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 ID3v2::Tag::parse(const ByteVector &data) { uint frameDataPosition = 0; uint frameDataLength = data.size(); // check for extended header if(d->header.extendedHeader()) { if(!d->extendedHeader) d->extendedHeader = new ExtendedHeader; d->extendedHeader->setData(data); if(d->extendedHeader->size() <= data.size()) { frameDataPosition += d->extendedHeader->size(); frameDataLength -= d->extendedHeader->size(); } } // check for footer -- we don't actually need to parse it, as it *must* // contain the same data as the header, but we do need to account for its // size. if(d->header.footerPresent() && Footer::size() <= frameDataLength) frameDataLength -= Footer::size(); // parse frames // Make sure that there is at least enough room in the remaining frame data for // a frame header. while(frameDataPosition < frameDataLength - Frame::headerSize(d->header.majorVersion())) { // If the next data is position is 0, assume that we've hit the padding // portion of the frame data. if(data.at(frameDataPosition) == 0) { if(d->header.footerPresent()) debug("Padding *and* a footer found. This is not allowed by the spec."); d->paddingSize = frameDataLength - frameDataPosition; return; } Frame *frame = d->factory->createFrame(data.mid(frameDataPosition), d->header.majorVersion()); if(!frame) return; // Checks to make sure that frame parsed correctly. if(frame->size() <= 0) { delete frame; return; } frameDataPosition += frame->size() + Frame::headerSize(d->header.majorVersion()); addFrame(frame); } }
void TableOfContentsFrame::parseFields(const ByteVector &data) { TagLib::uint size = data.size(); if(size < 6) { debug("A CTOC frame must contain at least 6 bytes (1 byte element ID terminated by " "null, 1 byte flags, 1 byte entry count and 1 byte child element ID terminated " "by null."); return; } int pos = 0; TagLib::uint embPos = 0; d->elementID = readStringField(data, String::Latin1, &pos).data(String::Latin1); d->isTopLevel = (data.at(pos) & 2) > 0; d->isOrdered = (data.at(pos++) & 1) > 0; TagLib::uint entryCount = data.at(pos++); for(TagLib::uint i = 0; i < entryCount; i++) { ByteVector childElementID = readStringField(data, String::Latin1, &pos).data(String::Latin1); d->childElements.append(childElementID); } size -= pos; if(size < header()->size()) return; while(embPos < size - header()->size()) { Frame *frame = FrameFactory::instance()->createFrame(data.mid(pos + embPos), d->tagHeader); 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); } }
/*----------------------------------------------------------------------------*/ bool DDAProtocol :: txPacket() { ByteVector txData; if(m_txData.size()) txData = m_txData[0]; if(txData.empty()) return false; unsigned size = txData.size(); serial_write(m_serial, &txData.at(0), size); return 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; } }
void ChapterFrame::setElementID(const ByteVector &eID) { d->elementID = eID; if(eID.at(eID.size() - 1) != char(0)) d->elementID.append(char(0)); }
void ID3v2::Tag::parse(const ByteVector &origData) { ByteVector data = origData; if(d->header.unsynchronisation() && d->header.majorVersion() <= 3) data = SynchData::decode(data); uint frameDataPosition = 0; uint frameDataLength = data.size(); // check for extended header if(d->header.extendedHeader()) { if(!d->extendedHeader) d->extendedHeader = new ExtendedHeader; d->extendedHeader->setData(data); if(d->extendedHeader->size() <= data.size()) { frameDataPosition += d->extendedHeader->size(); frameDataLength -= d->extendedHeader->size(); } } // check for footer -- we don't actually need to parse it, as it *must* // contain the same data as the header, but we do need to account for its // size. if(d->header.footerPresent() && Footer::size() <= frameDataLength) frameDataLength -= Footer::size(); // parse frames // Make sure that there is at least enough room in the remaining frame data for // a frame header. while(frameDataPosition < frameDataLength - Frame::headerSize(d->header.majorVersion())) { // If the next data is position is 0, assume that we've hit the padding // portion of the frame data. if(data.at(frameDataPosition) == 0) { if(d->header.footerPresent()) { debug("Padding *and* a footer found. This is not allowed by the spec."); } d->paddingSize = frameDataLength - frameDataPosition; return; } Frame *frame = d->factory->createFrame(data.mid(frameDataPosition), &d->header); if(!frame) return; frameDataPosition += frame->size() + Frame::headerSize(d->header.majorVersion()); // Checks to make sure that frame parsed correctly. // (windows media player tends to write null byte frames // even though the spec forbids it // We delete those frames because they are mostly broken // (e.g. no null termination) if(frame->size() <= 0) { delete frame; } else { addFrame(frame); } } }
void TableOfContentsFrame::setElementID(const ByteVector &eID) { d->elementID = eID; if(eID.at(eID.size() - 1) != char(0)) d->elementID.append(char(0)); }
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; } }