Camera中onPreviewFrame（）方法的视频方向旋转

转载链接：Camera中onPreviewFrame（）方法的视频方向旋转

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 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);
    }