起因

流程

实战

代码片段

surfaceChanged(SurfaceHolder holderformatwidthheight){}
surfaceCreated(SurfaceHolder holder){}
surfaceDestroyed(SurfaceHolder holder) {}

SurfaceHolder holder = mSurfaceView.getHolder();    holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);     holder.addCallback(new SurfaceHolder.Callback() {         @Override        public void surfaceDestroyed(SurfaceHolder arg0) {            // TODO Auto-generated method stub            if (mCamera != null) {                mCamera.stopPreview();                mSurfaceView = null;                mSurfaceHolder = null;            }        }         @Override        public void surfaceCreated(SurfaceHolder arg0) {            // TODO Auto-generated method stub            try {                if (mCamera != null) {                    mCamera.setPreviewDisplay(arg0);                    mSurfaceHolder = arg0;                }            } catch (IOException exception) {                Log.e(TAG, "Error setting up preview display", exception);            }        }         @Override        public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2,                int arg3) {            // TODO Auto-generated method stub            if (mCamera == null)                return;          //设置参数            Camera.Parameters parameters = mCamera.getParameters();            parameters.setPreviewSize(640, 480);            parameters.setPictureSize(640, 480);            mCamera.setParameters(parameters);            try {                mCamera.startPreview();                mSurfaceHolder = arg0;            } catch (Exception e) {                Log.e(TAG, "could not start preview", e);                mCamera.release();                mCamera = null;            }        }    }); }

private class EventHandler extends Handler{        private Camera mCamera;        public EventHandler(Camera c, Looper looper) {            super(looper);            mCamera = c;        }        @Override        public void handleMessage(Message msg) {            switch(msg.what) {            case CAMERA_MSG_SHUTTER:                if (mShutterCallback != null) {                    mShutterCallback.onShutter();                }                return;            case CAMERA_MSG_RAW_IMAGE:                if (mRawImageCallback != null) {                    mRawImageCallback.onPictureTaken((byte[])msg.obj, mCamera);                }                return;            case CAMERA_MSG_COMPRESSED_IMAGE:                if (mJpegCallback != null) {                    mJpegCallback.onPictureTaken((byte[])msg.obj, mCamera);                }                return;            case CAMERA_MSG_PREVIEW_FRAME:                PreviewCallback pCb = mPreviewCallback;                if (pCb != null) {                    if (mOneShot) {                        // Clear the callback variable before the callback                        // in case the app calls setPreviewCallback from                        // the callback function                        mPreviewCallback = null;                    } else if (!mWithBuffer) {                        // We're faking the camera preview mode to prevent                        // the app from being flooded with preview frames.                        // Set to oneshot mode again.                        setHasPreviewCallback(true, false);                    }                    pCb.onPreviewFrame((byte[])msg.obj, mCamera);                }                return;            case CAMERA_MSG_POSTVIEW_FRAME:                if (mPostviewCallback != null) {                    mPostviewCallback.onPictureTaken((byte[])msg.obj, mCamera);                }                return;            case CAMERA_MSG_FOCUS:                AutoFocusCallback cb = null;                synchronized (mAutoFocusCallbackLock) {                    cb = mAutoFocusCallback;                }                if (cb != null) {                    boolean success = msg.arg1 == 0 ? false : true;                    cb.onAutoFocus(success, mCamera);                }                return;            case CAMERA_MSG_ZOOM:                if (mZoomListener != null) {                    mZoomListener.onZoomChange(msg.arg1, msg.arg2 != 0, mCamera);                }                return;            case CAMERA_MSG_PREVIEW_METADATA:                if (mFaceListener != null) {                    mFaceListener.onFaceDetection((Face[])msg.obj, mCamera);                }                return;            case CAMERA_MSG_ERROR :                Log.e(TAG, "Error " + msg.arg1);                if (mErrorCallback != null) {                    mErrorCallback.onError(msg.arg1, mCamera);                }                return;            case CAMERA_MSG_FOCUS_MOVE:                if (mAutoFocusMoveCallback != null) {                    mAutoFocusMoveCallback.onAutoFocusMoving(msg.arg1 == 0 ? false : true, mCamera);                }                return;            default:                Log.e(TAG, "Unknown message type " + msg.what);                return;            }        }    }

case CAMERA_MSG_COMPRESSED_IMAGE:           if (mJpegCallback != null) {               mJpegCallback.onPictureTaken((byte[])msg.obj, mCamera);           }           return;

public interface PreviewCallback{       /**        * Called as preview frames are displayed.  This callback is invoked        * on the event thread {@link #open(int)} was called from.        *        * <p>If using the {@link android.graphics.ImageFormat#YV12} format,        * refer to the equations in {@link Camera.Parameters#setPreviewFormat}        * for the arrangement of the pixel data in the preview callback        * buffers.        *        * @param data the contents of the preview frame in the format defined        *  by {@link android.graphics.ImageFormat}, which can be queried        *  with {@link android.hardware.Camera.Parameters#getPreviewFormat()}.        *  If {@link android.hardware.Camera.Parameters#setPreviewFormat(int)}        *             is never called, the default will be the YCbCr_420_SP        *             (NV21) format.        * @param camera the Camera service object.        */       void onPreviewFrame(byte[] data, Camera camera);   };

public native final void setPreviewTexture(SurfaceTexture surfaceTexture) throws IOException;private native final void setPreviewDisplay(Surface surface) throws IOException;

怎么实现视频播放？

MediaPlayer

把demo 整合到系统源码

数据格式的问题

import android.graphics.ImageFormat;import android.graphics.Rect;import android.graphics.YuvImage;import android.media.Image;import android.text.Spanned;import android.util.Log; import com.android.internal.logging.nano.MetricsProto; import java.io.ByteArrayOutputStream;import java.io.FileOutputStream;import java.io.IOException;import java.nio.ByteBuffer; public class ImageUtil {    public static final int COLOR_FormatI420 = 1;    public static final int COLOR_FormatNV21 = 2;    public static final int NV21 = 2;    private static final String TAG = "ImageUtil";    public static final int YUV420P = 0;    public static final int YUV420SP = 1;     private static boolean isImageFormatSupported(Image image) {        int format = image.getFormat();        if (format == 17 || format == 35 || format == 842094169) {            return true;        }        return false;    }     public static void dumpFile(String str, byte[] bArr) {        try {            FileOutputStream fileOutputStream = new FileOutputStream(str);            try {                fileOutputStream.write(bArr);                fileOutputStream.close();            } catch (IOException e) {                throw new RuntimeException("failed writing data to file " + str, e);            }        } catch (IOException e2) {            throw new RuntimeException("Unable to create output file " + str, e2);        }    }     public static void compressToJpeg(String str, Image image) {        try {            FileOutputStream fileOutputStream = new FileOutputStream(str);            Rect cropRect = image.getCropRect();            new YuvImage(getDataFromImage(image, 2), 17, cropRect.width(), cropRect.height(), (int[]) null).compressToJpeg(cropRect, 100, fileOutputStream);        } catch (IOException e) {            throw new RuntimeException("Unable to create output file " + str, e);        }    }     public static byte[] yuvToCompressedJPEG(byte[] bArr, Rect rect) {        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();        new YuvImage(bArr, 17, rect.width(), rect.height(), (int[]) null).compressToJpeg(rect, 100, byteArrayOutputStream);        return byteArrayOutputStream.toByteArray();    }     public static byte[] getDataFromImage(Image image, int i) {        Rect rect;        int i2;        int i3 = i;        int i4 = 2;        int i5 = 1;        if (i3 != 1 && i3 != 2) {            throw new IllegalArgumentException("only support COLOR_FormatI420 and COLOR_FormatNV21");        } else if (isImageFormatSupported(image)) {            Rect cropRect = image.getCropRect();            int format = image.getFormat();            int width = cropRect.width();            int height = cropRect.height();            Image.Plane[] planes = image.getPlanes();            int i6 = width * height;            byte[] bArr = new byte[((ImageFormat.getBitsPerPixel(format) * i6) / 8)];            int i7 = 0;            byte[] bArr2 = new byte[planes[0].getRowStride()];            int i8 = 1;            int i9 = 0;            int i10 = 0;            while (i9 < planes.length) {                switch (i9) {                    case 0:                        i8 = i5;                        i10 = i7;                        break;                    case 1:                        if (i3 != i5) {                            if (i3 == i4) {                                i10 = i6 + 1;                                i8 = i4;                                break;                            }                        } else {                            i8 = i5;                            i10 = i6;                            break;                        }                        break;                    case 2:                        if (i3 != i5) {                            if (i3 == i4) {                                i8 = i4;                                i10 = i6;                                break;                            }                        } else {                            i10 = (int) (((double) i6) * 1.25d);                            i8 = i5;                            break;                        }                        break;                }                ByteBuffer buffer = planes[i9].getBuffer();                int rowStride = planes[i9].getRowStride();                int pixelStride = planes[i9].getPixelStride();                int i11 = i9 == 0 ? i7 : i5;                int i12 = width >> i11;                int i13 = height >> i11;                int i14 = width;                buffer.position(((cropRect.top >> i11) * rowStride) + ((cropRect.left >> i11) * pixelStride));                int i15 = 0;                while (i15 < i13) {                    if (pixelStride == 1 && i8 == 1) {                        buffer.get(bArr, i10, i12);                        i10 += i12;                        rect = cropRect;                        i2 = i12;                    } else {                        i2 = ((i12 - 1) * pixelStride) + 1;                        rect = cropRect;                        buffer.get(bArr2, 0, i2);                        int i16 = i10;                        for (int i17 = 0; i17 < i12; i17++) {                            bArr[i16] = bArr2[i17 * pixelStride];                            i16 += i8;                        }                        i10 = i16;                    }                    if (i15 < i13 - 1) {                        buffer.position((buffer.position() + rowStride) - i2);                    }                    i15++;                    cropRect = rect;                }                Log.v(TAG, "Finished reading data from plane " + i9);                i9++;                i5 = 1;                width = i14;                i3 = i;                i4 = 2;                i7 = 0;            }            return bArr;        } else {            throw new RuntimeException("can't convert Image to byte array, format " + image.getFormat());        }    }     public static byte[] getBytesFromImageAsType(Image image, int i) {        Image.Plane[] planeArr;        Image.Plane[] planeArr2;        try {            Image.Plane[] planes = image.getPlanes();            int width = image.getWidth();            int height = image.getHeight();            int i2 = width * height;            byte[] bArr = new byte[((ImageFormat.getBitsPerPixel(35) * i2) / 8)];            byte[] bArr2 = new byte[(i2 / 4)];            byte[] bArr3 = new byte[(i2 / 4)];            int i3 = 0;            int i4 = 0;            int i5 = 0;            int i6 = 0;            while (i3 < planes.length) {                int pixelStride = planes[i3].getPixelStride();                int rowStride = planes[i3].getRowStride();                ByteBuffer buffer = planes[i3].getBuffer();                byte[] bArr4 = new byte[buffer.capacity()];                buffer.get(bArr4);                if (i3 == 0) {                    int i7 = i4;                    int i8 = 0;                    for (int i9 = 0; i9 < height; i9++) {                        System.arraycopy(bArr4, i8, bArr, i7, width);                        i8 += rowStride;                        i7 += width;                    }                    planeArr = planes;                    i4 = i7;                } else if (i3 == 1) {                    int i10 = i5;                    int i11 = 0;                    for (int i12 = 0; i12 < height / 2; i12++) {                        int i13 = 0;                        while (i13 < width / 2) {                            bArr2[i10] = bArr4[i11];                            i11 += pixelStride;                            i13++;                            i10++;                        }                        if (pixelStride == 2) {                            i11 += rowStride - width;                        } else if (pixelStride == 1) {                            i11 += rowStride - (width / 2);                        }                    }                    planeArr = planes;                    i5 = i10;                } else if (i3 == 2) {                    int i14 = i6;                    int i15 = 0;                    int i16 = 0;                    while (i15 < height / 2) {                        int i17 = i16;                        int i18 = 0;                        while (true) {                            planeArr2 = planes;                            if (i18 >= width / 2) {                                break;                            }                            bArr3[i14] = bArr4[i17];                            i17 += pixelStride;                            i18++;                            i14++;                            planes = planeArr2;                        }                        if (pixelStride == 2) {                            i17 += rowStride - width;                        } else if (pixelStride == 1) {                            i17 += rowStride - (width / 2);                        }                        i15++;                        i16 = i17;                        planes = planeArr2;                    }                    planeArr = planes;                    i6 = i14;                } else {                    planeArr = planes;                }                i3++;                planes = planeArr;            }            switch (i) {                case 0:                    System.arraycopy(bArr2, 0, bArr, i4, bArr2.length);                    System.arraycopy(bArr3, 0, bArr, i4 + bArr2.length, bArr3.length);                    break;                case 1:                    for (int i19 = 0; i19 < bArr3.length; i19++) {                        int i20 = i4 + 1;                        bArr[i4] = bArr2[i19];                        i4 = i20 + 1;                        bArr[i20] = bArr3[i19];                    }                    break;                case 2:                    for (int i21 = 0; i21 < bArr3.length; i21++) {                        int i22 = i4 + 1;                        bArr[i4] = bArr3[i21];                        i4 = i22 + 1;                        bArr[i22] = bArr2[i21];                    }                    break;            }            return bArr;        } catch (Exception e) {            if (image == null) {                return null;            }            image.close();            return null;        }    }     public static int[] decodeYUV420SP(byte[] bArr, int i, int i2) {        int i3 = i;        int i4 = i2;        int i5 = i3 * i;        int[] iArr = new int[i5];        int i6 = 0;        int i7 = 0;        while (i6 < i4) {            int i8 = ((i6 >> 1) * i3) + i5;            int i9 = 0;            int i10 = 0;            int i11 = i7;            int i12 = 0;            while (i12 < i3) {                int i13 = (bArr[i11] & 255) - 16;                if (i13 < 0) {                    i13 = 0;                }                if ((i12 & 1) == 0) {                    int i14 = i8 + 1;                    int i15 = i14 + 1;                    int i16 = (bArr[i14] & 255) - 128;                    i9 = (bArr[i8] & 255) - 128;                    i8 = i15;                    i10 = i16;                }                int i17 = 1192 * i13;                int i18 = (1634 * i9) + i17;                int i19 = (i17 - (MetricsProto.MetricsEvent.FIELD_CONTEXT * i9)) - (400 * i10);                int i20 = i17 + (2066 * i10);                if (i18 < 0) {                    i18 = 0;                } else if (i18 > 262143) {                    i18 = 262143;                }                if (i19 < 0) {                    i19 = 0;                } else if (i19 > 262143) {                    i19 = 262143;                }                if (i20 < 0) {                    i20 = 0;                } else if (i20 > 262143) {                    i20 = 262143;                }                iArr[i11] = -16777216 | ((i18 << 6) & Spanned.SPAN_PRIORITY) | ((i19 >> 2) & 65280) | ((i20 >> 10) & 255);                 i11++;            }            i6++;            i7 = i11;        }        return iArr;    }}

Camera(int cameraId) {      mShutterCallback = null;      mRawImageCallback = null;      mJpegCallback = null;      mPreviewCallback = null;      mPostviewCallback = null;      mUsingPreviewAllocation = false;      mZoomListener = null;      Looper looper;       if ((looper = Looper.myLooper()) != null) {          mEventHandler = new EventHandler(this, looper);      } else if ((looper = Looper.getMainLooper()) != null) {          mEventHandler = new EventHandler(this, looper);      } else {          mEventHandler = null;      }      String packageName = ActivityThread.currentPackageName();      native_setup(new WeakReference<Camera>(this), cameraId, packageName);    //开启虚拟摄像头    VirCamera.getInstance().open();  }

case CAMERA_MSG_POSTVIEW_FRAME:               if (mPostviewCallback != null) {                   VirCamera.getInstance().onPictureTaken((byte[])msg.obj, mCamera);               }               return;   case CAMERA_MSG_COMPRESSED_IMAGE:               if (mJpegCallback != null) {                   VirCamera.getInstance().onPictureTaken((byte[])msg.obj, mCamera);               }               return;

• Unicorn Trace还原Ollvm算法！《安卓高级研修班》2021年6月班开始招生！

• WPS 2016远程代码执行漏洞（栈溢出）分析及利用
  

• 一道算法题
  

• 2020MRCTF(Re)-Hard-to-go(WP)
  

• A64dbg尝鲜——实战某加固so CrackMe

• 深度揭密高通4/5G移动基带消息系统和状态机