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main.go
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//go:build cgo
package main
import (
"log"
"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/rtpvp8"
"github.com/pion/rtp"
)
// This example shows how to
// 1. connect to a RTSP server
// 2. check if there's an VP8 format
// 3. decode the VP8 stream into RGBA frames
// This example requires the FFmpeg libraries, that can be installed with this command:
// apt install -y libavcodec-dev libswscale-dev gcc pkg-config
func main() {
c := gortsplib.Client{}
// parse URL
u, err := base.ParseURL("rtsp://myuser:mypass@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 VP8 media and format
var forma *format.VP8
medi := desc.FindFormat(&forma)
if medi == nil {
panic("media not found")
}
// setup RTP -> VP8 decoder
rtpDec, err := forma.CreateDecoder()
if err != nil {
panic(err)
}
// setup VP8 -> RGBA decoder
vp8Dec := &vp8Decoder{}
err = vp8Dec.initialize()
if err != nil {
panic(err)
}
defer vp8Dec.close()
// setup a single media
_, err = c.Setup(desc.BaseURL, medi, 0, 0)
if err != nil {
panic(err)
}
// called when a RTP packet arrives
c.OnPacketRTP(medi, forma, func(pkt *rtp.Packet) {
// decode timestamp
pts, ok := c.PacketPTS2(medi, pkt)
if !ok {
log.Printf("waiting for timestamp")
return
}
// extract access units from RTP packets
au, err := rtpDec.Decode(pkt)
if err != nil {
if err != rtpvp8.ErrNonStartingPacketAndNoPrevious && err != rtpvp8.ErrMorePacketsNeeded {
log.Printf("ERR: %v", err)
}
return
}
// convert VP8 access units into RGBA frames
img, err := vp8Dec.decode(au)
if err != nil {
panic(err)
}
// wait for a frame
if img == nil {
return
}
log.Printf("decoded frame with PTS %v and size %v", pts, img.Bounds().Max)
})
// start playing
_, err = c.Play(nil)
if err != nil {
panic(err)
}
// wait until a fatal error
panic(c.Wait())
}