Audio not playing from .qrc resources

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();
}