Create audio item and file

[Cedrik0s]

Hi there.

I have seen have to create a PCM_source from a file, access samples etc...
(using Python on Windows)

I was wondering if I can do the other way around: can I create an item programmatically, directly giving it a buffer of audio samples, and use Reaper to make this into a wav file?

Thanks,
Cheers

[Xenakios]

I think you are asking about either of these things :

1) Create a PCM_sink in order to write audio files. (PCM_sink is Reaper's object type for writing audio files.)

or

2) Create a custom PCM_source that generates audio programmatically and would be used as an audio source for a media item take.

These can't currently be done with ReaScript. They can be achieved with C++ extension plugins, though.

[Meo-Ada Mespotine]

Would it be possible and somehow useable to expose them to ReaScript?
Or is ReaScript not suitable for usage of them?

[Xenakios]

Originally Posted by mespotine

Would it be possible and somehow useable to expose them to ReaScript?
Or is ReaScript not suitable for usage of them?

Exposing the PCM_sinks should be fairly easily possible.

Allowing ReaScripts to implement custom PCM_sources is trickier because Lua and Python are not real time safe. (Heap allocations, garbage collection...) That said, Reaper does have media source buffering so maybe it would work well enough most of the time anyway.

Eel ReaScript might not have the dynamic memory and garbage collection problem, but I wouldn't personally like a scripting feature that is only available from Eel code.

[Cedrik0s]

Sorry for my delayed answer.
Thanks guys for your answers.

Originally Posted by Xenakios

I think you are asking about either of these things :

1) Create a PCM_sink in order to write audio files. (PCM_sink is Reaper's object type for writing audio files.)

or

2) Create a custom PCM_source that generates audio programmatically and would be used as an audio source for a media item take.

These can't currently be done with ReaScript. They can be achieved with C++ extension plugins, though.

I see. It's a pity. It would have been handy to generate some file programmatically at times.

I guess I'll have a look at the C++ extension plugins some time.

Thanks,
Cheers

[Xenakios]

Originally Posted by Cedrik0s

I guess I'll have a look at the C++ extension plugins some time.

I have added support for writing WAV audio files with ReaScript into Julian Sander's extension plugin. https://forum.cockos.com/showthread.php?t=212174

However, the current binaries of the extension have a bug I've just hopefully fixed, so you should wait until Julian has accepted my fix and the new binaries have been built and uploaded.

Implementing support for custom PCM_sources implemented in ReaScript code is not currently possible I think...

[Cedrik0s]

Originally Posted by Xenakios

I have added support for writing WAV audio files with ReaScript into Julian Sander's extension plugin. https://forum.cockos.com/showthread.php?t=212174

However, the current binaries of the extension have a bug I've just hopefully fixed, so you should wait until Julian has accepted my fix and the new binaries have been built and uploaded.

Implementing support for custom PCM_sources implemented in ReaScript code is not currently possible I think...

Very interesting!
I'll check that extension. Thanks a lot!
(at the moment I am only interested in sinks anyway, not in sources)

Cheers