Add Dart API for Kokoro TTS 1.0 (#1806)

dart-api-examples/tts/run-kokoro-zh-en.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+
+set -ex
+
+dart pub get
+
+# please visit
+# https://k2-fsa.github.io/sherpa/onnx/tts/pretrained_models/kokoro.html
+# to download more models
+if [ ! -f ./kokoro-multi-lang-v1_0/model.onnx ]; then
+  curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/kokoro-multi-lang-v1_0.tar.bz2
+  tar xf kokoro-multi-lang-v1_0.tar.bz2
+  rm kokoro-multi-lang-v1_0.tar.bz2
+fi
+
+dart run \
+  ./bin/kokoro-zh-en.dart \
+  --model ./kokoro-multi-lang-v1_0/model.onnx \
+  --voices ./kokoro-multi-lang-v1_0/voices.bin \
+  --tokens ./kokoro-multi-lang-v1_0/tokens.txt \
+  --data-dir ./kokoro-multi-lang-v1_0/espeak-ng-data \
+  --dict-dir ./kokoro-multi-lang-v1_0/dict \
+  --lexicon ./kokoro-multi-lang-v1_0/lexicon-us-en.txt,./kokoro-multi-lang-v1_0/lexicon-zh.txt \
+  --sid 45 \
+  --speed 1.0 \
+  --output-wav kokoro-zh-en-45.wav \
+  --text "中英文语音合成测试。This is generated by next generation Kaldi using Kokoro without Misaki. 你觉得中英文说的如何呢？"
+
+ls -lh *.wav