I want to get album art image from mp3 files

[rhaps20]

os: debian11
qt version: 6.4.2
target : android

I implemented like this,

void MainWindow::metaDataChanged() {
        metaData = mediaPlayer->metaData();
        titleLabel->setText(metaData.stringValue(QMediaMetaData::Title));
        albumLabel->setText(metaData.stringValue(QMediaMetaData::AlbumTitle));
        artistLabel->setText(metaData.stringValue(QMediaMetaData::AlbumArtist));
    
    
        QVariant var = metaData.value(QMediaMetaData::CoverArtImage);
        QImage image = var.value<QImage>();
    
        albumArtLabel->setPixmap(QPixmap::fromImage(image));
    }
    

This code is same with Qt Librarie's example source code[project name : Player].

But it's not working...

could you give me a tip?

[SGaist]

Hi,

Why start a new thread when there was already that one ?

That said, are you sure you are not doing that too early ? i.e. before the file has been loaded ?

[rhaps20]

@SGaist said in I want to get album art image from mp3 files:

Hi,
Why start a new thread when there was already that one ?
That said, are you sure you are not doing that too early ? i.e. before the file has been loaded ?

I didn't start new thread.

when metadata is changed, the function containing the above code is executed.

[rhaps20]

@SGaist said in I want to get album art image from mp3 files:

Hi,
Why start a new thread when there was already that one ?
That said, are you sure you are not doing that too early ? i.e. before the file has been loaded ?

I succeeded the load the title, artist, album title.

but, I can't load the album image...

[SGaist]

Does the documentation example show it properly ?

[rhaps20]

@SGaist ```
if (key == QMediaMetaData::CoverArtImage) {
270 QVariant v = metaData.value(key);
271 if (QLabel cover = qobject_cast<QLabel>(m_metaDataFields[key])) {
272 QImage coverImage = v.value<QImage>();
273 cover->setPixmap(QPixmap::fromImage(coverImage));
274 }

This is part of example source code...

[SGaist]

That was not my question.
The question was whether when you run the example, it shows the image for the file you are trying to load with your own application.

[rhaps20]

This post is deleted!

[rhaps20]

I tried build my project to Desktop version. It also didn't show cover image.

[rhaps20]

@SGaist
Example project show image well.

[SGaist]

So compare your code with the example to find the difference that makes yours fail.

[rhaps20]

@SGaist
It seems to be a limited situation only when built with the PC version. I think its impossible on android version.

[SGaist]

I am not sure to follow you. It works on your desktop but not on Android ?

[rhaps20]

@SGaist said in I want to get album art image from mp3 files:

I am not sure to follow you. It works on your desktop but not on Android ?

void Player::metaDataChanged()
{
    auto metaData = m_player->metaData();
    setTrackInfo(QString("%1 - %2")
                         .arg(metaData.value(QMediaMetaData::AlbumArtist).toString())
                         .arg(metaData.value(QMediaMetaData::Title).toString()));
 
#if !defined(Q_OS_ANDROID) && !defined(Q_OS_IOS)
    for (int i = 0; i < QMediaMetaData::NumMetaData; i++) {
        if (QLineEdit *field = qobject_cast<QLineEdit *>(m_metaDataFields[i]))
            field->clear();
        else if (QLabel *label = qobject_cast<QLabel *>(m_metaDataFields[i]))
            label->clear();
        m_metaDataFields[i]->setDisabled(true);
        m_metaDataLabels[i]->setDisabled(true);
    }
 
    for (auto &key : metaData.keys()) {
        int i = int(key);
        if (key == QMediaMetaData::CoverArtImage) {
            QVariant v = metaData.value(key);
            if (QLabel *cover = qobject_cast<QLabel *>(m_metaDataFields[key])) {
                QImage coverImage = v.value<QImage>();
                cover->setPixmap(QPixmap::fromImage(coverImage));
            }
        } else if (key == QMediaMetaData::ThumbnailImage) {
            QVariant v = metaData.value(key);
            if (QLabel *thumbnail = qobject_cast<QLabel *>(m_metaDataFields[key])) {
                QImage thumbnailImage = v.value<QImage>();
                thumbnail->setPixmap(QPixmap::fromImage(thumbnailImage));
            }
        } else if (QLineEdit *field = qobject_cast<QLineEdit *>(m_metaDataFields[key])) {
            QString stringValue = metaData.stringValue(key);
            field->setText(stringValue);
        }
        m_metaDataFields[i]->setDisabled(false);
        m_metaDataLabels[i]->setDisabled(false);
    }
#endif
}

It's a part of example source code.

If you look at this source code, you will understand what I mean.

"#if !defined(Q_OS_ANDROID) && !defined(Q_OS_IOS)"

[SGaist]

So from the looks of it, it's a metadata that cannot be retrieved on these two platforms for some reason like not provided by the platform API.