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Fixes to CMAF output

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This commit is contained in:
Thulinma 2020-02-17 17:02:05 +01:00
parent e217f41f17
commit a8e04e1787
7 changed files with 69 additions and 84 deletions
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84
lib/cmaf.cpp
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@ -1,24 +1,13 @@
#include "cmaf.h"
static uint64_t unixBootDiff = (Util::unixMS() - Util::bootMS());
namespace CMAF{
/// Function to determine the payload size of a CMAF fragment.
/// \parm isKeyIndex indicates whether we are sending DTSC Fragment or DTSC Key based CMAF fragments.
size_t payloadSize(const DTSC::Meta &M, size_t track, size_t index, bool isKeyIndex){
DTSC::Fragments fragments(M.fragments(track));
DTSC::Keys keys(M.keys(track));
size_t payloadSize(const DTSC::Meta &M, size_t track, uint64_t startTime, uint64_t endTime){
DTSC::Parts parts(M.parts(track));
size_t firstKey = (isKeyIndex ? index : fragments.getFirstKey(index));
size_t endKey = keys.getEndValid();
if (isKeyIndex) {
if (index + 1 < keys.getEndValid()){endKey = index + 1;}
} else {
if (index + 1 < fragments.getEndValid()){endKey = fragments.getFirstKey(index + 1);}
}
size_t firstPart = keys.getFirstPart(firstKey);
size_t endPart = parts.getEndValid();
if (endKey != keys.getEndValid()){endPart = keys.getFirstPart(endKey);}
size_t firstPart = M.getPartIndex(startTime, track);
size_t endPart = M.getPartIndex(endTime, track);
size_t payloadSize = 0;
for (size_t i = firstPart; i < endPart; i++){payloadSize += parts.getSize(i);}
return payloadSize;
@ -186,7 +175,7 @@ namespace CMAF{
((i + 1 < fragments.getEndValid()) ? fragments.getFirstKey(i + 1) : keys.getEndValid());
MP4::sidxReference refItem;
refItem.referencedSize = payloadSize(M, track, i) + fragmentHeaderSize(M, track, i) + 8;
refItem.referencedSize = payloadSize(M, track, keys.getTime(firstKey), keys.getTime(endKey)) + fragmentHeaderSize(M, track, i) + 8;
refItem.subSegmentDuration =
(endKey == keys.getEndValid() ? M.getLastms(track) : keys.getTime(endKey)) - keys.getTime(firstKey);
refItem.sapStart = true;
@ -304,7 +293,7 @@ namespace CMAF{
if (M.getVod()){
tfdtBox.setBaseMediaDecodeTime(M.getTimeForFragmentIndex(track, fragment) - M.getFirstms(track));
}else{
tfdtBox.setBaseMediaDecodeTime((UTCTime ? Util::epoch()*1000 : M.getTimeForFragmentIndex(track, fragment)));
tfdtBox.setBaseMediaDecodeTime((UTCTime ? M.getTimeForFragmentIndex(track, fragment) + M.getBootMsOffset() + unixBootDiff : M.getTimeForFragmentIndex(track, fragment)));
}
trafBox.setContent(tfdtBox, 1);
@ -337,50 +326,36 @@ namespace CMAF{
/// Calculates the full size of a 'moof' box for a DTSC::Key based fragment.
/// Used when building the 'moof' box to calculate the relative data offsets.
size_t keyHeaderSize(const DTSC::Meta &M, size_t track, size_t key){
size_t keyHeaderSize(const DTSC::Meta &M, size_t track, uint64_t startTime, uint64_t endTime){
uint64_t tmpRes = 8 + 16 + 32 + 20;
DTSC::Keys keys(M.keys(track));
DTSC::Parts parts(M.parts(track));
size_t firstPart = keys.getFirstPart(key);
size_t endPart = parts.getEndValid();
if (key + 1 < keys.getEndValid()){
endPart = keys.getFirstPart(key + 1);
}
size_t firstPart = M.getPartIndex(startTime, track);
size_t endPart = M.getPartIndex(endTime, track);
tmpRes += 24 + ((endPart - firstPart) * 12);
return tmpRes;
}
/// Generates the 'moof' box for a DTSC::Key based CMAF fragment.
std::string keyHeader(const DTSC::Meta &M, size_t track, size_t key, bool simplifyTrackIds, bool UTCTime){
DTSC::Keys keys(M.keys(track));
DTSC::Parts parts(M.parts(track));
size_t firstPart = keys.getFirstPart(key);
size_t endPart = parts.getEndValid();
if (key + 1 < keys.getEndValid()){
endPart = keys.getFirstPart(key + 1);
}
std::string keyHeader(const DTSC::Meta &M, size_t track, uint64_t startTime, uint64_t endTime, uint64_t segmentNum, bool simplifyTrackIds, bool UTCTime){
size_t firstPart = M.getPartIndex(startTime, track);
size_t endPart = M.getPartIndex(endTime, track);
std::stringstream header;
MP4::MOOF moofBox;
MP4::MFHD mfhdBox(key + 1);
MP4::MFHD mfhdBox(segmentNum);
moofBox.setContent(mfhdBox, 0);
std::set<sortPart> trunOrder;
//We use keyHeaderSize here to determine the relative offsets of the data in the 'mdat' box.
uint64_t relativeOffset = keyHeaderSize(M, track, key) + 8;
uint64_t relativeOffset = keyHeaderSize(M, track, startTime, endTime) + 8;
sortPart temp;
temp.time = keys.getTime(key);
temp.time = startTime;
temp.partIndex = firstPart;
temp.bytePos = relativeOffset;
DTSC::Parts parts(M.parts(track));
for (size_t p = firstPart; p < endPart; p++){
trunOrder.insert(temp);
temp.time += parts.getDuration(p);
@ -405,9 +380,9 @@ namespace CMAF{
MP4::TFDT tfdtBox;
if (M.getVod()){
tfdtBox.setBaseMediaDecodeTime(keys.getTime(key) - M.getFirstms(track));
tfdtBox.setBaseMediaDecodeTime(startTime - M.getFirstms(track));
}else{
tfdtBox.setBaseMediaDecodeTime((UTCTime ? Util::epoch()*1000 : keys.getTime(key) ));
tfdtBox.setBaseMediaDecodeTime((UTCTime ? startTime + M.getBootMsOffset() + unixBootDiff : startTime));
}
trafBox.setContent(tfdtBox, 1);
@ -421,12 +396,21 @@ namespace CMAF{
size_t trunOffset = 0;
for (std::set<sortPart>::iterator it = trunOrder.begin(); it != trunOrder.end(); it++){
MP4::trunSampleInformation sampleInfo;
sampleInfo.sampleSize = parts.getSize(it->partIndex);
sampleInfo.sampleDuration = parts.getDuration(it->partIndex);
sampleInfo.sampleOffset = parts.getOffset(it->partIndex);
trunBox.setSampleInformation(sampleInfo, trunOffset++);
if (trunOrder.size()){
std::set<sortPart>::iterator lastOne = trunOrder.end();
lastOne--;
for (std::set<sortPart>::iterator it = trunOrder.begin(); it != trunOrder.end(); it++){
MP4::trunSampleInformation sampleInfo;
sampleInfo.sampleSize = parts.getSize(it->partIndex);
sampleInfo.sampleDuration = parts.getDuration(it->partIndex);
if (it == lastOne){
sampleInfo.sampleDuration = endTime - it->time;
}
sampleInfo.sampleOffset = parts.getOffset(it->partIndex);
trunBox.setSampleInformation(sampleInfo, trunOffset++);
}
}else{
WARN_MSG("Empty CMAF header for track %zu: %zu-%zu contains no packets (first: %" PRIu64 ", last: %" PRIu64 "), firstPart=%zu, lastPart=%zu", track, startTime, endTime, M.getFirstms(track), M.getLastms(track), firstPart, endPart);
}
trafBox.setContent(trunBox, 2);