Skip to content
  • Categories
  • Recent
  • Tags
  • Popular
  • Users
  • Groups
  • Search
  • Get Qt Extensions
  • Unsolved
Collapse
Brand Logo
  1. Home
  2. Qt Development
  3. Mobile and Embedded
  4. Unable to play a wav file with Audio component
Forum Updated to NodeBB v4.3 + New Features

Unable to play a wav file with Audio component

Scheduled Pinned Locked Moved Unsolved Mobile and Embedded
qt5.5.1colibri-t20
35 Posts 4 Posters 17.4k Views 1 Watching
  • Oldest to Newest
  • Newest to Oldest
  • Most Votes
Reply
  • Reply as topic
Log in to reply
This topic has been deleted. Only users with topic management privileges can see it.
  • SGaistS Offline
    SGaistS Offline
    SGaist
    Lifetime Qt Champion
    wrote on last edited by
    #10

    Looks good on that point.

    Did you check which output QtMultimedia sees as available ?

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

    1 Reply Last reply
    0
    • 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
      
      O 1 Reply Last reply
      0
      • 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

        1 Reply Last reply
        0
        • 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...

          1 Reply Last reply
          0
          • 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

            1 Reply Last reply
            0
            • 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 ?

              1 Reply Last reply
              0
              • 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

                1 Reply Last reply
                0
                • 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.

                  :(

                  1 Reply Last reply
                  0
                  • 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

                    1 Reply Last reply
                    0
                    • 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
                      
                      1 Reply Last reply
                      0
                      • 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

                        1 Reply Last reply
                        0
                        • 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.

                          1 Reply Last reply
                          0
                          • 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

                            1 Reply Last reply
                            0
                            • zyendZ Offline
                              zyendZ Offline
                              zyend
                              wrote on last edited by
                              #23

                              What do you mean "install properly" ?

                              1 Reply Last reply
                              0
                              • 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

                                1 Reply Last reply
                                0
                                • zyendZ Offline
                                  zyendZ Offline
                                  zyend
                                  wrote on last edited by zyend
                                  #25

                                  Yes.

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

                                  1 Reply Last reply
                                  0
                                  • 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

                                    1 Reply Last reply
                                    0
                                    • zyendZ Offline
                                      zyendZ Offline
                                      zyend
                                      wrote on last edited by
                                      #27

                                      Yes, of course.

                                      1 Reply Last reply
                                      0
                                      • 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

                                        1 Reply Last reply
                                        0
                                        • 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...

                                          1 Reply Last reply
                                          0

                                          • Login

                                          • Login or register to search.
                                          • First post
                                            Last post
                                          0
                                          • Categories
                                          • Recent
                                          • Tags
                                          • Popular
                                          • Users
                                          • Groups
                                          • Search
                                          • Get Qt Extensions
                                          • Unsolved