AudioServer

Inherits: Object

Server interface for low-level audio access.

Description

AudioServer is a low-level server interface for audio access. It is in charge of creating sample data (playable audio) as well as its playback via a voice interface.

Tutorials

• Audio buses

• Audio Device Changer Demo

• Audio Mic Record Demo

• Audio Spectrum Demo

Properties

int	bus_count	1
String	input_device	"Default"
String	output_device	"Default"
float	playback_speed_scale	1.0

Methods

void	add_bus ( int at_position=-1 )
void	add_bus_effect ( int bus_idx, AudioEffect effect, int at_position=-1 )
AudioBusLayout	generate_bus_layout ( ) const
int	get_bus_channels ( int bus_idx ) const
AudioEffect	get_bus_effect ( int bus_idx, int effect_idx )
int	get_bus_effect_count ( int bus_idx )
AudioEffectInstance	get_bus_effect_instance ( int bus_idx, int effect_idx, int channel=0 )
int	get_bus_index ( StringName bus_name ) const
String	get_bus_name ( int bus_idx ) const
float	get_bus_peak_volume_left_db ( int bus_idx, int channel ) const
float	get_bus_peak_volume_right_db ( int bus_idx, int channel ) const
StringName	get_bus_send ( int bus_idx ) const
float	get_bus_volume_db ( int bus_idx ) const
PackedStringArray	get_input_device_list ( )
float	get_mix_rate ( ) const
PackedStringArray	get_output_device_list ( )
float	get_output_latency ( ) const
SpeakerMode	get_speaker_mode ( ) const
float	get_time_since_last_mix ( ) const
float	get_time_to_next_mix ( ) const
bool	is_bus_bypassing_effects ( int bus_idx ) const
bool	is_bus_effect_enabled ( int bus_idx, int effect_idx ) const
bool	is_bus_mute ( int bus_idx ) const
bool	is_bus_solo ( int bus_idx ) const
void	lock ( )
void	move_bus ( int index, int to_index )
void	remove_bus ( int index )
void	remove_bus_effect ( int bus_idx, int effect_idx )
void	set_bus_bypass_effects ( int bus_idx, bool enable )
void	set_bus_effect_enabled ( int bus_idx, int effect_idx, bool enabled )
void	set_bus_layout ( AudioBusLayout bus_layout )
void	set_bus_mute ( int bus_idx, bool enable )
void	set_bus_name ( int bus_idx, String name )
void	set_bus_send ( int bus_idx, StringName send )
void	set_bus_solo ( int bus_idx, bool enable )
void	set_bus_volume_db ( int bus_idx, float volume_db )
void	set_enable_tagging_used_audio_streams ( bool enable )
void	swap_bus_effects ( int bus_idx, int effect_idx, int by_effect_idx )
void	unlock ( )

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Signals

bus_layout_changed ( )

Emitted when the AudioBusLayout changes.

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Enumerations

enum SpeakerMode:

SpeakerMode SPEAKER_MODE_STEREO = 0

Two or fewer speakers were detected.

SpeakerMode SPEAKER_SURROUND_31 = 1

A 3.1 channel surround setup was detected.

SpeakerMode SPEAKER_SURROUND_51 = 2

A 5.1 channel surround setup was detected.

SpeakerMode SPEAKER_SURROUND_71 = 3

A 7.1 channel surround setup was detected.

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Property Descriptions

int bus_count = 1

• void set_bus_count ( int value )

• int get_bus_count ( )

Number of available audio buses.

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String input_device = "Default"

• void set_input_device ( String value )

• String get_input_device ( )

Name of the current device for audio input (see get_input_device_list). On systems with multiple audio inputs (such as analog, USB and HDMI audio), this can be used to select the audio input device. The value "Default" will record audio on the system-wide default audio input. If an invalid device name is set, the value will be reverted back to "Default".

Note: ProjectSettings.audio/driver/enable_input must be true for audio input to work. See also that setting's description for caveats related to permissions and operating system privacy settings.

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String output_device = "Default"

• void set_output_device ( String value )

• String get_output_device ( )

Name of the current device for audio output (see get_output_device_list). On systems with multiple audio outputs (such as analog, USB and HDMI audio), this can be used to select the audio output device. The value "Default" will play audio on the system-wide default audio output. If an invalid device name is set, the value will be reverted back to "Default".

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float playback_speed_scale = 1.0

• void set_playback_speed_scale ( float value )

• float get_playback_speed_scale ( )

Scales the rate at which audio is played (i.e. setting it to 0.5 will make the audio be played at half its speed).

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Method Descriptions

void add_bus ( int at_position=-1 )

Adds a bus at at_position.

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void add_bus_effect ( int bus_idx, AudioEffect effect, int at_position=-1 )

Adds an AudioEffect effect to the bus bus_idx at at_position.

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AudioBusLayout generate_bus_layout ( ) const

Generates an AudioBusLayout using the available buses and effects.

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int get_bus_channels ( int bus_idx ) const

Returns the number of channels of the bus at index bus_idx.

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AudioEffect get_bus_effect ( int bus_idx, int effect_idx )

Returns the AudioEffect at position effect_idx in bus bus_idx.

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int get_bus_effect_count ( int bus_idx )

Returns the number of effects on the bus at bus_idx.

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AudioEffectInstance get_bus_effect_instance ( int bus_idx, int effect_idx, int channel=0 )

Returns the AudioEffectInstance assigned to the given bus and effect indices (and optionally channel).

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int get_bus_index ( StringName bus_name ) const

Returns the index of the bus with the name bus_name. Returns -1 if no bus with the specified name exist.

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String get_bus_name ( int bus_idx ) const

Returns the name of the bus with the index bus_idx.

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float get_bus_peak_volume_left_db ( int bus_idx, int channel ) const

Returns the peak volume of the left speaker at bus index bus_idx and channel index channel.

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float get_bus_peak_volume_right_db ( int bus_idx, int channel ) const

Returns the peak volume of the right speaker at bus index bus_idx and channel index channel.

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StringName get_bus_send ( int bus_idx ) const

Returns the name of the bus that the bus at index bus_idx sends to.

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float get_bus_volume_db ( int bus_idx ) const

Returns the volume of the bus at index bus_idx in dB.

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PackedStringArray get_input_device_list ( )

Returns the names of all audio input devices detected on the system.

Note: ProjectSettings.audio/driver/enable_input must be true for audio input to work. See also that setting's description for caveats related to permissions and operating system privacy settings.

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float get_mix_rate ( ) const

Returns the sample rate at the output of the AudioServer.

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PackedStringArray get_output_device_list ( )

Returns the names of all audio output devices detected on the system.

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float get_output_latency ( ) const

Returns the audio driver's effective output latency. This is based on ProjectSettings.audio/driver/output_latency, but the exact returned value will differ depending on the operating system and audio driver.

Note: This can be expensive; it is not recommended to call get_output_latency every frame.

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SpeakerMode get_speaker_mode ( ) const

Returns the speaker configuration.

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float get_time_since_last_mix ( ) const

Returns the relative time since the last mix occurred.

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float get_time_to_next_mix ( ) const

Returns the relative time until the next mix occurs.

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bool is_bus_bypassing_effects ( int bus_idx ) const

If true, the bus at index bus_idx is bypassing effects.

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bool is_bus_effect_enabled ( int bus_idx, int effect_idx ) const

If true, the effect at index effect_idx on the bus at index bus_idx is enabled.

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bool is_bus_mute ( int bus_idx ) const

If true, the bus at index bus_idx is muted.

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bool is_bus_solo ( int bus_idx ) const

If true, the bus at index bus_idx is in solo mode.

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void lock ( )

Locks the audio driver's main loop.

Note: Remember to unlock it afterwards.

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void move_bus ( int index, int to_index )

Moves the bus from index index to index to_index.

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void remove_bus ( int index )

Removes the bus at index index.

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void remove_bus_effect ( int bus_idx, int effect_idx )

Removes the effect at index effect_idx from the bus at index bus_idx.

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void set_bus_bypass_effects ( int bus_idx, bool enable )

If true, the bus at index bus_idx is bypassing effects.

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void set_bus_effect_enabled ( int bus_idx, int effect_idx, bool enabled )

If true, the effect at index effect_idx on the bus at index bus_idx is enabled.

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void set_bus_layout ( AudioBusLayout bus_layout )

Overwrites the currently used AudioBusLayout.

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void set_bus_mute ( int bus_idx, bool enable )

If true, the bus at index bus_idx is muted.

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void set_bus_name ( int bus_idx, String name )

Sets the name of the bus at index bus_idx to name.

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void set_bus_send ( int bus_idx, StringName send )

Connects the output of the bus at bus_idx to the bus named send.

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void set_bus_solo ( int bus_idx, bool enable )

If true, the bus at index bus_idx is in solo mode.

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void set_bus_volume_db ( int bus_idx, float volume_db )

Sets the volume of the bus at index bus_idx to volume_db.

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void set_enable_tagging_used_audio_streams ( bool enable )

There is currently no description for this method. Please help us by contributing one!

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void swap_bus_effects ( int bus_idx, int effect_idx, int by_effect_idx )

Swaps the position of two effects in bus bus_idx.

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void unlock ( )

Unlocks the audio driver's main loop. (After locking it, you should always unlock it.)