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.