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/***************************************************************************
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., 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_MPEGHEADER_H
#define TAGLIB_MPEGHEADER_H
#include "taglib_export.h"
namespace TagLib {
class ByteVector;
namespace MPEG {
//! An implementation of MP3 frame headers
/*!
* This is an implementation of MPEG Layer III headers. The API follows more
* or less the binary format of these headers. I've used
* <a href="http://www.mp3-tech.org/programmer/frame_header.html">this</a>
* document as a reference.
*/
class TAGLIB_EXPORT Header
{
public:
/*!
* Parses an MPEG header based on \a data.
*/
Header(const ByteVector &data);
/*!
* Does a shallow copy of \a h.
*/
Header(const Header &h);
/*!
* Destroys this Header instance.
*/
virtual ~Header();
/*!
* Returns true if the frame is at least an appropriate size and has
* legal values.
*/
bool isValid() const;
/*!
* The MPEG Version.
*/
enum Version {
//! MPEG Version 1
Version1 = 0,
//! MPEG Version 2
Version2 = 1,
//! MPEG Version 2.5
Version2_5 = 2
};
/*!
* Returns the MPEG Version of the header.
*/
Version version() const;
/*!
* Returns the layer version. This will be between the values 1-3.
*/
int layer() const;
/*!
* Returns true if the MPEG protection bit is enabled.
*/
bool protectionEnabled() const;
/*!
* Returns the bitrate encoded in the header.
*/
int bitrate() const;
/*!
* Returns the sample rate in Hz.
*/
int sampleRate() const;
/*!
* Returns true if the frame is padded.
*/
bool isPadded() const;
/*!
* There are a few combinations or one or two channel audio that are
* possible:
*/
enum ChannelMode {
//! Stereo
Stereo = 0,
//! Stereo
JointStereo = 1,
//! Dual Mono
DualChannel = 2,
//! Mono
SingleChannel = 3
};
/*!
* Returns the channel mode for this frame.
*/
ChannelMode channelMode() const;
/*!
* Returns true if the copyrighted bit is set.
*/
bool isCopyrighted() const;
/*!
* Returns true if the "original" bit is set.
*/
bool isOriginal() const;
/*!
* Returns the frame length.
*/
int frameLength() const;
/*!
* Returns the number of frames per sample.
*/
int samplesPerFrame() const;
/*!
* Makes a shallow copy of the header.
*/
Header &operator=(const Header &h);
private:
void parse(const ByteVector &data);
class HeaderPrivate;
HeaderPrivate *d;
};
}
}
#endif