package service
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import (
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"bytes"
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"context"
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"decoder/valib/goffmpeg"
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"decoder/valib/ipc"
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"encoding/gob"
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"fmt"
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)
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// Decoder decoder ingo
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type Decoder struct {
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ctxIPC *ContextIPC
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cameraID string
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streamURL string
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ipcURL string
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ffmpeg *goffmpeg.GoFFMPEG
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}
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// NewDecoder decoder
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func NewDecoder(cameraID, streamURL, ipcURL string) *Decoder {
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ctx, cancel := context.WithCancel(context.Background())
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return &Decoder{
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ctxIPC: &ContextIPC{ctx, cancel},
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cameraID: cameraID,
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streamURL: streamURL,
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ipcURL: ipcURL,
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}
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}
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func (dec *Decoder) serializeImageInfo(img <-chan ImageInfo, data chan<- []byte) {
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for {
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select {
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case <-dec.ctxIPC.ctx.Done():
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fmt.Println("stop decoder")
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return
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case i := <-img:
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var buf bytes.Buffer
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enc := gob.NewEncoder(&buf)
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if err := enc.Encode(i); err != nil {
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fmt.Println("gob encode camera image error", err)
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continue
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}
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b := buf.Bytes()
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data <- b
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}
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}
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}
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// Run run a decoder
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func (dec *Decoder) Run(asServer bool) {
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var i *ipc.IPC
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if asServer {
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i = ipc.NewServer(dec.ctxIPC.ctx, dec.ipcURL)
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} else {
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i = ipc.NewClient(dec.ctxIPC.ctx, dec.ipcURL)
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}
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gf := goffmpeg.New()
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if gf != nil {
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dec.ffmpeg = gf
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}
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imageChan := make(chan ImageInfo)
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dataChan := make(chan []byte)
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go dec.serializeImageInfo(imageChan, dataChan)
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gf.ActiveDecoder(func(d *[]byte, w, h *int) {
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fmt.Println("get a pic")
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if *w > 0 && *h > 0 {
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i := ImageInfo{*d, *w, *h, dec.cameraID}
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imageChan <- i
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} else {
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fmt.Println("decode jpg error")
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}
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})
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gf.Run(dec.streamURL)
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i.SendFromChannel(dataChan)
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}
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// Stop stop run decoder, must run in goroutine
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func (dec *Decoder) Stop() {
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dec.ffmpeg.Free()
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dec.ctxIPC.cancel()
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}
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