Add Pascal API for Kokoro TTS models (#1724)

pascal-api-examples/tts/kokoro-en.pas

@@ -0,0 +1,55 @@
+{ Copyright (c)  2025  Xiaomi Corporation }
+program kokoro_en;
+{
+This file shows how to use the text to speech API of sherpa-onnx
+with Kokoro TTS models.
+
+It generates speech from text and saves it to a wave file.
+
+If you want to play it while it is generating, please see
+./kokoro-en-playback.pas
+}
+
+{$mode objfpc}
+
+uses
+  SysUtils,
+  sherpa_onnx;
+
+function GetOfflineTts: TSherpaOnnxOfflineTts;
+var
+  Config: TSherpaOnnxOfflineTtsConfig;
+begin
+  Config.Model.Kokoro.Model := './kokoro-en-v0_19/model.onnx';
+  Config.Model.Kokoro.Voices := './kokoro-en-v0_19/voices.bin';
+  Config.Model.Kokoro.Tokens := './kokoro-en-v0_19/tokens.txt';
+  Config.Model.Kokoro.DataDir := './kokoro-en-v0_19/espeak-ng-data';
+  Config.Model.NumThreads := 2;
+  Config.Model.Debug := False;
+  Config.MaxNumSentences := 1;
+
+  Result := TSherpaOnnxOfflineTts.Create(Config);
+end;
+
+var
+  Tts: TSherpaOnnxOfflineTts;
+  Audio: TSherpaOnnxGeneratedAudio;
+
+  Text: AnsiString;
+  Speed: Single = 1.0;  {Use a larger value to speak faster}
+  SpeakerId: Integer = 8;
+
+begin
+  Tts := GetOfflineTts;
+
+  WriteLn('There are ', Tts.GetNumSpeakers, ' speakers');
+
+  Text := 'Friends fell out often because life was changing so fast. The easiest thing in the world was to lose touch with someone.';
+
+  Audio :=  Tts.Generate(Text, SpeakerId, Speed);
+  SherpaOnnxWriteWave('./kokoro-en-8.wav', Audio.Samples, Audio.SampleRate);
+  WriteLn('Saved to ./kokoro-en-8.wav');
+
+  FreeAndNil(Tts);
+end.
+