Merge pull request stakira#1244 from Cadlaxa/diff-arpa+

Add [DIFFS EN+] Phonemizer

OpenUtau.Core/DiffSinger/Phonemizers/DiffSingerARPAPlusEnglishPhonemizer.cs

@@ -0,0 +1,97 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using OpenUtau.Api;
+using OpenUtau.Core.G2p;
+
+namespace OpenUtau.Core.DiffSinger {
+    [Phonemizer("DiffSinger English+ Phonemizer", "DIFFS EN+", language: "EN", author: "Cadlaxa")]
+    public class DiffSingerARPAPlusEnglishPhonemizer : DiffSingerG2pPhonemizer
+    // cadlaxa here, this diffsinger english phonemizer just uses the ARPA+ G2p so arpasing+ and this phonemizer
+    // have same g2p mechanics such as triggering of glottal stop with ('), manual relaxed consonants
+    // plus other ds features
+    {
+        protected override string GetDictionaryName() => "dsdict-en.yaml";
+        protected override string GetLangCode() => "en";
+        protected override IG2p LoadBaseG2p() => new ArpabetPlusG2p();
+        protected override string[] GetBaseG2pVowels() => new string[] {
+            "aa", "ae", "ah", "ao", "aw", "ax", "ay", "eh", "er",
+            "ey","ih", "iy", "ow", "oy","uh", "uw"
+        };
+        protected override string[] GetBaseG2pConsonants() => new string[] {
+            "b", "ch", "d", "dh", "dr", "dx", "f", "g", "hh", "jh",
+            "k", "l", "m", "n", "ng", "p", "q", "r", "s", "sh", "t",
+            "th", "tr", "v", "w", "y", "z", "zh"
+        };
+        public override Result Process(Note[] notes, Note? prev, Note? next, Note? prevNeighbour, Note? nextNeighbour, Note[] prevs) {
+
+            if (notes[0].lyric == "-") {
+                return MakeSimpleResult("SP");
+            }
+            if (notes[0].lyric == "br") {
+                return MakeSimpleResult("AP");
+            }
+            if (!partResult.TryGetValue(notes[0].position, out var phonemes)) {
+                throw new Exception("Result not found in the part");
+            }
+            var processedPhonemes = new List<Phoneme>();
+
+            for (int i = 0; i < phonemes.Count; i++) {
+                var tu = phonemes[i];
+
+                // Check for "n dx" sequence and replace it with "n"
+                // the actual phoneme for this is "nx" like (winner [w ih nx er])
+                if (i < phonemes.Count - 1 && tu.Item1 == "n" && phonemes[i + 1].Item1 == "dx") {
+                    processedPhonemes.Add(new Phoneme() {
+                        phoneme = "n",
+                        position = tu.Item2
+                    });
+                    // Skip the next phoneme ("dx")
+                    i++;
+                } else if (ShouldReplacePhoneme(tu.Item1, prev, next, prevNeighbour, nextNeighbour, out string replacement)) {
+                    processedPhonemes.Add(new Phoneme() {
+                        phoneme = replacement,
+                        position = tu.Item2
+                    });
+                } else {
+                    processedPhonemes.Add(new Phoneme() {
+                        phoneme = tu.Item1,
+                        position = tu.Item2
+                    });
+                }
+            }
+            return new Result {
+                phonemes = processedPhonemes.ToArray()
+            };
+        }
+
+        // Method to determine if a phoneme should be replaced based on specific conditions
+        private bool ShouldReplacePhoneme(string phoneme, Note? prev, Note? next, Note? prevNeighbour, Note? nextNeighbour, out string replacement) {
+            replacement = phoneme;
+            if (phoneme == "q") {
+                replacement = "cl";
+                return true;
+            }
+            if (phoneme == "q") {
+                // vocal fry the vowel is the prevNeighbour is null
+                if (!prevNeighbour.HasValue || string.IsNullOrWhiteSpace(prevNeighbour.Value.lyric)) {
+                replacement = "vf";
+                return true;
+                }
+            }
+            // automatic relaxed consonants
+            if ((phoneme == "t" || phoneme == "d") && (nextNeighbour.HasValue && IsVowel(nextNeighbour.Value))) {
+                replacement = "dx";
+                return true;
+            }
+            return false;
+        }
+        // Method to check if a phoneme is a vowel
+        private bool IsVowel(Note note) {
+            string[] vowels = GetBaseG2pVowels();
+            return vowels.Contains(note.lyric);
+        }
+    }
+}