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Unable to play a wav file with Audio component

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qt5.5.1colibri-t20
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  • zyendZ Offline
    zyendZ Offline
    zyend
    wrote on last edited by
    #11

    What do you mean exactly ?

    Yesterday, in the main.cpp, I dumped the

    QAudioDeviceInfo::availableDevices(QAudio::AudioOutput)
    

    Is that what you meant ? And yes, it dumps the same devices as with

    aplay -L
    
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    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #12

      That's that yes and the result also looks good.

      Did you check whether the element raises an error ?

      Interested in AI ? www.idiap.ch
      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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      • zyendZ Offline
        zyendZ Offline
        zyend
        wrote on last edited by
        #13

        No error raised.

        However, in the onClick() handler where idPlay->play() is launched (see code snippet above..),
        I traced the values of some properties of tha Audio component.

        qml: status =  2
        qml: playvolume =  1
        qml: muted =  false
        qml: error code =  0 , string=
        qml: src =  file:///opt/pga/track00.wav
        qml: availability =  0
        qml: duration =  -1
        qml: hasAudio =  false
        

        Weird. duration = -1, hasAudio = false and however, no error code / string...

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        • SGaistS Offline
          SGaistS Offline
          SGaist
          Lifetime Qt Champion
          wrote on last edited by
          #14

          The path to the file looks different from your QML sample code.

          Interested in AI ? www.idiap.ch
          Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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          • zyendZ Offline
            zyendZ Offline
            zyend
            wrote on last edited by
            #15

            Yes, because I changed the path between my tests, but the paths are valids.

            I really don't understand why Qt does not raise any error.
            Everything looks correct.
            status = 2, that is: "the Media has been loaded".

            So it looks like a final phase is not complete. Isn't it ?

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            • SGaistS Offline
              SGaistS Offline
              SGaist
              Lifetime Qt Champion
              wrote on last edited by
              #16

              Can you test the functionality with C++ ?

              Interested in AI ? www.idiap.ch
              Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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              • zyendZ Offline
                zyendZ Offline
                zyend
                wrote on last edited by zyend
                #17

                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.

                :(

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                • SGaistS Offline
                  SGaistS Offline
                  SGaist
                  Lifetime Qt Champion
                  wrote on last edited by
                  #18

                  Ok...

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

                  Interested in AI ? www.idiap.ch
                  Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                  • zyendZ Offline
                    zyendZ Offline
                    zyend
                    wrote on last edited by
                    #19

                    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
                    
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                    • SGaistS Offline
                      SGaistS Offline
                      SGaist
                      Lifetime Qt Champion
                      wrote on last edited by
                      #20

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

                      Interested in AI ? www.idiap.ch
                      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                      • zyendZ Offline
                        zyendZ Offline
                        zyend
                        wrote on last edited by
                        #21

                        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.

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                        • SGaistS Offline
                          SGaistS Offline
                          SGaist
                          Lifetime Qt Champion
                          wrote on last edited by
                          #22

                          Did you install the plugin properly after having built it ?

                          Interested in AI ? www.idiap.ch
                          Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                          • zyendZ Offline
                            zyendZ Offline
                            zyend
                            wrote on last edited by
                            #23

                            What do you mean "install properly" ?

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                            • SGaistS Offline
                              SGaistS Offline
                              SGaist
                              Lifetime Qt Champion
                              wrote on last edited by
                              #24

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

                              Interested in AI ? www.idiap.ch
                              Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                              • zyendZ Offline
                                zyendZ Offline
                                zyend
                                wrote on last edited by zyend
                                #25

                                Yes.

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

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                                • SGaistS Offline
                                  SGaistS Offline
                                  SGaist
                                  Lifetime Qt Champion
                                  wrote on last edited by
                                  #26

                                  On your target ?

                                  Interested in AI ? www.idiap.ch
                                  Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                                  • zyendZ Offline
                                    zyendZ Offline
                                    zyend
                                    wrote on last edited by
                                    #27

                                    Yes, of course.

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                                    • SGaistS Offline
                                      SGaistS Offline
                                      SGaist
                                      Lifetime Qt Champion
                                      wrote on last edited by
                                      #28

                                      How big is your audio file ?

                                      Interested in AI ? www.idiap.ch
                                      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                                      • zyendZ Offline
                                        zyendZ Offline
                                        zyend
                                        wrote on last edited by
                                        #29

                                        ~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...

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                                        • SGaistS Offline
                                          SGaistS Offline
                                          SGaist
                                          Lifetime Qt Champion
                                          wrote on last edited by
                                          #30

                                          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)

                                          Interested in AI ? www.idiap.ch
                                          Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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