openCamera的 hal 端流程

本文从流程、代码、log三个方面介绍openCamera 0的hal端流程。

一，流程图

二，代码逻辑

从SprdCamera3Factory开始

int SprdCamera3Factory::open(const struct hw_module_t *module, const char *id,struct hw_device_t **hw_device) {HAL_LOGD("E");return gSprdCamera3Factory.open_(module, id, hw_device);
}

继续调用SprdCamera3Factory的 open_ 函数：

1，校验
2，是否支持multicamera（我们以Camera 0为例说明，暂不考虑这些情况）
3，继续调用 cameraDeviceOpen

int SprdCamera3Factory::open_(const struct hw_module_t *module, const char *id,struct hw_device_t **hw_device) {//1，校验if (module != &HAL_MODULE_INFO_SYM.common) {HAL_LOGE("invalid param module %p, expect %p", module,&HAL_MODULE_INFO_SYM.common);return -EINVAL;}if (!id || !hw_device) {HAL_LOGE("invalid param");return -EINVAL;}int idInt = atoi(id);if (idInt < 0) {HAL_LOGE("invalid param camera_id: %s", id);return -EINVAL;}idInt = idCheck(idInt);int cameraId = overrideCameraIdIfNeeded(idInt);HAL_LOGI("open camera %d", cameraId);if (SPRD_FRONT_HIGH_RES == cameraId ||SPRD_BACK_HIGH_RESOLUTION_ID == cameraId) {sensor_set_HD_mode(1);} else {sensor_set_HD_mode(0);}/* try dynamic ID */if (mUseCameraId == DynamicId && cameraId < mNumberOfCameras) {int ret = mCameras[cameraId]->openCamera(hw_device);if (!ret && mTorchHelper)mTorchHelper->lockTorch(cameraId);return ret;}//2，是否支持multicamera，并且为也是cameraId（我们以Camera 0为例说明，暂不考虑这些情况）
#ifdef CONFIG_MULTICAMERA_SUPPORT/* try private multi-camera */if (cameraId == SPRD_MULTI_CAMERA_ID || cameraId == SPRD_FOV_FUSION_ID ||cameraId == SPRD_DUAL_VIEW_VIDEO_ID)return SprdCamera3MultiCamera::camera_device_open(module, id,hw_device);
#endifif(atoi(id) == SPRD_BLUR_ID || atoi(id) == SPRD_PORTRAIT_ID)switchTuningParam((int)SENSOR_TUNING_PARAM_BOKEH);elseswitchTuningParam((int)SENSOR_TUNING_PARAM_DEFAULT);/* try other multi-camera */if (mWrapper && is_single_expose(cameraId))return mWrapper->cameraDeviceOpen(module, id, hw_device);//3，继续调用 cameraDeviceOpen/* then try single camera */return cameraDeviceOpen(cameraId, hw_device);
}

SprdCamera3Factory 的 cameraDeviceOpen 函数

1，实例化 SprdCamera3HWI，并传入cameraId
2，调用 SprdCamera3HWI 的 openCamera

int SprdCamera3Factory::cameraDeviceOpen(int camera_id,struct hw_device_t **hw_device) {int rc = NO_ERROR;int phyId = 0;int is_high_res_mode = 0;unsigned int on_off = 0;struct phySensorInfo *phyPtr = NULL;char prop[PROPERTY_VALUE_MAX];phyId = multi_id_to_phyid(camera_id);if (camera_id < 0 || phyId >= mNumOfCameras)return -ENODEV;if (phyId < 0)phyId = 0;phyPtr = sensorGetPhysicalSnsInfo(phyId);if (phyPtr->phyId != phyPtr->slotId)return -ENODEV;//1，实例化 SprdCamera3HWI，并传入cameraIdSprdCamera3HWI *hw = new SprdCamera3HWI(phyId);if (!hw) {HAL_LOGE("Allocation of hardware interface failed");return NO_MEMORY;}// Only 3d calibration use this// TBD: move 3d calibration to multi cameraHAL_LOGD("SPRD Camera Hal, camera_id=%d", camera_id);if (SPRD_3D_CALIBRATION_ID == camera_id) {hw->setMultiCameraMode(MODE_3D_CALIBRATION);property_set("vendor.cam.dualmode", "high_mode");}if (SPRD_BOKEH_CALI_GOLDEN_ID == camera_id) {hw->setMultiCameraMode(MODE_BOKEH_CALI_GOLDEN);property_set("vendor.cam.dualmode", "high_mode");}if (SPRD_OPTICSZOOM_W_ID == camera_id) {hw->setMultiCameraMode(MODE_OPTICSZOOM_CALIBRATION);}if (SPRD_OPTICSZOOM_T_ID == camera_id) {hw->setMultiCameraMode(MODE_OPTICSZOOM_CALIBRATION);}//2，调用 SprdCamera3HWI 的 openCamerarc = hw->openCamera(hw_device);if (rc != 0) {delete hw;} else {if (SPRD_FRONT_HIGH_RES == camera_id ||SPRD_BACK_HIGH_RESOLUTION_ID == camera_id) {is_high_res_mode = 1;hw->camera_ioctrl(CAMERA_TOCTRL_SET_HIGH_RES_MODE,&is_high_res_mode, NULL);}property_get("persist.vendor.cam.ultrawide.enable", prop, "1");if (SPRD_ULTRA_WIDE_ID == camera_id)on_off = atoi(prop);hw->camera_ioctrl(CAMERA_IOCTRL_ULTRA_WIDE_MODE, &on_off, NULL);}return rc;
}

流程转到SprdCamera3HWI中

SprdCamera3HWI::openCamera(struct hw_device_t **hw_device) === 》
int SprdCamera3HWI::openCamera()

1，创建SprdCamera3Setting，并传入mCameraId
2，创建SprdCamera3OEMIf，并传入mCameraId
3，调用SprdCamera3OEMIf的openCamera函数

int SprdCamera3HWI::openCamera() {ATRACE_CALL();int ret = NO_ERROR;HAL_LOGI(":hal3: E camId=%d", mCameraId);if (mCameraId >= CAMERA_ID_COUNT) {HAL_LOGE("hal_err: mCameraId is invalid");return UNKNOWN_ERROR;}if (mOEMIf) {HAL_LOGE("Failure: Camera already opened");return ALREADY_EXISTS;}//1，创建SprdCamera3Setting，并传入mCameraIdmSetting = new SprdCamera3Setting(mCameraId);if (mSetting == NULL) {HAL_LOGE("alloc setting failed.");return NO_MEMORY;}//2，创建SprdCamera3OEMIf，并传入mCameraIdmOEMIf = new SprdCamera3OEMIf(mCameraId, mSetting);if (!mOEMIf) {HAL_LOGE("alloc oemif failed.");if (mSetting) {delete mSetting;mSetting = NULL;}return NO_MEMORY;}mOEMIf->camera_ioctrl(CAMERA_IOCTRL_SET_MULTI_CAMERAMODE, &mMultiCameraMode,NULL);mOEMIf->camera_ioctrl(CAMERA_IOCTRL_SET_MASTER_ID, &mMasterId, NULL);//3，调用SprdCamera3OEMIf的openCamera函数ret = mOEMIf->openCamera();if (ret) {HAL_LOGE("mOEMIf->openCamera failed");if (mOEMIf) {delete mOEMIf;mOEMIf = NULL;}if (mSetting) {delete mSetting;mSetting = NULL;}return ret;}mCameraOpened = true;if (mOEMIf->isIspToolMode()) {mOEMIf->ispToolModeInit();startispserver(mCameraId);ispvideo_RegCameraFunc(1, ispVideoStartPreview);ispvideo_RegCameraFunc(2, ispVideoStopPreview);ispvideo_RegCameraFunc(3, ispVideoTakePicture);ispvideo_RegCameraFunc(4, ispVideoSetParam);ispvideo_RegCameraFunc(5, ispVideoSetJpegQuality);}HAL_LOGI(":hal3: X");return NO_ERROR;
}

流程转到SprdCamera3OEMIf中

SprdCamera3OEMIf的openCamera函数很长，其中关键点在调用oem层的camera_init函数，还有一些与otp相关的内容

ret = mHalOem->ops->camera_init(mCameraId, camera_cb, this, 0,&mCameraHandle, (void *)Callback_IonMalloc,(void *)Callback_Free);

三，log

打开主摄Camera的log

Cam3Factory的open
113381:11-16 15:37:51.194   460   985 D Cam3Factory: 171, open: E
113383:11-16 15:37:51.194   460   985 I Cam3Factory: 499, open_: open camera 0
构建SprdCamera3HWI
113391:11-16 15:37:51.195   460   985 I Cam3HWI : 127, SprdCamera3HWI: :hal3: Constructor E camId=0
113392:11-16 15:37:51.195   460   985 D Cam3HWI : 130, SprdCamera3HWI: mCameraId 0,mCameraDevice 0xe2dc1abc
113393:11-16 15:37:51.195   460   985 I Cam3HWI : 167, SprdCamera3HWI: :hal3: Constructor X
Cam3Factory的cameraDeviceOpen
113394:11-16 15:37:51.195   460   985 D Cam3Factory: 584, cameraDeviceOpen: SPRD Camera Hal, camera_id=0
SprdCamera3HWI的openCamera
113395:11-16 15:37:51.195   460   985 D Cam3HWI : 296, openCamera: camera3->open E
113396:11-16 15:37:51.195   460   985 I Cam3HWI : 339, openCamera: :hal3: E camId=0
构建SprdCamera3OEMIf
113397:11-16 15:37:51.195   460   985 I Cam3OEMIf: 607, SprdCamera3OEMIf: :hal3: Constructor E camId=0
113460:11-16 15:37:51.204   460   985 D Cam3OEMIf: 2732, setCameraState: X: camera state = SPRD_INIT, preview state = SPRD_IDLE, capture state = SPRD_IDLE focus state = SPRD_IDLE set param state = SPRD_IDLE
113528:11-16 15:37:51.212   460   985 I Cam3OEMIf: 675, SprdCamera3OEMIf: loaded libcamoem.so mHalOem->dso = 0x6a19bc5b
113529:11-16 15:37:51.212   460   985 I Cam3OEMIf: 812, SprdCamera3OEMIf: :hal3: Constructor X
SprdCamera3OEMIf的openCamera
113534:11-16 15:37:51.212   460   985 I Cam3OEMIf: 6687, openCamera: :hal3: E camId=0
113535:11-16 15:37:51.212   460   985 D Cam3OEMIf: 12188, log_monitor_thread_init: mLogMonitor init, 2
SprdCamera3OEMIf调用OEM端的camera_init
113538:11-16 15:37:51.213   460   985 I Cam3OEMIf: 6774, openCamera: :hal3: camera_init
113539:11-16 15:37:51.213   460  7952 I Cam3OEMIf: 12116, log_monitor_thread_proc: E, 2
114324:11-16 15:37:51.543   460   985 D Cam3OEMIf: 2732, setCameraState: X: camera state = SPRD_IDLE, preview state = SPRD_IDLE, capture state = SPRD_IDLE focus state = SPRD_IDLE set param state = SPRD_IDLE
114352:11-16 15:37:51.543   460   985 D Cam3OEMIf: 6823, openCamera: camera_id 0, mMultiCameraMode 0
114369:11-16 15:37:51.544   460   985 I Cam3OEMIf: 7054, openCamera: sprd_3dcalibration_cap_size w=3264, h=2448
114371:11-16 15:37:51.544   460   985 I Cam3OEMIf: 7065, openCamera: mIommuEnabled=1
114372:11-16 15:37:51.544   460   985 I Cam3OEMIf: 7331, setCamSecurity: multi camera mode = 0
114375:11-16 15:37:51.544   460  8005 D Cam3OEMIf: 11957, ZSLMode_monitor_thread_proc: zsl thread message.msg_type 0x801, sub-type 0x0, ret 0
114376:11-16 15:37:51.544   460  8005 D Cam3OEMIf: 11964, ZSLMode_monitor_thread_proc: zsl thread msg init
SprdCamera3OEMIf的openCamera结束
114377:11-16 15:37:51.544   460   985 I Cam3OEMIf: 7094, openCamera: :hal3: X
SprdCamera3HWI的openCamera结束
114378:11-16 15:37:51.544   460   985 I Cam3HWI : 394, openCamera: :hal3: X
114379:11-16 15:37:51.544   460   985 D Cam3HWI : 330, openCamera: camera3->open X mCameraSessionActive 1

我们看到Camera3Factory中的cameraId这个值，在实例化 SprdCamera3HWI、SprdCamera3Setting、SprdCamera3OEMIf时，均会传入。所以可以得知cameraId是与上述实例一对一绑定的，在closeCamera时，会将其实例销毁

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