change to output

main.cpp

@@ -7,6 +7,7 @@ int main() {
     const int sample_rate = 48000;
     const float freq = 50.0f;
     float phase = 0.0f;
+    int duration = 1;
 
     PipeMini audio;
 
@@ -25,8 +26,8 @@ int main() {
         return 1;
     }
 
-    printf("playing %f Hz sine for 5 seconds...\n", freq);
-    sleep(1);
+    printf("playing %f Hz sine for %d seconds...\n", freq, duration);
+    sleep(duration);
 
     return 0;
 }