What happen in DAW when plugin starts


#1

hello,  i am having test about daw & vst plugin

i study wav file, and vst plugin

so i think this wav file is composed of 16bit integer pcm (-32768 ~ 32767)

but when making vst plugin , the function (processblock) has float values.

(32bit float single precision)

i read the vst plugin page, they(steinberg) decide to use 32 float single precision(-1.0 ~ 1.0)

so do DAW change 16bit int to 32float?

if i use another daw such as reaper, login, cubase, do i have same 32 float values??

 

 


#2

yes, all processing is done in float values these days, except if the host called setProcessingPrecision (ProcessingPrecision precision), then it uses doubles i.e. 64 bit flaoting point, see: http://www.juce.com/doc/classAudioProcessor#ab9c8a901838ee7d35df06d849a1709a2

You can see in the example plugin a nice way, how you can template your processing for FloatType, so you don't have to code float and double variants separately: https://github.com/julianstorer/JUCE/blob/master/examples/audio%20plugin%20demo/Source/PluginProcessor.h

Especially lines 34-44


#3

Yes, whenever you are in the context of DAWs, audio plug-ins, and JUCE apps, your audio will be represented as 32-bit floats with the valid values being in the range [-1.0, 1.0], regardless of what other formats are used elsewhere in your system.