Streamed music played from an audio file. More...

#include <Music.hpp>

Inheritance diagram for sf::Music:

Classes
struct	Span
	Structure defining a time range using the template type. More...

Public Types
typedef Span< Time >	TimeSpan

enum	Status { Stopped, Paused, Playing }
	Enumeration of the sound source states. More...

Public Member Functions
	Music ()
	Default constructor. More...

	~Music ()
	Destructor. More...

bool	openFromFile (const std::string &filename)
	Open a music from an audio file. More...

bool	openFromMemory (const void *data, std::size_t sizeInBytes)
	Open a music from an audio file in memory. More...

bool	openFromStream (InputStream &stream)
	Open a music from an audio file in a custom stream. More...

Time	getDuration () const
	Get the total duration of the music. More...

TimeSpan	getLoopPoints () const
	Get the positions of the of the sound's looping sequence. More...

void	setLoopPoints (TimeSpan timePoints)
	Sets the beginning and end of the sound's looping sequence using sf::Time. More...

void	play ()
	Start or resume playing the audio stream. More...

void	pause ()
	Pause the audio stream. More...

void	stop ()
	Stop playing the audio stream. More...

unsigned int	getChannelCount () const
	Return the number of channels of the stream. More...

unsigned int	getSampleRate () const
	Get the stream sample rate of the stream. More...

Status	getStatus () const
	Get the current status of the stream (stopped, paused, playing) More...

void	setPlayingOffset (Time timeOffset)
	Change the current playing position of the stream. More...

Time	getPlayingOffset () const
	Get the current playing position of the stream. More...

void	setLoop (bool loop)
	Set whether or not the stream should loop after reaching the end. More...

bool	getLoop () const
	Tell whether or not the stream is in loop mode. More...

void	setPitch (float pitch)
	Set the pitch of the sound. More...

void	setVolume (float volume)
	Set the volume of the sound. More...

void	setPosition (float x, float y, float z)
	Set the 3D position of the sound in the audio scene. More...

void	setPosition (const Vector3f &position)
	Set the 3D position of the sound in the audio scene. More...

void	setRelativeToListener (bool relative)
	Make the sound's position relative to the listener or absolute. More...

void	setMinDistance (float distance)
	Set the minimum distance of the sound. More...

void	setAttenuation (float attenuation)
	Set the attenuation factor of the sound. More...

float	getPitch () const
	Get the pitch of the sound. More...

float	getVolume () const
	Get the volume of the sound. More...

Vector3f	getPosition () const
	Get the 3D position of the sound in the audio scene. More...

bool	isRelativeToListener () const
	Tell whether the sound's position is relative to the listener or is absolute. More...

float	getMinDistance () const
	Get the minimum distance of the sound. More...

float	getAttenuation () const
	Get the attenuation factor of the sound. More...

Protected Types
enum	{ NoLoop = -1 }

Protected Member Functions
virtual bool	onGetData (Chunk &data)
	Request a new chunk of audio samples from the stream source. More...

virtual void	onSeek (Time timeOffset)
	Change the current playing position in the stream source. More...

virtual Int64	onLoop ()
	Change the current playing position in the stream source to the loop offset. More...

void	initialize (unsigned int channelCount, unsigned int sampleRate)
	Define the audio stream parameters. More...

Protected Attributes
unsigned int	m_source
	OpenAL source identifier. More...

Detailed Description

Streamed music played from an audio file.

Musics are sounds that are streamed rather than completely loaded in memory.

This is especially useful for compressed musics that usually take hundreds of MB when they are uncompressed: by streaming it instead of loading it entirely, you avoid saturating the memory and have almost no loading delay. This implies that the underlying resource (file, stream or memory buffer) must remain valid for the lifetime of the sf::Music object.

Apart from that, a sf::Music has almost the same features as the sf::SoundBuffer / sf::Sound pair: you can play/pause/stop it, request its parameters (channels, sample rate), change the way it is played (pitch, volume, 3D position, ...), etc.

As a sound stream, a music is played in its own thread in order not to block the rest of the program. This means that you can leave the music alone after calling play(), it will manage itself very well.

Usage example:

// Declare a new music
sf::Music music;
// Open it from an audio file
if (!music.openFromFile("music.ogg"))
{
    // error...
}
// Change some parameters
music.setPosition(0, 1, 10); // change its 3D position
music.setPitch(2);           // increase the pitch
music.setVolume(50);         // reduce the volume
music.setLoop(true);         // make it loop
// Play it
music.play();

See also: sf::Sound, sf::SoundStream

Definition at line 48 of file Music.hpp.

Member Enumeration Documentation

◆ anonymous enum

anonymous enum

protectedinherited

Enumerator
NoLoop	"Invalid" endSeeks value, telling us to continue uninterrupted

Definition at line 183 of file SoundStream.hpp.

◆ Status

enum sf::SoundSource::Status

inherited

Enumeration of the sound source states.

Enumerator
Stopped	Sound is not playing.
Paused	Sound is paused.
Playing	Sound is playing.

Definition at line 50 of file SoundSource.hpp.

Constructor & Destructor Documentation

◆ Music()

sf::Music::Music ( )

Default constructor.

◆ ~Music()

sf::Music::~Music ( )

Destructor.

Member Function Documentation

◆ getAttenuation()

float sf::SoundSource::getAttenuation ( ) const

inherited

Get the attenuation factor of the sound.

Returns: Attenuation factor of the sound

See also: setAttenuation, getMinDistance

◆ getChannelCount()

unsigned int sf::SoundStream::getChannelCount ( ) const

inherited

Return the number of channels of the stream.

1 channel means a mono sound, 2 means stereo, etc.

Returns: Number of channels

◆ getDuration()

Time sf::Music::getDuration ( ) const

Get the total duration of the music.

Returns: Music duration

◆ getLoop()

bool sf::SoundStream::getLoop ( ) const

inherited

Tell whether or not the stream is in loop mode.

Returns: True if the stream is looping, false otherwise

See also: setLoop

◆ getLoopPoints()

TimeSpan sf::Music::getLoopPoints ( ) const

Get the positions of the of the sound's looping sequence.

Returns: Loop Time position class.

Warning: Since setLoopPoints() performs some adjustments on the provided values and rounds them to internal samples, a call to getLoopPoints() is not guaranteed to return the same times passed into a previous call to setLoopPoints(). However, it is guaranteed to return times that will map to the valid internal samples of this Music if they are later passed to setLoopPoints().

See also: setLoopPoints

◆ getMinDistance()

float sf::SoundSource::getMinDistance ( ) const

inherited

Get the minimum distance of the sound.

Returns: Minimum distance of the sound

See also: setMinDistance, getAttenuation

◆ getPitch()

float sf::SoundSource::getPitch ( ) const

inherited

Get the pitch of the sound.

Returns: Pitch of the sound

See also: setPitch

◆ getPlayingOffset()

Time sf::SoundStream::getPlayingOffset ( ) const

inherited

Get the current playing position of the stream.

Returns: Current playing position, from the beginning of the stream

See also: setPlayingOffset

◆ getPosition()

Vector3f sf::SoundSource::getPosition ( ) const

inherited

Get the 3D position of the sound in the audio scene.

Returns: Position of the sound

See also: setPosition

◆ getSampleRate()

unsigned int sf::SoundStream::getSampleRate ( ) const

inherited

Get the stream sample rate of the stream.

The sample rate is the number of audio samples played per second. The higher, the better the quality.

Returns: Sample rate, in number of samples per second

◆ getStatus()

Status sf::SoundStream::getStatus ( ) const

virtualinherited

Get the current status of the stream (stopped, paused, playing)

Returns: Current status

Reimplemented from sf::SoundSource.

◆ getVolume()

float sf::SoundSource::getVolume ( ) const

inherited

Get the volume of the sound.

Returns: Volume of the sound, in the range [0, 100]

See also: setVolume

◆ initialize()

void sf::SoundStream::initialize	(	unsigned int	channelCount,
		unsigned int	sampleRate
	)

protectedinherited

Define the audio stream parameters.

This function must be called by derived classes as soon as they know the audio settings of the stream to play. Any attempt to manipulate the stream (play(), ...) before calling this function will fail. It can be called multiple times if the settings of the audio stream change, but only when the stream is stopped.

Parameters

channelCount	Number of channels of the stream
sampleRate	Sample rate, in samples per second

◆ isRelativeToListener()

bool sf::SoundSource::isRelativeToListener ( ) const

inherited

Tell whether the sound's position is relative to the listener or is absolute.

Returns: True if the position is relative, false if it's absolute

See also: setRelativeToListener

◆ onGetData()

virtual bool sf::Music::onGetData ( Chunk & data )

protectedvirtual

Request a new chunk of audio samples from the stream source.

This function fills the chunk from the next samples to read from the audio file.

Parameters

data	Chunk of data to fill

Returns: True to continue playback, false to stop

Implements sf::SoundStream.

◆ onLoop()

virtual Int64 sf::Music::onLoop ( )

protectedvirtual

Change the current playing position in the stream source to the loop offset.

This is called by the underlying SoundStream whenever it needs us to reset the seek position for a loop. We then determine whether we are looping on a loop point or the end-of-file, perform the seek, and return the new position.

Returns: The seek position after looping (or -1 if there's no loop)

Reimplemented from sf::SoundStream.

◆ onSeek()

virtual void sf::Music::onSeek ( Time timeOffset )

protectedvirtual

Change the current playing position in the stream source.

Parameters

timeOffset New playing position, from the beginning of the music

Implements sf::SoundStream.

◆ openFromFile()

bool sf::Music::openFromFile ( const std::string & filename )

Open a music from an audio file.

This function doesn't start playing the music (call play() to do so). See the documentation of sf::InputSoundFile for the list of supported formats.

Warning: Since the music is not loaded at once but rather streamed continuously, the file must remain accessible until the sf::Music object loads a new music or is destroyed.

Parameters

filename Path of the music file to open

Returns: True if loading succeeded, false if it failed

See also: openFromMemory, openFromStream

◆ openFromMemory()

bool sf::Music::openFromMemory	(	const void *	data,
		std::size_t	sizeInBytes
	)

Open a music from an audio file in memory.

This function doesn't start playing the music (call play() to do so). See the documentation of sf::InputSoundFile for the list of supported formats.

Warning: Since the music is not loaded at once but rather streamed continuously, the data buffer must remain accessible until the sf::Music object loads a new music or is destroyed. That is, you can't deallocate the buffer right after calling this function.

Parameters

data	Pointer to the file data in memory
sizeInBytes	Size of the data to load, in bytes

Returns: True if loading succeeded, false if it failed

See also: openFromFile, openFromStream

◆ openFromStream()

bool sf::Music::openFromStream ( InputStream & stream )

Open a music from an audio file in a custom stream.

This function doesn't start playing the music (call play() to do so). See the documentation of sf::InputSoundFile for the list of supported formats.

Warning: Since the music is not loaded at once but rather streamed continuously, the stream must remain accessible until the sf::Music object loads a new music or is destroyed.

Parameters

stream Source stream to read from

Returns: True if loading succeeded, false if it failed

See also: openFromFile, openFromMemory

◆ pause()

void sf::SoundStream::pause ( )

virtualinherited

Pause the audio stream.

This function pauses the stream if it was playing, otherwise (stream already paused or stopped) it has no effect.

See also: play, stop

Implements sf::SoundSource.

◆ play()

void sf::SoundStream::play ( )

virtualinherited

Start or resume playing the audio stream.

This function starts the stream if it was stopped, resumes it if it was paused, and restarts it from the beginning if it was already playing. This function uses its own thread so that it doesn't block the rest of the program while the stream is played.

See also: pause, stop

Implements sf::SoundSource.

◆ setAttenuation()

void sf::SoundSource::setAttenuation ( float attenuation )

inherited

Set the attenuation factor of the sound.

The attenuation is a multiplicative factor which makes the sound more or less loud according to its distance from the listener. An attenuation of 0 will produce a non-attenuated sound, i.e. its volume will always be the same whether it is heard from near or from far. On the other hand, an attenuation value such as 100 will make the sound fade out very quickly as it gets further from the listener. The default value of the attenuation is 1.

Parameters

attenuation New attenuation factor of the sound

See also: getAttenuation, setMinDistance

◆ setLoop()

void sf::SoundStream::setLoop ( bool loop )

inherited

Set whether or not the stream should loop after reaching the end.

If set, the stream will restart from beginning after reaching the end and so on, until it is stopped or setLoop(false) is called. The default looping state for streams is false.

Parameters

loop	True to play in loop, false to play once

See also: getLoop

◆ setLoopPoints()

void sf::Music::setLoopPoints ( TimeSpan timePoints )

Sets the beginning and end of the sound's looping sequence using sf::Time.

Loop points allow one to specify a pair of positions such that, when the music is enabled for looping, it will seamlessly seek to the beginning whenever it encounters the end. Valid ranges for timePoints.offset and timePoints.length are [0, Dur) and (0, Dur-offset] respectively, where Dur is the value returned by getDuration(). Note that the EOF "loop point" from the end to the beginning of the stream is still honored, in case the caller seeks to a point after the end of the loop range. This function can be safely called at any point after a stream is opened, and will be applied to a playing sound without affecting the current playing offset.

Warning: Setting the loop points while the stream's status is Paused will set its status to Stopped. The playing offset will be unaffected.

Parameters

timePoints The definition of the loop. Can be any time points within the sound's length

See also: getLoopPoints

◆ setMinDistance()

void sf::SoundSource::setMinDistance ( float distance )

inherited

Set the minimum distance of the sound.

The "minimum distance" of a sound is the maximum distance at which it is heard at its maximum volume. Further than the minimum distance, it will start to fade out according to its attenuation factor. A value of 0 ("inside the head of the listener") is an invalid value and is forbidden. The default value of the minimum distance is 1.

Parameters

distance New minimum distance of the sound

See also: getMinDistance, setAttenuation

◆ setPitch()

void sf::SoundSource::setPitch ( float pitch )

inherited

Set the pitch of the sound.

The pitch represents the perceived fundamental frequency of a sound; thus you can make a sound more acute or grave by changing its pitch. A side effect of changing the pitch is to modify the playing speed of the sound as well. The default value for the pitch is 1.

Parameters

pitch New pitch to apply to the sound

See also: getPitch

◆ setPlayingOffset()

void sf::SoundStream::setPlayingOffset ( Time timeOffset )

inherited

Change the current playing position of the stream.

The playing position can be changed when the stream is either paused or playing. Changing the playing position when the stream is stopped has no effect, since playing the stream would reset its position.

Parameters

timeOffset New playing position, from the beginning of the stream

See also: getPlayingOffset

◆ setPosition() [1/2]

void sf::SoundSource::setPosition	(	float	x,
		float	y,
		float	z
	)

inherited

Set the 3D position of the sound in the audio scene.

Only sounds with one channel (mono sounds) can be spatialized. The default position of a sound is (0, 0, 0).

Parameters

x	X coordinate of the position of the sound in the scene
y	Y coordinate of the position of the sound in the scene
z	Z coordinate of the position of the sound in the scene

See also: getPosition

◆ setPosition() [2/2]

void sf::SoundSource::setPosition ( const Vector3f & position )

inherited

Set the 3D position of the sound in the audio scene.

Only sounds with one channel (mono sounds) can be spatialized. The default position of a sound is (0, 0, 0).

Parameters

position Position of the sound in the scene

See also: getPosition

◆ setRelativeToListener()

void sf::SoundSource::setRelativeToListener ( bool relative )

inherited

Make the sound's position relative to the listener or absolute.

Making a sound relative to the listener will ensure that it will always be played the same way regardless of the position of the listener. This can be useful for non-spatialized sounds, sounds that are produced by the listener, or sounds attached to it. The default value is false (position is absolute).

Parameters

relative True to set the position relative, false to set it absolute

See also: isRelativeToListener

◆ setVolume()

void sf::SoundSource::setVolume ( float volume )

inherited

Set the volume of the sound.

The volume is a value between 0 (mute) and 100 (full volume). The default value for the volume is 100.

Parameters

volume Volume of the sound

See also: getVolume

◆ stop()

void sf::SoundStream::stop ( )

virtualinherited

Stop playing the audio stream.

This function stops the stream if it was playing or paused, and does nothing if it was already stopped. It also resets the playing position (unlike pause()).

See also: play, pause

Implements sf::SoundSource.

Member Data Documentation

◆ m_source

unsigned int sf::SoundSource::m_source

protectedinherited

OpenAL source identifier.

Definition at line 309 of file SoundSource.hpp.

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

Music.hpp

Classes

Public Types

Public Member Functions

Protected Types

Protected Member Functions

Protected Attributes

Detailed Description

Member Enumeration Documentation

◆ anonymous enum

◆ Status

Constructor & Destructor Documentation

◆ Music()

◆ ~Music()

Member Function Documentation

◆ getAttenuation()

◆ getChannelCount()

◆ getDuration()

◆ getLoop()

◆ getLoopPoints()

◆ getMinDistance()

◆ getPitch()

◆ getPlayingOffset()

◆ getPosition()

◆ getSampleRate()

◆ getStatus()

◆ getVolume()

◆ initialize()

◆ isRelativeToListener()

◆ onGetData()

◆ onLoop()

◆ onSeek()

◆ openFromFile()

◆ openFromMemory()

◆ openFromStream()

◆ pause()

◆ play()

◆ setAttenuation()

◆ setLoop()

◆ setLoopPoints()

◆ setMinDistance()

◆ setPitch()

◆ setPlayingOffset()

◆ setPosition() [1/2]

◆ setPosition() [2/2]

◆ setRelativeToListener()

◆ setVolume()

◆ stop()

Member Data Documentation

◆ m_source