@@ -289,20 +289,29 @@ static int eq(const int16_t *in, int *target)

     return retval;

 }

-static int dec2(int16_t *decsp, const int *data, const int *inp,

-                 int f, const int *inp2, int a)

+static int dec2(RA144Context *ractx, int16_t *decsp, int block_num,

+                int copynew, int f)

 {

     int work[10];

+    int a = block_num + 1;

     int b = NBLOCKS - a;

     int x;

+    // Interpolate block coefficients from the this frame forth block and

+    // last frame forth block

     for (x=0; x<30; x++)

-        decsp[x] = (a * inp[x] + b * inp2[x]) >> 2;

-

-    if (eq(decsp, work))

-        return dec1(decsp, data, inp, f);

-    else

+        decsp[x] = (a * ractx->lpc_coef[x] + b * ractx->lpc_coef_old[x])>> 2;

+

+    if (eq(decsp, work)) {

+        // The interpolated coefficients are unstable, copy either new or old

+        // coefficients

+        if (copynew)

+            return dec1(decsp, ractx->lpc_refl, ractx->lpc_coef, f);

+        else

+            return dec1(decsp, ractx->lpc_refl_old, ractx->lpc_coef_old, f);

+    } else {

         return rms(work, f);

+    }

 }

 /* Uncompress one block (20 bytes -> 160*2 bytes) */

@@ -337,13 +346,9 @@ static int ra144_decode_frame(AVCodecContext * avctx,

     energy = decodeval[get_bits(&gb, 5) << 1]; // Useless table entries?

     a = t_sqrt(energy*ractx->old_energy) >> 12;

-    gbuf1[0] = dec2(gbuf2[0], ractx->lpc_refl_old, ractx->lpc_coef_old, ractx->old_energy, ractx->lpc_coef, 3);

-    if (ractx->old_energy < energy) {

-        gbuf1[1] = dec2(gbuf2[1], ractx->lpc_refl, ractx->lpc_coef, a, ractx->lpc_coef_old, 2);

-    } else {

-        gbuf1[1] = dec2(gbuf2[1], ractx->lpc_refl_old, ractx->lpc_coef_old, a, ractx->lpc_coef, 2);

-    }

-    gbuf1[2] = dec2(gbuf2[2], ractx->lpc_refl, ractx->lpc_coef, energy, ractx->lpc_coef_old, 3);

+    gbuf1[0] = dec2(ractx, gbuf2[0], 0, 0, ractx->old_energy);

+    gbuf1[1] = dec2(ractx, gbuf2[1], 1, energy > ractx->old_energy, a);

+    gbuf1[2] = dec2(ractx, gbuf2[2], 2, 1, energy);

     gbuf1[3] = dec1(gbuf2[3], ractx->lpc_refl, ractx->lpc_coef, energy);

     /* do output */