Android Camera进程间通信类总结-程序员宅基地

技术标签： java  ui  移动开发  

《Android Camera架构》
《Android Camera进程间通信类总结》
《Android Camera模块解析之拍照》
《Android Camera模块解析之视频录制》
《Android Camera原理之CameraDeviceCallbacks回调模块》
《Android Camera原理之openCamera模块(一)》
《Android Camera原理之openCamera模块(二)》
《Android Camera原理之createCaptureSession模块》
《Android Camera原理之setRepeatingRequest与capture模块》
《Android Camera原理之编译》
《Android Camera原理之camera provider启动》
《Android Camera原理之cameraserver与cameraprovider是怎样联系的》
《Android Camera原理之camera service与camera provider session会话与capture request轮转》
《Android Camera原理之camera HAL底层数据结构与类总结》
《Android Camera原理之camera service类与接口关系》

我们直达camera模块的代码根据层次可以分为下面几层，开发者直接接触的是Camera api的部分，Camera api会通过Binder IPC方式调用到Camera服务部分，但是这部分代码实在繁杂，需要将这部分IPC联系的方式总结一些，方便后来人方便的学习这一块的内容。

  • Camera api部分：
    frameworks/base/core/java/android/hardware/camera2
  • Camera JNI部分：
    frameworks/base/core/jni/android_hardware_Camera.cpp
    编译选项在目录下的Android.bp
    make libandroid_runtime -j1
  • Camera UI库部分：
    frameworks/av/camera/
    编译选项在目录下的Android.bp
    make libcamera_client -j1
  • Camera服务部分：
    frameworks/av/services/camera/libcameraservice/
    编译选项在目录下的Android.mk
    make libcameraservice -j1
  • Camera HAL部分：
    hardware/qcom/camera/

首先大家关注一下这个代码路径：frameworks/av/camera/aidl/ 这里是和cameraservice端交互的桥梁。


cameraservice端的代码在frameworks/av/services/camera/libcameraservice/下面。

1.ICameraDeviceUser.aidl

这个aidl文件会自动生成：
./out/soong/.intermediates/frameworks/av/camera/libcamera_client/android_arm_armv7-a-neon_core_shared_platform/gen/aidl/android/hardware/camera2/ICameraDeviceUser.h

#ifndef AIDL_GENERATED_ANDROID_HARDWARE_CAMERA2_I_CAMERA_DEVICE_USER_H_
#define AIDL_GENERATED_ANDROID_HARDWARE_CAMERA2_I_CAMERA_DEVICE_USER_H_

#include <binder/IBinder.h>
#include <binder/IInterface.h>
#include <binder/Status.h>
#include <camera/CameraMetadata.h>
#include <camera/camera2/CaptureRequest.h>
#include <camera/camera2/OutputConfiguration.h>
#include <camera/camera2/SubmitInfo.h>
#include <cstdint>
#include <gui/view/Surface.h>
#include <utils/StrongPointer.h>
#include <vector>

namespace android {

namespace hardware {

namespace camera2 {

class ICameraDeviceUser : public ::android::IInterface {
public:
  DECLARE_META_INTERFACE(CameraDeviceUser)
  enum  : int32_t {
    NO_IN_FLIGHT_REPEATING_FRAMES = -1,
    NORMAL_MODE = 0,
    CONSTRAINED_HIGH_SPEED_MODE = 1,
    VENDOR_MODE_START = 32768,
    TEMPLATE_PREVIEW = 1,
    TEMPLATE_STILL_CAPTURE = 2,
    TEMPLATE_RECORD = 3,
    TEMPLATE_VIDEO_SNAPSHOT = 4,
    TEMPLATE_ZERO_SHUTTER_LAG = 5,
    TEMPLATE_MANUAL = 6,
  };
  virtual ::android::binder::Status disconnect() = 0;
  virtual ::android::binder::Status submitRequest(const ::android::hardware::camera2::CaptureRequest& request, bool streaming, ::android::hardware::camera2::utils::SubmitInfo* _aidl_return) = 0;
  virtual ::android::binder::Status submitRequestList(const ::std::vector<::android::hardware::camera2::CaptureRequest>& requestList, bool streaming, ::android::hardware::camera2::utils::SubmitInfo* _aidl_return) = 0;
  virtual ::android::binder::Status cancelRequest(int32_t requestId, int64_t* _aidl_return) = 0;
  virtual ::android::binder::Status beginConfigure() = 0;
  virtual ::android::binder::Status endConfigure(int32_t operatingMode, const ::android::hardware::camera2::impl::CameraMetadataNative& sessionParams) = 0;
  virtual ::android::binder::Status deleteStream(int32_t streamId) = 0;
  virtual ::android::binder::Status createStream(const ::android::hardware::camera2::params::OutputConfiguration& outputConfiguration, int32_t* _aidl_return) = 0;
  virtual ::android::binder::Status createInputStream(int32_t width, int32_t height, int32_t format, int32_t* _aidl_return) = 0;
  virtual ::android::binder::Status getInputSurface(::android::view::Surface* _aidl_return) = 0;
  virtual ::android::binder::Status createDefaultRequest(int32_t templateId, ::android::hardware::camera2::impl::CameraMetadataNative* _aidl_return) = 0;
  virtual ::android::binder::Status getCameraInfo(::android::hardware::camera2::impl::CameraMetadataNative* _aidl_return) = 0;
  virtual ::android::binder::Status waitUntilIdle() = 0;
  virtual ::android::binder::Status flush(int64_t* _aidl_return) = 0;
  virtual ::android::binder::Status prepare(int32_t streamId) = 0;
  virtual ::android::binder::Status tearDown(int32_t streamId) = 0;
  virtual ::android::binder::Status prepare2(int32_t maxCount, int32_t streamId) = 0;
  virtual ::android::binder::Status updateOutputConfiguration(int32_t streamId, const ::android::hardware::camera2::params::OutputConfiguration& outputConfiguration) = 0;
  virtual ::android::binder::Status finalizeOutputConfigurations(int32_t streamId, const ::android::hardware::camera2::params::OutputConfiguration& outputConfiguration) = 0;
  enum Call {
    DISCONNECT = ::android::IBinder::FIRST_CALL_TRANSACTION + 0,
    SUBMITREQUEST = ::android::IBinder::FIRST_CALL_TRANSACTION + 1,
    SUBMITREQUESTLIST = ::android::IBinder::FIRST_CALL_TRANSACTION + 2,
    CANCELREQUEST = ::android::IBinder::FIRST_CALL_TRANSACTION + 3,
    BEGINCONFIGURE = ::android::IBinder::FIRST_CALL_TRANSACTION + 4,
    ENDCONFIGURE = ::android::IBinder::FIRST_CALL_TRANSACTION + 5,
    DELETESTREAM = ::android::IBinder::FIRST_CALL_TRANSACTION + 6,
    CREATESTREAM = ::android::IBinder::FIRST_CALL_TRANSACTION + 7,
    CREATEINPUTSTREAM = ::android::IBinder::FIRST_CALL_TRANSACTION + 8,
    GETINPUTSURFACE = ::android::IBinder::FIRST_CALL_TRANSACTION + 9,
    CREATEDEFAULTREQUEST = ::android::IBinder::FIRST_CALL_TRANSACTION + 10,
    GETCAMERAINFO = ::android::IBinder::FIRST_CALL_TRANSACTION + 11,
    WAITUNTILIDLE = ::android::IBinder::FIRST_CALL_TRANSACTION + 12,
    FLUSH = ::android::IBinder::FIRST_CALL_TRANSACTION + 13,
    PREPARE = ::android::IBinder::FIRST_CALL_TRANSACTION + 14,
    TEARDOWN = ::android::IBinder::FIRST_CALL_TRANSACTION + 15,
    PREPARE2 = ::android::IBinder::FIRST_CALL_TRANSACTION + 16,
    UPDATEOUTPUTCONFIGURATION = ::android::IBinder::FIRST_CALL_TRANSACTION + 17,
    FINALIZEOUTPUTCONFIGURATIONS = ::android::IBinder::FIRST_CALL_TRANSACTION + 18,
  };
};  // class ICameraDeviceUser

class ICameraDeviceUserDefault : public ICameraDeviceUser {
public:
  ::android::IBinder* onAsBinder() override;
  ::android::binder::Status disconnect() override;
  ::android::binder::Status submitRequest(const ::android::hardware::camera2::CaptureRequest& request, bool streaming, ::android::hardware::camera2::utils::SubmitInfo* _aidl_return) override;
  ::android::binder::Status submitRequestList(const ::std::vector<::android::hardware::camera2::CaptureRequest>& requestList, bool streaming, ::android::hardware::camera2::utils::SubmitInfo* _aidl_return) override;
  ::android::binder::Status cancelRequest(int32_t requestId, int64_t* _aidl_return) override;
  ::android::binder::Status beginConfigure() override;
  ::android::binder::Status endConfigure(int32_t operatingMode, const ::android::hardware::camera2::impl::CameraMetadataNative& sessionParams) override;
  ::android::binder::Status deleteStream(int32_t streamId) override;
  ::android::binder::Status createStream(const ::android::hardware::camera2::params::OutputConfiguration& outputConfiguration, int32_t* _aidl_return) override;
  ::android::binder::Status createInputStream(int32_t width, int32_t height, int32_t format, int32_t* _aidl_return) override;
  ::android::binder::Status getInputSurface(::android::view::Surface* _aidl_return) override;
  ::android::binder::Status createDefaultRequest(int32_t templateId, ::android::hardware::camera2::impl::CameraMetadataNative* _aidl_return) override;
  ::android::binder::Status getCameraInfo(::android::hardware::camera2::impl::CameraMetadataNative* _aidl_return) override;
  ::android::binder::Status waitUntilIdle() override;
  ::android::binder::Status flush(int64_t* _aidl_return) override;
  ::android::binder::Status prepare(int32_t streamId) override;
  ::android::binder::Status tearDown(int32_t streamId) override;
  ::android::binder::Status prepare2(int32_t maxCount, int32_t streamId) override;
  ::android::binder::Status updateOutputConfiguration(int32_t streamId, const ::android::hardware::camera2::params::OutputConfiguration& outputConfiguration) override;
  ::android::binder::Status finalizeOutputConfigurations(int32_t streamId, const ::android::hardware::camera2::params::OutputConfiguration& outputConfiguration) override;

};

}  // namespace camera2

}  // namespace hardware

}  // namespace android

#endif  // AIDL_GENERATED_ANDROID_HARDWARE_CAMERA2_I_CAMERA_DEVICE_USER_H_

./out/soong/.intermediates/frameworks/av/camera/libcamera_client/android_arm_armv7-a-neon_core_shared_platform/gen/aidl/android/hardware/camera2/BnCameraDeviceUser.h继承了ICameraDeviceUser.h

#ifndef AIDL_GENERATED_ANDROID_HARDWARE_CAMERA2_BN_CAMERA_DEVICE_USER_H_
#define AIDL_GENERATED_ANDROID_HARDWARE_CAMERA2_BN_CAMERA_DEVICE_USER_H_

#include <binder/IInterface.h>
#include <android/hardware/camera2/ICameraDeviceUser.h>

namespace android {

namespace hardware {

namespace camera2 {

class BnCameraDeviceUser : public ::android::BnInterface<ICameraDeviceUser> {
public:
  ::android::status_t onTransact(uint32_t _aidl_code, const ::android::Parcel& _aidl_data, ::android::Parcel* _aidl_reply, uint32_t _aidl_flags = 0) override;
};  // class BnCameraDeviceUser

}  // namespace camera2

}  // namespace hardware

}  // namespace android

#endif  // AIDL_GENERATED_ANDROID_HARDWARE_CAMERA2_BN_CAMERA_DEVICE_USER_H_

./frameworks/av/services/camera/libcameraservice/api2/CameraDeviceClient.h中又发现了继承BnCameraDeviceUser.h的代码。

struct CameraDeviceClientBase :
         public CameraService::BasicClient,
         public hardware::camera2::BnCameraDeviceUser
{
    typedef hardware::camera2::ICameraDeviceCallbacks TCamCallbacks;

    const sp<hardware::camera2::ICameraDeviceCallbacks>& getRemoteCallback() {
        return mRemoteCallback;
    }

protected:
    CameraDeviceClientBase(const sp<CameraService>& cameraService,
            const sp<hardware::camera2::ICameraDeviceCallbacks>& remoteCallback,
            const String16& clientPackageName,
            const String8& cameraId,
            int api1CameraId,
            int cameraFacing,
            int clientPid,
            uid_t clientUid,
            int servicePid);

    sp<hardware::camera2::ICameraDeviceCallbacks> mRemoteCallback;
};

class CameraDeviceClient :
        public Camera2ClientBase<CameraDeviceClientBase>,
        public camera2::FrameProcessorBase::FilteredListener
{
//......
}

这个IPC调用时为了操作底层的Camera Device，获取camera device重要信息，并操作Camera Device，提供了int createStream(in OutputConfiguration outputConfiguration);来创建captute session机制，Surface getInputSurface();来返回相应的输入流。

2.ICameraDeviceCallbacks.aidl

./out/soong/.intermediates/frameworks/av/camera/libcamera_client/android_arm_armv7-a-neon_core_shared_platform/gen/aidl/android/hardware/camera2/ICameraDeviceCallbacks.h
| |
| |
./out/soong/.intermediates/frameworks/av/camera/libcamera_client/android_arm_armv7-a-neon_core_shared_platform/gen/aidl/android/hardware/camera2/BnCameraDeviceCallbacks.h
| |
| |
frameworks/av/camera/ndk/impl/ACameraDevice.h

    // Callbacks from camera service
    class ServiceCallback : public hardware::camera2::BnCameraDeviceCallbacks {
      public:
        explicit ServiceCallback(CameraDevice* device) : mDevice(device) {}
        binder::Status onDeviceError(int32_t errorCode,
                           const CaptureResultExtras& resultExtras) override;
        binder::Status onDeviceIdle() override;
        binder::Status onCaptureStarted(const CaptureResultExtras& resultExtras,
                              int64_t timestamp) override;
        binder::Status onResultReceived(const CameraMetadata& metadata,
                              const CaptureResultExtras& resultExtras,
                              const std::vector<PhysicalCaptureResultInfo>& physicalResultInfos) override;
        binder::Status onPrepared(int streamId) override;
        binder::Status onRequestQueueEmpty() override;
        binder::Status onRepeatingRequestError(int64_t lastFrameNumber,
                int32_t stoppedSequenceId) override;
      private:
        const wp<CameraDevice> mDevice;
    };

这是获取当前Camera Device状态的回调，在操作camera device之前需要判断当前的camera是否可用。

3.ICameraService.aidl

./out/soong/.intermediates/frameworks/av/camera/libcamera_client/android_arm_armv7-a-neon_core_shared_platform/gen/aidl/android/hardware/ICameraService.h
| |
| |
./out/soong/.intermediates/frameworks/av/camera/libcamera_client/android_arm_armv7-a-neon_core_shared_platform/gen/aidl/android/hardware/BnCameraService.h
| |
| |
frameworks/av/services/camera/libcameraservice/CameraService.h

class CameraService :
    public BinderService<CameraService>,
    public virtual ::android::hardware::BnCameraService,
    public virtual IBinder::DeathRecipient,
    public virtual CameraProviderManager::StatusListener
{
//......
}

这个Camera Service的主类，用户进程中操作camera核心功能：connectDevice、设置闪光灯等等操作都是通过IPC调用camera service实现的。

4.ICameraServiceProxy.aidl

./out/soong/.intermediates/frameworks/av/camera/libcamera_client/android_arm_armv7-a-neon_core_shared_platform/gen/aidl/android/hardware/ICameraServiceProxy.h
| |
| |
./out/soong/.intermediates/frameworks/av/camera/libcamera_client/android_arm_armv7-a-neon_core_shared_platform/gen/aidl/android/hardware/BnCameraServiceProxy.h
| |
| |
frameworks/base/services/core/java/com/android/server/camera/CameraServiceProxy.java

    private final ICameraServiceProxy.Stub mCameraServiceProxy = new ICameraServiceProxy.Stub() {
        @Override
        public void pingForUserUpdate() {
            if (Binder.getCallingUid() != Process.CAMERASERVER_UID) {
                Slog.e(TAG, "Calling UID: " + Binder.getCallingUid() + " doesn't match expected " +
                        " camera service UID!");
                return;
            }
            notifySwitchWithRetries(30);
        }

        @Override
        public void notifyCameraState(String cameraId, int newCameraState, int facing,
                String clientName, int apiLevel) {
            if (Binder.getCallingUid() != Process.CAMERASERVER_UID) {
                Slog.e(TAG, "Calling UID: " + Binder.getCallingUid() + " doesn't match expected " +
                        " camera service UID!");
                return;
            }
            String state = cameraStateToString(newCameraState);
            String facingStr = cameraFacingToString(facing);
            if (DEBUG) Slog.v(TAG, "Camera " + cameraId + " facing " + facingStr + " state now " +
                    state + " for client " + clientName + " API Level " + apiLevel);

            updateActivityCount(cameraId, newCameraState, facing, clientName, apiLevel);
        }
    };
5.ICameraServiceListener.aidl

./out/soong/.intermediates/frameworks/av/camera/libcamera_client/android_arm_armv7-a-neon_core_shared_platform/gen/aidl/android/hardware/ICameraServiceListener.h
| |
| |
./out/soong/.intermediates/frameworks/av/camera/libcamera_client/android_arm_armv7-a-neon_core_shared_platform/gen/aidl/android/hardware/BnCameraServiceListener.h
| |
| |
frameworks/base/core/java/android/hardware/camera2/CameraManager.java

    private static final class CameraManagerGlobal extends ICameraServiceListener.Stub
            implements IBinder.DeathRecipient {
    }
6.其他aidl文件

其他的aidl文件都是IPC间传输的Parcelable类型的数据，例如CaptureRequest.aidl就是IPC中相机捕获请求的数据，CameraInfo.aidl就是IPC中 camera数据的集合。

 

转载于:https://my.oschina.net/u/920274/blog/3076987
版权声明：本文为博主原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。
本文链接：https://blog.csdn.net/chuotao1354/article/details/100768015

智能推荐

c# 调用c++ lib静态库_c#调用lib-程序员宅基地

文章浏览阅读2w次，点赞7次，收藏51次。四个步骤1.创建C++ Win32项目动态库dll 2.在Win32项目动态库中添加 外部依赖项 lib头文件和lib库3.导出C接口4.c#调用c++动态库开始你的表演...①创建一个空白的解决方案，在解决方案中添加 Visual C++ , Win32 项目空白解决方案的创建：添加Visual C++ , Win32 项目这......_c#调用lib

deepin/ubuntu安装苹方字体-程序员宅基地

文章浏览阅读4.6k次。苹方字体是苹果系统上的黑体，挺好看的。注重颜值的网站都会使用，例如知乎：font-family: -apple-system, BlinkMacSystemFont, Helvetica Neue, PingFang SC, Microsoft YaHei, Source Han Sans SC, Noto Sans CJK SC, W..._ubuntu pingfang

html表单常见操作汇总_html表单的处理程序有那些-程序员宅基地

文章浏览阅读159次。表单表单概述表单标签表单域按钮控件demo表单标签表单标签基本语法结构<form action="处理数据程序的url地址“ method=”get|post“ name="表单名称”></form><!--action,当提交表单时，向何处发送表单中的数据，地址可以是相对地址也可以是绝对地址--><!--method将表单中的数据传送给服务器处理，get方式直接显示在url地址中，数据可以被缓存，且长度有限制；而post方式数据隐藏传输，_html表单的处理程序有那些

PHP设置谷歌验证器（Google Authenticator）实现操作二步验证_php otp 验证器-程序员宅基地

文章浏览阅读1.2k次。使用说明:开启Google的登陆二步验证（即Google Authenticator服务）后用户登陆时需要输入额外由手机客户端生成的一次性密码。实现Google Authenticator功能需要服务器端和客户端的支持。服务器端负责密钥的生成、验证一次性密码是否正确。客户端记录密钥后生成一次性密码。下载谷歌验证类库文件放到项目合适位置(我这边放在项目Vender下面)https://github.com/PHPGangsta/GoogleAuthenticatorPHP代码示例://引入谷_php otp 验证器

【Python】matplotlib.plot画图横坐标混乱及间隔处理_matplotlib更改横轴间距-程序员宅基地

文章浏览阅读4.3k次，点赞5次，收藏11次。matplotlib.plot画图横坐标混乱及间隔处理_matplotlib更改横轴间距

docker — 容器存储_docker 保存容器-程序员宅基地

文章浏览阅读2.2k次。①Storage driver 处理各镜像层及容器层的处理细节，实现了多层数据的堆叠，为用户 提供了多层数据合并后的统一视图②所有 Storage driver 都使用可堆叠图像层和写时复制（CoW）策略③docker info 命令可查看当系统上的 storage driver主要用于测试目的，不建议用于生成环境。_docker 保存容器

随便推点

网络拓扑结构_网络拓扑csdn-程序员宅基地

文章浏览阅读834次，点赞27次，收藏13次。网络拓扑结构是指计算机网络中各组件（如计算机、服务器、打印机、路由器、交换机等设备）及其连接线路在物理布局或逻辑构型上的排列形式。这种布局不仅描述了设备间的实际物理连接方式，也决定了数据在网络中流动的路径和方式。不同的网络拓扑结构影响着网络的性能、可靠性、可扩展性及管理维护的难易程度。_网络拓扑csdn

JS重写Date函数，兼容IOS系统_date.prototype 将所有 ios-程序员宅基地

文章浏览阅读1.8k次，点赞5次，收藏8次。IOS系统Date的坑要创建一个指定时间的new Date对象时，通常的做法是：new Date("2020-09-21 11:11:00")这行代码在 PC 端和安卓端都是正常的，而在 iOS 端则会提示 Invalid Date 无效日期。在IOS年月日中间的横岗许换成斜杠，也就是new Date("2020/09/21 11:11:00")通常为了兼容IOS的这个坑，需要做一些额外的特殊处理，笔者在开发的时候经常会忘了兼容IOS系统。所以就想试着重写Date函数，一劳永逸，避免每次ne_date.prototype 将所有 ios

如何将EXCEL表导入plsql数据库中-程序员宅基地

文章浏览阅读5.3k次。方法一：用PLSQL Developer工具。 1 在PLSQL Developer的sql window里输入select * from test for update; 2 按F8执行 3 打开锁, 再按一下加号. 鼠标点到第一列的列头，使全列成选中状态，然后粘贴，最后commit提交即可。（前提..._excel导入pl/sql

Git常用命令速查手册-程序员宅基地

文章浏览阅读83次。Git常用命令速查手册1、初始化仓库git init2、将文件添加到仓库git add 文件名 # 将工作区的某个文件添加到暂存区 git add -u # 添加所有被tracked文件中被修改或删除的文件信息到暂存区，不处理untracked的文件git add -A # 添加所有被tracked文件中被修改或删除的文件信息到暂存区，包括untracked的文件...

分享119个ASP.NET源码总有一个是你想要的_千博二手车源码v2023 build 1120-程序员宅基地

文章浏览阅读202次。分享119个ASP.NET源码总有一个是你想要的_千博二手车源码v2023 build 1120

【C++缺省函数】 空类默认产生的6个类成员函数_空类默认产生哪些类成员函数-程序员宅基地

文章浏览阅读1.8k次。版权声明：转载请注明出处 http://blog.csdn.net/irean_lau。目录(?)[+]1、缺省构造函数。2、缺省拷贝构造函数。3、 缺省析构函数。4、缺省赋值运算符。5、缺省取址运算符。6、 缺省取址运算符 const。[cpp] view plain copy_空类默认产生哪些类成员函数

推荐文章

热门文章

相关标签