void APE::Properties::analyzeCurrent(File *file)
{
// Read the descriptor
file->seek(2, File::Current);
const ByteVector descriptor = file->readBlock(44);
if(descriptor.size() < 44) {
debug("APE::Properties::analyzeCurrent() -- descriptor is too short.");
return;
}
const unsigned int descriptorBytes = descriptor.toUInt(0, false);
if((descriptorBytes - 52) > 0)
file->seek(descriptorBytes - 52, File::Current);
// Read the header
const ByteVector header = file->readBlock(24);
if(header.size() < 24) {
debug("APE::Properties::analyzeCurrent() -- MAC header is too short.");
return;
}
// Get the APE info
d->channels = header.toShort(18, false);
d->sampleRate = header.toUInt(20, false);
d->bitsPerSample = header.toShort(16, false);
const unsigned int totalFrames = header.toUInt(12, false);
if(totalFrames == 0)
return;
const unsigned int blocksPerFrame = header.toUInt(4, false);
const unsigned int finalFrameBlocks = header.toUInt(8, false);
d->sampleFrames = (totalFrames - 1) * blocksPerFrame + finalFrameBlocks;
}
void
MP4::Tag::parseCovr(const MP4::Atom *atom)
{
MP4::CoverArtList value;
ByteVector data = d->file->readBlock(atom->length - 8);
unsigned int pos = 0;
while(pos < data.size()) {
const int length = static_cast<int>(data.toUInt(pos));
if(length < 12) {
debug("MP4: Too short atom");
break;;
}
const ByteVector name = data.mid(pos + 4, 4);
const int flags = static_cast<int>(data.toUInt(pos + 8));
if(name != "data") {
debug("MP4: Unexpected atom \"" + name + "\", expecting \"data\"");
break;
}
if(flags == TypeJPEG || flags == TypePNG || flags == TypeBMP ||
flags == TypeGIF || flags == TypeImplicit) {
value.append(MP4::CoverArt(MP4::CoverArt::Format(flags),
data.mid(pos + 16, length - 16)));
}
else {
debug("MP4: Unknown covr format " + String::number(flags));
}
pos += length;
}
if(value.size() > 0)
addItem(atom->name, value);
}
void APE::Footer::parse(const ByteVector &data)
{
if ( data.size() < size() ) {
return;
}
// The first eight bytes, data[0..7], are the File Identifier, "APETAGEX".
// Read the version number
d->version = data.toUInt(8, false);
// Read the tag size
d->tagSize = data.toUInt(12, false);
// Read the item count
d->itemCount = data.toUInt(16, false);
// Read the flags
std::bitset<32> flags( TAGLIB_CONSTRUCT_BITSET( data.toUInt(20, false) ) );
d->headerPresent = flags[31];
d->footerPresent = !flags[30];
d->isHeader = flags[29];
}
MP4::AtomDataList MP4::Tag::parseData2(MP4::Atom *atom, TagLib::File *file, int expectedFlags, bool freeForm)
{
AtomDataList result;
ByteVector data = file->readBlock(atom->length - 8);
int i = 0;
unsigned int pos = 0;
while ( pos < data.size() ) {
const int length = static_cast<int> ( data.toUInt(pos) );
ByteVector name = data.mid(pos + 4, 4);
const int flags = static_cast<int> ( data.toUInt(pos + 8) );
if ( freeForm && (i < 2) ) {
if ( (i == 0) && (name != "mean") ) {
debug("MP4: Unexpected atom \"" + name + "\", expecting \"mean\"");
return result;
} else if ( (i == 1) && (name != "name") ) {
debug("MP4: Unexpected atom \"" + name + "\", expecting \"name\"");
return result;
}
result.append( AtomData( AtomDataType(flags), data.mid(pos + 12, length - 12) ) );
} else {
if ( name != "data" ) {
debug("MP4: Unexpected atom \"" + name + "\", expecting \"data\"");
return result;
}
if ( (expectedFlags == -1) || (flags == expectedFlags) ) {
result.append( AtomData( AtomDataType(flags), data.mid(pos + 16, length - 16) ) );
}
}
pos += length;
i++;
}
return result;
}
void Vorbis::Properties::read()
{
// Get the identification header from the Ogg implementation.
ByteVector data = d->file->packet(0);
uint pos = 0;
if(data.mid(pos, 7) != vorbisSetupHeaderID) {
debug("Vorbis::Properties::read() -- invalid Vorbis identification header");
return;
}
pos += 7;
d->vorbisVersion = data.toUInt(pos, false);
pos += 4;
d->channels = uchar(data[pos]);
pos += 1;
d->sampleRate = data.toUInt(pos, false);
pos += 4;
d->bitrateMaximum = data.toUInt(pos, false);
pos += 4;
d->bitrateNominal = data.toUInt(pos, false);
pos += 4;
d->bitrateMinimum = data.toUInt(pos, false);
// TODO: Later this should be only the "fast" mode.
d->bitrate = d->bitrateNominal;
// Find the length of the file. See http://wiki.xiph.org/VorbisStreamLength/
// for my notes on the topic.
const Ogg::PageHeader *first = d->file->firstPageHeader();
const Ogg::PageHeader *last = d->file->lastPageHeader();
if(first && last) {
long long start = first->absoluteGranularPosition();
long long end = last->absoluteGranularPosition();
if(start >= 0 && end >= 0 && d->sampleRate > 0)
d->length = (int)((end - start) / (long long) d->sampleRate);
else
debug("Vorbis::Properties::read() -- Either the PCM values for the start or "
"end of this file was incorrect or the sample rate is zero.");
}
else
debug("Vorbis::Properties::read() -- Could not find valid first and last Ogg pages.");
}
void RIFF::WAV::Properties::read(const ByteVector &data)
{
d->format = data.toShort(0, false);
d->channels = data.toShort(2, false);
d->sampleRate = data.toUInt(4, false);
d->sampleWidth = data.toShort(14, false);
const uint byteRate = data.toUInt(8, false);
d->bitrate = byteRate * 8 / 1000;
d->length = byteRate > 0 ? d->streamLength / byteRate : 0;
if(d->channels > 0 && d->sampleWidth > 0)
d->sampleFrames = d->streamLength / (d->channels * ((d->sampleWidth + 7) / 8));
}
void ASF::Picture::parse(const ByteVector& bytes)
{
d->valid = false;
if(bytes.size() < 9)
return;
int pos = 0;
d->type = (Type)bytes[0]; ++pos;
const uint dataLen = bytes.toUInt(pos, false); pos+=4;
const ByteVector nullStringTerminator(2, 0);
int endPos = bytes.find(nullStringTerminator, pos, 2);
if(endPos < 0)
return;
d->mimeType = String(bytes.mid(pos, endPos - pos), String::UTF16LE);
pos = endPos+2;
endPos = bytes.find(nullStringTerminator, pos, 2);
if(endPos < 0)
return;
d->description = String(bytes.mid(pos, endPos - pos), String::UTF16LE);
pos = endPos+2;
if(dataLen + pos != bytes.size())
return;
d->picture = bytes.mid(pos, dataLen);
d->valid = true;
return;
}
void APE::Item::parse(const ByteVector &data)
{
// 11 bytes is the minimum size for an APE item
if(data.size() < 11) {
debug("APE::Item::parse() -- no data in item");
return;
}
const uint valueLength = data.toUInt(0, false);
const uint flags = data.toUInt(4, false);
const int keyLength = data.find('\0', 8) - 8;
if(keyLength < 1 || keyLength > 255)
{
debug("APE::Item::parse() -- invalid key in item");
return;
}
d->key = String(data.mid(8, keyLength), String::UTF8);
const ByteVector value = data.mid(8 + d->key.size() + 1, valueLength);
setReadOnly(flags & 1);
setType(ItemTypes((flags >> 1) & 3));
if(Text == d->type)
d->text = StringList(ByteVectorList::split(value, '\0'), String::UTF8);
else
d->value = value;
}
void Ogg::XiphComment::parse(const ByteVector &data)
{
// The first thing in the comment data is the vendor ID length, followed by a
// UTF8 string with the vendor ID.
uint pos = 0;
const uint vendorLength = data.toUInt(0, false);
pos += 4;
d->vendorID = String(data.mid(pos, vendorLength), String::UTF8);
pos += vendorLength;
// Next the number of fields in the comment vector.
const uint commentFields = data.toUInt(pos, false);
pos += 4;
if(commentFields > (data.size() - 8) / 4) {
return;
}
for(uint i = 0; i < commentFields; i++) {
// Each comment field is in the format "KEY=value" in a UTF8 string and has
// 4 bytes before the text starts that gives the length.
const uint commentLength = data.toUInt(pos, false);
pos += 4;
String comment = String(data.mid(pos, commentLength), String::UTF8);
pos += commentLength;
if(pos > data.size()) {
break;
}
int commentSeparatorPosition = comment.find("=");
if(commentSeparatorPosition == -1) {
break;
}
String key = comment.substr(0, commentSeparatorPosition);
String value = comment.substr(commentSeparatorPosition + 1);
addField(key, value, false);
}
}
void Opus::Properties::read(File *file)
{
// Get the identification header from the Ogg implementation.
// http://tools.ietf.org/html/draft-terriberry-oggopus-01#section-5.1
const ByteVector data = file->packet(0);
// *Magic Signature*
uint pos = 8;
// *Version* (8 bits, unsigned)
d->opusVersion = uchar(data.at(pos));
pos += 1;
// *Output Channel Count* 'C' (8 bits, unsigned)
d->channels = uchar(data.at(pos));
pos += 1;
// *Pre-skip* (16 bits, unsigned, little endian)
const ushort preSkip = data.toUShort(pos, false);
pos += 2;
// *Input Sample Rate* (32 bits, unsigned, little endian)
d->inputSampleRate = data.toUInt(pos, false);
pos += 4;
// *Output Gain* (16 bits, signed, little endian)
pos += 2;
// *Channel Mapping Family* (8 bits, unsigned)
pos += 1;
const Ogg::PageHeader *first = file->firstPageHeader();
const Ogg::PageHeader *last = file->lastPageHeader();
if(first && last) {
const long long start = first->absoluteGranularPosition();
const long long end = last->absoluteGranularPosition();
if(start >= 0 && end >= 0) {
const long long frameCount = (end - start - preSkip);
if(frameCount > 0) {
const double length = frameCount * 1000.0 / 48000.0;
d->length = static_cast<int>(length + 0.5);
d->bitrate = static_cast<int>(file->length() * 8.0 / length + 0.5);
}
}
else {
debug("Opus::Properties::read() -- The PCM values for the start or "
"end of this file was incorrect.");
}
}
else
debug("Opus::Properties::read() -- Could not find valid first and last Ogg pages.");
}
void SynchronizedLyricsFrame::parseFields(const ByteVector &data)
{
const int end = data.size();
if(end < 7) {
debug("A synchronized lyrics frame must contain at least 7 bytes.");
return;
}
d->textEncoding = String::Type(data[0]);
d->language = data.mid(1, 3);
d->timestampFormat = TimestampFormat(data[4]);
d->type = Type(data[5]);
int pos = 6;
d->description = readStringField(data, d->textEncoding, &pos);
if(d->description.isEmpty())
return;
/*
* If UTF16 strings are found in SYLT frames, a BOM may only be
* present in the first string (content descriptor), and the strings of
* the synchronized text have no BOM. Here the BOM is read from
* the first string to have a specific encoding with endianness for the
* case of strings without BOM so that readStringField() will work.
*/
String::Type encWithEndianness = d->textEncoding;
if(d->textEncoding == String::UTF16) {
unsigned short bom = data.toUShort(6, true);
if(bom == 0xfffe) {
encWithEndianness = String::UTF16LE;
} else if(bom == 0xfeff) {
encWithEndianness = String::UTF16BE;
}
}
d->synchedText.clear();
while(pos < end) {
String::Type enc = d->textEncoding;
// If a UTF16 string has no BOM, use the encoding found above.
if(enc == String::UTF16 && pos + 1 < end) {
unsigned short bom = data.toUShort(pos, true);
if(bom != 0xfffe && bom != 0xfeff) {
enc = encWithEndianness;
}
}
String text = readStringField(data, enc, &pos);
if(text.isEmpty() || pos + 4 > end)
return;
unsigned int time = data.toUInt(pos, true);
pos += 4;
d->synchedText.append(SynchedText(time, text));
}
}
void RIFF::AIFF::Properties::read(const ByteVector &data)
{
d->channels = data.toShort(0U);
d->sampleFrames = data.toUInt(2U);
d->sampleWidth = data.toShort(6U);
double sampleRate = ConvertFromIeeeExtended(reinterpret_cast<const uchar *>(data.data() + 8));
d->sampleRate = (int)sampleRate;
d->bitrate = (int)((sampleRate * d->sampleWidth * d->channels) / 1000.0);
d->length = d->sampleRate > 0 ? d->sampleFrames / d->sampleRate : 0;
}
void RIFF::Info::Tag::parse(const ByteVector &data)
{
uint p = 4;
while(p < data.size()) {
const uint size = data.toUInt(p + 4, false);
d->fieldListMap[data.mid(p, 4)] = TagPrivate::stringHandler->parse(data.mid(p + 8, size));
p += ((size + 1) & ~1) + 8;
}
}
unsigned int ASF::File::readDWORD(bool *ok)
{
ByteVector v = readBlock(4);
if(v.size() != 4) {
if(ok) *ok = false;
return 0;
}
if(ok) *ok = true;
return v.toUInt(false);
}
void ChapterFrame::parseFields(const ByteVector &data)
{
unsigned int size = data.size();
if(size < 18) {
debug("A CHAP frame must contain at least 18 bytes (1 byte element ID "
"terminated by null and 4x4 bytes for start and end time and offset).");
return;
}
int pos = 0;
unsigned int embPos = 0;
d->elementID = readStringField(data, String::Latin1, &pos).data(String::Latin1);
d->startTime = data.toUInt(pos, true);
pos += 4;
d->endTime = data.toUInt(pos, true);
pos += 4;
d->startOffset = data.toUInt(pos, true);
pos += 4;
d->endOffset = data.toUInt(pos, true);
pos += 4;
size -= pos;
// Embedded frames are optional
if(size < header()->size())
return;
while(embPos < size - header()->size()) {
Frame *frame = FrameFactory::instance()->createFrame(data.mid(pos + embPos), (d->tagHeader != 0));
if(!frame)
return;
// Checks to make sure that frame parsed correctly.
if(frame->size() <= 0) {
delete frame;
return;
}
embPos += frame->size() + header()->size();
addEmbeddedFrame(frame);
}
}
void MPEG::VbriHeader::parse(const ByteVector &data)
{
// Check to see if a valid VBRI header is available.
if(!data.startsWith("VBRI"))
return;
d->size = data.toUInt(10, true);
d->frames = data.toUInt(14, true);
d->valid = true;
}
void APE::Properties::analyzeOld(File *file)
{
const ByteVector header = file->readBlock(26);
if(header.size() < 26) {
debug("APE::Properties::analyzeOld() -- MAC header is too short.");
return;
}
const unsigned int totalFrames = header.toUInt(18, false);
// Fail on 0 length APE files (catches non-finalized APE files)
if(totalFrames == 0)
return;
const short compressionLevel = header.toShort(0, false);
unsigned int blocksPerFrame;
if(d->version >= 3950)
blocksPerFrame = 73728 * 4;
else if(d->version >= 3900 || (d->version >= 3800 && compressionLevel == 4000))
blocksPerFrame = 73728;
else
blocksPerFrame = 9216;
// Get the APE info
d->channels = header.toShort(4, false);
d->sampleRate = header.toUInt(6, false);
const unsigned int finalFrameBlocks = header.toUInt(22, false);
d->sampleFrames = (totalFrames - 1) * blocksPerFrame + finalFrameBlocks;
// Get the bit depth from the RIFF-fmt chunk.
file->seek(16, File::Current);
const ByteVector fmt = file->readBlock(28);
if(fmt.size() < 28 || !fmt.startsWith("WAVEfmt ")) {
debug("APE::Properties::analyzeOld() -- fmt header is too short.");
return;
}
d->bitsPerSample = fmt.toShort(26, false);
}
void PopularimeterFrame::parseFields(const ByteVector &data)
{
int pos = 0, size = int(data.size());
d->email = readStringField(data, String::Latin1, &pos);
d->rating = 0;
d->counter = 0;
if(pos < size) {
d->rating = (unsigned char)(data[pos++]);
if(pos < size) {
d->counter = data.toUInt(static_cast<unsigned int>(pos));
}
}
}
bool FLAC::Picture::parse(const ByteVector &data)
{
if(data.size() < 32) {
debug("A picture block must contain at least 5 bytes.");
return false;
}
unsigned int pos = 0;
d->type = FLAC::Picture::Type(data.toUInt(pos));
pos += 4;
unsigned int mimeTypeLength = data.toUInt(pos);
pos += 4;
if(pos + mimeTypeLength + 24 > data.size()) {
debug("Invalid picture block.");
return false;
}
d->mimeType = String(data.mid(pos, mimeTypeLength), String::UTF8);
pos += mimeTypeLength;
unsigned int descriptionLength = data.toUInt(pos);
pos += 4;
if(pos + descriptionLength + 20 > data.size()) {
debug("Invalid picture block.");
return false;
}
d->description = String(data.mid(pos, descriptionLength), String::UTF8);
pos += descriptionLength;
d->width = data.toUInt(pos);
pos += 4;
d->height = data.toUInt(pos);
pos += 4;
d->colorDepth = data.toUInt(pos);
pos += 4;
d->numColors = data.toUInt(pos);
pos += 4;
unsigned int dataLength = data.toUInt(pos);
pos += 4;
if(pos + dataLength > data.size()) {
debug("Invalid picture block.");
return false;
}
d->data = data.mid(pos, dataLength);
return true;
}
MP4::Atom::Atom(File *file)
{
children.setAutoDelete(true);
offset = file->tell();
ByteVector header = file->readBlock(8);
if(header.size() != 8) {
// The atom header must be 8 bytes long, otherwise there is either
// trailing garbage or the file is truncated
debug("MP4: Couldn't read 8 bytes of data for atom header");
length = 0;
file->seek(0, File::End);
return;
}
length = header.toUInt();
if(length == 0) {
// The last atom which extends to the end of the file.
length = file->length() - offset;
}
else if(length == 1) {
// The atom has a 64-bit length.
const long long longLength = file->readBlock(8).toLongLong();
if(longLength <= LONG_MAX) {
// The actual length fits in long. That's always the case if long is 64-bit.
length = static_cast<long>(longLength);
}
else {
debug("MP4: 64-bit atoms are not supported");
length = 0;
file->seek(0, File::End);
return;
}
}
if(length < 8) {
debug("MP4: Invalid atom size");
length = 0;
file->seek(0, File::End);
return;
}
name = header.mid(4, 4);
for(int i = 0; i < numContainers; i++) {
if(name == containers[i]) {
if(name == "meta") {
file->seek(4, File::Current);
}
else if(name == "stsd") {
file->seek(8, File::Current);
}
while(file->tell() < offset + length) {
MP4::Atom *child = new MP4::Atom(file);
children.append(child);
if(child->length == 0)
return;
}
return;
}
}
file->seek(offset + length);
}
unsigned int ASF::File::readDWORD()
{
ByteVector v = readBlock(4);
return v.toUInt(false);
}
void Speex::Properties::read(File *file)
{
// Get the identification header from the Ogg implementation.
const ByteVector data = file->packet(0);
if(data.size() < 64) {
debug("Speex::Properties::read() -- data is too short.");
return;
}
unsigned int pos = 28;
// speex_version_id; /**< Version for Speex (for checking compatibility) */
d->speexVersion = data.toUInt(pos, false);
pos += 4;
// header_size; /**< Total size of the header ( sizeof(SpeexHeader) ) */
pos += 4;
// rate; /**< Sampling rate used */
d->sampleRate = data.toUInt(pos, false);
pos += 4;
// mode; /**< Mode used (0 for narrowband, 1 for wideband) */
d->mode = data.toUInt(pos, false);
pos += 4;
// mode_bitstream_version; /**< Version ID of the bit-stream */
pos += 4;
// nb_channels; /**< Number of channels encoded */
d->channels = data.toUInt(pos, false);
pos += 4;
// bitrate; /**< Bit-rate used */
d->bitrateNominal = data.toUInt(pos, false);
pos += 4;
// frame_size; /**< Size of frames */
// unsigned int frameSize = data.mid(pos, 4).toUInt(false);
pos += 4;
// vbr; /**< 1 for a VBR encoding, 0 otherwise */
d->vbr = data.toUInt(pos, false) == 1;
pos += 4;
// frames_per_packet; /**< Number of frames stored per Ogg packet */
// unsigned int framesPerPacket = data.mid(pos, 4).toUInt(false);
const Ogg::PageHeader *first = file->firstPageHeader();
const Ogg::PageHeader *last = file->lastPageHeader();
if(first && last) {
const long long start = first->absoluteGranularPosition();
const long long end = last->absoluteGranularPosition();
if(start >= 0 && end >= 0 && d->sampleRate > 0) {
const long long frameCount = end - start;
if(frameCount > 0) {
const double length = frameCount * 1000.0 / d->sampleRate;
d->length = static_cast<int>(length + 0.5);
d->bitrate = static_cast<int>(file->length() * 8.0 / length + 0.5);
}
}
else {
debug("Speex::Properties::read() -- Either the PCM values for the start or "
"end of this file was incorrect or the sample rate is zero.");
}
}
else
debug("Speex::Properties::read() -- Could not find valid first and last Ogg pages.");
// Alternative to the actual average bitrate.
if(d->bitrate == 0 && d->bitrateNominal > 0)
d->bitrate = static_cast<int>(d->bitrateNominal / 1000.0 + 0.5);
}
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;
}
}
void Frame::Header::setData(const ByteVector &data, uint version)
{
d->version = version;
switch(version) {
case 0:
case 1:
case 2:
{
// ID3v2.2
if(data.size() < 3) {
debug("You must at least specify a frame ID.");
return;
}
// Set the frame ID -- the first three bytes
d->frameID = data.mid(0, 3);
// If the full header information was not passed in, do not continue to the
// steps to parse the frame size and flags.
if(data.size() < 6) {
d->frameSize = 0;
return;
}
d->frameSize = data.toUInt(3, 3, true);
break;
}
case 3:
{
// ID3v2.3
if(data.size() < 4) {
debug("You must at least specify a frame ID.");
return;
}
// Set the frame ID -- the first four bytes
d->frameID = data.mid(0, 4);
// If the full header information was not passed in, do not continue to the
// steps to parse the frame size and flags.
if(data.size() < 10) {
d->frameSize = 0;
return;
}
// Set the size -- the frame size is the four bytes starting at byte four in
// the frame header (structure 4)
d->frameSize = data.toUInt(4U);
{ // read the first byte of flags
std::bitset<8> flags(data[8]);
d->tagAlterPreservation = flags[7]; // (structure 3.3.1.a)
d->fileAlterPreservation = flags[6]; // (structure 3.3.1.b)
d->readOnly = flags[5]; // (structure 3.3.1.c)
}
{ // read the second byte of flags
std::bitset<8> flags(data[9]);
d->compression = flags[7]; // (structure 3.3.1.i)
d->encryption = flags[6]; // (structure 3.3.1.j)
d->groupingIdentity = flags[5]; // (structure 3.3.1.k)
}
break;
}
case 4:
default:
{
// ID3v2.4
if(data.size() < 4) {
debug("You must at least specify a frame ID.");
return;
}
// Set the frame ID -- the first four bytes
d->frameID = data.mid(0, 4);
// If the full header information was not passed in, do not continue to the
// steps to parse the frame size and flags.
if(data.size() < 10) {
d->frameSize = 0;
return;
}
// Set the size -- the frame size is the four bytes starting at byte four in
// the frame header (structure 4)
d->frameSize = SynchData::toUInt(data.mid(4, 4));
#ifndef NO_ITUNES_HACKS
// iTunes writes v2.4 tags with v2.3-like frame sizes
if(d->frameSize > 127) {
if(!isValidFrameID(data.mid(d->frameSize + 10, 4))) {
unsigned int uintSize = data.toUInt(4U);
if(isValidFrameID(data.mid(uintSize + 10, 4))) {
d->frameSize = uintSize;
}
}
}
#endif
{ // read the first byte of flags
std::bitset<8> flags(data[8]);
d->tagAlterPreservation = flags[6]; // (structure 4.1.1.a)
d->fileAlterPreservation = flags[5]; // (structure 4.1.1.b)
d->readOnly = flags[4]; // (structure 4.1.1.c)
}
{ // read the second byte of flags
std::bitset<8> flags(data[9]);
d->groupingIdentity = flags[6]; // (structure 4.1.2.h)
d->compression = flags[3]; // (structure 4.1.2.k)
d->encryption = flags[2]; // (structure 4.1.2.m)
d->unsynchronisation = flags[1]; // (structure 4.1.2.n)
d->dataLengthIndicator = flags[0]; // (structure 4.1.2.p)
}
break;
}
}
}
void MPEG::Header::parse(File *file, long offset, bool checkLength)
{
file->seek(offset);
const ByteVector data = file->readBlock(4);
if(data.size() < 4) {
debug("MPEG::Header::parse() -- data is too short for an MPEG frame header.");
return;
}
// Check for the MPEG synch bytes.
if(!isFrameSync(data)) {
debug("MPEG::Header::parse() -- MPEG header did not match MPEG synch.");
return;
}
// Set the MPEG version
const int versionBits = (static_cast<unsigned char>(data[1]) >> 3) & 0x03;
if(versionBits == 0)
d->version = Version2_5;
else if(versionBits == 2)
d->version = Version2;
else if(versionBits == 3)
d->version = Version1;
else {
debug("MPEG::Header::parse() -- Invalid MPEG version bits.");
return;
}
// Set the MPEG layer
const int layerBits = (static_cast<unsigned char>(data[1]) >> 1) & 0x03;
if(layerBits == 1)
d->layer = 3;
else if(layerBits == 2)
d->layer = 2;
else if(layerBits == 3)
d->layer = 1;
else {
debug("MPEG::Header::parse() -- Invalid MPEG layer bits.");
return;
}
d->protectionEnabled = (static_cast<unsigned char>(data[1] & 0x01) == 0);
// Set the bitrate
static const int bitrates[2][3][16] = {
{ // Version 1
{ 0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448, 0 }, // layer 1
{ 0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384, 0 }, // layer 2
{ 0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 0 } // layer 3
},
{ // Version 2 or 2.5
{ 0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256, 0 }, // layer 1
{ 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, 0 }, // layer 2
{ 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, 0 } // layer 3
}
};
const int versionIndex = (d->version == Version1) ? 0 : 1;
const int layerIndex = (d->layer > 0) ? d->layer - 1 : 0;
// The bitrate index is encoded as the first 4 bits of the 3rd byte,
// i.e. 1111xxxx
const int bitrateIndex = (static_cast<unsigned char>(data[2]) >> 4) & 0x0F;
d->bitrate = bitrates[versionIndex][layerIndex][bitrateIndex];
if(d->bitrate == 0) {
debug("MPEG::Header::parse() -- Invalid bit rate.");
return;
}
// Set the sample rate
static const int sampleRates[3][4] = {
{ 44100, 48000, 32000, 0 }, // Version 1
{ 22050, 24000, 16000, 0 }, // Version 2
{ 11025, 12000, 8000, 0 } // Version 2.5
};
// The sample rate index is encoded as two bits in the 3nd byte, i.e. xxxx11xx
const int samplerateIndex = (static_cast<unsigned char>(data[2]) >> 2) & 0x03;
d->sampleRate = sampleRates[d->version][samplerateIndex];
if(d->sampleRate == 0) {
debug("MPEG::Header::parse() -- Invalid sample rate.");
return;
}
// The channel mode is encoded as a 2 bit value at the end of the 3nd byte,
// i.e. xxxxxx11
d->channelMode = static_cast<ChannelMode>((static_cast<unsigned char>(data[3]) >> 6) & 0x03);
// TODO: Add mode extension for completeness
d->isOriginal = ((static_cast<unsigned char>(data[3]) & 0x04) != 0);
d->isCopyrighted = ((static_cast<unsigned char>(data[3]) & 0x08) != 0);
d->isPadded = ((static_cast<unsigned char>(data[2]) & 0x02) != 0);
// Samples per frame
static const int samplesPerFrame[3][2] = {
// MPEG1, 2/2.5
{ 384, 384 }, // Layer I
{ 1152, 1152 }, // Layer II
{ 1152, 576 } // Layer III
};
d->samplesPerFrame = samplesPerFrame[layerIndex][versionIndex];
// Calculate the frame length
static const int paddingSize[3] = { 4, 1, 1 };
d->frameLength = d->samplesPerFrame * d->bitrate * 125 / d->sampleRate;
if(d->isPadded)
d->frameLength += paddingSize[layerIndex];
if(checkLength) {
// Check if the frame length has been calculated correctly, or the next frame
// header is right next to the end of this frame.
// The MPEG versions, layers and sample rates of the two frames should be
// consistent. Otherwise, we assume that either or both of the frames are
// broken.
file->seek(offset + d->frameLength);
const ByteVector nextData = file->readBlock(4);
if(nextData.size() < 4) {
debug("MPEG::Header::parse() -- Could not read the next frame header.");
return;
}
const unsigned int HeaderMask = 0xfffe0c00;
const unsigned int header = data.toUInt(0, true) & HeaderMask;
const unsigned int nextHeader = nextData.toUInt(0, true) & HeaderMask;
if(header != nextHeader) {
debug("MPEG::Header::parse() -- The next frame was not consistent with this frame.");
return;
}
}
// Now that we're done parsing, set this to be a valid frame.
d->isValid = true;
}
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;
}
void Ogg::FLAC::File::scan()
{
// Scan the metadata pages
if(d->scanned)
return;
if(!isValid())
return;
int ipacket = 0;
long overhead = 0;
ByteVector metadataHeader = packet(ipacket);
if(metadataHeader.isEmpty())
return;
if(!metadataHeader.startsWith("fLaC")) {
// FLAC 1.1.2+
if(metadataHeader.mid(1, 4) != "FLAC")
return;
if(metadataHeader[5] != 1)
return; // not version 1
metadataHeader = metadataHeader.mid(13);
}
else {
// FLAC 1.1.0 & 1.1.1
metadataHeader = packet(++ipacket);
}
ByteVector header = metadataHeader.mid(0, 4);
if(header.size() != 4) {
debug("Ogg::FLAC::File::scan() -- Invalid Ogg/FLAC metadata header");
return;
}
// Header format (from spec):
// <1> Last-metadata-block flag
// <7> BLOCK_TYPE
// 0 : STREAMINFO
// 1 : PADDING
// ..
// 4 : VORBIS_COMMENT
// ..
// <24> Length of metadata to follow
char blockType = header[0] & 0x7f;
bool lastBlock = (header[0] & 0x80) != 0;
uint length = header.toUInt(1, 3, true);
overhead += length;
// Sanity: First block should be the stream_info metadata
if(blockType != 0) {
debug("Ogg::FLAC::File::scan() -- Invalid Ogg/FLAC stream");
return;
}
d->streamInfoData = metadataHeader.mid(4, length);
// Search through the remaining metadata
while(!lastBlock) {
metadataHeader = packet(++ipacket);
header = metadataHeader.mid(0, 4);
if(header.size() != 4) {
debug("Ogg::FLAC::File::scan() -- Invalid Ogg/FLAC metadata header");
return;
}
blockType = header[0] & 0x7f;
lastBlock = (header[0] & 0x80) != 0;
length = header.toUInt(1, 3, true);
overhead += length;
if(blockType == 1) {
// debug("Ogg::FLAC::File::scan() -- Padding found");
}
else if(blockType == 4) {
// debug("Ogg::FLAC::File::scan() -- Vorbis-comments found");
d->xiphCommentData = metadataHeader.mid(4, length);
d->hasXiphComment = true;
d->commentPacket = ipacket;
}
else if(blockType > 5) {
debug("Ogg::FLAC::File::scan() -- Unknown metadata block");
}
}
// End of metadata, now comes the datastream
d->streamStart = overhead;
d->streamLength = File::length() - d->streamStart;
d->scanned = true;
}
void RIFF::WAV::Properties::read(File *file)
{
ByteVector data;
uint streamLength = 0;
uint totalSamples = 0;
for(uint i = 0; i < file->chunkCount(); ++i) {
const ByteVector name = file->chunkName(i);
if(name == "fmt ") {
if(data.isEmpty())
data = file->chunkData(i);
else
debug("RIFF::WAV::Properties::read() - Duplicate 'fmt ' chunk found.");
}
else if(name == "data") {
if(streamLength == 0)
streamLength = file->chunkDataSize(i) + file->chunkPadding(i);
else
debug("RIFF::WAV::Properties::read() - Duplicate 'data' chunk found.");
}
else if(name == "fact") {
if(totalSamples == 0)
totalSamples = file->chunkData(i).toUInt(0, false);
else
debug("RIFF::WAV::Properties::read() - Duplicate 'fact' chunk found.");
}
}
if(data.size() < 16) {
debug("RIFF::WAV::Properties::read() - 'fmt ' chunk not found or too short.");
return;
}
if(streamLength == 0) {
debug("RIFF::WAV::Properties::read() - 'data' chunk not found.");
return;
}
d->format = data.toShort(0, false);
if(d->format != FORMAT_PCM && totalSamples == 0) {
debug("RIFF::WAV::Properties::read() - Non-PCM format, but 'fact' chunk not found.");
return;
}
d->channels = data.toShort(2, false);
d->sampleRate = data.toUInt(4, false);
d->bitsPerSample = data.toShort(14, false);
if(totalSamples > 0)
d->sampleFrames = totalSamples;
else if(d->channels > 0 && d->bitsPerSample > 0)
d->sampleFrames = streamLength / (d->channels * ((d->bitsPerSample + 7) / 8));
if(d->sampleFrames > 0 && d->sampleRate > 0) {
const double length = d->sampleFrames * 1000.0 / d->sampleRate;
d->length = static_cast<int>(length + 0.5);
d->bitrate = static_cast<int>(streamLength * 8.0 / length + 0.5);
}
else {
const uint byteRate = data.toUInt(8, false);
if(byteRate > 0) {
d->length = static_cast<int>(streamLength * 1000.0 / byteRate + 0.5);
d->bitrate = static_cast<int>(byteRate * 8.0 / 1000.0 + 0.5);
}
}
}
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));
}
}
}
}
uint read(TagLib::File &file, uint limit)
{
ByteVector data = file.readBlock(std::min(4U,limit));
value = data.toUInt(bigEndian);
return data.size();
}
