stryan/mumble-discord-bridge
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to mumble jitter buffer and silence

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This commit is contained in:
Tyler Stiene 2021-04-19 23:25:45 -04:00
parent c7f79ba01d
commit a1f6a60b89
5 changed files with 101 additions and 40 deletions
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2
Makefile
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@ -1,4 +1,4 @@
GOFILES=main.go mumble.go discord.go bridge.go config.go mumble-handlers.go discord-handlers.go tickerct.go
GOFILES=main.go mumble.go discord.go bridge.go config.go mumble-handlers.go discord-handlers.go sleepct.go
mumble-discord-bridge: $(GOFILES)
goreleaser build --skip-validate --rm-dist

65
README.md
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@ -13,41 +13,43 @@ The binary will also attempt to load .env file located in the working directory.
```bash
Usage of ./mumble-discord-bridge:
-cpuprofile file
write cpu profile to file
write cpu profile to file
-debug-level int
DEBUG_LEVEL, Discord debug level, optional, (default 1) (default 1)
DEBUG_LEVEL, Discord debug level, optional, (default 1) (default 1)
-discord-cid string
DISCORD_CID, discord cid, required
DISCORD_CID, discord cid, required
-discord-command string
DISCORD_COMMAND, Discord command string, env alt DISCORD_COMMAND, optional, (defaults mumble-discord) (default "mumble-discord")
DISCORD_COMMAND, Discord command string, env alt DISCORD_COMMAND, optional, (defaults mumble-discord) (default "mumble-discord")
-discord-disable-text
DISCORD_DISABLE_TEXT, disable sending direct messages to discord, (default false)
DISCORD_DISABLE_TEXT, disable sending direct messages to discord, (default false)
-discord-gid string
DISCORD_GID, discord gid, required
DISCORD_GID, discord gid, required
-discord-token string
DISCORD_TOKEN, discord bot token, required
DISCORD_TOKEN, discord bot token, required
-mode string
MODE, [constant, manual, auto] determine which mode the bridge starts in, (default constant) (default "constant")
MODE, [constant, manual, auto] determine which mode the bridge starts in, (default constant) (default "constant")
-mumble-address string
MUMBLE_ADDRESS, mumble server address, example example.com, required
MUMBLE_ADDRESS, mumble server address, example example.com, required
-mumble-certificate string
MUMBLE_CERTIFICATE, client certificate to use when connecting to the Mumble server
MUMBLE_CERTIFICATE, client certificate to use when connecting to the Mumble server
-mumble-channel string
MUMBLE_CHANNEL, mumble channel to start in, using '/' to separate nested channels, optional
MUMBLE_CHANNEL, mumble channel to start in, using '/' to separate nested channels, optional
-mumble-disable-text
MUMBLE_DISABLE_TEXT, disable sending text to mumble, (default false)
MUMBLE_DISABLE_TEXT, disable sending text to mumble, (default false)
-mumble-insecure
MUMBLE_INSECURE, mumble insecure, optional
MUMBLE_INSECURE, mumble insecure, optional
-mumble-password string
MUMBLE_PASSWORD, mumble password, optional
MUMBLE_PASSWORD, mumble password, optional
-mumble-port int
MUMBLE_PORT, mumble port, (default 64738) (default 64738)
MUMBLE_PORT, mumble port, (default 64738) (default 64738)
-mumble-username string
MUMBLE_USERNAME, mumble username, (default: discord) (default "Discord")
MUMBLE_USERNAME, mumble username, (default: discord) (default "Discord")
-nice
NICE, whether the bridge should automatically try to 'nice' itself, (default false)
NICE, whether the bridge should automatically try to 'nice' itself, (default false)
-to-discord-buffer int
TO_DISCORD_BUFFER, Delay buffer from Mumble to Discord to absorb timing issues related to network and hardware quality. (Increments of 10ms) (default 50)
TO_DISCORD_BUFFER, Jitter buffer from Mumble to Discord to absorb timing issues related to network, OS and hardware quality. (Increments of 10ms) (default 50)
-to-mumble-buffer int
TO_MUMBLE_BUFFER, Jitter buffer from Discord to Mumble to absorb timing issues related to network, OS and hardware quality. (Increments of 10ms) (default 50)
```
The bridge can be run with the follow modes:
@ -66,14 +68,18 @@ In "auto" or "manual" modes, the bridge can be controlled in Discord with the fo
```bash
!DISCORD_COMMAND link
Commands the bridge to join the Discord channel the user is in and the Mumble server
Commands the bridge to join the Discord channel the user is in and the Mumble server
!DISCORD_COMMAND unlink
Commands the bridge to leave the Discord channel the user is in and the Mumble server
Commands the bridge to leave the Discord channel the user is in and the Mumble server
!DISCORD_COMMAND refresh
Commands the bridge to unlink, then link again.
Commands the bridge to unlink, then link again.
!DISCORD_COMMAND auto
Toggle between manual and auto mode
Toggle between manual and auto mode
```
## Setup
### Creating a Discord Bot
@ -85,6 +91,7 @@ The guide below provides information on how to setup a Discord bot.
Individual Discord servers need to invite the bot before it can connect.
The bot requires the following permissions:
* View Channels
* See Messages
* Read Message History
@ -165,6 +172,16 @@ go build -o mumble-discord-bridge *.go
make mumble-discord-bridge
```
## Jitter Buffer
The bridge implements simple jitter buffers that attempt to compensate for network, OS and hardware related jitter.
These jitter buffers are configurable in both directions.
A jitter buffer will slightly the delay the transmission of audio in order to have audio packets buffered for the next time step.
The Mumble client itself includes a jitter buffer for similar reasons.
A default jitter of 50ms should be adequate for most scenarios.
A warning will be logged if short burst or audio are seen.
A single warning can be ignored multiple warnings in short time spans would suggest the need for a larger jitter buffer.
## Known Issues
Currently there is an issue opening the discord voice channel.
@ -187,5 +204,5 @@ Please consider opening an issue to discuss features and ideas.
The project would not have been possible without:
- [gumble](https://github.com/layeh/gumble)
- [discordgo](https://github.com/bwmarrin/discordgo)
* [gumble](https://github.com/layeh/gumble)
* [discordgo](https://github.com/bwmarrin/discordgo)

1
config.go
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@ -26,6 +26,7 @@ type BridgeConfig struct {
MumbleInsecure bool
MumbleCertificate string
MumbleChannel []string
mumbleStartStreamCount int
MumbleDisableText bool
Command string
GID string

60
discord.go
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@ -102,7 +102,6 @@ func (dd *DiscordDuplex) discordSendPCM(ctx context.Context, wg *sync.WaitGroup,
default:
}
// <-ticker.C
sleepTick.SleepNextTarget()
if (len(pcm) > 1 && streaming) || (len(pcm) > dd.Bridge.BridgeConfig.DiscordStartStreamingCount && !streaming) {
@ -132,14 +131,13 @@ func (dd *DiscordDuplex) discordSendPCM(ctx context.Context, wg *sync.WaitGroup,
// The problem delays result in choppy or stuttering sounds, especially when the silence frames are introduced into the opus frames below.
// Multiple short cycle delays can result in a Discrod rate limiter being trigger due to of multiple JSON speaking/not-speaking state changes
if time.Since(speakingStart).Milliseconds() < 100 {
log.Println("Warning: Short Mumble to Discord speaking cycle. Consider increaseing the size of the TO_DISCORD_BUFFER")
log.Println("Warning: Short Mumble to Discord speaking cycle. Consider increaseing the size of the to Discord jitter buffer.")
}
// Send silence as suggested by Discord Documentation.
// We want to do this after alerting the user of possible short speaking cycles
for i := 0; i < 5; i++ {
internalSend(opusSilence)
// <-ticker.C
sleepTick.SleepNextTarget()
}
@ -241,11 +239,17 @@ func (dd *DiscordDuplex) discordReceivePCM(ctx context.Context, wg *sync.WaitGro
}
func (dd *DiscordDuplex) fromDiscordMixer(ctx context.Context, wg *sync.WaitGroup, toMumble chan<- gumble.AudioBuffer) {
mumbleSilence := gumble.AudioBuffer{}
for i := 3; i < 480; i++ {
mumbleSilence = append(mumbleSilence, 0x00)
}
var speakingStart time.Time
sleepTick := SleepCT{
d: 10 * time.Millisecond,
t: time.Now(),
}
sendAudio := false
toMumbleStreaming := false
wg.Add(1)
for {
@ -265,9 +269,16 @@ func (dd *DiscordDuplex) fromDiscordMixer(ctx context.Context, wg *sync.WaitGrou
// Work through each channel
for i := range dd.fromDiscordMap {
if len(dd.fromDiscordMap[i].pcm) > 0 {
bufferLength := len(dd.fromDiscordMap[i].pcm)
isStreaming := dd.fromDiscordMap[i].streaming
if (bufferLength > 0 && isStreaming) || (bufferLength > dd.Bridge.BridgeConfig.mumbleStartStreamCount && !isStreaming) {
if !toMumbleStreaming {
speakingStart = time.Now()
toMumbleStreaming = true
}
sendAudio = true
if !dd.fromDiscordMap[i].streaming {
if !isStreaming {
x := dd.fromDiscordMap[i]
x.streaming = true
dd.fromDiscordMap[i] = x
@ -286,21 +297,44 @@ func (dd *DiscordDuplex) fromDiscordMixer(ctx context.Context, wg *sync.WaitGrou
dd.discordMutex.Unlock()
outBuf := make([]int16, 480)
mumbleTimeoutSend := func(outBuf []int16) {
timeout := make(chan bool, 1)
go func() {
time.Sleep(10 * time.Millisecond)
timeout <- true
}()
for i := 0; i < len(outBuf); i++ {
for j := 0; j < len(internalMixerArr); j++ {
outBuf[i] += (internalMixerArr[j])[i]
select {
case toMumble <- outBuf:
case <-timeout:
log.Println("toMumble timeout. Dropping packet")
}
}
if sendAudio {
select {
case toMumble <- outBuf:
default:
log.Println("toMumble buffer full. Dropping packet")
// Regular send mixed audio
outBuf := make([]int16, 480)
for i := 0; i < len(outBuf); i++ {
for j := 0; j < len(internalMixerArr); j++ {
outBuf[i] += (internalMixerArr[j])[i]
}
}
mumbleTimeoutSend(outBuf)
} else if !sendAudio && toMumbleStreaming {
// Send opus silence to mumble
// See note above about jitter buffer warning
if time.Since(speakingStart).Milliseconds() < 100 {
log.Println("Warning: Short Discord to Mumble speaking cycle. Consider increaseing the size of the to Mumble jitter buffer.")
}
for i := 0; i < 5; i++ {
mumbleTimeoutSend(mumbleSilence)
sleepTick.SleepNextTarget()
}
toMumbleStreaming = false
}
}
}

13
main.go
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@ -42,11 +42,12 @@ func main() {
mumbleInsecure := flag.Bool("mumble-insecure", lookupEnvOrBool("MUMBLE_INSECURE", false), " MUMBLE_INSECURE, mumble insecure, optional")
mumbleCertificate := flag.String("mumble-certificate", lookupEnvOrString("MUMBLE_CERTIFICATE", ""), "MUMBLE_CERTIFICATE, client certificate to use when connecting to the Mumble server")
mumbleChannel := flag.String("mumble-channel", lookupEnvOrString("MUMBLE_CHANNEL", ""), "MUMBLE_CHANNEL, mumble channel to start in, using '/' to separate nested channels, optional")
mumbleSendBuffer := flag.Int("to-mumble-buffer", lookupEnvOrInt("TO_MUMBLE_BUFFER", 50), "TO_MUMBLE_BUFFER, Jitter buffer from Discord to Mumble to absorb timing issues related to network, OS and hardware quality. (Increments of 10ms)")
mumbleDisableText := flag.Bool("mumble-disable-text", lookupEnvOrBool("MUMBLE_DISABLE_TEXT", false), "MUMBLE_DISABLE_TEXT, disable sending text to mumble, (default false)")
discordToken := flag.String("discord-token", lookupEnvOrString("DISCORD_TOKEN", ""), "DISCORD_TOKEN, discord bot token, required")
discordGID := flag.String("discord-gid", lookupEnvOrString("DISCORD_GID", ""), "DISCORD_GID, discord gid, required")
discordCID := flag.String("discord-cid", lookupEnvOrString("DISCORD_CID", ""), "DISCORD_CID, discord cid, required")
discordSendBuffer := flag.Int("to-discord-buffer", lookupEnvOrInt("TO_DISCORD_BUFFER", 50), "TO_DISCORD_BUFFER, Delay buffer from Mumble to Discord to absorb timing issues related to network and hardware quality. (Increments of 10ms)")
discordSendBuffer := flag.Int("to-discord-buffer", lookupEnvOrInt("TO_DISCORD_BUFFER", 50), "TO_DISCORD_BUFFER, Jitter buffer from Mumble to Discord to absorb timing issues related to network, OS and hardware quality. (Increments of 10ms)")
discordCommand := flag.String("discord-command", lookupEnvOrString("DISCORD_COMMAND", "mumble-discord"), "DISCORD_COMMAND, Discord command string, env alt DISCORD_COMMAND, optional, (defaults mumble-discord)")
discordDisableText := flag.Bool("discord-disable-text", lookupEnvOrBool("DISCORD_DISABLE_TEXT", false), "DISCORD_DISABLE_TEXT, disable sending direct messages to discord, (default false)")
mode := flag.String("mode", lookupEnvOrString("MODE", "constant"), "MODE, [constant, manual, auto] determine which mode the bridge starts in, (default constant)")
@ -102,8 +103,15 @@ func main() {
*discordSendBuffer = 10
}
if *mumbleSendBuffer < 10 {
*mumbleSendBuffer = 10
}
var discordStartStreamingCount int = int(math.Round(float64(*discordSendBuffer) / 10.0))
log.Println("Discord Streaming Buffer: ", discordStartStreamingCount*10, " ms")
log.Println("To Discord Jitter Buffer: ", discordStartStreamingCount*10, " ms")
var mumbleStartStreamCount int = int(math.Round(float64(*mumbleSendBuffer) / 10.0))
log.Println("To Mumble Jitter Buffer: ", mumbleStartStreamCount*10, " ms")
// BRIDGE SETUP
@ -114,6 +122,7 @@ func main() {
MumbleInsecure: *mumbleInsecure,
MumbleCertificate: *mumbleCertificate,
MumbleChannel: strings.Split(*mumbleChannel, "/"),
mumbleStartStreamCount: mumbleStartStreamCount,
MumbleDisableText: *mumbleDisableText,
Command: *discordCommand,
GID: *discordGID,