GetSoundFFTData: Difference between revisions

Latest revision as of 16:36, 26 September 2021

This function gets the fast fourier transform data for an audio stream which is a table of floats representing the current audio frame. This allows things like visualisations. A fast fourier transform generates a table of all the frequencies of the current audio frame which starts at the bass end of the spectrum to mids to highs in that order. Should you have any problems there is an example resource located on the resources repository: Visualiser

Just type "startmusic mystreamurl" in your console and it will play on the cinema billboard near A51. If the element is a player, this function will use the players voice.

Syntax

table getSoundFFTData ( element sound, int iSamples [, int iBands = 0 ] )

OOP Syntax Help! I don't understand this!

Method: sound:getFFTData(...)

Required Arguments

sound: a sound element that is created using playSound or playSound3D. Streams are also supported
iSamples: allowed samples are 256, 512, 1024, 2048, 4096, 8192 and 16384.

Optional Arguments

iBands: post processing option allows you to split the samples into the desired amount of bands or bars so if you only need 5 bars this saves a lot of cpu power compared to trying to do it in Lua.

Returns

Returns a table of iSamples/2 (or iBands if iBands is used) floats representing the current audio frame. Returns false if the sound is not playing yet or hasn't buffered in the case of streams.

Example

Click to collapse [-]

Client

soundHandler = playSound ( "sound.wav" )

function onSoundPlayRender ( )
    if ( soundHandler ) then
        local soundFFT = getSoundFFTData ( soundHandler, 2048, 256 )
	if ( soundFFT ) then
            for i = 0, 255 do -- Data starts from index 0
                dxDrawRectangle ( i, 0, 1, math.sqrt ( soundFFT[i] ) * 256 )
            end
        end
    end
end
addEventHandler ( "onClientRender", getRootElement(), onSoundPlayRender )

Changelog

Version	Description

1.3.2

Added player element to use a players voice

@@ Line 1: / Line 1: @@
 __NOTOC__
 {{Client function}}
-This function gets the fast fourier transform data for an audio stream which is a table of floats representing the current audio frame.
+This function gets the fast fourier transform data for an audio stream which is a table of floats representing the current audio frame. This allows things like visualisations.
-This allows things like visualisations.
+A fast fourier transform generates a table of all the frequencies of the current audio frame which starts at the bass end of the spectrum to mids to highs in that order.
+Should you have any problems there is an example resource located on the resources repository:
+[https://github.com/multitheftauto/mtasa-resources/tree/master/%5Bgameplay%5D/visualiser Visualiser]
-a fast fourier transform generates a table of all the frequencies of the current audio frame which starts at the bass end of the spectrum to mids to highs in that order
+Just type "startmusic mystreamurl" in your console and it will play on the cinema billboard near A51. If the element is a player, this function will use the players voice.
-Should you have any problems there is an example resource located on the resource svn here:
-[https://code.google.com/p/mtasa-resources/source/browse/#svn%2Ftrunk%2F%5Bgameplay%5D%2FVisualiser Visualiser]
-just type "startmusic mystreamurl" in your console and it will play on the cinema billboard near A51
-If the element is a player, this function will use the players voice.
 ==Syntax==
@@ Line 23: / Line 19: @@
 ===Returns===
-Returns a table of '''iSamples'''/2 (or '''iBands'''-1 if '''iBands''' is used) floats representing the current audio frame.
+Returns a table of '''iSamples'''/2 (or '''iBands''' if '''iBands''' is used) ''floats'' representing the current audio frame.
-Returns false if the sound is not playing yet or hasn't buffered in the
+Returns ''false'' if the sound is not playing yet or hasn't buffered in the
 case of streams.
@@ Line 34: / Line 30: @@
 function onSoundPlayRender ( )
      if ( soundHandler ) then
-         local soundFFT = getSoundFFTData ( soundHandler, 2048, 257 )
+         local soundFFT = getSoundFFTData ( soundHandler, 2048, 256 )
 	if ( soundFFT ) then
-             for i = 0, 255 do
+             for i = 0, 255 do -- Data starts from index 0
-                 dxDrawRectangle ( 0, i, 1, math.sqrt ( soundFFT[i] ) * 256 )
+                 dxDrawRectangle ( i, 0, 1, math.sqrt ( soundFFT[i] ) * 256 )
              end
          end
@@ Line 52: / Line 48: @@
 ==See Also==
 {{Client_audio_functions}}
+[[HU:getSoundFFTData]]
 [[ES:getSoundFFTData]]
 [[AR:getSoundFFTData]]
+[[PT-BR:getSoundFFTData]]