No Sound - "Maroon In Trouble" app on Android x86 (GCC 4.9, Qt 5.6.0)



  • I am trying to run the sample app, "Maroon In Trouble".
    But unfortunately this app does not play sound when run on Android Kit Kat (x86). What am I missing?

    My Platform is Android 4.4.4 on x86, Linux 3.10.20 (gcc ver. 4.7)
    Built for Android SDK "android-19",
    Using the Qt Creator 5.6.0 release, along with all the pre-packaged distribution of tools; GCC 4.9, etc. , I can build and deploy "Maroon in Trouble" to my Android device successfully, it runs (fish float & move), but sound does not work. I can also build and deploy the same project using VS2013 for the Win32 platform and fish float along with the addition of sound. It works.

    I did notice the following:

    • In the .pro file there is no QTPLUGIN += (should there be?)
    • There is a qtHaveModule(multimedia): QT+= multimedia (which should add multimedia support files?)
    • I have not modified the .pro or .qml source files, they are as distributed.
    • I do see an errors logged during application runtime (java class android.graphics.drawable.RippleDrawable is missing exceptions, etc.), but the one that really bothers me the most is:

    W/libmaroon(27239): qrc:///demos/maroon/content/SoundEffect.qml:45 ((null)): qrc:///demos/maroon/content/SoundEffect.qml:45: Error: Qt.createQmlObject(): failed to create object:
    W/libmaroon(27239): qrc:///demos/maroon/content/inline:1:1: module "QtMultimedia" is not installed

    Also, not sure what I should see, but the "Audio Devices" sample app can "output" to the "default" device, using the "audio/pcm" at various frequencies/settings, I see "Success" always returned. The AudioOutput sample can output a tone too. It's appears that QSoundEffect has an issue &/or multimedia is not installed/deployed for some reason on this platform?

    Also, the device is not rooted, so I am not sure if I should see pulseaudio or ALSA installed/running. There doesn't appear to be pactrl or pulseaudio installed or running (but other apps/games that use sound don't seem to have sound issues).

    I'm also having similar issues with my own app trying to using QSoundEffect.



  • This appears to be a QT Android deployment issue.
    It also looks like some sample apps are hard coded to particular Qt release?

    The following is what I did to fix sound for the Maroon sample app (a QtQuick/QML app) on Qt 5.6 for Android x86.

    The fix for: "Maroon In Trouble".
    Modified the resource: SoundEffect.qml:
    Added (missing!?):
    import QtMultimedia 5.6

    Modified the following line, changing the library from 5.0 to 5.6:
    property QtObject effect: Qt.createQmlObject("import QtMultimedia 5.6; SoundEffect{ source: '" + container.source + "'; muted: !Qt.application.active }", container);

    Applying the above changes added one additional library to the Android plugin/lib directory
    ...android-build\libs\x86\*.so -> libqml_QtMultimedia_libdeclarative_multimedia.so

    Note: libplugins_audio_libqtaudio_opensles.so was present in: ...android-build\libs\x86\ before I added the import statement, but this library may not have been actually deployed? (hence the log message "QtMultimedia" is not installed)

    Note: It appears that 5 additional dependencies from Qt are reported to be added to the package.

    It appears that it is not enough to have an entry in the *.pro for qtHaveModule(multimedia): QT += multimedia as the Qt sound libraries are not deployed? I think adding the import statement probably changed what was actually deployed, but someone better informed about apk's & how deployment works can probably explain this better.

    Now I need to understand how to do the equivalent deployment fix for my C++ app. Does anyone know the equivalent to the above "import" statement?, to ensure that ALL the multimedia files libraries/plugins are deployed? As I think I am running into the very same issue. Where does one put the import statement in a C++ app?

    Thanks in advance!
    Jake



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