Android Camera HAL浅析

1、Camera成像原理介绍

Camera工作流程图

Camera的成像原理可以简单概括如下：

景物(SCENE)通过镜头（LENS）生成的光学图像投射到图像传感器(Sensor)表面上，然后转为电信号，经过A/D（模数转换）转换后变为数字图像信号，再送到数字信号处理芯片（DSP）中加工处理，再通过IO接口传输到CPU中处理，通过DISPLAY就可以看到图像了。

电荷耦合器件(CCD)或互补金属氧化物半导体（CMOS）接收光学镜头传递来的影像，经模/数转换器(A/D)转换成数字信号，经过编码后存储。

流程如下： 
1）、CCD/CMOS将被摄体的光信号转变为电信号—电子图像（模拟信号） 
2）、由模/数转换器（ADC）芯片来将模拟信号转化为数字信号 
3）、数字信号形成后，由DSP或编码库对信号进行压缩并转化为特定的图像文件格式储存

数码相机的光学镜头与传统相机相同，将影像聚到感光器件上，即(光)电荷耦合器件(CCD) 。CCD替代了传统相机中的感光胶片的位置，其功能是将光信号转换成电信号，与电视摄像相同。

CCD是半导体器件，是数码相机的核心，其内含器件的单元数量决定了数码相机的成像质量——像素，单元越多，即像素数高，成像质量越好，通常情况下像素的高低代表了数码相机的档次和技术指标。

2、Android Camera框架

Android的Camera子系统提供一个拍照和录制视频的框架。

它将Camera的上层应用与Application Framework、用户库串接起来，而正是这个用户库来与Camera的硬件层通信，从而实现操作camera硬件。

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3.Camera HAL层部分 
代码存放目录：hardware\rk29\camera
编译：

LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
LOCAL_SRC_FILES:=\
    CameraHal_Module.cpp\
    CameraHal.cpp\
    CameraHal_Utils.cpp\
    MessageQueue.cpp\
    CameraHal_Mem.cpp
...................
ifeq ($(strip $(TARGET_BOARD_HARDWARE)),rk30board)
LOCAL_MODULE:= camera.rk30board

为了实现一个具体功能的Camera，在HAL层需要一个硬件相关的Camera库（例如通过调用video for linux驱动程序和Jpeg编码程序实现或者直接用各个chip厂商实现的私有库来实现，比如Qualcomm实现的libcamera.so和libqcamera.so），此处为camera.rk30board.so实现CameraHardwareInterface规定的接口，来调用相关的库，驱动相关的driver，实现对camera硬件的操作。这个库将被Camera的服务库libcameraservice.so调用。

3.1CameraHal_Module.cpp主要是Camera HAL对上层提供的接口，和实际设备无关，上层的本地库都直接调用这个文件里面提供的接口。

static int camera_device_open(const hw_module_t* module, const char* name,
                hw_device_t** device);
static int camera_device_close(hw_device_t* device);
static int camera_get_number_of_cameras(void);
static int camera_get_camera_info(int camera_id, struct camera_info *info);


static struct hw_module_methods_t camera_module_methods = {
        open: camera_device_open
};


camera_module_t HAL_MODULE_INFO_SYM = {
    common: {
         tag: HARDWARE_MODULE_TAG,
         version_major: ((CONFIG_CAMERAHAL_VERSION&0xff00)>>8),
         version_minor: CONFIG_CAMERAHAL_VERSION&0xff,
         id: CAMERA_HARDWARE_MODULE_ID,
         name: CAMERA_MODULE_NAME,
         author: "RockChip",
         methods: &camera_module_methods,
         dso: NULL, /* remove compilation warnings */
         reserved: {0}, /* remove compilation warnings */
    },
    get_number_of_cameras: camera_get_number_of_cameras,
    get_camera_info: camera_get_camera_info,
};

//CAMERA_DEVICE_NAME              "/dev/video" 以下都是通过读取节点信息来获取摄像头的数目及摄像头设备信息

int camera_device_close(hw_device_t* device)
{
    int ret = 0;
    rk_camera_device_t* rk_dev = NULL;

    LOGD("%s", __FUNCTION__);

    android::Mutex::Autolock lock(gCameraHalDeviceLock);

    if (!device) {
        ret = -EINVAL;
        goto done;
    }

    rk_dev = (rk_camera_device_t*) device;

    if (rk_dev) {
        if (gCameraHals[rk_dev->cameraid]) {
            delete gCameraHals[rk_dev->cameraid];
            gCameraHals[rk_dev->cameraid] = NULL;
            gCamerasOpen--;
        }

        if (rk_dev->base.ops) {
            free(rk_dev->base.ops);
        }
        free(rk_dev);
    }
done:

    return ret;
}

/*******************************************************************
 * implementation of camera_module functions
 *******************************************************************/

/* open device handle to one of the cameras
 *
 * assume camera service will keep singleton of each camera
 * so this function will always only be called once per camera instance
 */

int camera_device_open(const hw_module_t* module, const char* name,
                hw_device_t** device)
{
    int rv = 0;
    int cameraid;
    rk_camera_device_t* camera_device = NULL;
    camera_device_ops_t* camera_ops = NULL;
    android::CameraHal* camera = NULL;

    android::Mutex::Autolock lock(gCameraHalDeviceLock);

    LOGI("camera_device open");

    if (name != NULL) {
        cameraid = atoi(name);

        if(cameraid > gCamerasNumber) {
            LOGE("camera service provided cameraid out of bounds, "
                    "cameraid = %d, num supported = %d",
                    cameraid, gCamerasNumber);
            rv = -EINVAL;
            goto fail;
        }

        if(gCamerasOpen >= CAMERAS_SUPPORTED_SIMUL_MAX) {
            LOGE("maximum number(%d) of cameras already open",gCamerasOpen);
            rv = -ENOMEM;
            goto fail;
        }

        camera_device = (rk_camera_device_t*)malloc(sizeof(*camera_device));
        if(!camera_device) {
            LOGE("camera_device allocation fail");
            rv = -ENOMEM;
            goto fail;
        }

        camera_ops = (camera_device_ops_t*)malloc(sizeof(*camera_ops));
        if(!camera_ops) {
            LOGE("camera_ops allocation fail");
            rv = -ENOMEM;
            goto fail;
        }

        memset(camera_device, 0, sizeof(*camera_device));
        memset(camera_ops, 0, sizeof(*camera_ops));

        camera_device->base.common.tag = HARDWARE_DEVICE_TAG;
        camera_device->base.common.version = 0;
        camera_device->base.common.module = (hw_module_t *)(module);
        camera_device->base.common.close = camera_device_close;
        camera_device->base.ops = camera_ops;

        camera_ops->set_preview_window = camera_set_preview_window;
        camera_ops->set_callbacks = camera_set_callbacks;
        camera_ops->enable_msg_type = camera_enable_msg_type;
        camera_ops->disable_msg_type = camera_disable_msg_type;
        camera_ops->msg_type_enabled = camera_msg_type_enabled;
        camera_ops->start_preview = camera_start_preview;
        camera_ops->stop_preview = camera_stop_preview;
        camera_ops->preview_enabled = camera_preview_enabled;
        camera_ops->store_meta_data_in_buffers = camera_store_meta_data_in_buffers;
        camera_ops->start_recording = camera_start_recording;
        camera_ops->stop_recording = camera_stop_recording;
        camera_ops->recording_enabled = camera_recording_enabled;
        camera_ops->release_recording_frame = camera_release_recording_frame;
        camera_ops->auto_focus = camera_auto_focus;
        camera_ops->cancel_auto_focus = camera_cancel_auto_focus;
        camera_ops->take_picture = camera_take_picture;
        camera_ops->cancel_picture = camera_cancel_picture;
        camera_ops->set_parameters = camera_set_parameters;
        camera_ops->get_parameters = camera_get_parameters;
        camera_ops->put_parameters = camera_put_parameters;
        camera_ops->send_command = camera_send_command;
        camera_ops->release = camera_release;
        camera_ops->dump = camera_dump;

        *device = &camera_device->base.common;

        // -------- RockChip specific stuff --------

        camera_device->cameraid = cameraid;

        camera = new android::CameraHal(cameraid);

        if(!camera) {
            LOGE("Couldn't create instance of CameraHal class");
            rv = -ENOMEM;
            goto fail;
        }

        gCameraHals[cameraid] = camera;
        gCamerasOpen++;
    }

    return rv;

fail:
    if(camera_device) {
        free(camera_device);
        camera_device = NULL;
    }
    if(camera_ops) {
        free(camera_ops);
        camera_ops = NULL;
    }
    if(camera) {
        delete camera;
        camera = NULL;
    }
    *device = NULL;
    return rv;
}

int camera_get_number_of_cameras(void)
{
    char cam_path[20];
    char cam_num[3],i;
    int cam_cnt=0,fd=-1,rk29_cam[CAMERAS_SUPPORT_MAX];
    struct v4l2_capability capability;
    rk_cam_info_t camInfoTmp[CAMERAS_SUPPORT_MAX];
    char *ptr,**ptrr;
    char version[PROPERTY_VALUE_MAX];

    if (gCamerasNumber > 0)
        goto camera_get_number_of_cameras_end;

    memset(version,0x00,sizeof(version));
    sprintf(version,"%d.%d.%d",((CONFIG_CAMERAHAL_VERSION&0xff0000)>>16),
        ((CONFIG_CAMERAHAL_VERSION&0xff00)>>8),CONFIG_CAMERAHAL_VERSION&0xff);
    property_set(CAMERAHAL_VERSION_PROPERTY_KEY,version);

    memset(&camInfoTmp[0],0x00,sizeof(rk_cam_info_t));
    memset(&camInfoTmp[1],0x00,sizeof(rk_cam_info_t));

    for (i=0; i<10; i++) {
        cam_path[0] = 0x00;
        strcat(cam_path, CAMERA_DEVICE_NAME);
        sprintf(cam_num, "%d", i);
        strcat(cam_path,cam_num);
        fd = open(cam_path, O_RDONLY);
        if (fd < 0)
            break;

        memset(&capability, 0, sizeof(struct v4l2_capability));
        if (ioctl(fd, VIDIOC_QUERYCAP, &capability) < 0) {
            LOGE("Video device(%s): query capability not supported.\n",cam_path);
            goto loop_continue;
        }

        if ((capability.capabilities & (V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING)) != (V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING)) {
            LOGD("Video device(%s): video capture not supported.\n",cam_path);
        } else {
            memset(camInfoTmp[cam_cnt&0x01].device_path,0x00, sizeof(camInfoTmp[cam_cnt&0x01].device_path));
            strcat(camInfoTmp[cam_cnt&0x01].device_path,cam_path);
            memset(camInfoTmp[cam_cnt&0x01].fival_list,0x00, sizeof(camInfoTmp[cam_cnt&0x01].fival_list));
            memcpy(camInfoTmp[cam_cnt&0x01].driver,capability.driver, sizeof(camInfoTmp[cam_cnt&0x01].driver));
            camInfoTmp[cam_cnt&0x01].version = capability.version;
            if (strstr((char*)&capability.card[0], "front") != NULL) {
                camInfoTmp[cam_cnt&0x01].facing_info.facing = CAMERA_FACING_FRONT;
            } else {
                camInfoTmp[cam_cnt&0x01].facing_info.facing = CAMERA_FACING_BACK;
            }
            ptr = strstr((char*)&capability.card[0],"-");
            if (ptr != NULL) {
                ptr++;
                camInfoTmp[cam_cnt&0x01].facing_info.orientation = atoi(ptr);
            } else {
                camInfoTmp[cam_cnt&0x01].facing_info.orientation = 0;
            }
            cam_cnt++;

            memset(version,0x00,sizeof(version));
            sprintf(version,"%d.%d.%d",((capability.version&0xff0000)>>16),
                ((capability.version&0xff00)>>8),capability.version&0xff);
            property_set(CAMERADRIVER_VERSION_PROPERTY_KEY,version);

            LOGD("%s(%d): %s:%s",__FUNCTION__,__LINE__,CAMERADRIVER_VERSION_PROPERTY_KEY,version);

            if (cam_cnt >= CAMERAS_SUPPORT_MAX)
                i = 10;
        }
loop_continue:
        if (fd > 0) {
            close(fd);
            fd = -1;
        }
        continue;
    }
    //zyc , change the camera infomation if there is a usb camera
    if((strcmp(camInfoTmp[0].driver,"uvcvideo") == 0)) {
        camInfoTmp[0].facing_info.facing = (camInfoTmp[1].facing_info.facing == CAMERA_FACING_FRONT) ? CAMERA_FACING_BACK:CAMERA_FACING_FRONT;
        camInfoTmp[0].facing_info.orientation = (camInfoTmp[0].facing_info.facing == CAMERA_FACING_FRONT)?270:90;
    } else if((strcmp(camInfoTmp[1].driver,"uvcvideo") == 0)) {
        camInfoTmp[1].facing_info.facing = (camInfoTmp[0].facing_info.facing == CAMERA_FACING_FRONT) ? CAMERA_FACING_BACK:CAMERA_FACING_FRONT;
        camInfoTmp[1].facing_info.orientation = (camInfoTmp[1].facing_info.facing == CAMERA_FACING_FRONT)?270:90;
    }
    gCamerasNumber = cam_cnt;

#if CONFIG_AUTO_DETECT_FRAMERATE
    rk29_cam[0] = 0xff;
    rk29_cam[1] = 0xff;
    for (i=0; i<cam_cnt; i++) {
        if (strcmp((char*)&camInfoTmp[i].driver[0],"rk29xx-camera") == 0) {
            if (strcmp((char*)&camInfoTmp[i].driver[0],(char*)&gCamInfos[i].driver[0]) != 0) {
                rk29_cam[i] = i;
            }
        } else {
            rk29_cam[i] = 0xff;
        }
    }

    if ((rk29_cam[0] != 0xff) || (rk29_cam[1] != 0xff)) {
        if (gCameraFpsDetectThread == NULL) {
            gCameraFpsDetectThread = new CameraFpsDetectThread();
            LOGD("%s create CameraFpsDetectThread for enum camera framerate!!",__FUNCTION__);
            gCameraFpsDetectThread->run("CameraFpsDetectThread", ANDROID_PRIORITY_AUDIO);
        }
    }
#endif
    #if CONFIG_CAMERA_SINGLE_SENSOR_FORCE_BACK_FOR_CTS
    if ((gCamerasNumber==1) && (camInfoTmp[0].facing_info.facing==CAMERA_FACING_FRONT)) {
        gCamerasNumber = 2;
        memcpy(&camInfoTmp[1],&camInfoTmp[0], sizeof(rk_cam_info_t));
        camInfoTmp[1].facing_info.facing = CAMERA_FACING_BACK;
    }
    #endif

    memcpy(&gCamInfos[0], &camInfoTmp[0], sizeof(rk_cam_info_t));
    memcpy(&gCamInfos[1], &camInfoTmp[1], sizeof(rk_cam_info_t));

camera_get_number_of_cameras_end:
    LOGD("%s(%d): Current board have %d cameras attached.",__FUNCTION__, __LINE__, gCamerasNumber);
    return gCamerasNumber;
}

int camera_get_camera_info(int camera_id, struct camera_info *info)
{
    int rv = 0,fp;
    int face_value = CAMERA_FACING_BACK;
    int orientation = 0;
    char process_name[30];

    if(camera_id > gCamerasNumber) {
        LOGE("%s camera_id out of bounds, camera_id = %d, num supported = %d",__FUNCTION__,
                camera_id, gCamerasNumber);
        rv = -EINVAL;
        goto end;
    }

    info->facing = gCamInfos[camera_id].facing_info.facing;
    info->orientation = gCamInfos[camera_id].facing_info.orientation;
end:
    LOGD("%s(%d): camera_%d facing(%d), orientation(%d)",__FUNCTION__,__LINE__,camera_id,info->facing,info->orientation);
    return rv;
}

而对于为上层提供的HAL层接口函数，并不直接操作节点，而是间接的去调用CameraHal.cpp去操作节点。

int camera_start_preview(struct camera_device * device)
{
    int rv = -EINVAL;
    rk_camera_device_t* rk_dev = NULL;

    LOGV("%s", __FUNCTION__);

    if(!device)
        return rv;

    rk_dev = (rk_camera_device_t*) device;

    rv = gCameraHals[rk_dev->cameraid]->startPreview();

    return rv;
}

void camera_stop_preview(struct camera_device * device)
{
    rk_camera_device_t* rk_dev = NULL;

    LOGV("%s", __FUNCTION__);

    if(!device)
        return;

    rk_dev = (rk_camera_device_t*) device;

    gCameraHals[rk_dev->cameraid]->stopPreview();
}

3.2CameraHal.cpp去操作节点来进行实际的操作。
//这个几个线程很关键，分别对应着各种不同的情况，但是一直在运行

CameraHal::CameraHal(int cameraId)
            :mParameters(),
            mSnapshotRunning(-1),
            mCommandRunning(-1),
            mPreviewRunning(STA_PREVIEW_PAUSE),
            mPreviewLock(),
            mPreviewCond(),
            mDisplayRuning(STA_DISPLAY_PAUSE),
            mDisplayLock(),
            mDisplayCond(),
            mANativeWindowLock(),
            mANativeWindowCond(),
            mANativeWindow(NULL),
            mPreviewErrorFrameCount(0),
            mPreviewFrameSize(0),
            mCamDriverFrmHeightMax(0),
            mCamDriverFrmWidthMax(0),
            mPreviewBufferCount(0),
            mCamDriverPreviewFmt(0),
            mCamDriverPictureFmt(0),
            mCamDriverV4l2BufferLen(0),
            mPreviewMemory(NULL),
            mRawBufferSize(0),
            mJpegBufferSize(0),
            mMsgEnabled(0),
            mEffect_number(0),
            mScene_number(0),
            mWhiteBalance_number(0),
            mFlashMode_number(0),
            mGps_latitude(-1),
            mGps_longitude(-1),
            mGps_altitude(-1),
            mGps_timestamp(-1),
            displayThreadCommandQ("displayCmdQ"),
            displayThreadAckQ("displayAckQ"),
            previewThreadCommandQ("previewCmdQ"),
            previewThreadAckQ("previewAckQ"),
            commandThreadCommandQ("commandCmdQ"),
            commandThreadAckQ("commandAckQ"),
            snapshotThreadCommandQ("snapshotCmdQ"),
            snapshotThreadAckQ("snapshotAckQ"),
            mCamBuffer(NULL)
{
    int fp,i;

    cameraCallProcess[0] = 0x00;
    sprintf(cameraCallProcess,"/proc/%d/cmdline",getCallingPid());
    fp = open(cameraCallProcess, O_RDONLY);
    if (fp < 0) {
        memset(cameraCallProcess,0x00,sizeof(cameraCallProcess));
        LOGE("Obtain calling process info failed");
    } else {
        memset(cameraCallProcess,0x00,sizeof(cameraCallProcess));
        read(fp, cameraCallProcess, 30);
        close(fp);
        fp = -1;
        LOGD("Calling process is: %s",cameraCallProcess);
    }

    iCamFd = -1;
    memset(&mCamDriverSupportFmt[0],0, sizeof(mCamDriverSupportFmt));
    mRecordRunning = false;
    mPictureRunning = STA_PICTURE_STOP;
    mExitAutoFocusThread = false;
    mDriverMirrorSupport = false;
    mDriverFlipSupport = false;
    mPreviewCmdReceived = false;
    mPreviewStartTimes = 0x00;
    memset(mCamDriverV4l2Buffer, 0x00, sizeof(mCamDriverV4l2Buffer));
    memset(mDisplayFormat,0x00,sizeof(mDisplayFormat));
    for (i=0; i<CONFIG_CAMERA_PRVIEW_BUF_CNT; i++) {
        mPreviewBufferMap[i] = NULL;
        mDisplayBufferMap[i] = NULL;
        memset(&mGrallocBufferMap[i],0x00,sizeof(rk_previewbuf_info_t));
        mPreviewBufs[i] = NULL;
        mVideoBufs[i] = NULL;

        mPreviewBuffer[i] = NULL;
    }

    //open the rga device,zyc
    mRGAFd = -1;

    if (cameraCreate(cameraId) == 0) {
        initDefaultParameters();

        cameraRawJpegBufferCreate(mRawBufferSize,mJpegBufferSize);

        mDisplayThread = new DisplayThread(this);
        mPreviewThread = new PreviewThread(this);
        mCommandThread = new CommandThread(this);
        mPictureThread = new PictureThread(this);
    mSnapshotThread = new SnapshotThread(this);
        mAutoFocusThread = new AutoFocusThread(this);
        mDisplayThread->run("CameraDispThread",ANDROID_PRIORITY_URGENT_DISPLAY);
        mPreviewThread->run("CameraPreviewThread",ANDROID_PRIORITY_DISPLAY);
        mCommandThread->run("CameraCmdThread", ANDROID_PRIORITY_URGENT_DISPLAY);
        mAutoFocusThread->run("CameraAutoFocusThread", ANDROID_PRIORITY_DISPLAY);
        mSnapshotThread->run("CameraSnapshotThread", ANDROID_PRIORITY_NORMAL);

        LOGD("CameraHal create success!");
    } else {
        mPreviewThread = NULL;
        mDisplayThread = NULL;
        mCommandThread = NULL;
        mPictureThread = NULL;
        mSnapshotThread = NULL;
        mAutoFocusThread = NULL;
    }

}

初始化时参数的配置，默认参数图片大小，分辨率，帧等：

void CameraHal::initDefaultParameters()
{
    CameraParameters params;
    String8 parameterString;
    int i,j,previewFrameSizeMax;
    char cur_param[32],cam_size[10];
    char str_picturesize[100];//We support at most 4 resolutions: 2592x1944,2048x1536,1600x1200,1024x768
    int ret,picture_size_bit;
    struct v4l2_format fmt;

    LOG_FUNCTION_NAME
    memset(str_picturesize,0x00,sizeof(str_picturesize));
    if (CAMERA_IS_UVC_CAMERA()) {
        /*preview size setting*/
        struct v4l2_frmsizeenum fsize;

        memset(&fsize, 0, sizeof(fsize));
        picture_size_bit = 0;
        fsize.index = 0;
        fsize.pixel_format = mCamDriverPreviewFmt;
        while ((ret = ioctl(iCamFd, VIDIOC_ENUM_FRAMESIZES, &fsize)) == 0) {
            if (fsize.type == V4L2_FRMSIZE_TYPE_DISCRETE) {
                if ((fsize.discrete.width == 320) && (fsize.discrete.height == 240)) {
                    if (strcmp(cameraCallProcess,"com.tencent.android.pad") == 0) {
                        fsize.index++;
                        continue;
                    }
                }
                memset(cam_size,0x00,sizeof(cam_size));
                if (parameterString.size() != 0)
                    cam_size[0]=',';
                sprintf((char*)(&cam_size[strlen(cam_size)]),"%d",fsize.discrete.width);
                strcat(cam_size, "x");
                sprintf((char*)(&cam_size[strlen(cam_size)]),"%d",fsize.discrete.height);
                parameterString.append((const char*)cam_size);

                if ((strlen(str_picturesize)+strlen(cam_size))<sizeof(str_picturesize)) {
                    if (fsize.discrete.width <= 2592) {
                        strcat(str_picturesize, cam_size);
                        if (fsize.discrete.width > mCamDriverFrmWidthMax) {
                            mCamDriverFrmWidthMax = fsize.discrete.width;
                            mCamDriverFrmHeightMax = fsize.discrete.height;
                        }
                    }
                } else {
                    break;
                }
            } else if (fsize.type == V4L2_FRMSIZE_TYPE_CONTINUOUS) {

                break;
            } else if (fsize.type == V4L2_FRMSIZE_TYPE_STEPWISE) {

                break;
            }
            fsize.index++;
        }
        if (ret != 0 && errno != EINVAL) {
            LOGE("ERROR enumerating frame sizes: %d\n", errno);
        }

        params.set(CameraParameters::KEY_SUPPORTED_PREVIEW_SIZES, parameterString.string());
        params.setPreviewSize(640,480);
        /*picture size setting*/
        params.set(CameraParameters::KEY_SUPPORTED_PICTURE_SIZES, str_picturesize);
        params.setPictureSize(mCamDriverFrmWidthMax,  mCamDriverFrmHeightMax);

        if (mCamDriverFrmWidthMax <= 1024) {
            mRawBufferSize = RAW_BUFFER_SIZE_1M;
            mJpegBufferSize = JPEG_BUFFER_SIZE_1M;
        } else if (mCamDriverFrmWidthMax <= 1600) {
            mRawBufferSize = RAW_BUFFER_SIZE_2M;
            mJpegBufferSize = JPEG_BUFFER_SIZE_2M;
        } else if (mCamDriverFrmWidthMax <= 2048) {
            mRawBufferSize = RAW_BUFFER_SIZE_3M;
            mJpegBufferSize = JPEG_BUFFER_SIZE_3M;
        } else if (mCamDriverFrmWidthMax <= 2592) {
            mRawBufferSize = RAW_BUFFER_SIZE_5M;
            mJpegBufferSize = JPEG_BUFFER_SIZE_5M;
        } else {
            LOGE("%s(%d):Camera Hal is only support 5Mega camera, but the uvc camera is %dx%d",
                 __FUNCTION__,__LINE__,mCamDriverFrmWidthMax, mCamDriverFrmHeightMax);
            mRawBufferSize = RAW_BUFFER_SIZE_5M;
            mJpegBufferSize = JPEG_BUFFER_SIZE_5M;
        }

        /* set framerate */
        struct v4l2_streamparm setfps;

        memset(&setfps, 0, sizeof(struct v4l2_streamparm));
        setfps.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
        setfps.parm.capture.timeperframe.numerator=1;
        setfps.parm.capture.timeperframe.denominator=15;
        ret = ioctl(iCamFd, VIDIOC_S_PARM, &setfps);

        /*frame rate setting*/
        params.set(CameraParameters::KEY_SUPPORTED_PREVIEW_FRAME_RATES, "15");
        params.setPreviewFrameRate(15);
        /*frame per second setting*/
        parameterString = "15000,15000";
        params.set(CameraParameters::KEY_PREVIEW_FPS_RANGE, parameterString.string());
        parameterString = "(15000,15000)";
        params.set(CameraParameters::KEY_SUPPORTED_PREVIEW_FPS_RANGE, parameterString.string());
        /*not support zoom */
        params.set(CameraParameters::KEY_ZOOM_SUPPORTED, "false");

    } else if (CAMERA_IS_RKSOC_CAMERA()) {

        fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
        fmt.fmt.pix.pixelformat= mCamDriverPreviewFmt;
        fmt.fmt.pix.field = V4L2_FIELD_NONE;

        /*picture size setting*/
        fmt.fmt.pix.width = 10000;
        fmt.fmt.pix.height = 10000;
        ret = ioctl(iCamFd, VIDIOC_TRY_FMT, &fmt);

        mCamDriverFrmWidthMax = fmt.fmt.pix.width;
        mCamDriverFrmHeightMax = fmt.fmt.pix.height;

        if (mCamDriverFrmWidthMax > 2592) {
            LOGE("Camera driver support maximum resolution(%dx%d) is overflow 5Mega!",mCamDriverFrmWidthMax,mCamDriverFrmHeightMax);
            mCamDriverFrmWidthMax = 2592;
            mCamDriverFrmHeightMax = 1944;
        }

        /*preview size setting*/
        if (mCamDriverFrmWidthMax >= 176) {
            fmt.fmt.pix.width = 176;
            fmt.fmt.pix.height = 144;
            if (ioctl(iCamFd, VIDIOC_TRY_FMT, &fmt) == 0) {
                if ((fmt.fmt.pix.width == 176) && (fmt.fmt.pix.height == 144)) {
                    parameterString.append("176x144");
                    params.setPreviewSize(176, 144);
                    previewFrameSizeMax =  PAGE_ALIGN(176*144*2)*2;          // 176*144*2     rgb565
                    //params.set(CameraParameters::KEY_PREFERRED_PREVIEW_SIZE_FOR_VIDEO,"176x144");
                }
            }
        }

        if ((mCamDriverCapability.version & 0xff) >= 0x07) {
            int tmp0,tmp1;
            if (cameraFramerateQuery(mCamDriverPreviewFmt, 240,160,&tmp1,&tmp0) == 0) {
                if (mCamDriverFrmWidthMax >= 240) {
                    fmt.fmt.pix.width = 240;
                    fmt.fmt.pix.height = 160;
                    if (ioctl(iCamFd, VIDIOC_TRY_FMT, &fmt) == 0) {
                        if ((fmt.fmt.pix.width == 240) && (fmt.fmt.pix.height == 160)) {
                            parameterString.append(",240x160");
                            params.setPreviewSize(240, 160);
                            previewFrameSizeMax =  PAGE_ALIGN(240*160*2)*2;          // 240*160*2     rgb565

                        }
                    }
                }
            }
        }

        if (strcmp(cameraCallProcess,"com.tencent.android.pad")) {
            if (mCamDriverFrmWidthMax >= 320) {
                fmt.fmt.pix.width = 320;
                fmt.fmt.pix.height = 240;
                if (ioctl(iCamFd, VIDIOC_TRY_FMT, &fmt) == 0) {
                    if ((fmt.fmt.pix.width == 320) && (fmt.fmt.pix.height == 240)) {
                        parameterString.append(",320x240");
                        params.setPreviewSize(320, 240);
                        previewFrameSizeMax =  PAGE_ALIGN(320*240*2)*2;          // 320*240*2

                    }
                }
            }
        }
        if (mCamDriverFrmWidthMax >= 352) {
            fmt.fmt.pix.width = 352;
            fmt.fmt.pix.height = 288;
            if (ioctl(iCamFd, VIDIOC_TRY_FMT, &fmt) == 0) {
                if ((fmt.fmt.pix.width == 352) && (fmt.fmt.pix.height == 288)) {
                    parameterString.append(",352x288");
                    params.setPreviewSize(352, 288);
                    previewFrameSizeMax =  PAGE_ALIGN(352*288*2)*2;          // 352*288*1.5*2

                }
            }
        }

        if (mCamDriverFrmWidthMax >= 640) {
            fmt.fmt.pix.width = 640;
            fmt.fmt.pix.height = 480;
            if (ioctl(iCamFd, VIDIOC_TRY_FMT, &fmt) == 0) {
                if ((fmt.fmt.pix.width == 640) && (fmt.fmt.pix.height == 480)) {
                    parameterString.append(",640x480");
                    params.setPreviewSize(640, 480);
                    previewFrameSizeMax =  PAGE_ALIGN(640*480*2)*2;          // 640*480*1.5*2

                }
            }
        }

        if (mCamDriverFrmWidthMax >= 720) {
            fmt.fmt.pix.width = 720;
            fmt.fmt.pix.height = 480;
            if (ioctl(iCamFd, VIDIOC_TRY_FMT, &fmt) == 0) {
                if ((fmt.fmt.pix.width == 720) && (fmt.fmt.pix.height == 480)) {
                    parameterString.append(",720x480");
                    previewFrameSizeMax =  PAGE_ALIGN(720*480*2)*2;          // 720*480*1.5*2

                }
            }
        }

        if (mCamDriverFrmWidthMax >= 1280) {
            fmt.fmt.pix.width = 1280;
            fmt.fmt.pix.height = 720;
            if (ioctl(iCamFd, VIDIOC_TRY_FMT, &fmt) == 0) {
                if ((fmt.fmt.pix.width == 1280) && (fmt.fmt.pix.height == 720)) {
                    parameterString.append(",1280x720");
                    previewFrameSizeMax =  PAGE_ALIGN(1280*720*2)*2;          // 1280*720*1.5*2

                }
            }
        }
        mSupportPreviewSizeReally = parameterString;
        /* [email protected]: Facelock speed is low, so scale down preview data to facelock for speed up */
        if ((strcmp(cameraCallProcess,"com.android.facelock")==0)) {
            if (strstr(mSupportPreviewSizeReally.string(),"640x480")||
                strstr(mSupportPreviewSizeReally.string(),"320x240")) {
                parameterString = "160x120";
                params.setPreviewSize(160, 120);
            }
        }
        params.set(CameraParameters::KEY_SUPPORTED_PREVIEW_SIZES, parameterString.string());

        strcat(str_picturesize,parameterString.string());
        strcat(str_picturesize,",");
        if(mCamDriverFrmWidthMax <= 640){
            strcat( str_picturesize,"640x480,320x240");
            mRawBufferSize = RAW_BUFFER_SIZE_0M3;
            mJpegBufferSize = JPEG_BUFFER_SIZE_0M3;
            params.setPictureSize(640,480);
        }else if (mCamDriverFrmWidthMax <= 1280) {
            strcat( str_picturesize,"1024x768,640x480,320x240");
            mRawBufferSize = RAW_BUFFER_SIZE_1M;
            mJpegBufferSize = JPEG_BUFFER_SIZE_1M;
            params.setPictureSize(1024,768);
        } else if (mCamDriverFrmWidthMax <= 1600) {
            strcat( str_picturesize,"1600x1200,1024x768,640x480");
            mRawBufferSize = RAW_BUFFER_SIZE_2M;
            mJpegBufferSize = JPEG_BUFFER_SIZE_2M;
            params.setPictureSize(1600,1200);
        } else if (mCamDriverFrmWidthMax <= 2048) {
            strcat( str_picturesize,"2048x1536,1600x1200,1024x768");
            mRawBufferSize = RAW_BUFFER_SIZE_3M;
            mJpegBufferSize = JPEG_BUFFER_SIZE_3M;
            params.setPictureSize(2048,1536);
        } else if (mCamDriverFrmWidthMax <= 2592) {
            strcat( str_picturesize,"2592x1944,2048x1536,1600x1200,1024x768");
            params.setPictureSize(2592,1944);
            mRawBufferSize = RAW_BUFFER_SIZE_5M;
            mJpegBufferSize = JPEG_BUFFER_SIZE_5M;
        } else {
            sprintf(str_picturesize, "%dx%d", mCamDriverFrmWidthMax,mCamDriverFrmHeightMax);
            mRawBufferSize = RAW_BUFFER_SIZE_5M;
            mJpegBufferSize = JPEG_BUFFER_SIZE_5M;
            params.setPictureSize(mCamDriverFrmWidthMax,mCamDriverFrmHeightMax);
        }

        params.set(CameraParameters::KEY_SUPPORTED_PICTURE_SIZES, str_picturesize);

        /*frame rate setting*/
        cameraFpsInfoSet(params);

        /*zoom setting*/
        struct v4l2_queryctrl zoom;
        char str_zoom_max[3],str_zoom_element[5];
        char str_zoom[200];
        strcpy(str_zoom, "");//default zoom
        int max;

        zoom.id = V4L2_CID_ZOOM_ABSOLUTE;
        if (!ioctl(iCamFd, VIDIOC_QUERYCTRL, &zoom)) {
            mZoomMax = zoom.maximum;
            mZoomMin= zoom.minimum;
            mZoomStep = zoom.step;

            max = (mZoomMax - mZoomMin)/mZoomStep;
            sprintf(str_zoom_max,"%d",max);
            params.set(CameraParameters::KEY_ZOOM_SUPPORTED, "true");
            params.set(CameraParameters::KEY_MAX_ZOOM, str_zoom_max);
            params.set(CameraParameters::KEY_ZOOM, "0");
            for (i=mZoomMin; i<=mZoomMax; i+=mZoomStep) {
                sprintf(str_zoom_element,"%d,", i);
                strcat(str_zoom,str_zoom_element);
            }
            params.set(CameraParameters::KEY_ZOOM_RATIOS, str_zoom);
        }
    }
    /*preview format setting*/
    params.set(CameraParameters::KEY_SUPPORTED_PREVIEW_FORMATS, "yuv420sp,rgb565,yuv420p");
    params.set(CameraParameters::KEY_VIDEO_FRAME_FORMAT,CameraParameters::PIXEL_FORMAT_YUV420SP);
    if (strcmp(cameraCallProcess,"com.android.camera")==0) {    //for PanoramaActivity
        params.setPreviewFormat(CameraParameters::PIXEL_FORMAT_RGB565);
    } else {
        params.setPreviewFormat(CameraParameters::PIXEL_FORMAT_YUV420SP);
    }
    /* [email protected]: preset the displayformat for cts */
    strcpy(mDisplayFormat,CAMERA_DISPLAY_FORMAT_NV12);


    params.set(CameraParameters::KEY_VIDEO_FRAME_FORMAT,CameraParameters::PIXEL_FORMAT_YUV420SP);

    /*picture format setting*/
    params.set(CameraParameters::KEY_SUPPORTED_PICTURE_FORMATS, CameraParameters::PIXEL_FORMAT_JPEG);
    params.setPictureFormat(CameraParameters::PIXEL_FORMAT_JPEG);

    /*jpeg quality setting*/
    params.set(CameraParameters::KEY_JPEG_QUALITY, "70");

    /*white balance setting*/
    struct v4l2_queryctrl whiteBalance;
    struct v4l2_querymenu *whiteBalance_menu = mWhiteBalance_menu;
    char str_whitebalance[200];
    strcpy(str_whitebalance, "");//default whitebalance
    whiteBalance.id = V4L2_CID_DO_WHITE_BALANCE;
    if (!ioctl(iCamFd, VIDIOC_QUERYCTRL, &whiteBalance)) {
        for (i = whiteBalance.minimum; i <= whiteBalance.maximum; i += whiteBalance.step) {
            whiteBalance_menu->id = V4L2_CID_DO_WHITE_BALANCE;
            whiteBalance_menu->index = i;
            if (!ioctl(iCamFd, VIDIOC_QUERYMENU, whiteBalance_menu)) {
                if (i != whiteBalance.minimum)
                    strcat(str_whitebalance, ",");
                strcat(str_whitebalance, (char *)whiteBalance_menu->name);
                if (whiteBalance.default_value == i) {
                    strcpy(cur_param, (char *)whiteBalance_menu->name);
                }
                mWhiteBalance_number++;
            }
            whiteBalance_menu++;
        }
        params.set(CameraParameters::KEY_SUPPORTED_WHITE_BALANCE, str_whitebalance);
        params.set(CameraParameters::KEY_WHITE_BALANCE, cur_param);
    }

    /*color effect setting*/
    struct v4l2_queryctrl effect;
    struct v4l2_querymenu *effect_menu = mEffect_menu;
    char str_effect[200];
    strcpy(str_effect, "");//default effect
    effect.id = V4L2_CID_EFFECT;
    if (!ioctl(iCamFd, VIDIOC_QUERYCTRL, &effect)) {
        for (i = effect.minimum; i <= effect.maximum; i += effect.step) {
            effect_menu->id = V4L2_CID_EFFECT;
            effect_menu->index = i;
            if (!ioctl(iCamFd, VIDIOC_QUERYMENU, effect_menu)) {
                if (i != effect.minimum)
                    strcat(str_effect, ",");
                strcat(str_effect, (char *)effect_menu->name);
                if (effect.default_value == i) {
                    strcpy(cur_param, (char *)effect_menu->name);
                }
                mEffect_number++;
            }
            effect_menu++;
        }
        params.set(CameraParameters::KEY_SUPPORTED_EFFECTS, str_effect);
        params.set(CameraParameters::KEY_EFFECT, cur_param);
    }

    /*scene setting*/
    struct v4l2_queryctrl scene;
    struct v4l2_querymenu *scene_menu = mScene_menu;
    char str_scene[200];
    strcpy(str_scene, "");//default scene
    scene.id = V4L2_CID_SCENE;
    if (!ioctl(iCamFd, VIDIOC_QUERYCTRL, &scene)) {
        for (i=scene.minimum; i<=scene.maximum; i+=scene.step) {
            scene_menu->id = V4L2_CID_SCENE;
            scene_menu->index = i;
            if (!ioctl(iCamFd, VIDIOC_QUERYMENU, scene_menu)) {
                if (i != scene.minimum)
                    strcat(str_scene, ",");
                strcat(str_scene, (char *)scene_menu->name);
                if (scene.default_value == i) {
                    strcpy(cur_param, (char *)scene_menu->name);
                }
                mScene_number++;
            }
            scene_menu++;
        }
        params.set(CameraParameters::KEY_SUPPORTED_SCENE_MODES, str_scene);
        params.set(CameraParameters::KEY_SCENE_MODE, cur_param);

    }

    /*flash mode setting*/
    struct v4l2_queryctrl flashMode;
    struct v4l2_querymenu *flashMode_menu = mFlashMode_menu;
    char str_flash[200];
    strcpy(str_flash, "");//default flash
    flashMode.id = V4L2_CID_FLASH;
    if (!ioctl(iCamFd, VIDIOC_QUERYCTRL, &flashMode)) {
        for (i = flashMode.minimum; i <= flashMode.maximum; i += flashMode.step) {
            flashMode_menu->id = V4L2_CID_FLASH;
            flashMode_menu->index = i;
            if (!ioctl(iCamFd, VIDIOC_QUERYMENU, flashMode_menu)) {
                if (i != flashMode.minimum)
                    strcat(str_flash, ",");
                strcat(str_flash, (char *)flashMode_menu->name);
                if (flashMode.default_value == i) {
                    strcpy(cur_param, (char *)flashMode_menu->name);
                }
                mFlashMode_number++;
            }
            flashMode_menu++;
        }
        params.set(CameraParameters::KEY_SUPPORTED_FLASH_MODES, str_flash);
        params.set(CameraParameters::KEY_FLASH_MODE, cur_param);
    }

    /*focus mode setting*/
    struct v4l2_queryctrl focus;

    parameterString = CameraParameters::FOCUS_MODE_FIXED;
    params.set(CameraParameters::KEY_FOCUS_MODE, CameraParameters::FOCUS_MODE_FIXED);
    focus.id = V4L2_CID_FOCUS_AUTO;
    if (!ioctl(iCamFd, VIDIOC_QUERYCTRL, &focus)) {
        parameterString.append(",");
        parameterString.append(CameraParameters::FOCUS_MODE_AUTO);
        params.set(CameraParameters::KEY_FOCUS_MODE, CameraParameters::FOCUS_MODE_AUTO);
    }

    focus.id = V4L2_CID_FOCUS_CONTINUOUS;
    if (!ioctl(iCamFd, VIDIOC_QUERYCTRL, &focus)) {
        parameterString.append(",");
        parameterString.append(CameraParameters::FOCUS_MODE_EDOF);
    }

    focus.id = V4L2_CID_FOCUS_ABSOLUTE;
    if (!ioctl(iCamFd, VIDIOC_QUERYCTRL, &focus)) {
        parameterString.append(",");
        parameterString.append(CameraParameters::FOCUS_MODE_INFINITY);
        parameterString.append(",");
        parameterString.append(CameraParameters::FOCUS_MODE_MACRO);
    }

    params.set(CameraParameters::KEY_SUPPORTED_FOCUS_MODES, parameterString.string());

    /*mirror and flip query*/
    struct v4l2_queryctrl mirror,flip;

    mirror.id = V4L2_CID_HFLIP;
    if (!ioctl(iCamFd, VIDIOC_QUERYCTRL, &mirror)) {
        mDriverMirrorSupport = true;
    } else {
        mDriverMirrorSupport = false;
    }

    flip.id = V4L2_CID_VFLIP;
    if (!ioctl(iCamFd, VIDIOC_QUERYCTRL, &flip)) {
        mDriverFlipSupport = true;
    } else {
        mDriverFlipSupport = false;
    }


    /*Exposure setting*/
    struct v4l2_queryctrl exposure;
    char str_exposure[16];
    exposure.id = V4L2_CID_EXPOSURE;
    if (!ioctl(iCamFd, VIDIOC_QUERYCTRL, &exposure)) {
        sprintf(str_exposure,"%d",exposure.default_value);
        params.set(CameraParameters::KEY_EXPOSURE_COMPENSATION, str_exposure);
        sprintf(str_exposure,"%d",exposure.maximum);
        params.set(CameraParameters::KEY_MAX_EXPOSURE_COMPENSATION, str_exposure);
        sprintf(str_exposure,"%d",exposure.minimum);
        params.set(CameraParameters::KEY_MIN_EXPOSURE_COMPENSATION, str_exposure);
        sprintf(str_exposure,"%d",exposure.step);
        params.set(CameraParameters::KEY_EXPOSURE_COMPENSATION_STEP, str_exposure);
    } else {
        params.set(CameraParameters::KEY_EXPOSURE_COMPENSATION, "0");
        params.set(CameraParameters::KEY_MAX_EXPOSURE_COMPENSATION, "0");
        params.set(CameraParameters::KEY_MIN_EXPOSURE_COMPENSATION, "0");
        params.set(CameraParameters::KEY_EXPOSURE_COMPENSATION_STEP, "0.000001f");
    }
    /*rotation setting*/
    params.set(CameraParameters::KEY_ROTATION, "0");

    /*[email protected] :add some settings to pass cts*/
    /*focus distance setting ,no much meaning ,only for passing cts */
    parameterString = "0.3,50,Infinity";
    params.set(CameraParameters::KEY_FOCUS_DISTANCES, parameterString.string());
    /*focus length setting ,no much meaning ,only for passing cts */
    parameterString = "35";
    params.set(CameraParameters::KEY_FOCAL_LENGTH, parameterString.string());
   /*horizontal angle of view setting ,no much meaning ,only for passing cts */
    parameterString = "100";
    params.set(CameraParameters::KEY_HORIZONTAL_VIEW_ANGLE, parameterString.string());
    /*vertical angle of view setting ,no much meaning ,only for passing cts */
    parameterString = "100";
    params.set(CameraParameters::KEY_VERTICAL_VIEW_ANGLE, parameterString.string());

   /*quality of the EXIF thumbnail in Jpeg picture setting */
    parameterString = "50";
    params.set(CameraParameters::KEY_JPEG_THUMBNAIL_QUALITY, parameterString.string());
   /*supported size of the EXIF thumbnail in Jpeg picture setting */
    parameterString = "0x0,160x128";
    params.set(CameraParameters::KEY_SUPPORTED_JPEG_THUMBNAIL_SIZES, parameterString.string());
    parameterString = "160";
    params.set(CameraParameters::KEY_JPEG_THUMBNAIL_WIDTH, parameterString.string());
    parameterString = "128";
    params.set(CameraParameters::KEY_JPEG_THUMBNAIL_HEIGHT, parameterString.string());
    /* [email protected]: for cts ,KEY_MAX_NUM_DETECTED_FACES_HW should not be 0 */
    params.set(CameraParameters::KEY_MAX_NUM_DETECTED_FACES_HW, "0");
    params.set(CameraParameters::KEY_MAX_NUM_DETECTED_FACES_SW, "0");
    params.set(CameraParameters::KEY_RECORDING_HINT,"false");
    params.set(CameraParameters::KEY_VIDEO_STABILIZATION_SUPPORTED,"false");
    params.set(CameraParameters::KEY_VIDEO_SNAPSHOT_SUPPORTED,"true");
    params.set(CameraParameters::KEY_MAX_NUM_METERING_AREAS,"0");

    LOGD ("Support Preview format: %s ",params.get(CameraParameters::KEY_SUPPORTED_PREVIEW_FORMATS));
    LOGD ("Support Preview sizes: %s ",params.get(CameraParameters::KEY_SUPPORTED_PREVIEW_SIZES));
    LOGD ("Support Preview FPS range: %s",params.get(CameraParameters::KEY_SUPPORTED_PREVIEW_FPS_RANGE));
    LOGD ("Support Preview framerate: %s",params.get(CameraParameters::KEY_SUPPORTED_PREVIEW_FRAME_RATES));
    LOGD ("Support Picture sizes: %s ",params.get(CameraParameters::KEY_SUPPORTED_PICTURE_SIZES));
    if (params.get(CameraParameters::KEY_SUPPORTED_WHITE_BALANCE))
        LOGD ("Support white balance: %s",params.get(CameraParameters::KEY_SUPPORTED_WHITE_BALANCE));
    if (params.get(CameraParameters::KEY_SUPPORTED_EFFECTS))
        LOGD ("Support color effect: %s",params.get(CameraParameters::KEY_SUPPORTED_EFFECTS));
    if (params.get(CameraParameters::KEY_SUPPORTED_SCENE_MODES))
        LOGD ("Support scene: %s",params.get(CameraParameters::KEY_SUPPORTED_SCENE_MODES));
    if (params.get(CameraParameters::KEY_SUPPORTED_FLASH_MODES))
        LOGD ("Support flash: %s",params.get(CameraParameters::KEY_SUPPORTED_FLASH_MODES));
    LOGD ("Support focus: %s",params.get(CameraParameters::KEY_SUPPORTED_FOCUS_MODES));
    LOGD ("Support zoom: %s(ratios: %s)",params.get(CameraParameters::KEY_ZOOM_SUPPORTED),
        params.get(CameraParameters::KEY_ZOOM_RATIOS));
    if (strcmp("0", params.get(CameraParameters::KEY_MAX_EXPOSURE_COMPENSATION))
        || strcmp("0", params.get(CameraParameters::KEY_MIN_EXPOSURE_COMPENSATION))) {
        LOGD ("Support exposure: (%s -> %s)",params.get(CameraParameters::KEY_MIN_EXPOSURE_COMPENSATION),
            params.get(CameraParameters::KEY_MAX_EXPOSURE_COMPENSATION));
    }
    LOGD ("Support hardware faces detecte: %s",params.get(CameraParameters::KEY_MAX_NUM_DETECTED_FACES_HW));
    LOGD ("Support software faces detecte: %s",params.get(CameraParameters::KEY_MAX_NUM_DETECTED_FACES_SW));
    LOGD ("Support video stabilization: %s",params.get(CameraParameters::KEY_VIDEO_STABILIZATION_SUPPORTED));
    LOGD ("Support recording hint: %s",params.get(CameraParameters::KEY_RECORDING_HINT));
    LOGD ("Support video snapshot: %s",params.get(CameraParameters::KEY_VIDEO_SNAPSHOT_SUPPORTED));
    LOGD ("Support Mirror and Filp: %s",(mDriverMirrorSupport && mDriverFlipSupport)? "true":"false");

    cameraConfig(params);
    LOG_FUNCTION_NAME_EXIT

}

然后剩下的大部分都是针对这个线程的运行实现以及对于CameraHal_Module.cpp中实现的为上层提供的接口的具体实现，比如：

int CameraHal::startPreview()
{
    LOG_FUNCTION_NAME
    Message msg;
    Mutex::Autolock lock(mLock);

    if ((mPreviewThread != NULL) && (mCommandThread != NULL)) {
        msg.command = CMD_PREVIEW_START;
        msg.arg1 = (void*)CMDARG_NACK;
        commandThreadCommandQ.put(&msg);
    }
    mPreviewCmdReceived = true;
    LOG_FUNCTION_NAME_EXIT
    return NO_ERROR ;
}

void CameraHal::stopPreview()
{
    LOG_FUNCTION_NAME
    Message msg;
    int ret = 0;
    Mutex::Autolock lock(mLock);

    if ((mPreviewThread != NULL) && (mCommandThread != NULL)) {
        msg.command = CMD_PREVIEW_STOP;
        msg.arg1 = (void*)CMDARG_ACK;
        commandThreadCommandQ.put(&msg);

        if (mANativeWindow == NULL) {
            mANativeWindowCond.signal();
            LOGD("%s(%d): wake up command thread for stop preview",__FUNCTION__,__LINE__);
        }

        while (ret == 0) {
            ret = commandThreadAckQ.get(&msg);
            if (ret == 0) {
                if (msg.command == CMD_PREVIEW_STOP) {
                    ret = 1;
                }
            }
        }
    } else {
        LOGE("%s(%d): cancel, because thread (%s %s) is NULL", __FUNCTION__,__LINE__,(mPreviewThread == NULL)?"mPreviewThread":" ",
            (mCommandThread == NULL)?"mCommandThread":" ");
    }
    mPreviewCmdReceived = false;
    LOG_FUNCTION_NAME_EXIT
}

int CameraHal::autoFocus()
{
    LOG_FUNCTION_NAME
    int ret = 0;
    Message msg;
    Mutex::Autolock lock(mLock);

    if ((mPreviewThread != NULL) && (mCommandThread != NULL)) {
        msg.command = CMD_AF_START;
        msg.arg1 = (void*)CMDARG_ACK;
        commandThreadCommandQ.put(&msg);
        while (ret == 0) {
            ret = commandThreadAckQ.get(&msg,5000);
            if (ret == 0) {
                if (msg.command == CMD_AF_START) {
                    ret = 1;
                }
            } else {
                LOGE("%s(%d): AutoFocus is time out!!!\n",__FUNCTION__,__LINE__);
            }
        }
    } else {
        LOGE("%s(%d):  cancel, because thread (%s %s) is NULL", __FUNCTION__,__LINE__,(mPreviewThread == NULL)?"mPreviewThread":" ",
            (mCommandThread == NULL)?"mCommandThread":" ");
    }
    LOG_FUNCTION_NAME_EXIT
    return NO_ERROR;
}

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