I'm looking to find a converter (ie text-to-speech engine or interface/overlay that will call a user specified text-to-speech engine) that will convert my EBooks into AudioBooks:

• Must: Support at least html, pdf (textual), mobi and azw as input types (more supported is great of course)
• Must: Output in (user choosable) flac, wav or mp3
• Should: read metadata saved in OPF format (ie from Calibre) and save that as metadata on the audio file
• Should: save output side-by-side with input file
• Cool: allow user to pass what speech engine (and speech engine parameters) to use to the cmd line (or gui)
• Windows preferred but *nix acceptable

Must either

• Be/have a Calibre plugin

OR

• Support being given a folder and recursively going through the folder looking for input files.

I'm looking to find a converter (ie text-to-speech engine or interface/overlay that will call a user specified text-to-speech engine) that will convert my EBooks into AudioBooks:

• Must: Support at least html, pdf (textual), mobi and azw as input types (more supported is great of course)
• Must: Output in (user choosable) flac, wav or mp3
• Should: read metadata saved in OPF format (ie from Calibre) and save that as metadata on the audio file
• Should: save output side-by-side with input file
• OS: Windows preferred but *nix acceptable
• Pricing: Gratis would be great but I'm interested in any options as long as they at least have a limited trial edition
• Cool: allow user to pass what speech engine (and speech engine parameters) to use to the cmd line (or gui)
• Cool: Open Source so I can play with it and customize it to the max

Must either

• Be/have a Calibre plugin

OR

• Support being given a folder and recursively going through the folder looking for input files.