synth_tones      1695 libavcodec/dca_lbr.c         synth_tones(s, ch, values, group, (group_sf - 1) & 31, 30 - synth_idx);
synth_tones      1696 libavcodec/dca_lbr.c         synth_tones(s, ch, values, group, (group_sf    ) & 31,      synth_idx);