/*******************************************************************************
**
** Function avdt_ad_open_req
**
** Description This function is called by a CCB or SCB to open a transport
** channel. This function allocates and initializes a
** transport channel table entry. The channel can be opened
** in two roles: as an initiator or acceptor. When opened
** as an initiator the function will start an L2CAP connection.
** When opened as an acceptor the function simply configures
** the table entry to listen for an incoming channel.
**
**
** Returns Nothing.
**
*******************************************************************************/
void avdt_ad_open_req(UINT8 type, tAVDT_CCB *p_ccb, tAVDT_SCB *p_scb, UINT8 role)
{
tAVDT_TC_TBL *p_tbl;
UINT16 lcid;
if ((p_tbl = avdt_ad_tc_tbl_alloc(p_ccb)) == NULL) {
AVDT_TRACE_ERROR("avdt_ad_open_req: Cannot allocate p_tbl");
return;
}
p_tbl->tcid = avdt_ad_type_to_tcid(type, p_scb);
AVDT_TRACE_DEBUG("avdt_ad_open_req: type: %d, role: %d, tcid:%d\n",
type, role, p_tbl->tcid);
if (type == AVDT_CHAN_SIG) {
/* if signaling, get mtu from registration control block */
p_tbl->my_mtu = avdt_cb.rcb.ctrl_mtu;
p_tbl->my_flush_to = L2CAP_DEFAULT_FLUSH_TO;
} else {
/* otherwise get mtu from scb */
p_tbl->my_mtu = p_scb->cs.mtu;
p_tbl->my_flush_to = p_scb->cs.flush_to;
/* also set scb_hdl in rt_tbl */
avdt_cb.ad.rt_tbl[avdt_ccb_to_idx(p_ccb)][p_tbl->tcid].scb_hdl = avdt_scb_to_hdl(p_scb);
AVDT_TRACE_DEBUG("avdt_cb.ad.rt_tbl[%d][%d].scb_hdl = %d\n",
avdt_ccb_to_idx(p_ccb), p_tbl->tcid,
avdt_scb_to_hdl(p_scb));
}
/* if we're acceptor, we're done; just sit back and listen */
if (role == AVDT_ACP) {
p_tbl->state = AVDT_AD_ST_ACP;
}
/* else we're inititator, start the L2CAP connection */
else {
p_tbl->state = AVDT_AD_ST_CONN;
/* call l2cap connect req */
if ((lcid = L2CA_ConnectReq(AVDT_PSM, p_ccb->peer_addr)) != 0) {
/* if connect req ok, store tcid in lcid table */
avdt_cb.ad.lcid_tbl[lcid - L2CAP_BASE_APPL_CID] = avdt_ad_tc_tbl_to_idx(p_tbl);
AVDT_TRACE_DEBUG("avdt_cb.ad.lcid_tbl[%d] = %d\n",
(lcid - L2CAP_BASE_APPL_CID), avdt_ad_tc_tbl_to_idx(p_tbl));
avdt_cb.ad.rt_tbl[avdt_ccb_to_idx(p_ccb)][p_tbl->tcid].lcid = lcid;
AVDT_TRACE_DEBUG("avdt_cb.ad.rt_tbl[%d][%d].lcid = 0x%x\n",
avdt_ccb_to_idx(p_ccb), p_tbl->tcid,
lcid);
} else {
/* if connect req failed, call avdt_ad_tc_close_ind() */
avdt_ad_tc_close_ind(p_tbl, 0);
}
}
}
/*******************************************************************************
**
** Function avdt_scb_event
**
** Description State machine event handling function for scb
**
**
** Returns Nothing.
**
*******************************************************************************/
void avdt_scb_event(tAVDT_SCB *p_scb, UINT8 event, tAVDT_SCB_EVT *p_data)
{
tAVDT_SCB_ST_TBL state_table;
UINT8 action;
int i;
#if AVDT_DEBUG == TRUE
AVDT_TRACE_EVENT("SCB hdl=%d event=%d/%s state=%s\n", avdt_scb_to_hdl(p_scb), event, avdt_scb_evt_str[event], avdt_scb_st_str[p_scb->state]);
#endif
/* set current event */
p_scb->curr_evt = event;
/* look up the state table for the current state */
state_table = avdt_scb_st_tbl[p_scb->state];
/* set next state */
if (p_scb->state != state_table[event][AVDT_SCB_NEXT_STATE]) {
p_scb->state = state_table[event][AVDT_SCB_NEXT_STATE];
}
/* execute action functions */
for (i = 0; i < AVDT_SCB_ACTIONS; i++) {
if ((action = state_table[event][i]) != AVDT_SCB_IGNORE) {
(*avdt_cb.p_scb_act[action])(p_scb, p_data);
} else {
break;
}
}
}
/*******************************************************************************
**
** Function avdt_scb_dealloc
**
** Description Deallocate a stream control block.
**
**
** Returns void.
**
*******************************************************************************/
void avdt_scb_dealloc(tAVDT_SCB *p_scb, tAVDT_SCB_EVT *p_data)
{
UNUSED(p_data);
AVDT_TRACE_DEBUG("avdt_scb_dealloc hdl=%d\n", avdt_scb_to_hdl(p_scb));
btu_stop_timer(&p_scb->timer_entry);
#if AVDT_MULTIPLEXING == TRUE
/* free fragments we're holding, if any; it shouldn't happen */
fixed_queue_free(p_scb->frag_q, osi_free_func);
#endif
memset(p_scb, 0, sizeof(tAVDT_SCB));
}
/*******************************************************************************
**
** Function avdt_ad_type_to_tcid
**
** Description Derives the TCID from the channel type and SCB.
**
**
** Returns TCID value.
**
*******************************************************************************/
UINT8 avdt_ad_type_to_tcid(UINT8 type, tAVDT_SCB *p_scb)
{
UINT8 scb_idx;
if (type == AVDT_CHAN_SIG) {
return 0;
} else {
scb_idx = avdt_scb_to_hdl(p_scb) - 1;
/*
AVDT_TRACE_DEBUG("type: %d, tcid: %d", type, ((scb_idx * (AVDT_CHAN_NUM_TYPES - 1)) + type));
*/
return ((scb_idx * (AVDT_CHAN_NUM_TYPES - 1)) + type);
}
}
/*******************************************************************************
**
** Function AVDT_CreateStream
**
** Description Create a stream endpoint. After a stream endpoint is
** created an application can initiate a connection between
** this endpoint and an endpoint on a peer device. In
** addition, a peer device can discover, get the capabilities,
** and connect to this endpoint.
**
**
** Returns AVDT_SUCCESS if successful, otherwise error.
**
*******************************************************************************/
UINT16 AVDT_CreateStream(UINT8 *p_handle, tAVDT_CS *p_cs)
{
UINT16 result = AVDT_SUCCESS;
tAVDT_SCB *p_scb;
/* Verify parameters; if invalid, return failure */
if (((p_cs->cfg.psc_mask & (~AVDT_PSC)) != 0) || (p_cs->p_ctrl_cback == NULL)) {
result = AVDT_BAD_PARAMS;
}
/* Allocate scb; if no scbs, return failure */
else if ((p_scb = avdt_scb_alloc(p_cs)) == NULL) {
result = AVDT_NO_RESOURCES;
} else {
*p_handle = avdt_scb_to_hdl(p_scb);
}
return result;
}
/*******************************************************************************
**
** Function avdt_scb_dealloc
**
** Description Deallocate a stream control block.
**
**
** Returns void.
**
*******************************************************************************/
void avdt_scb_dealloc(tAVDT_SCB *p_scb, tAVDT_SCB_EVT *p_data)
{
#if AVDT_MULTIPLEXING == TRUE
void *p_buf;
#endif
UNUSED(p_data);
AVDT_TRACE_DEBUG("avdt_scb_dealloc hdl=%d", avdt_scb_to_hdl(p_scb));
btu_stop_timer(&p_scb->timer_entry);
#if AVDT_MULTIPLEXING == TRUE
/* free fragments we're holding, if any; it shouldn't happen */
while ((p_buf = GKI_dequeue (&p_scb->frag_q)) != NULL)
GKI_freebuf(p_buf);
#endif
memset(p_scb, 0, sizeof(tAVDT_SCB));
}
