FliteEngine - Objective-C speech synthesizer

/*************************************************************************/
/*                                                                       */
/*                  Language Technologies Institute                      */
/*                     Carnegie Mellon University                        */
/*                      Copyright (c) 1999-2000                          */
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/*                                                                       */
/*************************************************************************/
/*             Author:  Alan W Black (awb@cs.cmu.edu)                    */
/*               Date:  December 2000                                    */
/*************************************************************************/
/*                                                                       */
/*  A simple voice defintion                                             */
/*                                                                       */
/*************************************************************************/

#include "flite.h"
#include "cst_diphone.h"
#include "usenglish.h"
#include "cmulex.h"

static cst_utterance *cmu_us_kal_postlex(cst_utterance *u);
extern cst_diphone_db cmu_us_kal_db;

cst_voice *cmu_us_kal_diphone = NULL;

cst_voice *register_cmu_us_kal(const char *voxdir)
{
    cst_voice *v = new_voice();

    /* Set up basic values for synthesizing with this voice */
    usenglish_init(v);
    feat_set_string(v->features,"name","cmu_us_kal_diphone");

    /* Lexicon */
    cmu_lex_init();
    feat_set(v->features,"lexicon",lexicon_val(&cmu_lex));

    /* Intonation */
    feat_set_float(v->features,"int_f0_target_mean",95.0);
    feat_set_float(v->features,"int_f0_target_stddev",11.0);

    feat_set_float(v->features,"duration_stretch",1.1); 

    /* Post lexical rules */
    feat_set(v->features,"postlex_func",uttfunc_val(&cmu_us_kal_postlex));

    /* Waveform synthesis: diphone_synth */
    feat_set(v->features,"wave_synth_func",uttfunc_val(&diphone_synth));
    feat_set(v->features,"diphone_db",diphone_db_val(&cmu_us_kal_db));
    feat_set_int(v->features,"sample_rate",cmu_us_kal_db.sts->sample_rate);
    feat_set_string(v->features,"resynth_type","fixed");
    feat_set_string(v->features,"join_type","modified_lpc");

    cmu_us_kal_diphone = v;

    return cmu_us_kal_diphone;
}

void unregister_cmu_us_kal(cst_voice *v)
{
    if (v != cmu_us_kal_diphone)
	return;
    delete_voice(v);
    cmu_us_kal_diphone = NULL;
}

static void fix_ah(cst_utterance *u)
{
    /* This should really be done in the index itself */
    const cst_item *s;

    for (s=relation_head(utt_relation(u,"Segment")); s; s=item_next(s))
	if (cst_streq(item_feat_string(s,"name"),"ah"))
	    item_set_string(s,"name","aa");
}

static cst_utterance *cmu_us_kal_postlex(cst_utterance *u)
{
    us_postlex(u);
    fix_ah(u);

    return u;
}