Created
January 10, 2018 19:37
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Rotacionar imagens YUV
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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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