al

package
v0.0.0-...-2824937 Latest Latest
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This package is not in the latest version of its module.

 Go to latest Published: Nov 2, 2020 License: MIT, BSD-3-Clause Imports: 4 Imported by: 0

Documentation

Overview

Package al provides OpenAL Soft bindings for Go.

Calls are not safe for concurrent use.

More information about OpenAL Soft is available at http://www.openal.org/documentation/openal-1.1-specification.pdf.

In order to use this package on Linux desktop distros, you will need OpenAL library as an external dependency. On Ubuntu 14.04 'Trusty', you may have to install this library by running the command below. 

sudo apt-get install libopenal-dev

When compiled for Android, this package uses OpenAL Soft. Please add its license file to the open source notices of your application. OpenAL Soft's license file could be found at http://repo.or.cz/w/openal-soft.git/blob/HEAD:/COPYING.

Index

Constants

View Source 
const (
	InvalidName      = 0xA001
	InvalidEnum      = 0xA002
	InvalidValue     = 0xA003
	InvalidOperation = 0xA004
	OutOfMemory      = 0xA005
)

Error returns one of these error codes.

View Source 
const (
	InverseDistance         = 0xD001
	InverseDistanceClamped  = 0xD002
	LinearDistance          = 0xD003
	LinearDistanceClamped   = 0xD004
	ExponentDistance        = 0xD005
	ExponentDistanceClamped = 0xD006
)

Distance models.

View Source 
const (
	Initial = 0x1011
	Playing = 0x1012
	Paused  = 0x1013
	Stopped = 0x1014
)

A source could be in the state of initial, playing, paused or stopped.

View Source 
const (
	FormatMono8    = 0x1100
	FormatMono16   = 0x1101
	FormatStereo8  = 0x1102
	FormatStereo16 = 0x1103
)

Audio formats. Buffer.BufferData accepts one of these formats as the data format.

View Source 
const CapabilityDistanceModel = Capability(0x200)

CapabilityDistanceModel represents the capability of specifying a different distance model for each source.

Variables

This section is empty.

Functions

func CloseDevice 

func CloseDevice()

CloseDevice closes the device and frees related resources. Calls to CloseDevice are safe for concurrent use.

func DeleteBuffers 

func DeleteBuffers(buffer ...Buffer)

DeleteBuffers deletes the buffers.

func DeleteSources 

func DeleteSources(source ...Source)

DeleteSources deletes the sources.

func DeviceError 

func DeviceError() int32

DeviceError returns the last known error from the current device.

func Disable 

func Disable(c Capability)

Disable disables a capability.

func DistanceModel 

func DistanceModel() int32

DistanceModel returns the distance model.

func DopplerFactor 

func DopplerFactor() float32

DopplerFactor returns the doppler factor.

func DopplerVelocity 

func DopplerVelocity() float32

DopplerVelocity returns the doppler velocity.

func Enable 

func Enable(c Capability)

Enable enables a capability.

func Enabled 

func Enabled(c Capability) bool

Enabled returns true if the specified capability is enabled.

func Error 

func Error() int32

Error returns the most recently generated error.

func Extensions 

func Extensions() string

Extensions returns the enabled extensions.

func ListenerGain 

func ListenerGain() float32

ListenerGain returns the total gain applied to the final mix.

func OpenDevice 

func OpenDevice() error

OpenDevice opens the default audio device. Calls to OpenDevice are safe for concurrent use.

func PauseSources 

func PauseSources(source ...Source)

PauseSources pauses the sources.

func PlaySources 

func PlaySources(source ...Source)

PlaySources plays the sources.

func Renderer 

func Renderer() string

Renderer returns the renderer information.

func RewindSources 

func RewindSources(source ...Source)

RewindSources rewinds the sources to their beginning positions.

func SetDistanceModel 

func SetDistanceModel(v int32)

SetDistanceModel sets the distance model.

func SetDopplerFactor 

func SetDopplerFactor(v float32)

SetDopplerFactor sets the doppler factor.

func SetDopplerVelocity 

func SetDopplerVelocity(v float32)

SetDopplerVelocity sets the doppler velocity.

func SetListenerGain 

func SetListenerGain(v float32)

SetListenerGain sets the total gain that will be applied to the final mix.

func SetListenerOrientation 

func SetListenerOrientation(v Orientation)

SetListenerOrientation sets the orientation of the listener.

func SetListenerPosition 

func SetListenerPosition(v Vector)

SetListenerPosition sets the position of the listener.

func SetListenerVelocity 

func SetListenerVelocity(v Vector)

SetListenerVelocity sets the velocity of the listener.

func SetSpeedOfSound 

func SetSpeedOfSound(v float32)

SetSpeedOfSound sets the speed of sound, its unit should be meters per second (m/s).

func SpeedOfSound 

func SpeedOfSound() float32

SpeedOfSound is the speed of sound in meters per second (m/s).

func StopSources 

func StopSources(source ...Source)

StopSources stops the sources.

func Vendor 

func Vendor() string

Vendor returns the vendor.

func Version 

func Version() string

Version returns the version string.

Types

type Buffer 

type Buffer uint32

A buffer represents a chunk of PCM audio data that could be buffered to an audio source. A single buffer could be shared between multiple sources.

func GenBuffers 

func GenBuffers(n int) []Buffer

GenBuffers generates n new buffers. The generated buffers should be deleted once they are no longer in use.

func (Buffer) Bits 

func (b Buffer) Bits() int32

Bits return the number of bits used to represent a sample.

func (Buffer) BufferData 

func (b Buffer) BufferData(format uint32, data []byte, freq int32)

BufferData buffers PCM data to the current buffer.

func (Buffer) Channels 

func (b Buffer) Channels() int32

Channels return the number of the audio channels.

func (Buffer) Frequency 

func (b Buffer) Frequency() int32

Frequency returns the frequency of the buffer data in Hertz (Hz).

func (Buffer) Size 

func (b Buffer) Size() int32

Size returns the size of the data.

func (Buffer) Valid 

func (b Buffer) Valid() bool

Valid returns true if the buffer exists and is valid.

type Capability 

type Capability int32

Capability represents OpenAL extension capabilities.

type Orientation 

type Orientation struct {
	// Forward vector is the direction that the object is looking at.
	Forward Vector
	// Up vector represents the rotation of the object.
	Up Vector
}

Orientation represents the angular position of an object in a right-handed Cartesian coordinate system. A cross product between the forward and up vector returns a vector that points to the right.

func ListenerOrientation 

func ListenerOrientation() Orientation

ListenerOrientation returns the orientation of the listener.

type Source 

type Source uint32

Source represents an individual sound source in 3D-space. They take PCM data, apply modifications and then submit them to be mixed according to their spatial location.

func GenSources 

func GenSources(n int) []Source

GenSources generates n new sources. These sources should be deleted once they are not in use.

func (Source) BuffersProcessed 

func (s Source) BuffersProcessed() int32

BuffersProcessed returns the number of the processed buffers.

func (Source) BuffersQueued 

func (s Source) BuffersQueued() int32

BuffersQueued returns the number of the queued buffers.

func (Source) Gain 

func (s Source) Gain() float32

Gain returns the source gain.

func (Source) MaxGain 

func (s Source) MaxGain() float32

MaxGain returns the source's maximum gain setting.

func (Source) MinGain 

func (s Source) MinGain() float32

MinGain returns the source's minimum gain setting.

func (Source) OffsetByte 

func (s Source) OffsetByte() int32

OffsetByte returns the byte offset of the current playback position.

func (Source) OffsetSample 

func (s Source) OffsetSample() int32

OffsetSample returns the sample offset of the current playback position.

func (Source) OffsetSeconds 

func (s Source) OffsetSeconds() int32

OffsetSeconds returns the current playback position of the source in seconds.

func (Source) Orientation 

func (s Source) Orientation() Orientation

Orientation returns the orientation of the source.

func (Source) Position 

func (s Source) Position() Vector

Position returns the position of the source.

func (Source) QueueBuffers 

func (s Source) QueueBuffers(buffer ...Buffer)

QueueBuffers adds the buffers to the buffer queue.

func (Source) SetGain 

func (s Source) SetGain(v float32)

SetGain sets the source gain.

func (Source) SetMaxGain 

func (s Source) SetMaxGain(v float32)

SetMaxGain sets the source's maximum gain setting.

func (Source) SetMinGain 

func (s Source) SetMinGain(v float32)

SetMinGain sets the source's minimum gain setting.

func (Source) SetOrientation 

func (s Source) SetOrientation(o Orientation)

SetOrientation sets the orientation of the source.

func (Source) SetPosition 

func (s Source) SetPosition(v Vector)

SetPosition sets the position of the source.

func (Source) SetVelocity 

func (s Source) SetVelocity(v Vector)

SetVelocity sets the source's velocity.

func (Source) State 

func (s Source) State() int32

State returns the playing state of the source.

func (Source) UnqueueBuffers 

func (s Source) UnqueueBuffers(buffer ...Buffer)

UnqueueBuffers removes the specified buffers from the buffer queue.

func (Source) Velocity 

func (s Source) Velocity() Vector

Velocity returns the source's velocity.

type Vector 

type Vector [3]float32

Vector represents an vector in a Cartesian coordinate system.

func ListenerPosition 

func ListenerPosition() Vector

ListenerPosition returns the position of the listener.

func ListenerVelocity 

func ListenerVelocity() Vector

ListenerVelocity returns the velocity of the listener.

Source Files

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