AudioSourceVector< FileType > Class Template Reference

Flexible Audio Data Source using a Vector of (file) names with minimal RAM usage. Files are stored with separated path index and name to minimize memory consumption. Identical paths are stored only once in a shared path registry. This class is a template to support multiple SD libraries and other Streams. More...

#include <AudioSource.h>

Inheritance diagram for AudioSourceVector< FileType >:

Public Types
typedef FileType *(*	FileToStreamCallback) (const char *path, FileType &oldFile)

Public Member Functions
	AudioSourceVector (FileToStreamCallback callback)
	Constructor with callback for file to stream conversion.
void	addName (const char *nameWithPath) override
	Add a file with full path (path and name will be separated automatically)
template<typename T , size_t N>
void	addNames (T(&nameArray)[N])
	Add multiple files at once.
bool	begin () override
	Reset actual stream and move to root.
void	clear ()
	Clear all files and path registry.
bool	deleteIndex (size_t idx)
	Remove a file by index.
bool	deleteName (const char *nameWithPath)
	Remove a file by full path.
FileType &	getCurrentFile ()
	Get the current file reference for use in callback.
virtual int	index () override
	Returns the actual index of the stream.
int	indexOf (const char *path)
	Find index of file by path.
virtual bool	isAutoNext ()
	Returns default setting go to the next.
bool	isEmpty ()
	Check if empty.
const char *	name (int index)
	provides the name at the given index
virtual FileType *	nextStream (int offset) override
	Returns next audio stream.
Stream *	operator[] (int idx)
	access with array syntax
virtual Stream *	previousStream (int offset)
	Returns previous audio stream.
virtual FileType *	selectStream (const char *path) override
	Returns audio stream by path.
virtual FileType *	selectStream (int index) override
	Returns audio stream at the indicated index.
virtual Stream *	setIndex (int index)
	same as selectStream - I just prefer this name
virtual bool	setMetadataCallback (void(*fn)(MetaDataType info, const char *str, int len), ID3TypeSelection sel=SELECT_ICY)
void	setNameToStreamCallback (FileToStreamCallback callback)
	Set the callback for converting file path to stream.
virtual void	setTimeout (int millisec)
	Sets the timeout of Stream in milliseconds.
virtual void	setTimeoutAutoNext (int millisec)
int	size ()
	Get the number of files.
virtual int	timeoutAutoNext ()
	Provides the timeout which is triggering to move to the next stream.
virtual const char *	toStr () override
	provides the actual stream (e.g. file) name or url

Protected Member Functions
int	findOrAddPath (const char *path)
	Find existing path in registry or add new one, returns index.
FileEntry &	getFileEntry (int index) const
	Get file entry at index.
Str	getFullPath (int index)
	Get full path of file at index.
const char *	getPath (int pathIndex)
	Get path from registry at index.

Protected Attributes
int	current_index = 0
Str	current_path
FileType *	current_stream = nullptr
Vector< FileEntry >	files
FileToStreamCallback	nameToStreamCallback = nullptr
Vector< Str >	path_registry
int	timeout_auto_next_value = 500

Detailed Description

template<typename FileType>
class audio_tools::AudioSourceVector< FileType >

Flexible Audio Data Source using a Vector of (file) names with minimal RAM usage. Files are stored with separated path index and name to minimize memory consumption. Identical paths are stored only once in a shared path registry. This class is a template to support multiple SD libraries and other Streams.

Note

A mandatory callback function must be provided to convert a file path (and optionally an old file instance) into a stream or file object. This callback is set via the constructor or setNameToStreamCallback().

Example callback signature: FileType* callback(const char* path, FileType& oldFile);

Without this callback, the class cannot open or access files for playback. Also don't forget to close the old file to prevent any memory leaks.

Author

Phil Schatzmann

Copyright

GPLv3

Member Function Documentation

addName()

template<typename FileType >

void addName ( const char *  nameWithPath )

inlineoverridevirtual

Add a file with full path (path and name will be separated automatically)

Implements PathNamesRegistry.

begin()

template<typename FileType >

bool begin ( )

inlineoverridevirtual

Reset actual stream and move to root.

Implements AudioSource.

index()

template<typename FileType >

virtual int index ( )

inlineoverridevirtual

Returns the actual index of the stream.

Reimplemented from AudioSource.

isAutoNext()

virtual bool isAutoNext ( )

inlinevirtualinherited

Returns default setting go to the next.

Reimplemented in AudioSourceIdxSD, AudioSourceIdxSDFAT< AudioFs, AudioFile >, AudioSourceIdxSDMMC, AudioSourceLittleFS, AudioSourceSD, AudioSourceSDFAT< AudioFs, AudioFile >, AudioSourceSDMMC, AudioSourceSPIFFS, AudioSourceSTD, AudioSourceURL, AudioSourceVFS, AudioSourceSDFAT< AudioFs, AudioFile >, and AudioSourceCallback.

nextStream()

template<typename FileType >

virtual FileType * nextStream ( int  offset )

inlineoverridevirtual

Returns next audio stream.

Implements AudioSource.

previousStream()

virtual Stream * previousStream ( int  offset )

inlinevirtualinherited

Returns previous audio stream.

Reimplemented in AudioSourceFTP< ClientType >, and AudioSourceURL.

selectStream() [1/2]

template<typename FileType >

virtual FileType * selectStream ( const char *  path )

inlineoverridevirtual

Returns audio stream by path.

Implements AudioSource.

selectStream() [2/2]

template<typename FileType >

virtual FileType * selectStream ( int  index )

inlineoverridevirtual

Returns audio stream at the indicated index.

Reimplemented from AudioSource.

setTimeout()

virtual void setTimeout ( int  millisec )

inlinevirtualinherited

Sets the timeout of Stream in milliseconds.

Reimplemented in AudioSourceURL, and AudioSourceSDFAT< AudioFs, AudioFile >.

setTimeoutAutoNext()

virtual void setTimeoutAutoNext ( int  millisec )

inlinevirtualinherited

Sets the timeout which is triggering to move to the next stream. - the default value is 500 ms

toStr()

template<typename FileType >

virtual const char * toStr ( )

inlineoverridevirtual

provides the actual stream (e.g. file) name or url

Reimplemented from AudioSource.

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

• src/AudioTools/Disk/AudioSource.h