libavcodec/adpcm.c:1128: error: Uninitialized Value
  The value read from shift[_] was never initialized.

libavcodec/adpcm.c:1128:21: 
1126.                     s[0]  = av_clip_int16((level + pred + 0x80) >> 8);
1127. 
1128.                     level = sign_extend(byte, 4) << shift[n];
                          ^
1129.                     pred  = s[0] * coeff[0][n] + s[-1] * coeff[1][n];
1130.                     s[1]  = av_clip_int16((level + pred + 0x80) >> 8);
