PITCH_FRAME_SIZE   54 libavfilter/af_arnndn.c #define PITCH_BUF_SIZE (PITCH_MAX_PERIOD+PITCH_FRAME_SIZE)
PITCH_FRAME_SIZE 1024 libavfilter/af_arnndn.c     pitch_search(pitch_buf+(PITCH_MAX_PERIOD>>1), pitch_buf, PITCH_FRAME_SIZE,
PITCH_FRAME_SIZE 1029 libavfilter/af_arnndn.c             PITCH_FRAME_SIZE, &pitch_index, st->last_period, st->last_gain);