Examples of low level control (synthesis) of audio ? - speakers, HDMI audio

[Zoadian]

On Thursday, 22 August 2024 at 16:56:05 UTC, Stephen Tashiro 
wrote:
> Are there good explanations or examples of code for low level 
> control of audio in Dlang?
>
> I assume that all high level audio synthesis programs (music, 
> speech synthesis, etc.) rely on some common method of outputing 
> sound.  I also assume the output to analog speakers must be 
> different code than output over HDMI.  Is that correct?
>
> I visualize the final output as data that stores a waveform as 
> a sequence of values that represent amplitudes.  Is that low 
> level of representation necessary? - or do modern speakers and 
> audio devices have built-in programs that accept more concise 
> formats?

There are many ways to output audio. this is what i use: 
https://www.portaudio.com/

and yes, audio is just 2 channels (left+right) of amplitudes. the 
number of values per time depends on the samplerate of the audio 
device.