MetaIOMP4 Class Reference

Read and write metadata in MP4 container tags. More...

#include <libmythmetadata/metaiomp4.h>

Inheritance diagram for MetaIOMP4:

Collaboration diagram for MetaIOMP4:

Public Member Functions
	MetaIOMP4 (void)=default
	~MetaIOMP4 (void) override=default
bool	write (const QString &filename, MusicMetadata *mdata) override
	Writes all metadata back to a file. More...
MusicMetadata *	read (const QString &filename) override
	Reads MusicMetadata from a file. More...
Public Member Functions inherited from MetaIO
	MetaIO (void)
virtual	~MetaIO (void)=default
virtual bool	writeVolatileMetadata ([[maybe_unused]] const QString &filename, [[maybe_unused]] MusicMetadata *mdata)
	Writes rating and playcount back to a file. More...
virtual bool	supportsEmbeddedImages (void)
	Does the tag support embedded cover art. More...
virtual AlbumArtList	getAlbumArtList ([[maybe_unused]] const QString &filename)
	Reads the list of embedded images in the tag. More...
virtual bool	writeAlbumArt ([[maybe_unused]] const QString &filename, [[maybe_unused]] const AlbumArtImage *albumart)
virtual bool	removeAlbumArt ([[maybe_unused]] const QString &filename, [[maybe_unused]] const AlbumArtImage *albumart)
virtual bool	changeImageType ([[maybe_unused]] const QString &filename, [[maybe_unused]] const AlbumArtImage *albumart, [[maybe_unused]] ImageType newType)
virtual QImage *	getAlbumArt ([[maybe_unused]] const QString &filename, [[maybe_unused]] ImageType type)
void	readFromFilename (const QString &filename, QString &artist, QString &album, QString &title, QString &genre, int &tracknum)
	Reads MusicMetadata based on the folder/filename. More...
MusicMetadata *	readFromFilename (const QString &filename, bool blnLength=false)
	Reads MusicMetadata based on the folder/filename. More...
void	readFromFilename (MusicMetadata *metadata)
	Reads MusicMetadata based on the folder/filename. More...
virtual bool	TagExists ([[maybe_unused]] const QString &filename)

Private Member Functions
std::chrono::milliseconds	getTrackLength (const QString &filename) override
	Find the length of the track (in milliseconds) More...

Static Private Member Functions
static QString	getFieldValue (AVFormatContext *context, const char *tagname)
	Retrieve the value of a named metadata field. More...
static void	metadataSanityCheck (QString *artist, QString *album, QString *title, QString *genre)
	Replace any empty strings in extracted metadata with sane defaults. More...

Additional Inherited Members
Static Public Member Functions inherited from MetaIO
static MetaIO *	createTagger (const QString &filename)
	Finds an appropriate tagger for the given file. More...
static MusicMetadata *	readMetadata (const QString &filename)
	Read the metadata from filename directly. More...
static MusicMetadata *	getMetadata (const QString &filename)
	Get the metadata for filename. More...
Static Public Attributes inherited from MetaIO
static const QString	kValidFileExtensions
Protected Member Functions inherited from MetaIO
void	saveTimeStamps (void)
void	restoreTimeStamps (void)
Protected Attributes inherited from MetaIO
QString	m_filename
QString	m_filenameFormat

Detailed Description

Read and write metadata in MP4 container tags.

Definition at line 16 of file metaiomp4.h.

Constructor & Destructor Documentation

MetaIOMP4()

MetaIOMP4::MetaIOMP4 ( void  )

default

~MetaIOMP4()

MetaIOMP4::~MetaIOMP4 ( void  )

overridedefault

Member Function Documentation

write()

bool MetaIOMP4::write ( const QString &  filename, MusicMetadata *  mdata  )

overridevirtual

Writes all metadata back to a file.

Parameters

filename	The filename to write metadata to
mdata	A pointer to a MusicMetadata object

Returns

Boolean to indicate success/failure.

Implements MetaIO.

Definition at line 19 of file metaiomp4.cpp.

read()

MusicMetadata * MetaIOMP4::read ( const QString &  filename )

overridevirtual

Reads MusicMetadata from a file.

Parameters

filename

The filename to read metadata from.

Returns

MusicMetadata pointer or nullptr on error

Implements MetaIO.

Definition at line 70 of file metaiomp4.cpp.

getTrackLength()

std::chrono::milliseconds MetaIOMP4::getTrackLength ( const QString &  filename )

overrideprivatevirtual

Find the length of the track (in milliseconds)

Parameters

filename

The filename for which we want to find the length.

Returns

An integer (signed!) to represent the length in milliseconds.

Implements MetaIO.

Definition at line 169 of file metaiomp4.cpp.

getFieldValue()

QString MetaIOMP4::getFieldValue ( AVFormatContext *  context, const char *  tagname  )

staticprivate

Retrieve the value of a named metadata field.

Parameters

context	AVFormatContext of the file
tagname	The name of the field

Returns

A string containing the requested value

Definition at line 151 of file metaiomp4.cpp.

Referenced by read().

metadataSanityCheck()

void MetaIOMP4::metadataSanityCheck ( QString *  artist, QString *  album, QString *  title, QString *  genre  )

staticprivate

Replace any empty strings in extracted metadata with sane defaults.

Parameters

artist	Artist
album	Album
title	Title
genre	Genre

Definition at line 201 of file metaiomp4.cpp.

Referenced by read().

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The documentation for this class was generated from the following files:

• mythtv/libs/libmythmetadata/metaiomp4.h
• mythtv/libs/libmythmetadata/metaiomp4.cpp