void MP4StscAtom::Read()
{
// Read as usual
MP4Atom::Read();
// Compute the firstSample values for later use
u_int32_t count =
((MP4Integer32Property*)m_pProperties[2])->GetValue();
MP4Integer32Property* pFirstChunk = (MP4Integer32Property*)
((MP4TableProperty*)m_pProperties[3])->GetProperty(0);
MP4Integer32Property* pSamplesPerChunk = (MP4Integer32Property*)
((MP4TableProperty*)m_pProperties[3])->GetProperty(1);
MP4Integer32Property* pFirstSample = (MP4Integer32Property*)
((MP4TableProperty*)m_pProperties[3])->GetProperty(3);
MP4SampleId sampleId = 1;
for (u_int32_t i = 0; i < count; i++) {
pFirstSample->SetValue(sampleId, i);
if (i < count - 1) {
sampleId +=
(pFirstChunk->GetValue(i+1) - pFirstChunk->GetValue(i))
* pSamplesPerChunk->GetValue(i);
}
}
}
void MP4D263Atom::Write()
{
// Check whether we have valid values in the bitr atom
// (if it exists, of course)
MP4Atom* bitrAtom = FindAtom("d263.bitr");
if (bitrAtom) {
uint32_t avgBitrate;
uint32_t maxBitrate;
MP4Integer32Property* pProp;
bitrAtom->FindProperty("bitr.avgBitrate",
(MP4Property**)&pProp,
NULL);
ASSERT(pProp);
avgBitrate = pProp->GetValue();
bitrAtom->FindProperty("bitr.maxBitrate",
(MP4Property**)&pProp,
NULL);
ASSERT(pProp);
maxBitrate = pProp->GetValue();
if (!maxBitrate && !avgBitrate) {
DeleteChildAtom(bitrAtom);
}
}
MP4Atom::Write();
}
void MP4RtpHintTrack::InitRefTrack()
{
if (m_pRefTrack == NULL) {
MP4Integer32Property* pRefTrackIdProperty = NULL;
(void)m_pTrakAtom->FindProperty(
"trak.tref.hint.entries[0].trackId",
(MP4Property**)&pRefTrackIdProperty);
ASSERT(pRefTrackIdProperty);
m_pRefTrack = m_pFile->GetTrack(pRefTrackIdProperty->GetValue());
}
}
void MP4DrefAtom::Read()
{
/* do the usual read */
MP4Atom::Read();
// check that number of children == entryCount
MP4Integer32Property* pCount =
(MP4Integer32Property*)m_pProperties[2];
if (m_pChildAtoms.Size() != pCount->GetValue()) {
VERBOSE_READ(GetVerbosity(),
MP4Printf("Warning: dref inconsistency with number of entries"));
/* fix it */
pCount->SetReadOnly(false);
pCount->SetValue(m_pChildAtoms.Size());
pCount->SetReadOnly(true);
}
}
void MP4File::MakeFtypAtom(char* majorBrand, u_int32_t minorVersion, char** supportedBrands, u_int32_t supportedBrandsCount)
{
bool rewriteNeeded = false;
u_int32_t currentSupportedBrandsCount;
u_int32_t i;
MP4Atom* ftypAtom = m_pRootAtom->FindAtom("ftyp");
if (ftypAtom == NULL) {
ftypAtom = InsertChildAtom(m_pRootAtom, "ftyp", 0);
}
if (majorBrand == NULL)
return;
MP4StringProperty* pMajorBrandProperty;
if (!ftypAtom->FindProperty(
"ftyp.majorBrand",
(MP4Property**)&pMajorBrandProperty))
return;
pMajorBrandProperty->SetValue(majorBrand);
MP4Integer32Property* pMinorVersionProperty;
if (!ftypAtom->FindProperty(
"ftype.minorVersion",
(MP4Property**)&pMinorVersionProperty))
return;
pMinorVersionProperty->SetValue(minorVersion);
MP4Integer32Property* pCompatibleBrandsCountProperty;
if (!ftypAtom->FindProperty(
"ftyp.compatibleBrandsCount",
(MP4Property**)&pCompatibleBrandsCountProperty)) return;
currentSupportedBrandsCount = pCompatibleBrandsCountProperty->GetValue();
MP4TableProperty* pCompatibleBrandsProperty;
if (!ftypAtom->FindProperty(
"ftyp.compatibleBrands",
(MP4Property**)&pCompatibleBrandsProperty)) return;
MP4StringProperty* pBrandProperty = (MP4StringProperty*)
pCompatibleBrandsProperty->GetProperty(0);
ASSERT(pBrandProperty);
for (i = 0 ; i < ((currentSupportedBrandsCount > supportedBrandsCount) ? supportedBrandsCount : currentSupportedBrandsCount) ; i++) {
pBrandProperty->SetValue(supportedBrands[i], i);
}
if (i < supportedBrandsCount) {
for ( ; i < supportedBrandsCount ; i++) {
pBrandProperty->AddValue(supportedBrands[i]);
}
}
if (currentSupportedBrandsCount != supportedBrandsCount) {
rewriteNeeded = true;
pBrandProperty->SetCount(supportedBrandsCount);
pCompatibleBrandsCountProperty->SetReadOnly(false);
pCompatibleBrandsCountProperty->SetValue(supportedBrandsCount);
pCompatibleBrandsCountProperty->SetReadOnly(true);
}
}
MP4Track::MP4Track(MP4File* pFile, MP4Atom* pTrakAtom)
{
m_pFile = pFile;
m_pTrakAtom = pTrakAtom;
m_lastStsdIndex = 0;
m_lastSampleFile = NULL;
m_cachedReadSampleId = MP4_INVALID_SAMPLE_ID;
m_pCachedReadSample = NULL;
m_cachedReadSampleSize = 0;
m_writeSampleId = 1;
m_fixedSampleDuration = 0;
m_pChunkBuffer = NULL;
m_chunkBufferSize = 0;
m_chunkSamples = 0;
m_chunkDuration = 0;
m_samplesPerChunk = 0;
m_durationPerChunk = 0;
bool success = true;
MP4Integer32Property* pTrackIdProperty;
success &= m_pTrakAtom->FindProperty(
"trak.tkhd.trackId",
(MP4Property**)&pTrackIdProperty);
if (success) {
m_trackId = pTrackIdProperty->GetValue();
}
success &= m_pTrakAtom->FindProperty(
"trak.mdia.mdhd.timeScale",
(MP4Property**)&m_pTimeScaleProperty);
if (success) {
// default chunking is 1 second of samples
m_durationPerChunk = m_pTimeScaleProperty->GetValue();
}
success &= m_pTrakAtom->FindProperty(
"trak.tkhd.duration",
(MP4Property**)&m_pTrackDurationProperty);
success &= m_pTrakAtom->FindProperty(
"trak.mdia.mdhd.duration",
(MP4Property**)&m_pMediaDurationProperty);
success &= m_pTrakAtom->FindProperty(
"trak.tkhd.modificationTime",
(MP4Property**)&m_pTrackModificationProperty);
success &= m_pTrakAtom->FindProperty(
"trak.mdia.mdhd.modificationTime",
(MP4Property**)&m_pMediaModificationProperty);
success &= m_pTrakAtom->FindProperty(
"trak.mdia.hdlr.handlerType",
(MP4Property**)&m_pTypeProperty);
// get handles on sample size information
success &= m_pTrakAtom->FindProperty(
"trak.mdia.minf.stbl.stsz.sampleSize",
(MP4Property**)&m_pStszFixedSampleSizeProperty);
success &= m_pTrakAtom->FindProperty(
"trak.mdia.minf.stbl.stsz.sampleCount",
(MP4Property**)&m_pStszSampleCountProperty);
success &= m_pTrakAtom->FindProperty(
"trak.mdia.minf.stbl.stsz.entries.sampleSize",
(MP4Property**)&m_pStszSampleSizeProperty);
// get handles on information needed to map sample id's to file offsets
success &= m_pTrakAtom->FindProperty(
"trak.mdia.minf.stbl.stsc.entryCount",
(MP4Property**)&m_pStscCountProperty);
success &= m_pTrakAtom->FindProperty(
"trak.mdia.minf.stbl.stsc.entries.firstChunk",
(MP4Property**)&m_pStscFirstChunkProperty);
success &= m_pTrakAtom->FindProperty(
"trak.mdia.minf.stbl.stsc.entries.samplesPerChunk",
(MP4Property**)&m_pStscSamplesPerChunkProperty);
success &= m_pTrakAtom->FindProperty(
"trak.mdia.minf.stbl.stsc.entries.sampleDescriptionIndex",
(MP4Property**)&m_pStscSampleDescrIndexProperty);
success &= m_pTrakAtom->FindProperty(
"trak.mdia.minf.stbl.stsc.entries.firstSample",
(MP4Property**)&m_pStscFirstSampleProperty);
bool haveStco = m_pTrakAtom->FindProperty(
"trak.mdia.minf.stbl.stco.entryCount",
(MP4Property**)&m_pChunkCountProperty);
if (haveStco) {
success &= m_pTrakAtom->FindProperty(
"trak.mdia.minf.stbl.stco.entries.chunkOffset",
(MP4Property**)&m_pChunkOffsetProperty);
} else {
success &= m_pTrakAtom->FindProperty(
"trak.mdia.minf.stbl.co64.entryCount",
(MP4Property**)&m_pChunkCountProperty);
success &= m_pTrakAtom->FindProperty(
"trak.mdia.minf.stbl.co64.entries.chunkOffset",
(MP4Property**)&m_pChunkOffsetProperty);
}
// get handles on sample timing info
success &= m_pTrakAtom->FindProperty(
"trak.mdia.minf.stbl.stts.entryCount",
(MP4Property**)&m_pSttsCountProperty);
success &= m_pTrakAtom->FindProperty(
"trak.mdia.minf.stbl.stts.entries.sampleCount",
(MP4Property**)&m_pSttsSampleCountProperty);
success &= m_pTrakAtom->FindProperty(
"trak.mdia.minf.stbl.stts.entries.sampleDelta",
(MP4Property**)&m_pSttsSampleDeltaProperty);
// get handles on rendering offset info if it exists
m_pCttsCountProperty = NULL;
m_pCttsSampleCountProperty = NULL;
m_pCttsSampleOffsetProperty = NULL;
bool haveCtts = m_pTrakAtom->FindProperty(
"trak.mdia.minf.stbl.ctts.entryCount",
(MP4Property**)&m_pCttsCountProperty);
if (haveCtts) {
success &= m_pTrakAtom->FindProperty(
"trak.mdia.minf.stbl.ctts.entries.sampleCount",
(MP4Property**)&m_pCttsSampleCountProperty);
success &= m_pTrakAtom->FindProperty(
"trak.mdia.minf.stbl.ctts.entries.sampleOffset",
(MP4Property**)&m_pCttsSampleOffsetProperty);
}
// get handles on sync sample info if it exists
m_pStssCountProperty = NULL;
m_pStssSampleProperty = NULL;
bool haveStss = m_pTrakAtom->FindProperty(
"trak.mdia.minf.stbl.stss.entryCount",
(MP4Property**)&m_pStssCountProperty);
if (haveStss) {
success &= m_pTrakAtom->FindProperty(
"trak.mdia.minf.stbl.stss.entries.sampleNumber",
(MP4Property**)&m_pStssSampleProperty);
}
// edit list
InitEditListProperties();
// was everything found?
if (!success) {
throw new MP4Error("invalid track", "MP4Track::MP4Track");
}
}
