mirror of
https://github.com/gen2brain/x264-go.git
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Optimize ToYCbCr
This commit is contained in:
parent
a04f0d0964
commit
54bdbefd12
@ -144,8 +144,8 @@ func NewEncoder(w io.Writer, opts *Options) (e *Encoder, err error) {
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func (e *Encoder) Encode(im image.Image) (err error) {
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var picOut x264c.Picture
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_, ok := im.(*image.RGBA)
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if ok {
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_, rgba := im.(*image.RGBA)
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if rgba {
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e.img.ToYCbCr(im)
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} else {
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e.img.ToYCbCrDraw(im)
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23
ycbcr.go
23
ycbcr.go
@ -4,6 +4,8 @@ import (
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"image"
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"image/color"
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"image/draw"
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"github.com/gen2brain/x264-go/yuv"
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)
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// YCbCr is an in-memory image of Y'CbCr colors.
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@ -40,8 +42,8 @@ func (p *YCbCr) ToYCbCrDraw(src image.Image) {
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draw.Draw(p, bounds, src, bounds.Min, draw.Src)
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}
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// ToYCbCr converts image.Image to YCbCr.
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func (p *YCbCr) ToYCbCr(src image.Image) {
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// ToYCbCrColor converts image.Image to YCbCr.
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func (p *YCbCr) ToYCbCrColor(src image.Image) {
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bounds := src.Bounds()
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for row := 0; row < bounds.Max.Y; row++ {
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@ -55,3 +57,20 @@ func (p *YCbCr) ToYCbCr(src image.Image) {
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}
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}
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}
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// ToYCbCr converts image.Image to YCbCr.
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func (p *YCbCr) ToYCbCr(src image.Image) {
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bounds := src.Bounds()
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width := bounds.Dx()
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height := bounds.Dy()
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lumaSize := int32(width * height)
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chromaSize := int32(width*height) / 4
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yuvProc := yuv.NewYuvImgProcessor(width, height)
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yCbCr := yuvProc.Process(src.(*image.RGBA)).Get()
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p.Y = yCbCr[:lumaSize]
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p.Cb = yCbCr[lumaSize : lumaSize+chromaSize]
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p.Cr = yCbCr[lumaSize+chromaSize:]
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}
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213
yuv/LICENSE
Normal file
213
yuv/LICENSE
Normal file
@ -0,0 +1,213 @@
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Apache License
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Version 2.0, January 2004
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http://www.apache.org/licenses/
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Copyright [2019] [Nguyen Huu Thanh]
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------------------------------------------------------------------------------------
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This product bundles various third-party components under other open source licenses.
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MIT License
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-----------
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||||
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||||
https://github.com/pion/webrtc/
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||||
https://github.com/fogleman/nes
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||||
https://github.com/poi5305/go-yuv2webRTC
|
||||
https://github.com/bchanx/animated-gameboy-in-css
|
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|
1
yuv/README
Normal file
1
yuv/README
Normal file
@ -0,0 +1 @@
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Imported from https://github.com/giongto35/cloud-game/tree/master/pkg/encoder/yuv
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3
yuv/go.mod
Normal file
3
yuv/go.mod
Normal file
@ -0,0 +1,3 @@
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module github.com/gen2brain/x264-go/yuv
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go 1.16
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42
yuv/options.go
Normal file
42
yuv/options.go
Normal file
@ -0,0 +1,42 @@
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package yuv
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type Options struct {
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ChromaP ChromaPos
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Threaded bool
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Threads int
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}
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func (o *Options) override(options ...Option) {
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for _, opt := range options {
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opt(o)
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}
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}
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type Option func(*Options)
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func Threaded(t bool) Option {
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return func(opts *Options) {
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opts.Threaded = t
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}
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}
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func Threads(t int) Option {
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return func(opts *Options) {
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opts.Threads = t
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}
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}
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func ChromaP(cp ChromaPos) Option {
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return func(opts *Options) {
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opts.ChromaP = cp
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}
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}
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// WithOptions used for config files.
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func WithOptions(arg Options) Option {
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return func(args *Options) {
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args.ChromaP = arg.ChromaP
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args.Threaded = arg.Threaded
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args.Threads = arg.Threads
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}
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}
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143
yuv/yuv.c
Normal file
143
yuv/yuv.c
Normal file
@ -0,0 +1,143 @@
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#include "yuv.h"
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// based on: https://stackoverflow.com/questions/9465815/rgb-to-yuv420-algorithm-efficiency
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// Converts RGBA image to YUV (I420) with BT.601 studio color range.
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void rgbaToYuv(void *destination, void *source, int width, int height, chromaPos chroma) {
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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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int r1, g1, b1, stride;
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// Y plane
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for (int y = 0; y < height; ++y) {
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stride = 4 * y * width;
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for (int x = 0; x < width; ++x) {
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r1 = 4 * x + stride;
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g1 = r1 + 1;
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b1 = g1 + 1;
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*dst_y++ = ((66 * rgba[r1] + 129 * rgba[g1] + 25 * rgba[b1]) >> 8) + 16;
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}
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}
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// U+V plane
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if (chroma == TOP_LEFT) {
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for (int y = 0; y < height; y += 2) {
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stride = 4 * y * width;
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for (int x = 0; x < width; x += 2) {
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r1 = 4 * x + stride;
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g1 = r1 + 1;
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b1 = g1 + 1;
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*dst_u++ = ((-38 * rgba[r1] + -74 * rgba[g1] + 112 * rgba[b1]) >> 8) + 128;
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*dst_v++ = ((112 * rgba[r1] + -94 * rgba[g1] + -18 * rgba[b1]) >> 8) + 128;
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}
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}
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} else if (chroma == BETWEEN_FOUR) {
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int r2, g2, b2, r3, g3, b3, r4, g4, b4;
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for (int y = 0; y < height; y += 2) {
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stride = 4 * y * width;
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for (int x = 0; x < width; x += 2) {
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// (1 2) x x
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// x x x x
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r1 = 4 * x + stride;
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g1 = r1 + 1;
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b1 = g1 + 1;
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r2 = r1 + 4;
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g2 = r2 + 1;
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b2 = g2 + 1;
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// x x x x
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// (3 4) x x
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r3 = r1 + 4 * width;
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g3 = r3 + 1;
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b3 = g3 + 1;
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r4 = r3 + 4;
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g4 = r4 + 1;
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b4 = g4 + 1;
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*dst_u++ = (((-38 * rgba[r1] + -74 * rgba[g1] + 112 * rgba[b1]) >> 8) +
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((-38 * rgba[r2] + -74 * rgba[g2] + 112 * rgba[b2]) >> 8) +
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((-38 * rgba[r3] + -74 * rgba[g3] + 112 * rgba[b3]) >> 8) +
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((-38 * rgba[r4] + -74 * rgba[g4] + 112 * rgba[b4]) >> 8) + 512) >> 2;
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*dst_v++ = (((112 * rgba[r1] + -94 * rgba[g1] + -18 * rgba[b1]) >> 8) +
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((112 * rgba[r2] + -94 * rgba[g2] + -18 * rgba[b2]) >> 8) +
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||||
((112 * rgba[r3] + -94 * rgba[g3] + -18 * rgba[b3]) >> 8) +
|
||||
((112 * rgba[r4] + -94 * rgba[g4] + -18 * rgba[b4]) >> 8) + 512) >> 2;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
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||||
|
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void chroma(void *destination, void *source, int pos, int deu, int dev, int width, int height, chromaPos chroma) {
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unsigned char *rgba = source + 4 * pos;
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unsigned char *dst_u = destination + deu + pos / 4;
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||||
unsigned char *dst_v = destination + dev + pos / 4;
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|
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int r1, g1, b1, stride;
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// U+V plane
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||||
if (chroma == TOP_LEFT) {
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for (int y = 0; y < height; y += 2) {
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||||
stride = 4 * y * width;
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||||
for (int x = 0; x < width; x += 2) {
|
||||
r1 = 4 * x + stride;
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||||
g1 = r1 + 1;
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||||
b1 = g1 + 1;
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*dst_u++ = ((-38 * rgba[r1] + -74 * rgba[g1] + 112 * rgba[b1]) >> 8) + 128;
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||||
*dst_v++ = ((112 * rgba[r1] + -94 * rgba[g1] + -18 * rgba[b1]) >> 8) + 128;
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||||
}
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||||
}
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||||
} else if (chroma == BETWEEN_FOUR) {
|
||||
int r2, g2, b2, r3, g3, b3, r4, g4, b4;
|
||||
|
||||
for (int y = 0; y < height; y += 2) {
|
||||
stride = 4 * y * width;
|
||||
for (int x = 0; x < width; x += 2) {
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||||
// (1 2) x x
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||||
// x x x x
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r1 = 4 * x + stride;
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||||
g1 = r1 + 1;
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||||
b1 = g1 + 1;
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r2 = r1 + 4;
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||||
g2 = r2 + 1;
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||||
b2 = g2 + 1;
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||||
// x x x x
|
||||
// (3 4) x x
|
||||
r3 = r1 + 4 * width;
|
||||
g3 = r3 + 1;
|
||||
b3 = g3 + 1;
|
||||
r4 = r3 + 4;
|
||||
g4 = r4 + 1;
|
||||
b4 = g4 + 1;
|
||||
*dst_u++ = (((-38 * rgba[r1] + -74 * rgba[g1] + 112 * rgba[b1]) >> 8) +
|
||||
((-38 * rgba[r2] + -74 * rgba[g2] + 112 * rgba[b2]) >> 8) +
|
||||
((-38 * rgba[r3] + -74 * rgba[g3] + 112 * rgba[b3]) >> 8) +
|
||||
((-38 * rgba[r4] + -74 * rgba[g4] + 112 * rgba[b4]) >> 8) + 512) >> 2;
|
||||
*dst_v++ = (((112 * rgba[r1] + -94 * rgba[g1] + -18 * rgba[b1]) >> 8) +
|
||||
((112 * rgba[r2] + -94 * rgba[g2] + -18 * rgba[b2]) >> 8) +
|
||||
((112 * rgba[r3] + -94 * rgba[g3] + -18 * rgba[b3]) >> 8) +
|
||||
((112 * rgba[r4] + -94 * rgba[g4] + -18 * rgba[b4]) >> 8) + 512) >> 2;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
void luma(void *destination, void *source, int pos, int width, int height) {
|
||||
unsigned char *rgba = source + 4 * pos;
|
||||
unsigned char *dst_y = destination + pos;
|
||||
|
||||
int x, y, r1, g1, b1, stride;
|
||||
|
||||
// Y plane
|
||||
for (y = 0; y < height; ++y) {
|
||||
stride = 4 * y * width;
|
||||
for (x = 0; x < width; ++x) {
|
||||
r1 = 4 * x + stride;
|
||||
g1 = r1 + 1;
|
||||
b1 = g1 + 1;
|
||||
*dst_y++ = 16 + ((66 * rgba[r1] + 129 * rgba[g1] + 25 * rgba[b1]) >> 8);
|
||||
}
|
||||
}
|
||||
}
|
138
yuv/yuv.go
Normal file
138
yuv/yuv.go
Normal file
@ -0,0 +1,138 @@
|
||||
package yuv
|
||||
|
||||
import (
|
||||
"image"
|
||||
"runtime"
|
||||
"sync"
|
||||
"unsafe"
|
||||
)
|
||||
|
||||
/*
|
||||
#cgo CFLAGS: -Wall -O3
|
||||
#include "yuv.h"
|
||||
*/
|
||||
import "C"
|
||||
|
||||
type ImgProcessor interface {
|
||||
Process(rgba *image.RGBA) ImgProcessor
|
||||
Get() []byte
|
||||
}
|
||||
|
||||
type processor struct {
|
||||
Data []byte
|
||||
w, h int
|
||||
pos ChromaPos
|
||||
|
||||
// cache
|
||||
dst unsafe.Pointer
|
||||
ww C.int
|
||||
chroma C.chromaPos
|
||||
}
|
||||
|
||||
type threadedProcessor struct {
|
||||
*processor
|
||||
|
||||
// threading
|
||||
threads int
|
||||
chunk int
|
||||
|
||||
// cache
|
||||
chromaU C.int
|
||||
chromaV C.int
|
||||
}
|
||||
|
||||
type ChromaPos uint8
|
||||
|
||||
const (
|
||||
TopLeft ChromaPos = iota
|
||||
BetweenFour
|
||||
)
|
||||
|
||||
// NewYuvImgProcessor creates new YUV image converter from RGBA.
|
||||
func NewYuvImgProcessor(w, h int, options ...Option) ImgProcessor {
|
||||
opts := &Options{
|
||||
ChromaP: BetweenFour,
|
||||
Threaded: true,
|
||||
Threads: runtime.NumCPU(),
|
||||
}
|
||||
opts.override(options...)
|
||||
|
||||
bufSize := int(float32(w*h) * 1.5)
|
||||
buf := make([]byte, bufSize)
|
||||
|
||||
processor := processor{
|
||||
Data: buf,
|
||||
chroma: C.chromaPos(opts.ChromaP),
|
||||
dst: unsafe.Pointer(&buf[0]),
|
||||
h: h,
|
||||
pos: opts.ChromaP,
|
||||
w: w,
|
||||
ww: C.int(w),
|
||||
}
|
||||
|
||||
if opts.Threaded {
|
||||
// chunks the image evenly
|
||||
chunk := h / opts.Threads
|
||||
if chunk%2 != 0 {
|
||||
chunk--
|
||||
}
|
||||
|
||||
return &threadedProcessor{
|
||||
chromaU: C.int(w * h),
|
||||
chromaV: C.int(w*h + w*h/4),
|
||||
chunk: chunk,
|
||||
processor: &processor,
|
||||
threads: opts.Threads,
|
||||
}
|
||||
}
|
||||
return &processor
|
||||
}
|
||||
|
||||
func (yuv *processor) Get() []byte {
|
||||
return yuv.Data
|
||||
}
|
||||
|
||||
// Process converts RGBA colorspace into YUV I420 format inside the internal buffer.
|
||||
// Non-threaded version.
|
||||
func (yuv *processor) Process(rgba *image.RGBA) ImgProcessor {
|
||||
C.rgbaToYuv(yuv.dst, unsafe.Pointer(&rgba.Pix[0]), yuv.ww, C.int(yuv.h), yuv.chroma)
|
||||
return yuv
|
||||
}
|
||||
|
||||
func (yuv *threadedProcessor) Get() []byte {
|
||||
return yuv.Data
|
||||
}
|
||||
|
||||
// Process converts RGBA colorspace into YUV I420 format inside the internal buffer.
|
||||
// Threaded version.
|
||||
//
|
||||
// We divide the input image into chunks by the number of available CPUs.
|
||||
// Each chunk should contain 2, 4, 6, and etc. rows of the image.
|
||||
//
|
||||
// 8x4 CPU (2)
|
||||
// x x x x x x x x | Coroutine 1
|
||||
// x x x x x x x x | Coroutine 1
|
||||
// x x x x x x x x | Coroutine 2
|
||||
// x x x x x x x x | Coroutine 2
|
||||
//
|
||||
func (yuv *threadedProcessor) Process(rgba *image.RGBA) ImgProcessor {
|
||||
src := unsafe.Pointer(&rgba.Pix[0])
|
||||
wg := sync.WaitGroup{}
|
||||
wg.Add(2 * yuv.threads)
|
||||
for i := 0; i < yuv.threads; i++ {
|
||||
pos, hh := C.int(yuv.w*i*yuv.chunk), C.int(yuv.chunk)
|
||||
// we need to know how many pixels left
|
||||
// if the image can't be divided evenly
|
||||
// between all the threads
|
||||
if i == yuv.threads-1 {
|
||||
hh = C.int(yuv.h - i*yuv.chunk)
|
||||
}
|
||||
go func() { defer wg.Done(); C.luma(yuv.dst, src, pos, yuv.ww, hh) }()
|
||||
go func() {
|
||||
defer wg.Done()
|
||||
C.chroma(yuv.dst, src, pos, yuv.chromaU, yuv.chromaV, yuv.ww, hh, yuv.chroma)
|
||||
}()
|
||||
}
|
||||
wg.Wait()
|
||||
return yuv
|
||||
}
|
23
yuv/yuv.h
Normal file
23
yuv/yuv.h
Normal file
@ -0,0 +1,23 @@
|
||||
typedef enum {
|
||||
// It will take each TL pixel for chroma values.
|
||||
// XO X XO X
|
||||
// X X X X
|
||||
TOP_LEFT = 0,
|
||||
// It will take an average color from the 2x2 pixel group for chroma values.
|
||||
// X X X X
|
||||
// O O
|
||||
// X X X X
|
||||
BETWEEN_FOUR = 1
|
||||
} chromaPos;
|
||||
|
||||
// Converts RGBA image to YUV (I420) with BT.601 studio color range.
|
||||
void rgbaToYuv(void *destination, void *source, int width, int height, chromaPos chroma);
|
||||
|
||||
// Converts RGBA image chunk to YUV (I420) chroma with BT.601 studio color range.
|
||||
// pos contains a shift value for chunks.
|
||||
// deu, dev contains constant shifts for U, V planes in the resulting array.
|
||||
// chroma (0, 1) selects chroma estimation algorithm.
|
||||
void chroma(void *destination, void *source, int pos, int deu, int dev, int width, int height, chromaPos chroma);
|
||||
|
||||
// Converts RGBA image chunk to YUV (I420) luma with BT.601 studio color range.
|
||||
void luma(void *destination, void *source, int pos, int width, int height);
|
202
yuv/yuv_test.go
Normal file
202
yuv/yuv_test.go
Normal file
File diff suppressed because one or more lines are too long
Loading…
Reference in New Issue
Block a user