GetSoundWaveData: Difference between revisions

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(There was a problem where waveData could be false and "if (waveData[i] == waveData[i]) then" giving error, because script can't index a boolean value)
(One intermediate revision by one other user not shown)
Line 42: Line 42:
<syntaxhighlight lang="lua">
<syntaxhighlight lang="lua">
soundHandler = playSound ("audio.mp3")
soundHandler = playSound ("audio.mp3")
local samples = 256


function renderWave ()
function renderWave ()
     if (isElement (soundHandler)) then
     if (isElement (soundHandler)) then
         waveData = getSoundWaveData (soundHandler, samples)
         local waveData = getSoundWaveData (soundHandler, samples)
         for i=0, samples-1 do
         for i=0, samples-1 do
             if (waveData[i] == waveData[i]) then -- Avoid NaN values.
             if (waveData) then -- Avoid NaN values.
                 dxDrawRectangle (i, 128, 1, math.abs (waveData[i]) * 128)
                 dxDrawRectangle (i, 128, 1, math.abs (waveData[i]) * 128)
             end
             end
Line 60: Line 61:
<syntaxhighlight lang="lua">
<syntaxhighlight lang="lua">
soundHandler = playSound ("audio.mp3")
soundHandler = playSound ("audio.mp3")
local samples = 256


function renderWave ()
function renderWave ()
     if (isElement (soundHandler)) then
     if (isElement (soundHandler)) then
         waveData = getSoundWaveData (soundHandler, samples)
         local waveData = getSoundWaveData (soundHandler, samples)
         for i=0, samples-1 do
         for i=0, samples-1 do
             if (waveData[i] == waveData[i]) then -- Avoid NaN values.
             if (waveData) then -- Avoid NaN values.
                 dxDrawRectangle (i, 128, 1, math.abs (waveData[i]) * -128)
                 dxDrawRectangle (i, 128, 1, math.abs (waveData[i]) * -128)
            end
        end
    end
end
addEventHandler ("onClientRender", root, renderWave)
</syntaxhighlight>
</section>
This example creates a sound viewer on the bottom right corner of the screen.
<section name="Client" class="client" show="true">
<syntaxhighlight lang="lua">
soundHandler = playSound ("audio.mp3")
local x, y = guiGetScreenSize ()
local samples = 256
function renderWave ()
    if (isElement (soundHandler)) then
        local waveData = getSoundWaveData (soundHandler, samples)
        for i=0, samples-1 do
            if (waveData) then -- Avoid NaN values.
                dxDrawRectangle ((x-samples)+i, y-128, 1, waveData[i] * 128)
             end
             end
         end
         end

Revision as of 01:44, 12 April 2020

This function gets the wave form data for an audio stream which is a table of floats representing the current audio frame as a wave. This allows things like visualisations.

If the element is a player, this function will use the players voice.

Syntax

table getSoundWaveData ( element sound, int iSamples )

OOP Syntax Help! I don't understand this!

Method: sound:getWaveData(...)


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.

Returns

Returns a table of iSamples floats representing the current audio frame waveform. Returns false if the sound is not playing yet or hasn't buffered in the case of streams.

Example

This example creates a sound visualizer on the top left corner of the screen.

Click to collapse [-]
Client
soundHandler = playSound ( "sound.wav" )

function onSoundPlayRender ( )
    if ( soundHandler ) then
        local waveData = getSoundWaveData ( soundHandler, 256 )
	if ( waveData ) then
            for i=0,255 do
                dxDrawRectangle ( i, 128, 1, waveData[i] * 128)
            end
        end
    end
end
addEventHandler ( "onClientRender", getRootElement(), onSoundPlayRender )

This example creates a sound viewer, but only with bars down.

Click to collapse [-]
Client
soundHandler = playSound ("audio.mp3")
local samples = 256

function renderWave ()
    if (isElement (soundHandler)) then
        local waveData = getSoundWaveData (soundHandler, samples)
        for i=0, samples-1 do
            if (waveData) then -- Avoid NaN values.
                dxDrawRectangle (i, 128, 1, math.abs (waveData[i]) * 128)
            end
        end
    end
end
addEventHandler ("onClientRender", root, renderWave)

This example creates a sound viewer, but only with bars up.

Click to collapse [-]
Client
soundHandler = playSound ("audio.mp3")
local samples = 256

function renderWave ()
    if (isElement (soundHandler)) then
        local waveData = getSoundWaveData (soundHandler, samples)
        for i=0, samples-1 do
            if (waveData) then -- Avoid NaN values.
                dxDrawRectangle (i, 128, 1, math.abs (waveData[i]) * -128)
            end
        end
    end
end
addEventHandler ("onClientRender", root, renderWave)

This example creates a sound viewer on the bottom right corner of the screen.

Click to collapse [-]
Client
soundHandler = playSound ("audio.mp3")
local x, y = guiGetScreenSize ()
local samples = 256

function renderWave ()
    if (isElement (soundHandler)) then
        local waveData = getSoundWaveData (soundHandler, samples)
        for i=0, samples-1 do
            if (waveData) then -- Avoid NaN values.
                dxDrawRectangle ((x-samples)+i, y-128, 1, waveData[i] * 128)
            end
        end
    end
end
addEventHandler ("onClientRender", root, renderWave)

Changelog

Version Description
1.3.2 Added player element to use a players voice

See Also