Add ff_ prefix to ac3_common_init().

Signed-off-by: Mans Rullgard <mans@mansr.com>
(cherry picked from commit 4c57cde9)

libavcodec/ac3.c

@@ -241,7 +241,7 @@ void ff_ac3_bit_alloc_calc_bap(int16_t *mask, int16_t *psd, int start, int end,
  * note: This function must remain thread safe because it is called by the
  *       AVParser init code.
  */
-av_cold void ac3_common_init(void)
+av_cold void ff_ac3_common_init(void)
 {
 #if !CONFIG_HARDCODED_TABLES
     /* compute bin_to_band_tab from band_start_tab */

libavcodec/ac3.h

@@ -115,7 +115,7 @@ typedef enum {
     EAC3_FRAME_TYPE_RESERVED
 } EAC3FrameType;
 
-void ac3_common_init(void);
+void ff_ac3_common_init(void);
 
 /**
  * Calculate the log power-spectral density of the input signal.

libavcodec/ac3dec.c

@@ -187,7 +187,7 @@ static av_cold int ac3_decode_init(AVCodecContext *avctx)
     AC3DecodeContext *s = avctx->priv_data;
     s->avctx = avctx;
 
-    ac3_common_init();
+    ff_ac3_common_init();
     ac3_tables_init();
     ff_mdct_init(&s->imdct_256, 8, 1, 1.0);
     ff_mdct_init(&s->imdct_512, 9, 1, 1.0);

libavcodec/ac3enc.c

@@ -1815,7 +1815,7 @@ static av_cold int ac3_encode_init(AVCodecContext *avctx)
 
     avctx->frame_size = AC3_FRAME_SIZE;
 
-    ac3_common_init();
+    ff_ac3_common_init();
 
     ret = validate_options(avctx, s);
     if (ret)