long long ASF::File::readQWORD(bool *ok)
{
ByteVector v = readBlock(8);
if(v.size() != 8) {
if(ok) *ok = false;
return 0;
}
if(ok) *ok = true;
return v.toLongLong(false);
}
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));
}
}
}
}
void Ogg::PageHeader::read(Ogg::File *file, long pageOffset)
{
file->seek(pageOffset);
// An Ogg page header is at least 27 bytes, so we'll go ahead and read that
// much and then get the rest when we're ready for it.
const ByteVector data = file->readBlock(27);
// Sanity check -- make sure that we were in fact able to read as much data as
// we asked for and that the page begins with "OggS".
if(data.size() != 27 || !data.startsWith("OggS")) {
debug("Ogg::PageHeader::read() -- error reading page header");
return;
}
const std::bitset<8> flags(data[5]);
d->firstPacketContinued = flags.test(0);
d->firstPageOfStream = flags.test(1);
d->lastPageOfStream = flags.test(2);
d->absoluteGranularPosition = data.toLongLong(6, false);
d->streamSerialNumber = data.toUInt(14, false);
d->pageSequenceNumber = data.toUInt(18, false);
// Byte number 27 is the number of page segments, which is the only variable
// length portion of the page header. After reading the number of page
// segments we'll then read in the corresponding data for this count.
int pageSegmentCount = static_cast<unsigned char>(data[26]);
const ByteVector pageSegments = file->readBlock(pageSegmentCount);
// Another sanity check.
if(pageSegmentCount < 1 || int(pageSegments.size()) != pageSegmentCount)
return;
// The base size of an Ogg page 27 bytes plus the number of lacing values.
d->size = 27 + pageSegmentCount;
int packetSize = 0;
for(int i = 0; i < pageSegmentCount; i++) {
d->dataSize += static_cast<unsigned char>(pageSegments[i]);
packetSize += static_cast<unsigned char>(pageSegments[i]);
if(static_cast<unsigned char>(pageSegments[i]) < 255) {
d->packetSizes.append(packetSize);
packetSize = 0;
}
}
if(packetSize > 0) {
d->packetSizes.append(packetSize);
d->lastPacketCompleted = false;
}
else
d->lastPacketCompleted = true;
d->isValid = true;
}
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;
}
}
long long ASF::File::readQWORD()
{
ByteVector v = readBlock(8);
return v.toLongLong(false);
}
void
MP4::Properties::read(File *file, Atoms *atoms)
{
MP4::Atom *moov = atoms->find("moov");
if(!moov) {
debug("MP4: Atom 'moov' not found");
return;
}
MP4::Atom *trak = 0;
ByteVector data;
const MP4::AtomList trakList = moov->findall("trak");
for(MP4::AtomList::ConstIterator it = trakList.begin(); it != trakList.end(); ++it) {
trak = *it;
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.containsAt("soun", 16)) {
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);
const unsigned int version = data[8];
long long unit;
long long length;
if(version == 1) {
if(data.size() < 36 + 8) {
debug("MP4: Atom 'trak.mdia.mdhd' is smaller than expected");
return;
}
unit = data.toUInt(28U);
length = data.toLongLong(32U);
}
else {
if(data.size() < 24 + 8) {
debug("MP4: Atom 'trak.mdia.mdhd' is smaller than expected");
return;
}
unit = data.toUInt(20U);
length = data.toUInt(24U);
}
if(unit > 0 && length > 0)
d->length = static_cast<int>(length * 1000.0 / unit + 0.5);
MP4::Atom *atom = trak->find("mdia", "minf", "stbl", "stsd");
if(!atom) {
return;
}
file->seek(atom->offset);
data = file->readBlock(atom->length);
if(data.containsAt("mp4a", 20)) {
d->codec = AAC;
d->channels = data.toShort(40U);
d->bitsPerSample = data.toShort(42U);
d->sampleRate = data.toUInt(46U);
if(data.containsAt("esds", 56) && data[64] == 0x03) {
unsigned int pos = 65;
if(data.containsAt("\x80\x80\x80", pos)) {
pos += 3;
}
pos += 4;
if(data[pos] == 0x04) {
pos += 1;
if(data.containsAt("\x80\x80\x80", pos)) {
pos += 3;
}
pos += 10;
d->bitrate = static_cast<int>((data.toUInt(pos) + 500) / 1000.0 + 0.5);
}
}
}
else if(data.containsAt("alac", 20)) {
if(atom->length == 88 && data.containsAt("alac", 56)) {
d->codec = ALAC;
d->bitsPerSample = data.at(69);
d->channels = data.at(73);
d->bitrate = static_cast<int>(data.toUInt(80U) / 1000.0 + 0.5);
d->sampleRate = data.toUInt(84U);
}
}
MP4::Atom *drms = atom->find("drms");
if(drms) {
d->encrypted = true;
}
}
