深入剖析Android Camera源码：解锁手
随着智能手机的普及，手机摄像头已经成为我们日常生活中不可或缺的一部分。从简单的拍照到复杂的视频拍摄，Android系统为我们提供了丰富的API来访问和控制手机摄像头。本文将深入剖析Android Camera源码，带您解锁手机摄像头功能的奥秘。
一、Android Camera简介
Android Camera是Android系统提供的一个API，用于访问和控制手机摄像头。它提供了一个统一的接口，让开发者可以方便地访问摄像头硬件，实现拍照、录像等功能。Camera API包括以下几个核心组件：
1.Camera硬件抽象层（HAL）：负责与底层硬件交互，提供统一的接口供上层调用。 2.Camera服务：管理Camera设备，负责设备的打开、关闭、状态查询等操作。 3.Camera客户端：开发者编写的应用程序，通过Camera API调用摄像头功能。
二、Android Camera源码结构
Android Camera源码主要分为以下几个部分：
1.Camera HAL：负责与硬件交互，包括Camera模块的初始化、预览、拍照、录像等功能。 2.Camera服务：负责管理Camera设备，包括设备打开、关闭、状态查询等操作。 3.Camera客户端：开发者编写的应用程序，通过Camera API调用摄像头功能。
三、Camera HAL源码解析
1.Camera模块初始化
Camera模块初始化是Camera HAL的第一步，主要完成以下工作：
（1）加载Camera模块的驱动程序，获取设备节点； （2）获取Camera模块的参数，如分辨率、对焦模式等； （3）创建Camera模块的句柄，用于后续操作。
以下是Camera模块初始化的关键代码：
`java
int cameramoduleopen(const char *cameraid, struct cameramodule **module) {
int err = 0;
char devnode[256];
snprintf(devnode, sizeof(devnode), "/dev/%s", cameraid);
module->id = cameraid;
module->halversion = CAMERASENSORVERSION32;
module->open = cameramoduleopen;
module->close = cameramoduleclose;
module->init = cameramoduleinit;
module->deinit = cameramoduledeinit;
module->control = cameramodulecontrol;
module->configure = cameramoduleconfigure;
module->preview = cameramodulepreview;
module->capture = cameramodulecapture;
module->flush = cameramoduleflush;
module->setparameters = cameramodulesetparameters;
module->getparameters = cameramodulegetparameters;
module->dump = cameramoduledump;
module->streamon = cameramodulestreamon;
module->streamoff = cameramodulestreamoff;
module->getinfo = cameramodulegetinfo;
module->setcallback = cameramodulesetcallback;
module->enableflash = cameramoduleenableflash;
module->focus = cameramodulefocus;
module->focuscallback = cameramodulefocuscallback;
module->lock = cameramodulelock;
module->unlock = cameramoduleunlock;
module->registereventcallback = cameramoduleregistereventcallback;
module->unregistereventcallback = cameramoduleunregistereventcallback;
module->setpowermode = cameramodulesetpowermode;
module->settorchmode = cameramodulesettorchmode;
module->setpreviewwindow = cameramodulesetpreviewwindow;
module->getpreviewwindow = cameramodulegetpreviewwindow;
module->getstreamparams = cameramodulegetstreamparams;
module->getframestats = cameramodulegetframestats;
module->getcamerainfo = cameramodulegetcamerainfo;
module->getfacedetectinfo = cameramodulegetfacedetectinfo;
module->getflashinfo = cameramodulegetflashinfo;
module->getpreviewsize = cameramodulegetpreviewsize;
module->getcapturesize = cameramodulegetcapturesize;
module->getvideosize = cameramodulegetvideosize;
module->getrawsizes = cameramodulegetrawsizes;
module->getjpegsizes = cameramodulegetjpegsizes;
module->getvideostreamconfig = cameramodulegetvideostreamconfig;
module->getrawstreamconfig = cameramodulegetrawstreamconfig;
module->getframeraterange = cameramodulegetframeraterange;
module->getframedurationrange = cameramodulegetframedurationrange;
module->getframetimelapserange = cameramodulegetframetimelapserange;
module->getfacedetectstreamconfig = cameramodulegetfacedetectstreamconfig;
module->getfacedetectsizes = cameramodulegetfacedetectsizes;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = cameramodulegetfacedetectframeraterange;
module->getfacedetectframedurationrange = cameramodulegetfacedetectframedurationrange;
module->getfacedetectframetimelapserange = cameramodulegetfacedetectframetimelapserange;
module->getfacedetectframestats = cameramodulegetfacedetectframestats;
module->getfacedetectframeraterange = camera