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
Flash HAL 场景枚举值
1.2 AE AF mode State 枚举值
AE AF mode State 枚举值
1.3 AWB mode State 枚举值
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
预闪备份2A
2.2.2 闪光灯第二次打闪：主闪
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: false2.3 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
腾讯水印相机预闪，主闪
2.3.2 主闪存图处理
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；
美图秀秀 拍照 视频统一
美颜相机 点击拍照，长按录制视频
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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