Android Camera HAL淺析

1、Camera成像原理介紹

Camera工作流程圖

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Camera的成像原理可以簡單概括如下：

景物(SCENE)通過鏡頭（LENS）生成的光學圖像投射到圖像傳感器(Sensor)表面上，然后轉為電信號，經過A/D（模數轉換）轉換后變為數字 圖像信號，再送到數字信號處理芯片（DSP）中加工處理，再通過IO接口傳輸到CPU中處理，通過DISPLAY就可以看到圖像了。

電荷耦合器件(CCD)或互補金屬氧化物半導體（CMOS）接收光學鏡頭傳遞來的影像，經模/數轉換器(A/D)轉換成數字信號，經過編碼后存儲。

流程如下：?
1）、CCD/CMOS將被攝體的光信號轉變為電信號—電子圖像（模擬信號）?
2）、由模/數轉換器（ADC）芯片來將模擬信號轉化為數字信號?
3）、數字信號形成后，由DSP或編碼庫對信號進行壓縮并轉化為特定的圖像文件格式儲存

數碼相機的光學鏡頭與傳統相機相同，將影像聚到感光器件上，即(光)電荷耦合器件(CCD) 。CCD替代了傳統相機中的感光膠片的位置，其功能是將光信號轉換成電信號，與電視攝像相同。

CCD是半導體器件，是數碼相機的核心，其內含器件的單元數量決定了數碼相機的成像質量——像素，單元越多，即像素數高，成像質量越好，通常情況下像素的高低代表了數碼相機的檔次和技術指標。

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2、Android Camera框架

Android的Camera子系統提供一個拍照和錄制視頻的框架。

它將Camera的上層應用與Application Framework、用戶庫串接起來，而正是這個用戶庫來與Camera的硬件層通信，從而實現操作camera硬件。

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3.Camera HAL層部分?
代碼存放目錄：hardware\rk29\camera
編譯：

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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??

為了實現一個具體功能的Camera，在HAL層需要一個硬件相關的Camera庫（例如通過調用video for linux驅動程序和Jpeg編碼程序實現或者直接用各個chip廠商實現的私有庫來實現，比如Qualcomm實現的libcamera.so和 libqcamera.so），此處為camera.rk30board.so實現CameraHardwareInterface規定的接口，來調用相 關的庫，驅動相關的driver，實現對camera硬件的操作。這個庫將被Camera的服務庫libcameraservice.so調用。

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3.1CameraHal_Module.cpp主要是Camera HAL對上層提供的接口，和實際設備無關，上層的本地庫都直接調用這個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" 以下都是通過讀取節點信息來獲取攝像頭的數目及攝像頭設備信息

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++)?{??< span="">
????????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;??
}??

而對于為上層提供的HAL層接口函數，并不直接操作節點，而是間接的去調用CameraHal.cpp去操作節點。

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去操作節點來進行實際的操作。
//這個幾個線程很關鍵，分別對應著各種不同的情況，但是一直在運行

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++)?{??< span="">
????????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;??
????}??
??
}??

初始化時參數的配置，默認參數圖片大小，分辨率，幀等：

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;??
????????/*?ddl@rock-chips.com:?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);?????
????}??
????/*?zyc@rock-chips.com:?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");??
??
????/*lzg@rockchip.com?: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());???
????/*?zyc@rock-chips.com:?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針對這個線程的運行實現以及對于CameraHal_Module.cpp中實現的為上層提供的接口的具體實現，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;??
}??

?

<pre?name=< span="">"code"?class="cpp"><pre?name=< span="">"code"?class="cpp"><pre?name=< span="">"code"?class="cpp">
<pre?name=< span="">"code"?class="cpp"><pre?name=< span="">"code"?class="cpp"><pre?name=< span="">"code"?class="cpp">