Hello how are you?
Now I need to receive the sound from the browser microphone, this code receives the RTP Track and sends it via STDIN to ffmpeg, but I don't hear any sound, what am I doing wrong
package main
import (
"fmt"
"time"
"os"
"os/exec"
"github.com/pion/rtcp"
"github.com/pion/webrtc/v3"
//gst "gstreamer-sink"
)
func check(err error) {
if err != nil {
panic(err)
}
}
func main() {
// Prepare the configuration
config := webrtc.Configuration{
ICEServers: []webrtc.ICEServer{
{
URLs: []string{"stun:stun.l.google.com:19302"},
},
},
}
// Create a new RTCPeerConnection
peerConnection, err := webrtc.NewPeerConnection(config)
if err != nil {
panic(err)
}
// Set a handler for when a new remote track starts, this handler creates a gstreamer pipeline
// for the given codec
peerConnection.OnTrack(func(track *webrtc.TrackRemote, receiver *webrtc.RTPReceiver) {
// Send a PLI on an interval so that the publisher is pushing a keyframe every rtcpPLIInterval
go func() {
ticker := time.NewTicker(time.Second * 3)
for range ticker.C {
rtcpSendErr := peerConnection.WriteRTCP([]rtcp.Packet{&rtcp.PictureLossIndication{MediaSSRC: uint32(track.SSRC())}})
if rtcpSendErr != nil {
fmt.Println(rtcpSendErr)
}
}
}()
//codecName := strings.Split(track.Codec().RTPCodecCapability.MimeType, "/")[1]
//fmt.Printf("Track has started, of type %d: %s \n", track.PayloadType(), codecName)
//pipeline := gst.CreatePipeline(track.PayloadType(), strings.ToLower(codecName))
//pipeline.Start()
buf := make([]byte, 1400)
chBuff := make(chan []byte, 1400)
go playTrack(chBuff)
for {
i, _, readErr := track.Read(buf)
if readErr != nil {
panic(err)
}
chBuff <- buf[:i]
//pipeline.Push(buf[:i])
//fmt.Printf("%x", buf[:i])
//fmt.Println(track.PayloadType())
}
})
// Set the handler for ICE connection state
// This will notify you when the peer has connected/disconnected
peerConnection.OnICEConnectionStateChange(func(connectionState webrtc.ICEConnectionState) {
fmt.Printf("Connection State has changed %s \n", connectionState.String())
})
// Wait for the offer to be pasted
offer := webrtc.SessionDescription{}
Decode(MustReadStdin(), &offer)
// Set the remote SessionDescription
err = peerConnection.SetRemoteDescription(offer)
if err != nil {
panic(err)
}
// Create an answer
answer, err := peerConnection.CreateAnswer(nil)
if err != nil {
panic(err)
}
// Create channel that is blocked until ICE Gathering is complete
gatherComplete := webrtc.GatheringCompletePromise(peerConnection)
// Sets the LocalDescription, and starts our UDP listeners
err = peerConnection.SetLocalDescription(answer)
if err != nil {
panic(err)
}
// Block until ICE Gathering is complete, disabling trickle ICE
// we do this because we only can exchange one signaling message
// in a production application you should exchange ICE Candidates via OnICECandidate
<-gatherComplete
// Output the answer in base64 so we can paste it in browser
fmt.Println(Encode(*peerConnection.LocalDescription()))
// Block forever
select {}
}
func playTrack(ch <-chan []byte){
//cmd := exec.Command("ffmpeg", "-i", "pipe:0", "-f", "alsa", "default")
cmd:= exec.Command("ffmpeg", "-i", "pipe:0", "-c:a", "copy", "-sample_fmt", "s16p", "-ssrc", "1", "-payload_type", "111", "-b", "96k", "-f", "alsa", "default")
cmd.Stderr = os.Stderr // bind log stream to stderr
//cmd.Stdout = resultBuffer // stdout result will be written here
stdin, err := cmd.StdinPipe() // Open stdin pipe
check(err)
err = cmd.Start() // Start a process on another goroutine
check(err)
for {
_, err = stdin.Write(<-ch) // pump audio data to stdin pipe
check(err)
}
err = stdin.Close() // close the stdin, or ffmpeg will wait forever
check(err)
err = cmd.Wait() // wait until ffmpeg finish
check(err)
}
