diff --git a/libavcodec/ra144.c b/libavcodec/ra144.c
index c528c3274a..35b7921ec4 100644
--- a/libavcodec/ra144.c
+++ b/libavcodec/ra144.c
@@ -21,6 +21,7 @@
 
 #include <stdint.h>
 #include "avcodec.h"
+#include "celp_filters.h"
 #include "ra144.h"
 
 const int16_t ff_gain_val_tab[256][3] = {
@@ -1684,3 +1685,36 @@ int ff_irms(const int16_t *data)
 
     return 0x20000000 / (ff_t_sqrt(sum) >> 8);
 }
+
+void ff_subblock_synthesis(RA144Context *ractx, const uint16_t *lpc_coefs,
+                           int cba_idx, int cb1_idx, int cb2_idx,
+                           int gval, int gain)
+{
+    uint16_t buffer_a[40];
+    uint16_t *block;
+    int m[3];
+
+    if (cba_idx) {
+        cba_idx += BLOCKSIZE/2 - 1;
+        ff_copy_and_dup(buffer_a, ractx->adapt_cb, cba_idx);
+        m[0] = (ff_irms(buffer_a) * gval) >> 12;
+    } else {
+        m[0] = 0;
+    }
+    m[1] = (ff_cb1_base[cb1_idx] * gval) >> 8;
+    m[2] = (ff_cb2_base[cb2_idx] * gval) >> 8;
+    memmove(ractx->adapt_cb, ractx->adapt_cb + BLOCKSIZE,
+            (BUFFERSIZE - BLOCKSIZE) * sizeof(*ractx->adapt_cb));
+
+    block = ractx->adapt_cb + BUFFERSIZE - BLOCKSIZE;
+
+    ff_add_wav(block, gain, cba_idx, m, cba_idx? buffer_a: NULL,
+               ff_cb1_vects[cb1_idx], ff_cb2_vects[cb2_idx]);
+
+    memcpy(ractx->curr_sblock, ractx->curr_sblock + 40,
+           10*sizeof(*ractx->curr_sblock));
+
+    if (ff_celp_lp_synthesis_filter(ractx->curr_sblock + 10, lpc_coefs,
+                                    block, BLOCKSIZE, 10, 1, 0xfff))
+        memset(ractx->curr_sblock, 0, 50*sizeof(*ractx->curr_sblock));
+}
diff --git a/libavcodec/ra144.h b/libavcodec/ra144.h
index 26ca5a5fb8..bffa8b337a 100644
--- a/libavcodec/ra144.h
+++ b/libavcodec/ra144.h
@@ -61,6 +61,9 @@ int ff_interp(RA144Context *ractx, int16_t *out, int a, int copyold,
               int energy);
 unsigned int ff_rescale_rms(unsigned int rms, unsigned int energy);
 int ff_irms(const int16_t *data);
+void ff_subblock_synthesis(RA144Context *ractx, const uint16_t *lpc_coefs,
+                           int cba_idx, int cb1_idx, int cb2_idx,
+                           int gval, int gain);
 
 extern const int16_t ff_gain_val_tab[256][3];
 extern const uint8_t ff_gain_exp_tab[256];
diff --git a/libavcodec/ra144dec.c b/libavcodec/ra144dec.c
index b6888f5dc2..5b391d4675 100644
--- a/libavcodec/ra144dec.c
+++ b/libavcodec/ra144dec.c
@@ -26,7 +26,6 @@
 #include "avcodec.h"
 #include "get_bits.h"
 #include "ra144.h"
-#include "celp_filters.h"
 
 
 static av_cold int ra144_decode_init(AVCodecContext * avctx)
@@ -45,39 +44,13 @@ static av_cold int ra144_decode_init(AVCodecContext * avctx)
 static void do_output_subblock(RA144Context *ractx, const uint16_t  *lpc_coefs,
                                int gval, GetBitContext *gb)
 {
-    uint16_t buffer_a[40];
-    uint16_t *block;
     int cba_idx = get_bits(gb, 7); // index of the adaptive CB, 0 if none
     int gain    = get_bits(gb, 8);
     int cb1_idx = get_bits(gb, 7);
     int cb2_idx = get_bits(gb, 7);
-    int m[3];
 
-    if (cba_idx) {
-        cba_idx += BLOCKSIZE/2 - 1;
-        ff_copy_and_dup(buffer_a, ractx->adapt_cb, cba_idx);
-        m[0] = (ff_irms(buffer_a) * gval) >> 12;
-    } else {
-        m[0] = 0;
-    }
-
-    m[1] = (ff_cb1_base[cb1_idx] * gval) >> 8;
-    m[2] = (ff_cb2_base[cb2_idx] * gval) >> 8;
-
-    memmove(ractx->adapt_cb, ractx->adapt_cb + BLOCKSIZE,
-            (BUFFERSIZE - BLOCKSIZE) * sizeof(*ractx->adapt_cb));
-
-    block = ractx->adapt_cb + BUFFERSIZE - BLOCKSIZE;
-
-    ff_add_wav(block, gain, cba_idx, m, cba_idx? buffer_a: NULL,
-               ff_cb1_vects[cb1_idx], ff_cb2_vects[cb2_idx]);
-
-    memcpy(ractx->curr_sblock, ractx->curr_sblock + 40,
-           10*sizeof(*ractx->curr_sblock));
-
-    if (ff_celp_lp_synthesis_filter(ractx->curr_sblock + 10, lpc_coefs,
-                                    block, BLOCKSIZE, 10, 1, 0xfff))
-        memset(ractx->curr_sblock, 0, 50*sizeof(*ractx->curr_sblock));
+    ff_subblock_synthesis(ractx, lpc_coefs, cba_idx, cb1_idx, cb2_idx, gval,
+                          gain);
 }
 
 /** Uncompress one block (20 bytes -> 160*2 bytes). */