Camera Request 流程源码分析

和你一起终身学习，这里是程序员Android

经典好文推荐，通过阅读本文，您将收获以下知识点:

Camera 起预览时候回调用CameraCaptureSession类的setRepeatingRequest方法，该方法的实现是由CameraCaptureSessionImpl来完成的。

(frameworks\base\core\java\android\hardware\camera2)




    // 主要功能实现是通过CameraCaptureSessionImpl 实现




    public abstract int setRepeatingRequest();

(frameworks\base\core\java\android\hardware\camera2\impl)




    public int setRepeatingRequest(CaptureRequest request,......){



    ... ...



    // 调用 CameraDeviceImpl中的 setRepeatingRequest方法




     return addPendingSequence(());



    ... ...



    }

第一个参数CaptureRequest只有一个Request，而在后面会将它包装成List.

(frameworks\base\core\java\android\hardware\camera2\impl)




 



    public int setRepeatingRequest(){



        List<CaptureRequest> requestList = new ArrayList<CaptureRequest>();



        (request)



        



         return submitCaptureRequest(requestList, callback, handler, /*streaming*/true);



    }



 



 



    private int submitCaptureRequest() {



            ... ...



            // 通过Binder 调用 CameraDeviceClient 方法




            requestInfo = (requestArray, repeating);



            ... ...     



    }

mRemoteDevice 是CameraServer进程当中执行openCamera成功后返回给Client端Binder对象的代理，它和CameraServer进程当中的CameraDeviceClient对象是对应的，只不过这里的mRemoteDevice还经过了Framework一点包装处理而已。

(frameworks\av\services\camera\libcameraservice\api2)




    binder::Status CameraDeviceClient::submitRequestList(){



        if(streaming){



            //预览




            mDevice->setStreamingRequestList();



        }else{



            //拍照  




             mDevice->captureList();



        }



    }

(frameworks\av\services\camera\libcameraservice\device3)




    //预览




    status_t Camera3Device::setStreamingRequestList(){



        //预览和拍照都会调用到   submitRequestsHelper 方法




        submitRequestsHelper();



    }



 



 



    //拍照




    status_t Camera3Device::captureList(){



        //预览和拍照都会调用到   submitRequestsHelper 方法




        submitRequestsHelper();



    }



 



    //  submitRequestsHelper 方法实现




    status_t Camera3Device::submitRequestsHelper(){



    



        if (repeating) {



                        //预览流程 setRepeatingRequests处理




            res = mRequestThread->setRepeatingRequests(requestList, lastFrameNumber);



        } else {



                        // 拍照流程处理 queueRequestList




            res = mRequestThread->queueRequestList(requestList, lastFrameNumber);



        }



    }



    //预览




    status_t Camera3Device::RequestThread::setRepeatingRequests(){



      ... ...



    }



    //拍照




    status_t Camera3Device::RequestThread::queueRequestList(){



     ... ...



    }



  



    //mRequestThread 流程分析




    status_t Camera3Device::initializeCommonLocked() {



    



         mRequestThread = new RequestThread();



         res=mRequestThread->run();



    



    }



    



    // (frameworks\av\services\camera\libcameraservice\device3) 




    class RequestThread : public Thread {



        ... ...



    }



    



    bool Camera3Device::RequestThread::threadLoop(){



    



        // Handle paused state. 如果没有Request请求时，将会等待50ms，再进行下一次判断




        if (waitIfPaused()) {



            return true;



        }



        //  最重要的三个方法  for the next batch of requests.拍照请求的优先级肯定是高于预览请求




        waitForNextRequestBatch();



        



        ... ...



        // 最重要的三个方法  a batch of HAL requests and output buffers. 




        res = prepareHalRequests();



        



        ... ...



        //最重要的三个方法 3.如果该值为true，那么继续循环 




        submitRequestSuccess = sendRequestsBatch();



    }



    



    bool Camera3Device::RequestThread::sendRequestsBatch() {



    



    



        res = mInterface->processBatchCaptureRequests(requests, &numRequestProcessed);



    



    }



    status_t Camera3Device::HalInterface::processBatchCaptureRequests(){



    



    



            if (hidlSession_3_4 != nullptr) {



                // 调用  中的方法




                err = hidlSession_3_4->proce*tureRequest_3_4( );



            } else {



                err = mHidlSession->proce*tureRequest( );



            }



    



    }

(hardware\interfaces\camera\device\3.4\default)




    Return<void> CameraDeviceSession::proce*tureRequest_3_4(){



    



         s = processOneCaptureRequest_3_4(requests[i])



    }



    



    Status CameraDeviceSession::processOneCaptureRequest_3_4(){



    



        // 这个会跳转到  中的process_capture_request 方法， 需要继续厘清跳转地方     




        ATRACE_BEGIN("camera3->process_capture_request");



        status_t ret = mDevice->ops->process_capture_request(mDevice, &halRequest);



        ATRACE_END();



    }

(vendor\qcom\proprietary\camx\src\core\hal)




    int process_capture_request(){



        // 会跳转到 process_capture_request 方法




        pHAL3->process_capture_request(pCamera3DeviceAPI, pCaptureRequestAPI);



    }

(vendor\qcom\proprietary\camx\src\core\hal)




    static int process_capture_request(){



    



          result = pHALDevice->Proce*tureRequest(pRequest);



    }

(vendor\qcom\proprietary\camx\src\core\hal)




    CamxResult HALDevice::Proce*tureRequest(){



        //调用  chi_override_process_request 方法




        result = GetCHIAppCallbacks()->chi_override_process_request()



    }

(vendor\qcom\proprietary\chi-cdk\core\chiframework)




    static CDKResult chi_override_process_request(){



        // 调用  OverrideProcessRequest方法




        return pExtensionModule->OverrideProcessRequest();



    



    }

(vendor\qcom\proprietary\chi-cdk\core\chiframework)




    CDKResult ExtensionModule::OverrideProcessRequest(){



    



        //选取 Usecase 去做Proce*tureRequest操作




        result = m_pSelectedUsecase[logicalCameraId]->Proce*tureRequest(pCaptureRequest);



    }

(vendor\qcom\proprietary\chi-cdk\core\chiframework)




    CDKResult Usecase::Proce*tureRequest(){



        // 调用指定的UseCase




        result = ExecuteCaptureRequest(pRequest);



    



    }

(vendor\qcom\proprietary\chi-cdk\core\chiusecase)




    CDKResult AdvancedCameraUsecase::ExecuteCaptureRequest(){



    



    



        if(TRUE == AdvancedFeatureEnabled()){



                 // AdvancedFeatureEnabled HDR MFNR 




         result = pFeature->ExecuteProcessRequest(pRequest);



        }else{



        



        // 没有任何Feature 执行的流程,拍照




         result = CameraUsecaseBase::ExecuteCaptureRequest(pRequest);



        }



    }



    



    



    CDKResult CameraUsecaseBase::ExecuteCaptureRequest(){



        // 没有任何Feature 执行的流程




        CheckAndActivatePipeline(m_sessions[session].pSession);



            ...  ...



        result = SubmitRequest(&submitRequest);



    }

(vendor\qcom\proprietary\chi-cdk\core\chiframework)




     CHX_INLINE CDKResult CheckAndActivatePipeline(){



         //ActivatePipeline一般一个Feature 一个Pipeline，MFNR 有多个Pipeline




         result = ExtensionModule::GetInstance()->ActivatePipeline();



     }

(vendor\qcom\proprietary\chi-cdk\core\chiframework)




    CDKResult ExtensionModule::ActivatePipeline()



    {



        return g_chiContextOps.pActivatePipeline();



    }

(vendor\qcom\proprietary\camx\src\core\chi)




    static CDKResult ChiActivatePipeline(){



    



        result = pChiContext->ActivatePipeline();



    



    }

(vendor\qcom\proprietary\camx\src\core\chi)




    CamxResult ChiContext::ActivatePipeline(){



 



     result = pChiSession->StreamOn();



    



    }

(vendor\qcom\proprietary\camx\src\core)




    CamxResult Session::StreamOn(){



    



         result = pPipeline->StreamOn();



    



    }

(vendor\qcom\proprietary\camx\src\core)




    CamxResult Pipeline::StreamOn(){



    



        result = m_pChiContext->GetHwContext()->StreamOn();



        



        



    }

(vendor\qcom\proprietary\camx\src\core)




    CamxResult HwContext::StreamOn(){



        result = CSLStreamOn();



    



    }

(vendor\qcom\proprietary\camx\src\csl)




    CamxResult CSLStreamOn(){



    



        pJumpTable->CSLStreamOn();



    



    }

(vendor\qcom\proprietary\camx\src\csl\hw)




 



    CamxResult CSLStreamOnHW(){



    



        result = CSLHwStreamOnKMDHardwares();



    



    }

(vendor\qcom\proprietary\camx\src\csl\hw)




    CamxResult CSLHwStreamOnKMDHardwares(){



    



        result = pHWDevice->();



    }

然后返回执行的CameraUsecaseBase::ExecuteCaptureRequest方法




    CDKResult AdvancedCameraUsecase::ExecuteCaptureRequest(){



    



    



        if(TRUE == AdvancedFeatureEnabled()){



         result = pFeature->ExecuteProcessRequest(pRequest);



        }else{



        



        // 没有任何Feature 执行的流程




         result = CameraUsecaseBase::ExecuteCaptureRequest(pRequest);



        }



    }



    



    



    CDKResult CameraUsecaseBase::ExecuteCaptureRequest(){



        // 没有任何Feature 执行的流程




        CheckAndActivatePipeline(m_sessions[session].pSession);



        //Chxusecase .cpp  




        result = SubmitRequest(&submitRequest);



    }

(vendor\qcom\proprietary\chi-cdk\core\chiframework)




    CDKResult Usecase::SubmitRequest(){



         //




         result = ExtensionModule::GetInstance()->SubmitRequest



    }

(vendor\qcom\proprietary\chi-cdk\core\chiframework)




    CDKResult ExtensionModule::SubmitRequest(){



        result = g_chiContextOps.pSubmitPipelineRequest();



    }

(vendor\qcom\proprietary\camx\src\core\chi)




    static CDKResult ChiSubmitPipelineRequest(){



    



    



        result = pChiContext->SubmitRequest();



    }

(vendor\qcom\proprietary\camx\src\core\chi)




    CamxResult ChiContext::SubmitRequest(){



    



         result = pSession->Proce*tureRequest();



    }

(vendor\qcom\proprietary\camx\src\core)




    CamxResult Session::Proce*tureRequest(){



    



     // 暂未找到跳转到ProcessRequest 的地方 




    



    }



    



    CamxResult Session::ProcessRequest(){



    



        result = m_pipelineData[].pPipeline->OpenRequest();



        //




        result = m_pipelineData[].pPipeline->ProcessRequest();



    }

(vendor\qcom\proprietary\camx\src\core)




    CamxResult Pipeline::ProcessRequest(){



         m_ppOrderedNodes[nodeIndex]->SetupRequest();



         



         result = m_pDeferredRequestQueue->AddDeferredNode();



         // Consider any nodes now ready




         m_pDeferredRequestQueue->DispatchReadyNodes();



    }

(vendor\qcom\proprietary\camx\src\core)




    VOID DeferredRequestQueue::DispatchReadyNodes(){



      ... ...



    }

CamxRequest流程

参考文章
:///sinat_22657459/article/details/92380466
:///TaylorPotter/article/details/105630341

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