Android 设置参数至kernel_ois为例

转载来自：http://blog.csdn.net/liwei16611/article/details/51104491

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;

+}