diff --git a/libavcodec/ac3enc.c b/libavcodec/ac3enc.c
index 1a8a530e52..7e9e0b16ff 100644
--- a/libavcodec/ac3enc.c
+++ b/libavcodec/ac3enc.c
@@ -2049,8 +2049,7 @@ av_cold int ff_ac3_encode_close(AVCodecContext *avctx)
         av_freep(&block->cpl_coord_mant);
     }
 
-    if (s->mdct_end)
-        s->mdct_end(s);
+    s->mdct_end(s);
 
     return 0;
 }
@@ -2437,16 +2436,6 @@ av_cold int ff_ac3_encode_init(AVCodecContext *avctx)
         s->crc_inv[1] = pow_poly((CRC16_POLY >> 1), (8 * frame_size_58) - 16, CRC16_POLY);
     }
 
-    /* set function pointers */
-    if (CONFIG_AC3_FIXED_ENCODER && s->fixed_point) {
-        s->mdct_end                     = ff_ac3_fixed_mdct_end;
-        s->mdct_init                    = ff_ac3_fixed_mdct_init;
-        s->allocate_sample_buffers      = ff_ac3_fixed_allocate_sample_buffers;
-    } else if (CONFIG_AC3_ENCODER || CONFIG_EAC3_ENCODER) {
-        s->mdct_end                     = ff_ac3_float_mdct_end;
-        s->mdct_init                    = ff_ac3_float_mdct_init;
-        s->allocate_sample_buffers      = ff_ac3_float_allocate_sample_buffers;
-    }
     if (CONFIG_EAC3_ENCODER && s->eac3) {
         static AVOnce init_static_once = AV_ONCE_INIT;
         ff_thread_once(&init_static_once, ff_eac3_exponent_init);
diff --git a/libavcodec/ac3enc.h b/libavcodec/ac3enc.h
index 1e4a7405bf..b4e566b4ef 100644
--- a/libavcodec/ac3enc.h
+++ b/libavcodec/ac3enc.h
@@ -295,20 +295,8 @@ void ff_ac3_quantize_mantissas(AC3EncodeContext *s);
 void ff_ac3_output_frame(AC3EncodeContext *s, unsigned char *frame);
 
 
-/* prototypes for functions in ac3enc_fixed.c and ac3enc_float.c */
-
-void ff_ac3_fixed_mdct_end(AC3EncodeContext *s);
-void ff_ac3_float_mdct_end(AC3EncodeContext *s);
-
-int ff_ac3_fixed_mdct_init(AC3EncodeContext *s);
-int ff_ac3_float_mdct_init(AC3EncodeContext *s);
-
-
 /* prototypes for functions in ac3enc_template.c */
 
-int ff_ac3_fixed_allocate_sample_buffers(AC3EncodeContext *s);
-int ff_ac3_float_allocate_sample_buffers(AC3EncodeContext *s);
-
 int ff_ac3_fixed_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
                               const AVFrame *frame, int *got_packet_ptr);
 int ff_ac3_float_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
diff --git a/libavcodec/ac3enc_fixed.c b/libavcodec/ac3enc_fixed.c
index d2e67f3214..879e364d4e 100644
--- a/libavcodec/ac3enc_fixed.c
+++ b/libavcodec/ac3enc_fixed.c
@@ -115,7 +115,7 @@ static CoefType calc_cpl_coord(CoefSumType energy_ch, CoefSumType energy_cpl)
  *
  * @param s  AC-3 encoder private context
  */
-av_cold void ff_ac3_fixed_mdct_end(AC3EncodeContext *s)
+static av_cold void ac3_fixed_mdct_end(AC3EncodeContext *s)
 {
     ff_mdct_end(&s->mdct);
 }
@@ -127,7 +127,7 @@ av_cold void ff_ac3_fixed_mdct_end(AC3EncodeContext *s)
  * @param s  AC-3 encoder private context
  * @return   0 on success, negative error code on failure
  */
-av_cold int ff_ac3_fixed_mdct_init(AC3EncodeContext *s)
+static av_cold int ac3_fixed_mdct_init(AC3EncodeContext *s)
 {
     int ret = ff_mdct_init(&s->mdct, 9, 0, -1.0);
     s->mdct_window = ff_ac3_window;
@@ -139,6 +139,9 @@ static av_cold int ac3_fixed_encode_init(AVCodecContext *avctx)
 {
     AC3EncodeContext *s = avctx->priv_data;
     s->fixed_point = 1;
+    s->mdct_end                = ac3_fixed_mdct_end;
+    s->mdct_init               = ac3_fixed_mdct_init;
+    s->allocate_sample_buffers = allocate_sample_buffers;
     return ff_ac3_encode_init(avctx);
 }
 
diff --git a/libavcodec/ac3enc_float.c b/libavcodec/ac3enc_float.c
index 571f603182..ef23b417cf 100644
--- a/libavcodec/ac3enc_float.c
+++ b/libavcodec/ac3enc_float.c
@@ -94,7 +94,7 @@ static void sum_square_butterfly(AC3EncodeContext *s, float sum[4],
  *
  * @param s  AC-3 encoder private context
  */
-av_cold void ff_ac3_float_mdct_end(AC3EncodeContext *s)
+static av_cold void ac3_float_mdct_end(AC3EncodeContext *s)
 {
     ff_mdct_end(&s->mdct);
     av_freep(&s->mdct_window);
@@ -107,7 +107,7 @@ av_cold void ff_ac3_float_mdct_end(AC3EncodeContext *s)
  * @param s  AC-3 encoder private context
  * @return   0 on success, negative error code on failure
  */
-av_cold int ff_ac3_float_mdct_init(AC3EncodeContext *s)
+static av_cold int ac3_float_mdct_init(AC3EncodeContext *s)
 {
     float *window;
     int i, n, n2;
@@ -132,6 +132,9 @@ av_cold int ff_ac3_float_mdct_init(AC3EncodeContext *s)
 av_cold int ff_ac3_float_encode_init(AVCodecContext *avctx)
 {
     AC3EncodeContext *s = avctx->priv_data;
+    s->mdct_end                = ac3_float_mdct_end;
+    s->mdct_init               = ac3_float_mdct_init;
+    s->allocate_sample_buffers = allocate_sample_buffers;
     s->fdsp = avpriv_float_dsp_alloc(avctx->flags & AV_CODEC_FLAG_BITEXACT);
     if (!s->fdsp)
         return AVERROR(ENOMEM);
diff --git a/libavcodec/ac3enc_template.c b/libavcodec/ac3enc_template.c
index b74e38aea0..e8b964aa6a 100644
--- a/libavcodec/ac3enc_template.c
+++ b/libavcodec/ac3enc_template.c
@@ -38,7 +38,7 @@
 #include "eac3enc.h"
 
 
-int AC3_NAME(allocate_sample_buffers)(AC3EncodeContext *s)
+static int allocate_sample_buffers(AC3EncodeContext *s)
 {
     int ch;