Thanks for the link. The DAISY work seems focused on making e-books (that is, those you read on screens) accessible to the blind. Organizing the text to be compatible with screen-readers, linking it with audio, etc.
My quick (admittedly very brief) review of the home page doesn’t seem to indicate anything specifically for audio books which, by their nature, should already be friendly to the blind, since they don’t require vision for access.
Regarding macOS, an audio book is, at its simplest, just an audio file, no different from music files you download or rip from CDs. To make an Apple-friendly audiobook, record/convert your audio to AAC format, then rename the file extension from “.m4a” to “.m4b” before adding it to iTunes (or the Music app). Apple software (at least iTunes) should recognize it as an audio book. It will be grouped with other audio books and players will get the book-related features (e.g. speed control, remembering playback position, etc.) when playing the file.
Most purchased audio books I’ve seen in retail stores seem to be distributed as a collection of MP3 files (for broad device compatibility). There is usually one file per chapter of the book, with a file-name scheme that includes the chapter numbers, so the files will sort in the correct playback order.
All this having been said, if you are providing audio books for the blind (and not just for the general public), you should know about the National Library Service’s BARD system which provides audio transcriptions of books and periodicals free of charge to anybody who qualifies for access.
I don’t know what tools and specifications are required for authoring content for the BARD system, but it sounds like this is something you need to investigate if you haven’t already done so.