bool
MP4::File::checkValid(const MP4::AtomList &list)
{
for(uint i = 0; i < list.size(); i++) {
if(list[i]->length == 0)
return false;
if(!checkValid(list[i]->children))
return false;
}
return true;
}
void
MP4::Tag::updateOffsets(long delta, long offset)
{
MP4::Atom *moov = d->atoms->find("moov");
if(moov) {
MP4::AtomList stco = moov->findall("stco", true);
for(unsigned int i = 0; i < stco.size(); i++) {
MP4::Atom *atom = stco[i];
if(atom->offset > offset) {
atom->offset += delta;
}
d->file->seek(atom->offset + 12);
ByteVector data = d->file->readBlock(atom->length - 12);
unsigned int count = data.toUInt();
d->file->seek(atom->offset + 16);
uint pos = 4;
while(count--) {
long o = static_cast<long>(data.toUInt(pos));
if(o > offset) {
o += delta;
}
d->file->writeBlock(ByteVector::fromUInt(o));
pos += 4;
}
}
MP4::AtomList co64 = moov->findall("co64", true);
for(unsigned int i = 0; i < co64.size(); i++) {
MP4::Atom *atom = co64[i];
if(atom->offset > offset) {
atom->offset += delta;
}
d->file->seek(atom->offset + 12);
ByteVector data = d->file->readBlock(atom->length - 12);
unsigned int count = data.toUInt();
d->file->seek(atom->offset + 16);
uint pos = 4;
while(count--) {
long long o = data.toLongLong(pos);
if(o > offset) {
o += delta;
}
d->file->writeBlock(ByteVector::fromLongLong(o));
pos += 8;
}
}
}
MP4::Atom *moof = d->atoms->find("moof");
if(moof) {
MP4::AtomList tfhd = moof->findall("tfhd", true);
for(unsigned int i = 0; i < tfhd.size(); i++) {
MP4::Atom *atom = tfhd[i];
if(atom->offset > offset) {
atom->offset += delta;
}
d->file->seek(atom->offset + 9);
ByteVector data = d->file->readBlock(atom->length - 9);
const unsigned int flags = data.toUInt(0, 3, true);
if(flags & 1) {
long long o = data.toLongLong(7U);
if(o > offset) {
o += delta;
}
d->file->seek(atom->offset + 16);
d->file->writeBlock(ByteVector::fromLongLong(o));
}
}
}
}
MP4::Properties::Properties(File *file, MP4::Atoms *atoms, ReadStyle style)
: AudioProperties(style)
{
d = new PropertiesPrivate;
MP4::Atom *moov = atoms->find("moov");
if(!moov) {
debug("MP4: Atom 'moov' not found");
return;
}
MP4::Atom *trak = 0;
ByteVector data;
MP4::AtomList trakList = moov->findall("trak");
for (unsigned int i = 0; i < trakList.size(); i++) {
trak = trakList[i];
MP4::Atom *hdlr = trak->find("mdia", "hdlr");
if(!hdlr) {
debug("MP4: Atom 'trak.mdia.hdlr' not found");
return;
}
file->seek(hdlr->offset);
data = file->readBlock(hdlr->length);
if(data.mid(16, 4) == "soun") {
break;
}
trak = 0;
}
if (!trak) {
debug("MP4: No audio tracks");
return;
}
MP4::Atom *mdhd = trak->find("mdia", "mdhd");
if(!mdhd) {
debug("MP4: Atom 'trak.mdia.mdhd' not found");
return;
}
file->seek(mdhd->offset);
data = file->readBlock(mdhd->length);
if(data[8] == 0) {
unsigned int unit = data.mid(20, 4).toUInt();
unsigned int length = data.mid(24, 4).toUInt();
if (unit == 0) {
debug("MP4: No valid data");
d->length = 0;
} else {
d->length = length / unit;
}
}
else {
long long unit = data.mid(28, 8).toLongLong();
long long length = data.mid(36, 8).toLongLong();
if (unit == 0) {
debug("MP4: No valid data");
d->length = 0;
} else {
d->length = int(length / unit);
}
}
MP4::Atom *atom = trak->find("mdia", "minf", "stbl", "stsd");
if(!atom) {
return;
}
file->seek(atom->offset);
data = file->readBlock(atom->length);
if(data.mid(20, 4) == "mp4a") {
d->channels = data.mid(40, 2).toShort();
d->bitsPerSample = data.mid(42, 2).toShort();
d->sampleRate = data.mid(46, 4).toUInt();
if(data.mid(56, 4) == "esds" && data[64] == 0x03) {
long pos = 65;
if(data.mid(pos, 3) == "\x80\x80\x80") {
pos += 3;
}
pos += 4;
if(data[pos] == 0x04) {
pos += 1;
if(data.mid(pos, 3) == "\x80\x80\x80") {
pos += 3;
}
pos += 10;
d->bitrate = (data.mid(pos, 4).toUInt() + 500) / 1000;
}
}
}
}
MP4::Properties::Properties(File *file, MP4::Atoms *atoms, ReadStyle style)
: AudioProperties(style)
{
d = new PropertiesPrivate;
MP4::Atom *moov = atoms->find("moov");
if(!moov) {
debug("MP4: Atom 'moov' not found");
return;
}
MP4::Atom *trak = 0;
ByteVector data;
MP4::AtomList trakList = moov->findall("trak");
for (unsigned int i = 0; i < trakList.size(); i++) {
trak = trakList[i];
MP4::Atom *hdlr = trak->find("mdia", "hdlr");
if(!hdlr) {
debug("MP4: Atom 'trak.mdia.hdlr' not found");
return;
}
file->seek(hdlr->offset);
data = file->readBlock(hdlr->length);
if(data.mid(16, 4) == "soun") {
break;
}
trak = 0;
}
if (!trak) {
debug("MP4: No audio tracks");
return;
}
MP4::Atom *mdhd = trak->find("mdia", "mdhd");
if(!mdhd) {
debug("MP4: Atom 'trak.mdia.mdhd' not found");
return;
}
file->seek(mdhd->offset);
data = file->readBlock(mdhd->length);
uint version = data[8];
if(version == 1) {
if (data.size() < 36 + 8) {
debug("MP4: Atom 'trak.mdia.mdhd' is smaller than expected");
return;
}
const long long unit = data.toLongLong(28U);
const long long length = data.toLongLong(36U);
d->length = unit ? int(length / unit) : 0;
}
else {
if (data.size() < 24 + 4) {
debug("MP4: Atom 'trak.mdia.mdhd' is smaller than expected");
return;
}
const unsigned int unit = data.toUInt(20U);
const unsigned int length = data.toUInt(24U);
d->length = unit ? length / unit : 0;
}
MP4::Atom *atom = trak->find("mdia", "minf", "stbl", "stsd");
if(!atom) {
return;
}
file->seek(atom->offset);
data = file->readBlock(atom->length);
if(data.mid(20, 4) == "mp4a") {
d->channels = data.toShort(40U);
d->bitsPerSample = data.toShort(42U);
d->sampleRate = data.toUInt(46U);
if(data.mid(56, 4) == "esds" && data[64] == 0x03) {
uint pos = 65;
if(data.mid(pos, 3) == "\x80\x80\x80") {
pos += 3;
}
pos += 4;
if(data[pos] == 0x04) {
pos += 1;
if(data.mid(pos, 3) == "\x80\x80\x80") {
pos += 3;
}
pos += 10;
d->bitrate = (data.toUInt(pos) + 500) / 1000;
}
}
}
else if (data.mid(20, 4) == "alac") {
if (atom->length == 88 && data.mid(56, 4) == "alac") {
d->bitsPerSample = data.at(69);
d->channels = data.at(73);
d->bitrate = data.toUInt(80U) / 1000;
d->sampleRate = data.toUInt(84U);
}
}
MP4::Atom *drms = atom->find("drms");
if(drms) {
d->encrypted = true;
}
}