#include <mist/defines.h>
#include <mist/mp4.h>
#include <mist/mp4_generic.h>
#include <mist/checksum.h>
#include <mist/bitfields.h>
#include "output_progressive_mp4.h"

namespace Mist {
  OutProgressiveMP4::OutProgressiveMP4(Socket::Connection & conn) : HTTPOutput(conn){}
  OutProgressiveMP4::~OutProgressiveMP4() {}
  
  void OutProgressiveMP4::init(Util::Config * cfg){
    HTTPOutput::init(cfg);
    capa["name"] = "MP4";
    capa["desc"] = "Enables HTTP protocol progressive streaming.";
    capa["url_rel"] = "/$.mp4";
    capa["url_match"] = "/$.mp4";
    capa["codecs"][0u][0u].append("H264");
    capa["codecs"][0u][1u].append("AAC");
    capa["codecs"][0u][1u].append("MP3");
    capa["methods"][0u]["handler"] = "http";
    capa["methods"][0u]["type"] = "html5/video/mp4";
    capa["methods"][0u]["priority"] = 8ll;
    capa["methods"][0u]["nolive"] = 1;
  }
  
  long long unsigned OutProgressiveMP4::estimateFileSize(){
    long long unsigned retVal = 0;
    for (std::set<unsigned long>::iterator it = selectedTracks.begin(); it != selectedTracks.end(); it++){
      for (std::deque<unsigned long>::iterator keyIt = myMeta.tracks[*it].keySizes.begin(); keyIt != myMeta.tracks[*it].keySizes.end(); keyIt++){
        retVal += *keyIt;
      }
    }
    return retVal * 1.1;
  }
  
  ///\todo This function does not indicate errors anywhere... maybe fix this...
  std::string OutProgressiveMP4::DTSCMeta2MP4Header(long long & size){
    //Make sure we have a proper being value for the size...
    size = 0;
    //Stores the result of the function
    std::stringstream header;
    //Determines whether the outputfile is larger than 4GB, in which case we need to use 64-bit boxes for offsets
    bool useLargeBoxes = (estimateFileSize() > 0xFFFFFFFFull);
    //Keeps track of the total size of the mdat box 
    uint64_t mdatSize = 0;


    //Start actually creating the header

    //MP4 Files always start with an FTYP box. Constructor sets default values
    MP4::FTYP ftypBox;
    header.write(ftypBox.asBox(), ftypBox.boxedSize());

    //Start building the moov box. This is the metadata box for an mp4 file, and will contain all metadata. 
    MP4::MOOV moovBox;
    //Keep track of the current index within the moovBox
    unsigned int moovOffset = 0;
    //calculating longest duration
    long long unsigned firstms = 0xFFFFFFFFFFFFFFull;
    long long unsigned lastms = 0;
    for (std::set<unsigned long>::iterator it = selectedTracks.begin(); it != selectedTracks.end(); it++) {
      lastms = std::max(lastms, myMeta.tracks[*it].lastms);
      firstms = std::min(firstms, myMeta.tracks[*it].firstms);
    }
    MP4::MVHD mvhdBox(lastms - firstms);
    //Set the trackid for the first "empty" track within the file.
    mvhdBox.setTrackID(selectedTracks.size() + 1);
    moovBox.setContent(mvhdBox, moovOffset++);

    for (std::set<unsigned long>::iterator it = selectedTracks.begin(); it != selectedTracks.end(); it++) {
      DTSC::Track & thisTrack = myMeta.tracks[*it];
      MP4::TRAK trakBox;
      //Keep track of the current index within the moovBox
      unsigned int trakOffset = 0;

      MP4::TKHD tkhdBox(thisTrack, false);
      trakBox.setContent(tkhdBox, trakOffset++);

      //Create an EDTS box, containing an ELST box with default values;
      ///\todo Figure out if this box is really needed for anything.
      MP4::EDTS edtsBox;
      MP4::ELST elstBox;
      elstBox.setVersion(0);
      elstBox.setFlags(0);
      elstBox.setCount(1);
      elstBox.setSegmentDuration(thisTrack.lastms - thisTrack.firstms);
      elstBox.setMediaTime(0);
      elstBox.setMediaRateInteger(1);
      elstBox.setMediaRateFraction(0);
      edtsBox.setContent(elstBox, 0);
      trakBox.setContent(edtsBox, trakOffset++);

      MP4::MDIA mdiaBox;
      unsigned int mdiaOffset = 0;
      
      //Add the mandatory MDHD and HDLR boxes to the MDIA
      MP4::MDHD mdhdBox(thisTrack.lastms - thisTrack.firstms);
      mdhdBox.setLanguage(thisTrack.lang);
      mdiaBox.setContent(mdhdBox, mdiaOffset++);
      MP4::HDLR hdlrBox(thisTrack.type, thisTrack.getIdentifier());
      mdiaBox.setContent(hdlrBox, mdiaOffset++);
      
      MP4::MINF minfBox;
      unsigned int minfOffset = 0;
      
      //Add a track-type specific box to the MINF box
      if (thisTrack.type == "video") {
        MP4::VMHD vmhdBox;
        vmhdBox.setFlags(1);
        minfBox.setContent(vmhdBox, minfOffset++);
      } else if (thisTrack.type == "audio") {
        MP4::SMHD smhdBox;
        minfBox.setContent(smhdBox, minfOffset++);
      }

      //Add the mandatory DREF (dataReference) box
      MP4::DINF dinfBox;
      MP4::DREF drefBox;
      dinfBox.setContent(drefBox, 0);
      minfBox.setContent(dinfBox, minfOffset++);


     
      MP4::STBL stblBox;
      unsigned int stblOffset = 0;

      //Add STSD box
      MP4::STSD stsdBox(0);
      if (thisTrack.type == "video") {
        MP4::VisualSampleEntry sampleEntry(thisTrack);
        stsdBox.setEntry(sampleEntry, 0);
      } else if (thisTrack.type == "audio") {
        MP4::AudioSampleEntry sampleEntry(thisTrack);
        stsdBox.setEntry(sampleEntry, 0);
      }
      stblBox.setContent(stsdBox, stblOffset++);

      //Add STTS Box
      MP4::STTS sttsBox(0);
      std::deque<std::pair<int, int> > sttsCounter;
      for (unsigned int part = 0; part < thisTrack.parts.size(); ++part) {
        //Create a new entry with current duration if EITHER there is no entry yet, or this parts duration differs from the previous
        if (!sttsCounter.size() || sttsCounter.rbegin()->second != thisTrack.parts[part].getDuration()){
          //Set the counter to 0, so we don't have to handle this situation diffent when updating
          sttsCounter.push_back(std::pair<int,int>(0, thisTrack.parts[part].getDuration()));
        }
        //Then update the counter
        sttsCounter.rbegin()->first++;
      }

      //Write all entries in reverse
      for (unsigned int entry = sttsCounter.size(); entry > 0; --entry){
        MP4::STTSEntry newEntry;
        newEntry.sampleCount = sttsCounter[entry - 1].first;;
        newEntry.sampleDelta = sttsCounter[entry - 1].second;
        sttsBox.setSTTSEntry(newEntry, entry - 1);///\todo rewrite for sanity
      }
      stblBox.setContent(sttsBox, stblOffset++);
     
      //Add STSS Box IF type is video and we are not fragmented
      if (thisTrack.type == "video") {
        MP4::STSS stssBox(0);
        int tmpCount = 0;
        for (int i = 0; i < thisTrack.keys.size(); i++){
          stssBox.setSampleNumber(tmpCount + 1, i);///\todo PLEASE rewrite this for sanity.... SHOULD be: index FIRST, value SECOND
          tmpCount += thisTrack.keys[i].getParts();
        }
        stblBox.setContent(stssBox, stblOffset++);
      }

      //Add STSC Box
      MP4::STSC stscBox(0);
      MP4::STSCEntry stscEntry(1,1,1);
      stscBox.setSTSCEntry(stscEntry, 0);
      stblBox.setContent(stscBox, stblOffset++);

      bool containsOffsets = false;

      //Add STSZ Box
      MP4::STSZ stszBox(0);
      if (thisTrack.parts.size()) {
        std::deque<DTSC::Part>::reverse_iterator tmpIt = thisTrack.parts.rbegin();
        for (unsigned int part = thisTrack.parts.size(); part > 0; --part) {
          ///\todo rewrite for sanity
          stszBox.setEntrySize(tmpIt->getSize(), part - 1); //in bytes in file
          size += tmpIt->getSize();
          containsOffsets |= tmpIt->getOffset();
          tmpIt++;
        }
      }
      stblBox.setContent(stszBox, stblOffset++);
      
      //Add CTTS Box only if the track contains time offsets
      if (containsOffsets) {
        MP4::CTTS cttsBox;
        cttsBox.setVersion(0);

        MP4::CTTSEntry tmpEntry;
        tmpEntry.sampleCount = 0;
        tmpEntry.sampleOffset = thisTrack.parts[0].getOffset();
        unsigned int totalEntries = 0;
        for (std::deque<DTSC::Part>::iterator tmpIt = thisTrack.parts.begin(); tmpIt != thisTrack.parts.end(); tmpIt++){
          if (tmpIt->getOffset() != tmpEntry.sampleOffset) {
            //If the offset of this and previous part differ, write current values and reset
            cttsBox.setCTTSEntry(tmpEntry, totalEntries++);///\todo Again, rewrite for sanity. index FIRST, value SECOND
            tmpEntry.sampleCount = 0;
            tmpEntry.sampleOffset = tmpIt->getOffset();
          }
          tmpEntry.sampleCount++;
        }
        //set the last entry
        cttsBox.setCTTSEntry(tmpEntry, totalEntries++);
        stblBox.setContent(cttsBox, stblOffset++);
      }


     
      //Create STCO Box (either stco or co64)
      //note: Inserting empty values on purpose here, will be fixed later.
      if (useLargeBoxes) {
        MP4::CO64 CO64Box;
        CO64Box.setChunkOffset(0, thisTrack.parts.size() - 1);
        stblBox.setContent(CO64Box, stblOffset++);
      } else {
        MP4::STCO stcoBox(0);
        stcoBox.setChunkOffset(0, thisTrack.parts.size() - 1);
        stblBox.setContent(stcoBox, stblOffset++);
      }
      
      minfBox.setContent(stblBox, minfOffset++);
      
      mdiaBox.setContent(minfBox, mdiaOffset++);
      
      trakBox.setContent(mdiaBox, 2);

      moovBox.setContent(trakBox, moovOffset++);
    }
    //initial offset length ftyp, length moov + 8
      unsigned long long int dataOffset = ftypBox.boxedSize() + moovBox.boxedSize() + 8;
    //update all STCO or CO64 from the following maps;
    std::map <long unsigned, MP4::STCO> checkStcoBoxes;
    std::map <long unsigned, MP4::CO64> checkCO64Boxes;
    //for all tracks
    for (unsigned int i = 1; i < moovBox.getContentCount(); i++){
      //10 lines to get the STCO box.
      MP4::TRAK checkTrakBox;
      MP4::Box checkMdiaBox;
      MP4::Box checkTkhdBox;
      MP4::MINF checkMinfBox;
      MP4::STBL checkStblBox;
      //MP4::STCO checkStcoBox;
      checkTrakBox = ((MP4::TRAK&)moovBox.getContent(i));
      for (unsigned int j = 0; j < checkTrakBox.getContentCount(); j++){
        if (checkTrakBox.getContent(j).isType("mdia")){
          checkMdiaBox = checkTrakBox.getContent(j);
          break;
        }
        if (checkTrakBox.getContent(j).isType("tkhd")){
          checkTkhdBox = checkTrakBox.getContent(j);
        }
      }
      for (unsigned int j = 0; j < ((MP4::MDIA&)checkMdiaBox).getContentCount(); j++){
        if (((MP4::MDIA&)checkMdiaBox).getContent(j).isType("minf")){
          checkMinfBox = ((MP4::MINF&)((MP4::MDIA&)checkMdiaBox).getContent(j));
          break;
        }
      }
      for (unsigned int j = 0; j < checkMinfBox.getContentCount(); j++){
        if (checkMinfBox.getContent(j).isType("stbl")){
          checkStblBox = ((MP4::STBL&)checkMinfBox.getContent(j));
          break;
        }
      }
      for (unsigned int j = 0; j < checkStblBox.getContentCount(); j++){
        if (checkStblBox.getContent(j).isType("stco")){
          checkStcoBoxes.insert( std::pair<long unsigned, MP4::STCO>(((MP4::TKHD&)checkTkhdBox).getTrackID(), ((MP4::STCO&)checkStblBox.getContent(j)) ));
          break;
        }
        if (checkStblBox.getContent(j).isType("co64")){
          checkCO64Boxes.insert( std::pair<long unsigned, MP4::CO64>(((MP4::TKHD&)checkTkhdBox).getTrackID(), ((MP4::CO64&)checkStblBox.getContent(j)) ));
          break;
        }
      }
    }
    //inserting right values in the STCO box header
    //total = 0;
      //Keep track of the current size of the data within the mdat
      long long unsigned int dataSize = 0;
    //Current values are actual byte offset without header-sized offset
    std::set <keyPart> sortSet;//filling sortset for interleaving parts
    for (std::set<long unsigned int>::iterator subIt = selectedTracks.begin(); subIt != selectedTracks.end(); subIt++) {
      keyPart temp;
      temp.trackID = *subIt;
      temp.time = myMeta.tracks[*subIt].firstms;//timeplace of frame
      temp.endTime = myMeta.tracks[*subIt].firstms + myMeta.tracks[*subIt].parts[0].getDuration();
      temp.size = myMeta.tracks[*subIt].parts[0].getSize();//bytesize of frame (alle parts all together)
      temp.index = 0;
        INFO_MSG("adding to sortSet: tid %lu time %llu", temp.trackID, temp.time);
      sortSet.insert(temp);
    }
    while (!sortSet.empty()){
      std::set<keyPart>::iterator keyBegin = sortSet.begin();
      //setting the right STCO size in the STCO box
      if (useLargeBoxes){//Re-using the previously defined boolean for speedup
        checkCO64Boxes[keyBegin->trackID].setChunkOffset(dataOffset + dataSize, keyBegin->index);
      } else {
        checkStcoBoxes[keyBegin->trackID].setChunkOffset(dataOffset + dataSize, keyBegin->index);
      }
      dataSize += keyBegin->size;
      
      //add next keyPart to sortSet
      DTSC::Track & thisTrack = myMeta.tracks[keyBegin->trackID];
      if (keyBegin->index < thisTrack.parts.size() - 1) {//Only create new element, when there are new elements to be added 
        keyPart temp = *keyBegin;
        temp.index ++;
        temp.time = temp.endTime;
        temp.endTime += thisTrack.parts[temp.index].getDuration();
        temp.size = thisTrack.parts[temp.index].getSize();//bytesize of frame
        sortSet.insert(temp);
      }
      //remove highest keyPart
      sortSet.erase(keyBegin);
    }

    ///\todo Update this thing for boxes >4G?
    mdatSize = dataSize + 8;//+8 for mp4 header
    
    header << std::string(moovBox.asBox(), moovBox.boxedSize());
    
    char mdatHeader[8] = {0x00,0x00,0x00,0x00,'m','d','a','t'};
    Bit::htobl(mdatHeader, mdatSize);
    header.write(mdatHeader, 8);
    
    size += header.str().size();
    return header.str();
  }
  
  /// Calculate a seekPoint, based on byteStart, metadata, tracks and headerSize.
  /// The seekPoint will be set to the timestamp of the first packet to send.
  void OutProgressiveMP4::findSeekPoint(long long byteStart, long long & seekPoint, unsigned int headerSize){
    seekPoint = 0;
    //if we're starting in the header, seekPoint is always zero.
    if (byteStart <= headerSize) {
      return;
    }
    //okay, we're past the header. Substract the headersize from the starting postion.
    byteStart -= headerSize;
    //forward through the file by headers, until we reach the point where we need to be
    while (!sortSet.empty()){
      //record where we are
      seekPoint = sortSet.begin()->time;
      //substract the size of this fragment from byteStart
      byteStart -= sortSet.begin()->size;
      //if that put us past the point where we wanted to be, return right now
      if (byteStart < 0) {
        INFO_MSG("We're starting at time %lld, skipping %lld bytes", seekPoint, byteStart+sortSet.begin()->size);
        return;
      }
      //otherwise, set currPos to where we are now and continue
      currPos += sortSet.begin()->size;
      //find the next part
      keyPart temp;
      temp.index = sortSet.begin()->index + 1;
      temp.trackID = sortSet.begin()->trackID;
      if(temp.index < myMeta.tracks[temp.trackID].parts.size() ){//only insert when there are parts left
        temp.time = sortSet.begin()->endTime;//timeplace of frame
        temp.endTime = sortSet.begin()->endTime + myMeta.tracks[temp.trackID].parts[temp.index].getDuration();
        temp.size = myMeta.tracks[temp.trackID].parts[temp.index].getSize();//bytesize of frame 
        sortSet.insert(temp);
      }
      //remove highest keyPart
      sortSet.erase(sortSet.begin());
      //wash, rinse, repeat
    }
    //If we're here, we're in the last fragment.
    //That's technically legal, of course.
  }
  
  /// Parses a "Range: " header, setting byteStart, byteEnd and seekPoint using data from metadata and tracks to do
  /// the calculations.
  /// On error, byteEnd is set to zero.
  void OutProgressiveMP4::parseRange(std::string header, long long & byteStart, long long & byteEnd, long long & seekPoint, unsigned int headerSize){
    if (header.size() < 6 || header.substr(0, 6) != "bytes="){
      byteEnd = 0;
      DEBUG_MSG(DLVL_WARN, "Invalid range header: %s", header.c_str());
      return;
    }
    header.erase(0, 6);
    if (header.size() && header[0] == '-'){
      //negative range = count from end
      byteStart = 0;
      for (unsigned int i = 1; i < header.size(); ++i){
        if (header[i] >= '0' && header[i] <= '9'){
          byteStart *= 10;
          byteStart += header[i] - '0';
          continue;
        }
        break;
      }
      if (byteStart > byteEnd){
        //entire file if starting before byte zero
        byteStart = 0;
        findSeekPoint(byteStart, seekPoint, headerSize);
        return;
      }else{
        //start byteStart bytes before byteEnd
        byteStart = byteEnd - byteStart;
        findSeekPoint(byteStart, seekPoint, headerSize);
        return;
      }
    }else{
      long long size = byteEnd;
      byteEnd = 0;
      byteStart = 0;
      unsigned int i = 0;
      for ( ; i < header.size(); ++i){
        if (header[i] >= '0' && header[i] <= '9'){
          byteStart *= 10;
          byteStart += header[i] - '0';
          continue;
        }
        break;
      }
      if (header[i] != '-'){
        DEBUG_MSG(DLVL_WARN, "Invalid range header: %s", header.c_str());
        byteEnd = 0;
        return;
      }
      ++i;
      if (i < header.size()){
        for ( ; i < header.size(); ++i){
          if (header[i] >= '0' && header[i] <= '9'){
            byteEnd *= 10;
            byteEnd += header[i] - '0';
            continue;
          }
          break;
        }
        if (byteEnd > size - 1) {
          byteEnd = size - 1;
        }
      }else{
        byteEnd = size;
      }
      DEBUG_MSG(DLVL_MEDIUM, "Range request: %lli-%lli (%s)", byteStart, byteEnd, header.c_str());
      findSeekPoint(byteStart, seekPoint, headerSize);
      return;
    }
  }
  void OutProgressiveMP4::onHTTP(){
    if(H.method == "OPTIONS" || H.method == "HEAD"){
      H.Clean();
      H.setCORSHeaders();
      H.SetHeader("Content-Type", "video/MP4");
      H.SetHeader("Accept-Ranges", "bytes, parsec");
      H.SendResponse("200", "OK", myConn);
      return;
    }

    //Always initialize before anything else
    initialize();
    
    //Make sure we start receiving data after this function
    ///\todo Should this happen here?
    parseData = true;
    wantRequest = false;
    sentHeader = false;
    
    //For storing the header.
    ///\todo Do we really need this though?
    std::string headerData = DTSCMeta2MP4Header(fileSize);

    seekPoint = 0;
    byteStart = 0;
    byteEnd = fileSize - 1;
    char rangeType = ' ';
    currPos = 0;
    sortSet.clear();
    for (std::set<long unsigned int>::iterator subIt = selectedTracks.begin(); subIt != selectedTracks.end(); subIt++) {
      keyPart temp;
      temp.trackID = *subIt;
      temp.time = myMeta.tracks[*subIt].firstms;//timeplace of frame
      temp.endTime = myMeta.tracks[*subIt].firstms + myMeta.tracks[*subIt].parts[0].getDuration();
      temp.size = myMeta.tracks[*subIt].parts[0].getSize();//bytesize of frame (alle parts all together)
      temp.index = 0;
      sortSet.insert(temp);
    }
    if (H.GetHeader("Range") != ""){
      parseRange(H.GetHeader("Range"), byteStart, byteEnd, seekPoint, headerData.size());
      rangeType = H.GetHeader("Range")[0];
    }
    H.Clean(); //make sure no parts of old requests are left in any buffers
    H.setCORSHeaders();
    H.SetHeader("Content-Type", "video/MP4"); //Send the correct content-type for MP4 files
    H.SetHeader("Accept-Ranges", "bytes, parsec");
    if (rangeType != ' '){
      if (!byteEnd){
        if (rangeType == 'p'){
          H.SetBody("Starsystem not in communications range");
          H.SendResponse("416", "Starsystem not in communications range", myConn);
          return;
        }else{
          H.SetBody("Requested Range Not Satisfiable");
          H.SendResponse("416", "Requested Range Not Satisfiable", myConn);
          return;
        }
      }else{
        std::stringstream rangeReply;
        rangeReply << "bytes " << byteStart << "-" << byteEnd << "/" << fileSize;
        H.SetHeader("Content-Length", byteEnd - byteStart + 1);
        //do not multiplex requests that are > 1MiB
        if (byteEnd - byteStart + 1 > 1024*1024){
          H.SetHeader("MistMultiplex", "No");
        }
        H.SetHeader("Content-Range", rangeReply.str());
        /// \todo Switch to chunked?
        H.SendResponse("206", "Partial content", myConn);
        //H.StartResponse("206", "Partial content", HTTP_R, conn);
      }
    }else{
      H.SetHeader("Content-Length", byteEnd - byteStart + 1);
      //do not multiplex requests that aren't ranged
      H.SetHeader("MistMultiplex", "No");
      /// \todo Switch to chunked?
      H.SendResponse("200", "OK", myConn);
      //HTTP_S.StartResponse(HTTP_R, conn);
    }
    leftOver = byteEnd - byteStart + 1;//add one byte, because range "0-0" = 1 byte of data
    if (byteStart < (long long)headerData.size()){
      /// \todo Switch to chunked?
      myConn.SendNow(headerData.data()+byteStart, std::min((long long)headerData.size(), byteEnd) - byteStart);//send MP4 header
      leftOver -= std::min((long long)headerData.size(), byteEnd) - byteStart;
    }
    currPos += headerData.size();//we're now guaranteed to be past the header point, no matter what
  }
  
  void OutProgressiveMP4::sendNext(){
    static bool perfect = true;
    
    //Obtain a pointer to the data of this packet
    char * dataPointer = 0;
    unsigned int len = 0;
    thisPacket.getString("data", dataPointer, len);
    if ((unsigned long)thisPacket.getTrackId() != sortSet.begin()->trackID || thisPacket.getTime() != sortSet.begin()->time){
      if (thisPacket.getTime() > sortSet.begin()->time || (unsigned long)thisPacket.getTrackId() > sortSet.begin()->trackID) {
        if (perfect){
          DEBUG_MSG(DLVL_WARN, "Warning: input is inconsistent. Expected %lu:%llu but got %ld:%llu - cancelling playback", sortSet.begin()->trackID, sortSet.begin()->time, thisPacket.getTrackId(), thisPacket.getTime());
          perfect = false;
          myConn.close();
        }
      }else{
        DEBUG_MSG(DLVL_HIGH, "Did not receive expected %lu:%llu but got %ld:%llu - throwing it away", sortSet.begin()->trackID, sortSet.begin()->time, thisPacket.getTrackId(), thisPacket.getTime());
      }
      return;
    }

    if (currPos >= byteStart) {
      myConn.SendNow(dataPointer, std::min(leftOver, (long long)len));
      leftOver -= len;
    } else {
      if (currPos + (long long)len > byteStart) {
        myConn.SendNow(dataPointer + (byteStart - currPos), std::min(leftOver, (long long)(len - (byteStart - currPos))));
        leftOver -= len - (byteStart - currPos);
      }
    }

    //keep track of where we are
    if (!sortSet.empty()){
      keyPart temp;
      temp.index = sortSet.begin()->index + 1;
      temp.trackID = sortSet.begin()->trackID;
      if(temp.index < myMeta.tracks[temp.trackID].parts.size() ){//only insert when there are parts left
        temp.time = sortSet.begin()->endTime;//timeplace of frame
        temp.endTime = sortSet.begin()->endTime + myMeta.tracks[temp.trackID].parts[temp.index].getDuration();
        temp.size = myMeta.tracks[temp.trackID].parts[temp.index].getSize();//bytesize of frame 
        sortSet.insert(temp);
      }
      currPos += sortSet.begin()->size;
      //remove highest keyPart
      sortSet.erase(sortSet.begin());
    }
    
    

    if (leftOver < 1){

      //stop playback, wait for new request
      stop();
      wantRequest = true;
    }
  }

  void OutProgressiveMP4::sendHeader(){
    seek(seekPoint);
    sentHeader = true;
  }
  
}