/// <summary>
/// Build units for syllbale pronunciation,
/// And the units are concatenated together in the string and seperated by ".".
/// </summary>
/// <param name="phoneme">Phoneme of the language to process with.</param>
/// <param name="sliceData">Slice data to process.</param>
/// <param name="syllable">Syllables to process.</param>
/// <returns>Best unit list.</returns>
public static string[] BuildUnits(Phoneme phoneme,
SliceData sliceData, string syllable)
{
if (phoneme == null)
{
throw new ArgumentNullException("phoneme");
}
if (phoneme.TtsSonorantPhones == null)
{
string message = Helper.NeutralFormat("phoneme.TtsSonorantPhones should not be null.");
throw new ArgumentException(message);
}
if (string.IsNullOrEmpty(syllable))
{
throw new ArgumentNullException("syllable");
}
if (sliceData == null)
{
throw new ArgumentNullException("sliceData");
}
if (sliceData.OnsetSlices == null)
{
string message = Helper.NeutralFormat("sliceData.OnsetSlices should not be null.");
throw new ArgumentException(message);
}
if (sliceData.NucleusSlices == null)
{
string message = Helper.NeutralFormat("sliceData.NucleusSlices should not be null.");
throw new ArgumentException(message);
}
List<string> slicedUnits = new List<string>();
string unstressedSyllable = Pronunciation.RemoveStress(syllable);
ScriptItem scriptItem = new ScriptItem(phoneme.Language);
// items contains phone and tone.
string[] items = scriptItem.PronunciationSeparator.SplitPhones(unstressedSyllable);
// Treate all syllable as one unit at first.
TtsMetaUnit ttsMetaUnit = new TtsMetaUnit(phoneme.Language);
ttsMetaUnit.Name = string.Join(" ", items);
string[] phones = ttsMetaUnit.GetPhonesName();
// Treat all phones in this syllable as a whole unit
if (sliceData.NucleusSlices.IndexOf(ttsMetaUnit.Name) >= 0)
{
// If it is alread defined in the predefined unit collection, return it
slicedUnits.Add(TtsUnit.NucleusPrefix + ttsMetaUnit.Name.Replace(" ", TtsUnit.PhoneDelimiter));
return slicedUnits.ToArray();
}
int vowelIndex = phoneme.GetFirstVowelIndex(phones);
if (vowelIndex < 0)
{
// If no vowel in the syllable, treat all phones in this syllable as a unit if it is in unit table
if (sliceData.OnsetSlices.IndexOf(ttsMetaUnit.Name) >= 0)
{
slicedUnits.Add(TtsUnit.OnsetPrefix + ttsMetaUnit.Name.Replace(" ", TtsUnit.PhoneDelimiter));
}
else if (sliceData.CodaSlices.IndexOf(ttsMetaUnit.Name) >= 0)
{
slicedUnits.Add(TtsUnit.CodaPrefix + ttsMetaUnit.Name.Replace(" ", TtsUnit.PhoneDelimiter));
}
else
{
// otherwise, treat each phone as a coda unit
foreach (string phone in phones)
{
slicedUnits.Add(TtsUnit.CodaPrefix + phone);
}
}
return slicedUnits.ToArray();
}
// Search first cosonant sonarant from the left side of the vowel font in the syllable
int firstSonarantIndex = vowelIndex;
for (int i = vowelIndex - 1; i >= 0; i--)
{
if (phoneme.TtsSonorantPhones.IndexOf(phones[i]) >= 0)
{
firstSonarantIndex = i;
}
}
// Search last cosonant sonarant from the right side of the vowel font in the syllable
int lastSonarantIndex = vowelIndex;
for (int i = vowelIndex + 1; i <= phones.Length - 1; i++)
{
if (phoneme.TtsSonorantPhones.IndexOf(phones[i]) >= 0)
{
lastSonarantIndex = i;
}
}
// Treat all vowel and surrounding sonarant consonants as the nucleus unit first
string nucleus = TtsMetaPhone.Join(" ", ttsMetaUnit.Phones,
firstSonarantIndex, lastSonarantIndex - firstSonarantIndex + 1);
TruncateRuleData truncateRuleData = Localor.GetTruncateRuleData(phoneme.Language);
// Refine nucleus according to the predefined unit table
while (lastSonarantIndex - firstSonarantIndex > 0 && sliceData.NucleusSlices.IndexOf(nucleus) <= 0)
{
// If the unit candidate is not listed in the predefined unit list, try to truncate it
string[] leftRight =
PhoneMerger.TruncateOnePhoneFromNucleus(phoneme, truncateRuleData.NucleusTruncateRules,
nucleus);
if (phoneme.TtsPhones.IndexOf(leftRight[0]) >= 0)
{
Debug.Assert(phoneme.TtsPhones.IndexOf(leftRight[0]) >= 0);
firstSonarantIndex++;
}
else
{
Debug.Assert(phoneme.TtsPhones.IndexOf(leftRight[1]) >= 0);
lastSonarantIndex--;
}
// Re-define the remaining nucleus unit
nucleus = TtsMetaPhone.Join(" ", ttsMetaUnit.Phones,
firstSonarantIndex, lastSonarantIndex - firstSonarantIndex + 1);
}
slicedUnits.Add(TtsUnit.NucleusPrefix + nucleus.Replace(" ", TtsUnit.PhoneDelimiter));
// Refine onset
for (int index = firstSonarantIndex - 1; index >= 0; index--)
{
string onset = TtsMetaPhone.Join(TtsUnit.PhoneDelimiter, ttsMetaUnit.Phones, 0, index + 1);
if (sliceData.OnsetSlices.IndexOf(onset.Replace(TtsUnit.PhoneDelimiter, " ")) >= 0)
{
slicedUnits.Insert(0, TtsUnit.OnsetPrefix + onset);
// Remove the number of added phones,
// except current phone itself which will be recuded by index--
index -= index;
}
else
{
// Treat it as a single phone unit
slicedUnits.Insert(0,
TtsUnit.OnsetPrefix + TtsMetaPhone.Join(TtsUnit.PhoneDelimiter, ttsMetaUnit.Phones, index, 1));
}
}
// Refine coda, matching from right to left
BuildCodaUnits(sliceData, ttsMetaUnit.Phones, lastSonarantIndex + 1, slicedUnits);
return slicedUnits.ToArray();
}
/// <summary>
/// Set nucleus vowel stress mark.
/// </summary>
/// <param name="phoneme">Phoneme of the language to process.</param>
/// <param name="pronunciation">Pronunciation to set pronunciation.</param>
/// <param name="stress">Stress mark to set for the vowel in the pronunciation.</param>
/// <returns>Pronunciation with stress.</returns>
public static string SetVowelStress(Phoneme phoneme, string pronunciation, TtsStress stress)
{
if (phoneme == null)
{
throw new ArgumentNullException("phoneme");
}
if (string.IsNullOrEmpty(pronunciation))
{
return null;
}
if (stress > TtsStress.None)
{
string[] phones = pronunciation.Split(new char[] { ' ' },
StringSplitOptions.RemoveEmptyEntries);
int vowelIndex = phoneme.GetFirstVowelIndex(phones);
if (vowelIndex < 0)
{
string message = string.Format(CultureInfo.InvariantCulture,
"There is no vowel found in the syllable pronunciation [{0}]",
phones);
throw new InvalidDataException(message);
}
phones[vowelIndex] = string.Format(CultureInfo.InvariantCulture,
"{0} {1}", phones[vowelIndex], (int)stress);
return string.Join(" ", phones);
}
else
{
return pronunciation;
}
}
