adpcm_argo_expand_nibble 2003 libavcodec/adpcm.c                 *samples++ = adpcm_argo_expand_nibble(cs, sign_extend(sample >> 4, 4), control, shift);
adpcm_argo_expand_nibble 2004 libavcodec/adpcm.c                 *samples++ = adpcm_argo_expand_nibble(cs, sign_extend(sample >> 0, 4), control, shift);