void MP4RootAtom::FinishOptimalWrite()
{
// finish writing mdat
m_pChildAtoms[GetLastMdatIndex()]->FinishWrite(m_pFile->Use64Bits("mdat"));
// find moov atom
u_int32_t size = m_pChildAtoms.Size();
MP4Atom* pMoovAtom = NULL;
u_int32_t i;
for (i = 0; i < size; i++) {
if (!strcmp("moov", m_pChildAtoms[i]->GetType())) {
pMoovAtom = m_pChildAtoms[i];
break;
}
}
ASSERT(i < size);
// rewrite moov so that updated chunkOffsets are written to disk
m_pFile->SetPosition(pMoovAtom->GetStart());
u_int64_t oldSize = pMoovAtom->GetSize();
pMoovAtom->Write();
// sanity check
u_int64_t newSize = pMoovAtom->GetSize();
ASSERT(oldSize == newSize);
}
void MP4File::MakeFtypAtom(char* majorBrand, u_int32_t minorVersion, char** supportedBrands, u_int32_t supportedBrandsCount)
{
bool rewriteNeeded = false;
u_int32_t currentSupportedBrandsCount;
u_int64_t currentSize;
u_int32_t i;
MP4Atom* ftypAtom = m_pRootAtom->FindAtom("ftyp");
ASSERT(ftypAtom);
currentSize = ftypAtom->GetSize();
MP4StringProperty* pMajorBrandProperty;
ftypAtom->FindProperty(
"ftyp.majorBrand",
(MP4Property**)&pMajorBrandProperty);
pMajorBrandProperty->SetValue(majorBrand);
MP4Integer32Property* pMinorVersionProperty;
ftypAtom->FindProperty(
"ftype.minorVersion",
(MP4Property**)&pMinorVersionProperty);
pMinorVersionProperty->SetValue(minorVersion);
MP4Integer32Property* pCompatibleBrandsCountProperty;
ftypAtom->FindProperty(
"ftyp.compatibleBrandsCount",
(MP4Property**)&pCompatibleBrandsCountProperty);
currentSupportedBrandsCount = pCompatibleBrandsCountProperty->GetValue();
MP4TableProperty* pCompatibleBrandsProperty;
ftypAtom->FindProperty(
"ftyp.compatibleBrands",
(MP4Property**)&pCompatibleBrandsProperty);
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);
}
}