text: /******************************************************************************
   *
   *  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 */
  