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amg.go
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amg.go
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package main
import (
"bytes"
"fmt"
"image"
"image/color"
_ "image/jpeg"
_ "image/png"
"net/http"
"os"
"os/exec"
ffmpeg "github.com/u2takey/ffmpeg-go"
)
var (
// ascii grayscale rank, If you find a better way to combine grayscale values than this, submit plz!
ramp = " .,-=+CNMGB@"
// specify Reverse to change contrast
Reverse = false
// specify ScaleX and ScaleY to resize the pictures
ScaleX, ScaleY = 3, 1
)
func init() {
if Reverse {
ramp = reverseString(ramp)
}
}
func reverseString(str string) string {
s := []rune(str)
l, r := 0, len(s)-1
for l < r {
s[l], s[r] = s[r], s[l]
l++
r--
}
return string(s)
}
// load image
func LoadImage(path string) (image.Image, error) {
if path[0:4] == "http" {
// http get
res, err := http.Get(path)
if err != nil {
return nil, err
}
defer res.Body.Close()
image, _, err := image.Decode(res.Body)
return image, err
} else {
// local path
f, err := os.Open(path)
if err != nil {
return nil, err
}
defer f.Close()
image, _, err := image.Decode(f)
return image, err
}
}
// rgb to gray
func rgb2gray(c color.Color) int {
r, g, b, _ := c.RGBA()
return int(0.299*float64(r) + 0.587*float64(g) + 0.114*float64(b))
}
// image to ascii character
func image2Ascii(img image.Image) []byte {
buf := bytes.Buffer{}
max := img.Bounds().Max
for y := 0; y < max.Y; y += ScaleX {
for x := 0; x < max.X; x += ScaleY {
c := avgPixel(img, x, y, ScaleX, ScaleY)
buf.WriteByte(ramp[len(ramp)*c/65536])
}
buf.WriteByte('\n')
}
return buf.Bytes()
}
func SaveFrameAsAscii(path string, index int) error {
// get frame from video
buf := bytes.NewBuffer(nil)
err := ffmpeg.Input(path).Filter("select", ffmpeg.Args{fmt.Sprintf("gte(n,%d)", index)}).
Output("pipe:", ffmpeg.KwArgs{"vframes": 1, "format": "image2", "vcodec": "png"}).
WithOutput(buf).Run()
if err != nil {
return err
}
// decode
img, _, err := image.Decode(buf)
if err != nil {
return err
}
// img to ascii
file, err := os.OpenFile(fmt.Sprintf("frames/frame:%d", index), os.O_RDWR|os.O_CREATE, 0755)
if err != nil {
return err
}
defer file.Close()
bytes := image2Ascii(img)
file.Write(bytes)
file.Close()
fmt.Printf("save video frame:%d as file success\n", index)
return nil
}
func avgPixel(img image.Image, x, y, w, h int) int {
cnt, sum, max := 0, 0, img.Bounds().Max
for i := x; i < x+w && i < max.X; i++ {
for j := y; j < y+h && j < max.Y; j++ {
sum += rgb2gray(img.At(i, j))
cnt++
}
}
return sum / cnt
}
func main() {
// img, err := LoadImage("https://i0.hdslb.com/bfs/new_dyn/615c8071c1c4beba47e6c7971b8561e4470962000.jpg")
// if err != nil {
// panic(err)
// }
// bytes := image2Ascii(img)
// fmt.Println(string(bytes))
// file := "download/test1.flv"
// for i := 0; ; i++ {
// if err := SaveFrameAsAscii(file, i); err != nil {
// break
// }
// }
// fmt.Println("ascii videos complete")
Play()
}
// play ascii video on console
func Play() {
cmd := exec.Command("clear")
cmd.Stdout = os.Stdout
for i := 0; ; i++ {
file, err := os.ReadFile(fmt.Sprintf("frames/frame:%d", i))
if err != nil {
break
}
cmd.Run()
os.Stdout.Write(file)
}
}