X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Ffft_init_table.c;h=83e35ffb7c844d777935bebad4decb9ed45dd966;hb=1c7f252783aec37e4ff8049476386f63afe91756;hp=c488018f62a316e42d63f75e17cd48834ef383b8;hpb=762c2b5dcd99a08452299cd1f83070f88115f1f3;p=ffmpeg

diff --git a/libavcodec/fft_init_table.c b/libavcodec/fft_init_table.c
index c488018f62a..83e35ffb7c8 100644
--- a/libavcodec/fft_init_table.c
+++ b/libavcodec/fft_init_table.c
@@ -51,6 +51,8 @@
  * @file
  * definitions and initialization of LUT table for FFT
  */
+#include "libavutil/thread.h"
+
 #include "libavcodec/fft_table.h"
 
 const int32_t ff_w_tab_sr[MAX_FFT_SIZE/(4*16)] = {
@@ -314,15 +316,29 @@ const int32_t ff_w_tab_sr[MAX_FFT_SIZE/(4*16)] = {
 
 uint16_t ff_fft_offsets_lut[21845];
 
-void ff_fft_lut_init(uint16_t *table, int off, int size, int *index)
+static void fft_lut_init(uint16_t *table, int off, int size, int *index)
 {
     if (size < 16) {
         table[*index] = off >> 2;
         (*index)++;
     }
     else {
-        ff_fft_lut_init(table, off, size>>1, index);
-        ff_fft_lut_init(table, off+(size>>1), size>>2, index);
-        ff_fft_lut_init(table, off+3*(size>>2), size>>2, index);
+        fft_lut_init(table, off,                   size >> 1, index);
+        fft_lut_init(table, off +     (size >> 1), size >> 2, index);
+        fft_lut_init(table, off + 3 * (size >> 2), size >> 2, index);
     }
 }
+
+static void fft_lut_init_start(void)
+{
+    int n = 0;
+
+    fft_lut_init(ff_fft_offsets_lut, 0, 1 << 17, &n);
+}
+
+void ff_fft_lut_init(void)
+{
+    static AVOnce init_once = AV_ONCE_INIT;
+
+    ff_thread_once(&init_once, fft_lut_init_start);
+}