SILK_MAX_LAG      515 libavcodec/opus_silk.c     float lpc_leadin[16], lpc_body[16], residual[SILK_MAX_LAG + SILK_HISTORY];
SILK_MAX_LAG      665 libavcodec/opus_silk.c     silk_decode_excitation(s, rc, residual + SILK_MAX_LAG, qoffset_high,
SILK_MAX_LAG      676 libavcodec/opus_silk.c         float *resptr = residual           + SILK_MAX_LAG + i * s->sflength;