Phonetables: Use "length" field in Tone phonemes to adjust the lengths of the vowel.

git-svn-id: https://espeak.svn.sourceforge.net/svnroot/espeak/trunk@206 d46cf337-b52f-0410-862d-fd96e6ae7743

src/setlengths.cpp

@@ -278,6 +278,7 @@ void Translator::CalcLengths()
 	int  embedded_ix = 0;
 	int  min_drop;
 	int emphasized;
+	int  tone_mod;
 	unsigned char *pitch_env=NULL;
 
 	for(ix=1; ix<n_phoneme_list; ix++)
@@ -550,6 +551,15 @@ void Translator::CalcLengths()
 
 			length_mod = (length_mod * len)/128;
 
+			if(p->tone_ph != 0)
+			{
+				if((tone_mod = phoneme_tab[p->tone_ph]->std_length) > 0)
+				{
+					// a tone phoneme specifies a percentage change to the length
+					length_mod = (length_mod * tone_mod) / 100;
+				}
+			}
+
 			if(end_of_clause == 2)
 			{
 				// this is the last syllable in the clause, lengthen it - more for short vowels