第14讲 从CameraServer角度详解Camera启动性能 - Android Camera性能分析

本讲是Android Camera性能分析专题的第14讲,我们介绍从CameraServer角度详解Camera启动性能,包括如下内容:

  1. 从CameraServer角度详解Camera启动性能
  2. CameraServer核心函数流程拆解

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从CameraServer角度详解Camera启动性能

模块 开始点 结束点
App 点击Camera App Icon 开始调用connectDevice
HAL 开始调用connectDevice 调用connectDevice结束
App 调用connectDevice结束 开始调用endConfigure
HAL 开始调用endConfigure 调用endConfigure结束
App 调用endConfigure结束 调用submitRequestList
HAL 调用submitRequestList CameraServer收到第一帧

CameraServer核心函数流程拆解

getCameraCharacteristics

1.shouldRejectSystemCameraConnection
2.getCameraCharacteristicsLocked // 从CameraProviderManager中获取CameraCharacteristics
3.getCameraCharacteristics::checkPermission

getCameraCharacteristics

connectDevice

会调用到HAL的CameraHal::openSession

1.validateConnectLocked
2.CameraDeviceClient::initializeImpl
      Camera2ClientBase::initializeImpl
            Camera3Device::initialize
                CameraHal::openSession
3.finishConnectLocked

connectDevice

createDefaultRequest

会调用到HAL的CameraHal::constructDefaultRequestSettings

1.CameraDeviceClient::createDefaultRequest
    Camera3Device::createDefaultRequest
        CameraHal::constructDefaultRequestSettings

createDefaultRequest

beginConfigure

CameraDeviceClient::beginConfigure //Not implemented yet

createStream

核心在创建 Camera3OutputStream

CameraDeviceClient::createStream
    SessionConfigurationUtils::createSurfaceFromGbp
        query(width,height,format,dataspace)
    Camera3Device::createStream
        new Camera3OutputStream
    setStreamTransformLocked

createStream

endConfigure

会调用到HAL的CameraHal::configureStreams

CameraDeviceClient::endConfigure
    Camera3Device::configureStreams
        Camera3Stream::startConfiguration
        CameraHal::configureStreams
        Camera3Stream::finishConfiguration
        Boost priority of request thread to SCHED_FIFO

endConfigure

submitRequestList

CaptureRequest送下来后会等待Active

CameraDeviceClient::submitRequestList
    Camera3Device::setStreamingRequestList
        Camera3Device::RequestThread::setRepeatingRequests
        Camera3Device::waitUntilStateThenRelock

submitRequestList

Request thread线程开始给HAL送Request,调用 CameraHal::processBatchCaptureRequests

Camera3Device::RequestThread::threadLoop
    Camera3Device::RequestThread::waitForNextRequestBatch
    Camera3Device::RequestThread::prepareHalRequests
    Camera3Device::RequestThread::sendRequestsBatch
        CameraHal::processBatchCaptureRequests

sendRequestsBatch

StatusTracker通知status变化:

Camera3Device::notifyStatus
    Camera3Device::internalUpdateStatusLocked
        mStatusChanged.broadcast
        Camera2ClientBase<TClientBase>::notifyActive
            CameraService::BasicClient::startCameraStreamingOps

startCameraStreamingOps

Stream 0: first full buffer

HAL回调processCaptureResult后,如果有Buffer,则取出来 queueBuffer给 Consumer

Camera3Device::processCaptureResult
  Camera3OutputUtils::returnAndRemovePendingOutputBuffers
    Camera3OutputUtils::returnOutputBuffers
      Camera3Stream::returnBuffer
        Camera3OutputStream::returnBufferLocked
          Camera3IOStreamBase::returnAnyBufferLocked
            Camera3OutputStream::returnBufferCheckedLocked
              Camera3OutputStream::queueBufferToConsumer

Stream 0: first full buffer

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