470 lines
16 KiB
C++
470 lines
16 KiB
C++
/***************************************************************************
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copyright : (C) 2002 - 2008 by Scott Wheeler
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email : wheeler@kde.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., 51 Franklin Street, Fifth Floor, Boston, MA *
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* 02110-1301 USA *
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* *
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* Alternatively, this file is available under the Mozilla Public *
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* License Version 1.1. You may obtain a copy of the License at *
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* http://www.mozilla.org/MPL/ *
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***************************************************************************/
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#ifndef TAGLIB_ID3V2FRAME_H
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#define TAGLIB_ID3V2FRAME_H
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#include "tstring.h"
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#include "tbytevector.h"
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#include "taglib_export.h"
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namespace Strawberry_TagLib {
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namespace TagLib {
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class StringList;
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class PropertyMap;
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namespace ID3v2 {
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class Tag;
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class FrameFactory;
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//! ID3v2 frame implementation
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/*!
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* This class is the main ID3v2 frame implementation.
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* In ID3v2, a tag is split between a collection of frames (which are in turn split into fields
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* (Structure, <a href="id3v2-structure.html#4">4</a>)
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* (<a href="id3v2-frames.html">Frames</a>).
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* This class provides an API for gathering information about and modifying ID3v2 frames.
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* Funtionallity specific to a given frame type is handed in one of the many subclasses.
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*/
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class TAGLIB_EXPORT Frame {
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friend class Tag;
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friend class FrameFactory;
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public:
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/*!
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* Creates a textual frame which corresponds to a single key in the PropertyMap interface.
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* These are all (User)TextIdentificationFrames except TIPL and TMCL, all (User)URLLinkFrames, CommentsFrames, and UnsynchronizedLyricsFrame.
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*/
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static Frame *createTextualFrame(const String &key, const StringList &values);
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/*!
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* Destroys this Frame instance.
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*/
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virtual ~Frame();
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/*!
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* Returns the Frame ID (Structure, <a href="id3v2-structure.html#4">4</a>)
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* (Frames, <a href="id3v2-frames.html#4">4</a>)
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*/
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ByteVector frameID() const;
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/*!
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* Returns the size of the frame.
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*/
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unsigned int size() const;
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/*!
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* Returns the size of the frame header
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*
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* \deprecated This is only accurate for ID3v2.3 or ID3v2.4.
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* Please use the call below which accepts an ID3v2 version number.
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* In the next non-binary compatible release this will be made into a non-static member that checks the internal ID3v2 version.
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*/
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static unsigned int headerSize(); // BIC: make non-static
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/*!
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* Returns the size of the frame header for the given ID3v2 version.
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*
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* \deprecated Please see the explanation above.
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*/
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// BIC: remove
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static unsigned int headerSize(unsigned int version);
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/*!
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* Sets the data that will be used as the frame.
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* Since the length is not known before the frame has been parsed,
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* this should just be a pointer to the first byte of the frame.
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* It will determine the length internally and make that available through size().
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*/
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void setData(const ByteVector &data);
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/*!
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* Set the text of frame in the sanest way possible.
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* This should only be reimplemented in frames where there is some logical mapping to text.
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*
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* \note If the frame type supports multiple text encodings,
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* this will not change the text encoding of the frame; the string will be converted to that frame's encoding.
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* Please use the specific APIs of the frame types to set the encoding if that is desired.
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*/
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virtual void setText(const String &text);
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/*!
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* This returns the textual representation of the data in the frame.
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* Subclasses must reimplement this method to provide a string representation of the frame's data.
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*/
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virtual String toString() const = 0;
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/*!
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* Render the frame back to its binary format in a ByteVector.
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*/
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ByteVector render() const;
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/*!
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* Returns the text delimiter that is used between fields for the string type \a t.
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*/
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static ByteVector textDelimiter(String::Type t);
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/*!
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* The string with which an instrument name is prefixed to build a key in a PropertyMap; used to translate PropertyMaps to TMCL frames.
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* In the current implementation, this is "PERFORMER:".
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*/
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static const String instrumentPrefix;
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/*!
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* The PropertyMap key prefix which triggers the use of a COMM frame instead of a TXXX frame for a non-standard key.
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* In the current implementation, this is "COMMENT:".
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*/
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static const String commentPrefix;
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/*!
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* The PropertyMap key prefix which triggers the use of a USLT frame instead of a TXXX frame for a non-standard key.
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* In the current implementation, this is "LYRICS:".
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*/
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static const String lyricsPrefix;
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/*!
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* The PropertyMap key prefix which triggers the use of a WXXX frame instead of a TXX frame for a non-standard key.
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* In the current implementation, this is "URL:".
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*/
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static const String urlPrefix;
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protected:
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class Header;
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/*!
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* Constructs an ID3v2 frame using \a data to read the header information.
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* All other processing of \a data should be handled in a subclass.
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*
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* \note This need not contain anything more than a frame ID, but \e must contain at least that.
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*/
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explicit Frame(const ByteVector &data);
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/*!
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* This creates an Frame using the header \a h.
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*
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* The ownership of this header will be assigned to the frame and the header will be deleted when the frame is destroyed.
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*/
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Frame(Header *h);
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/*!
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* Returns a pointer to the frame header.
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*/
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Header *header() const;
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/*!
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* Sets the header to \a h. If \a deleteCurrent is true, this will free the memory of the current header.
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*
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* The ownership of this header will be assigned to the frame and the header will be deleted when the frame is destroyed.
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*/
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void setHeader(Header *h, bool deleteCurrent = true);
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/*!
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* Called by setData() to parse the frame data. It makes this information available through the public API.
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*/
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void parse(const ByteVector &data);
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/*!
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* Called by parse() to parse the field data.
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* It makes this information available through the public API. This must be overridden by the subclasses.
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*/
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virtual void parseFields(const ByteVector &data) = 0;
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/*!
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* Render the field data back to a binary format in a ByteVector. This must be overridden by subclasses.
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*/
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virtual ByteVector renderFields() const = 0;
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/*!
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* Returns a ByteVector containing the field data given the frame data.
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* This correctly adjusts for the header size plus any additional frame data that's specified in the frame header flags.
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*/
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ByteVector fieldData(const ByteVector &frameData) const;
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/*!
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* Reads a String of type \a encoding from the ByteVector \a data.
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* If \a position is passed in it is used both as the starting point and is updated to return the position just after the string that has been read.
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* This is useful for reading strings sequentially.
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*/
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String readStringField(const ByteVector &data, String::Type encoding, int *position = 0);
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/*!
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* Checks a the list of string values to see if they can be used with the specified encoding and returns the recommended encoding.
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*/
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// BIC: remove and make non-static
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static String::Type checkEncoding(const StringList &fields, String::Type encoding);
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/*!
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* Checks a the list of string values to see if they can be used with the specified encoding and returns the recommended encoding.
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* This method also checks the ID3v2 version and makes sure the encoding can be used in the specified version.
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*/
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// BIC: remove and make non-static
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static String::Type checkEncoding(const StringList &fields, String::Type encoding, unsigned int version);
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/*!
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* Checks a the list of string values to see if they can be used with the specified encoding and returns the recommended encoding.
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* This method also checks the ID3v2 version and makes sure the encoding can be used in the version specified by the frame's header.
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*/
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String::Type checkTextEncoding(const StringList &fields, String::Type encoding) const;
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/*!
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* Parses the contents of this frame as PropertyMap.
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* If that fails, the returned PropertyMap will be empty, and its unsupportedData() will contain this frame's ID.
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* BIC: Will be a virtual function in future releases.
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*/
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PropertyMap asProperties() const;
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/*!
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* Returns an appropriate ID3 frame ID for the given free-form tag key. This method
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* will return an empty ByteVector if no specialized translation is found.
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*/
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static ByteVector keyToFrameID(const String &);
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/*!
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* Returns a free-form tag name for the given ID3 frame ID.
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* Note that this does not work for general frame IDs such as TXXX or WXXX; in such a case an empty string is returned.
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*/
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static String frameIDToKey(const ByteVector &);
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/*!
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* Returns an appropriate TXXX frame description for the given free-form tag key.
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*/
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static String keyToTXXX(const String &);
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/*!
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* Returns a free-form tag name for the given ID3 frame description.
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*/
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static String txxxToKey(const String &);
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/*!
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* This helper function splits the PropertyMap \a original into three ProperytMaps
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* \a singleFrameProperties, \a tiplProperties, and \a tmclProperties, such that:
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* - \a singleFrameProperties contains only of keys which can be represented with exactly one ID3 frame per key.
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* In the current implementation this is everything except for the fixed "involved people" keys and keys of the
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* form "TextIdentificationFrame::instrumentPrefix" + "instrument", which are mapped to a TMCL frame.
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* - \a tiplProperties will consist of those keys that are present in TextIdentificationFrame::involvedPeopleMap()
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* - \a tmclProperties contains the "musician credits" keys which should be mapped to a TMCL frame
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*/
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static void splitProperties(const PropertyMap &original, PropertyMap &singleFrameProperties, PropertyMap &tiplProperties, PropertyMap &tmclProperties);
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private:
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Frame(const Frame &);
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Frame &operator=(const Frame &);
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class FramePrivate;
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friend class FramePrivate;
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FramePrivate *d;
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};
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//! ID3v2 frame header implementation
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/*!
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* The ID3v2 Frame Header (Structure, <a href="id3v2-structure.html#4">4</a>)
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*
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* Every ID3v2::Frame has an associated header that gives some general
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* properties of the frame and also makes it possible to identify the frame type.
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*
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* As such when reading an ID3v2 tag ID3v2::FrameFactory first creates the
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* frame headers and then creates the appropriate Frame subclass based on the type and attaches the header.
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*/
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class TAGLIB_EXPORT Frame::Header {
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public:
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/*!
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* Construct a Frame Header based on \a data. \a data must at least
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* contain a 4 byte frame ID, and optionally can contain flag data and the frame size.
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* i.e. Just the frame id -- "TALB" -- is a valid value.
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*
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* \a version should be the ID3v2 version of the tag.
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*/
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explicit Header(const ByteVector &data, unsigned int version = 4);
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/*!
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* Destroys this Header instance.
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*/
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virtual ~Header();
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/*!
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* Sets the data for the Header.
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*
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* \deprecated Please use the version below that accepts an ID3v2 version
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* number.
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*/
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void setData(const ByteVector &data, bool synchSafeInts);
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/*!
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* Sets the data for the Header.
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* \a version should indicate the ID3v2 version number of the tag that this frame is contained in.
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*/
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void setData(const ByteVector &data, unsigned int version = 4);
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/*!
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* Returns the Frame ID (Structure, <a href="id3v2-structure.html#4">4</a>)
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* (Frames, <a href="id3v2-frames.html#4">4</a>)
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*/
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ByteVector frameID() const;
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/*!
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* Sets the frame's ID to \a id. Only the first four bytes of \a id will be used.
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*
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* \warning This method should in general be avoided. It exists simply to
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* provide a mechanism for transforming frames from a deprecated frame type
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* to a newer one -- i.e. TYER to TDRC from ID3v2.3 to ID3v2.4.
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*/
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void setFrameID(const ByteVector &id);
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/*!
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* Returns the size of the frame data portion, as set when setData() was called or set explicitly via setFrameSize().
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*/
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unsigned int frameSize() const;
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/*!
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* Sets the size of the frame data portion.
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*/
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void setFrameSize(unsigned int size);
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/*!
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* Returns the ID3v2 version of the header, as passed in from the construction of the header or set via setVersion().
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*/
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unsigned int version() const;
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/*!
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* Sets the ID3v2 version of the header, changing has impact on the correct parsing/rendering of frame data.
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*/
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void setVersion(unsigned int version);
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/*!
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* Returns the size of the frame header in bytes.
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*
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* \deprecated Please use the version of this method that accepts a
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* version. This is only accurate for ID3v2.3 and ID3v2.4. This will be
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* removed in the next binary incompatible release (2.0) and will be
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* replaced with a non-static method that checks the frame version.
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*/
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// BIC: make non-static
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static unsigned int size();
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/*!
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* Returns the size of the frame header in bytes for the ID3v2 version
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* that's given.
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*
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* \deprecated Please see the explanation in the version above.
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*/
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// BIC: remove
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static unsigned int size(unsigned int version);
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/*!
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* Returns true if the flag for tag alter preservation is set.
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*
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* The semantics are a little backwards from what would seem natural
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* (setting the preservation flag to throw away the frame), but this
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* follows the ID3v2 standard.
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*
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* \see setTagAlterPreservation()
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*/
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bool tagAlterPreservation() const;
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/*!
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* Sets the flag for preservation of this frame if the tag is set. If
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* this is set to true the frame will not be written when the tag is
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* saved.
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*
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* The semantics are a little backwards from what would seem natural
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* (setting the preservation flag to throw away the frame), but this
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* follows the ID3v2 standard.
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*
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* \see tagAlterPreservation()
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*/
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void setTagAlterPreservation(bool preserve);
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/*!
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* Returns true if the flag for file alter preservation is set.
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*
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* \note This flag is currently ignored internally in TagLib.
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*/
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bool fileAlterPreservation() const;
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/*!
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* Returns true if the frame is meant to be read only.
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*
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* \note This flag is currently ignored internally in TagLib.
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*/
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bool readOnly() const;
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/*!
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* Returns true if the flag for the grouping identity is set.
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*
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* \note This flag is currently ignored internally in TagLib.
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*/
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bool groupingIdentity() const;
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/*!
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* Returns true if compression is enabled for this frame.
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*
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* \note This flag is currently ignored internally in TagLib.
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*/
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bool compression() const;
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/*!
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* Returns true if encryption is enabled for this frame.
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*
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* \note This flag is currently ignored internally in TagLib.
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*/
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bool encryption() const;
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#ifndef DO_NOT_DOCUMENT
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bool unsycronisation() const;
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#endif
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/*!
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* Returns true if unsynchronisation is enabled for this frame.
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*/
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bool unsynchronisation() const;
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/*!
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* Returns true if the flag for a data length indicator is set.
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*/
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bool dataLengthIndicator() const;
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/*!
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* Render the Header back to binary format in a ByteVector.
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*/
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ByteVector render() const;
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private:
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Header(const Header &);
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Header &operator=(const Header &);
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class HeaderPrivate;
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HeaderPrivate *d;
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};
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} // namespace ID3v2
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} // namespace TagLib
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} // namespace Strawberry_TagLib
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#endif
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