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 MP4Track::UpdateSyncSamples(MP4SampleId sampleId, bool isSyncSample)
{
if (isSyncSample) {
// if stss atom exists, add entry
if (m_pStssCountProperty) {
m_pStssSampleProperty->AddValue(sampleId);
m_pStssCountProperty->IncrementValue();
} // else nothing to do (yet)
} else { // !isSyncSample
// if stss atom doesn't exist, create one
if (m_pStssCountProperty == NULL) {
MP4Atom* pStssAtom = AddAtom("trak.mdia.minf.stbl", "stss");
pStssAtom->FindProperty(
"stss.entryCount",
(MP4Property**)&m_pStssCountProperty);
pStssAtom->FindProperty(
"stss.entries.sampleNumber",
(MP4Property**)&m_pStssSampleProperty);
// set values for all samples that came before this one
for (MP4SampleId sid = 1; sid < sampleId; sid++) {
m_pStssSampleProperty->AddValue(sid);
m_pStssCountProperty->IncrementValue();
}
} // else nothing to do
}
}
void MP4Track::UpdateRenderingOffsets(MP4SampleId sampleId,
MP4Duration renderingOffset)
{
// if ctts atom doesn't exist
if (m_pCttsCountProperty == NULL) {
// no rendering offset, so nothing to do
if (renderingOffset == 0) {
return;
}
// else create a ctts atom
MP4Atom* pCttsAtom = AddAtom("trak.mdia.minf.stbl", "ctts");
// and get handles on the properties
pCttsAtom->FindProperty(
"ctts.entryCount",
(MP4Property**)&m_pCttsCountProperty);
pCttsAtom->FindProperty(
"ctts.entries.sampleCount",
(MP4Property**)&m_pCttsSampleCountProperty);
pCttsAtom->FindProperty(
"ctts.entries.sampleOffset",
(MP4Property**)&m_pCttsSampleOffsetProperty);
// if this is not the first sample
if (sampleId > 1) {
// add a ctts entry for all previous samples
// with rendering offset equal to zero
m_pCttsSampleCountProperty->AddValue(sampleId - 1);
m_pCttsSampleOffsetProperty->AddValue(0);
m_pCttsCountProperty->IncrementValue();;
}
}
// ctts atom exists (now)
u_int32_t numCtts = m_pCttsCountProperty->GetValue();
// if renderingOffset == renderingOffset of last entry
if (numCtts && renderingOffset
== m_pCttsSampleOffsetProperty->GetValue(numCtts-1)) {
// increment last entry sampleCount
m_pCttsSampleCountProperty->IncrementValue(1, numCtts-1);
} else {
// add ctts entry, sampleCount = 1, sampleOffset = renderingOffset
m_pCttsSampleCountProperty->AddValue(1);
m_pCttsSampleOffsetProperty->AddValue(renderingOffset);
m_pCttsCountProperty->IncrementValue();
}
}
bool MP4Track::InitEditListProperties()
{
m_pElstCountProperty = NULL;
m_pElstMediaTimeProperty = NULL;
m_pElstDurationProperty = NULL;
m_pElstRateProperty = NULL;
m_pElstReservedProperty = NULL;
MP4Atom* pElstAtom =
m_pTrakAtom->FindAtom("trak.edts.elst");
if (!pElstAtom) {
return false;
}
pElstAtom->FindProperty(
"elst.entryCount",
(MP4Property**)&m_pElstCountProperty);
pElstAtom->FindProperty(
"elst.entries.mediaTime",
(MP4Property**)&m_pElstMediaTimeProperty);
pElstAtom->FindProperty(
"elst.entries.segmentDuration",
(MP4Property**)&m_pElstDurationProperty);
pElstAtom->FindProperty(
"elst.entries.mediaRate",
(MP4Property**)&m_pElstRateProperty);
pElstAtom->FindProperty(
"elst.entries.reserved",
(MP4Property**)&m_pElstReservedProperty);
return m_pElstCountProperty
&& m_pElstMediaTimeProperty
&& m_pElstDurationProperty
&& m_pElstRateProperty
&& m_pElstReservedProperty;
}
bool
PictureAspectRatioBox::set( MP4FileHandle file, uint16_t trackIndex, const Item& item )
{
MP4Atom* coding;
if( findCoding( file, trackIndex, coding ))
throw new MP4Exception( "supported coding not found" );
MP4Atom* pasp;
if( findPictureAspectRatioBox( file, *coding, pasp ))
throw new MP4Exception( "pasp-box not found" );
MP4Integer16Property* hSpacing;
MP4Integer16Property* vSpacing;
if( pasp->FindProperty( "pasp.hSpacing", (MP4Property**)&hSpacing ))
hSpacing->SetValue( item.hSpacing );
if( pasp->FindProperty( "pasp.vSpacing", (MP4Property**)&vSpacing ))
vSpacing->SetValue( item.vSpacing );
return false;
}
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);
}
}
FILE* MP4Track::GetSampleFile(MP4SampleId sampleId)
{
u_int32_t stscIndex =
GetSampleStscIndex(sampleId);
u_int32_t stsdIndex =
m_pStscSampleDescrIndexProperty->GetValue(stscIndex);
// check if the answer will be the same as last time
if (m_lastStsdIndex && stsdIndex == m_lastStsdIndex) {
return m_lastSampleFile;
}
MP4Atom* pStsdAtom =
m_pTrakAtom->FindAtom("trak.mdia.minf.stbl.stsd");
ASSERT(pStsdAtom);
MP4Atom* pStsdEntryAtom =
pStsdAtom->GetChildAtom(stsdIndex - 1);
ASSERT(pStsdEntryAtom);
MP4Integer16Property* pDrefIndexProperty = NULL;
pStsdEntryAtom->FindProperty(
"*.dataReferenceIndex",
(MP4Property**)&pDrefIndexProperty);
if (pDrefIndexProperty == NULL) {
throw new MP4Error("invalid stsd entry", "GetSampleFile");
}
u_int32_t drefIndex =
pDrefIndexProperty->GetValue();
MP4Atom* pDrefAtom =
m_pTrakAtom->FindAtom("trak.mdia.minf.dinf.dref");
ASSERT(pDrefAtom);
MP4Atom* pUrlAtom =
pDrefAtom->GetChildAtom(drefIndex - 1);
ASSERT(pUrlAtom);
FILE* pFile;
if (pUrlAtom->GetFlags() & 1) {
pFile = NULL; // self-contained
} else {
#ifndef USE_FILE_CALLBACKS
MP4StringProperty* pLocationProperty = NULL;
pUrlAtom->FindProperty(
"*.location",
(MP4Property**)&pLocationProperty);
ASSERT(pLocationProperty);
const char* url = pLocationProperty->GetValue();
VERBOSE_READ_SAMPLE(m_pFile->GetVerbosity(),
printf("dref url = %s\n", url));
pFile = (FILE*)-1;
// attempt to open url if it's a file url
// currently this is the only thing we understand
if (!strncmp(url, "file:", 5)) {
const char* fileName = url + 5;
if (!strncmp(fileName, "//", 2)) {
fileName = strchr(fileName + 2, '/');
}
if (fileName) {
pFile = fopen(fileName, "rb");
if (!pFile) {
pFile = (FILE*)-1;
}
}
}
#else
throw new MP4Error(errno, "Function not supported when using callbacks", "GetSampleFile");
#endif
}
if (m_lastSampleFile) {
#ifndef USE_FILE_CALLBACKS
fclose(m_lastSampleFile);
#else
throw new MP4Error(errno, "Function not supported when using callbacks", "GetSampleFile");
#endif
}
// cache the answer
m_lastStsdIndex = stsdIndex;
m_lastSampleFile = pFile;
return pFile;
}
