130 lines
4.4 KiB
C++
130 lines
4.4 KiB
C++
/***************************************************************************
|
|
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_AUDIOPROPERTIES_H
|
|
#define TAGLIB_AUDIOPROPERTIES_H
|
|
|
|
#include "taglib_export.h"
|
|
|
|
namespace Strawberry_TagLib {
|
|
namespace TagLib {
|
|
|
|
//! A simple, abstract interface to common audio properties
|
|
|
|
/*!
|
|
* The values here are common to most audio formats. For more specific, codec
|
|
* dependent values, please see see the subclasses APIs. This is meant to
|
|
* compliment the Strawberry_TagLib::TagLib::File and Strawberry_TagLib::TagLib::Tag APIs in providing a simple
|
|
* interface that is sufficient for most applications.
|
|
*/
|
|
|
|
class TAGLIB_EXPORT AudioProperties
|
|
{
|
|
public:
|
|
|
|
/*!
|
|
* Reading audio properties from a file can sometimes be very time consuming
|
|
* and for the most accurate results can often involve reading the entire
|
|
* file. Because in many situations speed is critical or the accuracy of the
|
|
* values is not particularly important this allows the level of desired
|
|
* accuracy to be set.
|
|
*/
|
|
enum ReadStyle {
|
|
//! Read as little of the file as possible
|
|
Fast,
|
|
//! Read more of the file and make better values guesses
|
|
Average,
|
|
//! Read as much of the file as needed to report accurate values
|
|
Accurate
|
|
};
|
|
|
|
/*!
|
|
* Destroys this AudioProperties instance.
|
|
*/
|
|
virtual ~AudioProperties();
|
|
|
|
/*!
|
|
* Returns the length of the file in seconds.
|
|
*/
|
|
virtual int length() const = 0;
|
|
|
|
/*!
|
|
* Returns the length of the file in seconds. The length is rounded down to
|
|
* the nearest whole second.
|
|
*
|
|
* \see lengthInMilliseconds()
|
|
*/
|
|
// BIC: make virtual
|
|
int lengthInSeconds() const;
|
|
|
|
/*!
|
|
* Returns the length of the file in milliseconds.
|
|
*
|
|
* \see lengthInSeconds()
|
|
*/
|
|
// BIC: make virtual
|
|
int lengthInMilliseconds() const;
|
|
|
|
/*!
|
|
* Returns the most appropriate bit rate for the file in kb/s. For constant
|
|
* bitrate formats this is simply the bitrate of the file. For variable
|
|
* bitrate formats this is either the average or nominal bitrate.
|
|
*/
|
|
virtual int bitrate() const = 0;
|
|
|
|
/*!
|
|
* Returns the sample rate in Hz.
|
|
*/
|
|
virtual int sampleRate() const = 0;
|
|
|
|
/*!
|
|
* Returns the number of audio channels.
|
|
*/
|
|
virtual int channels() const = 0;
|
|
|
|
protected:
|
|
|
|
/*!
|
|
* Construct an audio properties instance. This is protected as this class
|
|
* should not be instantiated directly, but should be instantiated via its
|
|
* subclasses and can be fetched from the FileRef or File APIs.
|
|
*
|
|
* \see ReadStyle
|
|
*/
|
|
AudioProperties(ReadStyle style);
|
|
|
|
private:
|
|
AudioProperties(const AudioProperties &);
|
|
AudioProperties &operator=(const AudioProperties &);
|
|
|
|
class AudioPropertiesPrivate;
|
|
AudioPropertiesPrivate *d;
|
|
};
|
|
|
|
}
|
|
}
|
|
|
|
#endif
|