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Scott Wheeler
2004-02-17 02:11:05 +00:00
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/***************************************************************************
copyright : (C) 2002, 2003 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 *
***************************************************************************/
#ifndef TAGLIB_MPEGFILE_H
#define TAGLIB_MPEGFILE_H
#include <tfile.h>
#include "mpegproperties.h"
namespace TagLib {
namespace ID3v2 { class Tag; class FrameFactory; }
namespace ID3v1 { class Tag; }
//! An implementation of TagLib::File with MPEG (MP3) specific methods
namespace MPEG {
//! An MPEG file class with some useful methods specific to MPEG
/*!
* This implements the generic TagLib::File API and additionally provides
* access to properties that are distinct to MPEG files, notably access
* to the different ID3 tags.
*/
class File : public TagLib::File
{
public:
/*!
* This set of flags is used for various operations and is suitable for
* being OR-ed together.
*/
enum TagTypes {
//! Empty set. Matches no tag types.
NoTags = 0x0000,
//! Matches ID3v1 tags.
ID3v1 = 0x0001,
//! Matches ID3v2 tags.
ID3v2 = 0x0002,
//! Matches all tag types.
AllTags = 0xffff
};
/*!
* Contructs an MPEG file from \a file. If \a readProperties is true the
* file's audio properties will also be read using \a propertiesStyle. If
* false, \a propertiesStyle is ignored.
*/
File(const char *file, bool readProperties = true,
Properties::ReadStyle propertiesStyle = Properties::Average);
/*!
* Destroys this instance of the File.
*/
virtual ~File();
/*!
* Returns a pointer to a tag that is the union of the ID3v2 and ID3v1
* tags. The ID3v2 tag is given priority in reading the information -- if
* requested information exists in both the ID3v2 tag and the ID3v1 tag,
* the information from the ID3v2 tag will be returned.
*
* If you would like more granular control over the content of the tags,
* with the concession of generality, use the tag-type specific calls.
*
* \note As this tag is not implemented as an ID3v2 tag or an ID3v1 tag,
* but a union of the two this pointer may not be cast to the specific
* tag types.
*
* \see ID3v1Tag()
* \see ID3v2Tag()
*/
virtual Tag *tag() const;
/*!
* Returns the MPEG::Properties for this file. If no audio properties
* were read then this will return a null pointer.
*/
virtual Properties *audioProperties() const;
/*!
* Save the file. If at least one tag -- ID3v1 or ID3v2 -- exists this
* will duplicate its content into the other tag.
*
* If neither exists or if both tags are empty, this will strip the tags
* from the file.
*
* This is the same as calling save(AllTags);
*
* If you would like more granular control over the content of the tags,
* with the concession of generality, use paramaterized save call below.
*
* \see save(int tags)
*/
virtual void save();
/*!
* Save the file. This will attempt to save all of the tag types that are
* specified by OR-ing together TagTypes values. The save() method above
* uses AllTags.
*
* This strips all tags not included in the mask, but does not modify them
* in memory, so later calls to save() which make use of these tags will
* remain valid. This also strips empty tags.
*/
void save(int tags);
/*!
* Returns a pointer to the ID3v2 tag of the file.
*
* This method will return a null pointer if either the file can not be
* read from.
*
* If \a create is false (the default) it will also return a null pointer
* if there is no valid ID3v2 tag. If \a create is true it will create
* an ID3v2 tag if one does not exist.
*
* \note The Tag <b>is still</b> owned by the MPEG::File and should not be
* deleted by the user. It will be deleted when the file (object) is
* destroyed.
*/
ID3v2::Tag *ID3v2Tag(bool create = false);
/*!
* Returns a pointer to the ID3v1 tag of the file.
*
* This method will return a null pointer if either the file can not be
* read from.
*
* If \a create is false (the default) it will also return a null pointer
* if there is no valid ID3v1 tag. If \a create is true it will create
* an ID3v1 tag if one does not exist.
*
* \note The Tag <b>is still</b> owned by the MPEG::File and should not be
* deleted by the user. It will be deleted when the file (object) is
* destroyed.
*/
ID3v1::Tag *ID3v1Tag(bool create = false);
/*!
* This will strip the tags that match the OR-ed together TagTypes from the
* file. By default it strips all tags.
*/
void strip(int tags = AllTags);
/*!
* Set the ID3v2::FrameFactory to something other than the default.
*
* \see ID3v2FrameFactory
*/
void setID3v2FrameFactory(const ID3v2::FrameFactory *factory);
/*!
* Returns the position in the file of the first MPEG frame.
*/
long firstFrameOffset();
/*!
* Returns the position in the file of the next MPEG frame,
* using the current position as start
*/
long nextFrameOffset(long position);
/*!
* Returns the position in the file of the previous MPEG frame,
* using the current position as start
*/
long previousFrameOffset(long position);
/*!
* Returns the position in the file of the last MPEG frame.
*/
long lastFrameOffset();
private:
File(const File &);
File &operator=(const File &);
void read(bool readProperties, Properties::ReadStyle propertiesStyle);
long findID3v2();
long findID3v1();
/*!
* MPEG frames can be recognized by the bit pattern 11111111 111, so the
* first byte is easy to check for, however checking to see if the second byte
* starts with \e 111 is a bit more tricky, hence this member function.
*/
static bool secondSynchByte(char byte);
class FilePrivate;
FilePrivate *d;
};
}
}
#endif