small fixes

main.py

@@ -131,7 +131,10 @@ gcc \
 
 Now you can run
 ```bash
-/tmp/test-piper
+cd /tmp
+
+# Assume you have downloaded the model and extracted it to /tmp
+./test-piper
 ```
 
 > You probably need to run
@@ -230,6 +233,13 @@ This model is converted from <{m.url}>
 | {m.ns} | {m.sr} |
 
         """
+    s += f"""
+
+Model download address
+
+<https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/{d}.tar.bz2>
+
+    """
 
     s += get_android_apk(m)
     s += get_c_api(m)

piper/templates/c-api-example.c.in

@@ -15,15 +15,17 @@ int main() {
 
   int sid = 0; // speaker id
   const char *text = "{{text}}";
+
   const SherpaOnnxGeneratedAudio *audio =
       SherpaOnnxOfflineTtsGenerate(tts, text, sid, 1.0);
 
   SherpaOnnxWriteWave(audio->samples, audio->n, audio->sample_rate,
                       "./test.wav");
 
+  // You need to free the pointers to avoid memory leak in your app
   SherpaOnnxDestroyOfflineTtsGeneratedAudio(audio);
-
   SherpaOnnxDestroyOfflineTts(tts);
+
   printf("Saved to ./test.wav\n");
 
   return 0;