Method computeFrameRangeForReader

Engine/Node.cpp:4552–4605

}

void
Node::computeFrameRangeForReader(KnobI* fileKnob)
{
    /*
       We compute the original frame range of the sequence for the plug-in
       because the plug-in does not have access to the exact original pattern
       hence may not exactly end-up with the same file sequence as what the user
       selected from the file dialog.
     */
    ReadNode* isReadNode = dynamic_cast<ReadNode*>( _imp->effect.get() );
    std::string pluginID;

    if (isReadNode) {
        NodePtr embeddedPlugin = isReadNode->getEmbeddedReader();
        if (embeddedPlugin) {
            pluginID = embeddedPlugin->getPluginID();
        }
    } else {
        pluginID = getPluginID();
    }

    int leftBound = std::numeric_limits<int>::min();
    int rightBound = std::numeric_limits<int>::max();
    ///Set the originalFrameRange parameter of the reader if it has one.
    KnobIPtr knob = getKnobByName(kReaderParamNameOriginalFrameRange);
    if (knob) {
        KnobInt* originalFrameRange = dynamic_cast<KnobInt*>( knob.get() );
        if ( originalFrameRange && (originalFrameRange->getDimension() == 2) ) {
            KnobFile* isFile = dynamic_cast<KnobFile*>(fileKnob);
            assert(isFile);
            if (!isFile) {
                throw std::logic_error("Node::computeFrameRangeForReader");
            }

            if ( ReadNode::isVideoReader(pluginID) ) {
                ///If the plug-in is a video, only ffmpeg may know how many frames there are
                originalFrameRange->setValues(std::numeric_limits<int>::min(), std::numeric_limits<int>::max(), ViewSpec::all(), eValueChangedReasonNatronInternalEdited);
            } else {
                std::string pattern = isFile->getValue();
                getApp()->getProject()->canonicalizePath(pattern);
                SequenceParsing::SequenceFromPattern seq;
                FileSystemModel::filesListFromPattern(pattern, &seq);
                if ( seq.empty() || (seq.size() == 1) ) {
                    leftBound = 1;
                    rightBound = 1;
                } else if (seq.size() > 1) {
                    leftBound = seq.begin()->first;
                    rightBound = seq.rbegin()->first;
                }
                originalFrameRange->setValues(leftBound, rightBound, ViewSpec::all(), eValueChangedReasonNatronInternalEdited);
            }
        }
    }
}


void