Play video from buffer and append buffer while the video playing

[l2m2]

I would like to play video from buffer and append buffer while the video playing. Any ideas ?

some dirty code:

QAVPlayer p;
QSharedPointer<QIODevice> avBuffer(new QBuffer());
avBuffer->open(QIODevice::ReadWrite);
QSharedPointer<QAVIODevice> dev(new QAVIODevice(avBuffer));
p.setInputFormat(QStringLiteral("h264"));
p.setSource(QStringLiteral("buffer"), dev);

QtConcurrent::run([avBuffer](){
    QString fileName = QStringLiteral("xxx.dat");
    QFile file(fileName);
    if (!file.open(QIODevice::ReadOnly)) {
        qDebug() << "open file failed.";
        return;
    }
    QByteArray buffer;
    while (1) {
        buffer.resize(64 * 1024);
        auto bytesRead = file.read(buffer.data(), buffer.size());
        if (bytesRead <= 0)
            break;
        if (bytesRead < buffer.size())
            buffer.resize(bytesRead);

        auto after = processByteArray(buffer);
        if (!after.isEmpty()) {
            avBuffer->write(after, after.size());
        }
    }
});
p.play();

Is it right?

[geminixdev]

Look at QIODevice, and implement your buffer within that. QIODevice has all to handle such situations.

Look also at QAVAuudioOutput, it contains a solution for exactly that, to add constantly new data (here audio data) for output.

[valbok]

Hi, there is an example https://github.com/valbok/QtAVPlayer/blob/master/examples/qml_video/main.cpp#L176

    QSharedPointer<QAVIODevice> qrc;
    QSharedPointer<QIODevice> io(new QFile(file));
        if (io->open(QIODevice::ReadOnly))
            qrc.reset(new QAVIODevice(io));
    p.setSource(file, qrc);

Just need to implement usual QIODevice, if need to play from a buffer.

[valbok]

please reopen if you have any questions