Adjust: init data

app/src/main/cpp/audio_player.cpp

@@ -286,9 +286,6 @@ AUDIO_PLAYER_FUNC(void, play, jstring input_jstr, jstring filter_jstr) {
     jmethodID fft_method = env->GetMethodID(player_class, "fftCallbackFromJNI", "([S)V");
 
     auto *fft_filter = static_cast<filter_sys_t *>(malloc(sizeof(filter_sys_t)));
-    fft_filter->nb_samples = 0;
-    fft_filter->data_size = 0;
-    fft_filter->data = nullptr;
     init_visualizer(fft_filter);
 
     //read audio frame

app/src/main/cpp/visualizer/execute_fft.c

@@ -203,6 +203,9 @@ int init_visualizer(filter_sys_t *p_filter)
     /* Fetch the FFT window parameters */
     window_get_param(&p_filter->wind_param);
 
+    p_filter->data = NULL;
+    p_filter->data_size = 0;
+    p_filter->nb_samples = 0;
     p_filter->out_samples = FFT_BUFFER_SIZE;
     p_filter->output = (int16_t *) (malloc(p_filter->out_samples * sizeof(int16_t)));
     return 0;