vbaplsinit — Configures VBAP output according to loudspeaker parameters.
idim -- dimensionality of loudspeaker array. Either 2 or 3.
ilsnum -- number of loudspeakers. In two dimensions, the number can vary from 2 to 16. In three dimensions, the number can vary from 3 and 16.
idir1, idir2, ..., idir32 -- directions of loudspeakers. Number of directions must be less than or equal to 16. In two-dimensional loudspeaker positioning, idirn is the azimuth angle respective to nth channel. In three-dimensional loudspeaker positioning, fields are the azimuth and elevation angles of each loudspeaker consequently (azi1, ele1, azi2, ele2, etc.).
VBAP distributes the signal using loudspeaker data configured with vbaplsinit. The signal is applied to, at most, two loudspeakers in 2-D loudspeaker configurations, and three loudspeakers in 3-D loudspeaker configurations. If the virtual source is panned outside the region spanned by loudspeakers, the nearest loudspeakers are used in panning.
Here is an example of the vbaplsinit opcode. It uses the file vbaplsinit.csd.
Example 881. Example of the vbaplsinit opcode.
See the sections Real-time Audio and Command Line Flags for more information on using command line flags.
<CsoundSynthesizer> <CsOptions> ; Select audio/midi flags here according to platform -odac ;;;realtime audio out ;-iadc ;;;uncomment -iadc if realtime audio input is needed too ; For Non-realtime ouput leave only the line below: ; -o vbaplsinit.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> sr = 44100 ksmps = 32 nchnls = 8 0dbfs = 1 vbaplsinit 2, 8, 0, 45, 90, 180, 270, 0, 0, 0 ;5 speakers for 5.1 amps instr 1 asig diskin2 "beats.wav", 1, 0, 1 ;loop beats.wav kazim line 1, p3, 355 a1,a2,a3,a4,a5,a6,a7,a8 vbap8 asig, kazim, 0, 1 ;change azimuth of soundsource ; Speaker mapping aFL = a1 ; Front Left aMF = a5 ; Mid Front aFR = a2 ; Front Right aBL = a3 ; Back Left aBR = a4 ; Back Right outo aFL,aFR,aBL,aBR,aMF,a6,a7,a8 ;a6, a7 and a8 are dummies endin </CsInstruments> <CsScore> i 1 0 5 e </CsScore> </CsoundSynthesizer>
See the other entries of the vbap opcodes for different examples.