Camera中onPreviewFrame（）方法的视频方向旋转

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1、旋转90度

private byte[] rotateYUV420Degree90(byte[] data, int imageWidth, int imageHeight) {    byte [] yuv = new byte[imageWidth*imageHeight*3/2];    // Rotate the Y luma    int i = 0;    for(int x = 0;x < imageWidth;x++)    {        for(int y = imageHeight-1;y >= 0;y--)                                       {            yuv[i] = data[y*imageWidth+x];            i++;        }    }    // Rotate the U and V color components     i = imageWidth*imageHeight*3/2-1;    for(int x = imageWidth-1;x > 0;x=x-2)    {        for(int y = 0;y < imageHeight/2;y++)                                        {            yuv[i] = data[(imageWidth*imageHeight)+(y*imageWidth)+x];            i--;            yuv[i] = data[(imageWidth*imageHeight)+(y*imageWidth)+(x-1)];            i--;        }    }    return yuv;}

2.旋转180度

private static byte[] rotateYUV420Degree180(byte[] data, int imageWidth, int imageHeight) {    byte[] yuv = new byte[imageWidth * imageHeight * 3 / 2];    int i = 0;    int count = 0;    for (i = imageWidth * imageHeight - 1; i >= 0; i--) {        yuv[count] = data[i];        count++;    }    i = imageWidth * imageHeight * 3 / 2 - 1;    for (i = imageWidth * imageHeight * 3 / 2 - 1; i >= imageWidth            * imageHeight; i -= 2) {        yuv[count++] = data[i - 1];        yuv[count++] = data[i];    }    return yuv;}

3.旋转270度

public static byte[] rotateYUV420Degree270(byte[] data, int imageWidth,                                     int imageHeight) {    byte[] yuv = new byte[imageWidth * imageHeight * 3 / 2];    int nWidth = 0, nHeight = 0;    int wh = 0;    int uvHeight = 0;    if (imageWidth != nWidth || imageHeight != nHeight) {        nWidth = imageWidth;        nHeight = imageHeight;        wh = imageWidth * imageHeight;        uvHeight = imageHeight >> 1;// uvHeight = height / 2    }    // ??Y    int k = 0;    for (int i = 0; i < imageWidth; i++) {        int nPos = 0;        for (int j = 0; j < imageHeight; j++) {            yuv[k] = data[nPos + i];            k++;            nPos += imageWidth;        }    }    for (int i = 0; i < imageWidth; i += 2) {        int nPos = wh;        for (int j = 0; j < uvHeight; j++) {            yuv[k] = data[nPos + i];            yuv[k + 1] = data[nPos + i + 1];            k += 2;            nPos += imageWidth;        }    }    return rotateYUV420Degree180(yuv, imageWidth, imageHeight);}

注意：以上方法需要在callback的onPreviewFrame（）中调用

而且需要把原先

EncoderDebugger debugger = EncoderDebugger.debug(mSettings, mQuality.resX, mQuality.resY);

中参数 mQuality.resX, mQuality.resY调换顺序以防花屏

EncoderDebugger debugger = EncoderDebugger.debug(mSettings, mQuality.resY, mQuality.resX);mPPS =debugger.getB64PPS();mSPS = debugger.getB64SPS();mProfilLevel = MP4Parser.toHexString(Base64.decode(mPPS, Base64.NO_WRAP),1,3);

这种方法效果比较合适，直接是转换数据。也查到了转换成jpeg格式，转换图片方向，再转成流传出去，这个方法时进行了压缩，数据减少导致编解码时buffer数组获取数据出问题。

结合

OrientationEventListener中的下例方法，进行屏幕方向检测，获取方向，以便方向旋转的判断选择。

@Overridepublic void onOrientationChanged(int orientation) {    this.Orientation=orientation;    Log.d("OrientationDetector","当前的传感器方向为"+orientation);    if (orientation == ORIENTATION_UNKNOWN) return;    Camera.CameraInfo info =            new Camera.CameraInfo();    Camera.getCameraInfo(0, info);    orientation = (orientation + 45) / 90 * 90;    if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {        rotation = (info.orientation - orientation + 360) % 360;    } else {  // back-facing camera        rotation = (info.orientation + orientation) % 360;    }    System.out.println("获取相机度数：  "+ rotation);    if (camera!=null){        Camera.Parameters parameters = camera.getParameters();        parameters.setRotation(rotation);        camera.setParameters(parameters);    }}

public int getOrientation(){//对外提供方向0,90,180,270 四个参数    return rotation;}

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