static int eval_refl(const int16_t *coefs, int *refl, RA144Context *ractx) { int retval = 0; int b, c, i; unsigned int u; int buffer1[10]; int buffer2[10]; int *bp1 = buffer1; int *bp2 = buffer2; for (i=0; i < 10; i++) buffer2[i] = coefs[i]; u = refl[9] = bp2[9]; if (u + 0x1000 > 0x1fff) { av_log(ractx, AV_LOG_ERROR, "Overflow. Broken sample?\n"); return 0; } for (c=8; c >= 0; c--) { if (u == 0x1000) u++; if (u == 0xfffff000) u--; b = 0x1000-((u * u) >> 12); if (b == 0) b++; for (u=0; u<=c; u++) bp1[u] = ((bp2[u] - ((refl[c+1] * bp2[c-u]) >> 12)) * (0x1000000 / b)) >> 12; refl[c] = u = bp1[c]; if ((u + 0x1000) > 0x1fff) retval = 1; FFSWAP(int *, bp1, bp2); } return retval; }