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Qt App couldn't detect my usb sound card

  • Hi
    I Run the Audiodevices example on my BBB but it seems the app couldn't detect my USB sound card.
    The program shows noting in all field.
    I'm wondering am I have to do something to export my USB sound card to my QT app like the

    export QWS_MOUSE_PROTO=LinuxInput:/dev/input/event1

    for adding Touch screen to my QT APP, Or it should be detect it automatically?
    This is the result of aplay -l

    card 0: default [C-Media USB Headphone Set], device 0: USB Audio [USB Audio]
      Subdevices: 1/1
      Subdevice #0: subdevice #0

    Any help will appreciated
    Thank You

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