It's Playstation 4-bit adpcm.
U can convert .int to wav with adpcm_player or cubemediaplayer interleave 10(16).
Or add GENH header with VGMToolbox and play/convert with in_vgmstream plugin for winamp or foobar
.bd it's also Playstation 4-bit Adpcm. U can convert with Psound or split with VGMToolbox(Sony Adpcm Extractor) and add GENH(mono).
For converting wav to Playstation 4-bit adpcm U need to MFaudio(for example).
Settings(channels,frequence,interleave) must be like in original files, size must be the same or smaller.
Thanks, I used the Cubemediaplayer and the Mfaudio with the settings you said to convert.
Thank you very much.