#include "mp4.h"
#include <sstream>
namespace MP4{
bool keyPartSort(keyPart i, keyPart j){
return (i.time < j.time);
}
std::string DTSC2MP4Converter::DTSCMeta2MP4Header(JSON::Value metaData){
std::stringstream header;
//ftyp box
/// \todo fill ftyp with non hardcoded values from file
MP4::FTYP ftypBox;
ftypBox.setMajorBrand(0x6D703431);//mp41
ftypBox.setMinorVersion(0);
ftypBox.setCompatibleBrands(0x69736f6d,0);
ftypBox.setCompatibleBrands(0x69736f32,1);
ftypBox.setCompatibleBrands(0x61766331,2);
ftypBox.setCompatibleBrands(0x6D703431,3);
header << std::string(ftypBox.asBox(),ftypBox.boxedSize());
uint64_t mdatSize = 0;
//std::vector<uint64_t> stcoOffsets;
//moov box
MP4::MOOV moovBox;
MP4::MVHD mvhdBox;
mvhdBox.setVersion(0);
mvhdBox.setCreationTime(0);
mvhdBox.setModificationTime(0);
mvhdBox.setTimeScale(1000);
mvhdBox.setRate(0x10000);
mvhdBox.setDuration(metaData["lastms"].asInt() + metaData["firstms"].asInt());
mvhdBox.setTrackID(0);
mvhdBox.setVolume(256);
mvhdBox.setMatrix(0x00010000,0);
mvhdBox.setMatrix(0,1);
mvhdBox.setMatrix(0,2);
mvhdBox.setMatrix(0,3);
mvhdBox.setMatrix(0x00010000,4);
mvhdBox.setMatrix(0,5);
mvhdBox.setMatrix(0,6);
mvhdBox.setMatrix(0,7);
mvhdBox.setMatrix(0x40000000,8);
moovBox.setContent(mvhdBox, 0);
//calculate interleaving
//putting all metadata in a huge vector 'keyParts'
keyParts.clear();
for (JSON::ObjIter trackIt = metaData["tracks"].ObjBegin(); trackIt != metaData["tracks"].ObjEnd(); trackIt++){
for (JSON::ArrIter keyIt = trackIt->second["keys"].ArrBegin(); keyIt != trackIt->second["keys"].ArrEnd(); keyIt++){
keyPart temp;
temp.trackID = trackIt->second["trackid"].asInt();
temp.size = (*keyIt)["size"].asInt();
temp.time = (*keyIt)["time"].asInt();
temp.len = (*keyIt)["len"].asInt();
temp.parts = (*keyIt)["parts"];
keyParts.push_back(temp);
}
}
//sort by time on keyframes for interleaving
std::sort(keyParts.begin(), keyParts.end(), keyPartSort);
//start arbitrary track addition for header
int boxOffset = 1;
for (JSON::ObjIter it = metaData["tracks"].ObjBegin(); it != metaData["tracks"].ObjEnd(); it++){
int timescale = 0;
MP4::TRAK trakBox;
MP4::TKHD tkhdBox;
//std::cerr << it->second["trackid"].asInt() << std::endl;
tkhdBox.setVersion(0);
tkhdBox.setFlags(15);
tkhdBox.setTrackID(it->second["trackid"].asInt());
tkhdBox.setDuration(it->second["lastms"].asInt() + it->second["firsms"].asInt());
if (it->second["type"].asString() == "video"){
tkhdBox.setWidth(it->second["width"].asInt() << 16);
tkhdBox.setHeight(it->second["height"].asInt() << 16);
tkhdBox.setVolume(0);
}else{
tkhdBox.setVolume(256);
tkhdBox.setAlternateGroup(1);
}
tkhdBox.setMatrix(0x00010000,0);
tkhdBox.setMatrix(0,1);
tkhdBox.setMatrix(0,2);
tkhdBox.setMatrix(0,3);
tkhdBox.setMatrix(0x00010000,4);
tkhdBox.setMatrix(0,5);
tkhdBox.setMatrix(0,6);
tkhdBox.setMatrix(0,7);
tkhdBox.setMatrix(0x40000000,8);
trakBox.setContent(tkhdBox, 0);
MP4::MDIA mdiaBox;
MP4::MDHD mdhdBox(0);/// \todo fix constructor mdhd in lib
mdhdBox.setCreationTime(0);
mdhdBox.setModificationTime(0);
//Calculating media time based on sampledelta. Probably cheating, but it works...
int tmpParts = 0;
for (JSON::ArrIter tmpIt = it->second["keys"].ArrBegin(); tmpIt != it->second["keys"].ArrEnd(); tmpIt++){
tmpParts += (*tmpIt)["parts"].size();
}
timescale = ((double)(42 * tmpParts) / (it->second["lastms"].asInt() + it->second["firstms"].asInt())) * 1000;
mdhdBox.setTimeScale(timescale);
mdhdBox.setDuration(((it->second["lastms"].asInt() + it->second["firsms"].asInt()) * ((double)timescale / 1000)));
mdiaBox.setContent(mdhdBox, 0);
std::string tmpStr = it->second["type"].asString();
MP4::HDLR hdlrBox;/// \todo fix constructor hdlr in lib
if (tmpStr == "video"){
hdlrBox.setHandlerType(0x76696465);//vide
}else if (tmpStr == "audio"){
hdlrBox.setHandlerType(0x736F756E);//soun
}
hdlrBox.setName(it->first);
mdiaBox.setContent(hdlrBox, 1);
MP4::MINF minfBox;
if (tmpStr == "video"){
MP4::VMHD vmhdBox;
vmhdBox.setFlags(1);
minfBox.setContent(vmhdBox,0);
}else if (tmpStr == "audio"){
MP4::SMHD smhdBox;
minfBox.setContent(smhdBox,0);
}
MP4::DINF dinfBox;
MP4::DREF drefBox;/// \todo fix constructor dref in lib
drefBox.setVersion(0);
MP4::URL urlBox;
urlBox.setFlags(1);
drefBox.setDataEntry(urlBox,0);
dinfBox.setContent(drefBox,0);
minfBox.setContent(dinfBox,1);
MP4::STBL stblBox;
MP4::STSD stsdBox;
stsdBox.setVersion(0);
if (tmpStr == "video"){//boxname = codec
MP4::VisualSampleEntry vse;
std::string tmpStr2 = it->second["codec"];
if (tmpStr2 == "H264"){
vse.setCodec("avc1");
}
vse.setDataReferenceIndex(1);
vse.setWidth(it->second["width"].asInt());
vse.setHeight(it->second["height"].asInt());
MP4::AVCC avccBox;
avccBox.setPayload(it->second["init"].asString());
vse.setCLAP(avccBox);
stsdBox.setEntry(vse,0);
}else if(tmpStr == "audio"){//boxname = codec
MP4::AudioSampleEntry ase;
std::string tmpStr2 = it->second["codec"];
if (tmpStr2 == "AAC"){
ase.setCodec("mp4a");
ase.setDataReferenceIndex(1);
}
ase.setSampleRate(it->second["rate"].asInt());
ase.setChannelCount(it->second["channels"].asInt());
ase.setSampleSize(it->second["size"].asInt());
MP4::ESDS esdsBox;
esdsBox.setESDescriptorTypeLength(32+it->second["init"].asString().size());
esdsBox.setESID(2);
esdsBox.setStreamPriority(0);
esdsBox.setDecoderConfigDescriptorTypeLength(18+it->second["init"].asString().size());
esdsBox.setByteObjectTypeID(0x40);
esdsBox.setStreamType(5);
esdsBox.setReservedFlag(1);
esdsBox.setBufferSize(1250000);
esdsBox.setMaximumBitRate(10000000);
esdsBox.setAverageBitRate(it->second["bps"].asInt() * 8);
esdsBox.setConfigDescriptorTypeLength(5);
esdsBox.setESHeaderStartCodes(it->second["init"].asString());
esdsBox.setSLConfigDescriptorTypeTag(0x6);
esdsBox.setSLConfigExtendedDescriptorTypeTag(0x808080);
esdsBox.setSLDescriptorTypeLength(1);
esdsBox.setSLValue(2);
ase.setCodecBox(esdsBox);
stsdBox.setEntry(ase,0);
}
stblBox.setContent(stsdBox,0);
/// \todo update following stts lines
MP4::STTS sttsBox;//current version probably causes problems
sttsBox.setVersion(0);
MP4::STTSEntry newEntry;
newEntry.sampleCount = tmpParts;
//42, because of reasons.
newEntry.sampleDelta = 42;
sttsBox.setSTTSEntry(newEntry, 0);
stblBox.setContent(sttsBox,1);
if (it->second["type"] == "video"){
//STSS Box here
MP4::STSS stssBox;
stssBox.setVersion(0);
int tmpCount = 1;
for (int i = 0; i < it->second["keys"].size(); i++){
stssBox.setSampleNumber(tmpCount,i);
tmpCount += it->second["keys"][i]["parts"].size();
}
stblBox.setContent(stssBox,2);
}
int offset = (it->second["type"] == "video");
MP4::STSC stscBox;
stscBox.setVersion(0);
uint32_t total = 0;
MP4::STSCEntry stscEntry;
stscEntry.firstChunk = 1;
stscEntry.samplesPerChunk = 1;
stscEntry.sampleDescriptionIndex = 1;
stscBox.setSTSCEntry(stscEntry, 0);
stblBox.setContent(stscBox,2 + offset);
MP4::STSZ stszBox;
stszBox.setVersion(0);
total = 0;
for (int i = 0; i < it->second["keys"].size(); i++){
for (int o = 0; o < it->second["keys"][i]["parts"].size(); o++){
stszBox.setEntrySize(it->second["keys"][i]["parts"][o].asInt(), total);//in bytes in file
total++;
}
}
stblBox.setContent(stszBox,3 + offset);
MP4::STCO stcoBox;
stcoBox.setVersion(1);
total = 0;
uint64_t totalByteOffset = 0;
//Inserting wrong values on purpose here, will be fixed later.
//Current values are actual byte offset without header-sized offset
for (unsigned int i = 0; i < keyParts.size(); i++){//for all keypart size
if(keyParts[i].trackID == it->second["trackid"].asInt()){//if keypart is of current trackID
for (unsigned int o = 0; o < keyParts[i].parts.size(); o++){//add all parts to STCO
stcoBox.setChunkOffset(totalByteOffset, total);
total++;
totalByteOffset += keyParts[i].parts[o].asInt();
}
}else{
totalByteOffset += keyParts[i].size;
}
}
//calculating the offset where the STCO box will be in the main MOOV box
//needed for probable optimise
/*stcoOffsets.push_back(
moovBox.payloadSize() +
trakBox.boxedSize() +
mdiaBox.boxedSize() +
minfBox.boxedSize() +
stblBox.boxedSize()
);*/
mdatSize = totalByteOffset;
stblBox.setContent(stcoBox,4 + offset);
minfBox.setContent(stblBox,2);
mdiaBox.setContent(minfBox, 2);
trakBox.setContent(mdiaBox, 1);
moovBox.setContent(trakBox, boxOffset);
boxOffset++;
}
//end arbitrary
//initial offset length ftyp, length moov + 8
unsigned long long int byteOffset = ftypBox.boxedSize() + moovBox.boxedSize() + 8;
//update all STCO
//std::map <int, MP4::STCO&> STCOFix;
//for tracks
for (unsigned int i = 1; i < moovBox.getContentCount(); i++){
//10 lines to get the STCO box.
MP4::TRAK checkTrakBox;
MP4::MDIA checkMdiaBox;
MP4::MINF checkMinfBox;
MP4::STBL checkStblBox;
MP4::STCO checkStcoBox;
checkTrakBox = ((MP4::TRAK&)moovBox.getContent(i));
for (int j = 0; j < checkTrakBox.getContentCount(); j++){
if (checkTrakBox.getContent(j).isType("mdia")){
checkMdiaBox = ((MP4::MDIA&)checkTrakBox.getContent(j));
break;
}
}
for (int j = 0; j < checkMdiaBox.getContentCount(); j++){
if (checkMdiaBox.getContent(j).isType("minf")){
checkMinfBox = ((MP4::MINF&)checkMdiaBox.getContent(j));
break;
}
}
for (int j = 0; j < checkMinfBox.getContentCount(); j++){
if (checkMinfBox.getContent(j).isType("stbl")){
checkStblBox = ((MP4::STBL&)checkMinfBox.getContent(j));
break;
}
}
for (int j = 0; j < checkStblBox.getContentCount(); j++){
if (checkStblBox.getContent(j).isType("stco")){
//STCOFix.insert( std::pair<int, MP4::STCO&>(((MP4::TKHD&)(checkTrakBox.getContent(0))).getTrackID(),(MP4::STCO&)(checkStblBox.getContent(j))));
checkStcoBox = ((MP4::STCO&)checkStblBox.getContent(j));
break;
}
}
/*MP4::Box temp = MP4::Box((moovBox.payload()+stcoOffsets[i]),false);
MP4::STCO & checkStcoBox = *((MP4::STCO*)(&temp));
std::cerr << checkStcoBox.toPrettyString() << std::endl;*/
//got the STCO box, fixing values with MP4 header offset
for (int j = 0; j < checkStcoBox.getEntryCount(); j++){
checkStcoBox.setChunkOffset(checkStcoBox.getChunkOffset(j) + byteOffset, j);
}
}
header << std::string(moovBox.asBox(),moovBox.boxedSize());
//printf("%c%c%c%cmdat", (mdatSize>>24) & 0x000000FF,(mdatSize>>16) & 0x000000FF,(mdatSize>>8) & 0x000000FF,mdatSize & 0x000000FF);
header << (char)((mdatSize>>24) & 0x000000FF) << (char)((mdatSize>>16) & 0x000000FF) << (char)((mdatSize>>8) & 0x000000FF) << (char)(mdatSize & 0x000000FF) << "mdat";
//std::cerr << "Header Written" << std::endl;
//end of header
std::map <long long unsigned int, std::deque<JSON::Value> > trackBuffer;
long long unsigned int curKey = 0;//the key chunk we are currently searching for in keyParts
long long unsigned int curPart = 0;//current part in current key
return header.str();
}
void DTSC2MP4Converter::parseDTSC(JSON::Value mediaPart){
//mdat output here
//output cleanout buffer first
//while there are requested packets in the trackBuffer:...
while (!trackBuffer[keyParts[curKey].trackID].empty()){
//output requested packages
if(keyParts[curKey].parts[curPart].asInt() != trackBuffer[keyParts[curKey].trackID].front()["data"].asString().size()){
std::cerr << "Size discrepancy in buffer packet. Size: " << mediaPart["data"].asString().size() << " Expected:" << keyParts[curKey].parts[curPart].asInt() << std::endl;
}
stringBuffer += trackBuffer[keyParts[curKey].trackID].front()["data"].asString();
trackBuffer[keyParts[curKey].trackID].pop_front();
curPart++;
if(curPart >= keyParts[curKey].parts.size()){
curPart = 0;
curKey++;
}
}
//after that, try to put out the JSON data directly
if(keyParts[curKey].trackID == mediaPart["trackid"].asInt()){
//output JSON packet
if(keyParts[curKey].parts[curPart].asInt() != mediaPart["data"].asString().size()){
std::cerr << "Size discrepancy in JSON packet. Size: " << mediaPart["data"].asString().size() << " Expected:" << keyParts[curKey].parts[curPart].asInt() << std::endl;
}
stringBuffer += mediaPart["data"].asString();
curPart++;
if(curPart >= keyParts[curKey].parts.size()){
curPart = 0;
curKey++;
}
}else{
//buffer for later
trackBuffer[mediaPart["trackid"].asInt()].push_back(mediaPart);
}
}
bool DTSC2MP4Converter::sendReady(){
if (stringBuffer.length() > 0){
return true;
}else{
return false;
}
}
std::string DTSC2MP4Converter::sendString(){
std::string temp = stringBuffer;
stringBuffer = "";
return temp;
}
}