C++ mlt::Producer类代码示例

void BinController::duplicateFilters(Mlt::Producer original, Mlt::Producer clone)
{
    Mlt::Service clipService(original.get_service());
    Mlt::Service dupService(clone.get_service());
    //delete original;
    //delete clone;
    int ct = 0;
    Mlt::Filter *filter = clipService.filter(ct);
    while (filter) {
        // Only duplicate Kdenlive filters, and skip the fade in effects
        //fprintf(stderr, "CHKNG FILTER: %s\n", filter->get("kdenlive_id"));
        if (filter->is_valid()/* && strcmp(filter->get("kdenlive_id"), "") && strcmp(filter->get("kdenlive_id"), "fadein") && strcmp(filter->get("kdenlive_id"), "fade_from_black")*/) {
            // looks like there is no easy way to duplicate a filter,
            // so we will create a new one and duplicate its properties
            Mlt::Filter *dup = new Mlt::Filter(*original.profile(), filter->get("mlt_service"));
            if (dup && dup->is_valid()) {
                Mlt::Properties entries(filter->get_properties());
                for (int i = 0; i < entries.count(); ++i) {
                    dup->set(entries.get_name(i), entries.get(i));
                }
                dupService.attach(*dup);
            }
        }
        ct++;
        filter = clipService.filter(ct);
    }
}

Mlt::Producer* JackProducerWidget::newProducer(Mlt::Profile& profile)
{
    Mlt::Producer* p = new Mlt::Producer(profile, "jack:Shotcut");
    p->set(kBackgroundCaptureProperty, 1);
    p->set(kShotcutCaptionProperty, "JACK");
    return p;
}

bool MltPreview::create(const QString &path, int width, int height, QImage &img)
{
    Mlt::Profile *profile = new Mlt::Profile("dv_pal");
    Mlt::Producer *producer = new Mlt::Producer(*profile, path.toUtf8().data());


    if (producer->is_blank()) {
        delete producer;
        return false;
    }
    int frame = 75;
    uint variance = 10;
    int ct = 1;

    //img = getFrame(producer, frame, width, height);

    while (variance <= 40 && ct < 4) {
        img = getFrame(producer, frame, width, height);
        variance = imageVariance(img);
        frame += 100 * ct;
        ct++;
    }

    delete producer;
    delete profile;
    return (img.isNull() == false);
}

Mlt::Producer* IsingWidget::producer(Mlt::Profile& profile)
{
    Mlt::Producer* p = new Mlt::Producer(profile, "frei0r.ising0r");
    p->set(kParamTemperature, ui->tempSpinner->text().toLatin1().constData());
    p->set(kParamBorderGrowth, ui->borderGrowthSpinner->text().toLatin1().constData());
    p->set(kParamSpontaneous, ui->spontGrowthSpinner->text().toLatin1().constData());
    return p;
}

Mlt::Producer* DecklinkProducerWidget::producer(Mlt::Profile& profile)
{
    Mlt::Producer* p = new Mlt::Producer(profile,
        QString("consumer:decklink:%1").arg(ui->deviceCombo->currentIndex()).toAscii().constData());
    if (p->is_valid())
        p->set("profile", ui->profileCombo->itemData(ui->profileCombo->currentIndex()).toString().toAscii().constData());
    return p;
}

void TimelineDock::selectTrackHead(int trackIndex)
{
    if (trackIndex >= 0) {
        int i = m_model.trackList().at(trackIndex).mlt_index;
        Mlt::Producer* producer = m_model.tractor()->track(i);
        if (producer && producer->is_valid())
            emit trackSelected(producer);
        delete producer;
    }
}

void ImageProducerWidget::on_durationSpinBox_editingFinished()
{
    if (!m_producer)
        return;
    if (ui->durationSpinBox->value() == m_producer->get_out() + 1)
        return;
    Mlt::Producer* p = producer(MLT.profile());
    p->pass_list(*m_producer, "force_aspect_ratio, shotcut_aspect_num, shotcut_aspect_den,"
        "shotcut_resource, resource, ttl, shotcut_sequence");
    reopen(p);
}

void TimelineDock::openClip(int trackIndex, int clipIndex)
{
    Q_ASSERT(trackIndex >= 0 && clipIndex >= 0);
    QScopedPointer<Mlt::ClipInfo> info(getClipInfo(trackIndex, clipIndex));
    if (info) {
        QString xml = MLT.XML(info->producer);
        Mlt::Producer* p = new Mlt::Producer(MLT.profile(), "xml-string", xml.toUtf8().constData());
        p->set_in_and_out(info->frame_in, info->frame_out);
        emit clipOpened(p);
    }
}

void ClearCommand::undo()
{
    m_model.close();
    Mlt::Producer* producer = new Mlt::Producer(MLT.profile(), "xml-string", m_xml.toUtf8().constData());
    if (producer->is_valid()) {
        producer->set("resource", "<playlist>");
        MAIN.open(producer);
        MLT.pause();
        MAIN.seekPlaylist(0);
    }
}

Mlt::Producer* PlasmaWidget::producer(Mlt::Profile& profile)
{
    Mlt::Producer* p = new Mlt::Producer(profile, "frei0r.plasma");
    p->set(kParamSpeed1, ui->speed1Spinner->text().toAscii().constData());
    p->set(kParamSpeed2, ui->speed2Spinner->text().toAscii().constData());
    p->set(kParamSpeed3, ui->speed3Spinner->text().toAscii().constData());
    p->set(kParamSpeed4, ui->speed4Spinner->text().toAscii().constData());
    p->set(kParamMove1, ui->move1Spinner->text().toAscii().constData());
    p->set(kParamMove2, ui->move2Spinner->text().toAscii().constData());
    return p;
}

QMimeData *PlaylistModel::mimeData(const QModelIndexList &indexes) const
{
    QMimeData *mimeData = new QMimeData;
    Mlt::ClipInfo* info = m_playlist->clip_info(indexes.first().row());
    if (info) {
        Mlt::Producer* producer = info->producer;
        producer->set_in_and_out(info->frame_in, info->frame_out);
        mimeData->setData(Mlt::XmlMimeType, MLT.saveXML("string", producer).toUtf8());
        producer->set_in_and_out(0, -1);
        delete info;
    }
    return mimeData;
}

QString ThumbnailProvider::cacheKey(Mlt::Producer& producer, int frameNumber)
{
    QString time = producer.frames_to_time(frameNumber, mlt_time_clock);
    // Reduce the precision to centiseconds to increase chance for cache hit
    // without much loss of accuracy.
    time = time.left(time.size() - 1);
    QString key = QString("%1 %2")
            .arg(producer.get("resource"))
            .arg(time);
    QCryptographicHash hash(QCryptographicHash::Sha1);
    hash.addData(key.toUtf8());
    return hash.result().toHex();
}

void ImageProducerWidget::on_sequenceCheckBox_clicked(bool checked)
{
    QString resource = m_producer->get("resource");
    ui->repeatSpinBox->setEnabled(checked);
    if (checked && !m_producer->get(kShotcutResourceProperty))
        m_producer->set(kShotcutResourceProperty, resource.toUtf8().constData());
    m_producer->set(kShotcutSequenceProperty, checked);
    m_producer->set("ttl", ui->repeatSpinBox->value());
    if (checked) {
        QFileInfo info(resource);
        QString name(info.fileName());
        QString begin = "";
        int i = name.length();
        int count = 0;

        // find the last numeric digit
        for (; i && !name[i - 1].isDigit(); i--) {};
        // count the digits and build the begin value
        for (; i && name[i - 1].isDigit(); i--, count++)
            begin.prepend(name[i - 1]);
        if (count) {
            m_producer->set("begin", begin.toLatin1().constData());
            int j = begin.toInt();
            name.replace(i, count, begin.prepend('%').append('d'));
            resource = info.path() + "/" + name;
            m_producer->set("resource", resource.toUtf8().constData());

            // Count the number of consecutive files.
            MAIN.showStatusMessage(tr("Getting length of image sequence..."));
            name = info.fileName();
            name.replace(i, count, "%1");
            resource = info.path().append('/').append(name);
            for (i = j; QFile::exists(resource.arg(i, count, 10, QChar('0'))); ++i);
            i -= j;
            m_producer->set("length", i);
            ui->durationSpinBox->setValue(i);
            MAIN.showStatusMessage(tr("Reloading image sequence..."));
        }
    }
    else {
        m_producer->set("resource", m_producer->get(kShotcutResourceProperty));
        m_producer->set("length", qRound(MLT.profile().fps() * 600));
        ui->durationSpinBox->setValue(qRound(MLT.profile().fps() * Settings.imageDuration()));
    }
    Mlt::Producer* p = producer(MLT.profile());
    p->pass_list(*m_producer, "force_aspect_ratio,"
        kAspectRatioNumerator "," kAspectRatioDenominator ","
        kShotcutResourceProperty ", resource, ttl, length," kShotcutSequenceProperty);
    reopen(p);
}

Mlt::Producer* AlsaWidget::newProducer(Mlt::Profile& profile)
{
    QString s("alsa:%1");
    if (ui->lineEdit->text().isEmpty())
        s = s.arg("default");
    else
        s = s.arg(ui->lineEdit->text());
    if (ui->alsaChannelsSpinBox->value() > 0)
        s += QString("?channels=%1").arg(ui->alsaChannelsSpinBox->value());
    Mlt::Producer* p = new Mlt::Producer(profile, s.toUtf8().constData());
    p->set(kBackgroundCaptureProperty, 1);
    p->set(kShotcutCaptionProperty, "ALSA");
    return p;
}

Mlt::Producer *BinController::getBinVideoProducer(const QString &id)
{
    QString videoId = id + "_video";
    if (!m_extraClipList.contains(videoId)) {
        // create clone
        QString originalId = id.section(QStringLiteral("_"), 0, 0);
        Mlt::Producer *original = getBinProducer(originalId);
        Mlt::Producer *videoOnly = cloneProducer(*original);
        videoOnly->set("audio_index", -1);
        videoOnly->set("id", videoId.toUtf8().constData());
        m_extraClipList.insert(videoId, videoOnly);
        return videoOnly;
    }
    return m_extraClipList.value(videoId);
}