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Fixed ELST box in mp4, and use it to fix track desync issues.

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This commit is contained in:
Thulinma 2018-05-16 10:55:46 +02:00
parent ecbb48dbfe
commit 0c41fee7c8
2 changed files with 25 additions and 15 deletions
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28
lib/mp4_generic.cpp
View file

@ -3197,57 +3197,57 @@ namespace MP4 {
void ELST::setSegmentDuration(uint32_t cnt, uint64_t newVal) {
if (getVersion() == 1) {
setInt64(newVal, 28*cnt+8);
setInt64(newVal, 20*cnt+8);
} else {
setInt32(newVal, 20*cnt+8);
setInt32(newVal, 12*cnt+8);
}
}
uint64_t ELST::getSegmentDuration(uint32_t cnt) {
if (getVersion() == 1) {
return getInt64(28*cnt+8);
return getInt64(20*cnt+8);
} else {
return getInt32(20*cnt+8);
return getInt32(12*cnt+8);
}
}
void ELST::setMediaTime(uint32_t cnt, uint64_t newVal) {
if (getVersion() == 1) {
setInt64(newVal, 28*cnt+16);
setInt64(newVal, 20*cnt+16);
} else {
setInt32(newVal, 20*cnt+12);
setInt32(newVal, 12*cnt+12);
}
}
uint64_t ELST::getMediaTime(uint32_t cnt) {
if (getVersion() == 1) {
return getInt64(28*cnt+16);
return getInt64(20*cnt+16);
} else {
return getInt32(20*cnt+12);
return getInt32(12*cnt+12);
}
}
void ELST::setMediaRateInteger(uint32_t cnt, uint16_t newVal) {
if (getVersion() == 1) {
setInt16(newVal, 28*cnt+24);
setInt16(newVal, 20*cnt+24);
} else {
setInt16(newVal, 20*cnt+16);
setInt16(newVal, 12*cnt+16);
}
}
uint16_t ELST::getMediaRateInteger(uint32_t cnt) {
if (getVersion() == 1) {
return getInt16(28*cnt+24);
return getInt16(20*cnt+24);
} else {
return getInt16(20*cnt+16);
return getInt16(12*cnt+16);
}
}
void ELST::setMediaRateFraction(uint32_t cnt, uint16_t newVal) {
if (getVersion() == 1) {
setInt16(newVal, 28*cnt+26);
setInt16(newVal, 20*cnt+26);
} else {
setInt16(newVal, 20*cnt+18);
setInt16(newVal, 12*cnt+18);
}
}

12
src/output/output_progressive_mp4.cpp
View file

@ -40,6 +40,12 @@ namespace Mist {
uint64_t res = 36 // FTYP Box
+ 8 //MOOV box
+ 108; //MVHD Box
uint64_t firstms = 0xFFFFFFFFFFFFFFFFull;
for (std::set<unsigned long>::iterator it = selectedTracks.begin(); it != selectedTracks.end(); it++){
if (myMeta.tracks[*it].firstms < firstms){
firstms = myMeta.tracks[*it].firstms;
}
}
for (std::set<unsigned long>::iterator it = selectedTracks.begin(); it != selectedTracks.end(); it++){
DTSC::Track & thisTrack = myMeta.tracks[*it];
uint64_t tmpRes = 0;
@ -54,6 +60,9 @@ namespace Mist {
+ 8 //MINF Box
+ 36 //DINF Box
+ 8; // STBL Box
if (thisTrack.firstms != firstms){
tmpRes += 12;// EDTS entry extra
}
//These boxes are empty when generating fragmented output
tmpRes += 20 + (partCount * 4);//STSZ
@ -140,7 +149,7 @@ namespace Mist {
//Then override it to set the correct duration
uint64_t firstms = 0xFFFFFFFFFFFFFFull;
uint64_t lastms = 0;
for (std::set<unsigned long>::iterator it = selectedTracks.begin(); it != selectedTracks.end(); it++) {
for (std::set<unsigned long>::iterator it = selectedTracks.begin(); it != selectedTracks.end(); it++){
lastms = std::max(lastms, (uint64_t)myMeta.tracks[*it].lastms);
firstms = std::min(firstms, (uint64_t)myMeta.tracks[*it].firstms);
}
@ -171,6 +180,7 @@ namespace Mist {
elstBox.setMediaTime(0, 0);
elstBox.setMediaRateInteger(0, 1);
elstBox.setMediaRateFraction(0, 0);
edtsBox.setContent(elstBox, 0);
trakBox.setContent(edtsBox, trakOffset++);