an efficient way to save audio recording to files?

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an efficient way to save audio recording to files?

feima0011

I wish to record the microphone measurement using the audio read for 10 seconds.
And then save the audio read to a file.
Is there any efficient way to do it?

Currently I use file.log to save the file in the render function. but this is very inefficient.

Can I run the render function for only a limited time, such as 10 seconds.
and then save the audio read in the cleanup function.

It would be nice to have Bela examples for data file read and write.

giuliomoro

Someone recently emailed with a similar enquiry. My response was:

You can write the output to an audio file. For a short recording it's as simple as this:
- preallocate a std::vector<float> of the desired size (e.g.: context->audioSampleRate * 60 will give you one minute of mono recording)
- write to the vector each value you want to write to disk
- include the AudioFile library
- use the AudioFileUtilities::write() function to write to disk from within the cleanup() function
This approach is fine for short recordings (as long as the amount of memory needed by the vector is below let's say 100MB), but if that becomes higher then you will not be able to store the whole data in memory and write from cleanup() and you will need to write to disk from a separate thread while the program is running.

I finally put that into practice, here's a full example:

https://github.com/BelaPlatform/Bela/blob/dev/examples/Audio/record-to-file/render.cpp