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Diffstat (limited to 'libs/taglib/taglib/ogg/oggpage.cpp')
| -rw-r--r-- | libs/taglib/taglib/ogg/oggpage.cpp | 256 |
1 files changed, 256 insertions, 0 deletions
diff --git a/libs/taglib/taglib/ogg/oggpage.cpp b/libs/taglib/taglib/ogg/oggpage.cpp new file mode 100644 index 0000000000..0b82828467 --- /dev/null +++ b/libs/taglib/taglib/ogg/oggpage.cpp @@ -0,0 +1,256 @@ +/*************************************************************************** + copyright : (C) 2002 - 2008 by Scott Wheeler + email : wheeler@kde.org + ***************************************************************************/ + +/*************************************************************************** + * This library is free software; you can redistribute it and/or modify * + * it under the terms of the GNU Lesser General Public License version * + * 2.1 as published by the Free Software Foundation. * + * * + * This library is distributed in the hope that it will be useful, but * + * WITHOUT ANY WARRANTY; without even the implied warranty of * + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * + * Lesser General Public License for more details. * + * * + * You should have received a copy of the GNU Lesser General Public * + * License along with this library; if not, write to the Free Software * + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 * + * USA * + * * + * Alternatively, this file is available under the Mozilla Public * + * License Version 1.1. You may obtain a copy of the License at * + * http://www.mozilla.org/MPL/ * + ***************************************************************************/ + +#include <tstring.h> +#include <tdebug.h> + +#include "oggpage.h" +#include "oggpageheader.h" +#include "oggfile.h" + +using namespace TagLib; + +class Ogg::Page::PagePrivate +{ +public: + PagePrivate(File *f = 0, long pageOffset = -1) : + file(f), + fileOffset(pageOffset), + packetOffset(0), + header(f, pageOffset), + firstPacketIndex(-1) + { + if(file) { + packetOffset = fileOffset + header.size(); + packetSizes = header.packetSizes(); + dataSize = header.dataSize(); + } + } + + File *file; + long fileOffset; + long packetOffset; + int dataSize; + List<int> packetSizes; + PageHeader header; + int firstPacketIndex; + ByteVectorList packets; +}; + +//////////////////////////////////////////////////////////////////////////////// +// public members +//////////////////////////////////////////////////////////////////////////////// + +Ogg::Page::Page(Ogg::File *file, long pageOffset) +{ + d = new PagePrivate(file, pageOffset); +} + +Ogg::Page::~Page() +{ + delete d; +} + +long Ogg::Page::fileOffset() const +{ + return d->fileOffset; +} + +const Ogg::PageHeader *Ogg::Page::header() const +{ + return &d->header; +} + +int Ogg::Page::firstPacketIndex() const +{ + return d->firstPacketIndex; +} + +void Ogg::Page::setFirstPacketIndex(int index) +{ + d->firstPacketIndex = index; +} + +Ogg::Page::ContainsPacketFlags Ogg::Page::containsPacket(int index) const +{ + int lastPacketIndex = d->firstPacketIndex + packetCount() - 1; + if(index < d->firstPacketIndex || index > lastPacketIndex) + return DoesNotContainPacket; + + ContainsPacketFlags flags = DoesNotContainPacket; + + if(index == d->firstPacketIndex) + flags = ContainsPacketFlags(flags | BeginsWithPacket); + + if(index == lastPacketIndex) + flags = ContainsPacketFlags(flags | EndsWithPacket); + + // If there's only one page and it's complete: + + if(packetCount() == 1 && + !d->header.firstPacketContinued() && + d->header.lastPacketCompleted()) + { + flags = ContainsPacketFlags(flags | CompletePacket); + } + + // Or if the page is (a) the first page and it's complete or (b) the last page + // and it's complete or (c) a page in the middle. + + else if((flags & BeginsWithPacket && !d->header.firstPacketContinued()) || + (flags & EndsWithPacket && d->header.lastPacketCompleted()) || + (!(flags & BeginsWithPacket) && !(flags & EndsWithPacket))) + { + flags = ContainsPacketFlags(flags | CompletePacket); + } + + return flags; +} + +TagLib::uint Ogg::Page::packetCount() const +{ + return d->header.packetSizes().size(); +} + +ByteVectorList Ogg::Page::packets() const +{ + if(!d->packets.isEmpty()) + return d->packets; + + ByteVectorList l; + + if(d->file && d->header.isValid()) { + + d->file->seek(d->packetOffset); + + List<int> packetSizes = d->header.packetSizes(); + + List<int>::ConstIterator it = packetSizes.begin(); + for(; it != packetSizes.end(); ++it) + l.append(d->file->readBlock(*it)); + } + else + debug("Ogg::Page::packets() -- attempting to read packets from an invalid page."); + + return l; +} + +int Ogg::Page::size() const +{ + return d->header.size() + d->header.dataSize(); +} + +ByteVector Ogg::Page::render() const +{ + ByteVector data; + + data.append(d->header.render()); + + if(d->packets.isEmpty()) { + if(d->file) { + d->file->seek(d->packetOffset); + data.append(d->file->readBlock(d->dataSize)); + } + else + debug("Ogg::Page::render() -- this page is empty!"); + } + else { + ByteVectorList::ConstIterator it = d->packets.begin(); + for(; it != d->packets.end(); ++it) + data.append(*it); + } + + // Compute and set the checksum for the Ogg page. The checksum is taken over + // the entire page with the 4 bytes reserved for the checksum zeroed and then + // inserted in bytes 22-25 of the page header. + + ByteVector checksum = ByteVector::fromUInt(data.checksum(), false); + for(int i = 0; i < 4; i++) + data[i + 22] = checksum[i]; + + return data; +} + +List<Ogg::Page *> Ogg::Page::paginate(const ByteVectorList &packets, + PaginationStrategy strategy, + uint streamSerialNumber, + int firstPage, + bool firstPacketContinued, + bool lastPacketCompleted, + bool containsLastPacket) +{ + List<Page *> l; + + int totalSize = 0; + + for(ByteVectorList::ConstIterator it = packets.begin(); it != packets.end(); ++it) + totalSize += (*it).size(); + + if(strategy == Repaginate || totalSize + packets.size() > 255 * 256) { + debug("Ogg::Page::paginate() -- Sorry! Repagination is not yet implemented."); + return l; + } + + // TODO: Handle creation of multiple pages here with appropriate pagination. + + Page *p = new Page(packets, streamSerialNumber, firstPage, firstPacketContinued, + lastPacketCompleted, containsLastPacket); + l.append(p); + + return l; +} + +//////////////////////////////////////////////////////////////////////////////// +// protected members +//////////////////////////////////////////////////////////////////////////////// + +Ogg::Page::Page(const ByteVectorList &packets, + uint streamSerialNumber, + int pageNumber, + bool firstPacketContinued, + bool lastPacketCompleted, + bool containsLastPacket) +{ + d = new PagePrivate; + + ByteVector data; + List<int> packetSizes; + + d->header.setFirstPageOfStream(pageNumber == 0 && !firstPacketContinued); + d->header.setLastPageOfStream(containsLastPacket); + d->header.setFirstPacketContinued(firstPacketContinued); + d->header.setLastPacketCompleted(lastPacketCompleted); + d->header.setStreamSerialNumber(streamSerialNumber); + d->header.setPageSequenceNumber(pageNumber); + + // Build a page from the list of packets. + + for(ByteVectorList::ConstIterator it = packets.begin(); it != packets.end(); ++it) { + packetSizes.append((*it).size()); + data.append(*it); + } + d->packets = packets; + d->header.setPacketSizes(packetSizes); +} |