88fa62c19c
MP4 code sanitised Fixed metadata FLV bug Sanitised code MP4 reorganisation in lib MP4 STCO sorting only needs 1 loop now Starting big scope overhaul for memory efficiency
340 lines
14 KiB
C++
340 lines
14 KiB
C++
#include "mp4_generic.h"
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#include <sstream>
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namespace MP4{
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std::string DTSC2MP4Converter::DTSCMeta2MP4Header(DTSC::Meta & metaData){
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std::stringstream header;
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//ftyp box
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/// \todo fill ftyp with non hardcoded values from file
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MP4::FTYP ftypBox;
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ftypBox.setMajorBrand(0x6D703431);//mp41
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ftypBox.setMinorVersion(0);
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ftypBox.setCompatibleBrands(0x69736f6d,0);
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ftypBox.setCompatibleBrands(0x69736f32,1);
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ftypBox.setCompatibleBrands(0x61766331,2);
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ftypBox.setCompatibleBrands(0x6D703431,3);
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header << std::string(ftypBox.asBox(),ftypBox.boxedSize());
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uint64_t mdatSize = 0;
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//moov box
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MP4::MOOV moovBox;{
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//calculating longest duration
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long long int fileDuration = 0;
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/// \todo lastms and firstms fix
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for ( std::map<int,DTSC::Track>::iterator trackIt = metaData.tracks.begin(); trackIt != metaData.tracks.end(); trackIt ++) {
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if (trackIt->second.lastms - trackIt->second.firstms > fileDuration){
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fileDuration = trackIt->second.lastms - trackIt->second.firstms;
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}
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}
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//MP4::MVHD mvhdBox(fileDuration);
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MP4::MVHD mvhdBox;
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mvhdBox.setVersion(0);
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mvhdBox.setCreationTime(0);
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mvhdBox.setModificationTime(0);
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mvhdBox.setTimeScale(1000);
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mvhdBox.setRate(0x10000);
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mvhdBox.setDuration(fileDuration);
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mvhdBox.setTrackID(0);
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mvhdBox.setVolume(256);
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mvhdBox.setMatrix(0x00010000,0);
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mvhdBox.setMatrix(0,1);
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mvhdBox.setMatrix(0,2);
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mvhdBox.setMatrix(0,3);
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mvhdBox.setMatrix(0x00010000,4);
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mvhdBox.setMatrix(0,5);
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mvhdBox.setMatrix(0,6);
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mvhdBox.setMatrix(0,7);
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mvhdBox.setMatrix(0x40000000,8);
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moovBox.setContent(mvhdBox, 0);
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}
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{//start arbitrary track addition for header
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int boxOffset = 1;
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bool seenAudio = false;
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bool seenVideo = false;
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for ( std::map<int,DTSC::Track>::iterator it = metaData.tracks.begin(); it != metaData.tracks.end(); it ++) {
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if (it->second.codec != "AAC" && it->second.codec != "H264"){continue;}
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if (it->second.type == "audio"){
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if (seenAudio){continue;}
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seenAudio = true;
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}
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if (it->second.type == "video"){
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if (seenVideo){continue;}
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seenVideo = true;
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}
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if (it->first > 0){
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int timescale = 0;
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MP4::TRAK trakBox;
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{
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{
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MP4::TKHD tkhdBox;
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tkhdBox.setVersion(0);
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tkhdBox.setFlags(15);
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tkhdBox.setTrackID(it->second.trackID);
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/// \todo duration firstms and lastms fix
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tkhdBox.setDuration(it->second.lastms + it->second.firstms);
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if (it->second.type == "video"){
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tkhdBox.setWidth(it->second.width << 16);
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tkhdBox.setHeight(it->second.height << 16);
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tkhdBox.setVolume(0);
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}else{
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tkhdBox.setVolume(256);
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tkhdBox.setAlternateGroup(1);
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}
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tkhdBox.setMatrix(0x00010000,0);
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tkhdBox.setMatrix(0,1);
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tkhdBox.setMatrix(0,2);
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tkhdBox.setMatrix(0,3);
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tkhdBox.setMatrix(0x00010000,4);
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tkhdBox.setMatrix(0,5);
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tkhdBox.setMatrix(0,6);
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tkhdBox.setMatrix(0,7);
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tkhdBox.setMatrix(0x40000000,8);
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trakBox.setContent(tkhdBox, 0);
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}{
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MP4::MDIA mdiaBox;
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{
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MP4::MDHD mdhdBox(0);/// \todo fix constructor mdhd in lib
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mdhdBox.setCreationTime(0);
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mdhdBox.setModificationTime(0);
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//Calculating media time based on sampledelta. Probably cheating, but it works...
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timescale = ((double)(42 * it->second.parts.size() ) / (it->second.lastms + it->second.firstms)) * 1000;
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mdhdBox.setTimeScale(timescale);
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/// \todo fix lastms, firstms
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mdhdBox.setDuration((it->second.lastms + it->second.firstms) * ((double)timescale / 1000));
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mdiaBox.setContent(mdhdBox, 0);
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}//MDHD box
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{
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MP4::HDLR hdlrBox;/// \todo fix constructor hdlr in lib
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if (it->second.type == "video"){
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hdlrBox.setHandlerType(0x76696465);//vide
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}else if (it->second.type == "audio"){
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hdlrBox.setHandlerType(0x736F756E);//soun
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}
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hdlrBox.setName(it->second.getIdentifier());
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mdiaBox.setContent(hdlrBox, 1);
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}//hdlr box
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{
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MP4::MINF minfBox;
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if (it->second.type== "video"){
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MP4::VMHD vmhdBox;
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vmhdBox.setFlags(1);
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minfBox.setContent(vmhdBox,0);
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}else if (it->second.type == "audio"){
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MP4::SMHD smhdBox;
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minfBox.setContent(smhdBox,0);
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}//type box
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{
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MP4::DINF dinfBox;
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MP4::DREF drefBox;/// \todo fix constructor dref in lib
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drefBox.setVersion(0);
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MP4::URL urlBox;
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urlBox.setFlags(1);
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drefBox.setDataEntry(urlBox,0);
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dinfBox.setContent(drefBox,0);
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minfBox.setContent(dinfBox,1);
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}//dinf box
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{
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MP4::STBL stblBox;
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{
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MP4::STSD stsdBox;
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stsdBox.setVersion(0);
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if (it->second.type == "video"){//boxname = codec
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MP4::VisualSampleEntry vse;
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if (it->second.codec == "H264"){
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vse.setCodec("avc1");
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}
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vse.setDataReferenceIndex(1);
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vse.setWidth(it->second.width);
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vse.setHeight(it->second.height);
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MP4::AVCC avccBox;
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avccBox.setPayload(it->second.init);
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vse.setCLAP(avccBox);
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stsdBox.setEntry(vse,0);
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}else if(it->second.type == "audio"){//boxname = codec
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MP4::AudioSampleEntry ase;
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if (it->second.codec == "AAC"){
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ase.setCodec("mp4a");
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ase.setDataReferenceIndex(1);
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}
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ase.setSampleRate(it->second.rate);
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ase.setChannelCount(it->second.channels);
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ase.setSampleSize(it->second.size);
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//MP4::ESDS esdsBox(it->second.init, it->second.bps);
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MP4::ESDS esdsBox;
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//outputting these values first, so malloc isn't called as often.
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esdsBox.setESHeaderStartCodes(it->second.init);
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esdsBox.setSLValue(2);
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esdsBox.setESDescriptorTypeLength(32+it->second.init.size());
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esdsBox.setESID(2);
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esdsBox.setStreamPriority(0);
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esdsBox.setDecoderConfigDescriptorTypeLength(18 + it->second.init.size());
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esdsBox.setByteObjectTypeID(0x40);
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esdsBox.setStreamType(5);
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esdsBox.setReservedFlag(1);
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esdsBox.setBufferSize(1250000);
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esdsBox.setMaximumBitRate(10000000);
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esdsBox.setAverageBitRate(it->second.bps * 8);
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esdsBox.setConfigDescriptorTypeLength(5);
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esdsBox.setSLConfigDescriptorTypeTag(0x6);
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esdsBox.setSLConfigExtendedDescriptorTypeTag(0x808080);
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esdsBox.setSLDescriptorTypeLength(1);
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ase.setCodecBox(esdsBox);
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stsdBox.setEntry(ase,0);
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}
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stblBox.setContent(stsdBox,0);
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}//stsd box
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/// \todo update following stts lines
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{
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MP4::STTS sttsBox;//current version probably causes problems
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sttsBox.setVersion(0);
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MP4::STTSEntry newEntry;
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newEntry.sampleCount = it->second.parts.size();
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//42, Used as magic number for timescale calculation
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newEntry.sampleDelta = 42;
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sttsBox.setSTTSEntry(newEntry, 0);
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stblBox.setContent(sttsBox,1);
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}//stts box
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if (it->second.type == "video"){
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//STSS Box here
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MP4::STSS stssBox;
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stssBox.setVersion(0);
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int tmpCount = 1;
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int tmpItCount = 0;
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for ( std::deque< DTSC::Key>::iterator tmpIt = it->second.keys.begin(); tmpIt != it->second.keys.end(); tmpIt ++) {
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stssBox.setSampleNumber(tmpCount,tmpItCount);
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tmpCount += tmpIt->getParts();
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tmpItCount ++;
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}
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stblBox.setContent(stssBox,2);
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}//stss box
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int offset = (it->second.type == "video");
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{
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MP4::STSC stscBox;
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stscBox.setVersion(0);
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MP4::STSCEntry stscEntry;
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stscEntry.firstChunk = 1;
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stscEntry.samplesPerChunk = 1;
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stscEntry.sampleDescriptionIndex = 1;
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stscBox.setSTSCEntry(stscEntry, 0);
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stblBox.setContent(stscBox,2 + offset);
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}//stsc box
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{
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uint32_t total = 0;
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MP4::STSZ stszBox;
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stszBox.setVersion(0);
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total = 0;
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for (std::deque< DTSC::Part>::iterator partIt = it->second.parts.begin(); partIt != it->second.parts.end(); partIt ++) {
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stszBox.setEntrySize(partIt->getSize(), total);//in bytes in file
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total++;
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}
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stblBox.setContent(stszBox,3 + offset);
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}//stsz box
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//add STCO boxes here
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{
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MP4::STCO stcoBox;
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stcoBox.setVersion(1);
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//Inserting empty values on purpose here, will be fixed later.
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if (it->second.parts.size() != 0){
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stcoBox.setChunkOffset(0, it->second.parts.size() - 1);//this inserts all empty entries at once
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}
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stblBox.setContent(stcoBox,4 + offset);
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}//stco box
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minfBox.setContent(stblBox,2);
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}//stbl box
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mdiaBox.setContent(minfBox, 2);
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}//minf box
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trakBox.setContent(mdiaBox, 1);
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}
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}//trak Box
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moovBox.setContent(trakBox, boxOffset);
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boxOffset++;
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}
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}
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}//end arbitrary track addition
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//initial offset length ftyp, length moov + 8
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unsigned long long int byteOffset = ftypBox.boxedSize() + moovBox.boxedSize() + 8;
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//update all STCO from the following map;
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std::map <int, MP4::STCO> checkStcoBoxes;
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//for all tracks
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for (unsigned int i = 1; i < moovBox.getContentCount(); i++){
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//10 lines to get the STCO box.
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MP4::TRAK checkTrakBox;
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MP4::MDIA checkMdiaBox;
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MP4::MINF checkMinfBox;
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MP4::STBL checkStblBox;
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//MP4::STCO checkStcoBox;
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checkTrakBox = ((MP4::TRAK&)moovBox.getContent(i));
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for (unsigned int j = 0; j < checkTrakBox.getContentCount(); j++){
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if (checkTrakBox.getContent(j).isType("mdia")){
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checkMdiaBox = ((MP4::MDIA&)checkTrakBox.getContent(j));
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break;
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}
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}
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for (unsigned int j = 0; j < checkMdiaBox.getContentCount(); j++){
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if (checkMdiaBox.getContent(j).isType("minf")){
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checkMinfBox = ((MP4::MINF&)checkMdiaBox.getContent(j));
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break;
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}
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}
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for (unsigned int j = 0; j < checkMinfBox.getContentCount(); j++){
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if (checkMinfBox.getContent(j).isType("stbl")){
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checkStblBox = ((MP4::STBL&)checkMinfBox.getContent(j));
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break;
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}
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}
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for (unsigned int j = 0; j < checkStblBox.getContentCount(); j++){
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if (checkStblBox.getContent(j).isType("stco")){
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checkStcoBoxes.insert( std::pair<int, MP4::STCO>(i, ((MP4::STCO&)checkStblBox.getContent(j)) ));
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break;
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}
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}
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}
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//inserting right values in the STCO box header
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//total = 0;
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long long unsigned int totalByteOffset = 0;
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//Current values are actual byte offset without header-sized offset
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std::set <keyPart> sortSet;//filling sortset for interleaving parts
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for ( std::map<int,DTSC::Track>::iterator subIt = metaData.tracks.begin(); subIt != metaData.tracks.end(); subIt ++) {
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keyPart temp;
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temp.trackID = subIt->second.trackID;
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temp.time = subIt->second.firstms;//timeplace of frame
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temp.endTime = subIt->second.firstms + subIt->second.parts[0].getDuration();
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temp.size = subIt->second.parts[0].getSize();//bytesize of frame (alle parts all together)
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temp.index = 0;
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sortSet.insert(temp);
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}
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while (!sortSet.empty()){
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//setting the right STCO size in the STCO box
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checkStcoBoxes[sortSet.begin()->trackID].setChunkOffset(totalByteOffset + byteOffset, sortSet.begin()->index);
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totalByteOffset += sortSet.begin()->size;
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//add keyPart to sortSet
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keyPart temp;
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temp.index = sortSet.begin()->index + 1;
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temp.trackID = sortSet.begin()->trackID;
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if(temp.index < metaData.tracks[temp.trackID].parts.size() ){//only insert when there are parts left
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temp.time = sortSet.begin()->endTime;//timeplace of frame
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temp.endTime = sortSet.begin()->endTime + metaData.tracks[temp.trackID].parts[temp.index].getDuration();
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temp.size = metaData.tracks[temp.trackID].parts[temp.index].getSize();//bytesize of frame
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sortSet.insert(temp);
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}
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//remove highest keyPart
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sortSet.erase(sortSet.begin());
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}
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//calculating the offset where the STCO box will be in the main MOOV box
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//needed for probable optimise
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mdatSize = totalByteOffset;
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header << std::string(moovBox.asBox(),moovBox.boxedSize());
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header << (char)((mdatSize>>24) & 0x000000FF) << (char)((mdatSize>>16) & 0x000000FF) << (char)((mdatSize>>8) & 0x000000FF) << (char)(mdatSize & 0x000000FF) << "mdat";
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//end of header
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return header.str();
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}
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}
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