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/***************************************************************************
copyright : (C) 2003 by Ismael Orenstein
email : orenstein@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., 51 Franklin Street, Fifth Floor, Boston, MA *
* 02110-1301 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/ *
***************************************************************************/
#ifndef TAGLIB_XINGHEADER_H
#define TAGLIB_XINGHEADER_H
#include "mpegheader.h"
#include "taglib_export.h"
namespace TagLib {
class ByteVector;
namespace MPEG {
class File;
//! An implementation of the Xing/VBRI headers
/*!
* This is a minimalistic implementation of the Xing/VBRI VBR headers.
* Xing/VBRI headers are often added to VBR (variable bit rate) MP3 streams
* to make it easy to compute the length and quality of a VBR stream. Our
* implementation is only concerned with the total size of the stream (so
* that we can calculate the total playing time and the average bitrate).
* It uses <a href="http://home.pcisys.net/~melanson/codecs/mp3extensions.txt">
* this text</a> and the XMMS sources as references.
*/
class TAGLIB_EXPORT XingHeader
{
public:
/*!
* The type of the VBR header.
*/
enum HeaderType
{
/*!
* Invalid header or no VBR header found.
*/
Invalid = 0,
/*!
* Xing header.
*/
Xing = 1,
/*!
* VBRI header.
*/
VBRI = 2,
};
/*!
* Parses an Xing/VBRI header based on \a data which contains the entire
* first MPEG frame.
*/
XingHeader(const ByteVector &data);
/*!
* Destroy this XingHeader instance.
*/
virtual ~XingHeader();
/*!
* Returns true if the data was parsed properly and if there is a valid
* Xing/VBRI header present.
*/
bool isValid() const;
/*!
* Returns the total number of frames.
*/
unsigned int totalFrames() const;
/*!
* Returns the total size of stream in bytes.
*/
unsigned int totalSize() const;
/*!
* Returns the type of the VBR header.
*/
HeaderType type() const;
/*!
* Returns the offset for the start of this Xing header, given the
* version and channels of the frame
*
* \deprecated Always returns 0.
*/
static int xingHeaderOffset(TagLib::MPEG::Header::Version v,
TagLib::MPEG::Header::ChannelMode c);
private:
XingHeader(const XingHeader &);
XingHeader &operator=(const XingHeader &);
void parse(const ByteVector &data);
class XingHeaderPrivate;
XingHeaderPrivate *d;
};
}
}
#endif
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