Audio not playing from .qrc resources

[Xena_o]

@kshegunov here is final code

QFile file(":/music/music/sound.mp3");
    if (file.open(QIODevice::ReadOnly)) {
      player->setMedia(QMediaContent(nullptr), &file);
    } else {
      qDebug() << "Oops!";
    }

the accepted code is : QIODevice::ReadOnly and not QFile::Read
the file is in resources.qrc, i dont know how to figure if it is available

the ouptput: no oops, and QMediaPlayer::NoError QMediaPlayer::LoadingMedia

but still the sound is not playing. so far if i well understand, it is loading it, but thats it, not playing

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

this is doing nothing

[kshegunov]

@Xena_o said in Audio not playing from .qrc resources:

the accepted code is : QIODevice::ReadOnly and not QFile::Read

Yes, I don't compile example code before I post it, so there may be minor errors.

What does this output, have you checked the signals that are raised?

QObject::connect(player, &QMediaPlayer::bufferStatusChanged, this, [this] (int percent) -> void  {
    qDebug() << "QMediaPlayer::bufferStatusChanged" << percent;
});
QObject::connect(player, &QMediaPlayer::durationChanged, this, [this] (qint64 duration) -> void  {
    qDebug() << "QMediaPlayer::durationChanged" << duration;
});
QObject::connect(player, &QMediaPlayer::error, this, [this] (QMediaPlayer::Error code) -> void  {
    qDebug() << "QMediaPlayer::Error" << code;
});
QObject::connect(player, &QMediaPlayer::mediaStatusChanged, this, [this] (QMediaPlayer::MediaStatus status) -> void  {
    qDebug() << "QMediaPlayer::mediaStatusChanged" << status;
});
QObject::connect(player, &QMediaPlayer::stateChanged, this, [this] (QMediaPlayer::State state) -> void  {
    qDebug() << "QMediaPlayer::stateChanged" << state;
});

QFile file(":/music/music/sound.mp3");
if (file.open(QIODevice::ReadOnly)) {
    player->setMedia(QMediaContent(nullptr), &file);
} else {
    qDebug() << "Oops!";
}
player->setVolume(50);
player->play();

[Xena_o]

@kshegunov alright it is saying the media is invalid :

QMediaPlayer::mediaStatusChanged QMediaPlayer::LoadingMedia
QMediaPlayer::stateChanged QMediaPlayer::PlayingState
QMediaPlayer::mediaStatusChanged QMediaPlayer::InvalidMedia

but that is not true, it is an mp3 file, and it is reading from local directory, so why is it invalid from Resources ?!

[kshegunov]

As I said make absolutely certain that the file can be read.

const QString filePath(":/music/sound.mp3")
Q_ASSERT(QFile::exists(filePath));
...
QFile file(filePath);
if (file.open(QIODevice::ReadOnly)) {
   ...

[Xena_o]

@kshegunov Q_ASSERT(QFile::exists(filePath)); is not outputing anything and app is not crashing, so this means the file is available right? but still it is an invalid media, i tried to convert to .wav but still it is an invalid media !

[Xena_o]

i saw a post where people are copying the audio file from the resources file to a temporary local directory, then playing it from the local directory, then deleting it.

This means it is not possible to play audio from resources, its kind of insane, isnt it ?

[Xena_o]

const QString filePath(":/music/music/sound.mp3");
    Q_ASSERT(QFile::exists(filePath));

    QFile file2(QDir::tempPath() + "/temp0.mp3");

    if (file2.open(QIODevice::ReadWrite))
    {
        QFile workFile(filePath);
        if(workFile.open(QIODevice::ReadOnly))
        {
          file2.write(workFile.readAll());
          workFile.close();
        }

        file2.close();
    }
    player->setMedia(QUrl::fromLocalFile((QDir::tempPath() + "/temp0.mp3")));
    player->setVolume(50);
    player->play();

this code is working, but its too bad i need to copy from resources to temporary file to be able to play the audio, that is bad...

[Pl45m4]

@Xena_o said in Audio not playing from .qrc resources:

This means it is not possible to play audio from resources, its kind of insane, isnt it ?

I don't think that it's not possible.
Have you tried it using QSound instead of QMediaPlayer?

@aha_1980 said that it worked:

• https://forum.qt.io/topic/88581/how-to-play-a-wav-file-that-is-defined-in-resource-file/8

How does your resource file look like?

[Xena_o]

@Pl45m4 wow i get a progress with this !

QSound::play(":/music/music/sound.mp3"); throws
QSoundEffect(qaudio): Error decoding source file::/music/music/sound.mp3

but

QSound::play(":/music/music/sound.wav"); (i converted the file) this one is WORKING !

too bad it doesnt handle mp3 or maybe i need add extra params, will look it.

edit: seems QSound do not support mp3, too bad, well wav is better than nothing

thanks to everybody for participation and help :-)

[nagesh]

@Xena_o I have checked by adding .mp3 files to resource in QT musicplayer example,
and it's working perfectly fine.

I have accessed the url using

QUrl url = QUrl("qrc:///music/sound.mp3");
 player->setMedia(url);
player->play();

looks like there is no need to copy into temp file.

Got hint from Qt Doc for resources
https://doc.qt.io/qt-5/resources.html

For example, the file path :/images/cut.png or the URL qrc:///images/cut.png would give 
access to the cut.png file, whose location in the application's source tree 
is images/cut.png.

[Xena_o]

@nagesh wonderful ! thank you ! i tested it is working. AMediaPlayer offers more control than QSound.

[8Observer8]

My example works with Qt 6.2.4. You can download it from DropBox here. Many thanks to the guys in this topic: How to play sounds using QMediaPlayer

media-player-qt6-cpp.pro

QT       += core gui multimedia

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++17

# You can make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
    main.cpp \
    widget.cpp

HEADERS += \
    widget.h

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

RESOURCES += \
    audio.qrc

widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QtWidgets/QWidget>
#include <QtMultimedia/QMediaPlayer>

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();

private slots:
    void play();

private:
    QMediaPlayer mediaPlayer;
};
#endif // WIDGET_H

widget.cpp

#include "widget.h"
#include <QtCore/QUrl>
#include <QtWidgets/QPushButton>
#include <QtMultimedia/QAudioOutput>

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    mediaPlayer.setSource(QUrl("qrc:/assets/audio/music.wav"));
    mediaPlayer.setAudioOutput(new QAudioOutput);

    QPushButton *playButton = new QPushButton("Play", this);
    connect(playButton, &QPushButton::pressed, this, &Widget::play);

    connect(&mediaPlayer, &QMediaPlayer::mediaStatusChanged,
            [=](QMediaPlayer::MediaStatus status) -> void{ qDebug() << "QMediaPlayer::mediaStatusChanged" << status;}
    );
}

Widget::~Widget()
{
}

void Widget::play()
{
    mediaPlayer.play();
    qDebug() << "play";
}

main.cpp

#include "widget.h"

#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();
    return a.exec();
}