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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:

一、Systrace 拆解概览
二、Systrace 阶段拆解详解

一、Systrace 拆解概览

MTK Camera 照片切换视频trace 拆解(非切换摄像头类)

照片切换视频	模块	trace 关键字
S0	Camera APP	deliverInputEvent ⇒ abortCaptures/CameraHal::flush 开始
S1	Camera HAL	abortCaptures/CameraHal::flush
S2	Camera APP	abortCaptures/CameraHal::flush 结束 ⇒ CameraHal::configureStreams start
S3	Camera HAL	CameraHal::configureStreams
S4	Camera APP	CameraHal::configureStreams end ⇒ setRepeatingRequest start
S5	Camera HAL	setRepeatingRequest start ⇒ first full buffer
S6	Camera APP、SF	first full buffer ⇒ 第一帧显示(onPreviewOk)

二、Systrace 阶段拆解详解

2.1 点击照片模式切换视频模式

S0 deliverInputEvent ⇒ abortCapture/CameraHal::flush 开始

Camera 响应点击事件开始abortCapture

Camera 响应点击事件开始abortCapture

Systrace 关键字：
Camera app 点击照片切换视频模式响应：deliverInputEvent
Camera app 下发停止预览请求：abortCaptures
Camera FWK 响应abortcapture 的处理： flush 、CameraHal::flush

S1 abortCaptures/CameraHal::flush

CameraHAL 响应flush的流程

CameraHAL 响应flush的流程

StreamingNode flush

Systrace 关键字：
StreamingNode::flush
P2_Dispatch:notifyFlush()
P2_Streaming:notifyFlush()

P2_Dispatch:waitFlush()
P2_Streaming:waitFlush()

CaptureNode flush

Systrace 关键字：
CaptureNode::flush
P2_Capture:notifyFlush()
P2_Capture:waitFlush()

S2 abortCaptures/CameraHal::flush 结束 ⇒ CameraHal::configureStreams start

初始化videomode,MediaRecorder ，prepare MediaRecorder

初始化videomode,MediaRecorder ，prepare MediaRecorder

Systrace 关键字：
videoMode.doInitMode
AIDL::cpp::ICameraService::getNumberOfCameras::cppClient

videoMode.mediaRecorderinit
videoMode.mediaRecorderPrepare

Camera APP通过bind 跟mediaserver 进行通讯，并创建createRecord

createRecord 实例

image.png

AIDL::cpp::IAudioFlingerService::createRecord::cppClient

S3 CameraHal::configureStreams

configureStreams 概览

configureStreams 概览

Systrace 关键字：
createCaptureSession
endConfigure
configureStreams
configureStreamsLocked
CameraHal::configureStreams

Delete3路照片流

Delete3路照片流

Systrace 关键字：
deleteStream
disconnect
freeBuffer

创建3路视频流

创建3路视频流

Systrace 关键字：
AIDL::cpp::ICameraDeviceUser::createStream::cppServer
createStream

Camera HAL CaptureNode ，StreamNode uninit

Camera HAL CaptureNode ，StreamNode uninit

Systrace 关键字：
StreamingNode::flush
CaptureNode::flush
CaptureNode::uninit
StreamingNode::uninit

StreamingNode flush && CaptureNode flush

StreamingNode flush && CaptureNode flush

StreamingNode flush

Systrace 关键字：
StreamingNode::flush
P2_Dispatch:waitFlush()
P2_Streaming:waitFlush()
P2_Dispatch:notifyFlush()
P2_Streaming:notifyFlush()

CaptureNode flush

Systrace 关键字：
CaptureNode::flush
P2_Capture:waitFlush()
P2_Capture:notifyFlush()

CaptureNode uninit &&StreamingNode uninit

CaptureNode uninit &&StreamingNode uninit

CaptureNode uninit

CaptureNode::uninit
P2_Capture:uninit()

StreamingNode uninit

StreamingNode::uninit
P2_Dispatch:uninit()
P2_Streaming:uninit()
releaseGeneralPipe
uninit
uninitPool
fpipe.p2g.fullImg.destroy
~GraphicBuffer
free
freeBuffer
TPI uninit
uninitHalISP
StreamingNode::uninitLock
uninit3DNR
uninitDsdnPools
releaseBuffer
fpipe.fullImg.destroy
uninitNodes
uninitSMVR

Camera HAL 决策配流Feature evaluateConfiguration

Camera HAL 决策配流Feature evaluateConfiguration

Systrace 关键字：
configureStreams
eatureSettingPolicy::evaluateConfiguration
evaluateCaptureConfiguration
updateStreamConfiguration

为申请的3路视频流申请buffers

为申请的3路视频流申请buffers

Systrace 关键字：
configureStreams
initProducer-Hal:Image:FD
initProducer-Hal:Image:P1:Resizeraw_main1
initProducer-Hal:Image:STT_main1
allocateBuffers
endConfigure dump

Camera FWK 配流结束 finishConfiguration

配流结束 finishConfiguration

Systrace 关键字：
endConfigure
finishConfiguration

Camera FWK 配流结束 finishConfiguration 的同时 FdNode init

,StreamNode init,CaptureNode init

Camera FWK 配流结束 finishConfiguration 的同时 FdNode init ,StreamNode init,CaptureNode init

Systrace 关键字：
finishConfiguration
FdNode init
StreamingNode::init
CaptureNode::init
submitRequestList

StreamingNode::init

StreamingNode::init

Systrace 关键字：
StreamingNode::init
P2_Dispatch:init()
P2_Streaming:FeaturePipe create
prepareGeneralPipe
P2_Streaming:FeaturePipe init
TPI init_config

CaptureNode::init && config

CaptureNode::init && config

Systrace 关键字：
CaptureNode::init
P2_Capture:init()
P2_Capture:FeaturePipe create & init
CaptureNode::config
P2_Capture:config()

S4：CameraHal::configureStreams 结束 -->submitRequestList

CameraHal::configureStreams 结束 -->submitRequestList 下发预览请求 trace TAG

CameraHal::configureStreams 结束 -->submitRequestList

submitRequestList 下发预览请求

submitRequestList 下发预览请求

Sysrace TAG:
AIDL::cpp::ICameraDeviceUser::submitRequestList::cppServer
submitRequestList
setStreamingRequestList
submitRequestsHelper
setRepeatingRequests

S5：submitRequestList --> first full buffer

第一帧预览请求

第一帧预览请求 Trace

第一帧预览请求的trace

Camera FWK trace TAG：
sendRequestsBatch
CameraHal::processBatchCaptureRequests
frame capture

Camera HAL trace TAG：
processCaptureRequest

第一帧出图callback 请求

第一帧出图定位： callback Camera FWK 关键trace TAG

和你一起终身学习，这里是程序员Android

Trace TAG:
processCaptureResults
Stream 0: first full buffer

第一帧出图callback Camera HAL --> Camera FWK -->Camera APP

第一帧出图callback Camera HAL --> Camera FWK -->Camera APP

第一帧callback 流程（Camera HAL -->Camera FWK）

第一帧callback 流程（Camera HAL -->Camera FWK）

第一帧出图callback Camera HAL trace TAG
processCaptureResult
第一帧出图callback Camera FWK 关键 trace TAG：first full buffer
Stream 0: first full buffer
frame capture

第一帧callback 流程（Camera FWK -->Camera APP）

第一帧callback 流程（Camera FWK -->Camera APP）

Camera APP trace TAG:
SurfaceTexture

S6： first full buffer ⇒ 第一帧显示(onPreviewOk)

第一帧callback 流程（Camera APP -->SurfaceFliger 送显示）

第一帧callback 流程（Camera APP -->SurfaceFliger 送显示）

SF 显示trace TAG：
surfaceflinger
vsync-sf
BufferTx
Fence

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