define MIN_FFT_SIZE

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

@@ -224,7 +224,7 @@ void release_visualizer(filter_sys_t *p_filter)
 }
 
 int ensure_memory(filter_sys_t *fft_filter, int nb_samples) {
-    if (nb_samples != fft_filter->nb_samples && nb_samples > fft_filter->out_samples) {
+    if (nb_samples != fft_filter->nb_samples && nb_samples >= MIN_FFT_SIZE) {
         if (!fft_filter->data) {
             fft_filter->data_size = nb_samples;
             fft_filter->data = (uint8_t *) (malloc(nb_samples * sizeof(uint8_t)));

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

@@ -17,6 +17,8 @@ extern "C" {
 
 #include "block_queue.h"
 
+#define MIN_FFT_SIZE 128
+
 typedef struct
 {
     pthread_t thread;