qualcomm platform 3a algorithm -- awb

3A algorithm consists of auto exposure ,auto white balance and auto focous.The describtion sequence is based on different files.

1.config.c (vendor/qcom/proprietary/mm-camera/targers/gtcommon/config/config.c)

(1)int8_t config_init_ctrl(void) 

Is a damon thread,the beginning is int8_t config_init_ctrl(void) ,in this function there is a invoked function isp3a_init(&cfgctrl) == FALSE),the cfgctrl is global variable.cfgctrl is initialized in this function,and among the following procedurce ,lots parameters are from this parameter.

(2)int8_t isp3a_init(void *cctrl)

int8_t isp3a_init(void *cctrl)
{
...
  isp3a_ctrl_t   *ctrl3a = &(ctrl->isp3aCtrl);   // is pointer conversion, so,realization, is cfgctrl be initiated.

  sensor_ctrl_t *sensor = &(ctrl->sensorCtrl);

/*sensor_from_chromatix_3a_t,this structrue is related with the chromatix_XXX.h file,which we use to tune camera*/
  sensor_from_chromatix_3a_t *chroma = &(sensor->chromatixAnd3a); 

/*Parameters got above be used*/   
  isp3a_load_chroma(chroma, &(ctrl3a->isp3a_input.isp3a_chromatix)); //Filed of ctrl3a be assigned
  isp3a_load_sensor(sensor, &(ctrl3a->isp3a_input.isp3a_sensor));    //Filed of ctrl3a be assigned

  if (!aec_init(ctrl3a))
    CDBG("aec init failedn");

  if (!awb_init(ctrl3a))
    CDBG("awb init failedn");

  if (!af_init(ctrl3a))
    CDBG("af init failedn");

  if (!sd_init(ctrl3a ))
    CDBG("sd init failedn");

  ctrl3a->isp3a_input.vfeStatStruct = malloc(sizeof(isp3a_stats_out_t));
  if (ctrl3a->isp3a_input.vfeStatStruct == NULL) {
    CDBG("ctrl3a->isp3a_input.vfeStatStruct malloc failedn");
    return FALSE;
  }
  ....
} /* isp3a_init */

(1)int8_t awb_init(isp3a_ctrl_t *ctrl3a)  

In this function awbCtrl be created and assigned first, and thenawb_settings_init(ctrl3a) be called.

(2)static void awb_settings_init(isp3a_ctrl_t *ctrl3a)

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