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- public class YuvHelper {
- public static 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;
- }
- public 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;
- }
- public 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
- }
- 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);
- }
- }
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