esp-idf/components/bt/bluedroid/bta/av/bta_av_main.c

/******************************************************************************
 *
 *  Copyright (C) 2004-2012 Broadcom Corporation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at:
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 ******************************************************************************/

/******************************************************************************
 *
 *  This is the main implementation file for the BTA advanced audio/video.
 *
 ******************************************************************************/

// #include <assert.h>
#include <string.h>

#include "common/bt_target.h"
#include "common/bt_trace.h"
#include "osi/allocator.h"

#if defined(BTA_AV_INCLUDED) && (BTA_AV_INCLUDED == TRUE)
#include "bta_av_int.h"
#include "bta/utl.h"
#include "stack/l2c_api.h"
#include "stack/l2cdefs.h"
#include "bta/bta_av_co.h"
#if( defined BTA_AR_INCLUDED ) && (BTA_AR_INCLUDED == TRUE)
#include "bta/bta_ar_api.h"
#endif
#include "osi/osi.h"

/*****************************************************************************
** Constants and types
*****************************************************************************/

/* AVDTP protocol timeout values */
#define BTIF_AVK_SERVICE_NAME "Advanced Audio Sink"

#ifndef BTA_AV_RET_TOUT
#define BTA_AV_RET_TOUT     4
#endif

#ifndef BTA_AV_SIG_TOUT
#define BTA_AV_SIG_TOUT     4
#endif

#ifndef BTA_AV_IDLE_TOUT
#define BTA_AV_IDLE_TOUT    10
#endif

/* the delay time in milliseconds to retry role switch */
#ifndef BTA_AV_RS_TIME_VAL
#define BTA_AV_RS_TIME_VAL     1000
#endif

/* state machine states */
enum {
    BTA_AV_INIT_ST,
    BTA_AV_OPEN_ST
};

/* state machine action enumeration list */
enum {
    BTA_AV_DISABLE,
    BTA_AV_RC_OPENED,
    BTA_AV_RC_REMOTE_CMD,
    BTA_AV_RC_VENDOR_CMD,
    BTA_AV_RC_VENDOR_RSP,
    BTA_AV_RC_FREE_RSP,
    BTA_AV_RC_FREE_MSG,
    BTA_AV_RC_META_RSP,
    BTA_AV_RC_MSG,
    BTA_AV_RC_CLOSE,
    BTA_AV_NUM_ACTIONS
};

#define BTA_AV_IGNORE       BTA_AV_NUM_ACTIONS

/* type for action functions */
typedef void (*tBTA_AV_ACTION)(tBTA_AV_CB *p_cb, tBTA_AV_DATA *p_data);

/* action functions */
const tBTA_AV_ACTION bta_av_action[] = {
    bta_av_disable,
    bta_av_rc_opened,
    bta_av_rc_remote_cmd,
    bta_av_rc_vendor_cmd,
    bta_av_rc_vendor_rsp,
    bta_av_rc_free_rsp,
    bta_av_rc_free_msg,
    bta_av_rc_meta_rsp,
    bta_av_rc_msg,
    bta_av_rc_close,
    NULL
};

/* state table information */
#define BTA_AV_ACTION_COL           0       /* position of actions */
#define BTA_AV_NEXT_STATE           1       /* position of next state */
#define BTA_AV_NUM_COLS             2       /* number of columns in state tables */

/* state table for init state */
static const UINT8 bta_av_st_init[][BTA_AV_NUM_COLS] = {
    /* Event                     Action 1               Next state */
    /* API_DISABLE_EVT */       {BTA_AV_DISABLE,        BTA_AV_INIT_ST },
    /* API_REMOTE_CMD_EVT */    {BTA_AV_IGNORE,         BTA_AV_INIT_ST },
    /* API_VENDOR_CMD_EVT */    {BTA_AV_IGNORE,         BTA_AV_INIT_ST },
    /* API_VENDOR_RSP_EVT */    {BTA_AV_IGNORE,         BTA_AV_INIT_ST },
    /* API_META_RSP_EVT */      {BTA_AV_RC_FREE_RSP,    BTA_AV_INIT_ST },
    /* API_RC_CLOSE_EVT */      {BTA_AV_IGNORE,         BTA_AV_INIT_ST },
    /* AVRC_OPEN_EVT */         {BTA_AV_RC_OPENED,      BTA_AV_OPEN_ST },
    /* AVRC_MSG_EVT */          {BTA_AV_RC_FREE_MSG,    BTA_AV_INIT_ST },
    /* AVRC_NONE_EVT */         {BTA_AV_IGNORE,         BTA_AV_INIT_ST },
};

/* state table for open state */
static const UINT8 bta_av_st_open[][BTA_AV_NUM_COLS] = {
    /* Event                     Action 1               Next state */
    /* API_DISABLE_EVT */       {BTA_AV_DISABLE,        BTA_AV_INIT_ST },
    /* API_REMOTE_CMD_EVT */    {BTA_AV_RC_REMOTE_CMD,  BTA_AV_OPEN_ST },
    /* API_VENDOR_CMD_EVT */    {BTA_AV_RC_VENDOR_CMD,  BTA_AV_OPEN_ST },
    /* API_VENDOR_RSP_EVT */    {BTA_AV_RC_VENDOR_RSP,  BTA_AV_OPEN_ST },
    /* API_META_RSP_EVT */      {BTA_AV_RC_META_RSP,    BTA_AV_OPEN_ST },
    /* API_RC_CLOSE_EVT */      {BTA_AV_RC_CLOSE,       BTA_AV_OPEN_ST },
    /* AVRC_OPEN_EVT */         {BTA_AV_RC_OPENED,      BTA_AV_OPEN_ST },
    /* AVRC_MSG_EVT */          {BTA_AV_RC_MSG,         BTA_AV_OPEN_ST },
    /* AVRC_NONE_EVT */         {BTA_AV_IGNORE,         BTA_AV_INIT_ST },
};

/* type for state table */
typedef const UINT8 (*tBTA_AV_ST_TBL)[BTA_AV_NUM_COLS];

/* state table */
static const tBTA_AV_ST_TBL bta_av_st_tbl[] = {
    bta_av_st_init,
    bta_av_st_open
};

typedef void (*tBTA_AV_NSM_ACT)(tBTA_AV_DATA *p_data);
static void bta_av_api_enable(tBTA_AV_DATA *p_data);
static void bta_av_api_register(tBTA_AV_DATA *p_data);
#if (BTA_AV_SINK_INCLUDED == TRUE)
static void bta_av_api_sink_enable(tBTA_AV_DATA *p_data);
#endif
static void bta_av_ci_data(tBTA_AV_DATA *p_data);
#if (AVDT_REPORTING == TRUE)
static void bta_av_rpc_conn(tBTA_AV_DATA *p_data);
#endif
static void bta_av_api_to_ssm(tBTA_AV_DATA *p_data);

static void bta_av_sco_chg_cback(tBTA_SYS_CONN_STATUS status, UINT8 id, UINT8
                                 app_id, BD_ADDR peer_addr);
static void bta_av_sys_rs_cback (tBTA_SYS_CONN_STATUS status, UINT8 id, UINT8 app_id, BD_ADDR peer_addr);


/* action functions */
const tBTA_AV_NSM_ACT bta_av_nsm_act[] = {
    bta_av_api_enable,      /* BTA_AV_API_ENABLE_EVT */
    bta_av_api_register,    /* BTA_AV_API_REGISTER_EVT */
    bta_av_api_deregister,  /* BTA_AV_API_DEREGISTER_EVT */
    bta_av_api_disconnect,  /* BTA_AV_API_DISCONNECT_EVT */
    bta_av_ci_data,         /* BTA_AV_CI_SRC_DATA_READY_EVT */
    bta_av_sig_chg,         /* BTA_AV_SIG_CHG_EVT */
    bta_av_sig_timer,       /* BTA_AV_SIG_TIMER_EVT */
    bta_av_rc_disc_done,    /* BTA_AV_SDP_AVRC_DISC_EVT */
    bta_av_rc_closed,       /* BTA_AV_AVRC_CLOSE_EVT */
    bta_av_conn_chg,        /* BTA_AV_CONN_CHG_EVT */
    bta_av_dereg_comp,      /* BTA_AV_DEREG_COMP_EVT */
#if (BTA_AV_SINK_INCLUDED == TRUE)
    bta_av_api_sink_enable, /* BTA_AV_API_SINK_ENABLE_EVT */
#endif
#if (AVDT_REPORTING == TRUE)
    bta_av_rpc_conn,        /* BTA_AV_AVDT_RPT_CONN_EVT */
#endif
    bta_av_api_to_ssm,      /* BTA_AV_API_START_EVT */
    bta_av_api_to_ssm,      /* BTA_AV_API_STOP_EVT */
};

/*****************************************************************************
** Global data
*****************************************************************************/

/* AV control block */
#if BTA_DYNAMIC_MEMORY == FALSE
tBTA_AV_CB  bta_av_cb;
#else
tBTA_AV_CB  *bta_av_cb_ptr;
#endif

#if (defined(BTA_AV_DEBUG) && BTA_AV_DEBUG == TRUE)
static char *bta_av_st_code(UINT8 state);
#endif

/*******************************************************************************
**
** Function         bta_av_timer_cback
**
** Description      forward the event to stream state machine
**
** Returns          void
**
*******************************************************************************/
static void bta_av_timer_cback(void *p_tle)
{
    BT_HDR          *p_buf;
    TIMER_LIST_ENT  *p = (TIMER_LIST_ENT *)p_tle;
    int xx;
    tBTA_AV_SCB *p_scb = NULL;

    /* find the SCB that has the timer */
    for (xx = 0; xx < BTA_AV_NUM_STRS; xx++) {
        if (bta_av_cb.p_scb[xx] && &(bta_av_cb.p_scb[xx]->timer) == p) {
            p_scb = bta_av_cb.p_scb[xx];
            break;
        }
    }

    if (p_scb && (p_buf = (BT_HDR *) osi_malloc(sizeof(BT_HDR))) != NULL) {
        /* send the event through the audio state machine.
         * only when the audio SM is open, the main SM opens the RC connection as INT */
        p_buf->event = p->event;
        p_buf->layer_specific = p_scb->hndl;
        bta_sys_sendmsg(p_buf);
    }
}

/*******************************************************************************
**
** Function         bta_av_api_enable
**
** Description      Handle an API enable event.
**
**
** Returns          void
**
*******************************************************************************/
static void bta_av_api_enable(tBTA_AV_DATA *p_data)
{
    int i;
    tBTA_AV_ENABLE      enable;

    /* initialize control block */
    memset(&bta_av_cb, 0, sizeof(tBTA_AV_CB));

    for (i = 0; i < BTA_AV_NUM_RCB; i++) {
        bta_av_cb.rcb[i].handle = BTA_AV_RC_HANDLE_NONE;
    }

    bta_av_cb.rc_acp_handle = BTA_AV_RC_HANDLE_NONE;

    /* store parameters */
    bta_av_cb.p_cback  = p_data->api_enable.p_cback;
    bta_av_cb.features = p_data->api_enable.features;
    bta_av_cb.sec_mask = p_data->api_enable.sec_mask;

    enable.features = bta_av_cb.features;

    /* Register for SCO change event */
    if (!(bta_av_cb.features & BTA_AV_FEAT_NO_SCO_SSPD)) {
        bta_sys_sco_register(bta_av_sco_chg_cback);
    }

    /* call callback with enable event */
    (*bta_av_cb.p_cback)(BTA_AV_ENABLE_EVT, (tBTA_AV *)&enable);
}

/*******************************************************************************
**
** Function         bta_av_addr_to_scb
**
** Description      find the stream control block by the peer addr
**
** Returns          void
**
*******************************************************************************/
static tBTA_AV_SCB *bta_av_addr_to_scb(BD_ADDR bd_addr)
{
    tBTA_AV_SCB *p_scb = NULL;
    int         xx;

    for (xx = 0; xx < BTA_AV_NUM_STRS; xx++) {
        if (bta_av_cb.p_scb[xx]) {
            if (!bdcmp(bd_addr, bta_av_cb.p_scb[xx]->peer_addr)) {
                p_scb = bta_av_cb.p_scb[xx];
                break;
            }
        }
    }
    return p_scb;
}

/*******************************************************************************
**
** Function         bta_av_hndl_to_scb
**
** Description      find the stream control block by the handle
**
** Returns          void
**
*******************************************************************************/
tBTA_AV_SCB *bta_av_hndl_to_scb(UINT16 handle)
{
    tBTA_AV_HNDL hndl = (tBTA_AV_HNDL)handle;
    tBTA_AV_SCB *p_scb = NULL;
    UINT8 idx = (hndl & BTA_AV_HNDL_MSK);

    if (idx && (idx <= BTA_AV_NUM_STRS) ) {
        p_scb = bta_av_cb.p_scb[idx - 1];
    }
    return p_scb;
}

/*******************************************************************************
**
** Function         bta_av_alloc_scb
**
** Description      allocate stream control block,
**                  register the service to stack
**                  create SDP record
**
** Returns          void
**
*******************************************************************************/
static tBTA_AV_SCB *bta_av_alloc_scb(tBTA_AV_CHNL chnl)
{
    tBTA_AV_SCB *p_ret = NULL;
    int         xx;
    tBTA_AV_STATUS sts = BTA_AV_SUCCESS;

    if (chnl == BTA_AV_CHNL_VIDEO) {
        if (p_bta_av_cfg->p_act_tbl == NULL || p_bta_av_cfg->p_reg == NULL) {
            APPL_TRACE_ERROR("Video streaming not supported");
            sts = BTA_AV_FAIL;
        } else {
            /* allow only one Video channel */
            if (bta_av_cb.reg_video) {
                APPL_TRACE_ERROR("Already registered");
                sts = BTA_AV_FAIL;
            }
        }
    } else if (chnl != BTA_AV_CHNL_AUDIO) {
        APPL_TRACE_ERROR("bad channel: %d\n", chnl);
        sts = BTA_AV_FAIL;
    }

    if (sts == BTA_AV_SUCCESS) {
        for (xx = 0; xx < BTA_AV_NUM_STRS; xx++) {
            if (bta_av_cb.p_scb[xx] == NULL) {
                /* found an empty spot */
                p_ret = (tBTA_AV_SCB *)osi_malloc(sizeof(tBTA_AV_SCB));
                if (p_ret) {
                    memset(p_ret, 0, sizeof(tBTA_AV_SCB));
                    p_ret->rc_handle = BTA_AV_RC_HANDLE_NONE;
                    p_ret->chnl = chnl;
                    p_ret->hndl = (tBTA_AV_HNDL)((xx + 1) | chnl);
                    p_ret->hdi  = xx;
                    p_ret->a2d_list = list_new(NULL);
                    bta_av_cb.p_scb[xx] = p_ret;
                }
                break;
            }
        }
    }
    return p_ret;
}

/*******************************************************************************
**
** Function         bta_av_free_scb
**
** Description      free stream control block,
**
**
** Returns          void
**
*******************************************************************************/
UNUSED_ATTR static void bta_av_free_scb(tBTA_AV_SCB *p_scb)
{
    // NOTE(google) This free currently is not called
    assert(p_scb != NULL);

    list_free(p_scb->a2d_list);
    osi_free(p_scb);
}

/*******************************************************************************
*******************************************************************************/
void bta_av_conn_cback(UINT8 handle, BD_ADDR bd_addr, UINT8 event, tAVDT_CTRL *p_data)
{
    tBTA_AV_STR_MSG     *p_msg;
    UINT16  evt = 0;
    tBTA_AV_SCB *p_scb = NULL;
    UNUSED(handle);

#if( defined BTA_AR_INCLUDED ) && (BTA_AR_INCLUDED == TRUE)
    if (event == BTA_AR_AVDT_CONN_EVT ||
            event == AVDT_CONNECT_IND_EVT || event == AVDT_DISCONNECT_IND_EVT)
#else
    if (event == AVDT_CONNECT_IND_EVT || event == AVDT_DISCONNECT_IND_EVT)
#endif
    {
        evt = BTA_AV_SIG_CHG_EVT;
        if (AVDT_DISCONNECT_IND_EVT == event) {
            p_scb = bta_av_addr_to_scb(bd_addr);
        }
#if (defined(BTA_AV_DEBUG) && BTA_AV_DEBUG == TRUE)
        else if (AVDT_CONNECT_IND_EVT == event) {
            APPL_TRACE_DEBUG("CONN_IND is ACP:%d\n", p_data->hdr.err_param);
        }
#endif

        if (/*((p_scb && (p_scb->role & BTA_AV_ROLE_AD_ACP)) ||

            //(AVDT_CONNECT_IND_EVT == event && AVDT_ACP == p_data->hdr.err_param))

            (AVDT_CONNECT_IND_EVT == event))&& */
            (p_msg = (tBTA_AV_STR_MSG *) osi_malloc((UINT16) (sizeof(tBTA_AV_STR_MSG)))) != NULL) {
            p_msg->hdr.event = evt;
            p_msg->hdr.layer_specific = event;
            p_msg->hdr.offset = p_data->hdr.err_param;
            bdcpy(p_msg->bd_addr, bd_addr);
#if (defined(BTA_AV_DEBUG) && BTA_AV_DEBUG == TRUE)
            if (p_scb) {
                APPL_TRACE_DEBUG("scb hndl x%x, role x%x\n", p_scb->hndl, p_scb->role);
            }
#endif
            APPL_TRACE_DEBUG("conn_cback bd_addr:%02x-%02x-%02x-%02x-%02x-%02x\n",
                             bd_addr[0], bd_addr[1],
                             bd_addr[2], bd_addr[3],
                             bd_addr[4], bd_addr[5]);
            bta_sys_sendmsg(p_msg);
        }
    }

}

#if AVDT_REPORTING == TRUE
/*******************************************************************************
**
** Function         bta_av_a2dp_report_cback
**
** Description      A2DP report callback.
**
** Returns          void
**
*******************************************************************************/
static void bta_av_a2dp_report_cback(UINT8 handle, AVDT_REPORT_TYPE type,
                                     tAVDT_REPORT_DATA *p_data)
{
    UNUSED(handle);
    UNUSED(type);
    UNUSED(p_data);
    /* Do not need to handle report data for now.
     * This empty function is here for conformance reasons. */
}
#endif

#if (BTA_AV_SINK_INCLUDED == TRUE)
/*******************************************************************************
**
** Function         bta_av_api_sink_enable
**
** Description      activate, deactive A2DP Sink,
**
** Returns          void
**
*******************************************************************************/

static void bta_av_api_sink_enable(tBTA_AV_DATA *p_data)
{
    UINT16 activate_sink = 0;
    activate_sink = p_data->hdr.layer_specific;
    APPL_TRACE_DEBUG("bta_av_api_sink_enable %d \n", activate_sink)
    char p_service_name[BTA_SERVICE_NAME_LEN + 1];
    BCM_STRNCPY_S(p_service_name, sizeof(p_service_name),
                  BTIF_AVK_SERVICE_NAME, BTA_SERVICE_NAME_LEN);

    if (activate_sink) {
        AVDT_SINK_Activate();
        if (bta_av_cb.sdp_a2d_snk_handle == 0) {
            bta_av_cb.sdp_a2d_snk_handle = SDP_CreateRecord();
            A2D_AddRecord(UUID_SERVCLASS_AUDIO_SINK, p_service_name, NULL,
                          A2D_SUPF_PLAYER, bta_av_cb.sdp_a2d_snk_handle);
            bta_sys_add_uuid(UUID_SERVCLASS_AUDIO_SINK);
        }
    } else {
        AVDT_SINK_Deactivate();
        if (bta_av_cb.sdp_a2d_snk_handle != 0) {
            SDP_DeleteRecord(bta_av_cb.sdp_a2d_snk_handle);
            bta_av_cb.sdp_a2d_snk_handle = 0;
            bta_sys_remove_uuid(UUID_SERVCLASS_AUDIO_SINK);
        }
    }
}
#endif
/*******************************************************************************
**
** Function         bta_av_api_register
**
** Description      allocate stream control block,
**                  register the service to stack
**                  create SDP record
**
** Returns          void
**
*******************************************************************************/
static void bta_av_api_register(tBTA_AV_DATA *p_data)
{
    tBTA_AV_REGISTER    registr;
    tBTA_AV_SCB         *p_scb;    /* stream control block */
    tAVDT_REG       reg;
    tAVDT_CS        cs;
    char            *p_service_name;
    tBTA_AV_CODEC   codec_type;
    tBTA_UTL_COD    cod;
    UINT8           index = 0;
    char p_avk_service_name[BTA_SERVICE_NAME_LEN + 1];
    BCM_STRNCPY_S(p_avk_service_name, sizeof(p_avk_service_name), BTIF_AVK_SERVICE_NAME, BTA_SERVICE_NAME_LEN);

    memset(&cs, 0, sizeof(tAVDT_CS));

    registr.status = BTA_AV_FAIL_RESOURCES;
    registr.app_id = p_data->api_reg.app_id;
    registr.chnl   = (tBTA_AV_CHNL)p_data->hdr.layer_specific;
    registr.p_bta_av_cos = p_data->api_reg.bta_av_cos;
    do {
        p_scb = bta_av_alloc_scb(registr.chnl);
        if (p_scb == NULL) {
            APPL_TRACE_ERROR("failed to alloc SCB");
            break;
        }

        registr.hndl    = p_scb->hndl;
        p_scb->app_id   = registr.app_id;

        /* initialize the stream control block */
        p_scb->timer.p_cback = (TIMER_CBACK *)&bta_av_timer_cback;
        registr.status = BTA_AV_SUCCESS;

        if ((bta_av_cb.reg_audio + bta_av_cb.reg_video) == 0) {
            /* the first channel registered. register to AVDTP */
            reg.ctrl_mtu = p_bta_av_cfg->sig_mtu;
            reg.ret_tout = BTA_AV_RET_TOUT;
            reg.sig_tout = BTA_AV_SIG_TOUT;
            reg.idle_tout = BTA_AV_IDLE_TOUT;
            reg.sec_mask = bta_av_cb.sec_mask;
#if( defined BTA_AR_INCLUDED ) && (BTA_AR_INCLUDED == TRUE)
            bta_ar_reg_avdt(&reg, bta_av_conn_cback, BTA_ID_AV);
#endif
            bta_sys_role_chg_register(&bta_av_sys_rs_cback);

            /* create remote control TG service if required */
            if (bta_av_cb.features & (BTA_AV_FEAT_RCTG)) {
                /* register with no authorization; let AVDTP use authorization instead */
#if( defined BTA_AR_INCLUDED ) && (BTA_AR_INCLUDED == TRUE)
#if (BTA_AV_WITH_AVCTP_AUTHORIZATION == TRUE)
                bta_ar_reg_avct(p_bta_av_cfg->avrc_mtu, p_bta_av_cfg->avrc_br_mtu,
                                bta_av_cb.sec_mask, BTA_ID_AV);
#else
                bta_ar_reg_avct(p_bta_av_cfg->avrc_mtu, p_bta_av_cfg->avrc_br_mtu,
                                (UINT8)(bta_av_cb.sec_mask & (~BTA_SEC_AUTHORIZE)), BTA_ID_AV);
#endif

                bta_ar_reg_avrc(UUID_SERVCLASS_AV_REM_CTRL_TARGET, "AV Remote Control Target\n", NULL,
                                p_bta_av_cfg->avrc_tg_cat, BTA_ID_AV);
#endif
            }

            /* Set the Calss of Device (Audio & Capturing/Rendering service class bit) */
            if (p_data->api_reg.tsep == AVDT_TSEP_SRC) {
                cod.service = BTM_COD_SERVICE_CAPTURING | BTM_COD_SERVICE_AUDIO;
                cod.major = BTM_COD_MAJOR_AUDIO;
                cod.minor = BTM_COD_MINOR_UNCLASSIFIED;
            } else {
#if (BTA_AV_SINK_INCLUDED == TRUE)
                cod.service = BTM_COD_SERVICE_RENDERING | BTM_COD_SERVICE_AUDIO;
                cod.major = BTM_COD_MAJOR_AUDIO;
                cod.minor = BTM_COD_MINOR_LOUDSPEAKER;
#endif
            }
            utl_set_device_class(&cod, BTA_UTL_SET_COD_ALL);
        } /* if 1st channel */

        /* get stream configuration and create stream */
        /* memset(&cs.cfg,0,sizeof(tAVDT_CFG)); */
        cs.cfg.num_codec = 1;
        cs.tsep = p_data->api_reg.tsep;

        /*
         * memset of cs takes care setting call back pointers to null.
        cs.p_data_cback = NULL;
        cs.p_report_cback = NULL;
        */
        cs.nsc_mask = AVDT_NSC_RECONFIG |
                      ((bta_av_cb.features & BTA_AV_FEAT_PROTECT) ? 0 : AVDT_NSC_SECURITY);
        APPL_TRACE_DEBUG("nsc_mask: 0x%x\n", cs.nsc_mask);

        if (p_data->api_reg.p_service_name[0] == 0) {
            p_service_name = NULL;
        } else {
            p_service_name = p_data->api_reg.p_service_name;
        }

        p_scb->suspend_sup  = TRUE;
        p_scb->recfg_sup    = TRUE;

        cs.p_ctrl_cback  = bta_av_dt_cback[p_scb->hdi];
        if (registr.chnl == BTA_AV_CHNL_AUDIO) {
            /* set up the audio stream control block */
            p_scb->p_act_tbl = (const tBTA_AV_ACT *)bta_av_a2d_action;
            // p_scb->p_cos     = &bta_av_a2d_cos;
            p_scb->p_cos     = registr.p_bta_av_cos;
            p_scb->media_type = AVDT_MEDIA_AUDIO;
            cs.cfg.psc_mask  = AVDT_PSC_TRANS;
            cs.media_type    = AVDT_MEDIA_AUDIO;
            cs.mtu           = p_bta_av_cfg->audio_mtu;
            cs.flush_to      = L2CAP_DEFAULT_FLUSH_TO;
#if AVDT_REPORTING == TRUE
            if (bta_av_cb.features & BTA_AV_FEAT_REPORT) {
                cs.cfg.psc_mask |= AVDT_PSC_REPORT;
                cs.p_report_cback = bta_av_a2dp_report_cback;
#if AVDT_MULTIPLEXING == TRUE
                cs.cfg.mux_tsid_report = 2;
#endif
            }
#endif
            if (bta_av_cb.features & BTA_AV_FEAT_DELAY_RPT) {
                cs.cfg.psc_mask |= AVDT_PSC_DELAY_RPT;
            }

            /* keep the configuration in the stream control block */
            memcpy(&p_scb->cfg, &cs.cfg, sizeof(tAVDT_CFG));
            while (index < BTA_AV_MAX_SEPS &&
                    (p_scb->p_cos->init)(&codec_type, cs.cfg.codec_info,
                                         &cs.cfg.num_protect, cs.cfg.protect_info, p_data->api_reg.tsep) == TRUE) {

#if (BTA_AV_SINK_INCLUDED == TRUE)
                if (p_data->api_reg.tsep == AVDT_TSEP_SNK) {
                    cs.p_data_cback = bta_av_stream_data_cback;
                }
                APPL_TRACE_DEBUG(" SEP Type = %d\n", cs.tsep);
#endif
                if (AVDT_CreateStream(&p_scb->seps[index].av_handle, &cs) == AVDT_SUCCESS) {
                    p_scb->seps[index].codec_type = codec_type;

#if (BTA_AV_SINK_INCLUDED == TRUE)
                    p_scb->seps[index].tsep = cs.tsep;
                    if (cs.tsep == AVDT_TSEP_SNK) {
                        p_scb->seps[index].p_app_data_cback = p_data->api_reg.p_app_data_cback;
                    } else {
                        p_scb->seps[index].p_app_data_cback = NULL;    /* In case of A2DP SOURCE we don't need a callback to handle media packets */
                    }
#endif

                    APPL_TRACE_DEBUG("audio[%d] av_handle: %d codec_type: %d\n",
                                     index, p_scb->seps[index].av_handle, p_scb->seps[index].codec_type);
                    index++;
                } else {
                    break;
                }
            }

            if (!bta_av_cb.reg_audio) {
                if (p_data->api_reg.tsep == AVDT_TSEP_SRC) {
                    /* create the SDP records on the 1st audio channel */
                    bta_av_cb.sdp_a2d_handle = SDP_CreateRecord();
                    A2D_AddRecord(UUID_SERVCLASS_AUDIO_SOURCE, p_service_name, NULL,
                                  A2D_SUPF_PLAYER, bta_av_cb.sdp_a2d_handle);
                    bta_sys_add_uuid(UUID_SERVCLASS_AUDIO_SOURCE);
                } else {
#if (BTA_AV_SINK_INCLUDED == TRUE)
                    bta_av_cb.sdp_a2d_snk_handle = SDP_CreateRecord();
                    A2D_AddRecord(UUID_SERVCLASS_AUDIO_SINK, p_avk_service_name, NULL,
                                  A2D_SUPF_PLAYER, bta_av_cb.sdp_a2d_snk_handle);
                    bta_sys_add_uuid(UUID_SERVCLASS_AUDIO_SINK);
#endif
                }
                /* start listening when A2DP is registered */
                if (bta_av_cb.features & BTA_AV_FEAT_RCTG) {
                    bta_av_rc_create(&bta_av_cb, AVCT_ACP, 0, BTA_AV_NUM_LINKS + 1);
                }

                /* if the AV and AVK are both supported, it cannot support the CT role */
                if (bta_av_cb.features & (BTA_AV_FEAT_RCCT)) {
                    /* if TG is not supported, we need to register to AVCT now */
                    if ((bta_av_cb.features & (BTA_AV_FEAT_RCTG)) == 0) {
#if( defined BTA_AR_INCLUDED ) && (BTA_AR_INCLUDED == TRUE)
#if (BTA_AV_WITH_AVCTP_AUTHORIZATION == TRUE)
                        bta_ar_reg_avct(p_bta_av_cfg->avrc_mtu, p_bta_av_cfg->avrc_br_mtu,
                                        bta_av_cb.sec_mask, BTA_ID_AV);
#else
                        bta_ar_reg_avct(p_bta_av_cfg->avrc_mtu, p_bta_av_cfg->avrc_br_mtu,
                                        (UINT8)(bta_av_cb.sec_mask & (~BTA_SEC_AUTHORIZE)), BTA_ID_AV);
#endif
#endif
                    }
#if( defined BTA_AR_INCLUDED ) && (BTA_AR_INCLUDED == TRUE)
                    /* create an SDP record as AVRC CT. */
                    bta_ar_reg_avrc(UUID_SERVCLASS_AV_REMOTE_CONTROL, NULL, NULL,
                                    p_bta_av_cfg->avrc_ct_cat, BTA_ID_AV);
#endif
                }
            }
            bta_av_cb.reg_audio |= BTA_AV_HNDL_TO_MSK(p_scb->hdi);
            APPL_TRACE_DEBUG("reg_audio: 0x%x\n", bta_av_cb.reg_audio);
        } else {
            bta_av_cb.reg_video = BTA_AV_HNDL_TO_MSK(p_scb->hdi);
            bta_av_cb.sdp_vdp_handle = SDP_CreateRecord();
            /* register the video channel */
            /* no need to verify the function pointer here. it's verified prior */
            (*p_bta_av_cfg->p_reg)(&cs, p_service_name, p_scb);
        }
    } while (0);

    /* call callback with register event */
    (*bta_av_cb.p_cback)(BTA_AV_REGISTER_EVT, (tBTA_AV *)&registr);
}

/*******************************************************************************
**
** Function         bta_av_api_deregister
**
** Description      de-register a channel
**
**
** Returns          void
**
*******************************************************************************/
void bta_av_api_deregister(tBTA_AV_DATA *p_data)
{
    tBTA_AV_SCB *p_scb = bta_av_hndl_to_scb(p_data->hdr.layer_specific);

    if (p_scb) {
        p_scb->deregistring = TRUE;
        bta_av_ssm_execute(p_scb, BTA_AV_API_CLOSE_EVT, p_data);
    } else {
        bta_av_dereg_comp(p_data);
    }
}

/*******************************************************************************
**
** Function         bta_av_ci_data
**
** Description      forward the BTA_AV_CI_SRC_DATA_READY_EVT to stream state machine
**
**
** Returns          void
**
*******************************************************************************/
static void bta_av_ci_data(tBTA_AV_DATA *p_data)
{
    tBTA_AV_SCB *p_scb;
    int     i;
    UINT8   chnl = (UINT8)p_data->hdr.layer_specific;

    for ( i = 0; i < BTA_AV_NUM_STRS; i++ ) {
        p_scb = bta_av_cb.p_scb[i];

        if (p_scb && p_scb->chnl == chnl) {
            bta_av_ssm_execute(p_scb, BTA_AV_SRC_DATA_READY_EVT, p_data);
        }
    }
}

/*******************************************************************************
**
** Function         bta_av_rpc_conn
**
** Description      report report channel open
**
** Returns          void
**
*******************************************************************************/
#if (AVDT_REPORTING == TRUE)
static void bta_av_rpc_conn(tBTA_AV_DATA *p_data)
{
    UNUSED(p_data);
}
#endif

/*******************************************************************************
**
** Function         bta_av_api_to_ssm
**
** Description      forward the API request to stream state machine
**
**
** Returns          void
**
*******************************************************************************/
static void bta_av_api_to_ssm(tBTA_AV_DATA *p_data)
{
    int xx;
    UINT16 event = p_data->hdr.event - BTA_AV_FIRST_A2S_API_EVT + BTA_AV_FIRST_A2S_SSM_EVT;

    for (xx = 0; xx < BTA_AV_NUM_STRS; xx++) {
        bta_av_ssm_execute(bta_av_cb.p_scb[xx], event, p_data);
    }
}

/*******************************************************************************
**
** Function         bta_av_chk_start
**
** Description      if this is audio channel, check if more than one audio
**                  channel is connected & already started.
**
** Returns          TRUE, if need api_start
**
*******************************************************************************/
BOOLEAN bta_av_chk_start(tBTA_AV_SCB *p_scb)
{
    BOOLEAN start = FALSE;
    tBTA_AV_SCB *p_scbi;
    int i;

    if (p_scb->chnl == BTA_AV_CHNL_AUDIO) {
        if ((bta_av_cb.audio_open_cnt >= 2) &&
                ((0 == (p_scb->role & BTA_AV_ROLE_AD_ACP)) ||       /* Outgoing connection or   */
                 (bta_av_cb.features & BTA_AV_FEAT_ACP_START))) {   /* auto-starting option     */
            /* more than one audio channel is connected */
            /* if this is the 2nd stream as ACP, give INT a chance to issue the START command */
            for (i = 0; i < BTA_AV_NUM_STRS; i++) {
                p_scbi = bta_av_cb.p_scb[i];
                if (p_scbi && p_scbi->chnl == BTA_AV_CHNL_AUDIO && p_scbi->co_started) {
                    start = TRUE;
                    /* may need to update the flush timeout of this already started stream */
                    if (p_scbi->co_started != bta_av_cb.audio_open_cnt) {
                        p_scbi->co_started = bta_av_cb.audio_open_cnt;
                        L2CA_SetFlushTimeout(p_scbi->peer_addr, p_bta_av_cfg->p_audio_flush_to[p_scbi->co_started - 1] );
                    }
                }
            }
        }
    }
    return start;
}

/*******************************************************************************
**
** Function         bta_av_restore_switch
**
** Description      assume that the caller of this function already makes
**                  sure that there's only one ACL connection left
**
** Returns          void
**
*******************************************************************************/
void bta_av_restore_switch (void)
{
    tBTA_AV_CB   *p_cb = &bta_av_cb;
    int     i;
    UINT8   mask;

    APPL_TRACE_DEBUG("reg_audio: 0x%x\n", bta_av_cb.reg_audio);
    for (i = 0; i < BTA_AV_NUM_STRS; i++) {
        mask = BTA_AV_HNDL_TO_MSK(i);
        if (p_cb->conn_audio == mask) {
            if (p_cb->p_scb[i]) {
                bta_sys_set_policy(BTA_ID_AV, HCI_ENABLE_MASTER_SLAVE_SWITCH, p_cb->p_scb[i]->peer_addr);
            }
            break;
        }
    }
}

/*******************************************************************************
**
** Function         bta_av_sys_rs_cback
**
** Description      Receives the role change event from dm
**
** Returns          (BTA_SYS_ROLE_CHANGE, new_role, hci_status, p_bda)
**
*******************************************************************************/
static void bta_av_sys_rs_cback (tBTA_SYS_CONN_STATUS status, UINT8 id, UINT8 app_id, BD_ADDR peer_addr)
{
    int         i;
    tBTA_AV_SCB *p_scb = NULL;
    tBTA_AV_ROLE_RES  *p_buf;
    UINT8       cur_role;
    UINT8       peer_idx = 0;
    UNUSED(status);

    APPL_TRACE_DEBUG("bta_av_sys_rs_cback: %d\n", bta_av_cb.rs_idx);
    for (i = 0; i < BTA_AV_NUM_STRS; i++) {
        /* loop through all the SCBs to find matching peer addresses and report the role change event */
        /* note that more than one SCB (a2dp & vdp) maybe waiting for this event */
        p_scb = bta_av_cb.p_scb[i];
        if (p_scb && (bdcmp (peer_addr, p_scb->peer_addr) == 0) &&
                (p_buf = (tBTA_AV_ROLE_RES *) osi_malloc(sizeof(tBTA_AV_ROLE_RES))) != NULL) {
            APPL_TRACE_DEBUG("new_role:%d, hci_status:x%x hndl: x%x\n", id, app_id, p_scb->hndl);
            /*
            if ((id != BTM_ROLE_MASTER) && (app_id != HCI_SUCCESS))
            {
                bta_sys_set_policy(BTA_ID_AV, (HCI_ENABLE_MASTER_SLAVE_SWITCH|HCI_ENABLE_SNIFF_MODE), p_scb->peer_addr);
            }
            */
            p_buf->hdr.event = BTA_AV_ROLE_CHANGE_EVT;
            p_buf->hdr.layer_specific = p_scb->hndl;
            p_buf->new_role = id;
            p_buf->hci_status = app_id;
            bta_sys_sendmsg(p_buf);

            peer_idx = p_scb->hdi + 1;  /* Handle index for the peer_addr */
        }
    }

    /* restore role switch policy, if role switch failed */
    if ((HCI_SUCCESS != app_id) &&
            (BTM_GetRole (peer_addr, &cur_role) == BTM_SUCCESS) &&
            (cur_role == BTM_ROLE_SLAVE) ) {
        bta_sys_set_policy(BTA_ID_AV, HCI_ENABLE_MASTER_SLAVE_SWITCH, peer_addr);
    }

    /* if BTA_AvOpen() was called for other device, which caused the role switch of the peer_addr,  */
    /* we need to continue opening process for the BTA_AvOpen().                                    */
    if ((bta_av_cb.rs_idx != 0) && (bta_av_cb.rs_idx != peer_idx)) {
        if ((bta_av_cb.rs_idx - 1) < BTA_AV_NUM_STRS) {
            p_scb = bta_av_cb.p_scb[bta_av_cb.rs_idx - 1];
        }
        if (p_scb && p_scb->q_tag == BTA_AV_Q_TAG_OPEN) {
            APPL_TRACE_DEBUG ("bta_av_sys_rs_cback: rs_idx(%d), hndl:x%x q_tag: %d\n",
                              bta_av_cb.rs_idx, p_scb->hndl, p_scb->q_tag);

            if (HCI_SUCCESS == app_id || HCI_ERR_NO_CONNECTION == app_id) {
                p_scb->q_info.open.switch_res = BTA_AV_RS_OK;
            } else {
                p_scb->q_info.open.switch_res = BTA_AV_RS_FAIL;
            }

            /* Continue av open process */
            bta_av_do_disc_a2d (p_scb, (tBTA_AV_DATA *) & (p_scb->q_info.open));
        }

        bta_av_cb.rs_idx = 0;
    }
}

/*******************************************************************************
**
** Function         bta_av_sco_chg_cback
**
** Description      receive & process the SCO connection up/down event from sys.
**                  call setup also triggers this callback, to suspend av before sco
**                  activity happens, or to resume av once call ends.
**
** Returns          void
**
*******************************************************************************/
static void bta_av_sco_chg_cback(tBTA_SYS_CONN_STATUS status, UINT8 id, UINT8
                                 app_id, BD_ADDR peer_addr)
{
    tBTA_AV_SCB *p_scb;
    int     i;
    tBTA_AV_API_STOP stop;
    UNUSED(app_id);
    UNUSED(peer_addr);

    APPL_TRACE_DEBUG("bta_av_sco_chg_cback:%d status:%d\n", id, status);
    if (id) {
        bta_av_cb.sco_occupied = TRUE;

        /* either BTA_SYS_SCO_OPEN or BTA_SYS_SCO_CLOSE with remaining active SCO */
        for (i = 0; i < BTA_AV_NUM_STRS; i++) {
            p_scb = bta_av_cb.p_scb[i];

            if ( p_scb && p_scb->co_started && (p_scb->sco_suspend == FALSE)) {
                APPL_TRACE_DEBUG("suspending scb:%d\n", i);
                /* scb is used and started, not suspended automatically */
                p_scb->sco_suspend = TRUE;
                stop.flush   = FALSE;
                stop.suspend = TRUE;
                bta_av_ssm_execute(p_scb, BTA_AV_AP_STOP_EVT, (tBTA_AV_DATA *)&stop);
            }
        }
    } else {
        bta_av_cb.sco_occupied = FALSE;

        for (i = 0; i < BTA_AV_NUM_STRS; i++) {
            p_scb = bta_av_cb.p_scb[i];

            if ( p_scb && p_scb->sco_suspend ) { /* scb is used and suspended for SCO */
                APPL_TRACE_DEBUG("starting scb:%d\n", i);
                bta_av_ssm_execute(p_scb, BTA_AV_AP_START_EVT, NULL);
            }
        }
    }
}

/*******************************************************************************
**
** Function         bta_av_switch_if_needed
**
** Description      This function checks if there is another existing AV
**                  channel that is local as slave role.
**                  If so, role switch and remove it from link policy.
**
** Returns          TRUE, if role switch is done
**
*******************************************************************************/
BOOLEAN bta_av_switch_if_needed(tBTA_AV_SCB *p_scb)
{
    UINT8 role;
    BOOLEAN needed = FALSE;
    tBTA_AV_SCB *p_scbi;
    int i;
    UINT8       mask;

    for (i = 0; i < BTA_AV_NUM_STRS; i++) {
        mask = BTA_AV_HNDL_TO_MSK(i);
        p_scbi = bta_av_cb.p_scb[i];
        if ( p_scbi && (p_scb->hdi != i) && /* not the original channel */
                ((bta_av_cb.conn_audio & mask) ||/* connected audio */
                 (bta_av_cb.conn_video & mask)) ) { /* connected video */
            BTM_GetRole(p_scbi->peer_addr, &role);
            /* this channel is open - clear the role switch link policy for this link */
            if (BTM_ROLE_MASTER != role) {
                if (bta_av_cb.features & BTA_AV_FEAT_MASTER) {
                    bta_sys_clear_policy(BTA_ID_AV, HCI_ENABLE_MASTER_SLAVE_SWITCH, p_scbi->peer_addr);
                }
                if (BTM_CMD_STARTED != BTM_SwitchRole(p_scbi->peer_addr, BTM_ROLE_MASTER, NULL)) {
                    /* can not switch role on SCBI
                     * start the timer on SCB - because this function is ONLY called when SCB gets API_OPEN */
                    bta_sys_start_timer(&p_scb->timer, BTA_AV_AVRC_TIMER_EVT, BTA_AV_RS_TIME_VAL);
                }
                needed = TRUE;
                /* mark the original channel as waiting for RS result */
                bta_av_cb.rs_idx = p_scb->hdi + 1;
                break;
            }
        }
    }
    return needed;
}

/*******************************************************************************
**
** Function         bta_av_link_role_ok
**
** Description      This function checks if the SCB has existing ACL connection
**                  If so, check if the link role fits the requirements.
**
** Returns          TRUE, if role is ok
**
*******************************************************************************/
BOOLEAN bta_av_link_role_ok(tBTA_AV_SCB *p_scb, UINT8 bits)
{
    UINT8 role;
    BOOLEAN is_ok = TRUE;

    if (BTM_GetRole(p_scb->peer_addr, &role) == BTM_SUCCESS) {
        LOG_INFO("%s hndl:x%x role:%d conn_audio:x%x bits:%d features:x%x\n",
                 __func__, p_scb->hndl, role, bta_av_cb.conn_audio, bits,
                 bta_av_cb.features);
        if (BTM_ROLE_MASTER != role && (A2D_BitsSet(bta_av_cb.conn_audio) > bits || (bta_av_cb.features & BTA_AV_FEAT_MASTER))) {
            if (bta_av_cb.features & BTA_AV_FEAT_MASTER) {
                bta_sys_clear_policy(BTA_ID_AV, HCI_ENABLE_MASTER_SLAVE_SWITCH, p_scb->peer_addr);
            }

            if (BTM_CMD_STARTED != BTM_SwitchRole(p_scb->peer_addr, BTM_ROLE_MASTER, NULL)) {
                /* can not switch role on SCB - start the timer on SCB */
            }
            is_ok = FALSE;
            p_scb->wait |= BTA_AV_WAIT_ROLE_SW_RES_START;

        }
    }

    return is_ok;
}

/*******************************************************************************
**
** Function         bta_av_chk_mtu
**
** Description      if this is audio channel, check if more than one audio
**                  channel is connected.
**
** Returns          The smallest mtu of the connected audio channels
**
*******************************************************************************/
UINT16 bta_av_chk_mtu(tBTA_AV_SCB *p_scb, UINT16 mtu)
{
    UINT16 ret_mtu = BTA_AV_MAX_A2DP_MTU;
    tBTA_AV_SCB *p_scbi;
    int i;
    UINT8   mask;
    UNUSED(mtu);

    /* TODO_MV mess with the mtu according to the number of EDR/non-EDR headsets */
    if (p_scb->chnl == BTA_AV_CHNL_AUDIO) {
        if (bta_av_cb.audio_open_cnt >= 2) {
            /* more than one audio channel is connected */
            for (i = 0; i < BTA_AV_NUM_STRS; i++) {
                p_scbi = bta_av_cb.p_scb[i];
                if ((p_scb != p_scbi) && p_scbi && (p_scbi->chnl == BTA_AV_CHNL_AUDIO) ) {
                    mask = BTA_AV_HNDL_TO_MSK(i);
                    APPL_TRACE_DEBUG("[%d] mtu: %d, mask:0x%x\n",
                                     i, p_scbi->stream_mtu, mask);
                    if (bta_av_cb.conn_audio & mask) {
                        if (ret_mtu > p_scbi->stream_mtu) {
                            ret_mtu = p_scbi->stream_mtu;
                        }
                    }
                }
            }
        }
        APPL_TRACE_DEBUG("bta_av_chk_mtu audio count:%d, conn_audio:0x%x, ret:%d\n",
                         bta_av_cb.audio_open_cnt, bta_av_cb.conn_audio, ret_mtu);
    }
    return ret_mtu;
}

/*******************************************************************************
**
** Function         bta_av_dup_audio_buf
**
** Description      dup the audio data to the q_info.a2d of other audio channels
**
** Returns          void
**
*******************************************************************************/
void bta_av_dup_audio_buf(tBTA_AV_SCB *p_scb, BT_HDR *p_buf)
{
    tBTA_AV_SCB *p_scbi;
    int     i;
    UINT16  copy_size;
    BT_HDR *p_new;

    if (!p_buf) {
        return;
    }

    if (bta_av_cb.audio_open_cnt >= 2) {
        copy_size = BT_HDR_SIZE + p_buf->len + p_buf->offset;
        /* more than one audio channel is connected */
        for (i = 0; i < BTA_AV_NUM_STRS; i++) {
            p_scbi = bta_av_cb.p_scb[i];
            if ( (p_scb->hdi != i) && /* not the original channel */
                    (bta_av_cb.conn_audio & BTA_AV_HNDL_TO_MSK(i)) && /* connected audio */
                    p_scbi && p_scbi->co_started ) { /* scb is used and started */
                /* enqueue the data only when the stream is started */
                p_new = (BT_HDR *)osi_malloc(copy_size);
                if (p_new) {
                    memcpy(p_new, p_buf, copy_size);
                    list_append(p_scbi->a2d_list, p_new);
                    if (list_length(p_scbi->a2d_list) >  p_bta_av_cfg->audio_mqs) {
                        // Drop the oldest packet
                        bta_av_co_audio_drop(p_scbi->hndl);
                        BT_HDR *p_buf = list_front(p_scbi->a2d_list);
                        list_remove(p_scbi->a2d_list, p_buf);
                        osi_free(p_buf);
                    }
                }
            }
        }
    }

}

/*******************************************************************************
**
** Function         bta_av_sm_execute
**
** Description      State machine event handling function for AV
**
**
** Returns          void
**
*******************************************************************************/
void bta_av_sm_execute(tBTA_AV_CB *p_cb, UINT16 event, tBTA_AV_DATA *p_data)
{
    tBTA_AV_ST_TBL      state_table;
    UINT8               action;

#if (defined(BTA_AV_DEBUG) && BTA_AV_DEBUG == TRUE)
    APPL_TRACE_EVENT("AV event=0x%x(%s) state=%d(%s)\n",
                     event, bta_av_evt_code(event), p_cb->state, bta_av_st_code(p_cb->state));
#else
    APPL_TRACE_EVENT("AV event=0x%x state=%d\n", event, p_cb->state);
#endif

    /* look up the state table for the current state */
    state_table = bta_av_st_tbl[p_cb->state];

    event &= 0x00FF;

    /* set next state */
    p_cb->state = state_table[event][BTA_AV_NEXT_STATE];
    APPL_TRACE_EVENT("next state=%d\n", p_cb->state);

    /* execute action functions */
    if ((action = state_table[event][BTA_AV_ACTION_COL]) != BTA_AV_IGNORE) {
        (*bta_av_action[action])(p_cb, p_data);
    }
}


/*******************************************************************************
**
** Function         bta_av_hdl_event
**
** Description      Advanced audio/video main event handling function.
**
**
** Returns          BOOLEAN
**
*******************************************************************************/
BOOLEAN bta_av_hdl_event(BT_HDR *p_msg)
{
    UINT16 event = p_msg->event;
    UINT16 first_event = BTA_AV_FIRST_NSM_EVT;

    if (event > BTA_AV_LAST_EVT) {
        return TRUE; /* to free p_msg */
    }

    if (event >= first_event) {
#if (defined(BTA_AV_DEBUG) && BTA_AV_DEBUG == TRUE)
        APPL_TRACE_VERBOSE("AV nsm event=0x%x(%s)\n", event, bta_av_evt_code(event));
#else
        APPL_TRACE_VERBOSE("AV nsm event=0x%x\n", event);
#endif
        /* non state machine events */
        (*bta_av_nsm_act[event - BTA_AV_FIRST_NSM_EVT]) ((tBTA_AV_DATA *) p_msg);
    } else if (event >= BTA_AV_FIRST_SM_EVT && event <= BTA_AV_LAST_SM_EVT) {
#if (defined(BTA_AV_DEBUG) && BTA_AV_DEBUG == TRUE)
        APPL_TRACE_VERBOSE("AV sm event=0x%x(%s)\n", event, bta_av_evt_code(event));
#else
        APPL_TRACE_VERBOSE("AV sm event=0x%x\n", event);
#endif
        /* state machine events */
        bta_av_sm_execute(&bta_av_cb, p_msg->event, (tBTA_AV_DATA *) p_msg);
    } else {
        APPL_TRACE_VERBOSE("handle=0x%x\n", p_msg->layer_specific);
        tBTA_AV_SCB *p_scb = bta_av_hndl_to_scb(p_msg->layer_specific);
        p_scb->disc_rsn = p_msg->offset;
        /* stream state machine events */
        bta_av_ssm_execute(p_scb, p_msg->event, (tBTA_AV_DATA *) p_msg);
    }
    return TRUE;
}


/*****************************************************************************
**  Debug Functions
*****************************************************************************/
#if (defined(BTA_AV_DEBUG) && BTA_AV_DEBUG == TRUE)
/*******************************************************************************
**
** Function         bta_av_st_code
**
** Description
**
** Returns          char *
**
*******************************************************************************/
UNUSED_ATTR static char *bta_av_st_code(UINT8 state)
{
    switch (state) {
    case BTA_AV_INIT_ST: return "INIT";
    case BTA_AV_OPEN_ST: return "OPEN";
    default:             return "unknown";
    }
}
/*******************************************************************************
**
** Function         bta_av_evt_code
**
** Description
**
** Returns          char *
**
*******************************************************************************/
char *bta_av_evt_code(UINT16 evt_code)
{
    switch (evt_code) {
    case BTA_AV_API_DISABLE_EVT: return "API_DISABLE";
    case BTA_AV_API_REMOTE_CMD_EVT: return "API_REMOTE_CMD";
    case BTA_AV_API_VENDOR_CMD_EVT: return "API_VENDOR_CMD";
    case BTA_AV_API_VENDOR_RSP_EVT: return "API_VENDOR_RSP";
    case BTA_AV_API_META_RSP_EVT: return "API_META_RSP_EVT";
    case BTA_AV_API_RC_CLOSE_EVT: return "API_RC_CLOSE";
    case BTA_AV_AVRC_OPEN_EVT: return "AVRC_OPEN";
    case BTA_AV_AVRC_MSG_EVT: return "AVRC_MSG";
    case BTA_AV_AVRC_NONE_EVT: return "AVRC_NONE";

    case BTA_AV_API_OPEN_EVT: return "API_OPEN";
    case BTA_AV_API_CLOSE_EVT: return "API_CLOSE";
    case BTA_AV_AP_START_EVT: return "AP_START";
    case BTA_AV_AP_STOP_EVT: return "AP_STOP";
    case BTA_AV_API_RECONFIG_EVT: return "API_RECONFIG";
    case BTA_AV_API_PROTECT_REQ_EVT: return "API_PROTECT_REQ";
    case BTA_AV_API_PROTECT_RSP_EVT: return "API_PROTECT_RSP";
    case BTA_AV_API_RC_OPEN_EVT: return "API_RC_OPEN";
    case BTA_AV_SRC_DATA_READY_EVT: return "SRC_DATA_READY";
    case BTA_AV_CI_SETCONFIG_OK_EVT: return "CI_SETCONFIG_OK";
    case BTA_AV_CI_SETCONFIG_FAIL_EVT: return "CI_SETCONFIG_FAIL";
    case BTA_AV_SDP_DISC_OK_EVT: return "SDP_DISC_OK";
    case BTA_AV_SDP_DISC_FAIL_EVT: return "SDP_DISC_FAIL";
    case BTA_AV_STR_DISC_OK_EVT: return "STR_DISC_OK";
    case BTA_AV_STR_DISC_FAIL_EVT: return "STR_DISC_FAIL";
    case BTA_AV_STR_GETCAP_OK_EVT: return "STR_GETCAP_OK";
    case BTA_AV_STR_GETCAP_FAIL_EVT: return "STR_GETCAP_FAIL";
    case BTA_AV_STR_OPEN_OK_EVT: return "STR_OPEN_OK";
    case BTA_AV_STR_OPEN_FAIL_EVT: return "STR_OPEN_FAIL";
    case BTA_AV_STR_START_OK_EVT: return "STR_START_OK";
    case BTA_AV_STR_START_FAIL_EVT: return "STR_START_FAIL";
    case BTA_AV_STR_CLOSE_EVT: return "STR_CLOSE";
    case BTA_AV_STR_CONFIG_IND_EVT: return "STR_CONFIG_IND";
    case BTA_AV_STR_SECURITY_IND_EVT: return "STR_SECURITY_IND";
    case BTA_AV_STR_SECURITY_CFM_EVT: return "STR_SECURITY_CFM";
    case BTA_AV_STR_WRITE_CFM_EVT: return "STR_WRITE_CFM";
    case BTA_AV_STR_SUSPEND_CFM_EVT: return "STR_SUSPEND_CFM";
    case BTA_AV_STR_RECONFIG_CFM_EVT: return "STR_RECONFIG_CFM";
    case BTA_AV_AVRC_TIMER_EVT: return "AVRC_TIMER";
    case BTA_AV_AVDT_CONNECT_EVT: return "AVDT_CONNECT";
    case BTA_AV_AVDT_DISCONNECT_EVT: return "AVDT_DISCONNECT";
    case BTA_AV_ROLE_CHANGE_EVT: return "ROLE_CHANGE";
    case BTA_AV_AVDT_DELAY_RPT_EVT: return "AVDT_DELAY_RPT";
    case BTA_AV_ACP_CONNECT_EVT: return "ACP_CONNECT";

    case BTA_AV_API_ENABLE_EVT: return "API_ENABLE";
    case BTA_AV_API_REGISTER_EVT: return "API_REG";
    case BTA_AV_API_DEREGISTER_EVT: return "API_DEREG";
    case BTA_AV_API_DISCONNECT_EVT: return "API_DISCNT";
    case BTA_AV_CI_SRC_DATA_READY_EVT: return "CI_DATA_READY";
    case BTA_AV_SIG_CHG_EVT: return "SIG_CHG";
    case BTA_AV_SIG_TIMER_EVT: return "SIG_TMR";
    case BTA_AV_SDP_AVRC_DISC_EVT: return "SDP_AVRC_DISC";
    case BTA_AV_AVRC_CLOSE_EVT: return "AVRC_CLOSE";
    case BTA_AV_CONN_CHG_EVT: return "CONN_CHG";
    case BTA_AV_DEREG_COMP_EVT: return "DEREG_COMP";
#if (BTA_AV_SINK_INCLUDED == TRUE)
    case BTA_AV_API_SINK_ENABLE_EVT: return "SINK_ENABLE";
#endif
#if (AVDT_REPORTING == TRUE)
    case BTA_AV_AVDT_RPT_CONN_EVT: return "RPT_CONN";
#endif
    case BTA_AV_API_START_EVT: return "API_START";
    case BTA_AV_API_STOP_EVT: return "API_STOP";
    default:             return "unknown";
    }
}
#endif

#endif /* BTA_AV_INCLUDED */