SCO_TX_PACKER_BUF_NUM
(bt->tx->packet_r % SCO_TX_PACKER_BUF_NUM) *
#define BTCVSD_TX_BUF_SIZE (BTCVSD_TX_PACKET_SIZE * SCO_TX_PACKER_BUF_NUM)
cur_write_idx = (bt->tx->packet_w % SCO_TX_PACKER_BUF_NUM) *