package main import ( "fmt" "log" "sync" "time" "github.com/bwmarrin/discordgo" "layeh.com/gopus" "layeh.com/gumble/gumble" _ "layeh.com/gumble/opus" ) type fromDiscord struct { decoder *gopus.Decoder pcm chan []int16 streaming bool } var discordMutex sync.Mutex var discordMixerMutex sync.Mutex var fromDiscordMap = make(map[uint32]fromDiscord) // OnError gets called by dgvoice when an error is encountered. // By default logs to STDERR var OnError = func(str string, err error) { prefix := "dgVoice: " + str if err != nil { log.Println(prefix + ": " + err.Error()) } else { log.Println(prefix) } } // SendPCM will receive on the provied channel encode // received PCM data into Opus then send that to Discordgo func discordSendPCM(v *discordgo.VoiceConnection, pcm <-chan []int16, die chan bool) { const channels int = 1 const frameRate int = 48000 // audio sampling rate const frameSize int = 960 // uint16 size of each audio frame const maxBytes int = (frameSize * 2) * 2 // max size of opus data streaming := false opusEncoder, err := gopus.NewEncoder(frameRate, channels, gopus.Audio) if err != nil { OnError("NewEncoder Error", err) panic(err) } ticker := time.NewTicker(20 * time.Millisecond) lastReady := true var readyTimeout *time.Timer for { <-ticker.C if len(pcm) > 1 { if !streaming { v.Speaking(true) streaming = true } r1 := <-pcm r2 := <-pcm // try encoding pcm frame with Opus opus, err := opusEncoder.Encode(append(r1, r2...), frameSize, maxBytes) if err != nil { OnError("Encoding Error", err) continue } if v.Ready == false || v.OpusSend == nil { if lastReady == true { OnError(fmt.Sprintf("Discordgo not ready for opus packets. %+v : %+v", v.Ready, v.OpusSend), nil) readyTimeout = time.AfterFunc(30*time.Second, func() { die <- true }) lastReady = false } continue } else if lastReady == false { fmt.Println("Discordgo ready to send opus packets") lastReady = true readyTimeout.Stop() } v.OpusSend <- opus } else { if streaming { v.Speaking(false) streaming = false } } } } // ReceivePCM will receive on the the Discordgo OpusRecv channel and decode // the opus audio into PCM then send it on the provided channel. func discordReceivePCM(v *discordgo.VoiceConnection, die chan bool) { var err error lastReady := true var readyTimeout *time.Timer for { if v.Ready == false || v.OpusRecv == nil { if lastReady == true { OnError(fmt.Sprintf("Discordgo not to receive opus packets. %+v : %+v", v.Ready, v.OpusSend), nil) readyTimeout = time.AfterFunc(30*time.Second, func() { die <- true }) lastReady = false } continue } else if lastReady == false { fmt.Println("Discordgo ready to receive packets") lastReady = true readyTimeout.Stop() } p, ok := <-v.OpusRecv if !ok { log.Println("Opus not ok") continue } discordMutex.Lock() _, ok = fromDiscordMap[p.SSRC] discordMutex.Unlock() if !ok { newStream := fromDiscord{} newStream.pcm = make(chan []int16, 100) newStream.streaming = false newStream.decoder, err = gopus.NewDecoder(48000, 1) if err != nil { OnError("error creating opus decoder", err) continue } discordMutex.Lock() fromDiscordMap[p.SSRC] = newStream discordMutex.Unlock() } discordMutex.Lock() p.PCM, err = fromDiscordMap[p.SSRC].decoder.Decode(p.Opus, 960, false) discordMutex.Unlock() if err != nil { OnError("Error decoding opus data", err) continue } if len(p.PCM) != 960 { log.Println("Opus size error") continue } discordMutex.Lock() select { case fromDiscordMap[p.SSRC].pcm <- p.PCM[0:480]: default: log.Println("fromDiscordMap buffer full. Dropping packet") discordMutex.Unlock() continue } select { case fromDiscordMap[p.SSRC].pcm <- p.PCM[480:960]: default: log.Println("fromDiscordMap buffer full. Dropping packet") } discordMutex.Unlock() } } func fromDiscordMixer(toMumble chan<- gumble.AudioBuffer) { ticker := time.NewTicker(10 * time.Millisecond) sendAudio := false for { <-ticker.C discordMutex.Lock() sendAudio = false internalMixerArr := make([][]int16, 0) // Work through each channel for i := range fromDiscordMap { if len(fromDiscordMap[i].pcm) > 0 { sendAudio = true if fromDiscordMap[i].streaming == false { x := fromDiscordMap[i] x.streaming = true fromDiscordMap[i] = x } x1 := (<-fromDiscordMap[i].pcm) internalMixerArr = append(internalMixerArr, x1) } else { if fromDiscordMap[i].streaming == true { x := fromDiscordMap[i] x.streaming = false fromDiscordMap[i] = x } } } discordMutex.Unlock() outBuf := make([]int16, 480) for i := 0; i < len(outBuf); i++ { for j := 0; j < len(internalMixerArr); j++ { outBuf[i] += (internalMixerArr[j])[i] } } if sendAudio { select { case toMumble <- outBuf: default: log.Println("toMumble buffer full. Dropping packet") } } } }