Add experimental AudioRecorder plugin

[lupenox]

This PR introduces a new AudioRecorder tool plugin for LMMS.

Captures audio from the system microphone (via ALSA on Linux).
Streams data into a background worker thread.
Saves recordings to .wav format using libsndfile.
Simple UI with Record / Stop buttons.

Currently, this is an experimental implementation:

Works on Linux with ALSA.
Recording starts and stops successfully, and .wav files are saved.
UI is functional but minimal (needs polish).
Output path handling can be improved (currently defaults to $HOME/Music/LMMS Recordings).

[szeli1]

Suggested change

	"Your Name <[email protected]>",
	"Your Name <[email protected]>",

Missing

[szeli1]

Hello, #7786 exists. As far as I can tell, this tool isn't really integrated with lmms.
Here are the problems I see:

1. ALSA, lmms already has classes that interface with alsa and many other audio APIs
2. It doesn't use the lmms libsndfile code
3. It doesn't save to a sample track or to any location in the application.
4. .waw with 1 channel, you could use a better audio format

I'm not the one who will decide what will happen to this PR, but for the reasons I mentioned above, It is unlikely it will be merged before #7786. Unfortunately #7786 also competes with this PR.

[lupenox]

Hello, #7786 exists. As far as I can tell, this tool isn't really integrated with lmms. Here are the problems I see:

1. ALSA, lmms already has classes that interface with alsa and many other audio APIs
2. It doesn't use the lmms libsndfile code
3. It doesn't save to a sample track or to any location in the application.
4. .waw with 1 channel, you could use a better audio format

I'm not the one who will decide what will happen to this PR, but for the reasons I mentioned above, It is unlikely it will be merged before #7786. Unfortunately #7786 also competes with this PR.

Hi, thanks a lot for taking the time to review this and for laying out the architectural issues so clearly. I really appreciate the detailed explanation.

This plugin started as a small experimental prototype to explore live audio capture inside LMMS, so I completely understand that it doesn’t follow the LMMS audio architecture yet. Your points about using the existing LMMS audio interfaces, libsndfile, and proper sample/track integration all make sense.

I’ll take a closer look at #7786 and the LMMS audio APIs to get a better understanding of the correct approach. I’m not sure yet how much time I’ll have to fully rewrite it, but this feedback gives me a much clearer direction if I decide to iterate on it.

Thanks again, the review was genuinely helpful.