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The MP3Player was developed using C++ and Qt Libraries. The Qt used was version 5.4 and it was based on the example multimediawidgets/player. It is a MP3Player with some additional functions.
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IMPORTANT (to use)
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While implementing the software I had problems to execute some mp3 files.
Library that allows you to check the battery level and set the volume limit of your Zen Stone mp3 player. It's also a simple example of how to communicate with USB mass-storage device with libusb.