diff --git a/libavcodec/aacdec_template.c b/libavcodec/aacdec_template.c
index 2b3509c85f..28f4b8110b 100644
--- a/libavcodec/aacdec_template.c
+++ b/libavcodec/aacdec_template.c
@@ -1130,8 +1130,8 @@ static av_cold void aac_static_table_init(void)
     ff_aacdec_common_init_once();
 
     // window initialization
-    AAC_RENAME(avpriv_kbd_window_init)(AAC_RENAME(aac_kbd_long_960), 4.0, 960);
-    AAC_RENAME(avpriv_kbd_window_init)(AAC_RENAME(aac_kbd_short_120), 6.0, 120);
+    AAC_RENAME(ff_kbd_window_init)(AAC_RENAME(aac_kbd_long_960), 4.0, 960);
+    AAC_RENAME(ff_kbd_window_init)(AAC_RENAME(aac_kbd_short_120), 6.0, 120);
 
 #if !USE_FIXED
     AAC_RENAME(ff_sine_window_init)(AAC_RENAME(sine_960), 960);
@@ -1139,8 +1139,8 @@ static av_cold void aac_static_table_init(void)
     AAC_RENAME(ff_init_ff_sine_windows)(9);
     ff_aac_float_common_init();
 #else
-    AAC_RENAME(avpriv_kbd_window_init)(AAC_RENAME2(aac_kbd_long_1024), 4.0, 1024);
-    AAC_RENAME(avpriv_kbd_window_init)(AAC_RENAME2(aac_kbd_short_128), 6.0, 128);
+    AAC_RENAME(ff_kbd_window_init)(AAC_RENAME2(aac_kbd_long_1024), 4.0, 1024);
+    AAC_RENAME(ff_kbd_window_init)(AAC_RENAME2(aac_kbd_short_128), 6.0, 128);
     init_sine_windows_fixed();
 #endif
 
diff --git a/libavcodec/aactab.c b/libavcodec/aactab.c
index 63a478f33f..f34c1ac69e 100644
--- a/libavcodec/aactab.c
+++ b/libavcodec/aactab.c
@@ -94,8 +94,8 @@ static av_cold void aac_float_common_init(void)
 {
     aac_tableinit();
 
-    avpriv_kbd_window_init(ff_aac_kbd_long_1024, 4.0, 1024);
-    avpriv_kbd_window_init(ff_aac_kbd_short_128, 6.0, 128);
+    ff_kbd_window_init(ff_aac_kbd_long_1024, 4.0, 1024);
+    ff_kbd_window_init(ff_aac_kbd_short_128, 6.0, 128);
     ff_init_ff_sine_windows(10);
     ff_init_ff_sine_windows(7);
 }
diff --git a/libavcodec/ac3dec.c b/libavcodec/ac3dec.c
index ee50138605..3db71fed39 100644
--- a/libavcodec/ac3dec.c
+++ b/libavcodec/ac3dec.c
@@ -228,7 +228,7 @@ static av_cold int ac3_decode_init(AVCodecContext *avctx)
     if ((ret = av_tx_init(&s->tx_256, &s->tx_fn_256, IMDCT_TYPE, 1, 256, &scale, 0)))
         return ret;
 
-    AC3_RENAME(avpriv_kbd_window_init)(s->window, 5.0, 256);
+    AC3_RENAME(ff_kbd_window_init)(s->window, 5.0, 256);
     ff_bswapdsp_init(&s->bdsp);
 
 #if (USE_FIXED)
diff --git a/libavcodec/ac3enc_fixed.c b/libavcodec/ac3enc_fixed.c
index 079a43dc39..88dfd66b91 100644
--- a/libavcodec/ac3enc_fixed.c
+++ b/libavcodec/ac3enc_fixed.c
@@ -82,7 +82,7 @@ static av_cold int ac3_fixed_mdct_init(AC3EncodeContext *s)
     if (!iwin)
         return AVERROR(ENOMEM);
 
-    avpriv_kbd_window_init(fwin, 5.0, AC3_BLOCK_SIZE);
+    ff_kbd_window_init(fwin, 5.0, AC3_BLOCK_SIZE);
     for (int i = 0; i < AC3_BLOCK_SIZE; i++)
         iwin[i] = lrintf(fwin[i] * (1 << 22));
 
diff --git a/libavcodec/ac3enc_float.c b/libavcodec/ac3enc_float.c
index 9664adbf63..ae351a535e 100644
--- a/libavcodec/ac3enc_float.c
+++ b/libavcodec/ac3enc_float.c
@@ -92,7 +92,7 @@ static av_cold int ac3_float_mdct_init(AC3EncodeContext *s)
         return AVERROR(ENOMEM);
     }
 
-    avpriv_kbd_window_init(window, 5.0, AC3_BLOCK_SIZE);
+    ff_kbd_window_init(window, 5.0, AC3_BLOCK_SIZE);
     s->mdct_window = window;
 
     return av_tx_init(&s->tx, &s->tx_fn, AV_TX_FLOAT_MDCT, 0,
diff --git a/libavcodec/dolby_e.c b/libavcodec/dolby_e.c
index b8dac0fa3f..921c33f3ba 100644
--- a/libavcodec/dolby_e.c
+++ b/libavcodec/dolby_e.c
@@ -1200,7 +1200,7 @@ static av_cold void init_tables(void)
         gain_tab[i] = exp2f((i - 960) / 64.0f);
 
     // short 1
-    avpriv_kbd_window_init(window, 3.0f, 128);
+    ff_kbd_window_init(window, 3.0f, 128);
     for (i = 0; i < 128; i++)
         window[128 + i] = window[127 - i];
 
@@ -1227,7 +1227,7 @@ static av_cold void init_tables(void)
         window[1088 + i] = 1.0f;
 
     // long
-    avpriv_kbd_window_init(window + 1408, 3.0f, 256);
+    ff_kbd_window_init(window + 1408, 3.0f, 256);
     for (i = 0; i < 640; i++)
         window[1664 + i] = 1.0f;
     for (i = 0; i < 256; i++)
diff --git a/libavcodec/kbdwin.c b/libavcodec/kbdwin.c
index ff7a7d614e..cb73ceb160 100644
--- a/libavcodec/kbdwin.c
+++ b/libavcodec/kbdwin.c
@@ -17,27 +17,23 @@
  */
 
 #include "libavutil/avassert.h"
-#include "libavutil/error.h"
 #include "libavutil/libm.h"
 #include "libavutil/mathematics.h"
 #include "libavutil/attributes.h"
-#include "libavutil/mem.h"
 #include "kbdwin.h"
 
-av_cold static int kbd_window_init(float *float_window, int *int_window, float alpha, int n)
+av_cold static void kbd_window_init(float *float_window, int *int_window, float alpha, int n)
 {
    int i;
    double sum = 0.0, tmp;
    double scale = 0.0;
-   double temp_small[FF_KBD_WINDOW_MAX / 2 + 1];
-   double *temp= n<=FF_KBD_WINDOW_MAX ? temp_small : av_malloc((n/2+1) * sizeof(*temp));
+   double temp[FF_KBD_WINDOW_MAX / 2 + 1];
    double alpha2 = 4 * (alpha * M_PI / n) * (alpha * M_PI / n);
 
-   if (!temp)
-       return AVERROR(ENOMEM);
+   av_assert0(n <= FF_KBD_WINDOW_MAX);
 
    for (i = 0; i <= n / 2; i++) {
-       tmp = alpha2 * i * (n - i);
+       tmp = i * (n - i) * alpha2;
        temp[i] = av_bessel_i0(sqrt(tmp));
        scale += temp[i] * (1 + (i && i<n/2));
    }
@@ -53,17 +49,14 @@ av_cold static int kbd_window_init(float *float_window, int *int_window, float a
        if (float_window) float_window[i] = sqrt(sum * scale);
        else                int_window[i] = lrint(2147483647 * sqrt(sum * scale));
    }
-   if (temp != temp_small)
-       av_free(temp);
-   return 0;
 }
 
-av_cold int avpriv_kbd_window_init(float *window, float alpha, int n)
+av_cold void ff_kbd_window_init(float *window, float alpha, int n)
 {
-    return kbd_window_init(window, NULL, alpha, n);
+    kbd_window_init(window, NULL, alpha, n);
 }
 
-av_cold int avpriv_kbd_window_init_fixed(int32_t *window, float alpha, int n)
+av_cold void ff_kbd_window_init_fixed(int32_t *window, float alpha, int n)
 {
-    return kbd_window_init(NULL, window, alpha, n);
+    kbd_window_init(NULL, window, alpha, n);
 }
diff --git a/libavcodec/kbdwin.h b/libavcodec/kbdwin.h
index 0cb2073c5f..4185c4206f 100644
--- a/libavcodec/kbdwin.h
+++ b/libavcodec/kbdwin.h
@@ -22,7 +22,7 @@
 #include <stdint.h>
 
 /**
- * Maximum window size for avpriv_kbd_window_init.
+ * Maximum window size for ff_kbd_window_init.
  */
 #define FF_KBD_WINDOW_MAX 1024
 
@@ -30,11 +30,9 @@
  * Generate a Kaiser-Bessel Derived Window.
  * @param   window  pointer to half window
  * @param   alpha   determines window shape
- * @param   n       size of half window
- *
- * @return if n is larger than FF_KBD_WINDOW_MAX then AVERROR(ENOMEM) is possible
+ * @param   n       size of half window, max FF_KBD_WINDOW_MAX
  */
-int avpriv_kbd_window_init(float *window, float alpha, int n);
-int avpriv_kbd_window_init_fixed(int32_t *window, float alpha, int n);
+void ff_kbd_window_init(float *window, float alpha, int n);
+void ff_kbd_window_init_fixed(int32_t *window, float alpha, int n);
 
 #endif /* AVCODEC_KBDWIN_H */
