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;;;                Centre for Speech Technology Research                  ;;
;;;                     University of Edinburgh, UK                       ;;
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;;;
;;;  Support for MBROLA as an external module.
;;;

;;; You might want to set this in your sitevars.scm
(defvar mbrola_progname "/cstr/external/mbrola/mbrola"
  "mbrola_progname
  The program name for mbrola.")
(defvar mbrola_database "fr1"
  "mbrola_database
 The name of the MBROLA database to usde during MBROLA Synthesis.")

(define (MBROLA_Synth utt)
  "(MBROLA_Synth UTT)
  Synthesize using MBROLA as external module.  Basically dump the info
  from this utterance. Call MBROLA and reload the waveform into utt.
  [see MBROLA]"
  (let ((filename (make_tmp_filename)))
    (save_segments_mbrola utt filename)
    (system (string-append mbrola_progname " " 
			   mbrola_database " "
			   filename " "
			   filename ".au"))
    (utt.import.wave utt (string-append filename ".au"))
    (apply_hooks after_synth_hooks utt)
    (delete-file filename)
    (delete-file (string-append filename ".au"))
    utt))

(define (save_segments_mbrola utt filename)
  "(save_segments_mbrola UTT FILENAME)
  Save segment information in MBROLA format in filename.  The format is
  phone duration (ms) [% position F0 target]*. [see MBROLA]"
  (let ((fd (fopen filename "w")))
    (mapcar
     (lambda (segment) 
       (save_seg_mbrola_entry 
	(item.feat segment 'name)
	(item.feat segment 'segment_start)
	(item.feat segment 'segment_duration)
	(mapcar
	 (lambda (targ_item)
	   (list
	    (item.feat targ_item "pos")
	    (item.feat targ_item "f0")))
	 (item.relation.daughters segment 'Target)) ;; list of targets
	fd))
     (utt.relation.items utt 'Segment))
    (fclose fd)))

(define (save_seg_mbrola_entry name start dur targs fd)
  "(save_seg_mbrola_entry ENTRY NAME START DUR TARGS FD)
  Entry contains, (name duration num_targs start 1st_targ_pos 1st_targ_val)."
  (format fd "%s %d " name (nint (* dur 1000)))
  (if targs     ;; if there are any targets
      (mapcar
       (lambda (targ) ;; targ_pos and targ_val
	 (let ((targ_pos (car targ))
	       (targ_val (car (cdr targ))))
	                                  
	   (format fd "%d %d " 
		   (nint (* 100 (/ (- targ_pos start) dur))) ;; % pos of target
		   (nint (parse-number targ_val)))           ;; target value
	   ))
       targs))
  (terpri fd)
  (terpri fd)
)
	
(provide 'mbrola)
