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相机闪光灯拍照流程分析

article 2025/2/19 8:40:48

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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、Flash 基础知识
二、MTK 闪光灯拍照log分析

一、Flash 基础知识

1.1 Flash HAL 场景枚举值

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Flash HAL 场景枚举值

1.2 AE AF mode State 枚举值

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AE AF mode State 枚举值

1.3 AWB mode State 枚举值

acc20a88ca7fbf57b1e0f73ccf821a3d.jpeg
AWB mode State 枚举值

二、MTK 闪光灯拍照log分析

2.1 log关键字

connect call|AppMgr-configureStreams|AppMgr-ResCbHelper::performCallback\] requestNo:0|Frame timer \[# 1/|convertCallbackParcelToHidl\] requestNo:0|evaluateCaptureSetting|capture req#|setduty|setonoff|setFlashO|takePicture|onShutterButtonClick|submitRequest.*control.captureIntent:2|submitRequest.*requestNo:0|MTK_CONTROL_AF_TRIGGER|MTK_CONTROL_AE_PRECAPTURE_TRIGGER|Backup|Precapture Trigger|AEPrecaptureStart|endPrecapture|doCapAE|CaptureNode.*queue|CaptureProcessor.*onEnque|CaptureProcessor.*onContinue|CaptureProcessor.*notifyRelease|Open with FUSE

2.2 MTK Camera log 分析

2.2.1 闪光灯第一次打闪：预闪
852a67b590772576d861f9aa7baed189.jpeg
预闪备份2A
2.2.2 闪光灯第二次打闪：主闪
ab1991c20560e3c36680245960a561e5.jpeg
主闪存图
2.2.3 MTK camera 闪光灯拍照 log

MTK 相机on 状态下，闪光灯拍照走预闪，主闪流程。

// 相机调用
    02-10 11:20:30.671910  1001 26533 I CameraService: CameraService::connect call (PID 26709 "com.mediatek.camera", camera ID 0) and Camera API version 2
    //预览、拍照、缩略图尺寸
    02-10 11:20:30.852660  4720  5025 D mtkcam-AppStreamMgr: [AppMgr-configureStreams]  0 1920x1080 OUT ImgFormat:0x11(NV21) BufPlanes(strides/sizeInBytes):[ 1920/2073600 1920/1062720 ] startOffset:0 bufStep:0 t:0/r:0 maxBuffers:12 d/s:0x00000000(UNKNOWN) s0:d0:App:YCrCb_420_SP:0|HW_TEXTURE AllocImgFormat:0x11(NV21) AllocBufPlanes(strides/sizeInBytes):[ 1920/2073600 1920/1062720 ] Real:0x11(YCrCb_420_SP) Request:0x22(IMPLEMENTATION_DEFINED) Override:0x11(YCrCb_420_SP) Hal-Client-usage:0x100(0|HW_TEXTURE) Hal-usage:0x20033(0|SW_READ_OFTEN|SW_WRITE_OFTEN|HW_CAMERA_WRITE) HalStream::(consumer/producer)Usage:0/0x20033 0xb400007a43dcde50 phy:-1
    02-10 11:20:30.852684  4720  5025 D mtkcam-AppStreamMgr: [AppMgr-configureStreams]  0x1 4080x2296 OUT ImgFormat:0x2300(JPEG) BufPlanes(strides/sizeInBytes):[ 14461181/14461184 ] startOffset:0 bufStep:0 t:0/r:0 maxBuffers:11 d/s:0x08c20000(V0_JFIF|STANDARD_BT601_625|TRANSFER_SMPTE_170M|RANGE_FULL) s1:d0:App:BLOB:0|SW_READ_OFTEN AllocImgFormat:0x21(BLOB) AllocBufPlanes(strides/sizeInBytes):[ 14461181/14461184 ] Real:0x21(BLOB) Request:0x21(BLOB) Override:0x21(BLOB) Hal-Client-usage:0x3(0|SW_READ_OFTEN) Hal-usage:0x20033(0|SW_READ_OFTEN|SW_WRITE_OFTEN|HW_CAMERA_WRITE) HalStream::(consumer/producer)Usage:0/0x20033 0xb400007a43dce8d0 phy:-1
    02-10 11:20:30.852710  4720  5025 D mtkcam-AppStreamMgr: [AppMgr-configureStreams]  0x2  160x96   OUT ImgFormat:0x11(NV21) BufPlanes(strides/sizeInBytes):[ 192/18432 192/9504 ] startOffset:0 bufStep:0 t:0/r:0 maxBuffers:12 d/s:0x08c20000(V0_JFIF|STANDARD_BT601_625|TRANSFER_SMPTE_170M|RANGE_FULL) s2:d0:App:YCrCb_420_SP:0|SW_READ_OFTEN AllocImgFormat:0x11(NV21) AllocBufPlanes(strides/sizeInBytes):[ 192/18432 192/9504 ] Real:0x11(YCrCb_420_SP) Request:0x23(YCbCr_420_888) Override:0x23(YCbCr_420_888) Hal-Client-usage:0x3(0|SW_READ_OFTEN) Hal-usage:0x20033(0|SW_READ_OFTEN|SW_WRITE_OFTEN|HW_CAMERA_WRITE) HalStream::(consumer/producer)Usage:0/0x20033 0xb400007a43d9f310 phy:-1
    //第一帧请求 requestNo:0 第一帧  control.captureIntent:1 行为为预览
    02-10 11:20:31.076045  4720  5025 I mtkcam-PipelineModelSession: [submitRequest] <4Cell/0> requestNo:0 { repeating:0 control.aeTargetFpsRange:10,30 control.captureIntent:1 control.enableZsl:0 control.processRawEn:0 control.mode:1 control.sceneMode:0 control.videoStabilizationMode:0 edge.mode:1 }
    //第一帧出图
    02-10 11:20:31.232717  4720 26780 D MtkCam/StreamingPipe/Timer: [print]Frame timer [#    1/   0][t  47][io   0][tof  0/  0][d  0/  0][mss  0/  0/  0/  0][a 47/ 24/ 22][tun  0/  0][msf  0/  0][vnr  0/  0/  0][am  0][b  0/  0][tpi(  0/  0)/(  0/  0)/(  0/  0)][vmdp_A  0/  0 vmdp_B  0/  0][h  3/  0/  0][e  0][r  0/  0][w_A  0/  0/  0/  0 w_B  0/  0/  0/  0][x  0][disp  0/  0][async  0/  0][p2sm  0/  0/  0][fps0.00/0.00/ 10/ 30]
    //第一帧callback image && meta
    02-10 11:20:31.234330  4720 26736 D mtkcam-AppStreamMgr: [0-CallbackHandler::convertCallbackParcelToHidl] requestNo:0 o:image#:1
    02-10 11:20:31.234601  4720 26735 D mtkcam-AppStreamMgr: [0:AppMgr-ResCbHelper::performCallback] requestNo:0 o:image#:1
    02-10 11:20:31.234619  4720 26735 D mtkcam-AppStreamMgr: [0:AppMgr-ResCbHelper::performCallback] requestNo:0
    02-10 11:20:31.320917  4720 26736 D mtkcam-AppStreamMgr: [0-CallbackHandler::convertCallbackParcelToHidl] requestNo:0 o:meta#:4
    02-10 11:20:31.321192  4720 26735 D mtkcam-AppStreamMgr: [0:AppMgr-ResCbHelper::performCallback] requestNo:0 o:meta#:1
    02-10 11:20:31.321293  4720 26735 D mtkcam-AppStreamMgr: [0:AppMgr-ResCbHelper::performCallback] requestNo:0
    //预闪 AE AF tag  MTK_CONTROL_AE_PRECAPTURE_TRIGGER
    02-10 11:20:33.500835  4720  5014 D Hal3Av3 : [parseMeta] MTK_CONTROL_AE_PRECAPTURE_TRIGGER(0 -> 1)
    02-10 11:20:33.500874  4720  5014 D Hal3Av3 : [parseMeta] MTK_CONTROL_AF_TRIGGER(0 -> 1)
    02-10 11:20:33.500897  4720  5014 D Hal3Av3 : [parseMeta] MTK_CONTROL_AF_TRIGGER_ID(1)
    02-10 11:20:33.540439  4720 26740 D Hal3Av3 : [setNormal] Precapture Trigger @ i4MagicNum(62)
    02-10 11:20:33.540502  4720 26740 W TaskMgr : [sendEvent] AEPrecaptureStart, fgLampflashCond(1)
    02-10 11:20:33.541150  4720 25786 D Hal3Av3 : [parseMeta] MTK_CONTROL_AE_PRECAPTURE_TRIGGER(1 -> 0)
    02-10 11:20:33.541199  4720 25786 D Hal3Av3 : [parseMeta] MTK_CONTROL_AF_TRIGGER(1 -> 0)
    // 2A backup doBackupAE AWB
    02-10 11:20:33.546911  4720 26740 D ae_mgr  : [doBackupAE()+] i4SensorDev:1
    02-10 11:20:33.546930  4720 26740 D ae_mgr  : [doBackupAE()-] i4SensorDev:1 m_rAESettingBackup.EvSetting:39998/5904/4100 (ISO:144) m_rAESettingBackup.u4Index/F:111/335 (IndexBase:3)Pre-flash:0 
    02-10 11:20:33.565240  4720 26740 D awb_mgr : [backup] AWB(908,512,765)
    02-10 11:20:33.581089  4720 26740 D ae_mgr  : [doBackupAE()+] i4SensorDev:1
    02-10 11:20:33.581107  4720 26740 D ae_mgr  : [doBackupAE()-] i4SensorDev:1 m_rAESettingBackup.EvSetting:39998/5904/4100 (ISO:144) m_rAESettingBackup.u4Index/F:111/335 (IndexBase:3)Pre-flash:0 
    02-10 11:20:33.602423  4720 26740 D awb_mgr : [backup] AWB(908,512,765)
    02-10 11:20:33.605946  4720 26740 D Hal3ARaw: [doBackup2A]
    02-10 11:20:33.605960  4720 26740 D ae_mgr  : [doBackupAE()+] i4SensorDev:1
    02-10 11:20:33.605974  4720 26740 D ae_mgr  : [doBackupAE()-] i4SensorDev:1 m_rAESettingBackup.EvSetting:39998/5904/4100 (ISO:144) m_rAESettingBackup.u4Index/F:111/335 (IndexBase:3)Pre-flash:1 
    //预闪 flash on type:1：后摄 enable:1 开启闪光灯 scenario:3：预闪 duty(0).
    02-10 11:20:33.606962  4720 26847 I FlashHal: [CAT][flash] setOnOff(): type:1 enable:1 scenario:3
    02-10 11:20:33.606982  4720 26847 I FlashHal: setFlashOn(): duty(0), timeout(0), lt duty(0), lt timeout(0).
    02-10 11:20:33.607010  4720 26847 I StrobeDrvFlashlight: setDuty(): duty(0).
    02-10 11:20:33.607125  4720 26847 I StrobeDrvFlashlight: setOnOff(): enable(1).
    02-10 11:20:33.613575  4720 26847 I StrobeDrvFlashlight: setOnOff(): on time(148789707).
    02-10 11:20:33.632018  4720 26740 D awb_mgr : [backup] AWB(908,512,765)
    02-10 11:20:33.651878 26709 26746 I CamAp_FocusCaptureRequestConfigure: [onCaptureStarted] ae precapture triggered
    02-10 11:20:34.264236  4720 26740 D ae_mgr  : [doRestoreAE()] i4SensorDev:1 m_rAESettingBackup.EvSetting:39998/6016/4100 (ISO:147) m_rAESettingBackup.u4Index/F:111/335 (IndexBase: 3) bIsRestorePreflash:1
    02-10 11:20:34.265317  4720 26740 D ae_mgr  : [doRestoreAE] backup FD information at AFAE state (for main flash)
    //预闪 flash off
    02-10 11:20:34.288120  4720 26847 I FlashHal:  [CAT][flash] setOnOff(): type:1 enable:0 scenario:3
    02-10 11:20:34.288137  4720 26847 I FlashHal: setFlashOff().
    02-10 11:20:34.288156  4720 26847 I StrobeDrvFlashlight: setOnOff(): enable(0).
    02-10 11:20:34.289802  4720 26847 I StrobeDrvFlashlight: setOnOff(): off time(148790388).
    02-10 11:20:34.386669  4720 26740 I FlashMgrM: endPrecapture().
    02-10 11:20:34.386770  4720 26740 I FlashMgrM: endPrecapture().
    //开始拍照
    02-10 11:20:34.538837 26709 26746 I CamAp_PhotoMode: onShutterButtonClick, is storage ready : true,isDeviceReady = true
    02-10 11:20:34.540462 26709 26746 I CamAp_PhotoDevice2Controller: [takePicture] mSession= com.mediatek.camera.common.device.v2.Camera2CaptureSessionProxy@8fee002
    //拍照请求帧 control.captureIntent:2
    02-10 11:20:34.589042  4720 25786 I mtkcam-PipelineModelSession: [submitRequest] <4Cell/0> requestNo:88 { repeating:0 control.aeTargetFpsRange:10,30 control.captureIntent:2 control.enableZsl:1 control.processRawEn:0 control.mode:1 control.sceneMode:0 control.videoStabilizationMode:0 edge.mode:2 }
    02-10 11:20:34.589203  4720 25786 I mtkcam-FeatureSettingPolicy: [evaluateCaptureSetting] (0xb4000079e3e13630) capture req#:88
    02-10 11:20:34.589717  4720 25786 D mtkcam-FeatureSettingPolicy: [evaluateCaptureSetting] openId(0), sensorId(0), subsensorId(-1), sub sensor nums 0
    //拍照决策 MTK_CAMERA_SCENARIO_CAPTURE_NORMAL MTK_FEATURE_COMBINATION_SINGLE frames count
    02-10 11:20:34.589850  4720 25786 D mtkcam-FeatureSettingPolicy: [evaluateCaptureSetting] find scenario:MTK_CAMERA_SCENARIO_CAPTURE_NORMAL for (openId:0, scenario:1)
    02-10 11:20:34.605578  4720 25786 I mtkcam-FeatureSettingPolicy: [evaluateCaptureSetting] trigger feature:NO_FEATURE_NORMAL(0), feature combination:MTK_FEATURE_COMBINATION_SINGLE(0x20000000300f0) for req#88
    02-10 11:20:34.605586  4720 25786 D mtkcam-FeatureSettingPolicy: [evaluateCaptureSetting] capture request frames count(mainFrame:1, subFrames:0, preDummyFrames:2, postDummyFrames:3)
    //主闪开启 scenario:4 主闪 duty(1).
    02-10 11:20:34.738555  4720 26740 I FlashHal:  [CAT][flash] setOnOff(): type:1 enable:1 scenario:4
    02-10 11:20:34.738580  4720 26740 E FlashHal:  FLASH_HAL_SCENARIO_MAIN_FLASH dutyLt=-1,duty=1 (setOnOff){#610:vendor/mediatek/proprietary/hardware/mtkcam/aaa/source/isp_6s/../common/flash_mgr/flash_hal.cpp}
    02-10 11:20:34.738602  4720 26740 I FlashHal: setFlashOn(): duty(1), timeout(0), lt duty(-1), lt timeout(0).
    02-10 11:20:34.738627  4720 26740 I StrobeDrvFlashlight: setDuty(): duty(1).
    02-10 11:20:34.738738  4720 26740 I StrobeDrvFlashlight: setOnOff(): enable(1).
    02-10 11:20:34.743919  4720 26740 I StrobeDrvFlashlight: setOnOff(): on time(148790839).
    02-10 11:20:34.744568  4720 26740 D ae_mgr  : [doBackupAE()+] i4SensorDev:1
    02-10 11:20:34.744582  4720 26740 D ae_mgr  : [doBackupAE()-] i4SensorDev:1 m_rAESettingBackup.EvSetting:39998/5904/4100 (ISO:144) m_rAESettingBackup.u4Index/F:111/335 (IndexBase:3)Pre-flash:0 
    02-10 11:20:34.763537  4720 26740 D ae_mgr  : [doCapAE()] i4SensorDev:1 CamMode:5 TargetMode:0 minISO:25 bIsSyncAE:0
    02-10 11:20:34.763652  4720 26740 D ae_mgr  : [prepareAlgoFrameInfo] send backup FD information to algo at POSTCAP state (during main flash)
    02-10 11:20:34.764276  4720 26740 D ae_mgr  : [doCapAE():monitor] SensorDev:1 Mag:88 CWVY:450 AEStable:1 AlgoAPAELock/AlgoAFAELock:0/0 Index/F:111/335 Algo:39998/5904/4100(144) Real:20004/1632/4156(40) EV/BV/BVWOStrobe:68/18/18 SkipCount:0 hdr LE(39998/3643/4112/89) ME(39998/3643/4112/89) SE(39998/3643/4112/89) VSE(39998/3643/4112/89) R(100)
    02-10 11:20:34.836886  4720 26740 D ae_mgr  : [doRestoreAE()] i4SensorDev:1 m_rAESettingBackup.EvSetting:39998/6016/4100 (ISO:147) m_rAESettingBackup.u4Index/F:111/335 (IndexBase: 3) bIsRestorePreflash:0
    // 主闪关闭   enable:0  setFlashOff
    02-10 11:20:34.863356  4720 26763 I FlashHal:  [CAT][flash] setOnOff(): type:1 enable:0 scenario:4
    02-10 11:20:34.863367  4720 26763 E FlashHal:  FLASH_HAL_SCENARIO_MAIN_FLASH dutyLt=-1,duty=1 (setOnOff){#610:vendor/mediatek/proprietary/hardware/mtkcam/aaa/source/isp_6s/../common/flash_mgr/flash_hal.cpp}
    02-10 11:20:34.863374  4720 26763 I FlashHal: setFlashOff().
    02-10 11:20:34.863382  4720 26763 I StrobeDrvFlashlight: setOnOff(): enable(0).
    02-10 11:20:34.863939  4720 26763 I StrobeDrvFlashlight: setOnOff(): off time(148790964).
    // P2 capture  处理
    02-10 11:20:34.883859  4720 26765 I MtkCam/P2/CaptureNode: [queue] P2C cam 0: (0xb400007883da59b0) R/F Num: 88/90
    02-10 11:20:34.884348  4720 26792 D MtkCam/P2/CaptureProcessor: [onEnque] P2C cam 0: isZoom 0, isVsdof 0, isMultiCam 0, isHidlIsp 0
    02-10 11:20:34.885773  4720 26792 D MtkCam/P2/CaptureProcessor: [onEnque]P2 frame number(90) main sensorId(0) sub sensor(-1) isPhyStream(0) isPhyControl(0)
    02-10 11:20:34.885797  4720 26792 I MtkCam/P2/CaptureProcessor: [onEnque] P2C cam 0 MWFrame:#90 MWReq:#88, frame 90 : Index/Count:-1/0 Feature:0x20000000300f0
    02-10 11:20:34.885813  4720 26792 I MtkCam/P2/CaptureProcessor: [onEnque] P2C cam 0 MWFrame:#90 MWReq:#88, frame 90 : Index/Count:-1/0 isEarlyNotificationTrigger:1, isCshot:0, SS_CapHint:0
    02-10 11:20:34.885845  4720 26792 D MtkCam/P2/CaptureProcessor: [onEnque] P2C cam 0 MWFrame:#90 MWReq:#88, frame 90 : [SS] iShootingMode (0)
    02-10 11:20:34.885893  4720 26792 D MtkCam/P2/CaptureProcessor: [onEnque] P2C cam 0 MWFrame:#90 MWReq:#88, frame 90 : [SS] use out_jpeg size as validSize(2296,4080)
    02-10 11:20:34.885906  4720 26792 D MtkCam/P2/CaptureProcessor: [onEnque] P2C cam 0 MWFrame:#90 MWReq:#88, frame 90 : [SS] Update SEC_ANDROID_SCALER_VALID_IMAGE_REGION (0,0)(2296x4080)
    02-10 11:20:34.885917  4720 26792 I MtkCam/P2/CaptureProcessor: [onEnque] P2C cam 0 MWFrame:#90 MWReq:#88, frame 90 : enqued request to captureFeaturePipe, R/F Num:88/90
    02-10 11:20:34.895019  4720 26791 I MtkCam/P2/CaptureProcessor: [onContinue] P2C cam 0 MWFrame:#90 MWReq:#88, frame 90-0 : (0xb400007993dd3470) notify next capture, request count:1, R/F Num:88/90
    02-10 11:20:34.926198  4720 26896 I MtkCam/P2/CaptureProcessor: [notifyRelease] P2C cam 0: notify release, R/F Num:88/90
    02-10 11:20:34.926335  4720 26896 I MtkCam/P2/CaptureProcessor: [notifyRelease] P2C cam 0: notify release, R/F Num:88/90
    //保存图片
    02-10 11:20:35.025687  2150  2164 D MediaProvider: Open with FUSE. FilePath: /storage/emulated/0/DCIM/Camera/IMG_20250210_112034_998.jpg. Uid: 10100. Media Capabilities Uid: 0. ShouldRedact: false. ShouldTranscode: false

2.3 腾讯水印相机闪光灯拍照

腾讯水印相机 拍照流程几乎跟MTK camera 流程一致，走预闪，主闪流程。
scenario:3 预闪
scenario:4 主闪

2.3.1 水印相机下发预闪Tag，进行预闪，主闪
bd17afb0acc3176a6a56e38bf3db378c.jpeg
腾讯水印相机预闪，主闪
2.3.2 主闪存图处理
908277d0e7cc4a190c757c410e18f5b8.jpeg
腾讯水印相机主闪存图

2.4 美图秀秀，美颜相机、B612 闪光灯拍照

美图秀秀、美颜相机、B612等相机 拍照与视频录制统一一个button（点击拍照，长按录制视频），app 下发的flash on 场景为scenario:1 视频手电筒 scenario；

8182413c957e030884e498b0265c5e2c.jpeg
美图秀秀 拍照 视频统一

410dca5bb0054370ec756918fcb4760d.jpeg
美颜相机 点击拍照，长按录制视频

bf6088a09189afce9197d96688f802e5.jpeg
B612点击拍照，长按录制视频

参考文献：

【腾讯文档】Android Framework 知识库
https://docs.qq.com/doc/DSXBmSG9VbEROUXF5

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