looper/backends/playback/sdl_mixer_x/backend.json

{
    "class_name": "SDLMixerXBackend",
    "include_path": "sdl_mixer_x.hpp",
    "mime_types": ["audio/x-wav", "audio/x-flac", "audio/mid", "audio/midi", "audio/ogg", "audio.x-midi", "audio/wav"]
}