Audio Player Element

Modified on 2018/07/16 02:07 by Administrator — Categorized as: Auditory Stimuli, Base Elements, Elements

Summary ¶

	Audio Player
Info
Category:	Audio Stimuli		AddIn:	Base Layer
Creator:	OkazoLab		Scope:	Parent event
Owns Snippets:	None		Usage:	Snippets

Properties ¶

Name	Description	Constraints	Type	On runtime change
Settings
Test Audio	Click to test playback of the current audio clip	Design Time..	Boolean
Playback Mode	Play Method	Normal..	stPlay..
Playback
Volume	Volume, from ground (0) to full (100), of the audio clip	Normal..	Int32
Balance	Stereophonic balance, left (-100) to right (100), of the audio clip	Normal..	Int32
Duration	The duration of the current audio clip in ms.	Status..	Double
Playback Position	The current playing position (percentages, 0..100, to the total duration) of the audio clip.	Normal..	Double
Is Playing	Indicates the playback state of an audio clip. Can be used to control playback process, e.g. pause it, at runtimeChange in runtime causes toggling between the play/pause states.	Normal..	Boolean
Material List
Selected Index	Defines an index of the active item in the material list of this element	Normal..	Int32
Selected Item	Defines a name if the active library item in the material list of this element	Normal..	String
Item Count	Returns the total number of material items in the list of this element	Status..	Int32
Control
Is Enabled	If set to false the element is completely omitted when the experiment is run	Design Time..	Boolean
Title	Title of the element	Design Time..	String

¶

Audio Player Element allows a playback of audio clips stored in Material Library. Various audio formats, such as mp3 and midi, are supported in contrast to the Wave Player and Direct Sound elements, which can work only with clip in the WAVE format. The Audio Player element provides all playback controls and onset playback synchronization. The element supports a switchable stimulus list, when multiple clips are loaded from Material Library into the element.

Table of Contents [Hide/Show]

Summary
Properties

Description
Snapshots
Practical Use

Description ¶

Selecting Event – Add Element command and selecting Audio Player under the Audio Stimuli category will add a new Audio Player element. The audio clip element can play audio files, of different formats, stored as resources in the Material Library. The element is designed for delivering audio feedback to participants or playing voice instructions. Several audio items can be loaded into an element's resource list, in order to make a switchable stimuli set. Different audio formats are supported provided that the appropriate codecs are installed on the system being used (the files have to be played correctly by other software players). The playback of some audio formats may be delayed due to a decoding script run by a background codec program, so this should be checked where necessary.

Snapshots ¶

Snapshot 1

Snapshot 1

Snapshot 2

Snapshot 2

Practical Use ¶

If, under the Properties tab, the Behaviour property is set to pmOnce or pmLoop, the start of playback is aligned with the activation of the parent event. Playback can also be controlled manually by setting the property IsPlaying to true or false at the runtime. Other playback properties such as the volume, balance and playing position also can be adjusted dynamically.