cast to concrete type

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

@@ -44,7 +44,7 @@ int open_visualizer(filter_sys_t *p_sys)
 
 block_t *filter_audio(filter_sys_t *p_sys, void *p_in_buf)
 {
-    return vlc_queue_push(&p_sys->queue, p_in_buf);
+    return (block_t *) vlc_queue_push(&p_sys->queue, p_in_buf);
 }
 
 void close_visualizer(filter_sys_t *p_filter)
@@ -73,7 +73,7 @@ static void *fft_thread(void *p_data)
     float height[NB_BANDS] = {0};
     LOGE("start FFT thread...");
 
-    while ((block = vlc_queue_pop(&p_sys->queue)))
+    while ((block = (block_t *) vlc_queue_pop(&p_sys->queue)))
     {
         LOGE("running FFT transform...");
         /* Horizontal scale for 20-band equalizer */
@@ -102,7 +102,7 @@ static void *fft_thread(void *p_data)
         if (block->i_nb_samples != p_sys->i_prev_nb_samples)
         {
             free(p_sys->p_prev_s16_buff);
-            p_sys->p_prev_s16_buff = malloc(block->i_nb_samples *
+            p_sys->p_prev_s16_buff = (short *) malloc(block->i_nb_samples *
                                             p_sys->i_channels *
                                             sizeof(int16_t));
             if (!p_sys->p_prev_s16_buff)
@@ -268,7 +268,7 @@ void fft_once(filter_sys_t *p_sys)
     if (nb_samples != p_sys->i_prev_nb_samples)
     {
         free(p_sys->p_prev_s16_buff);
-        p_sys->p_prev_s16_buff = malloc(nb_samples *
+        p_sys->p_prev_s16_buff = (short *) malloc(nb_samples *
                                         p_sys->i_channels *
                                         sizeof(int16_t));
         if (!p_sys->p_prev_s16_buff)

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

@@ -5,33 +5,41 @@
 #ifndef EXECUTE_FFT_H
 #define EXECUTE_FFT_H
 
+#include <math.h>
+#include <unistd.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #include "block_queue.h"
 #include "fft.h"
 #include "window.h"
 
-#include <math.h>
-#include <unistd.h>
+#ifdef __cplusplus
+}
+#endif
 
 typedef struct
 {
-    pthread_t thread;
-    vlc_queue_t queue;
-    bool dead;
-    int i_channels;
-    int i_prev_nb_samples;
-    int16_t *p_prev_s16_buff;
-
-    float f_rotationAngle;
-    float f_rotationIncrement;
-
-    /* FFT window parameters */
-    window_param wind_param;
-
-    uint8_t *data;
-    int data_size;
-    int nb_samples;
-    int8_t *output;
-    int out_samples;
+pthread_t thread;
+vlc_queue_t queue;
+bool dead;
+int i_channels;
+int i_prev_nb_samples;
+int16_t *p_prev_s16_buff;
+
+float f_rotationAngle;
+float f_rotationIncrement;
+
+/* FFT window parameters */
+window_param wind_param;
+
+uint8_t *data;
+int data_size;
+int nb_samples;
+int8_t *output;
+int out_samples;
 } filter_sys_t;
 
 static void *fft_thread(void *);