使用go语言编写一个播放器，直接看效果

2022-03-11 13-55-03屏幕截图.png

整体思路是使用ffmpeg解码，然后使用xui进行渲染，音频播放暂时还没调通，以下是源码

package main

import (
    "github.com/nareix/joy4/av"
    "github.com/nareix/joy4/av/avutil"
    "github.com/nareix/joy4/cgo/ffmpeg"
    "github.com/nareix/joy4/format"
    "github.com/tenny1225/xui"
    "image"
    "math"
    "time"
)

type TestView struct {
    *xui.View
    img *image.YCbCr
}

func (v *TestView) Draw(canvas xui.XCanvas) {
    if v.img == nil {
        return

    }

    iw, ih := float64((*v.img).Bounds().Dx()), float64((*v.img).Bounds().Dy())
    w, h := v.Window.GetSize()
    s := math.Min(float64(w)/iw, float64(h)/ih)
    canvas.Save()
    canvas.SetScale(s, s)

    canvas.DrawImage(-(iw - float64(w))/2, -(ih - float64(h))/2, (*v.img).SubImage((*v.img).Bounds()))
    canvas.Restore()

}

//func (v *TestView) MeasureSize(w, h float64) (float64, float64) {
//  return math.MaxFloat64, math.MaxFloat64
//}
func NewTestView(v *xui.View) xui.Viewer {

    view := &TestView{v, nil}
    view.Drawer = view.Draw
    //view.Measurer = view.MeasureSize
    return view
}

type TestPage struct {
    xui.BasePage
    Root xui.Viewer
}

func (p *TestPage) GetContentView() xui.Viewer {

    p.Root = NewTestView(&xui.View{

        Top:           10,
        Left:          10,
        FontPath:      "OPPOSans-M.ttf",
        FontSize:      15,
        Title:         "hello world",
        PaddingLeft:   8,
        PaddingTop:    8,
        PaddingRight:  8,
        PaddingBottom: 8,
    })
    return p.Root
}
func (p *TestPage) Create(data map[string]interface{}) {
    go func() {
        avfile, _ := avutil.Open("/home/xz/桌面/movie.mp4")
        streams, _ := avfile.Streams()
        var videoDecoder *ffmpeg.VideoDecoder
        for _, stream := range streams {
            if stream.Type().IsVideo() {
                vstream := stream.(av.VideoCodecData)
                videoDecoder, _ = ffmpeg.NewVideoDecoder(vstream)
                //fmt.Println(vstream.Type(), vstream.Width(), vstream.Height())
            }
        }
        for {

            pkt, e := avfile.ReadPacket()
            if e != nil {
                return
            }

            vframe, e := videoDecoder.Decode(pkt.Data)
            if e == nil {
                v := p.Root.(*TestView)
                v.img = &vframe.Image
            }

            time.Sleep(time.Millisecond * 22)
            //}
        }
        avfile.Close()
    }()

}
func main() {
    ctx := xui.NewXContext()
    ctx.Run(func() {
        w := xui.NewWindow("测试", 400, 400, 500, 500, true, ctx)
        w.AddRoute("test", &TestPage{})
        w.StartPage("test", nil, false)
    })
}

func init() {
    format.RegisterAll()
}