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| package capture
|
| import (
| "errors"
| "fmt"
| "image"
| "time"
|
| "basic.com/valib/goffmpeg.git"
| "gocv.io/x/gocv"
| )
|
| // StreamMode stream mode
| type StreamMode int
|
| const (
| // Rtsp mode
| Rtsp = StreamMode(iota)
| // GB28181 mode
| GB28181
| )
|
| // PicExt file extention
| type PicExt string
|
| const (
| // PNGFileExt png
| PNGFileExt PicExt = PicExt(gocv.PNGFileExt)
| // JPEGFileExt jpeg
| JPEGFileExt PicExt = PicExt(gocv.JPEGFileExt)
| // GIFFileExt gif
| GIFFileExt PicExt = PicExt(gocv.GIFFileExt)
| // InvalidFileExt invalid
| InvalidFileExt PicExt = PicExt("")
| )
|
| // Capture pic
| func Capture(soFile string, m StreamMode, url string, ext PicExt, w, h, maxTry int) ([]byte, error) {
| gb := false
| if m == GB28181 {
| gb = true
| } else {
| return nil, errors.New("there is no this mode, try capture.Rtsp/capture.GB28181")
| }
|
| if ext == InvalidFileExt {
| ext = JPEGFileExt
| }
| var ret []byte
| var err error
|
| err = goffmpeg.InitFFmpeg(soFile)
| if err != nil {
| return nil, err
| }
|
| conf := goffmpeg.Config{
| Scale: goffmpeg.ScalePoint,
| Width: w,
| Height: h,
| GB: gb,
| CPU: true,
| }
| gf := goffmpeg.New(conf)
|
| ret, err = capt2Data(gf, url, gocv.FileExt(ext), w, h, maxTry)
|
| gf.Free()
| goffmpeg.FreeFFmpeg()
|
| return ret, err
| }
|
| func capt2Data(gf *goffmpeg.GoFFMPEG, url string, ext gocv.FileExt, w, h, maxTry int) ([]byte, error) {
|
| gf.Run(url)
| gf.BuildDecoder()
|
| tryTime := 0
|
| var picData []byte
| var err2 error
| for {
|
| data, wid, hei := gf.GetPicDecoder()
| if wid > 0 && hei > 0 {
| img, err := gocv.NewMatFromBytes(hei, wid, gocv.MatTypeCV8UC3, data)
| if err != nil {
| continue
| }
| pic := img
| if w >= 0 && h >= 0 {
| pic = gocv.NewMatWithSize(h, w, gocv.MatTypeCV8UC3)
| gocv.Resize(img, &pic, image.Pt(w, h), 0, 0, gocv.InterpolationDefault)
| }
| picData, err2 = gocv.IMEncode(ext, pic)
| if err2 != nil {
| continue
| }
| break
| } else {
| tryTime++
| if tryTime > maxTry {
| break
| }
| time.Sleep(time.Second)
| }
| }
|
| if tryTime > maxTry {
| err := fmt.Sprintf("try %d times to capture image, is url correct?\n", tryTime)
| return nil, errors.New(err)
| }
|
| return picData, nil
| }
|
|
