SoVRMLSound Class Reference
VRML97 Classes | 3D Sound Support Classes

The SoVRMLSound class is used to represent a sound source. More...

`#include <Inventor/VRMLnodes/SoVRMLSound.h>`

Inheritance diagram for SoVRMLSound:

## Public Member Functions

virtual SoType | getTypeId (void) const
| SoVRMLSound (void)
void | setDopplerVelocity (float velocity)
float | getDopplerVelocity (void) const
void | setDopplerFactor (float factor)
float | getDopplerFactor (void) const
void | startPlaying (SoPath *path, void *userdataptr)
void | stopPlaying (SoPath *path, void *userdataptr)
void | setBufferingProperties (int bufferLength, int numBuffers, SbTime sleepTime)
void | getBufferingProperties (int &bufferLength, int &numBuffers, SbTime &sleepTime)
virtual void | audioRender (SoAudioRenderAction *action)
Public Member Functions inherited from SoNode
void | setOverride (const SbBool state)
SbBool | isOverride (void) const
void | setNodeType (const NodeType type)
NodeType | getNodeType (void) const
virtual SoNode * | copy (SbBool copyconnections=FALSE) const
virtual SbBool | affectsState (void) const
virtual void | doAction (SoAction *action)
virtual void | GLRender (SoGLRenderAction *action)
virtual void | GLRenderBelowPath (SoGLRenderAction *action)
virtual void | GLRenderInPath (SoGLRenderAction *action)
virtual void | GLRenderOffPath (SoGLRenderAction *action)
virtual void | callback (SoCallbackAction *action)
virtual void | getBoundingBox (SoGetBoundingBoxAction *action)
virtual void | getMatrix (SoGetMatrixAction *action)
virtual void | handleEvent (SoHandleEventAction *action)
virtual void | pick (SoPickAction *action)
virtual void | rayPick (SoRayPickAction *action)
virtual void | search (SoSearchAction *action)
virtual void | write (SoWriteAction *action)
virtual void | getPrimitiveCount (SoGetPrimitiveCountAction *action)
virtual void | grabEventsSetup (void)
virtual void | grabEventsCleanup (void)
virtual void | startNotify (void)
virtual void | notify (SoNotList *l)
SbUniqueId | getNodeId (void) const
virtual SoChildList * | getChildren (void) const
virtual void | writeInstance (SoOutput *out)
virtual SoNode * | addToCopyDict (void) const
virtual void | copyContents (const SoFieldContainer *from, SbBool copyconnections)
virtual SoFieldContainer * | copyThroughConnection (void) const
Public Member Functions inherited from SoFieldContainer
void | setToDefaults (void)
SbBool | hasDefaultValues (void) const
SbBool | fieldsAreEqual (const SoFieldContainer *container) const
void | copyFieldValues (const SoFieldContainer *container, SbBool copyconnections=FALSE)
SbBool | set (const char *const fielddata)
void | get (SbString &fielddata)
virtual int | getFields (SoFieldList &l) const
virtual int | getAllFields (SoFieldList &l) const
virtual SoField * | getField (const SbName &name) const
virtual SoField * | getEventIn (const SbName &name) const
virtual SoField * | getEventOut (const SbName &name) const
SbBool | getFieldName (const SoField *const field, SbName &name) const
SbBool | enableNotify (const SbBool flag)
SbBool | isNotifyEnabled (void) const
SbBool | set (const char *fielddata, SoInput *input)
void | get (SbString &fielddata, SoOutput *out)
virtual SbBool | validateNewFieldValue (SoField *field, void *newval)
virtual void | addWriteReference (SoOutput *out, SbBool isfromfield=FALSE)
SbBool | getIsBuiltIn (void) const
virtual void | getFieldsMemorySize (size_t &managed, size_t &unmanaged) const
void | setUserData (void *userdata) const
void * | getUserData (void) const
Public Member Functions inherited from SoBase
void | ref (void) const
void | unref (void) const
void | unrefNoDelete (void) const
int32_t | getRefCount (void) const
void | touch (void)
SbBool | isOfType (SoType type) const
| Returns `TRUE` if the type of this object is either of the same type or inherited from type.
virtual SbName | getName (void) const
virtual void | setName (const SbName &newname)
void | addAuditor (void *const auditor, const SoNotRec::Type type)
void | removeAuditor (void *const auditor, const SoNotRec::Type type)
const SoAuditorList & | getAuditors (void) const
SbBool | shouldWrite (void)
void | assertAlive (void) const

## Static Public Member Functions

static SoType | getClassTypeId (void)
static void | initClass (void)
static void | setDefaultBufferingProperties (int bufferLength, int numBuffers, SbTime sleepTime)
Static Public Member Functions inherited from SoNode
static uint32_t | getCompatibilityTypes (const SoType &nodetype)
static SoType | getClassTypeId (void)
static SoNode * | getByName (const SbName &name)
static int | getByName (const SbName &name, SoNodeList &l)
static void | initClass (void)
| Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system.
static void | initClasses (void)
static SbUniqueId | getNextNodeId (void)
static int | getActionMethodIndex (const SoType type)
static void | getBoundingBoxS (SoAction *action, SoNode *node)
static void | GLRenderS (SoAction *action, SoNode *node)
static void | callbackS (SoAction *action, SoNode *node)
static void | getMatrixS (SoAction *action, SoNode *node)
static void | handleEventS (SoAction *action, SoNode *node)
static void | pickS (SoAction *action, SoNode *node)
static void | rayPickS (SoAction *action, SoNode *node)
static void | searchS (SoAction *action, SoNode *node)
static void | writeS (SoAction *action, SoNode *node)
static void | audioRenderS (SoAction *action, SoNode *node)
static void | getPrimitiveCountS (SoAction *action, SoNode *node)
Static Public Member Functions inherited from SoFieldContainer
static void | initClass (void)
| Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system.
static SoType | getClassTypeId (void)
| This static method returns the SoType object associated with objects of this class.
static void | cleanupClass (void)
static void | initCopyDict (void)
static void | addCopy (const SoFieldContainer *orig, const SoFieldContainer *copy)
static SoFieldContainer * | checkCopy (const SoFieldContainer *orig)
static SoFieldContainer * | findCopy (const SoFieldContainer *orig, const SbBool copyconnections)
static void | copyDone (void)
Static Public Member Functions inherited from SoBase
static void | initClass (void)
| Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system.
static SoType | getClassTypeId (void)
| This static method returns the SoType object associated with objects of this class.
static void | addName (SoBase *const base, const char *const name)
static void | removeName (SoBase *const base, const char *const name)
static void | incrementCurrentWriteCounter (void)
static void | decrementCurrentWriteCounter (void)
static SoBase * | getNamedBase (const SbName &name, SoType type)
static int | getNamedBases (const SbName &name, SoBaseList &baselist, SoType type)
static SbBool | read (SoInput *input, SoBase *&base, SoType expectedtype)
static void | setInstancePrefix (const SbString &c)
static void | setTraceRefs (SbBool trace)
static SbBool | getTraceRefs (void)
static SbBool | connectRoute (SoInput *input, const SbName &fromnodename, const SbName &fromfieldname, const SbName &tonodename, const SbName &tofieldname)
static SbBool | readRoute (SoInput *input)

## Public Attributes

SoSFNode | source
SoSFFloat | intensity
SoSFFloat | priority
SoSFVec3f | location
SoSFVec3f | direction
SoSFFloat | minFront
SoSFFloat | maxFront
SoSFFloat | minBack
SoSFFloat | maxBack
SoSFBool | spatialize
SoSFFloat | dopplerFactor
SoSFFloat | dopplerVelocity

## Protected Member Functions

virtual const SoFieldData * | getFieldData (void) const
virtual | ~SoVRMLSound (void)
Protected Member Functions inherited from SoNode
| SoNode (void)
virtual | ~SoNode ()
virtual SbBool | readInstance (SoInput *in, unsigned short flags)
Protected Member Functions inherited from SoFieldContainer
| SoFieldContainer (void)
virtual | ~SoFieldContainer ()
Protected Member Functions inherited from SoBase
| SoBase (void)
virtual | ~SoBase ()
virtual void | destroy (void)
SbBool | hasMultipleWriteRefs (void) const
SbBool | writeHeader (SoOutput *out, SbBool isgroup, SbBool isengine) const
void | writeFooter (SoOutput *out) const
virtual const char * | getFileFormatName (void) const
virtual SoNotRec | createNotRec (void)

## Static Protected Member Functions

static const SoFieldData ** | getFieldDataPtr (void)
Static Protected Member Functions inherited from SoNode
static const SoFieldData ** | getFieldDataPtr (void)
static void | setNextActionMethodIndex (int index)
static int | getNextActionMethodIndex (void)
static void | incNextActionMethodIndex (void)
static void | setCompatibilityTypes (const SoType &nodetype, const uint32_t bitmask)
Static Protected Member Functions inherited from SoBase
static uint32_t | getCurrentWriteCounter (void)
static void | staticDataLock (void)
static void | staticDataUnlock (void)

## Additional Inherited Members

Public Types inherited from SoNode

enum

NodeType {
INVENTOR = 0x0000 , VRML1 = 0x0001 , VRML2 = 0x0002 , INVENTOR_1 = 0x0004 ,
INVENTOR_2_0 = 0x0008 , INVENTOR_2_1 = 0x0010 , INVENTOR_2_5 = 0x0020 , INVENTOR_2_6 = 0x0040 ,
COIN_1_0 = 0x0080 , COIN_2_0 = 0x0100 , EXTENSION = 0x0200 , COIN_2_2 = 0x0400 ,
COIN_2_3 = 0x0800 , COIN_2_4 = 0x1000 , INVENTOR_5_0 = 0x2000 , COIN_2_5 = 0x4000 ,
COIN_3_0 = 0x8000 , INVENTOR_6_0 = 0x10000 , COIN_4_0 = 0x20000
}

Protected Types inherited from SoBase
enum | BaseFlags { IS_ENGINE = 0x01 , IS_GROUP = 0x02 }
Protected Attributes inherited from SoNode
SbUniqueId | uniqueId
Protected Attributes inherited from SoFieldContainer
SbBool | isBuiltIn
Static Protected Attributes inherited from SoNode
static SbUniqueId | nextUniqueId = 1
static int | nextActionMethodIndex = 0

## Detailed Description

The SoVRMLSound class is used to represent a sound source.

The detailed class documentation is taken verbatim from the VRML97 standard (ISO/IEC 14772-1:1997). It is copyright The Web3D Consortium, and is used by permission of the Consortium:

    Sound {
      exposedField SFVec3f  direction     0 0 1   # (-inf, inf)
      exposedField SFFloat  intensity     1       # [0,1]
      exposedField SFVec3f  location      0 0 0   # (-inf, inf)
      exposedField SFFloat  maxBack       10      # [0,inf)
      exposedField SFFloat  maxFront      10      # [0,inf)
      exposedField SFFloat  minBack       1       # [0,inf)
      exposedField SFFloat  minFront      1       # [0,inf)
      exposedField SFFloat  priority      0       # [0,1]
      exposedField SFNode   source        NULL
      field        SFBool   spatialize    TRUE
    }

The Sound node specifies the spatial presentation of a sound in a VRML scene. The sound is located at a point in the local coordinate system and emits sound in an elliptical pattern (defined by two ellipsoids). The ellipsoids are oriented in a direction specified by the direction field. The shape of the ellipsoids may be modified to provide more or less directional focus from the location of the sound.

The source field specifies the sound source for the Sound node. If the source field is not specified, the Sound node will not emit audio. The source field shall specify either an AudioClip node or a MovieTexture node. If a MovieTexture node is specified as the sound source, the MovieTexture shall refer to a movie format that supports sound (e.g., MPEG1-Systems).

The intensity field adjusts the loudness (decibels) of the sound emitted by the Sound node (note: this is different from the traditional definition of intensity with respect to sound).

The intensity field has a value that ranges from 0.0 to 1.0 and specifies a factor which shall be used to scale the normalized sample data of the sound source during playback. A Sound node with an intensity of 1.0 shall emit audio at its maximum loudness (before attenuation), and a Sound node with an intensity of 0.0 shall emit no audio. Between these values, the loudness should increase linearly from a -20 dB change approaching an intensity of 0.0 to a 0 dB change at an intensity of 1.0.

The priority field provides a hint for the browser to choose which sounds to play when there are more active Sound nodes than can be played at once due to either limited system resources or system load. 7.3.4, Sound priority, attenuation, and spatialization (/documents/specifications/14772/V2.0/part1/concepts.html#7.3.4), describes a recommended algorithm for determining which sounds to play under such circumstances. The priority field ranges from 0.0 to 1.0, with 1.0 being the highest priority and 0.0 the lowest priority.

The location field determines the location of the sound emitter in the local coordinate system. A Sound node's output is audible only if it is part of the traversed scene. Sound nodes that are descended from LOD, Switch, or any grouping or prototype node that disables traversal (i.e., drawing) of its children are not audible unless they are traversed. If a Sound node is disabled by a Switch or LOD node, and later it becomes part of the traversal again, the sound shall resume where it would have been had it been playing continuously.

The Sound node has an inner ellipsoid that defines a volume of space in which the maximum level of the sound is audible. Within this ellipsoid, the normalized sample data is scaled by the intensity field and there is no attenuation. The inner ellipsoid is defined by extending the direction vector through the location.

The minBack and minFront fields specify distances behind and in front of the location along the direction vector respectively. The inner ellipsoid has one of its foci at location (the second focus is implicit) and intersects the direction vector at minBack and minFront. The Sound node has an outer ellipsoid that defines a volume of space that bounds the audibility of the sound. No sound can be heard outside of this outer ellipsoid.

The outer ellipsoid is defined by extending the direction vector through the location. The maxBack and maxFront fields specify distances behind and in front of the location along the direction vector respectively. The outer ellipsoid has one of its foci at location (the second focus is implicit) and intersects the direction vector at maxBack and maxFront. The minFront, maxFront, minBack, and maxBack fields are defined in local coordinates, and shall be greater than or equal to zero. The minBack field shall be less than or equal to maxBack, and minFront shall be less than or equal to maxFront. The ellipsoid parameters are specified in the local coordinate system but the ellipsoids' geometry is affected by ancestors' transformations.

Between the two ellipsoids, there shall be a linear attenuation ramp in loudness, from 0 dB at the minimum ellipsoid to -20 dB at the maximum ellipsoid: attenuation = -20 × (d' / d") where d' is the distance along the location-to-viewer vector, measured from the transformed minimum ellipsoid boundary to the viewer, and d" is the distance along the location-to-viewer vector from the transformed minimum ellipsoid boundary to the transformed maximum ellipsoid boundary (see Figure 6.14).

Figure 6.14 – Sound node geometry

The spatialize field specifies if the sound is perceived as being directionally located relative to the viewer. If the spatialize field is TRUE and the viewer is located between the transformed inner and outer ellipsoids, the viewer's direction and the relative location of the Sound node should be taken into account during playback. Details outlining the minimum required spatialization functionality can be found in 7.3.4, Sound priority, attenuation, and spatialization (/documents/specifications/14772/V2.0/part1/concepts.html#7.3.4), If the spatialize field is FALSE, then directional effects are ignored, but the ellipsoid dimensions and intensity will still affect the loudness of the sound. If the sound source is multi-channel (e.g., stereo), then the source should retain its channel separation during playback.

## Constructor & Destructor Documentation

## SoVRMLSound()

SoVRMLSound::SoVRMLSound | ( | void |  | ) |

Constructor.

## ~SoVRMLSound()

SoVRMLSound::~SoVRMLSound | ( | void |  | ) |

protected virtual

Destructor.

## Member Function Documentation

## getClassTypeId()

SoType SoVRMLSound::getClassTypeId | ( | void |  | ) |

static

This static method returns the SoType object associated with objects of this class.

## getTypeId()

SoType SoVRMLSound::getTypeId | ( | void |  | ) | const

virtual

Returns the type identification of an object derived from a class inheriting SoBase. This is used for runtime type checking and "downward" casting.

Implements SoBase.

## getFieldDataPtr()

const SoFieldData ** SoVRMLSound::getFieldDataPtr | ( | void |  | ) |

static protected

This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.
Returns the SoFieldData class which holds information about fields in this node.

## getFieldData()

const SoFieldData * SoVRMLSound::getFieldData | ( | void |  | ) | const

protected virtual

Returns a pointer to the class-wide field data storage object for this instance. If no fields are present, returns `NULL`.

Reimplemented from SoFieldContainer.

## initClass()

void SoVRMLSound::initClass | ( | void |  | ) |

static

## setDopplerVelocity()

void SoVRMLSound::setDopplerVelocity | ( | float | velocity | ) |

Sets the doppler velocity relative to the global coordinate system. Not implemented yet.

## getDopplerVelocity()

float SoVRMLSound::getDopplerVelocity | ( | void |  | ) | const

Returns the doppler velocity relative to the global coordinate system. Not implemented yet.

## setDopplerFactor()

void SoVRMLSound::setDopplerFactor | ( | float | factor | ) |

Sets the doppler factor. Not implemented yet.

## getDopplerFactor()

float SoVRMLSound::getDopplerFactor | ( | void |  | ) | const

Returns the doppler factor. Not implemented yet.

## startPlaying()

void SoVRMLSound::startPlaying | ( | SoPath * | path,
|  | void * | userdataptr )

Starts playing the sound. Not implemented yet. Please use the fields of SoVRMLAudioClip to start and stop sounds.

## stopPlaying()

void SoVRMLSound::stopPlaying | ( | SoPath * | path,
|  | void * | userdataptr )

Stops playing the sound. Not implemented yet. Please use the fields of SoVRMLAudioClip to start and stop sounds.

## audioRender()

void SoVRMLSound::audioRender | ( | SoAudioRenderAction * | action | ) |

virtual

Action method for SoAudioRenderAction.

Does common processing for SoAudioRenderAction action instances.

Reimplemented from SoNode.

## Member Data Documentation

## source

SoSFNode SoVRMLSound::source

The audio stream. Either an SoVRMLAudioClip or an SoVRMLMovieTexture. Coin only supports playback of audio from SoVRMLAudioClip, not from SoVRMLMovieTexture.

## intensity

SoSFFloat SoVRMLSound::intensity

Sound intensity. A value from 0 to 1. Default value is 1.

## priority

SoSFFloat SoVRMLSound::priority

Browser hint for how important the sound is. A value from 0 to

1. Default value is 0. Coin does not yet support this field.

## location

SoSFVec3f SoVRMLSound::location

The sound position. Default value is (0, 0, 0).

## direction

SoSFVec3f SoVRMLSound::direction

Sound direction. Default value is (0, 0, 1).

## minFront

SoSFFloat SoVRMLSound::minFront

Inner ellipse front value. Default value is 1.

## maxFront

SoSFFloat SoVRMLSound::maxFront

Outer ellipse front value. Default value is 10.

## minBack

SoSFFloat SoVRMLSound::minBack

Inner ellipse back value. Default value is 1.

## maxBack

SoSFFloat SoVRMLSound::maxBack

Outer ellips back value. Default value is 10.

## spatialize

SoSFBool SoVRMLSound::spatialize

Set to TRUE if sound should be spatialized (directional effects are applied) with respect to the viewer. Distance attenuation is always applied. Default value is TRUE.

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

- SoVRMLSound.h
- Sound.cpp