QMediaPlayer don't play sound from QByteArray in macOS

ARASHz4

Hi
This is my code :

    QFile file("sound.mp3");
    file.open(QIODevice::ReadOnly);
    QByteArray arr = file.readAll();

    QMediaPlayer *player = new QMediaPlayer(this);

    QBuffer *buffer = new QBuffer(player);
    buffer->setData(arr);
    buffer->open(QIODevice::ReadOnly);
    player->setMedia(QMediaContent(),buffer);

    player->play();

This code work in windows fine but in macOS sound don't play, i can just play sound from file in macOS

SGaist

Hi,

From a quick look at the current macOS implementation, it seems that the device is not used in the backend.

merlinko

@SGaist I have the same problem. Can you please explain what does that mean? It just does not work on mac?

SGaist

Yes, that's that. However, you don't need a QBuffer if you already load from a file. Just use it with QMediaPlayer..

merlinko

@SGaist But that is much slower :/ that is the problem

mpergand

Maybe as a alternative, you can use the MediaContent instead of a buffer for preloading sound files:

QMediaPlayer* mp=new QMediaPlayer;
mp->setMedia(QUrl::fromLocalFile("some.mp3"));

QMediaContent mc=mp->media();  // get the MediaContent
delete mp;

 mp=new QMediaPlayer;  // create a new MedaiPlayer
 mp->setMedia(mc);  // set the media with the previous content

mp->setVolume(50);
mp->play();

Works for me with Qt 5.8, OSX 10.9

[EDIT]
no need of MediaPlayer for loading !

QMediaContent(const QUrl &url)

will work alone ;)

VaL Doroshchuk

https://bugreports.qt.io/browse/QTBUG-69101