# AL10 (LWJGL API)
Date: 2015-07-28

## org.lwjgl.openal
Class AL10

    java.lang.Object
      org.lwjgl.openal.AL10

    public final class AL10

extends java.lang.Object

This is the core OpenAL class. This class implements AL.h version 1.0

Version:
  $Revision$ $Id$
Author:
  Brian Matzon <brian@matzon.dk>

Field Summary
`static int` `AL_BITS` Sound buffers: The number of bits per sample for the data contained in the buffer.
`static int` `AL_BUFFER` Indicate the buffer to provide sound samples.
`static int` `AL_BUFFERS_PROCESSED` Buffer Queue params
`static int` `AL_BUFFERS_QUEUED` Buffer Queue params
`static int` `AL_CHANNEL_MASK` Specify the channel mask.
`static int` `AL_CHANNELS` Sound buffers: The number of channels for the data contained in the buffer.
`static int` `AL_CONE_INNER_ANGLE` Directional source, inner cone angle, in degrees Range: [0-360] Default: 360
`static int` `AL_CONE_OUTER_ANGLE` Directional source, outer cone angle, in degrees.
`static int` `AL_CONE_OUTER_GAIN` Indicate the gain (volume amplification) applied.
`static int` `AL_DATA` Deprecated. This token is a relict of the early OpenAL days and is no longer supported. Neither the OpenAL spec nor OpenAL Soft define it.
`static int` `AL_DIRECTION` Specify the current direction as forward vector.
`static int` `AL_DISTANCE_MODEL` Distance model.
`static int` `AL_DOPPLER_FACTOR` Doppler scale.
`static int` `AL_DOPPLER_VELOCITY` Doppler velocity.
`static int` `AL_EXTENSIONS` Context strings: Extensions
`static int` `AL_FALSE` Boolean False
`static int` `AL_FORMAT_MONO16` Sound buffers: format specifier.
`static int` `AL_FORMAT_MONO8` Sound buffers: format specifier.
`static int` `AL_FORMAT_STEREO16` Sound buffers: format specifier.
`static int` `AL_FORMAT_STEREO8` Sound buffers: format specifier.
`static int` `AL_FORMAT_VORBIS_EXT` Ogg Vorbis format specifier.
`static int` `AL_FREQUENCY` Sound buffers: frequency, in units of Hertz [Hz].
`static int` `AL_GAIN` Indicate the gain (volume amplification) applied.
`static int` `AL_INITIAL` Source state information
`static int` `AL_INVALID` Bad value
`static int` `AL_INVALID_ENUM` Illegal enum passed as an argument to an AL call.
`static int` `AL_INVALID_NAME` Illegal name passed as an argument to an AL call.
`static int` `AL_INVALID_OPERATION` A function was called at inappropriate time, or in an inappropriate way, causing an illegal state.
`static int` `AL_INVALID_VALUE` Illegal value passed as an argument to an AL call.
`static int` `AL_INVERSE_DISTANCE` Distance model
`static int` `AL_INVERSE_DISTANCE_CLAMPED` Distance model
`static int` `AL_LOOPING` Indicate whether source has to loop infinite.
`static int` `AL_MAX_DISTANCE` Specify the maximum distance.
`static int` `AL_MAX_GAIN` Indicate maximum source attenuation.
`static int` `AL_MIN_GAIN` Indicate minimum source attenuation.
`static int` `AL_NO_ERROR` Errors: No Error.
`static int` `AL_NONE` Disable value
`static int` `AL_ORIENTATION` Specify the current orientation.
`static int` `AL_OUT_OF_MEMORY` A function could not be completed, because there is not enough memory available.
`static int` `AL_PAUSED` Source state information
`static int` `AL_PENDING` Buffer state.
`static int` `AL_PITCH` Specify the pitch to be applied, either at source, or on mixer results, at listener.
`static int` `AL_PLAYING` Source state information
`static int` `AL_POSITION` Specify the current location in three dimensional space.
`static int` `AL_PROCESSED` Buffer state.
`static int` `AL_REFERENCE_DISTANCE` Specify the current orientation.
`static int` `AL_RENDERER` Context strings: Renderer
`static int` `AL_ROLLOFF_FACTOR` Indicate the rolloff factor for the source.
`static int` `AL_SIZE` Sound buffers: Size in bytes of the buffer data.
`static int` `AL_SOURCE_ABSOLUTE` Indicate source has absolute coordinates
`static int` `AL_SOURCE_RELATIVE` Indicate Source has listener relative coordinates
`static int` `AL_SOURCE_STATE` Source state information
`static int` `AL_SOURCE_TYPE` Indicate the type of SOURCE.
`static int` `AL_STOPPED` Source state information
`static int` `AL_TRUE` Boolean True
`static int` `AL_UNUSED` Buffer state.
`static int` `AL_VELOCITY` Specify the current velocity in three dimensional space.
`static int` `AL_VENDOR` Context strings: Vendor
`static int` `AL_VERSION` Context strings: Version

Method Summary
`static void` `alBufferData(int buffer, int format, java.nio.ByteBuffer data, int freq)` A special case of Buffer state is the actual sound sample data stored in asociation with the Buffer.
`static void` `alBufferData(int buffer, int format, java.nio.IntBuffer data, int freq)` A special case of Buffer state is the actual sound sample data stored in asociation with the Buffer.
`static void` `alBufferData(int buffer, int format, java.nio.ShortBuffer data, int freq)` A special case of Buffer state is the actual sound sample data stored in asociation with the Buffer.
`static void` `alDeleteBuffers(int buffer)` Overloads alDeleteBuffers.
`static void` `alDeleteBuffers(java.nio.IntBuffer buffers)` The application requests deletion of a number of Buffers by calling DeleteBuffers.
`static void` `alDeleteSources(int source)` Overloads alDeleteSources.
`static void` `alDeleteSources(java.nio.IntBuffer sources)` The application requests deletion of a number of Sources by DeleteSources.
`static void` `alDisable(int capability)` The application can temporarily disable certain AL capabilities on a per Context basis.
`static void` `alDistanceModel(int value)` Samples usually use the entire dynamic range of the chosen format/encoding, independent of their real world intensity.
`static void` `alDopplerFactor(float value)` The Doppler Effect depends on the velocities of Source and Listener relative to the medium, and the propagation speed of sound in that medium.
`static void` `alDopplerVelocity(float value)` The Doppler Effect depends on the velocities of Source and Listener relative to the medium, and the propagation speed of sound in that medium.
`static void` `alEnable(int capability)` The application can temporarily disable certain AL capabilities on a per Context basis.
`static int` `alGenBuffers()` Overloads alGenBuffers.
`static void` `alGenBuffers(java.nio.IntBuffer buffers)` The application requests a number of Buffers using GenBuffers.
`static int` `alGenSources()` Overloads alGenSources.
`static void` `alGenSources(java.nio.IntBuffer sources)` The application requests a number of Sources using GenSources.
`static boolean` `alGetBoolean(int pname)` Like OpenGL, AL uses a simplified interface for querying global state.
`static float` `alGetBufferf(int buffer, int pname)` Buffer state is maintained inside the AL implementation and can be queried in full. ALC_FREQUENCY - specified in samples per second, i.e.
`static int` `alGetBufferi(int buffer, int pname)` Buffer state is maintained inside the AL implementation and can be queried in full. ALC_FREQUENCY - specified in samples per second, i.e.
`static double` `alGetDouble(int pname)` Like OpenGL, AL uses a simplified interface for querying global state.
`static void` `alGetDouble(int pname, java.nio.DoubleBuffer data)` Like OpenGL, AL uses a simplified interface for querying global state.
`static int` `alGetEnumValue(java.lang.String ename)` To obtain enumeration values for extensions, the application has to use GetEnumValue of an extension token.
`static int` `alGetError()` The AL detects only a subset of those conditions that could be considered errors.
`static float` `alGetFloat(int pname)` Like OpenGL, AL uses a simplified interface for querying global state.
`static void` `alGetFloat(int pname, java.nio.FloatBuffer data)` Like OpenGL, AL uses a simplified interface for querying global state.
`static int` `alGetInteger(int pname)` Like OpenGL, AL uses a simplified interface for querying global state.
`static void` `alGetInteger(int pname, java.nio.IntBuffer data)` Like OpenGL, AL uses a simplified interface for querying global state.
`static void` `alGetListener(int pname, java.nio.FloatBuffer floatdata)` Listener state is maintained inside the AL implementation and can be queried in full.
`static float` `alGetListenerf(int pname)` Listener state is maintained inside the AL implementation and can be queried in full.
`static int` `alGetListeneri(int pname)` Listener state is maintained inside the AL implementation and can be queried in full.
`static void` `alGetSource(int source, int pname, java.nio.FloatBuffer floatdata)` Source state is maintained inside the AL implementation, and the current attributes can be queried.
`static float` `alGetSourcef(int source, int pname)` Source state is maintained inside the AL implementation, and the current attributes can be queried.
`static int` `alGetSourcei(int source, int pname)` Source state is maintained inside the AL implementation, and the current attributes can be queried.
`static java.lang.String` `alGetString(int pname)` The application can retrieve state information global to the current AL Context.
`static boolean` `alIsBuffer(int buffer)` The application can verify whether a buffer Name is valid using the IsBuffer query.
`static boolean` `alIsEnabled(int capability)` The application can also query whether a given capability is currently enabled or not.
`static boolean` `alIsExtensionPresent(java.lang.String fname)` To verify that a given extension is available for the current context and the device it is associated with, use this method.
`static boolean` `alIsSource(int id)` The application can verify whether a source name is valid using the IsSource query.
`static void` `alListener(int pname, java.nio.FloatBuffer value)` Listener attributes are changed using the Listener group of commands.
`static void` `alListener3f(int pname, float v1, float v2, float v3)` Listener attributes are changed using the Listener group of commands.
`static void` `alListenerf(int pname, float value)` Listener attributes are changed using the Listener group of commands.
`static void` `alListeneri(int pname, int value)` Listener attributes are changed using the Listener group of commands.
`static void` `alSource(int source, int pname, java.nio.FloatBuffer value)` Specifies the position and other properties as taken into account during sound processing.
`static void` `alSource3f(int source, int pname, float v1, float v2, float v3)` Specifies the position and other properties as taken into account during sound processing.
`static void` `alSourcef(int source, int pname, float value)` Specifies the position and other properties as taken into account during sound processing.
`static void` `alSourcei(int source, int pname, int value)` Specifies the position and other properties as taken into account during sound processing.
`static void` `alSourcePause(int source)` Pause() applied to an AL_INITIAL Source is a legal NOP.
`static void` `alSourcePause(java.nio.IntBuffer sources)` Pause() applied to an AL_INITIAL Source is a legal NOP.
`static void` `alSourcePlay(int source)` Play() applied to an AL_INITIAL Source will promote the Source to AL_PLAYING, thus the data found in the Buffer will be fed into the processing, starting at the beginning.
`static void` `alSourcePlay(java.nio.IntBuffer sources)` Play() applied to an AL_INITIAL Source will promote the Source to AL_PLAYING, thus the data found in the Buffer will be fed into the processing, starting at the beginning.
`static void` `alSourceQueueBuffers(int source, int buffer)` Overloads alSourceQueueBuffers.
`static void` `alSourceQueueBuffers(int source, java.nio.IntBuffer buffers)` The application can queue up one or multiple buffer names using SourceQueueBuffers.
`static void` `alSourceRewind(int source)` Rewind() applied to an AL_INITIAL Source is a legal NOP.
`static void` `alSourceRewind(java.nio.IntBuffer sources)` Rewind() applied to an AL_INITIAL Source is a legal NOP.
`static void` `alSourceStop(int source)` Stop() applied to an AL_INITIAL Source is a legal NOP.
`static void` `alSourceStop(java.nio.IntBuffer sources)` Stop() applied to an AL_INITIAL Source is a legal NOP.
`static int` `alSourceUnqueueBuffers(int source)` Overloads alSourceUnqueueBuffers.
`static void` `alSourceUnqueueBuffers(int source, java.nio.IntBuffer buffers)` Once a queue entry for a buffer has been appended to a queue and is pending processing, it should not be changed.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### AL_INVALID

    public static final int AL_INVALID

  Bad value

  See Also:
    Constant Field Values

### AL_NONE

    public static final int AL_NONE

  Disable value

  See Also:
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### AL_FALSE

    public static final int AL_FALSE

  Boolean False

  See Also:
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### AL_TRUE

    public static final int AL_TRUE

  Boolean True

  See Also:
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### AL_SOURCE_TYPE

    public static final int AL_SOURCE_TYPE

  Indicate the type of SOURCE. Sources can be spatialized

  See Also:
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### AL_SOURCE_ABSOLUTE

    public static final int AL_SOURCE_ABSOLUTE

  Indicate source has absolute coordinates

  See Also:
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### AL_SOURCE_RELATIVE

    public static final int AL_SOURCE_RELATIVE

  Indicate Source has listener relative coordinates

  See Also:
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### AL_CONE_INNER_ANGLE

    public static final int AL_CONE_INNER_ANGLE

  Directional source, inner cone angle, in degrees Range: [0-360] Default: 360

  See Also:
    Constant Field Values

### AL_CONE_OUTER_ANGLE

    public static final int AL_CONE_OUTER_ANGLE

  Directional source, outer cone angle, in degrees. Range: [0-360] Default: 360

  See Also:
    Constant Field Values

### AL_PITCH

    public static final int AL_PITCH

  Specify the pitch to be applied, either at source, or on mixer results, at listener. Range: [0.5-2.0] Default: 1.0

  See Also:
    Constant Field Values

### AL_POSITION

    public static final int AL_POSITION

  Specify the current location in three dimensional space. OpenAL, like OpenGL, uses a right handed coordinate system, where in a frontal default view X (thumb) points right, Y points up (index finger), and Z points towards the viewer/camera (middle finger). To switch from a left handed coordinate system, flip the sign on the Z coordinate. Listener position is always in the world coordinate system.

  See Also:
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### AL_DIRECTION

    public static final int AL_DIRECTION

  Specify the current direction as forward vector.

  See Also:
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### AL_VELOCITY

    public static final int AL_VELOCITY

  Specify the current velocity in three dimensional space.

  See Also:
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### AL_LOOPING

    public static final int AL_LOOPING

  Indicate whether source has to loop infinite. Type: ALboolean Range: [TRUE, FALSE] Default: FALSE

  See Also:
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### AL_BUFFER

    public static final int AL_BUFFER

  Indicate the buffer to provide sound samples. Type: ALuint. Range: any valid Buffer id.

  See Also:
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### AL_GAIN

    public static final int AL_GAIN

  Indicate the gain (volume amplification) applied. Type: ALfloat. Range: ]0.0- ] A value of 1.0 means un-attenuated/unchanged. Each division by 2 equals an attenuation of -6dB. Each multiplicaton with 2 equals an amplification of +6dB. A value of 0.0 is meaningless with respect to a logarithmic scale; it is interpreted as zero volume - the channel is effectively disabled.

  See Also:
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### AL_MIN_GAIN

    public static final int AL_MIN_GAIN

  Indicate minimum source attenuation. Type: ALfloat Range: [0.0 - 1.0]

  See Also:
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### AL_MAX_GAIN

    public static final int AL_MAX_GAIN

  Indicate maximum source attenuation. Type: ALfloat Range: [0.0 - 1.0]

  See Also:
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### AL_ORIENTATION

    public static final int AL_ORIENTATION

  Specify the current orientation. Type: ALfv6 (at/up) Range: N/A

  See Also:
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### AL_REFERENCE_DISTANCE

    public static final int AL_REFERENCE_DISTANCE

  Specify the current orientation. Type: ALfv6 (at/up) Range: N/A

  See Also:
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### AL_ROLLOFF_FACTOR

    public static final int AL_ROLLOFF_FACTOR

  Indicate the rolloff factor for the source. Type: ALfloat Range: [0.0 - ] Default: 1.0

  See Also:
    Constant Field Values

### AL_CONE_OUTER_GAIN

    public static final int AL_CONE_OUTER_GAIN

  Indicate the gain (volume amplification) applied. Type: ALfloat. Range: ]0.0- ] A value of 1.0 means un-attenuated/unchanged. Each division by 2 equals an attenuation of -6dB. Each multiplicaton with 2 equals an amplification of +6dB. A value of 0.0 is meaningless with respect to a logarithmic scale; it is interpreted as zero volume - the channel is effectively disabled.

  See Also:
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### AL_MAX_DISTANCE

    public static final int AL_MAX_DISTANCE

  Specify the maximum distance. Type: ALfloat Range: [0.0 - ]

  See Also:
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### AL_CHANNEL_MASK

    public static final int AL_CHANNEL_MASK

  Specify the channel mask. (Creative) Type: ALuint Range: [0 - 255]

  See Also:
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### AL_SOURCE_STATE

    public static final int AL_SOURCE_STATE

  Source state information

  See Also:
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### AL_INITIAL

    public static final int AL_INITIAL

  Source state information

  See Also:
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### AL_PLAYING

    public static final int AL_PLAYING

  Source state information

  See Also:
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### AL_PAUSED

    public static final int AL_PAUSED

  Source state information

  See Also:
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### AL_STOPPED

    public static final int AL_STOPPED

  Source state information

  See Also:
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### AL_BUFFERS_QUEUED

    public static final int AL_BUFFERS_QUEUED

  Buffer Queue params

  See Also:
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### AL_BUFFERS_PROCESSED

    public static final int AL_BUFFERS_PROCESSED

  Buffer Queue params

  See Also:
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### AL_FORMAT_MONO8

    public static final int AL_FORMAT_MONO8

  Sound buffers: format specifier.

  See Also:
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### AL_FORMAT_MONO16

    public static final int AL_FORMAT_MONO16

  Sound buffers: format specifier.

  See Also:
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### AL_FORMAT_STEREO8

    public static final int AL_FORMAT_STEREO8

  Sound buffers: format specifier.

  See Also:
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### AL_FORMAT_STEREO16

    public static final int AL_FORMAT_STEREO16

  Sound buffers: format specifier.

  See Also:
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### AL_FORMAT_VORBIS_EXT

    public static final int AL_FORMAT_VORBIS_EXT

  Ogg Vorbis format specifier.

  See Also:
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### AL_FREQUENCY

    public static final int AL_FREQUENCY

  Sound buffers: frequency, in units of Hertz [Hz]. This is the number of samples per second. Half of the sample frequency marks the maximum significant frequency component.

  See Also:
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### AL_BITS

    public static final int AL_BITS

  Sound buffers: The number of bits per sample for the data contained in the buffer.

  See Also:
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### AL_CHANNELS

    public static final int AL_CHANNELS

  Sound buffers: The number of channels for the data contained in the buffer.

  See Also:
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### AL_SIZE

    public static final int AL_SIZE

  Sound buffers: Size in bytes of the buffer data.

  See Also:
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### AL_DATA

    public static final int AL_DATA

  Deprecated. This token is a relict of the early OpenAL days and is no longer supported. Neither the OpenAL spec nor OpenAL Soft define it.
  See Also:
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### AL_UNUSED

    public static final int AL_UNUSED

  Buffer state.

  Not supported for public use (yet).

  See Also:
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### AL_PENDING

    public static final int AL_PENDING

  Buffer state.

  Not supported for public use (yet).

  See Also:
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### AL_PROCESSED

    public static final int AL_PROCESSED

  Buffer state.

  Not supported for public use (yet).

  See Also:
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### AL_NO_ERROR

    public static final int AL_NO_ERROR

  Errors: No Error.

  See Also:
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### AL_INVALID_NAME

    public static final int AL_INVALID_NAME

  Illegal name passed as an argument to an AL call.

  See Also:
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### AL_INVALID_ENUM

    public static final int AL_INVALID_ENUM

  Illegal enum passed as an argument to an AL call.

  See Also:
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### AL_INVALID_VALUE

    public static final int AL_INVALID_VALUE

  Illegal value passed as an argument to an AL call. Applies to parameter values, but not to enumerations.

  See Also:
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### AL_INVALID_OPERATION

    public static final int AL_INVALID_OPERATION

  A function was called at inappropriate time, or in an inappropriate way, causing an illegal state. This can be an incompatible ALenum, object ID, and/or function.

  See Also:
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### AL_OUT_OF_MEMORY

    public static final int AL_OUT_OF_MEMORY

  A function could not be completed, because there is not enough memory available.

  See Also:
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### AL_VENDOR

    public static final int AL_VENDOR

  Context strings: Vendor

  See Also:
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### AL_VERSION

    public static final int AL_VERSION

  Context strings: Version

  See Also:
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### AL_RENDERER

    public static final int AL_RENDERER

  Context strings: Renderer

  See Also:
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### AL_EXTENSIONS

    public static final int AL_EXTENSIONS

  Context strings: Extensions

  See Also:
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### AL_DOPPLER_FACTOR

    public static final int AL_DOPPLER_FACTOR

  Doppler scale. Default 1.0

  See Also:
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### AL_DOPPLER_VELOCITY

    public static final int AL_DOPPLER_VELOCITY

  Doppler velocity. Default 1.0

  See Also:
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### AL_DISTANCE_MODEL

    public static final int AL_DISTANCE_MODEL

  Distance model. Default INVERSE_DISTANCE_CLAMPED

  See Also:
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### AL_INVERSE_DISTANCE

    public static final int AL_INVERSE_DISTANCE

  Distance model

  See Also:
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### AL_INVERSE_DISTANCE_CLAMPED

    public static final int AL_INVERSE_DISTANCE_CLAMPED

  Distance model

  See Also:
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Method Detail

### alEnable

    public static void alEnable(int capability)

  The application can temporarily disable certain AL capabilities on a per Context basis. This allows the driver implementation to optimize for certain subsets of operations. Enabling and disabling capabilities is handled using a function pair.

  Parameters:
    `capability` - name of a capability to enable

### alDisable

    public static void alDisable(int capability)

  The application can temporarily disable certain AL capabilities on a per Context basis. This allows the driver implementation to optimize for certain subsets of operations. Enabling and disabling capabilities is handled using a function pair.

  Parameters:
    `capability` - name of a capability to disable

### alIsEnabled

    public static boolean alIsEnabled(int capability)

  The application can also query whether a given capability is currently enabled or not.

  If the token used to specify target is not legal, an AL_INVALID_ENUM error will be generated.

  At this time, this mechanism is not used. There are no valid targets.

  Parameters:
    `capability` - name of a capability to check
  Returns:
    true if named feature is enabled

### alGetBoolean

    public static boolean alGetBoolean(int pname)

  Like OpenGL, AL uses a simplified interface for querying global state.

  Legal values are e.g. AL_DOPPLER_FACTOR, AL_DOPPLER_VELOCITY, AL_DISTANCE_MODEL.

  `null` destinations are quietly ignored. AL_INVALID_ENUM is the response to errors in specifying pName. The amount of memory required in the destination depends on the actual state requested.

  Returns:
    boolean state described by pname will be returned.

### alGetInteger

    public static int alGetInteger(int pname)

  Like OpenGL, AL uses a simplified interface for querying global state.

  Legal values are e.g. AL_DOPPLER_FACTOR, AL_DOPPLER_VELOCITY, AL_DISTANCE_MODEL.

  `null` destinations are quietly ignored. AL_INVALID_ENUM is the response to errors in specifying pName. The amount of memory required in the destination depends on the actual state requested.

  Returns:
    int state described by pname will be returned.

### alGetFloat

    public static float alGetFloat(int pname)

  Like OpenGL, AL uses a simplified interface for querying global state.

  Legal values are e.g. AL_DOPPLER_FACTOR, AL_DOPPLER_VELOCITY, AL_DISTANCE_MODEL.

  `null` destinations are quietly ignored. AL_INVALID_ENUM is the response to errors in specifying pName. The amount of memory required in the destination depends on the actual state requested.

  Returns:
    float state described by pname will be returned.

### alGetDouble

    public static double alGetDouble(int pname)

  Like OpenGL, AL uses a simplified interface for querying global state.

  Legal values are e.g. AL_DOPPLER_FACTOR, AL_DOPPLER_VELOCITY, AL_DISTANCE_MODEL.

  `null` destinations are quietly ignored. AL_INVALID_ENUM is the response to errors in specifying pName. The amount of memory required in the destination depends on the actual state requested.

  Returns:
    double state described by pname will be returned.

### alGetInteger

    public static void alGetInteger(int pname,
                                    java.nio.IntBuffer data)

  Like OpenGL, AL uses a simplified interface for querying global state.

  Legal values are e.g. AL_DOPPLER_FACTOR, AL_DOPPLER_VELOCITY, AL_DISTANCE_MODEL.

  `null` destinations are quietly ignored. AL_INVALID_ENUM is the response to errors in specifying pName. The amount of memory required in the destination depends on the actual state requested.

  Parameters:
    `pname` - state to be queried
    `data` - Buffer to place the integers in

### alGetFloat

    public static void alGetFloat(int pname,
                                  java.nio.FloatBuffer data)

  Like OpenGL, AL uses a simplified interface for querying global state.

  Legal values are e.g. AL_DOPPLER_FACTOR, AL_DOPPLER_VELOCITY, AL_DISTANCE_MODEL.

  `null` destinations are quietly ignored. AL_INVALID_ENUM is the response to errors in specifying pName. The amount of memory required in the destination depends on the actual state requested.

  Parameters:
    `pname` - state to be queried
    `data` - Buffer to place the floats in

### alGetDouble

    public static void alGetDouble(int pname,
                                   java.nio.DoubleBuffer data)

  Like OpenGL, AL uses a simplified interface for querying global state.

  Legal values are e.g. AL_DOPPLER_FACTOR, AL_DOPPLER_VELOCITY, AL_DISTANCE_MODEL.

  `null` destinations are quietly ignored. AL_INVALID_ENUM is the response to errors in specifying pName. The amount of memory required in the destination depends on the actual state requested.

  Parameters:
    `pname` - state to be queried
    `data` - Buffer to place the doubles in

### alGetString

    public static java.lang.String alGetString(int pname)

  The application can retrieve state information global to the current AL Context. GetString will return a pointer to a constant string. Valid values for param are VERSION, RENDERER, VENDOR, and EXTENSIONS, as well as the error codes defined by AL. The application can use GetString to retrieve a string for an error code.

  Parameters:
    `pname` - The property to be returned
  Returns:
    OpenAL String property

### alGetError

    public static int alGetError()

  The AL detects only a subset of those conditions that could be considered errors. This is because in many cases error checking would adversely impact the performance of an error-free program.

  Each detectable error is assigned a numeric code. When an error is detected by AL, a flag is set and the error code is recorded. Further errors, if they occur, do not affect this recorded code. When GetError is called, the code is returned and the flag is cleared, so that a further error will again record its code. If a call to GetError returns AL_NO_ERROR then there has been no detectable error since the last call to GetError (or since the AL was initialized).

  Error codes can be mapped to strings. The GetString function returns a pointer to a constant (literal) string that is identical to the identifier used for the enumeration value, as defined in the specification.

  AL_NO_ERROR - "No Error" token.
  AL_INVALID_NAME - Invalid Name parameter.
  AL_INVALID_ENUM - Invalid parameter.
  AL_INVALID_VALUE - Invalid enum parameter value.
  AL_INVALID_OPERATION - Illegal call.
  AL_OUT_OF_MEMORY - Unable to allocate memory.

  The table summarizes the AL errors. Currently, when an error flag is set, results of AL operations are undefined only if AL_OUT_OF_MEMORY has occured. In other cases, the command generating the error is ignored so that it has no effect on AL state or output buffer contents. If the error generating command returns a value, it returns zero. If the generating command modifies values through a pointer argument, no change is made to these values. These error semantics apply only to AL errors, not to system errors such as memory access errors.

  Several error generation conditions are implicit in the description of the various AL commands. First, if a command that requires an enumerated value is passed a value that is not one of those specified as allowable for that command, the error AL_INVALID_ENUM results. This is the case even if the argument is a pointer to a symbolic constant if that value is not allowable for the given command. This will occur whether the value is allowable for other functions, or an invalid integer value.

  Integer parameters that are used as names for AL objects such as Buffers and Sources are checked for validity. If an invalid name parameter is specified in an AL command, an AL_INVALID_NAME error will be generated, and the command is ignored.

  If a negative integer is provided where an argument of type sizei is specified, the error AL_INVALID_VALUE results. The same error will result from attempts to set integral and floating point values for attributes exceeding the legal range for these. The specification does not guarantee that the implementation emits AL_INVALID_VALUE if a NaN or Infinity value is passed in for a float or double argument (as the specification does not enforce possibly expensive testing of floating point values).

  Commands can be invalid. For example, certain commands might not be applicable to a given object. There are also illegal combinations of tokens and values as arguments to a command. AL responds to any such illegal command with an AL_INVALID_OPERATION error.

  If memory is exhausted as a side effect of the execution of an AL command, either on system level or by exhausting the allocated resources at AL's internal disposal, the error AL_OUT_OF_MEMORY may be generated. This can also happen independent of recent commands if AL has to request memory for an internal task and fails to allocate the required memory from the operating system.

  Otherwise errors are generated only for conditions that are explicitely described in this specification.

  Returns:
    current error state

### alIsExtensionPresent

    public static boolean alIsExtensionPresent(java.lang.String fname)

  To verify that a given extension is available for the current context and the device it is associated with, use this method.

  A `null` name argument returns AL_FALSE, as do invalid and unsupported string tokens. A `null` deviceHandle will result in an INVALID_DEVICE error.

  Parameters:
    `fname` - String describing the desired extension
  Returns:
    true if extension is available, false if not

### alGetEnumValue

    public static int alGetEnumValue(java.lang.String ename)

  To obtain enumeration values for extensions, the application has to use GetEnumValue of an extension token. Enumeration values are defined within the AL namespace and allocated according to specification of the core API and the extensions, thus they are context-independent.

  Returns 0 if the enumeration can not be found. The presence of an enum value does not guarantee the applicability of an extension to the current context. A non-zero return indicates merely that the implementation is aware of the existence of this extension. Implementations should not attempt to return 0 to indicate that the extensions is not supported for the current context.

  Parameters:
    `ename` - String describing an OpenAL enum
  Returns:
    Actual int for the described enumeration name

### alListeneri

    public static void alListeneri(int pname,
                                   int value)

  Listener attributes are changed using the Listener group of commands.

  Parameters:
    `pname` - name of the attribute to be set
    `value` - value to set the attribute to

### alListenerf

    public static void alListenerf(int pname,
                                   float value)

  Listener attributes are changed using the Listener group of commands.

  Parameters:
    `pname` - name of the attribute to be set
    `value` - floating point value to set the attribute to

### alListener

    public static void alListener(int pname,
                                  java.nio.FloatBuffer value)

  Listener attributes are changed using the Listener group of commands.

  Parameters:
    `pname` - name of the attribute to be set
    `value` - FloatBuffer containing value to set the attribute to

### alListener3f

    public static void alListener3f(int pname,
                                    float v1,
                                    float v2,
                                    float v3)

  Listener attributes are changed using the Listener group of commands.

  Parameters:
    `pname` - name of the attribute to be set
    `v1` - value value 1
    `v2` - value value 2
    `v3` - float value 3

### alGetListeneri

    public static int alGetListeneri(int pname)

  Listener state is maintained inside the AL implementation and can be queried in full.

  Parameters:
    `pname` - name of the attribute to be retrieved
  Returns:
    int

### alGetListenerf

    public static float alGetListenerf(int pname)

  Listener state is maintained inside the AL implementation and can be queried in full.

  Parameters:
    `pname` - name of the attribute to be retrieved
  Returns:
    float

### alGetListener

    public static void alGetListener(int pname,
                                     java.nio.FloatBuffer floatdata)

  Listener state is maintained inside the AL implementation and can be queried in full.

  Parameters:
    `pname` - name of the attribute to be retrieved
    `floatdata` - Buffer to write floats to

### alGenSources

    public static void alGenSources(java.nio.IntBuffer sources)

  The application requests a number of Sources using GenSources.

  Parameters:
    `sources` - array holding sources

### alGenSources

    public static int alGenSources()

  Overloads alGenSources.

### alDeleteSources

    public static void alDeleteSources(java.nio.IntBuffer sources)

  The application requests deletion of a number of Sources by DeleteSources.

  Parameters:
    `sources` - Source array to delete from

### alDeleteSources

    public static void alDeleteSources(int source)

  Overloads alDeleteSources.

### alIsSource

    public static boolean alIsSource(int id)

  The application can verify whether a source name is valid using the IsSource query.

  Parameters:
    `id` - id of source to be testes for validity
  Returns:
    true if id is valid, false if not

### alSourcei

    public static void alSourcei(int source,
                                 int pname,
                                 int value)

  Specifies the position and other properties as taken into account during sound processing.

  Parameters:
    `source` - Source to det property on
    `pname` - property to set
    `value` - value of property

### alSourcef

    public static void alSourcef(int source,
                                 int pname,
                                 float value)

  Specifies the position and other properties as taken into account during sound processing.

  Parameters:
    `source` - Source to det property on
    `pname` - property to set
    `value` - value of property

### alSource

    public static void alSource(int source,
                                int pname,
                                java.nio.FloatBuffer value)

  Specifies the position and other properties as taken into account during sound processing.

  Parameters:
    `source` - Source to set property on
    `pname` - property to set
    `value` - FloatBuffer containing value of property

### alSource3f

    public static void alSource3f(int source,
                                  int pname,
                                  float v1,
                                  float v2,
                                  float v3)

  Specifies the position and other properties as taken into account during sound processing.

  Parameters:
    `source` - Source to set property on
    `pname` - property to set
    `v1` - value 1 of property
    `v2` - value 2 of property
    `v3` - value 3 of property

### alGetSourcei

    public static int alGetSourcei(int source,
                                   int pname)

  Source state is maintained inside the AL implementation, and the current attributes can be queried. The performance of such queries is implementation dependent, no performance guarantees are made.

  Parameters:
    `source` - source to get property from
    `pname` - name of property
  Returns:
    int

### alGetSourcef

    public static float alGetSourcef(int source,
                                     int pname)

  Source state is maintained inside the AL implementation, and the current attributes can be queried. The performance of such queries is implementation dependent, no performance guarantees are made.

  Parameters:
    `source` - source to get property from
    `pname` - name of property
  Returns:
    float

### alGetSource

    public static void alGetSource(int source,
                                   int pname,
                                   java.nio.FloatBuffer floatdata)

  Source state is maintained inside the AL implementation, and the current attributes can be queried. The performance of such queries is implementation dependent, no performance guarantees are made.

  Parameters:
    `source` - Source to get property from
    `pname` - property to get
    `floatdata` - Buffer to write floats to

### alSourcePlay

    public static void alSourcePlay(java.nio.IntBuffer sources)

  Play() applied to an AL_INITIAL Source will promote the Source to AL_PLAYING, thus the data found in the Buffer will be fed into the processing, starting at the beginning. Play() applied to a AL_PLAYING Source will restart the Source from the beginning. It will not affect the configuration, and will leave the Source in AL_PLAYING state, but reset the sampling offset to the beginning. Play() applied to a AL_PAUSED Source will resume processing using the Source state as preserved at the Pause() operation. Play() applied to a AL_STOPPED Source will propagate it to AL_INITIAL then to AL_PLAYING immediately.

  Parameters:
    `sources` - array of sources to play

### alSourcePause

    public static void alSourcePause(java.nio.IntBuffer sources)

  Pause() applied to an AL_INITIAL Source is a legal NOP. Pause() applied to a AL_PLAYING Source will change its state to AL_PAUSED. The Source is exempt from processing, its current state is preserved. Pause() applied to a AL_PAUSED Source is a legal NOP. Pause() applied to a AL_STOPPED Source is a legal NOP.

  Parameters:
    `sources` - array of sources to pause

### alSourceStop

    public static void alSourceStop(java.nio.IntBuffer sources)

  Stop() applied to an AL_INITIAL Source is a legal NOP. Stop() applied to a AL_PLAYING Source will change its state to AL_STOPPED. The Source is exempt from processing, its current state is preserved. Stop() applied to a AL_PAUSED Source will change its state to AL_STOPPED, with the same consequences as on a AL_PLAYING Source. Stop() applied to a AL_STOPPED Source is a legal NOP.

  Parameters:
    `sources` - array of sources to stop

### alSourceRewind

    public static void alSourceRewind(java.nio.IntBuffer sources)

  Rewind() applied to an AL_INITIAL Source is a legal NOP. Rewind() applied to a AL_PLAYING Source will change its state to AL_STOPPED then AL_INITIAL. The Source is exempt from processing, its current state is preserved, with the exception of the sampling offset which is reset to the beginning. Rewind() applied to a AL_PAUSED Source will change its state to AL_INITIAL, with the same consequences as on a AL_PLAYING Source. Rewind() applied to a AL_STOPPED Source promotes the Source to AL_INITIAL, resetting the sampling offset to the beginning.

  Parameters:
    `sources` - array of sources to rewind

### alSourcePlay

    public static void alSourcePlay(int source)

  Play() applied to an AL_INITIAL Source will promote the Source to AL_PLAYING, thus the data found in the Buffer will be fed into the processing, starting at the beginning. Play() applied to a AL_PLAYING Source will restart the Source from the beginning. It will not affect the configuration, and will leave the Source in AL_PLAYING state, but reset the sampling offset to the beginning. Play() applied to a AL_PAUSED Source will resume processing using the Source state as preserved at the Pause() operation. Play() applied to a AL_STOPPED Source will propagate it to AL_INITIAL then to AL_PLAYING immediately.

  Parameters:
    `source` - Source to play

### alSourcePause

    public static void alSourcePause(int source)

  Pause() applied to an AL_INITIAL Source is a legal NOP. Pause() applied to a AL_PLAYING Source will change its state to AL_PAUSED. The Source is exempt from processing, its current state is preserved. Pause() applied to a AL_PAUSED Source is a legal NOP. Pause() applied to a AL_STOPPED Source is a legal NOP.

  Parameters:
    `source` - Source to pause

### alSourceStop

    public static void alSourceStop(int source)

  Stop() applied to an AL_INITIAL Source is a legal NOP. Stop() applied to a AL_PLAYING Source will change its state to AL_STOPPED. The Source is exempt from processing, its current state is preserved. Stop() applied to a AL_PAUSED Source will change its state to AL_STOPPED, with the same consequences as on a AL_PLAYING Source. Stop() applied to a AL_STOPPED Source is a legal NOP.

  Parameters:
    `source` - Source to stop

### alSourceRewind

    public static void alSourceRewind(int source)

  Rewind() applied to an AL_INITIAL Source is a legal NOP. Rewind() applied to a AL_PLAYING Source will change its state to AL_STOPPED then AL_INITIAL. The Source is exempt from processing, its current state is preserved, with the exception of the sampling offset which is reset to the beginning. Rewind() applied to a AL_PAUSED Source will change its state to AL_INITIAL, with the same consequences as on a AL_PLAYING Source. Rewind() applied to a AL_STOPPED Source promotes the Source to AL_INITIAL, resetting the sampling offset to the beginning.

  Parameters:
    `source` - Source to rewind

### alGenBuffers

    public static void alGenBuffers(java.nio.IntBuffer buffers)

  The application requests a number of Buffers using GenBuffers.

  Parameters:
    `buffers` - holding buffers

### alGenBuffers

    public static int alGenBuffers()

  Overloads alGenBuffers.

### alDeleteBuffers

    public static void alDeleteBuffers(java.nio.IntBuffer buffers)

  The application requests deletion of a number of Buffers by calling DeleteBuffers.

  Once deleted, Names are no longer valid for use with AL function calls. Any such use will cause an AL_INVALID_NAME error. The implementation is free to defer actual release of resources.

  IsBuffer(bname) can be used to verify deletion of a buffer. Deleting bufferName 0 is a legal NOP in both scalar and vector forms of the command. The same is true for unused buffer names, e.g. such as not allocated yet, or as released already.

  Parameters:
    `buffers` - Buffer to delete from

### alDeleteBuffers

    public static void alDeleteBuffers(int buffer)

  Overloads alDeleteBuffers.

### alIsBuffer

    public static boolean alIsBuffer(int buffer)

  The application can verify whether a buffer Name is valid using the IsBuffer query.

  Parameters:
    `buffer` - buffer to be tested for validity
  Returns:
    true if supplied buffer is valid, false if not

### alBufferData

    public static void alBufferData(int buffer,
                                    int format,
                                    java.nio.ByteBuffer data,
                                    int freq)

  A special case of Buffer state is the actual sound sample data stored in asociation with the Buffer. Applications can specify sample data using BufferData.

  The data specified is copied to an internal software, or if possible, hardware buffer. The implementation is free to apply decompression, conversion, resampling, and filtering as needed. The internal format of the Buffer is not exposed to the application, and not accessible. Valid formats are AL_FORMAT_MONO8, AL_FORMAT_MONO16, AL_FORMAT_STEREO8, and AL_FORMAT_STEREO16. An implementation may expose other formats, see the chapter on Extensions for information on determining if additional formats are supported.

  Applications should always check for an error condition after attempting to specify buffer data in case an implementation has to generate an AL_OUT_OF_MEMORY or conversion related AL_INVALID_VALUE error. The application is free to reuse the memory specified by the data pointer once the call to BufferData returns. The implementation has to dereference, e.g. copy, the data during BufferData execution.

  Parameters:
    `buffer` - Buffer to fill
    `format` - format sound data is in
    `data` - location of data
    `freq` - frequency of data

### alBufferData

    public static void alBufferData(int buffer,
                                    int format,
                                    java.nio.IntBuffer data,
                                    int freq)

  A special case of Buffer state is the actual sound sample data stored in asociation with the Buffer. Applications can specify sample data using BufferData.

  The data specified is copied to an internal software, or if possible, hardware buffer. The implementation is free to apply decompression, conversion, resampling, and filtering as needed. The internal format of the Buffer is not exposed to the application, and not accessible. Valid formats are AL_FORMAT_MONO8, AL_FORMAT_MONO16, AL_FORMAT_STEREO8, and AL_FORMAT_STEREO16. An implementation may expose other formats, see the chapter on Extensions for information on determining if additional formats are supported.

  Applications should always check for an error condition after attempting to specify buffer data in case an implementation has to generate an AL_OUT_OF_MEMORY or conversion related AL_INVALID_VALUE error. The application is free to reuse the memory specified by the data pointer once the call to BufferData returns. The implementation has to dereference, e.g. copy, the data during BufferData execution.

  Parameters:
    `buffer` - Buffer to fill
    `format` - format sound data is in
    `data` - location of data
    `freq` - frequency of data

### alBufferData

    public static void alBufferData(int buffer,
                                    int format,
                                    java.nio.ShortBuffer data,
                                    int freq)

  A special case of Buffer state is the actual sound sample data stored in asociation with the Buffer. Applications can specify sample data using BufferData.

  The data specified is copied to an internal software, or if possible, hardware buffer. The implementation is free to apply decompression, conversion, resampling, and filtering as needed. The internal format of the Buffer is not exposed to the application, and not accessible. Valid formats are AL_FORMAT_MONO8, AL_FORMAT_MONO16, AL_FORMAT_STEREO8, and AL_FORMAT_STEREO16. An implementation may expose other formats, see the chapter on Extensions for information on determining if additional formats are supported.

  Applications should always check for an error condition after attempting to specify buffer data in case an implementation has to generate an AL_OUT_OF_MEMORY or conversion related AL_INVALID_VALUE error. The application is free to reuse the memory specified by the data pointer once the call to BufferData returns. The implementation has to dereference, e.g. copy, the data during BufferData execution.

  Parameters:
    `buffer` - Buffer to fill
    `format` - format sound data is in
    `data` - location of data
    `freq` - frequency of data

### alGetBufferi

    public static int alGetBufferi(int buffer,
                                   int pname)

  Buffer state is maintained inside the AL implementation and can be queried in full.
  ALC_FREQUENCY - specified in samples per second, i.e. units of Hertz [Hz].
  ALC_SIZE - Size in bytes of the buffer data.

  Parameters:
    `buffer` - buffer to get property from
    `pname` - name of property to retrieve

### alGetBufferf

    public static float alGetBufferf(int buffer,
                                     int pname)

  Buffer state is maintained inside the AL implementation and can be queried in full.
  ALC_FREQUENCY - specified in samples per second, i.e. units of Hertz [Hz].
  ALC_SIZE - Size in bytes of the buffer data.

  Parameters:
    `buffer` - buffer to get property from
    `pname` - name of property to retrieve
  Returns:
    float

### alSourceQueueBuffers

    public static void alSourceQueueBuffers(int source,
                                            java.nio.IntBuffer buffers)

  The application can queue up one or multiple buffer names using SourceQueueBuffers. The buffers will be queued in the sequence in which they appear in the array.

  This command is legal on a Source in any state (to allow for streaming, queueing has to be possible on a AL_PLAYING Source). Queues are read-only with exception of the unqueue operation. The Buffer Name AL_NONE (i.e. 0) can be queued.

  Parameters:
    `source` - source to queue buffers onto
    `buffers` - buffers to be queued

### alSourceQueueBuffers

    public static void alSourceQueueBuffers(int source,
                                            int buffer)

  Overloads alSourceQueueBuffers.

### alSourceUnqueueBuffers

    public static void alSourceUnqueueBuffers(int source,
                                              java.nio.IntBuffer buffers)

  Once a queue entry for a buffer has been appended to a queue and is pending processing, it should not be changed. Removal of a given queue entry is not possible unless either the Source is AL_STOPPED (in which case then entire queue is considered processed), or if the queue entry has already been processed (AL_PLAYING or AL_PAUSED Source).

  The Unqueue command removes a number of buffers entries that have finished processing, in the order of appearance, from the queue. The operation will fail if more buffers are requested than available, leaving the destination arguments unchanged. An AL_INVALID_VALUE error will be thrown. If no error, the destination argument will have been updated accordingly.

  Parameters:
    `source` - source to unqueue buffers from
    `buffers` - IntBuffer containing list of names that were unqueued

### alSourceUnqueueBuffers

    public static int alSourceUnqueueBuffers(int source)

  Overloads alSourceUnqueueBuffers.

### alDistanceModel

    public static void alDistanceModel(int value)

  Samples usually use the entire dynamic range of the chosen format/encoding, independent of their real world intensity. In other words, a jet engine and a clockwork both will have samples with full amplitude. The application will then have to adjust Source AL_GAIN accordingly to account for relative differences.

  Source AL_GAIN is then attenuated by distance. The effective attenuation of a Source depends on many factors, among which distance attenuation and source and Listener AL_GAIN are only some of the contributing factors. Even if the source and Listener AL_GAIN exceed 1.0 (amplification beyond the guaranteed dynamic range), distance and other attenuation might ultimately limit the overall AL_GAIN to a value below 1.0.

  AL currently supports three modes of operation with respect to distance attenuation. It supports two distance-dependent attenuation models, one which is similar to the IASIG I3DL2 (and DS3D) model. The application choses one of these two models (or can chose to disable distance-dependent attenuation effects model) on a per-context basis.

  Legal arguments are AL_NONE, AL_INVERSE_DISTANCE, and AL_INVERSE_DISTANCE_CLAMPED.
  AL_NONE bypasses all distance attenuation calculation for all Sources. The implementation is expected to optimize this situation.
  AL_INVERSE_DISTANCE_CLAMPED is the DS3D model, with AL_REFERENCE_DISTANCE indicating both the reference distance and the distance below which gain will be clamped.
  AL_INVERSE_DISTANCE is equivalent to the DS3D model with the exception that AL_REFERENCE_DISTANCE does not imply any clamping.
  The AL implementation is still free to apply any range clamping as necessary. The current distance model chosen can be queried using GetIntegerv and AL_DISTANCE_MODEL.

  Parameters:
    `value` - distance model to be set

### alDopplerFactor

    public static void alDopplerFactor(float value)

  The Doppler Effect depends on the velocities of Source and Listener relative to the medium, and the propagation speed of sound in that medium. The application might want to emphasize or de-emphasize the Doppler Effect as physically accurate calculation might not give the desired results. The amount of frequency shift (pitch change) is proportional to the speed of listener and source along their line of sight. The application can increase or decrease that frequency shift by specifying the scaling factor AL should apply to the result of the calculation.
  The Doppler Effect as implemented by AL is described by the formula below. Effects of the medium (air, water) moving with respect to listener and source are ignored. AL_DOPPLER_VELOCITY is the propagation speed relative to which the Source velocities are interpreted.

               VD: AL_DOPPLER_VELOCITY
               DF: AL_DOPPLER_FACTOR
               vl: Listener velocity (scalar, projected on source-listener vector)
               vs: Source verlocity (scalar, projected on source-listener vector)
               f: Frequency in sample
               f': effective Doppler shifted frequency

               f' = DF * f * (VD-vl)/(VD+vs)

               vl<0, vs>0 : source and listener approaching each other
               vl>0, vs<0 : source and listener moving away from each other

  The implementation has to clamp the projected Listener velocity vl, if abs(vl) is greater or equal VD. It similarly has to clamp the projected Source velocity vs if abs(vs) is greater or equal VD.

  There are two API calls global to the current context that provide control of the two related parameters.

  AL_DOPPLER_FACTOR is a simple scaling to exaggerate or deemphasize the Doppler (pitch) shift resulting from the calculation.

  A negative value will result in an AL_INVALID_VALUE error, the command is then ignored. The default value is 1. The current setting can be queried using GetFloatv and AL_DOPPLER_FACTOR. The implementation is free to optimize the case of AL_DOPPLER_FACTOR being set to zero, as this effectively disables the effect.

  Parameters:
    `value` - Doppler scale value to set

### alDopplerVelocity

    public static void alDopplerVelocity(float value)

  The Doppler Effect depends on the velocities of Source and Listener relative to the medium, and the propagation speed of sound in that medium. The application might want to emphasize or de-emphasize the Doppler Effect as physically accurate calculation might not give the desired results. The amount of frequency shift (pitch change) is proportional to the speed of listener and source along their line of sight. The application can increase or decrease that frequency shift by specifying the scaling factor AL should apply to the result of the calculation.
  The Doppler Effect as implemented by AL is described by the formula below. Effects of the medium (air, water) moving with respect to listener and source are ignored. AL_DOPPLER_VELOCITY is the propagation speed relative to which the Source velocities are interpreted.

               VD: AL_DOPPLER_VELOCITY
               DF: AL_DOPPLER_FACTOR
               vl: Listener velocity (scalar, projected on source-listener vector)
               vs: Source verlocity (scalar, projected on source-listener vector)
               f: Frequency in sample
               f': effective Doppler shifted frequency

               f' = DF * f * (VD-vl)/(VD+vs)

               vl<0, vs>0 : source and listener approaching each other
               vl>0, vs<0 : source and listener moving away from each other

  The implementation has to clamp the projected Listener velocity vl, if abs(vl) is greater or equal VD. It similarly has to clamp the projected Source velocity vs if abs(vs) is greater or equal VD.

  There are two API calls global to the current context that provide control of the two related parameters.

  AL_DOPPLER_VELOCITY allows the application to change the reference (propagation) velocity used in the Doppler Effect calculation. This permits the application to use a velocity scale appropriate to its purposes.

  A negative or zero value will result in an AL_INVALID_VALUE error, the command is then ignored. The default value is 1. The current setting can be queried using GetFloatv and AL_DOPPLER_VELOCITY.

  Parameters:
    `value` - Doppler velocity value to set

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