Android Things相机流媒体（带opencv）

问题描述 投票：0回答：3

对于android事物的相机权限有问题，当我尝试运行简单的OpenCV应用程序时，此消息显示“似乎您的设备不支持相机（或它被锁定），应用程序将被关闭.Logcat - 在Android中过滤Studio向我显示OpenCV库已正确加载，所以我想问题可能是权限（你可以检查我的AndroidManifest文件）或者可能与OpenCV库的兼容性差...

此外，Logcat报告此错误：“E / JavaCameraView：Camera＃0无法打开：无法连接到摄像头服务”

链接到源代码：https://github.com/mrAlex-dev/CameraPreview-AndroidThings

附：我正在使用：Raspberry Pi 3 B，Raspberry Pi Camera v1.3，Android Things - 0.4.1-devpreview，OpenCV-3.3.0-android-sdk ...

请有人帮助我，我是新手。

MainActivity.java的代码：

package com.example.alexd.camerapreviewandroidthings;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.SurfaceView;

import org.opencv.android.BaseLoaderCallback;
import org.opencv.android.CameraBridgeViewBase;
import org.opencv.android.JavaCameraView;
import org.opencv.android.LoaderCallbackInterface;
import org.opencv.android.OpenCVLoader;
import org.opencv.core.CvType;
import org.opencv.core.Mat;

public class MainActivity extends Activity implements CameraBridgeViewBase.CvCameraViewListener2 {

    private static String TAG = "MainActivity";
    JavaCameraView javaCameraView;
    Mat mRgba;

    BaseLoaderCallback mLoaderCallBack = new BaseLoaderCallback(this) {
        @Override
        public void onManagerConnected(int status) {
            switch(status){
                case BaseLoaderCallback.SUCCESS:{
                    javaCameraView.enableView();
                    break;
                }
                default:{
                    super.onManagerConnected(status);
                    break;
                }
            }
            super.onManagerConnected(status);
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        javaCameraView = (JavaCameraView)findViewById(R.id.java_camera_view);
        javaCameraView.setVisibility(SurfaceView.VISIBLE);
        javaCameraView.setCvCameraViewListener(this);
    }

    @Override
    protected  void onPause(){
        super.onPause();
        if(javaCameraView!=null)
            javaCameraView.disableView();
    }

    @Override
    protected  void onDestroy(){
        super.onDestroy();
        if(javaCameraView!=null)
            javaCameraView.disableView();
    }

    @Override
    protected  void onResume(){
        super.onResume();
        if(OpenCVLoader.initDebug()){
            Log.i(TAG, "OpenCV loaded successfully");
            mLoaderCallBack.onManagerConnected(LoaderCallbackInterface.SUCCESS);
        }
        else{
            Log.i(TAG, "OpenCV not loaded");
            OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_3_3_0, this, mLoaderCallBack);
        }
    }

    @Override
    public void onCameraViewStarted(int width, int height) {
        mRgba = new Mat(height, width, CvType.CV_8UC4);
    }

    @Override
    public void onCameraViewStopped() {
        mRgba.release();
    }

    @Override
    public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) {
        mRgba = inputFrame.rgba();
        return mRgba;
    }
}

这是AndroidManifest.xml：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.alexd.camerapreviewandroidthings">

    <uses-permission android:name="android.permission.CAMERA" />
    <uses-feature android:name="android.hardware.camera" />
    <uses-feature android:name="android.hardware.camera.autofocus" />
    <uses-feature android:name="android.hardware.camera2.*" />

    <uses-permission android:name="android.permission.WRITE_SETTINGS"/>
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="com.google.android.things.permission.MANAGE_INPUT_DRIVERS" />

    <application>
        <uses-library android:name="com.google.android.things" />

        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.IOT_LAUNCHER" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>
    </application>

</manifest>

这是Logcat错误：

09-13 08:50:29.812 1880-1880/? E/cutils-trace: Error opening trace file: No such file or directory (2)
09-13 08:50:30.026 1880-1880/? E/memtrack: Couldn't load memtrack module (No such file or directory)
09-13 08:50:30.026 1880-1880/? E/android.os.Debug: failed to load memtrack module: -2
09-13 08:50:32.090 1899-1899/? E/cutils-trace: Error opening trace file: No such file or directory (2)
09-13 08:50:32.300 1899-1899/? E/memtrack: Couldn't load memtrack module (No such file or directory)
09-13 08:50:32.300 1899-1899/? E/android.os.Debug: failed to load memtrack module: -2
09-13 08:50:35.356 1913-1913/? E/cutils-trace: Error opening trace file: No such file or directory (2)
09-13 08:50:35.573 1911-1911/? E/memtrack: Couldn't load memtrack module (No such file or directory)
09-13 08:50:35.573 1911-1911/? E/android.os.Debug: failed to load memtrack module: -2
09-13 08:50:37.811 150-150/? E/libEGL: called unimplemented OpenGL ES API
09-13 08:50:37.811 150-150/? E/SurfaceFlinger: glCheckFramebufferStatusOES error 0
09-13 08:50:37.812 150-150/? E/SurfaceFlinger: got GL_FRAMEBUFFER_COMPLETE_OES error while taking screenshot
09-13 09:00:00.843 412-429/system_process E/BatteryStatsService: no controller energy info supplied
09-13 09:00:00.848 412-429/system_process E/KernelWakelockReader: neither /proc/wakelocks nor /d/wakeup_sources exists
09-13 08:52:02.318 412-478/system_process E/TaskPersister: File error accessing recents directory (directory doesn't exist?).
09-13 08:51:58.902 155-155/? E/Camera2Client: notifyError: Error condition 0 reported by HAL, requestId -1
09-13 08:50:39.321 155-1838/? E/V4L2CameraHAL: virtual int v4l2_camera_hal::V4L2Camera::setupStreams(camera3_stream_configuration_t *):380: V4L2 only supports 1 stream configuration at a time (stream 0 is format 34, width 640, height 480, stream 1 is format 33, width 320, height 240).
09-13 08:50:39.321 155-1838/? E/Camera: int default_camera_hal::Camera::configureStreams(camera3_stream_configuration_t *):0: Failed to setup stream set
09-13 08:50:39.321 155-1838/? E/Camera3-Device: Camera 0: configureStreamsLocked: Set of requested inputs/outputs not supported by HAL
09-13 08:50:39.321 155-1838/? E/Camera3-Device: Camera 0: setUpRequestLocked: Can't set up streams: Invalid argument (-22)
09-13 08:50:39.321 155-1838/? E/Camera3-Device: Camera 0: convertMetadataListToRequestListLocked: Can't create capture request
09-13 08:50:39.321 155-1838/? E/Camera2-StreamingProcessor: startStream: Camera 0: Unable to set preview request to start preview: Invalid argument (-22)
09-13 08:50:39.321 155-1838/? E/Camera2Client: startPreviewL: Camera 0: Unable to start streaming preview: Invalid argument (-22)
09-13 08:50:39.262 162-1964/? E/FileSource: Failed to open file '/system/media/audio/ui/VideoRecord.ogg'. (No such file or directory)
09-13 08:50:39.262 162-1964/? E/GenericSource: Failed to create data source!
09-13 08:50:39.262 155-1838/? E/MediaPlayer: error (1, -2147483648)
09-13 08:50:39.266 162-1966/? E/FileSource: Failed to open file '/system/media/audio/ui/VideoStop.ogg'. (No such file or directory)
09-13 08:50:39.266 162-1966/? E/GenericSource: Failed to create data source!
java opencv camera android-things
3个回答
0
投票

android.permission.CAMERA权限是一种危险的权限，通常需要用户在标准Android上在运行时授予权限。在Android Things中，这些权限是自动授予的，但仅限于设备启动时。您需要执行以下操作之一才能将该权限授予您的应用：

  1. 首次安装后重新启动设备。这将授予重启权限。
  2. 第一次使用adb install -g <APK>手动安装APK。此标志在安装时授予所有请求的权限，因此您可以避免重新启动。
  3. 升级到Android Studio 3.0，它将自动为您安装这些权限，因此您无需执行＃1或＃2。
0
投票

我正在使用CSI相机在Raspberry 3B上使用Android Things。当我使用Android Camera1 API尝试打开相机时，我发现了一些错误

Can't Connect Camera using Android Camera (1) API on Raspberry Pi running AndroidThings

所以我尝试使用Android Camera2 API。当我尝试创建预览和捕获2个流会话时出错。我发现这个issue:37130806

它说Raspberry Pi相机HAL是使用V4L2实现的。不幸的是，V4L2接口与Android HAL要求并不完全兼容。值得注意的是，V4L2并未正式支持同时配置多个流。

所以也许这就是问题所在

0
投票

据我所知，android的东西目前不支持Graphic：硬件加速，因为它默认没有启用。根据问题

 javaCameraView = (JavaCameraView)findViewById(R.id.java_camera_view);
    javaCameraView.setVisibility(SurfaceView.VISIBLE);
    javaCameraView.setCvCameraViewListener(this);

在设置SurfaceView时需要硬件评估。 check this它取决于OpenGL ES

因此，为了使其运行起来就是实现类似下面的内容。

        mCameraThread = new HandlerThread("CameraBackground");

    mCameraThread.start();

    mCameraHandler = new Handler(mCameraThread.getLooper());

    mCamera = RCamera.getInstance();

    mCamera.initializeCamera(this, mCameraHandler, mOnImageAvailableListener);

    takePicHandler = new Handler();

    takePicHandler.post(runnable);

和处理程序和ImageReader.OnImageAvailableListener将是一样的

    private Runnable runnable = new Runnable() {
    @Override
    public void run() {
        Log.println(Log.INFO, "runnable", "running");

        mCamera.takePicture();

        takePicHandler.postDelayed(runnable, 0);

    }
};

private ImageReader.OnImageAvailableListener mOnImageAvailableListener =
        new ImageReader.OnImageAvailableListener() {
            @Override
            public void onImageAvailable(ImageReader reader) {
                Image image = reader.acquireLatestImage();
                // get image bytes
                ByteBuffer imageBuf = image.getPlanes()[0].getBuffer();

                final byte[] imageBytes = new byte[imageBuf.remaining()];

                imageBuf.get(imageBytes);

                image.close();

                onPictureTaken(imageBytes);
            }
        };

这将适用于Android东西和RPI3，干杯！

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