QT6.2: QMediaPlayer & QByteArray
QT6.2: QMediaPlayer & QByteArray
提问于 2021-10-07 12:01:19
日安。有人在QT6.2中尝试过QMediaPlayer吗？我正在尝试这段代码，但是媒体状态始终保持为"NoMedia“，没有任何声音:)。全面测试项目：https://github.com/avttrue/MediaPlayerTest
#include "mainwindow.h"
#include <QDebug>
#include <QBuffer>
#include <QFile>
#include <QAudioOutput>
#include <QMediaPlayer>
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
{
QFile file("../test/Bankrobber.mp3");
if(!file.open(QIODevice::ReadOnly))
qDebug() << "File not opened";
qDebug() << "File size:" << file.size(); // File size: 11181085
QByteArray ba = file.readAll();
qDebug() << "ByteArray size:" << ba.size(); // ByteArray size: 11181085
QBuffer* buffer = new QBuffer(this);
buffer->setData(ba);
if(!buffer->open(QIODevice::ReadOnly))
qDebug() << "Buffer not opened";
qDebug() << "Buffer size:" << buffer->size(); // Buffer size: 11181085
buffer->seek(qint64(0));
auto audioOutput = new QAudioOutput(this);
auto player = new QMediaPlayer(this);
player->setAudioOutput(audioOutput);
audioOutput->setVolume(50);
player->setSourceDevice(buffer);
qDebug() << "Device:" << player->sourceDevice(); // Device: QBuffer(0x563180493020)
QObject::connect(player, &QMediaPlayer::mediaStatusChanged,
[=](QMediaPlayer::MediaStatus status)
{ qDebug() << "MediaStatus:" << player->mediaStatus() << "|" << status; });
QObject::connect(player, &QMediaPlayer::errorOccurred,
[=](QMediaPlayer::Error error)
{ qDebug() << "Error:" << player->errorString() << "|" << error; });
QObject::connect(player, &QMediaPlayer::playbackStateChanged,
[=](QMediaPlayer::PlaybackState state)
{ qDebug() << "PlaybackState:" << player->playbackState() << "|" << state; });
player->play();
qDebug() << "MediaStatus:" << player->mediaStatus(); // MediaStatus: QMediaPlayer::NoMedia
} 回答 2
Stack Overflow用户
发布于 2021-10-07 13:20:32
您使用的函数setSourceDevice()没有执行您认为的操作？也许你想要setSource()代替？
Qt有很好的文档：https://doc.qt.io/qt-6/qmediaplayer.html#setSourceDevice
即使是很好的例子：
player = new QMediaPlayer;
audioOutput = new QAudioOutput;
player->setAudioOutput(audioOutput);
connect(player, SIGNAL(positionChanged(qint64)), this, SLOT(positionChanged(qint64)));
player->setSource(QUrl::fromLocalFile("/Users/me/Music/coolsong.mp3"));
audioOutput->setVolume(50);
player->play();Stack Overflow用户
发布于 2021-10-07 14:24:06
也许这是变体，但我认为这并不好：
QTemporaryFile tfile;
if (!tfile.open())
qDebug() << "TemporaryFile not opened";
else
{
qDebug() << "TemporaryFile writed:" << tfile.write(ba);
if(tfile.size() != ba.size())
qDebug() << "TemporaryFile not complited";
else
player->setSource(QUrl::fromLocalFile(tfile.fileName()));
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/69480783
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