How to use drmp3 to convert an entire mp3 file to a wav file (source code sample)?

[ghotik]

If you wonder what could be the usage of this functionality, here is why:
I am the developer of the DxWnd program (see on SourceForge) that struggle to revive old programs and add functionalities when possible.
Some user asked for a space-saving feature where all game .wav files are replaced by .mp3 files and converted on the fly. Since the legacy game uses winmm mmio system library calls, it would expect a well-formed .wav file anyway, so the idea is to put a quick conversion from .mp3 to .wav in the mmioOpen wrappers.
I would need a function call like this: Mp3toWav(char *mp3path, HANDLE wavHandle) where wavHandle should be a file handle of a temporary file with FILE_FLAG_DELETE_ON_CLOSE file option to remove it as soon as it is closed.
It seems that what I need could be a modification of the drmp3_open_file_and_read_pcm_frames_f32() function, maybe taking care to add a .wav file header at the end of the operation and using the opportune callbacks to read from and write to the files, but I would prefer to ask your wise advice and, if possible, a code sample.
In case you are interested, here is the DxWnd discussion about it: https://sourceforge.net/p/dxwnd/discussion/general/thread/ba69562df1/#74d3

[mackron]

There's nothing in dr_mp3 specifically to do that, but dr_wav has an encoder that you could use to create the WAV file (though you could also easily just do the WAV encoding yourself - it's very simple). The process is simply decode from dr_mp3, then encode those samples with dr_wav. Once the encoding to WAV is done just load your temporary file like normal. Example usage for the WAV encoder: https://github.com/mackron/dr_libs/blob/master/tests/wav/wav_encoding.c

I have no interest in supporting anything WAV related in dr_mp3. That's what dr_wav is for.