112 lines
2.7 KiB
Go
112 lines
2.7 KiB
Go
// Package forwarding forwards incoming stream to other streaming services
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package forwarding
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import (
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"bufio"
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"log"
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"os/exec"
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"gitlab.crans.org/nounous/ghostream/messaging"
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)
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// Options to configure the stream forwarding.
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// For each stream name, user can provide several URL to forward stream to
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type Options map[string][]string
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// Serve handles incoming packets from SRT and forward them to other external services
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func Serve(streams *messaging.Streams, cfg Options) {
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if len(cfg) < 1 {
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// No forwarding, ignore
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return
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}
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// Subscribe to new stream event
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event := make(chan string, 8)
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streams.Subscribe(event)
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log.Printf("Stream forwarding initialized")
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// For each new stream
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for name := range event {
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streamCfg, ok := cfg[name]
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if !ok {
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// Not configured
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continue
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}
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// Get stream
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stream, err := streams.Get(name)
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if err != nil {
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log.Printf("Failed to get stream '%s'", name)
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}
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// Get specific quality
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// FIXME: make it possible to forward other qualities
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qualityName := "source"
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quality, err := stream.GetQuality(qualityName)
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if err != nil {
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log.Printf("Failed to get quality '%s'", qualityName)
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}
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// Start forwarding
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log.Printf("Starting forwarding for '%s' quality '%s'", name, qualityName)
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go forward(quality, streamCfg)
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}
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}
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// Start a FFMPEG instance and redirect stream output to forwarded streams
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func forward(q *messaging.Quality, fwdCfg []string) {
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output := make(chan []byte, 1024)
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q.Register(output)
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// Launch FFMPEG instance
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params := []string{"-hide_banner", "-loglevel", "error", "-re", "-i", "pipe:0"}
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for _, url := range fwdCfg {
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params = append(params, "-f", "flv", "-preset", "ultrafast", "-tune", "zerolatency",
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"-c", "copy", url)
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}
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ffmpeg := exec.Command("ffmpeg", params...)
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// Open pipes
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input, err := ffmpeg.StdinPipe()
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if err != nil {
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log.Printf("Error while opening forwarding ffmpeg input pipe: %s", err)
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return
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}
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errOutput, err := ffmpeg.StderrPipe()
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if err != nil {
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log.Printf("Error while opening forwarding ffmpeg output pipe: %s", err)
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return
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}
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// Start FFMpeg
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if err := ffmpeg.Start(); err != nil {
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log.Printf("Error while starting forwarding ffmpeg instance: %s", err)
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}
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// Kill FFMPEG when stream is ended
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defer func() {
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_ = input.Close()
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_ = errOutput.Close()
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_ = ffmpeg.Process.Kill()
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q.Unregister(output)
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}()
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// Log standard error output
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go func() {
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scanner := bufio.NewScanner(errOutput)
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for scanner.Scan() {
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log.Printf("[FORWARDING FFMPEG] %s", scanner.Text())
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}
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}()
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// Read stream output and redirect immediately to ffmpeg
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for data := range output {
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_, err := input.Write(data)
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if err != nil {
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log.Printf("Error while writing to forwarded stream: %s", err)
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break
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}
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}
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}
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