由于最近研究OIS，而android4.4并没有相关逻辑（vendor&hal&kernel）当然android 6.0拥有完善逻辑，增加OIS光学防抖参数设置（ois参数一般不作为设置参数，仅作实验测试）：
A：上层逻辑
1) 添加接口函数
参考public void setSaturation(int saturation)设置
在code/frameworks/base/core/java/android/hardware/Camera.java文件增加接口：
定义用于app层设置的接口函数：
public void setOis(int saturation){…………
set(KEY_QC_OIS, String.valueOf(OIS));
}
2) App设置参数调用，假设设置ois值为1
参考 packages/apps/SnapdragonCamera/src/com/android/camera/PhotoModule.java
mParameters.setSaturation(saturation);函数调用；
mParameters.setOis(ois); //app调用接口函数
由于HAL V1参数传递是通过字符串来完成的，最后传递到HAL层的字符串里面会有“ois=1”，在HAL层进行解析。
B、Hal层相关修改：
1、 添加相关定义
1.1、 文件：hardware/qcom/camera/QCamera2/HAL/QCameraParameters.h
static const char KEY_QC_SCE_FACTOR_STEP[];
+ static const char KEY_QC_OIS[];
static const char KEY_QC_HISTOGRAM[] ;
int32_t setSharpness(const QCameraParameters& );
+ int32_t setOis(const QCameraParameters& );
int32_t setSaturation(const QCameraParameters& );
int32_t setSharpness(int sharpness);
+ int32_t setOis(int ois);
int32_t setSaturation(int saturation);
1.2、 文件：hardware/qcom/camera/QCamera2/stack/common/cam_types.h
typedef enum {
CAM_INTF_PARM_FLASH_BRACKETING,
CAM_INTF_PARM_GET_IMG_PROP,
CAM_INTF_PARM_MAX
+ CAM_INTF_PARM_OIS
} cam_intf_parm_type_t;
1.3、 文件：hardware/qcom/camera/QCamera2/stack/common/cam_intf.h
typedef struct{
cam_af_bracketing_t mtf_af_bracketing_parm;
cam_sensor_type_t sensor_type;
+
+ int32_t ois_default_value;
} cam_capability_t;
2、 添加相关设置
文件：hardware/qcom/camera/QCamera2/HAL/QCameraParameters.cpp
const char QCameraParameters::KEY_QC_SCE_FACTOR_STEP[] = "sce-factor-step";
+const char QCameraParameters::KEY_QC_OIS[] = "ois";
//open camera时OIS默认值，该值在vendor中设置
int32_t QCameraParameters::initDefaultParameters()
{
………
+ // Set Ois+ setOis(m_pCapability->ois_default_value); //m_pCapability即为通过共享内存从vendor层拿到的初始化数据
//请参考Android ION机制_HAL与vendor层共享内存_流程简介(1)
//http://blog.csdn.net/liwei16611/article/details/51104400
+ ALOGE("the default_ois = %d", m_pCapability->ois_default_value);// Set Contrast
set(KEY_QC_MIN_CONTRAST, m_pCapability->contrast_ctrl.min_value);
set(KEY_QC_MAX_CONTRAST, m_pCapability->contrast_ctrl.max_value);
………
}
+int32_t QCameraParameters::setOis(const QCameraParameters& params)
+{
+ int ois = params.getInt(KEY_QC_OIS);
+ int prev_ois = getInt(KEY_QC_OIS);
+ if(params.get(KEY_QC_OIS) == NULL) {
+ CDBG_HIGH("%s: Ois not set by App ",__func__);
+ return NO_ERROR;
+ }
+ ALOGE("haljay ois=%d prev_ois=%d",ois, prev_ois);
+ if (prev_ois != ois) {
+ if((ois >= 0) && (ois <= 2)) {
+ CDBG(" new ois value : %d ", ois);
+ return setOis(ois);
+ } else {
+ ALOGE("%s: invalid value %d",__func__, ois);
+ return BAD_VALUE;
+ }
+ } else {
+ ALOGE("haljay no value change");
+ CDBG("%s: No value change in ois", __func__);
+ return NO_ERROR;
+ }
+}
+int32_t QCameraParameters::setOis(int ois)
+{
+ char val[16];
+ sprintf(val, "%d", ois);
+ updateParamEntry(KEY_QC_OIS, val);
+ CDBG("%s: Setting ois %s", __func__, val);
+ ALOGE("haljay %s set ois=%s OIS=%d", __func__, val, CAM_INTF_PARM_OIS);
+ int32_t value = ois;
+ return AddSetParmEntryToBatch(m_pParamBuf,
+ CAM_INTF_PARM_OIS,
+ sizeof(value),
+ &value);
+}
函数int32_t QCameraParameters::updateParameters添加setOis：
if ((rc = setBrightness(params))) final_rc = rc;
if ((rc = setZoom(params))) final_rc = rc;
if ((rc = setSharpness(params))) final_rc = rc;
+ if ((rc = setOis(params))) final_rc = rc;
if ((rc = setSaturation(params))) final_rc = rc;
C、Vendor层相关修改：
1、 添加相关定义
1.1、 文件：kernel/include/media/msm_cam_sensor.h
enum msm_actuator_cfg_type_t {
CFG_SET_POSITION,
CFG_ACTUATOR_POWERDOWN,
CFG_ACTUATOR_POWERUP,
+ CFG_ACTUATOR_OIS,
};
struct msm_actuator_cfg_data {
struct msm_actuator_get_info_t get_info;
struct msm_actuator_set_position_t setpos;
enum af_camera_name cam_name;
+ void *setting;
} cfg;
1.2、 文件：vendor/qcom/proprietary/mm-camera/mm-camera2/media-controller/mct/pipeline/mct_pipeline.c
在函数boolean mct_pipeline_populate_query_cap_buffer(mct_pipeline_t *pipeline)中添加：
hal_data->sharpness_ctrl.min_value = 0;
hal_data->sharpness_ctrl.step = 6;
+ hal_data->ois_default_value = 1; //通过ION机制传至hal层
hal_data->contrast_ctrl.def_value = 5;
hal_data->contrast_ctrl.max_value = 10;
1.3、 文件：vendor/qcom/proprietary/mm-camera/mm-camera2/media-controller/modules/sensors/module/sensor_common.h
typedef enum {
SENSOR_SET_AWB_UPDATE,
+ ACTUATOR_SET_OIS
} sensor_submodule_event_type_t;
2、 添加相关设置
文件：vendor/qcom/proprietary/mm-camera/mm-camera2/media-controller/modules/sensors/module/module_sensor.c
2.1、获取hal层参数
在函数static boolean module_sensor_event_control_set_parm中增加：
+ case CAM_INTF_PARM_OIS:{
+ if (!event_control->parm_data) {
+ SERR("failed parm_data NULL");
+ ret = FALSE;
+ break;
+ }
+ module_sensor_params_t *ois_module_params = NULL;
+ ois_module_params = s_bundle->module_sensor_params[SUB_MODULE_ACTUATOR];
+ if (ois_module_params->func_tbl.process != NULL) {
+ rc = ois_module_params->func_tbl.process(
+ ois_module_params->sub_module_private,
+ ACTUATOR_SET_OIS, event_control->parm_data);
+ }
+ if (rc < 0) {
+ SERR("failed");
+ ret = FALSE;
+ }
+ break;
+ }
文件：vendor/qcom/proprietary/mm-camera/mm-camera2/media-controller/modules/sensors/actuators/actuator.c
2.2、在函数int32_t actuator_process中增加：
case ACTUATOR_SET_POSITION:
rc = actuator_set_position(actuator_ctrl, data);
break;
+
+ case ACTUATOR_SET_OIS:
+ rc = actuator_set_ois(actuator_ctrl, data);
+ break;
2.3、将参数通过ioctl方法下至内核
+static int actuator_set_ois(void *ptr, void *data) {
+ int rc = 0;
+ int32_t *ois_level = (int32_t*)data;
+ actuator_data_t *ois_actuator_ptr = (actuator_data_t *)ptr;
+ struct msm_actuator_cfg_data cfg;
+ if (ois_actuator_ptr->fd <= 0)
+ return -EINVAL;
+ cfg.cfgtype = CFG_ACTUATOR_OIS;
+ cfg.cfg.setting = ois_level;
+
+ rc = ioctl(ois_actuator_ptr->fd, VIDIOC_MSM_ACTUATOR_CFG, &cfg);
+ if (rc < 0) {
+ SERR("failed-errno: %s!!!",strerror(errno));
+ }
+ return rc;
+}