Re: Creating a software video device in modern APIs

[Rick Mann via Cocoa-dev]

I should be a little more clear. I want to take my generated video and output 
it in such a way that any other app, that can take video (and audio) input from 
a camera, can take it from my app instead. So, some kind of software video & 
audio device.

> On Mar 17, 2020, at 22:25 , Rick Mann via Cocoa-dev 
>  wrote:
> 
> I want to make something like a live video mixing/compositing app for macOS. 
> Does anyone know what I should be looking at in the wide array of video APIs 
> to do this?
> 
> Thanks.
> 
> -- 
> Rick Mann
> rm...@latencyzero.com
> 
> 
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-- 
Rick Mann
rm...@latencyzero.com


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Creating a software video device in modern APIs

[Rick Mann via Cocoa-dev]

I want to make something like a live video mixing/compositing app for macOS. 
Does anyone know what I should be looking at in the wide array of video APIs to 
do this?

Thanks.

-- 
Rick Mann
rm...@latencyzero.com


___

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Re: Thunderbolt port audio programmability

[Jens Alfke via Cocoa-dev]

If you want to make more than sine waves, there are a bunch of open source 
audio libraries/programs for generating arbitrarily fancy waveforms — CSound, 
Pure Data, Max, Supercollider... These are usually used for music synthesis, 
but most of them let you do general purpose DSP type stuff. And of course they 
handle the audio output too.

https://en.wikipedia.org/wiki/Comparison_of_audio_synthesis_environments 


—Jens
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Re: Thunderbolt port audio programmability

[Daniel Waylonis via Cocoa-dev]

I think AVFoundation is probably the easiest way to get started.

There’s a pretty good sample on how to do it:

https://developer.apple.com/documentation/avfoundation/audio_track_engineering/building_a_signal_generator
 


Dan
-
Dan Waylonis | nekotech.com
650.887.3711



> On Mar 13, 2020, at 3:51 PM, Jens Alfke via Cocoa-dev 
>  wrote:
> 
> 
> 
>> On Mar 12, 2020, at 5:31 PM, Carl Hoefs  
>> wrote:
>> 
>> In iOS, what is the current way to generate precise audio tones? 
>> AVFoundation? CoreAudio? AudioUnits?
> 
> AudioUnits. It's been a long time since I worked with that API, but I'm 
> pretty sure I recall some sample code showing a generator AU that emits a 
> sine wave.
> 
> —Jens
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