tts : text pre-processing

examples/tts/tts.cpp

@@ -7,12 +7,14 @@
 #define _USE_MATH_DEFINES // For M_PI on MSVC
 
 #include <algorithm>
-#include <cstdio>
 #include <cmath>
-#include <string>
-#include <vector>
+#include <cstdio>
 #include <fstream>
+#include <map>
+#include <regex>
+#include <string>
 #include <thread>
+#include <vector>
 
 //
 // Terminal utils
@@ -267,6 +269,143 @@ static std::vector<double> embd_to_audio(
     return audio;
 }
 
+static const std::map<int, std::string> ones = {
+    {0, "zero"}, {1, "one"}, {2, "two"}, {3, "three"}, {4, "four"},
+    {5, "five"}, {6, "six"}, {7, "seven"}, {8, "eight"}, {9, "nine"},
+    {10, "ten"}, {11, "eleven"}, {12, "twelve"}, {13, "thirteen"}, {14, "fourteen"},
+    {15, "fifteen"}, {16, "sixteen"}, {17, "seventeen"}, {18, "eighteen"}, {19, "nineteen"}
+};
+
+static const std::map<int, std::string> tens = {
+    {2, "twenty"}, {3, "thirty"}, {4, "forty"}, {5, "fifty"},
+    {6, "sixty"}, {7, "seventy"}, {8, "eighty"}, {9, "ninety"}
+};
+
+// Convert a number less than 1000 to words
+static std::string convert_less_than_thousand(int num) {
+    std::string result;
+
+    if (num >= 100) {
+        result += ones.at(num / 100) + " hundred ";
+        num %= 100;
+    }
+
+    if (num >= 20) {
+        result += tens.at(num / 10);
+        if (num % 10 > 0) {
+            result += "-" + ones.at(num % 10);
+        }
+    } else if (num > 0) {
+        result += ones.at(num);
+    }
+
+    return result;
+}
+
+static std::string number_to_words(const std::string & number_str) {
+    try {
+        size_t decimal_pos = number_str.find('.');
+        std::string integer_part = number_str.substr(0, decimal_pos);
+
+        int int_number = std::stoi(integer_part);
+        std::string result;
+
+        if (int_number == 0) {
+            result = "zero";
+        } else {
+            if (int_number >= 1000000000) {
+                int billions = int_number / 1000000000;
+                result += convert_less_than_thousand(billions) + " billion ";
+                int_number %= 1000000000;
+            }
+
+            if (int_number >= 1000000) {
+                int millions = int_number / 1000000;
+                result += convert_less_than_thousand(millions) + " million ";
+                int_number %= 1000000;
+            }
+
+            if (int_number >= 1000) {
+                int thousands = int_number / 1000;
+                result += convert_less_than_thousand(thousands) + " thousand ";
+                int_number %= 1000;
+            }
+
+            if (int_number > 0) {
+                result += convert_less_than_thousand(int_number);
+            }
+        }
+
+        // Handle decimal part
+        if (decimal_pos != std::string::npos) {
+            result += " point";
+            std::string decimal_part = number_str.substr(decimal_pos + 1);
+            for (char digit : decimal_part) {
+                result += " " + ones.at(digit - '0');
+            }
+        }
+
+        return result;
+    } catch (const std::exception& e) {
+        // Skip if fails
+        return " ";
+    }
+}
+
+static std::string replace_numbers_with_words(const std::string & input_text) {
+    std::regex number_pattern(R"(\d+(\.\d+)?)");
+    std::string result;
+    auto it = std::sregex_iterator(input_text.begin(), input_text.end(), number_pattern);
+    auto end = std::sregex_iterator();
+
+    size_t last_pos = 0;
+    for (std::sregex_iterator i = it; i != end; ++i) {
+        const std::smatch& match = *i;
+        result.append(input_text, last_pos, match.position() - last_pos);
+        result.append(number_to_words(match.str()));
+        last_pos = match.position() + match.length();
+    }
+    result.append(input_text, last_pos);
+
+    return result;
+}
+
+// Based on: https://github.com/edwko/OuteTTS/blob/a613e79c489d8256dd657ea9168d78de75895d82/outetts/version/v1/prompt_processor.py#L39
+static std::string process_text(const std::string & text) {
+
+    // For now I skipped text romanization as I am unsure how to handle
+    // uroman and MeCab implementations in C++
+    // maybe something like https://github.com/anyascii/anyascii/ could work.
+    // currently only English would be supported in this function
+
+    std::string processed_text = replace_numbers_with_words(text);
+
+    std::transform(processed_text.begin(), processed_text.end(),
+                  processed_text.begin(), ::tolower);
+
+    std::regex special_chars(R"([-_/,\.\\])");
+    processed_text = std::regex_replace(processed_text, special_chars, " ");
+
+    std::regex non_alpha(R"([^a-z\s])");
+    processed_text = std::regex_replace(processed_text, non_alpha, "");
+
+    std::regex multiple_spaces(R"(\s+)");
+    processed_text = std::regex_replace(processed_text, multiple_spaces, " ");
+
+    processed_text = std::regex_replace(processed_text, std::regex(R"(^\s+|\s+$)"), "");
+
+    /*
+        Replace spaces with the separator token same as in line 365
+
+        for (auto & c : prompt_user) {
+        if (c == ' ') {
+            prompt_clean += "<|text_sep|>";
+    */
+    processed_text = std::regex_replace(processed_text, std::regex(R"(\s)"), "<|text_sep|>");
+
+    return processed_text;
+}
+
 static void prompt_add(llama_tokens & prompt, llama_token token) {
     prompt.push_back(token);
 }
@@ -353,23 +492,11 @@ int main(int argc, char ** argv) {
 
         prompt_add(prompt_inp, model_ttc, "<|text_start|>the<|text_sep|>overall<|text_sep|>package<|text_sep|>from<|text_sep|>just<|text_sep|>two<|text_sep|>people<|text_sep|>is<|text_sep|>pretty<|text_sep|>remarkable<|text_sep|>sure<|text_sep|>i<|text_sep|>have<|text_sep|>some<|text_sep|>critiques<|text_sep|>about<|text_sep|>some<|text_sep|>of<|text_sep|>the<|text_sep|>gameplay<|text_sep|>aspects<|text_sep|>but<|text_sep|>its<|text_sep|>still<|text_sep|>really<|text_sep|>enjoyable<|text_sep|>and<|text_sep|>it<|text_sep|>looks<|text_sep|>lovely<|text_sep|>", false, true);
 
-        // TODO: not sure if this is correct
+        // convert the input text into the necessary format expected by OuteTTS
         {
-            std::string prompt_clean;
-            std::string prompt_user = params.prompt;
+            std::string prompt_clean = process_text(params.prompt);
 
-            for (auto & c : prompt_user) {
-                if (c == ' ') {
-                    prompt_clean += "<|text_sep|>";
-                } else {
-                    if (isalpha(c) || isdigit(c)) {
-                        c = tolower(c);
-                    } else {
-                        continue;
-                    }
-                    prompt_clean += c;
-                }
-            }
+            LOG_INF("%s: prompt: '%s'\n", __func__, prompt_clean.c_str());
 
             prompt_add(prompt_inp, model_ttc, prompt_clean, false, true);
         }