adpcm_ima_mtf_expand_nibble 2025 libavcodec/adpcm.c                 *samples++  = adpcm_ima_mtf_expand_nibble(&c->status[channel], v >> 4);
adpcm_ima_mtf_expand_nibble 2026 libavcodec/adpcm.c                 samples[st] = adpcm_ima_mtf_expand_nibble(&c->status[channel], v & 0x0F);