相机闪光灯拍照流程分析

程序员Android2025-02-15 11:54

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。

go 复制代码 
// 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


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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