MP4Mp4vAtom::MP4Mp4vAtom(MP4File &file)
: MP4Atom(file, "mp4v")
{
AddReserved(*this, "reserved1", 6); /* 0 */
AddProperty( /* 1 */
new MP4Integer16Property(*this, "dataReferenceIndex"));
AddReserved(*this, "reserved2", 16); /* 2 */
AddProperty( /* 3 */
new MP4Integer16Property(*this, "width"));
AddProperty( /* 4 */
new MP4Integer16Property(*this, "height"));
AddReserved(*this, "reserved3", 14); /* 5 */
MP4StringProperty* pProp =
new MP4StringProperty(*this, "compressorName");
pProp->SetFixedLength(32);
pProp->SetCountedFormat(true);
pProp->SetValue("");
AddProperty(pProp); /* 6 */
AddReserved(*this, "reserved4", 4); /* 7 */
ExpectChildAtom("colr", Optional, OnlyOne);
ExpectChildAtom("esds", Required, OnlyOne);
ExpectChildAtom("pasp", Optional, OnlyOne);
}
MP4VideoAtom::MP4VideoAtom (const char *type)
: MP4Atom(type)
{
AddReserved("reserved1", 6); /* 0 */
AddProperty( /* 1 */
new MP4Integer16Property("dataReferenceIndex"));
AddReserved("reserved2", 16); /* 2 */
AddProperty( /* 3 */
new MP4Integer16Property("width"));
AddProperty( /* 4 */
new MP4Integer16Property("height"));
AddReserved("reserved3", 14); /* 5 */
MP4StringProperty* pProp =
new MP4StringProperty("compressorName");
pProp->SetFixedLength(32);
pProp->SetCountedFormat(true);
pProp->SetValue("");
AddProperty(pProp); /* 6 */
AddProperty(/* 7 */
new MP4Integer16Property("depth"));
AddProperty(/* 8 */
new MP4Integer16Property("colorTableId"));
ExpectChildAtom("smi ", Optional, OnlyOne);
}
// There is a spec incompatiblity between QT and MP4
// QT says name field is a counted string
// MP4 says name field is a null terminated string
// Here we attempt to make all things work
void MP4HdlrAtom::Read()
{
// read all the properties but the "name" field
ReadProperties(0, 5);
// take a peek at the next byte
u_int8_t strLength;
m_pFile->PeekBytes(&strLength, 1);
// if the value matches the remaining atom length
if (m_pFile->GetPosition() + strLength + 1 == GetEnd()) {
// read a counted string
MP4StringProperty* pNameProp =
(MP4StringProperty*)m_pProperties[5];
pNameProp->SetCountedFormat(true);
ReadProperties(5);
pNameProp->SetCountedFormat(false);
} else {
// read a null terminated string
ReadProperties(5);
}
Skip(); // to end of atom
}