libavcodec/adpcm.c:1124: error: Uninitialized Value
  The value read from shift[_] was never initialized.

libavcodec/adpcm.c:1124:21: 
1122.                     int byte = bytestream2_get_byteu(&gb);
1123. 
1124.                     level = sign_extend(byte >> 4, 4) << shift[n];
                          ^
1125.                     pred  = s[-1] * coeff[0][n] + s[-2] * coeff[1][n];
1126.                     s[0]  = av_clip_int16((level + pred + 0x80) >> 8);
