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This commit is contained in:
Scott Wheeler
380
flac/flacfile.cpp
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380
flac/flacfile.cpp
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/***************************************************************************
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copyright : (C) 2003 by Allan Sandfeld Jensen
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email : kde@carewolf.org
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***************************************************************************/
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/***************************************************************************
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* This library is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU Lesser General Public License version *
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* 2.1 as published by the Free Software Foundation. *
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* *
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* This library is distributed in the hope that it will be useful, but *
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* WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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* Lesser General Public License for more details. *
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* *
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* You should have received a copy of the GNU Lesser General Public *
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* License along with this library; if not, write to the Free Software *
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *
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* USA *
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***************************************************************************/
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#include <tbytevector.h>
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#include <tstring.h>
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#include <tdebug.h>
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#include <id3v2header.h>
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#include "flacfile.h"
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#include "flactag.h"
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using namespace TagLib;
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class FLAC::File::FilePrivate
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{
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public:
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FilePrivate() :
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ID3v2FrameFactory(ID3v2::FrameFactory::instance()),
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ID3v2Tag(0),
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ID3v2Location(-1),
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ID3v2OriginalSize(0),
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ID3v1Tag(0),
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ID3v1Location(-1),
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comment(0),
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properties(0),
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flacStart(0),
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streamStart(0),
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streamLength(0),
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scanned(false),
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hasXiphComment(false),
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hasID3v2(false),
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hasID3v1(false) {}
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~FilePrivate()
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{
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delete ID3v2Tag;
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delete ID3v1Tag;
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delete comment;
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delete properties;
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}
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const ID3v2::FrameFactory *ID3v2FrameFactory;
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ID3v2::Tag *ID3v2Tag;
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long ID3v2Location;
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uint ID3v2OriginalSize;
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ID3v1::Tag *ID3v1Tag;
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long ID3v1Location;
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Ogg::XiphComment *comment;
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FLAC::Tag *tag;
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Properties *properties;
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ByteVector streamInfoData;
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ByteVector xiphCommentData;
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long flacStart;
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long streamStart;
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long streamLength;
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bool scanned;
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bool hasXiphComment;
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bool hasID3v2;
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bool hasID3v1;
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};
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////////////////////////////////////////////////////////////////////////////////
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// public members
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////////////////////////////////////////////////////////////////////////////////
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FLAC::File::File(const char *file, bool readProperties,
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Properties::ReadStyle propertiesStyle) : TagLib::File(file)
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{
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d = new FilePrivate;
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read(readProperties, propertiesStyle);
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}
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FLAC::File::~File()
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{
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delete d;
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}
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TagLib::Tag *FLAC::File::tag() const
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{
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return d->tag;
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}
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FLAC::Properties *FLAC::File::audioProperties() const
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{
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return d->properties;
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}
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void FLAC::File::save()
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{
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// Create new vorbis comments
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if(!d->comment) {
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d->comment = new Ogg::XiphComment;
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if(d->tag)
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Tag::duplicate(d->tag, d->comment, true);
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}
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d->xiphCommentData = d->comment->render();
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ByteVector v = ByteVector::fromUInt(d->xiphCommentData.size());
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// Set the type of the comment to be a Xiph / Vorbis comment
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// (See scan() for comments on header-format)
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v[0] = 4;
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v.append(d->xiphCommentData);
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// If file already have comment => find and update it
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// if not => insert one
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// TODO: Search for padding and use that
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if(d->hasXiphComment) {
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long nextPageOffset = d->flacStart;
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seek(nextPageOffset);
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ByteVector header = readBlock(4);
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uint length = header.mid(1, 3).toUInt();
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nextPageOffset += length + 4;
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// Search through the remaining metadata
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char blocktype = header[0] & 0x7f;
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bool lastblock = header[0] & 0x80;
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while(!lastblock) {
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seek(nextPageOffset);
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header = readBlock(4);
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blocktype = header[0] & 0x7f;
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lastblock = header[0] & 0x80;
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length = header.mid(1, 3).toUInt();
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// Type is vorbiscomment
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if( blocktype == 4 ) {
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v[0] = header[0];
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insert(v, nextPageOffset, length + 4);
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break;
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}
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nextPageOffset += length + 4;
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}
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}
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else {
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long nextPageOffset = d->flacStart;
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seek(nextPageOffset);
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ByteVector header = readBlock(4);
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// char blockType = header[0] & 0x7f;
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bool lastBlock = header[0] & 0x80;
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uint length = header.mid(1, 3).toUInt();
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// If last block was last, make this one last
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if(lastBlock) {
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// Copy the bottom seven bits into the new value
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ByteVector h(static_cast<char>(header[0] & 0x7F));
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insert(h, nextPageOffset, 1);
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// Set the last bit
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v[0] |= 0x80;
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}
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insert(v, nextPageOffset + length + 4, 0);
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d->hasXiphComment = true;
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}
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// Update ID3 tag
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if(d->hasID3v2 && d->ID3v2Tag)
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insert(d->ID3v2Tag->render(), d->ID3v2Location, d->ID3v2OriginalSize);
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if(d->hasID3v1 && d->ID3v1Tag) {
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seek(-128, End);
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writeBlock(d->ID3v1Tag->render());
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}
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}
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void FLAC::File::setID3v2FrameFactory(const ID3v2::FrameFactory *factory)
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{
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d->ID3v2FrameFactory = factory;
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}
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////////////////////////////////////////////////////////////////////////////////
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// private members
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////////////////////////////////////////////////////////////////////////////////
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void FLAC::File::read(bool readProperties, Properties::ReadStyle propertiesStyle)
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{
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// Look for an ID3v2 tag
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d->ID3v2Location = findID3v2();
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if(d->ID3v2Location >= 0) {
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d->ID3v2Tag = new ID3v2::Tag(this, d->ID3v2Location, d->ID3v2FrameFactory);
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d->ID3v2OriginalSize = d->ID3v2Tag->header()->completeTagSize();
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if(d->ID3v2Tag->header()->tagSize() <= 0) {
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delete d->ID3v2Tag;
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d->ID3v2Tag = 0;
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}
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else
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d->hasID3v2 = true;
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}
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// Look for an ID3v1 tag
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d->ID3v1Location = findID3v1();
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if(d->ID3v1Location >= 0) {
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d->ID3v1Tag = new ID3v1::Tag(this, d->ID3v1Location);
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d->hasID3v1 = true;
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}
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// Look for FLAC metadata, including vorbis comments
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scan();
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if(d->hasXiphComment)
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d->comment = new Ogg::XiphComment(xiphCommentData());
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if(d->hasXiphComment || d->hasID3v2 || d->hasID3v1)
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d->tag = new FLAC::Tag(d->comment, d->ID3v2Tag, d->ID3v1Tag);
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else
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d->tag = new FLAC::Tag(new Ogg::XiphComment);
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if(readProperties)
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d->properties = new Properties(this, propertiesStyle);
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}
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ByteVector FLAC::File::streamInfoData()
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{
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scan();
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return d->streamInfoData;
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}
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ByteVector FLAC::File::xiphCommentData()
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{
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scan();
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return d->xiphCommentData;
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}
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long FLAC::File::streamLength()
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{
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return d->streamLength;
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}
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void FLAC::File::scan()
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{
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// Scan the metadata pages
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if(d->scanned)
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return;
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if(!isValid())
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return;
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// Optimization: Use ID3v2 size and only skip that
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long nextPageOffset = find("fLaC");
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if(nextPageOffset < 0) {
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debug("FLAC::File::scan() -- FLAC stream not found");
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return;
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}
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nextPageOffset += 4;
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d->flacStart = nextPageOffset;
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seek(nextPageOffset);
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ByteVector header = readBlock(4);
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// Header format (from spec):
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// <1> Last-metadata-block flag
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// <7> BLOCK_TYPE
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// 0 : STREAMINFO
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// 1 : PADDING
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// ..
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// 4 : VORBIS_COMMENT
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// ..
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// <24> Length of metadata to follow
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char blockType = header[0] & 0x7f;
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bool lastBlock = header[0] & 0x80;
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uint length = header.mid(1, 3).toUInt();
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// First block should be the stream_info metadata
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if(blockType != 0) {
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debug("FLAC::File::scan() -- invalid FLAC stream");
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return;
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}
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d->streamInfoData = readBlock(length);
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nextPageOffset += length + 4;
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// Search through the remaining metadata
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while(!lastBlock) {
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header = readBlock(4);
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blockType = header[0] & 0x7f;
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lastBlock = header[0] & 0x80;
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length = header.mid(1, 3).toUInt();
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// Found the vorbis-comment
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if(blockType == 4) {
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d->xiphCommentData = readBlock(length);
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d->hasXiphComment = true;
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}
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nextPageOffset += length + 4;
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seek(nextPageOffset);
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}
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// End of metadata, now comes the datastream
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d->streamStart = nextPageOffset;
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d->streamLength = File::length() - d->streamStart;
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d->scanned = true;
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}
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long FLAC::File::findID3v1()
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{
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if(!isValid())
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return -1;
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seek(-128, End);
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long p = tell();
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if(readBlock(3) == ID3v1::Tag::fileIdentifier())
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return p;
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return -1;
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}
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long FLAC::File::findID3v2()
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{
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if(!isValid())
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return -1;
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seek(0);
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if(readBlock(3) == ID3v2::Header::fileIdentifier())
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return 0;
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return -1;
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}
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