135 lines
3.0 KiB
Go
135 lines
3.0 KiB
Go
package forwarding
|
|
|
|
import (
|
|
"bufio"
|
|
"gitlab.crans.org/nounous/ghostream/stream/srt"
|
|
"io"
|
|
"log"
|
|
"os/exec"
|
|
)
|
|
|
|
// Options to configure the stream forwarding.
|
|
// For each stream name, user can provide several URL to forward stream to
|
|
type Options map[string][]string
|
|
|
|
var (
|
|
cfg Options
|
|
forwardingChannel chan srt.Packet
|
|
ffmpegInstances = make(map[string]*exec.Cmd)
|
|
ffmpegInputStreams = make(map[string]*io.WriteCloser)
|
|
)
|
|
|
|
// Serve Load configuration and initialize SRT channel
|
|
func Serve(c Options, channel chan srt.Packet) {
|
|
cfg = c
|
|
forwardingChannel = channel
|
|
log.Printf("Stream forwarding initialized")
|
|
waitForPackets()
|
|
}
|
|
|
|
func waitForPackets() {
|
|
for {
|
|
var err error = nil
|
|
packet := <-forwardingChannel
|
|
switch packet.PacketType {
|
|
case "register":
|
|
err = RegisterStream(packet.StreamName)
|
|
break
|
|
case "sendData":
|
|
err = SendPacket(packet.StreamName, packet.Data)
|
|
break
|
|
case "close":
|
|
err = CloseConnection(packet.StreamName)
|
|
break
|
|
default:
|
|
log.Println("Unknown SRT packet type:", packet.PacketType)
|
|
break
|
|
}
|
|
if err != nil {
|
|
log.Printf("Error occured while receiving SRT packet of type %s: %s", packet.PacketType, err)
|
|
}
|
|
}
|
|
}
|
|
|
|
// RegisterStream Declare a new open stream and create ffmpeg instances
|
|
func RegisterStream(name string) error {
|
|
streams, exist := cfg[name]
|
|
if !exist || len(streams) == 0 {
|
|
// Nothing to do, not configured
|
|
return nil
|
|
}
|
|
|
|
// Launch FFMPEG instance
|
|
params := []string{"-re", "-i", "pipe:0"}
|
|
for _, stream := range streams {
|
|
params = append(params, "-f", "flv", "-preset", "ultrafast", "-tune", "zerolatency",
|
|
"-c", "copy", stream)
|
|
}
|
|
ffmpeg := exec.Command("ffmpeg", params...)
|
|
|
|
// Open pipes
|
|
input, err := ffmpeg.StdinPipe()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
output, err := ffmpeg.StdoutPipe()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
errOutput, err := ffmpeg.StderrPipe()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
ffmpegInstances[name] = ffmpeg
|
|
ffmpegInputStreams[name] = &input
|
|
|
|
// Start FFMpeg
|
|
if err := ffmpeg.Start(); err != nil {
|
|
return err
|
|
}
|
|
|
|
// Log ffmpeg output
|
|
go func() {
|
|
scanner := bufio.NewScanner(output)
|
|
for scanner.Scan() {
|
|
log.Printf("[FFMPEG %s] %s", name, scanner.Text())
|
|
}
|
|
}()
|
|
|
|
// Log also error output
|
|
go func() {
|
|
scanner := bufio.NewScanner(errOutput)
|
|
for scanner.Scan() {
|
|
log.Printf("[FFMPEG ERR %s] %s", name, scanner.Text())
|
|
}
|
|
}()
|
|
|
|
return nil
|
|
}
|
|
|
|
// SendPacket forward data to all FFMpeg instances related to the stream name
|
|
func SendPacket(name string, data []byte) error {
|
|
stdin := ffmpegInputStreams[name]
|
|
if stdin == nil {
|
|
// Don't need to forward stream
|
|
return nil
|
|
}
|
|
_, err := (*stdin).Write(data)
|
|
return err
|
|
}
|
|
|
|
// CloseConnection When the stream is ended, close FFMPEG instances
|
|
func CloseConnection(name string) error {
|
|
ffmpeg := ffmpegInstances[name]
|
|
if ffmpeg == nil {
|
|
// No stream to close
|
|
return nil
|
|
}
|
|
if err := ffmpeg.Process.Kill(); err != nil {
|
|
return err
|
|
}
|
|
delete(ffmpegInstances, name)
|
|
delete(ffmpegInputStreams, name)
|
|
return nil
|
|
}
|