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ghostream/stream/multicast/muticast.go

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package multicast
import (
"bufio"
"io"
"log"
"os/exec"
)
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// Options to configure the multicast:
//for each stream key, we can have several additional stream URL where the main stream is redirected to
type Options struct {
Outputs map[string][]string
}
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var (
options Options
ffmpegInstances = make(map[string]*exec.Cmd)
ffmpegInputStreams = make(map[string]*io.WriteCloser)
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)
// New Load configuration
func New(cfg *Options) error {
options = *cfg
return nil
}
// RegisterStream Declare a new open stream and create ffmpeg instances
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func RegisterStream(streamKey string) {
if len(options.Outputs[streamKey]) == 0 {
return
}
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params := []string{"-re", "-i", "pipe:0"}
for _, stream := range options.Outputs[streamKey] {
params = append(params, "-f", "flv", "-preset", "ultrafast", "-tune", "zerolatency",
"-c", "copy", stream)
}
// Launch FFMPEG instance
ffmpeg := exec.Command("ffmpeg", params...)
// Open pipes
input, err := ffmpeg.StdinPipe()
if err != nil {
panic(err)
}
output, err := ffmpeg.StdoutPipe()
if err != nil {
panic(err)
}
errOutput, err := ffmpeg.StderrPipe()
if err != nil {
panic(err)
}
ffmpegInstances[streamKey] = ffmpeg
ffmpegInputStreams[streamKey] = &input
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if err := ffmpeg.Start(); err != nil {
panic(err)
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}
// Log ffmpeg output
go func() {
scanner := bufio.NewScanner(output)
for scanner.Scan() {
log.Println("[FFMPEG " + streamKey + "] " + scanner.Text())
}
}()
// Log also error output
go func() {
scanner := bufio.NewScanner(errOutput)
for scanner.Scan() {
log.Println("[FFMPEG ERROR " + streamKey + "] " + scanner.Text())
}
}()
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}
// SendPacket When a SRT packet is received, transmit it to all FFMPEG instances related to the stream key
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func SendPacket(streamKey string, data []byte) {
stdin := ffmpegInputStreams[streamKey]
_, err := (*stdin).Write(data)
if err != nil {
log.Println("Error while sending a packet to external streaming server for key "+streamKey, err)
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}
}
// CloseConnection When the stream is ended, close FFMPEG instances
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func CloseConnection(streamKey string) {
ffmpeg := ffmpegInstances[streamKey]
if err := ffmpeg.Process.Kill(); err != nil {
panic(err)
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}
delete(ffmpegInstances, streamKey)
delete(ffmpegInputStreams, streamKey)
}