C++ ElementPtr::getStaticPad方法代码示例

QGst::BinPtr GstExporter::createDecoder(const int i) {
  qDebug() << "createDecoder start, i: " << i;
  char* decArray = nameWithIndex("decoder", i);
  QGst::BinPtr decoderBin;
  try {
    decoderBin = QGst::Bin::create(decArray);
    QGst::ElementPtr parser = QGst::ElementFactory::make("h264parse");
    QGst::ElementPtr decoder;
    if (usesOmx) {
      decoder = QGst::ElementFactory::make("omxh264dec");
    } else {
      decoder = QGst::ElementFactory::make("avdec_h264");
    }
    decoderBin->add(parser, decoder);
    parser->link(decoder);

    QGst::PadPtr parserSinkPad = parser->getStaticPad("sink");
    QGst::PadPtr decoderSrcPad = decoder->getStaticPad("src");

    // Add Ghostpads for abstraction
    decoderBin->addPad(QGst::GhostPad::create(parserSinkPad, "sink"));
    decoderBin->addPad(QGst::GhostPad::create(decoderSrcPad, "src"));

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

void GstExporter::callbackNewPad(const QGst::ElementPtr& sender,
                                 const QGst::PadPtr& pad) {
  QString padName = pad->name();
  qDebug() << "new pad created: " << padName;

  QString demuxerName = sender->name();
  QRegExp rx("(\\d+)");
  rx.indexIn(demuxerName);
  quint16 i = rx.cap(1).toInt();

  QString decoderQString = "decoder" + QString::number(i);
  QByteArray decoderBa = decoderQString.toLocal8Bit();
  char* decoderName = decoderBa.data();

  QGst::ElementPtr decoder = m_pipeline->getElementByName(decoderName);

  pad->link(decoder->getStaticPad("sink"));
}

QGst::BinPtr GstExporter::createFileSrcBin(const QString path, const int i) {
  qDebug() << "creating filesrc bin, path: " << path << " i: " << i;
  QGst::BinPtr videoBin;

  QDir current = QDir::current();
  current.cd("recordings");
  const QString fullPath = current.absoluteFilePath(path);

  try {
    char* srcname = nameWithIndex("file", i);
    QGst::ElementPtr src = QGst::ElementFactory::make("filesrc", srcname);
    src->setProperty("location", fullPath);

    char* demuxName = nameWithIndex("demux", i);
    QGst::ElementPtr demuxer = QGst::ElementFactory::make("qtdemux", demuxName);
    QGst::BinPtr decoder = createDecoder(i);
    QGst::ElementPtr scale = QGst::ElementFactory::make("videoscale");
    QGst::ElementPtr capsfilter =
        createCapsFilter(elementWidthPx, elementHeightPx);

    char* binname = nameWithIndex("filebin", i);
    videoBin = QGst::Bin::create(binname);

    videoBin->add(src, demuxer, decoder, capsfilter, scale);
    src->link(demuxer);
    videoBin->linkMany(decoder, scale, capsfilter);

    qDebug() << "filesrc bin: Added and linked all elements";

    QGst::PadPtr filterPadSrc = capsfilter->getStaticPad("src");
    videoBin->addPad(QGst::GhostPad::create(filterPadSrc, "src"));

    qDebug() << "filesrc bin: Added Ghostpad to the bin";

    QGlib::connect(demuxer, "pad-added", this, &GstExporter::callbackNewPad,
                   QGlib::PassSender);

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

  return videoBin;
}

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;
}

QGst::BinPtr GstRecorder::createVideoSrcBin() {
  QGst::BinPtr videoBin;

  try {
    videoBin = QGst::Bin::create();
    QGst::ElementPtr src = QGst::ElementFactory::make("v4l2src");
    src->setProperty("device", devicepath);

    qDebug() << "GstRecorder: v4l2src with device: " << devicepath;

    QGst::ElementPtr encoder;
    QGst::ElementPtr capsfilter =
        createCapsFilter(videoWitdhPx, videoHeightPx, framerate);

    //QGst::ElementPtr parse = QGst::ElementFactory::make("h264parse");
    //QGst::ElementPtr queue = QGst::ElementFactory::make("queue");

    if (usesOmx) {
      encoder = QGst::ElementFactory::make("omxh264enc");
    } else {
      encoder = QGst::ElementFactory::make("x264enc");
      qDebug() << "GstRecoder: created x264enc";
    }

    videoBin->add(src, capsfilter, encoder);
    videoBin->linkMany(src, capsfilter, encoder);

    qDebug() << "GstRecorder: createVideoSrcBin: added and linked the elements";

    QGst::PadPtr encoderSrcPad = encoder->getStaticPad("src");
    videoBin->addPad(QGst::GhostPad::create(encoderSrcPad, "src"));

  } catch (const QGlib::Error &error) {
    qDebug() << "Failed to create video source bin:" << error;
    return QGst::BinPtr();
  }
  return videoBin;
}

void VideoSinkController::initFromStreamingThread(const QGst::PadPtr & srcPad,
                                                  const QGst::PipelinePtr & pipeline)
{
    m_bin = QGst::Bin::create();
    m_tee = QGst::ElementFactory::make("tee");

    QGst::ElementPtr fakesink = QGst::ElementFactory::make("fakesink");
    fakesink->setProperty("sync", false);
    fakesink->setProperty("async", false);
    fakesink->setProperty("silent", true);
    fakesink->setProperty("enable-last-sample", false);

    m_bin->add(m_tee, fakesink);
    m_tee->getRequestPad("src_%u")->link(fakesink->getStaticPad("sink"));

    QGst::PadPtr binSinkPad = QGst::GhostPad::create(m_tee->getStaticPad("sink"), "sink");
    m_bin->addPad(binSinkPad);

    pipeline->add(m_bin);
    m_bin->syncStateWithParent();

    srcPad->link(binSinkPad);
}