Created
April 24, 2014 00:41
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RGB To YUV420p
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void rgb2yuv420p(uint8_t *destination, uint8_t *rgb, size_t width, size_t height) | |
{ | |
size_t image_size = width * height; | |
size_t upos = image_size; | |
size_t vpos = upos + upos / 4; | |
size_t i = 0; | |
for( size_t line = 0; line < height; ++line ) | |
{ | |
if( !(line % 2) ) | |
{ | |
for( size_t x = 0; x < width; x += 2 ) | |
{ | |
uint8_t r = rgb[3 * i]; | |
uint8_t g = rgb[3 * i + 1]; | |
uint8_t b = rgb[3 * i + 2]; | |
destination[i++] = ((66*r + 129*g + 25*b) >> 8) + 16; | |
destination[upos++] = ((-38*r + -74*g + 112*b) >> 8) + 128; | |
destination[vpos++] = ((112*r + -94*g + -18*b) >> 8) + 128; | |
r = rgb[3 * i]; | |
g = rgb[3 * i + 1]; | |
b = rgb[3 * i + 2]; | |
destination[i++] = ((66*r + 129*g + 25*b) >> 8) + 16; | |
} | |
} | |
else | |
{ | |
for( size_t x = 0; x < width; x += 1 ) | |
{ | |
uint8_t r = rgb[3 * i]; | |
uint8_t g = rgb[3 * i + 1]; | |
uint8_t b = rgb[3 * i + 2]; | |
destination[i++] = ((66*r + 129*g + 25*b) >> 8) + 16; | |
} | |
} | |
} | |
} |
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this code cause image upside down,do you get a correct direction code