MTK MFNR 学习笔记

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、MFNR 简介
二、MFNR 开关与决策
三、MFNR 相关的adb 命令
四、MFNR log 分析
五 参考文献

一、MFNR 简介

MFNR : Multiple Frame Noise Reduction
MFLL : Multiple Frame Low Light
BSS : Best Select Shot

MFNR 跟 MFLL 是两个功能一致，名称不同的简称，是MTK 推出的YUV domain 多帧降噪的算法。

MFNR 是在 P2_CaputureNode 中 CaptureFeaturePipe 的路径，多帧的raw 首先在 rootnode 中做 bss，同时会做 recorder 动作，然后依次进入到 P2ANode 做 raw2yuv ，产生的yuv等image，送到 MultiFrameNode（挂载 MFNR 算法）中进行多帧降噪处理，产生一张降噪后的YUV；如果还挂在其他的单帧YUV算法，则送YUVNode 处理，最终送到MDPNode 做crop ，resize处理；
大致流程如下：
Raws–> RootNode(BSS)–>Raws–>P2A(Raw2Yuv)–>YUVs–>MultiFrameNode(MFNR)–>YUV–>YUVNode–>YUV–>MDPNode–>Yuv

二、MFNR 开关与决策

2.1 MFNR 开关设置

开关控制在：MTK_CAM_MFB_SUPPORT
代码路径：
/device/*/ProjectConfig.mk
如果支持，默认建议设置为 3
MTK_CAM_MFB_SUPPORT =3

 0: 关 MFLL 
 1：开 MFLL
 2： 开 AIS 
 3： 开 MFLL 和AIS

• 1. 不支持MFNR时，请在 app 中设置

MTK_MFNR_FEATURE_MFB_MODE 为 MTK_MFNR_FEATURE_MFB_OFF

• 2.支持MFNR 时，请在 app 中设置

MTK_MFNR_FEATURE_MFB_MODE 为 MTK_MFNR_FEATURE_MFB_AUTO，由 CUST_MFLL_AUTO_MODE 决策走哪个模式

• 3. 当支持AIS时，可以使用下面二者任一种

1.MTK_MFNR_FEATURE_AIS_MODE = MTK_MFNR_FEATURE_AIS_ON
2.MTK_MFNR_FEATURE_MFB_MODE = MTK_MFNR_FEATURE_MFB_AIS

• 4.当前面的meta确认为非 OFF 状态，则去判断tuning设置的threshold 是否满足，(mfll_iso_th 决策是否走MFNR)。

三、MFNR 相关的adb 命令

1.强制开、关 MFNR

adb shell setprop vendor.mfll.force 1 // 开 ：1 、 关：0

2. dump MFNR 各阶段的图片

adb shell setprop vendor.mfll.dump.all 1
路径：/data/vendor/camera_dump

3.开MFNR 的log

adb shell setprop vendor.mfll.log_level 3

4.dump MFNR 需要的RaW　跟YUV 图

adb shell setprop vendor.debug.camera.p2.dump 1

5.dump bss 之前的RAW和RRZO

adb shell setprop vendor.debug.camera.bss.dump 1

四、MFNR log 分析

Log 关键字

log关键字：
MFNRPlugin|capture req|capture intent: 2|connect call|MfllCore

connect call|capture req|capture intent: 2|mfll_iso_th.*enablemfb|Mfll apply.*frames|Collected Selection|capture request frames count|BSS output|skip frame count|allocate memory|times to blend|funcprocessMemc|process.*collected request|doMsBlending|process.*callback request

// 水印相机
04-10 16:41:04.080150  1422  8639 I CameraService: CameraService::connect call (PID 8414 "com.tencent.zebra", camera ID 0) and Camera API version 1
// capture req#:92  capture intent: 2  第 92 帧 请求拍照
04-10 16:41:09.544396  1478  9201 D mtkcam_hal_android.device: [capture intent: 2] +  ULog#158932
04-10 16:41:09.544453  1478  9201 D mtkcam_hal_android.device: [ASettingRuleHelper::updateLogicalSetting] capture intent: 2
04-10 16:41:09.544487  1478  9201 D mtkcam_hal_android.device: [capture intent: 2] -  ULog#158933
04-10 16:41:09.545722  1478  9201 I mtkcam-FeatureSettingPolicy: [collectCaptureInfo] (0xb400007a86f4af30) capture req#:92
04-10 16:41:09.548862  1478  9201 D MFNRPlugin: (9201)[negotiate] Collected Selection:(0/0), ISP mode: 0, sensorId:0, Req(92)

//  origin_iso:838 但前预览iso
//  mfll_iso_th:100 多帧 iso 决策 ，
//  enableMfb:1 开启 mfll 
//  frameCapture:4 多帧拍照张数4张
04-10 16:41:09.549907  1478  9201 I MfllCore/Strategy: {Mfll}[queryStrategy] iso:838, origin_iso:838, mfll_iso_th:100, downscale(enabled:0, ratio:0, 16/16), finalCfg(enableMfb:1, frameCapture:4), postrefine(nr:1, mfb:1), aevc(ae:0, lcso:0)
04-10 16:41:09.550055  1478  9201 D MFNRCapability_Basic: (9201)[updateSelection] Mfll apply = 1, frames = 4
04-10 16:41:09.550410  1478  9201 D MFNRPlugin: (9201)[negotiate] Collected Selection:(1/0), ISP mode: 0, sensorId:0, Req(92)
04-10 16:41:09.550512  1478  9201 D MFNRCapability_Basic: (9201)[updateSelection] Mfll apply = 1, frames = 4
04-10 16:41:09.550784  1478  9201 D MFNRPlugin: (9201)[negotiate] Collected Selection:(2/0), ISP mode: 0, sensorId:0, Req(92)
04-10 16:41:09.550857  1478  9201 D MFNRCapability_Basic: (9201)[updateSelection] Mfll apply = 1, frames = 4
04-10 16:41:09.551145  1478  9201 D MFNRPlugin: (9201)[negotiate] Collected Selection:(3/0), ISP mode: 0, sensorId:0, Req(92)
04-10 16:41:09.551218  1478  9201 D MFNRCapability_Basic: (9201)[updateSelection] Mfll apply = 1, frames = 4

// evaluateCaptureSetting 拍照决策 mainFrame:1   subFrames:3
//BSS output  BSS 选帧
04-10 16:41:09.552314  1478  9201 D mtkcam-FeatureSettingPolicy: [evaluateCaptureSetting] capture request frames count(mainFrame:1, preCollectFrames:0, subFrames:3)
04-10 16:41:09.555439  1478  9201 D mtkcam-CaptureInFlightRequest: [insertRequest] insert capture RequestNo 92, size #:1
04-10 16:41:09.777355  1478  9373 D BssCore : (9373)[postPrepareRequests] MTK_FEATURE_BSS_PROCESS = 0, BSS output(enable bss:1) - order(0)
04-10 16:41:09.777365  1478  9373 D BssCore : (9373)[postPrepareRequests] MTK_FEATURE_BSS_PROCESS = 0, BSS output(enable bss:1) - order(3)
04-10 16:41:09.777373  1478  9373 D BssCore : (9373)[postPrepareRequests] MTK_FEATURE_BSS_PROCESS = 0, BSS output(enable bss:1) - order(1)
04-10 16:41:09.777379  1478  9373 D BssCore : (9373)[postPrepareRequests] MTK_FEATURE_BSS_PROCESS = 0, BSS output(enable bss:1) - order(2)

// BSS: skip frame  过BSS 算法 skip的张数
04-10 16:41:09.778173  1478  9373 I MtkCam/CapturePipe/RootNode: [reorder]BSS: skip frame count: 0, golden:0

// allocate memory 分配内存
04-10 16:41:09.820663  1478  9505 D MfllCore: {Mfll}[operator()] future allocate memory +

// collected request(0/4) MFNR 收到帧的张数
04-10 16:41:09.821332  1478  9379 D MFNRPlugin: (9379)[process] collected request(0/4)
04-10 16:41:09.821347  1478  9508 D MfllCore: {Mfll}[operator()] times to blend(3), MEMC instanceNum(1), threadsNum(1)
04-10 16:41:09.821375  1478  9508 D MfllCore: {Mfll}[operator()] funcProcessMemc(0) +
04-10 16:41:09.841445  1478  9379 D MFNRPlugin: (9379)[process] collected request(1/4)
04-10 16:41:09.847348  1478  9505 D MfllCore: {Mfll}[operator()] future allocate memory -
04-10 16:41:09.863183  1478  9379 D MFNRPlugin: (9379)[process] collected request(2/4)
04-10 16:41:09.886023  1478  9379 D MFNRPlugin: (9379)[process] collected request(3/4)

// memc 过完
04-10 16:41:09.913152  1478  9508 D MfllCore: {Mfll}[operator()] funcProcessMemc(0) -
04-10 16:41:09.913241  1478  9508 D MfllCore: {Mfll}[operator()] funcProcessMemc(1) +
04-10 16:41:09.920605  1478  9508 D MfllCore: {Mfll}[operator()] funcProcessMemc(1) -
04-10 16:41:09.920615  1478  9508 D MfllCore: {Mfll}[operator()] funcProcessMemc(2) +
04-10 16:41:09.927396  1478  9508 D MfllCore: {Mfll}[operator()] funcProcessMemc(2) -

//doMsBlending 多帧融合
04-10 16:41:09.950564  1478  9510 D MfllCore: {Mfll}[doMsBlending] blending (0) ok
04-10 16:41:09.950575  1478  9510 D MfllCore: {Mfll}[doMsBlending] re-use input base buffer for 2nd blend
04-10 16:41:09.975629  1478  9510 D MfllCore: {Mfll}[doMsBlending] blending (1) ok
04-10 16:41:10.008877  1478  9510 D MfllCore: {Mfll}[doMsBlending] use working buffer as output
04-10 16:41:10.053627  1478  9510 D MfllCore: {Mfll}[doMsBlending] blending (2) ok
04-10 17:19:21.915968 13594 15334 D MfllCore: {Mfll}[doMsBlending] blending (4) ok

// callback request 依次 callback 每一帧
04-10 16:41:10.053840  1478  9379 D MFNRPlugin: (9379)[process] callback request(0/4) 0xb4000079471651a8
04-10 16:41:10.054679  1478  9379 D MFNRPlugin: (9379)[process] callback request(1/4) 0xb4000079471651a8
04-10 16:41:10.055064  1478  9379 D MFNRPlugin: (9379)[process] callback request(2/4) 0xb4000079471651a8
04-10 16:41:10.055407  1478  9379 D MFNRPlugin: (9379)[process] callback request(3/4) 0xb4000079471651a8

五 参考文献

MTK文档

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