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main.go
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main.go
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//go:build cgo
package main
import (
"image"
"image/jpeg"
"log"
"os"
"strconv"
"time"
"github.com/bluenviron/gortsplib/v4"
"github.com/bluenviron/gortsplib/v4/pkg/base"
"github.com/bluenviron/gortsplib/v4/pkg/format"
"github.com/bluenviron/gortsplib/v4/pkg/format/rtph265"
"github.com/bluenviron/mediacommon/pkg/codecs/h265"
"github.com/pion/rtp"
)
// This example shows how to
// 1. connect to a RTSP server
// 2. check if there's a H265 format
// 3. decode the H265 format into RGBA frames
// 4. convert frames to JPEG images and save them on disk
// This example requires the FFmpeg libraries, that can be installed with this command:
// apt install -y libavformat-dev libswscale-dev gcc pkg-config
func saveToFile(img image.Image) error {
// create file
fname := strconv.FormatInt(time.Now().UnixNano()/int64(time.Millisecond), 10) + ".jpg"
f, err := os.Create(fname)
if err != nil {
panic(err)
}
defer f.Close()
log.Println("saving", fname)
// convert to jpeg
return jpeg.Encode(f, img, &jpeg.Options{
Quality: 60,
})
}
func main() {
c := gortsplib.Client{}
// parse URL
u, err := base.ParseURL("rtsp://localhost:8554/mystream")
if err != nil {
panic(err)
}
// connect to the server
err = c.Start(u.Scheme, u.Host)
if err != nil {
panic(err)
}
defer c.Close()
// find available medias
desc, _, err := c.Describe(u)
if err != nil {
panic(err)
}
// find the H265 media and format
var forma *format.H265
medi := desc.FindFormat(&forma)
if medi == nil {
panic("media not found")
}
// setup RTP -> H265 decoder
rtpDec, err := forma.CreateDecoder()
if err != nil {
panic(err)
}
// setup H265 -> raw frames decoder
frameDec := &h265Decoder{}
err = frameDec.initialize()
if err != nil {
panic(err)
}
defer frameDec.close()
// if VPS, SPS and PPS are present into the SDP, send them to the decoder
if forma.VPS != nil {
frameDec.decode(forma.VPS)
}
if forma.SPS != nil {
frameDec.decode(forma.SPS)
}
if forma.PPS != nil {
frameDec.decode(forma.PPS)
}
// setup a single media
_, err = c.Setup(desc.BaseURL, medi, 0, 0)
if err != nil {
panic(err)
}
iframeReceived := false
saveCount := 0
// called when a RTP packet arrives
c.OnPacketRTP(medi, forma, func(pkt *rtp.Packet) {
// extract access units from RTP packets
au, err := rtpDec.Decode(pkt)
if err != nil {
if err != rtph265.ErrNonStartingPacketAndNoPrevious && err != rtph265.ErrMorePacketsNeeded {
log.Printf("ERR: %v", err)
}
return
}
// wait for an I-frame
if !iframeReceived {
if !h265.IsRandomAccess(au) {
log.Printf("waiting for an I-frame")
return
}
iframeReceived = true
}
for _, nalu := range au {
// convert NALUs into RGBA frames
img, err := frameDec.decode(nalu)
if err != nil {
panic(err)
}
// wait for a frame
if img == nil {
continue
}
// convert frame to JPEG and save to file
err = saveToFile(img)
if err != nil {
panic(err)
}
saveCount++
if saveCount == 5 {
log.Printf("saved 5 images, exiting")
os.Exit(1)
}
}
})
// start playing
_, err = c.Play(nil)
if err != nil {
panic(err)
}
// wait until a fatal error
panic(c.Wait())
}