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Camera API2 架构学习笔记

  • 2026-04-11 12:14:47
Camera API2 架构学习笔记

和你一起终身学习,这里是程序员Android

其实一眼就喜欢的不是文案,

而是似曾相识的经历 O(∩_∩)O

经典好文推荐,通过阅读本文,您将收获以下知识点:

一、简介
二、Camera API2 架构
2.1 Camera应用框架
2.2 Camera AIDL
2.3 Camera Native 框架
2.4 Camera binder IPC 接口
2.5 CameraService
2.6 Camera HAL
三、Camera API 2 操作流程
3.1 Camera参数获取操作
3.2 openCamera操作
3.3 CreateCaptureSession
3.4 request下发(起预览、拍照等操作)
3.5 Camera Hal回帧

一、简介

Camera API 2 (下面用Camera2简称)是最新的 Android 相机框架 API,它取代了已弃用的相机框架库(Camera API 1)。 Camera2 为复杂的用例提供深入的控制,但需要用户管理特定于设备的配置。用户可以在相应的参考文档中了解 Camera2 中的特定类和函数。总体上Camera遵循Client-Server架构,通过Binder通讯完成Camera APP -> Camera API2 -> CameraService -> Camera Hal流程。

二、Camera API2 架构

图2.1描述了Camera整体软件架构。

图2.1 Camera软件架构

Camera软件架构图从上到下可分为Camera应用框架、Camera AIDL、Camera Native 框架、Camera binder IPC 接口、Camera HAL六大部分。

2.1 Camera应用框架

Camera应用框架是Camera APP代码,它使用 Camera2 API 与Camera硬件进行交互,交互过程中会调用相应的 Binder 接口,以访问与Camera底层交互的原生代码。

Camera API2中CameraManager用于openCamera、CameraDevice用于创建CameraCaptureSession(配流)。

2.2 Camera AIDL

Camera AIDL接口是Camera API2与CameraService的连接桥梁,与 CameraService关联的 binder 接口可在frameworks/av/camera/aidl/android/hardware中找到。生成的代码会调用Camera hal的原生代码以获取对实体Camera的访问权限,并返回用于在框架级别创建 CameraDevice并最终创建 CameraCaptureSession对象的数据。

2.3 Camera Native 框架

此框架位于 frameworks/av/中,并提供相当于 CameraDevice和 CameraCaptureSession类的原生类,另请参阅 NDK camera2 参考。Camera Native框架包含了CameraService、Camera metadata等

2.4 Camera binder IPC 接口

IPC binder 接口用于实现跨越进程边界的通信。调用相机服务的若干个相机 binder 类位于 /frameworks/av/camera/aidl/android/hardware/目录中。

  • ICameraService 是相机服务的接口;
  • ICameraDeviceUser 是已打开的特定相机设备的接口;
  • ICameraServiceListener 和 ICameraDeviceCallbacks 分别是对应用框架的 CameraService 和 CameraDevice 回调接口。

2.5 CameraService

路径: frameworks/av/services/camera/libcameraservice/CameraService.cpp ,相机服务是与 HAL 进行互动的实际代码。

2.6 Camera HAL

硬件抽象层定义了由相机服务调用、且您必须实现以确保相机硬件正常运行的标准接口。

三、Camera API 2 操作流程

图 3.1 Camera API 2 操作流程

Camera API2的核心操作流程如图3.1。从左到右分为三个模块,分别是Camera APP、Camera2 API、Camera Device HardWare(由Camera hal控制)。

下面简要介绍Camera API2操作流程:

3.1 Camera参数获取操作

当app调用 Context.getSystemService()获得CameraManager后。其一,需要通过CameraManager对象注册Camera可用的回调(AvailabilityCallback),用于判断Camera是否可用,可用的状态下才执行CameraManager.openCamera操作;其二,需要通过getCameraIdList获取可用的Camera逻辑id;其三,通过getCameraCharacteristics获取Camera Characteristic信息,如Camera尺寸,3A参数等描述CameraDevice的信息。

3.2 openCamera操作

CameraManager.openCamera用于打开相机,openCamera成功会返回CameraDevice,失败会返回错误码。详见/frameworks/base/core/java/android/hardware/camera2/CameraDevice.java,app侧可通过重写的 CameraDevice.StateCallback 的 onOpened、onDisconnected、onError 方法得知当前 CameraDevice 的状态。

openCamera简要流程:CameraManager.openCamera - > CameraService.connectDevice -> CameraManagerProvider.openSession -> Camera hal openCamera。

3.3 CreateCaptureSession

CameraDevice.CreateCaptureSession就是配流的操作,一般配置预览、拍照、录像流,对应的surface有surfaceview或者surfaceTexture、imageReader创建的surface、MediaRecorder;配流会配置设置默认的CaptureRequest模板参数,如预览的CameraDevice.TEMPLATE_PREVIEW,录像的CameraDevice.TEMPLATE_RECORD,拍照的CameraDevice.TEMPLATE_STILL_CAPTURE。配流可以理解为配置流的输出容器,以Camera hal为buffer的生产者,那么就是配置outConfigurations。

  • CreateCaptureSession简要流程:CameraDevice.CreateCaptureSession -> CameraDeviceImpl.createStreams -> CameraDeviceClient.mHidlSession.configureStreams -> Camera hal configureStreams。

3.4 request下发(起预览、拍照等操作)

request下发是是processCaptureRequest流程。配流完成后,通过CameraCaptureSession.StateCallback可以获取CameraCaptureSession对象用于后续的起预览(setRepeatingRequest)、拍照或者对焦(capture)、停预览(stopRepeating)、关相机操作(abortCaptures)等操作,这些操作都是通过下发request或者移除request实现,其中,预览request连续的,拍照的request是单一的,预览和拍照的request都会放到队列中,然后下发到camera hal。app只需通过setRepeatingRequest下发预览的request,而预览request的循环下发在/frameworks/av/services/camera/libcameraservice/device3/Camera3Device.cpp的RequestThread:threadloop中完成,预览轮转buffer个数是4。

值得注意的是:拍照的优先级高于预览的优先级,如果预览的过程中收到拍照的请求,会以插队的形式将拍照的请求查到队列中。

3.5 Camera Hal回帧

Camera Hal回帧是processCaptureResult流程。processCaptureResult流程是camera hal buffer和参数回调的过程。大致流程是:其一,Camera hal将预览帧或者拍照帧的buffer填充到app配流的surface中,如果时预览帧,surface通过queen buffer形式消费buff;如果是拍照帧,拍照的buffer返回给app,app做图片保存。其二是。Camera hal将处理的预览帧和拍照帧的参数信息通过metadata返回给app。

Camera API2关键操作流程见图 3.2 。

图 3.2 Camera API2关键操作流程

四、参考

原文链接:https://blog.csdn.net/qq_37695230/article/details/131803939

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  1. CONNECT:[ UseTime:0.000693s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001587s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000608s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000561s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001153s ]
  6. SELECT * FROM `set` [ RunTime:0.000427s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001095s ]
  8. SELECT * FROM `article` WHERE `id` = 480097 LIMIT 1 [ RunTime:0.000914s ]
  9. UPDATE `article` SET `lasttime` = 1775889041 WHERE `id` = 480097 [ RunTime:0.008461s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000524s ]
  11. SELECT * FROM `article` WHERE `id` < 480097 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000860s ]
  12. SELECT * FROM `article` WHERE `id` > 480097 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000785s ]
  13. SELECT * FROM `article` WHERE `id` < 480097 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001612s ]
  14. SELECT * FROM `article` WHERE `id` < 480097 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002265s ]
  15. SELECT * FROM `article` WHERE `id` < 480097 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001533s ]
0.160361s