mirror of
https://github.com/giongto35/cloud-game.git
synced 2026-01-23 18:46:11 +00:00
52 lines
1.5 KiB
Go
52 lines
1.5 KiB
Go
package util
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import (
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"image"
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"unsafe"
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)
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// https://stackoverflow.com/questions/9465815/rgb-to-yuv420-algorithm-efficiency
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/*
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void rgba2yuv(void *destination, void *source, int width, int height, int stride) {
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const int image_size = width * height;
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unsigned char *rgba = source;
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unsigned char *dst_y = destination;
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unsigned char *dst_u = destination + image_size;
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unsigned char *dst_v = destination + image_size + image_size/4;
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// Y plane
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for( int y=0; y<height; ++y ) {
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for( int x=0; x<width; ++x ) {
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const int i = y*(width+stride) + x;
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*dst_y++ = ( ( 66*rgba[4*i] + 129*rgba[4*i+1] + 25*rgba[4*i+2] ) >> 8 ) + 16;
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}
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}
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// U plane
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for( int y=0; y<height; y+=2 ) {
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for( int x=0; x<width; x+=2 ) {
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const int i = y*(width+stride) + x;
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*dst_u++ = ( ( -38*rgba[4*i] + -74*rgba[4*i+1] + 112*rgba[4*i+2] ) >> 8 ) + 128;
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}
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}
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// V plane
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for( int y=0; y<height; y+=2 ) {
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for( int x=0; x<width; x+=2 ) {
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const int i = y*(width+stride) + x;
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*dst_v++ = ( ( 112*rgba[4*i] + -94*rgba[4*i+1] + -18*rgba[4*i+2] ) >> 8 ) + 128;
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}
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}
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}
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*/
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import "C"
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// RgbaToYuv convert to yuv from rgba
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func RgbaToYuv(rgba *image.RGBA) []byte {
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w := rgba.Rect.Max.X
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h := rgba.Rect.Max.Y
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size := int(float32(w*h) * 1.5)
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stride := rgba.Stride - w*4
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yuv := make([]byte, size, size)
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C.rgba2yuv(unsafe.Pointer(&yuv[0]), unsafe.Pointer(&rgba.Pix[0]), C.int(w), C.int(h), C.int(stride))
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return yuv
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}
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