android开发 视频流 YUV应用，镜像

三个角度方法。180°可以用于镜像问题

//i420顺时针旋转90 ；
int rotateYUV420Degree90(byte[] dstyuv,byte[] srcdata, int imageWidth, int imageHeight) {

    int i = 0, j = 0;

    int index = 0;
    int tempindex = 0;
    int div = 0;
    int ustart = imageWidth *imageHeight;
    for (i = 0; i <imageHeight; i++) {
        div= i;
        tempindex= ustart;
        for (j = 0; j <imageWidth; j++) {

            tempindex-= imageWidth;

            dstyuv[index++]= srcdata[tempindex + div];
        }
    }


    int udiv = imageWidth *imageHeight / 4;

    int uWidth = imageWidth /2;
    int uHeight = imageHeight /2;
    index= ustart;
    for (i = 0; i < uHeight;i++) {
        div= i ;
        tempindex= ustart+udiv;
        for (j = 0; j < uWidth;j++) {
            tempindex-= uWidth;
            dstyuv[index]= srcdata[tempindex + div];
            dstyuv[index+ udiv] = srcdata[tempindex + div + udiv];
            index++;
        }
    }
    return 0;

}

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int rotateYUV420Degree180(byte[] dstyuv,byte[] srcdata, int imageWidth, int imageHeight)
{

    int i = 0, j = 0;

    int index = 0;
    int tempindex = 0;

    int ustart = imageWidth *imageHeight;
    tempindex= ustart;
    for (i = 0; i <imageHeight; i++) {

        tempindex-= imageWidth;
        for (j = 0; j <imageWidth; j++) {

            dstyuv[index++] = srcdata[tempindex + j];
        }
    }

    int udiv = imageWidth *imageHeight / 4;

    int uWidth = imageWidth /2;
    int uHeight = imageHeight /2;
    index= ustart;
    tempindex= ustart+udiv;
    for (i = 0; i < uHeight;i++) {

        tempindex-= uWidth;
        for (j = 0; j < uWidth;j++) {

            dstyuv[index]= srcdata[tempindex + j];
            dstyuv[index+ udiv] = srcdata[tempindex + j + udiv];
            index++;
        }
    }
    return 0;
}

///====================================

public int rotateYUV420Degree270(byte[] dstyuv,byte[] srcdata, int imageWidth, int imageHeight) {

     int i = 0, j = 0;

     int index = 0;
     int tempindex = 0;
     int div = 0;
     for (i = 0; i <imageHeight; i++) {
         div= i +1;
         tempindex= 0;
         for (j = 0; j <imageWidth; j++) {

             tempindex+= imageWidth;
             dstyuv[index++]= srcdata[tempindex-div];
         }
     }

     int start =imageWidth*imageHeight;
     int udiv = imageWidth *imageHeight / 4;

     int uWidth = imageWidth /2;
     int uHeight = imageHeight /2;
     index= start;
     for (i = 0; i < uHeight;i++) {
         div= i +1;
         tempindex= start;
         for (j = 0; j < uWidth;j++) {
             tempindex += uWidth;
             dstyuv[index]= srcdata[tempindex-div];
             dstyuv[index+udiv]= srcdata[tempindex-div+udiv];
             index++;
         }
     }

     return 0;

 }

-------------------------------------------------------------------------

镜像方法

//mirro 
void Mirror(byte[] yuv_temp, int nw, int nh, int w,
            int h) {
    int deleteW = (nw - h) / 2;
    int deleteH = (nh - w) / 2;
    int i, j;

    int a, b;
    byte temp;
    //mirror y
    for (i = 0; i < h; i++){
        a= i * w;
        b= (i + 1) * w - 1;
        while (a < b) {
            temp= yuv_temp[a];
            yuv_temp[a]= yuv_temp[b];
            yuv_temp[b]= temp;
            a++;
            b--;
        }
    }
    //mirror u
    int uindex = w * h;
    for (i = 0; i < h / 2;i++) {
        a = i * w / 2;
        b= (i + 1) * w / 2 - 1;
        while (a < b) {
            temp= yuv_temp[a + uindex];
            yuv_temp[a+ uindex] = yuv_temp[b + uindex];
            yuv_temp[b+ uindex] = temp;
            a++;
            b--;
        }
    }
    //mirror v
    uindex= w * h / 4 * 5;
    for (i = 0; i < h / 2;i++) {
        a= i * w / 2;
        b= (i + 1) * w / 2 - 1;
        while (a < b) {
            temp= yuv_temp[a + uindex];
            yuv_temp[a+ uindex] = yuv_temp[b + uindex];
            yuv_temp[b+ uindex] = temp;
            a++;
            b--;
        }
    }

}