attempt to read mediacontent";
QMediaContent content(QUrl::fromLocalFile("/opt/pga/track00.wav"));
qDebug() << "MediaContent: isNull = " << content.isNull();
m_player.setMedia(content);
m_player.play();
}

Each of the slots above print the value of their respective parameter in stdout.

Output from my host linux:

Attempt to read mediacontent
MediaContent: isNull =  false
<MainWindow::on_mediaPlayer_mediaStatusChanged> status =  QMediaPlayer::LoadingMedia
<MainWindow::on_mediaPlayer_stateChanged> state =  QMediaPlayer::PlayingState
<MainWindow::on_mediaPlayer_mediaStatusChanged> status =  QMediaPlayer::BufferedMedia

Output from my colibri-t20:

Attempt to read mediacontent
MediaContent: isNull =  false
<MainWindow::on_mediaPlayer_mediaStatusChanged> status =  QMediaPlayer::LoadingMedia

It's stuck on LoadingMedia.
No more.

:(

SGaist

Ok...

You should rebuilt the plugin uncommenting the DEBUG_AUDIO define to see if it gives you more information about what is happening.

zyend

Hi,

Unfortunately it doesn't trace more information at all...

Found metadata in lib /usr/lib/qt5/plugins/audio/libqtaudio_alsa.so, metadata=
{
    "IID": "org.qt-project.qt.audiosystemfactory/5.0",
    "MetaData": {
        "Keys": [
            "alsa"
        ]
    },
    "className": "QAlsaPlugin",
    "debug": false,
    "version": 328961
}


Got keys from plugin meta data ("alsa")
QFactoryLoader::QFactoryLoader() checking directory path "/opt/pga/audio" ...
loaded library "/usr/lib/qt5/plugins/audio/libqtaudio_alsa.so"
DeviceInfo name =  "sysdefault:CARD=colibrit20wm971" , codecs =  "audio/pcm"
DeviceInfo name =  "default:CARD=colibrit20wm971" , codecs =  "audio/pcm"
DeviceInfo name =  "default" , codecs =  "audio/pcm"
Default OutputDevice:  "sysdefault:CARD=colibrit20wm971"
Attempt to read mediacontent
MediaContent: isNull =  false
<MainWindow::on_mediaPlayer_mediaStatusChanged> status =  QMediaPlayer::LoadingMedia , bufferStatus =  0
<MainWindow::initialize()> : bufferStatus =  0
screen dpi =  96.1517
screen geo =  QRect(0,0 480x800)
QFactoryLoader::QFactoryLoader() checking directory path "/usr/lib/qt5/plugins/accessiblebridge" ...
QFactoryLoader::QFactoryLoader() checking directory path "/opt/pga/accessiblebridge" ...
QSGContext::initialize: stencil buffer support missing, expect rendering errors
Updating catalog.
<MediaCatalog::roleNames() > called.
qml: size of catalog:  3
qml: playlaunched...status =  1
qml: playvolume =  1
qml: muted =  false
qml: error code =  0 , string=
qml: src =
qml: availability =  0
qml: duration =  -1
qml: hasAudio =  false

SGaist

Does the device info look correct for your system ?
Can you compare with that aplay uses ?

zyend

Yes, it is always the same.

I have also edited the qalsaaudiooutput.cpp and added some fprintf() statements and nothing is displayed in the console.
I put a message in open() and in the constructor

However, it prints loaded library "/usr/lib/qt5/plugins/audio/libqtaudio_alsa.so"

I don't know what I can do to figure out what's happening.

SGaist

Did you install the plugin properly after having built it ?

zyend

What do you mean "install properly" ?

SGaist

Are you sure that the plugin you modified was installed at the right location ?

zyend

Yes.

It was installed under /usr/lib/qt5/plugins/audio

SGaist

On your target ?

zyend

Yes, of course.

SGaist

How big is your audio file ?

zyend

~11 MB.

Would you test it ?

I have recompiled QtMultimedia without ALSA support and with PULSEAUDIO only.

In /usr/lib/qt5/plugins/audio I have only libqtmedia_pulse.so

Same thing when I launch my app again. libqtmedia_pulse.so plugin is loaded , and I have the same output as the one above...

It really seems that something is wrecked under...

SGaist

I likely would (and already would have done it) but I don't have such a board at hand.

And Rulseaudio is also working correctly ? (Without using Qt)

zyend

How can I test if pulseaudio is working fine ?

SGaist

I'd take a look at thist to check the setup.

voptiplex

@zyend - I know the topic is quite old, but could it be a simple explanation of a typo ?
You have called the Audio component:
id: audioPlayer
and then try to play with:
idPlayer.play()
I think it should be:
audioPlayer.play()

Maybe I am reading the post wrong.

OttoRyynanen

@zyend
Although this is an old post, I ended up here Googling for the pulse audio initialization and someone else might do so too so here's important info for the solution of the problem.
I too ran into issue that pulseaudio was no longer running since the

QAudioDeviceInfo::availableDevices(QAudio::AudioOutput)

had been dropped from the code. This call apparently starts pulseaudio daemon (among other things).
Returning it back fixed the issue.

SGaist

@OttoRyynanen Hi and welcome to devnet,

Thanks for sharing your findings !