ag_sdpextra.c

bluetooth audio gateway

#include "ag_private.h"

#include <message.h>
#include <print.h>
#include <stdlib.h>
#include <string.h>



/* request to retrieve the headset support for remote volume control */
static const uint8 headsetAttributeRequest [] =
{
    0x35,               /* 0b00110 101 type=DataElSeq size=SeeBelow*/
    0x03,               /* ...3 bytes in DataElSeq */    
    0x09, 0x03, 0x02    /* 2 byte UINT attrID RemoteAudioVolCtrl */
};


/* request to retrieve the hands free supported features data */
static const uint8 handsfreeAttributeRequest [] =
{
    0x35,               /* 0b00110 101 type=DataElSeq size=SeeBelow*/
    0x03,               /* ...3 bytes in DataElSeq */    
    0x09, 0x03, 0x11    /* 2 byte UINT attrID SupportedFeatures */
};


/*
    agGetExtraSdpInfo

    Request extra information stored in the remote device's SDP record.    
*/
void agGetExtraSdpInfo(void)
{                        
    if (agIsCurrentlyHandsFree())
    {
        MAKE_MSG(CM_SDP_SUPPORTED_FEATURES_REQ);
        msg->target = HANDSFREE_TARGET;
        msg->attr_req_length = sizeof(handsfreeAttributeRequest);
        msg->attr_req = (uint8 *) agAlloc(msg->attr_req_length);
        memcpy(msg->attr_req, handsfreeAttributeRequest, msg->attr_req_length);
        agPutCmMsg(msg);
    }
    else if (agIsCurrentlyHeadset())
    {
        MAKE_MSG(CM_SDP_SUPPORTED_FEATURES_REQ);
        msg->target = HEADSET_TARGET;
        msg->attr_req_length = sizeof(headsetAttributeRequest);
        msg->attr_req = (uint8 *) agAlloc(msg->attr_req_length);
        memcpy(msg->attr_req, headsetAttributeRequest, msg->attr_req_length);
        agPutCmMsg(msg);
    }
    else
    {                   
        PRINT(("Unknown device type\n"));                                
    }                        
}


/*
    agSdpFeaturesCfm

    Returns the extra SDP info (if any) obtained from the remote device
*/
void agSdpFeaturesCfm(const CM_SDP_SUPPORTED_FEATURES_CFM_T *cfm)
{       
    uint16 count = 0;
    uint16 data_fields = cfm->num_fields;    

    /* TODO don't retry forever */
    if (!cfm->result)
    {
        /* try search again */
        /* agGetExtraSdpInfo(); */
        AGState.hfSupportedFeatures = 0;

        /* just in case any memory was allocated */
        if (cfm->num_fields > 0)
            free(cfm->sdp_data);

        return;
    }

    /* 
        TODO if the supported features field is not present in the sdp record 
        you must assume default values for the supported features
    */
    while(data_fields > 0)
    {
        switch(cfm->sdp_data[count].data_type)
        {
        case CmHeadsetRemoteAudioVolCtrl:
            PRINT(("Headset remote audio vol support 0x%x\n", 
                cfm->sdp_data[count].data_value));
            break;

        case CmHandsFreeSupportedFeatures:
            PRINT(("Handsfree Supported Features 0x%x\n", 
                cfm->sdp_data[count].data_value));

            /* Only five LSBs valid so mask the rest off */
            AGState.hfSupportedFeatures = cfm->sdp_data[count].data_value & 0x1f;
            break;

        case CmHandsfreeAgNetwork:
        case CmHandsfreeAgSuportedFeatues:
        default:
            PRINT(("ag_sdpExtra: Unknown data type 0x%x value 0x%x\n", 
                cfm->sdp_data[count].data_type, cfm->sdp_data[count].data_value));
        }
        count++;
        data_fields--;
    }
    
    /* Free the data */    
    if (cfm->num_fields > 0)
        free(cfm->sdp_data);        
}