libavcodec/adpcm.c:1339: error: Uninitialized Value
  The value read from shift[_] was never initialized.

libavcodec/adpcm.c:1339:25: 
1337.                 for (n=0; n<4; n++, src++, s+=32*avctx->channels) {
1338.                     for (s2=s, i=0; i<8; i+=4, s2+=avctx->channels) {
1339.                         int level = ((*src & (0xF0>>i)) << (24+i)) >> shift[n];
                              ^
1340.                         int pred  = s2[-1*avctx->channels] * coeff[0][n]
1341.                                   + s2[-2*avctx->channels] * coeff[1][n];
