Function AudioFileSetUserData 

pub unsafe extern "C-unwind" fn AudioFileSetUserData(
    in_audio_file: AudioFileID,
    in_user_data_id: u32,
    in_index: u32,
    in_user_data_size: u32,
    in_user_data: NonNull<c_void>,
) -> i32

Available on crate feature AudioFile only.

Set the data of a chunk in a file.

Parameter inAudioFile: an AudioFileID.

Parameter inUserDataID: the four char code of the chunk.

Parameter inIndex: an index specifying which chunk if there are more than one.

Parameter inUserDataSize: on input the size of the data to copy, on output, size of bytes copied from the buffer

Parameter inUserData: a pointer to a buffer from which to copy the chunk data (only the contents of the chunk, not including the chunk header).

Returns: returns noErr if successful.