MTK 多帧拍照流程分析

MTK多帧拍照流程全面解析

最新推荐文章于 2025-08-06 07:55:25 发布

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最新推荐文章于 2025-08-06 07:55:25 发布 · 1.2k 阅读

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和你一起终身学习，这里是程序员Android

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、多帧拍照请求概览
二、多帧拍照回帧概览

一、多帧拍照请求概览

多帧拍照请求概览如下：

多帧拍照请求

1.1 APP 下发拍照请求到 Camera Framework

1.1.1 Trace关键字如下：

APP:
deliverInputEvent: app 点击事件处理
CameraUnitCamera2ImplTakePicture： app 下发拍照请求
binder transaction ：通过bind 跟FWK交互

FWK:
binder reply ：响应app 下发的bind
submitRequestList：Camera FWK提交拍照请求给HAL，并包含拍照帧数
captureList
submitRequestsHelper
createCaptureRequest :比如多帧会下发4 帧
queueRequestList
unpauseForNewRequests:暂停新的拍照请求

1.1.2 详细请看下面trace 截图

1.1.3 下发4帧请求createCaptureRequest

请求4帧

1.2 Camera Framework下发拍照请求到 camera HAL中

1.2.1 Trace关键字如下：

FWK:
sendRequestsBatch:Camera FWK 下发批处理请求
CameraHal::processBatchCaptureRequests： Camera FWK 每帧请求到HAL
HIDL::ICameraDeviceSession::processCaptureRequest_3_4::client： Camera 向Camera HAL请求一帧
binder transaction

CAM HAL：
binder reply
HIDL::ICameraDeviceSession::processCaptureRequest_3_4::server ：Camera HAL接受处理Camera FWK 请求
processCaptureRequest_3_4
processCaptureRequest
submitOneRequest
onRequest_EvaluateRequest
evaluateRequest
FeatureSettingPolicy::evaluateRequest
evaluateCaptureSetting
negotiate
onRequest_ProcessEvaluatedFrame
processEvaluatedFrame
onProcessEvaluatedFrame
submitZslRequest：Camera HAL 提交拍照请求帧
makePipelineFrame
queue|requestNo:97 frameNo:97
onFrameUpdated

1.2.2 详细请看下面trace 截图

1.2.3 拍照log关键字：

control.captureIntent:2|capture req#
拍照log 如下：

01-02 09:05:10.695442  1161  1642 I mtkcam-PipelineModelSession: [submitRequest] <Default/1> requestNo:94 { repeating:0 control.aeTargetFpsRange:5,30 control.captureIntent:2 control.enableZsl:1 control.processRawEn:0 control.mode:1 control.sceneMode:0 control.videoStabilizationMode:0 edge.mode:2 }
01-02 09:05:10.695560  1161  1642 I mtkcam-FeatureSettingPolicy: [evaluateCaptureSetting] (0xb4000075a3a43020) capture req#:94
01-02 09:05:10.734815  1161  1642 I mtkcam-PipelineModelSession: [submitRequest] <Default/1> requestNo:95 { repeating:0 control.aeTargetFpsRange:5,30 control.captureIntent:2 control.enableZsl:1 control.processRawEn:0 control.mode:1 control.sceneMode:0 control.videoStabilizationMode:0 edge.mode:2 }
01-02 09:05:10.734937  1161  1642 I mtkcam-FeatureSettingPolicy: [evaluateCaptureSetting] (0xb4000075a3a43020) capture req#:95
01-02 09:05:10.770126  1161  1645 I mtkcam-PipelineModelSession: [submitRequest] <Default/1> requestNo:96 { repeating:0 control.aeTargetFpsRange:5,30 control.captureIntent:2 control.enableZsl:1 control.processRawEn:0 control.mode:1 control.sceneMode:0 control.videoStabilizationMode:0 edge.mode:2 }
01-02 09:05:10.770526  1161  1645 I mtkcam-FeatureSettingPolicy: [evaluateCaptureSetting] (0xb4000075a3a43020) capture req#:96
01-02 09:05:10.795720  1161  1645 I mtkcam-PipelineModelSession: [submitRequest] <Default/1> requestNo:97 { repeating:0 control.aeTargetFpsRange:5,30 control.captureIntent:2 control.enableZsl:1 control.processRawEn:0 control.mode:1 control.sceneMode:0 control.videoStabilizationMode:0 edge.mode:2 }
01-02 09:05:10.795846  1161  1645 I mtkcam-FeatureSettingPolicy: [evaluateCaptureSetting] (0xb4000075a3a43020) capture req#:97
01-02 09:05:10.958217  1161  1642 I mtkcam-Fea