Exemple #1
0
QGst::BinPtr GstExporter::createVideoMixer() {
  qDebug() << "createVideoMixer start";
  QGst::BinPtr videoMixerBin = QGst::Bin::create();

  try {
    QGst::ElementPtr videoMixer =
        QGst::ElementFactory::make("videomixer", "mix");
    videoMixer->setProperty("background", (int) 1); //black background
    videoMixerBin->add(videoMixer);
    int count = 0;
    // go through every element in the grid
    for (int i = 0; i < rec_->grid.height; ++i) {
      for (int j = 0; j < rec_->grid.width; ++j) {
        VideoFile* current = &rec_->grid.grid[i][j];
        if (current->id != 0) {
          qDebug() << "Working on video[" << i << "][" << j
                   << "] with id: " << current->id;

          QGst::PadPtr pad = videoMixer->getRequestPad("sink_%u");
          pad->setProperty("ypos", i * elementHeightPx);
          pad->setProperty("xpos", j * elementWidthPx);
          qDebug() << "Pad created with xpos: " << pad->property("xpos")
                   << ", ypos: " << pad->property("ypos");
          QGst::BinPtr filesrc = createFileSrcBin(current->filepath, count);
          videoMixerBin->add(filesrc);

          QGst::PadPtr sourcepad = filesrc->getStaticPad("src");
          sourcepad->link(pad);
          ++count;
        }
      }
    }
    QGst::PadPtr mixSrcPad = videoMixer->getStaticPad("src");
    videoMixerBin->addPad(QGst::GhostPad::create(mixSrcPad, "src"));

  } catch (const QGlib::Error& error) {
    qDebug() << "Failed to create a videomixer:" << error;
    return QGst::BinPtr();
  }

  return videoMixerBin;
}
void QtGStreamerCaptureBackend::startCapture(const QString &filePath)
{
    // clear pipeline if still existing
    if (m_pipeline) {
        qCWarning(LIBSOUND_LOG) << "removing forgotten pipeline";
        //send an end-of-stream event to flush metadata and cause an EosMessage to be delivered
        m_pipeline->sendEvent(QGst::EosEvent::create());
    }

    QGst::BinPtr audioSrcBin = createAudioSrcBin();
    QGst::ElementPtr mux = QGst::ElementFactory::make("oggmux");
    QGst::ElementPtr sink = QGst::ElementFactory::make("filesink");

    if (!audioSrcBin || !mux || !sink) {
        qCritical() << "One or more elements could not be created. "
                 << "Verify that you have all the necessary element plugins installed.";
        return;
    }

    // set output path
    sink->setProperty("location", filePath);

    m_pipeline = QGst::Pipeline::create();
    m_pipeline->add(audioSrcBin, mux, sink);

    //link elements
    QGst::PadPtr audioPad = mux->getRequestPad("audio_%u");
    audioSrcBin->getStaticPad("src")->link(audioPad);

    mux->link(sink);

    //connect the bus
    m_pipeline->bus()->addSignalWatch();
    QGlib::connect(m_pipeline->bus(), "message", this, &QtGStreamerCaptureBackend::onBusMessage);
    m_pipeline->setState(QGst::StatePlaying);
}