Add Go implementation of the TTS generation callback (#2213)

go-api-examples/offline-tts-play/run-matcha-en.sh

@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+
+set -ex
+
+# please visit
+# https://k2-fsa.github.io/sherpa/onnx/tts/pretrained_models/matcha.html#matcha-icefall-en-us-ljspeech-american-english-1-female-speaker
+# matcha.html#matcha-icefall-en-us-ljspeech-american-english-1-female-speaker
+# to download more models
+if [ ! -f ./matcha-icefall-en_US-ljspeech/model-steps-3.onnx ]; then
+  curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/matcha-icefall-en_US-ljspeech.tar.bz2
+  tar xf matcha-icefall-en_US-ljspeech.tar.bz2
+  rm matcha-icefall-en_US-ljspeech.tar.bz2
+fi
+
+if [ ! -f ./vocos-22khz-univ.onnx ]; then
+  curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/vocoder-models/vocos-22khz-univ.onnx
+fi
+
+go mod tidy
+go build
+
+./offline-tts-play \
+  --matcha-acoustic-model=./matcha-icefall-en_US-ljspeech/model-steps-3.onnx \
+  --matcha-vocoder=./vocos-22khz-univ.onnx \
+  --matcha-tokens=./matcha-icefall-en_US-ljspeech/tokens.txt \
+  --matcha-data-dir=./matcha-icefall-en_US-ljspeech/espeak-ng-data \
+  --debug=1 \
+  "Friends fell out often because life was changing so fast. The easiest thing in the world was to lose touch with someone."
+
+