Merge latest Barnard fork improvements

Merge the newest logging, jitter recovery, AGC hotkey, and channel tree refresh work from bmmcginty/barnard-stormdragon-ai-fork dev.

Co-authored-by: Brandon McGinty <git@bmcginty.us>

Co-authored-by: Tyler Spivey <tspivey@pcdesk.net>

README.md

@@ -40,6 +40,20 @@ noisesuppressionenabled = true
 
 RNNoise is a required build and runtime dependency.
 
+## Automatic Gain Control
+
+Barnard normalizes the level of your outgoing microphone audio with automatic gain control (AGC), which boosts quiet speech and compresses loud peaks. AGC is enabled by default.
+
+### Controls
+- **F12 key**: Toggle AGC on/off (configurable hotkey)
+- **FIFO command**: Send `agc` command to toggle during runtime
+- **Configuration**: Set `agcenabled` in `~/.barnard.toml`
+
+### Configuration Example
+```toml
+agcenabled = true
+```
+
 ## FIFO Control
 
 If you pass the --fifo option to Barnard, a FIFO pipe will be created.
@@ -54,6 +68,7 @@ Current Commands:
 * toggle: Toggle your transmission state.
 * talk: Synonym for toggle.
 * noise: Toggle noise suppression on/off for microphone input.
+* agc: Toggle automatic gain control on/off for microphone input.
 * record: Toggle recording. You may also use `record start` or `record stop`.
 * exit: Exit Barnard, just like when you press your quit key.
 
@@ -140,6 +155,35 @@ If you modify the config file while Barnard is running, your changes may be over
 You can set username and defaultserver in your config file, and they will be used if none is specified when launching barnard.
 (Note that the default username (an empty string) and the default server name (localhost:64738) have been the defaults for barnard up to this  point, and have been left that way for compatibility.)
 
+## Audio Packet Duration
+
+Barnard sends 10 ms audio packets by default. On a slow or unstable connection,
+using larger packets can reduce packet overhead and make short dropouts less
+noticeable, at the cost of additional voice latency. Start Barnard with one of
+the supported durations:
+
+```sh
+barnard --audio-interval 20
+```
+
+Supported values are `10`, `20`, `40`, and `60` milliseconds. Try `20` ms
+first; use `40` ms only if the connection remains unreliable.
+
+## Incoming Audio Jitter Buffer
+
+Barnard holds 40 ms of audio separately for each speaker before starting
+playback. This prevents brief delayed UDP packets from draining OpenAL's audio
+queue, which otherwise produces clicks or pops. To adjust this tradeoff between
+resilience and added incoming latency:
+
+```sh
+barnard --jitter-buffer 60
+```
+
+Supported values are `0`, `20`, `40` (default), and `60` milliseconds. Try
+`60` ms for a lossy or jittery connection. Use `0` only when minimizing latency
+is more important than avoiding playback underruns.
+
 ## Audio Devices
 
 You can set the default input and output devices in the config file as well.
@@ -249,6 +293,7 @@ After running the command above, `barnard` will be compiled as `$(go env GOPATH)
 
 - <kbd>F1</kbd>: toggle voice transmission
 - <kbd>F9</kbd>: toggle noise suppression
+- <kbd>F12</kbd>: toggle automatic gain control
 - <kbd>F11</kbd>: open actions menu for the focused tree item
 - <kbd>Ctrl+R</kbd>: toggle recording
 - <kbd>Ctrl+L</kbd>: clear chat log

audio/agc.go

@@ -2,41 +2,43 @@ package audio
 
 import (
 	"math"
+	"sync/atomic"
 )
 
 // AGC (Automatic Gain Control) processor for voice normalization
 type AGC struct {
-	targetLevel    float32 // Target RMS level (0.0-1.0)
-	maxGain        float32 // Maximum gain multiplier
-	minGain        float32 // Minimum gain multiplier
-	attackTime     float32 // Attack time coefficient
-	releaseTime    float32 // Release time coefficient
-	currentGain    float32 // Current gain value
-	envelope       float32 // Signal envelope
-	enabled        bool    // Whether AGC is enabled
-	compThreshold  float32 // Compression threshold
-	compRatio      float32 // Compression ratio
+	targetLevel   float32     // Target RMS level (0.0-1.0)
+	maxGain       float32     // Maximum gain multiplier
+	minGain       float32     // Minimum gain multiplier
+	attackTime    float32     // Attack time coefficient
+	releaseTime   float32     // Release time coefficient
+	currentGain   float32     // Current gain value
+	envelope      float32     // Signal envelope
+	enabled       atomic.Bool // Whether AGC is enabled; toggled outside the capture goroutine
+	compThreshold float32     // Compression threshold
+	compRatio     float32     // Compression ratio
 }
 
 // NewAGC creates a new AGC processor with sensible defaults for voice
 func NewAGC() *AGC {
-	return &AGC{
-		targetLevel:    0.12,  // Target 12% of max amplitude (conservative level)
-		maxGain:        4.0,   // Maximum 4x gain (about 12dB)
-		minGain:        0.25,  // Minimum 0.25x gain (-12dB)
-		attackTime:     0.008, // Fast attack (8ms)
-		releaseTime:    0.15,  // Slower release (150ms)
-		currentGain:    1.0,   // Start with unity gain
-		envelope:       0.0,   // Start with zero envelope
-		enabled:        true,  // Enable by default
-		compThreshold:  0.85,  // Compress signals above 85%
-		compRatio:      2.0,   // 2:1 compression ratio (gentler)
+	agc := &AGC{
+		targetLevel:   0.12,  // Target 12% of max amplitude (conservative level)
+		maxGain:       4.0,   // Maximum 4x gain (about 12dB)
+		minGain:       0.25,  // Minimum 0.25x gain (-12dB)
+		attackTime:    0.008, // Fast attack (8ms)
+		releaseTime:   0.15,  // Slower release (150ms)
+		currentGain:   1.0,   // Start with unity gain
+		envelope:      0.0,   // Start with zero envelope
+		compThreshold: 0.85,  // Compress signals above 85%
+		compRatio:     2.0,   // 2:1 compression ratio (gentler)
 	}
+	agc.enabled.Store(true) // Enable by default
+	return agc
 }
 
 // ProcessSamples applies AGC processing to audio samples
 func (agc *AGC) ProcessSamples(samples []int16) {
-	if !agc.enabled || len(samples) == 0 {
+	if !agc.enabled.Load() || len(samples) == 0 {
 		return
 	}
 
@@ -125,12 +127,12 @@ func (agc *AGC) ProcessSamples(samples []int16) {
 
 // SetEnabled enables or disables AGC processing
 func (agc *AGC) SetEnabled(enabled bool) {
-	agc.enabled = enabled
+	agc.enabled.Store(enabled)
 }
 
 // IsEnabled returns whether AGC is enabled
 func (agc *AGC) IsEnabled() bool {
-	return agc.enabled
+	return agc.enabled.Load()
 }
 
 // SetTargetLevel sets the target RMS level (0.0-1.0)

barnard-ui

@@ -38,6 +38,10 @@ configDir="$HOME/.config/barnard"
 serverFile="$configDir/servers.conf"
 certFile="$configDir/barnard.pem"
 logFile="$cacheDir/${0##*/}.log"
+logDir="$HOME/barnard-logs"
+logPrefsFile="$configDir/logging.conf"
+sessionLogFile=""
+saveSessionLogs=0
 
 if ! mkdir -p "$cacheDir" "$configDir"; then
     printf 'Could not create Barnard configuration directories.\n' >&2
@@ -64,6 +68,9 @@ log() {
     local line
     while IFS= read -r line ; do
         printf '%s\n' "$line" >> "$logFile"
+        if [[ -n "$sessionLogFile" ]]; then
+            printf '%s\n' "$line" >> "$sessionLogFile"
+        fi
     done
 }
 
@@ -141,6 +148,12 @@ trim() {
     printf '%s' "$value"
 }
 
+sanitize_filename() {
+    local value="$1"
+    value="${value//[^[:alnum:]_.-]/_}"
+    printf '%s' "$value"
+}
+
 field_is_valid() {
     local value="$1"
     [[ "$value" != *$'\n'* && "$value" != *$'\r'* ]]
@@ -376,6 +389,145 @@ config_has_nonempty_value() {
     return 1
 }
 
+load_logging_pref() {
+    local line
+    local key
+    local value
+    saveSessionLogs=0
+
+    [[ -r "$logPrefsFile" ]] || return 0
+    while IFS= read -r line || [[ -n "$line" ]]; do
+        line="$(trim "$line")"
+        [[ -z "$line" || "$line" == \#* || "$line" != *=* ]] && continue
+        key="${line%%=*}"
+        key="$(trim "$key")"
+        key="${key,,}"
+        value="${line#*=}"
+        value="$(trim "$value")"
+        case "$key" in
+            savesessionlogs)
+                if [[ "$value" == "1" || "$value" == "true" || "$value" == "yes" ]]; then
+                    saveSessionLogs=1
+                fi
+                ;;
+        esac
+    done < "$logPrefsFile"
+}
+
+save_logging_pref() {
+    local tmpFile="$logPrefsFile.tmp"
+    if ! printf 'saveSessionLogs=%s\n' "$saveSessionLogs" > "$tmpFile"; then
+        rm -f "$tmpFile"
+        msgbox "$(gettext "Could not save logging preference.")"
+        return 1
+    fi
+    chmod 600 "$tmpFile" 2> /dev/null || true
+    if ! mv "$tmpFile" "$logPrefsFile"; then
+        rm -f "$tmpFile"
+        msgbox "$(gettext "Could not save logging preference.")"
+        return 1
+    fi
+}
+
+toggle-session-logging() {
+    local question
+    if (( saveSessionLogs )); then
+        question="$(gettext "Session logging is currently enabled. Disable it?")"
+    else
+        question="$(gettext "Session logging is currently disabled. Enable saving logs to the logs directory?")"
+    fi
+    if [[ "$(yesno "$question")" == "Yes" ]]; then
+        if (( saveSessionLogs )); then
+            saveSessionLogs=0
+        else
+            saveSessionLogs=1
+        fi
+        save_logging_pref
+    fi
+}
+
+send-logs() {
+    local bundle
+    local outputFile
+    local code
+    local wormholePid
+    local status
+    local i
+    local detail
+
+    if ! command -v wormhole > /dev/null 2>&1; then
+        msgbox "$(gettext "Required command not found:") wormhole"
+        return
+    fi
+    if ! command -v tar > /dev/null 2>&1; then
+        msgbox "$(gettext "Required command not found:") tar"
+        return
+    fi
+    if [[ ! -d "$logDir" ]] || ! compgen -G "$logDir"/*.log > /dev/null 2>&1; then
+        msgbox "$(gettext "No logs to send. Logs are saved to:") $logDir"
+        return
+    fi
+
+    bundle="$cacheDir/barnard-logs-$(date +%Y%m%d-%H%M%S).tar.gz"
+    if ! tar -czf "$bundle" -C "$logDir" . 2> /dev/null; then
+        msgbox "$(gettext "Could not create log archive.")"
+        return
+    fi
+
+    outputFile="$cacheDir/wormhole-$$.txt"
+    wormhole send "$bundle" > "$outputFile" 2>&1 &
+    wormholePid=$!
+
+    code=""
+    for (( i = 0; i < 40; i++ )); do
+        sleep 0.25
+        code="$(grep -Eo '[0-9]+-[a-z]+-[a-z]+' "$outputFile" 2> /dev/null | head -n1)"
+        [[ -n "$code" ]] && break
+        kill -0 "$wormholePid" 2> /dev/null || break
+    done
+
+    if [[ -n "$code" ]]; then
+        msgbox "$(gettext "Wormhole code:") $code"
+        wait "$wormholePid"
+        status=$?
+        if (( status == 0 )); then
+            msgbox "$(gettext "Logs sent successfully.")"
+        else
+            msgbox "$(gettext "Log transfer did not complete successfully.")"
+        fi
+    else
+        kill "$wormholePid" 2> /dev/null || true
+        wait "$wormholePid" 2> /dev/null || true
+        detail="$(tail -n 3 "$outputFile" 2> /dev/null)"
+        if [[ -n "$detail" ]]; then
+            msgbox "$(gettext "Could not start wormhole transfer:") $detail"
+        else
+            msgbox "$(gettext "Could not start wormhole transfer.")"
+        fi
+    fi
+
+    rm -f "$outputFile" "$bundle"
+}
+
+manage-logs() {
+    local action
+    local loggingAction
+
+    while : ; do
+        if (( saveSessionLogs )); then
+            loggingAction="$(gettext "Disable logs")"
+        else
+            loggingAction="$(gettext "Enable logs")"
+        fi
+        action="$(menulist "$loggingAction" "$(gettext "Send logs with wormhole")" "$(gettext "Go Back")")" || return
+        case "$action" in
+            "$loggingAction") toggle-session-logging ;;
+            "$(gettext "Send logs with wormhole")") send-logs ;;
+            "$(gettext "Go Back")"|"") return ;;
+        esac
+    done
+}
+
 add-server() {
     local serverName
     local serverAddress
@@ -424,6 +576,7 @@ add-server() {
 connect() {
     local serverName
     local barnardStatus
+    local safeServerName
     local -a names=()
     local -a barnardArgs=()
 
@@ -440,6 +593,20 @@ connect() {
 
     require_command barnard barnard
 
+    sessionLogFile=""
+    if (( saveSessionLogs )); then
+        safeServerName="$(sanitize_filename "$serverName")"
+        if ! mkdir -p "$logDir"; then
+            msgbox "$(gettext "Could not create logs directory:") $logDir"
+        else
+            sessionLogFile="$logDir/${safeServerName}-$(date +%F).log"
+            if ! : >> "$sessionLogFile"; then
+                msgbox "$(gettext "Could not write log file:") $sessionLogFile"
+                sessionLogFile=""
+            fi
+        fi
+    fi
+
     barnardArgs=(-server "${serverAddresses[$serverName]}:${serverPorts[$serverName]}")
     if [[ -n "${serverPasswords[$serverName]}" ]]; then
         barnardArgs+=(-password "${serverPasswords[$serverName]}")
@@ -453,9 +620,13 @@ connect() {
     if [[ -f "$certFile" ]] && ! config_has_nonempty_value certificate; then
         barnardArgs+=(-certificate "$certFile")
     fi
+    if [[ -n "$sessionLogFile" ]]; then
+        barnardArgs+=(-log debug -logfile "$sessionLogFile")
+    fi
 
     command barnard "${barnardArgs[@]}" --fifo "$configDir/cmd" --buffers 16 |& log
     barnardStatus=${PIPESTATUS[0]}
+    sessionLogFile=""
     if (( barnardStatus != 0 )); then
         msgbox "$(gettext "Barnard exited with status") $barnardStatus. $(gettext "See log:") $logFile"
     fi
@@ -581,14 +752,16 @@ main() {
 
     require_command dialog dialog
     load_servers
+    load_logging_pref
 
     while : ; do
-        action="$(menulist "$(gettext "Connect")" "$(gettext "Add server")" "$(gettext "Remove server")" "$(gettext "Manage Certificate")" "$(gettext "Exit")")" || exit 0
+        action="$(menulist "$(gettext "Connect")" "$(gettext "Add server")" "$(gettext "Remove server")" "$(gettext "Manage Certificate")" "$(gettext "Logs")" "$(gettext "Exit")")" || exit 0
         case "$action" in
             "$(gettext "Connect")") connect ;;
             "$(gettext "Add server")") add-server ;;
             "$(gettext "Remove server")") remove-server ;;
             "$(gettext "Manage Certificate")") manage-certificate ;;
+            "$(gettext "Logs")") manage-logs ;;
             "$(gettext "Exit")"|"") exit 0 ;;
         esac
     done

client.go

@@ -90,6 +90,7 @@ func (b *Barnard) connect(reconnect bool) bool {
 	stream.SetMicVolume(b.UserConfig.GetMicVolume(), false)
 	stream.AttachStream(b.Client)
 	stream.SetNoiseProcessor(b.NoiseSuppressor)
+	stream.SetAGCEnabled(b.UserConfig.GetAGCEnabled())
 	stream.SetErrorFunc(func(err error) {
 		if err != nil {
 			b.AddOutputLine(fmt.Sprintf("Microphone: %s", err.Error()))

client_notification_test.go

@@ -70,6 +70,38 @@ func TestNotificationExpansionIsSinglePassAndNotifyDoesNotBlock(t *testing.T) {
 	}
 }
 
+func TestAudioIntervalDuration(t *testing.T) {
+	for _, milliseconds := range []int{10, 20, 40, 60} {
+		got, err := audioIntervalDuration(milliseconds)
+		if err != nil {
+			t.Errorf("audioIntervalDuration(%d): %v", milliseconds, err)
+			continue
+		}
+		if got != time.Duration(milliseconds)*time.Millisecond {
+			t.Errorf("audioIntervalDuration(%d) = %v", milliseconds, got)
+		}
+	}
+	if _, err := audioIntervalDuration(30); err == nil {
+		t.Fatal("audioIntervalDuration accepted unsupported duration")
+	}
+}
+
+func TestJitterBufferDuration(t *testing.T) {
+	for _, milliseconds := range []int{0, 20, 40, 60} {
+		got, err := jitterBufferDuration(milliseconds)
+		if err != nil {
+			t.Errorf("jitterBufferDuration(%d): %v", milliseconds, err)
+			continue
+		}
+		if got != time.Duration(milliseconds)*time.Millisecond {
+			t.Errorf("jitterBufferDuration(%d) = %v", milliseconds, got)
+		}
+	}
+	if _, err := jitterBufferDuration(10); err == nil {
+		t.Fatal("jitterBufferDuration accepted unsupported duration")
+	}
+}
+
 func TestServerAddressDefaultsPortWithoutBreakingIPv6(t *testing.T) {
 	for input, want := range map[string]string{
 		"server":          "server:64738",

config/hotkey_config.go

@@ -21,4 +21,5 @@ type Hotkeys struct {
 	ScrollToBottom         *uiterm.Key
 	AdminMenu              *uiterm.Key
 	NoiseSuppressionToggle *uiterm.Key
+	AGCToggle              *uiterm.Key
 }

config/user_config.go

@@ -31,6 +31,7 @@ type exportableConfig struct {
 	Username                *string
 	NotifyCommand           *string
 	NoiseSuppressionEnabled *bool
+	AGCEnabled              *bool
 	Certificate             *string
 	RecordingFormat         *string
 	RecordingDirectory      *string
@@ -109,6 +110,7 @@ func (c *Config) LoadConfig() {
 		ScrollToBottom:         key(uiterm.KeyEnd),
 		AdminMenu:              key(uiterm.KeyF11),
 		NoiseSuppressionToggle: key(uiterm.KeyF9),
+		AGCToggle:              key(uiterm.KeyF12),
 	}
 	if fileExists(c.fn) {
 		var data []byte
@@ -155,6 +157,11 @@ func (c *Config) LoadConfig() {
 		enabled := false
 		jc.NoiseSuppressionEnabled = &enabled
 	}
+	if c.config.AGCEnabled == nil {
+		// AGC has always been active for the microphone, so keep it on by default.
+		enabled := true
+		jc.AGCEnabled = &enabled
+	}
 	if c.config.Certificate == nil {
 		cert := string("")
 		jc.Certificate = &cert
@@ -190,6 +197,7 @@ func (c *Config) ensureHotkeys() {
 		ScrollToBottom:         key(uiterm.KeyEnd),
 		AdminMenu:              key(uiterm.KeyF11),
 		NoiseSuppressionToggle: key(uiterm.KeyF9),
+		AGCToggle:              key(uiterm.KeyF12),
 	}
 	hotkeys := c.config.Hotkeys
 	if hotkeys.Talk == nil {
@@ -240,6 +248,9 @@ func (c *Config) ensureHotkeys() {
 	if hotkeys.NoiseSuppressionToggle == nil {
 		hotkeys.NoiseSuppressionToggle = defaults.NoiseSuppressionToggle
 	}
+	if hotkeys.AGCToggle == nil {
+		hotkeys.AGCToggle = defaults.AGCToggle
+	}
 }
 
 func (c *Config) findServer(address string) *server {
@@ -365,6 +376,22 @@ func (c *Config) SetNoiseSuppressionEnabled(enabled bool) error {
 	return c.saveConfigLocked()
 }
 
+func (c *Config) GetAGCEnabled() bool {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	if c.config.AGCEnabled == nil {
+		return true
+	}
+	return *c.config.AGCEnabled
+}
+
+func (c *Config) SetAGCEnabled(enabled bool) error {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	c.config.AGCEnabled = &enabled
+	return c.saveConfigLocked()
+}
+
 func (c *Config) GetRecordingFormat() string {
 	c.mu.Lock()
 	defer c.mu.Unlock()

config/user_config_test.go

@@ -74,6 +74,35 @@ func TestConfigBackfillsRecordingDefaults(t *testing.T) {
 	}
 }
 
+func TestAGCDefaultsOnAndPersists(t *testing.T) {
+	configPath := filepath.Join(t.TempDir(), "barnard.toml")
+	if err := os.WriteFile(configPath, []byte("[hotkeys]\ntalk = \"f1\"\n"), 0600); err != nil {
+		t.Fatal(err)
+	}
+
+	cfg := NewConfig(&configPath)
+	if !cfg.GetAGCEnabled() {
+		t.Fatal("expected AGC to default to enabled")
+	}
+	if cfg.GetHotkeys().AGCToggle == nil {
+		t.Fatal("expected AGC toggle hotkey to be backfilled")
+	}
+	if got := *cfg.GetHotkeys().AGCToggle; got != uiterm.KeyF12 {
+		t.Fatalf("expected AGC toggle f12, got %s", got)
+	}
+
+	if err := cfg.SetAGCEnabled(false); err != nil {
+		t.Fatal(err)
+	}
+	reloaded := NewConfig(&configPath)
+	if reloaded.GetAGCEnabled() {
+		t.Fatal("expected disabled AGC setting to persist")
+	}
+	if got := *reloaded.GetHotkeys().AGCToggle; got != uiterm.KeyF12 {
+		t.Fatalf("expected saved AGC toggle to reload as f12, got %s", got)
+	}
+}
+
 // Regression: malformed and IPv6 addresses were split at every colon and
 // could panic while merely reading a saved user preference.
 func TestMakeHostPortHandlesIPv6AndMalformedAddress(t *testing.T) {

gumble/gumble/audio.go

@@ -92,6 +92,10 @@ type AudioPacket struct {
 
 	AudioBuffer
 
+	// Terminator marks the final packet in a talk burst. Audio listeners use
+	// it to discard ordering state before the sender starts a new burst.
+	Terminator bool
+
 	HasPosition      bool
 	X, Y, Z          float32
 	VolumeAdjustment float32

gumble/gumble/client.go

@@ -3,6 +3,7 @@ package gumble
 import (
 	"crypto/tls"
 	"errors"
+	"fmt"
 	"math"
 	"net"
 	"runtime"
@@ -101,6 +102,19 @@ func Dial(config *Config) (*Client, error) {
 	return DialWithDialer(new(net.Dialer), config, nil)
 }
 
+// tlsServerName returns the hostname portion of a Mumble server address for
+// TLS certificate verification and SNI.
+func tlsServerName(address string) (string, error) {
+	host, _, err := net.SplitHostPort(address)
+	if err != nil {
+		return "", fmt.Errorf("gumble: derive TLS server name from %q: %w", address, err)
+	}
+	if host == "" {
+		return "", fmt.Errorf("gumble: derive TLS server name from %q: empty host", address)
+	}
+	return host, nil
+}
+
 // DialWithDialer connects to the Mumble server at the address given in config.
 //
 // The function returns after the connection has been established, the initial
@@ -120,6 +134,23 @@ func DialWithDialer(dialer *net.Dialer, config *Config, tlsConfig *tls.Config) (
 	if err != nil {
 		return nil, err
 	}
+
+	// tls.Client cannot infer a server name from an already-open connection.
+	// Clone the caller's configuration before deriving it so reconnects and
+	// concurrent clients do not mutate a shared configuration.
+	if tlsConfig == nil {
+		tlsConfig = &tls.Config{}
+	} else {
+		tlsConfig = tlsConfig.Clone()
+	}
+	if tlsConfig.ServerName == "" {
+		serverName, err := tlsServerName(config.Address)
+		if err != nil {
+			rawConn.Close()
+			return nil, err
+		}
+		tlsConfig.ServerName = serverName
+	}
 	conn := tls.Client(rawConn, tlsConfig)
 	// net.Dialer.Timeout covers only the TCP dial. Apply the same bounded
 	// deadline to TLS negotiation so a peer that accepts but never responds

gumble/gumble/client_tls_test.go

@@ -0,0 +1,28 @@
+package gumble
+
+import "testing"
+
+func TestTLSServerNameUsesAddressHost(t *testing.T) {
+	for _, test := range []struct {
+		address string
+		want    string
+	}{
+		{"mumble.example:64738", "mumble.example"},
+		{"[2001:db8::1]:64738", "2001:db8::1"},
+	} {
+		got, err := tlsServerName(test.address)
+		if err != nil {
+			t.Errorf("tlsServerName(%q): %v", test.address, err)
+			continue
+		}
+		if got != test.want {
+			t.Errorf("tlsServerName(%q) = %q, want %q", test.address, got, test.want)
+		}
+	}
+}
+
+func TestTLSServerNameRejectsAddressWithoutHost(t *testing.T) {
+	if _, err := tlsServerName(":64738"); err == nil {
+		t.Fatal("tlsServerName accepted an empty host")
+	}
+}

gumble/gumble/config.go

@@ -25,6 +25,9 @@ type Config struct {
 	AudioInterval time.Duration
 	// AudioDataBytes is the number of bytes that an audio frame can use.
 	AudioDataBytes int
+	// IncomingAudioBuffer is the amount of per-speaker audio retained before
+	// playback starts, absorbing jitter in incoming UDP packet delivery.
+	IncomingAudioBuffer time.Duration
 
 	// DisableUDP forces all audio to use the TCP tunnel instead of UDP.
 	DisableUDP bool
@@ -38,9 +41,10 @@ type Config struct {
 // NewConfig returns a new Config struct with default values set.
 func NewConfig() *Config {
 	return &Config{
-		Buffers:        8,
-		AudioInterval:  AudioDefaultInterval,
-		AudioDataBytes: AudioDefaultDataBytes,
+		Buffers:             8,
+		AudioInterval:       AudioDefaultInterval,
+		AudioDataBytes:      AudioDefaultDataBytes,
+		IncomingAudioBuffer: 40 * time.Millisecond,
 	}
 }
 
@@ -54,6 +58,9 @@ func (c *Config) Validate() error {
 	if c.AudioDataBytes <= 0 {
 		return fmt.Errorf("gumble: AudioDataBytes must be positive")
 	}
+	if c.IncomingAudioBuffer < 0 {
+		return fmt.Errorf("gumble: IncomingAudioBuffer must not be negative")
+	}
 	if c.Buffers <= 0 {
 		return fmt.Errorf("gumble: Buffers must be positive")
 	}

gumble/gumble/handlers.go

@@ -223,6 +223,11 @@ func (c *Client) handleUDPTunnel(buffer []byte) error {
 	}
 
 	c.dispatchAudio(user, &event)
+	if isFinal {
+		decoder.Reset()
+		user.audioSequenceValid = false
+		c.dispatchAudio(user, &AudioPacket{Client: c, Sender: user, Terminator: true})
+	}
 	return nil
 }
 

gumble/gumble/udp.go

@@ -59,7 +59,10 @@ func (c *Client) udpReadRoutine() {
 			return
 		}
 		packetCount++
-		if log.Enabled(log.LevelDebug) {
+		// A synchronous log write for every UDP datagram can itself make the
+		// reader fall behind and lose voice packets. Keep enough samples to
+		// diagnose framing while avoiding work on the audio hot path.
+		if log.Enabled(log.LevelDebug) && (packetCount <= 3 || packetCount%1000 == 0) {
 			log.Debug("UDP recv #%d: %d bytes from %s hex=%s",
 				packetCount, n, addr, hex.EncodeToString(buf[:n]))
 		}

gumble/gumble/udp15.go

@@ -292,10 +292,13 @@ func (cs *cryptState15) decrypt15(packet []byte) ([]byte, error) {
 			backupIV(cs.decryptIV[:])
 			restore = true
 		} else if ivByte > cs.decryptIV[0] && diff > 0 {
-			// We missed packets; catch up. Already handled above.
+			// We missed packets; move the low IV byte forward.
+			cs.decryptIV[0] = ivByte
 		} else if ivByte < cs.decryptIV[0] && diff > 0 {
-			// Wrapped forward; advance and catch up.
-			advanceIV(cs.decryptIV[:])
+			// We missed packets across a low-byte wrap. The IV's higher
+			// bytes must advance even though the received low byte is set
+			// below rather than incremented.
+			advanceIVHighBytes(cs.decryptIV[:])
 			cs.decryptIV[0] = ivByte
 		} else {
 			return nil, errors.New("gumble: OCB IV too far off")
@@ -340,6 +343,16 @@ func advanceIV(iv []byte) {
 	}
 }
 
+// advanceIVHighBytes advances all but the low IV byte as a little-endian integer.
+func advanceIVHighBytes(iv []byte) {
+	for i := 1; i < len(iv); i++ {
+		iv[i]++
+		if iv[i] != 0 {
+			break
+		}
+	}
+}
+
 // backupIV decrements a 16-byte IV as a little-endian integer.
 func backupIV(iv []byte) {
 	for i := 0; i < len(iv); i++ {
@@ -626,8 +639,10 @@ func (c *Client) WriteAudioUDP15(format byte, target uint32, sequence int64, dat
 		return false, err
 	}
 
-	log.Debug("UDP15 send: frame=%d opus_len=%d enc_len=%d final=%v",
-		frameNum, len(data), len(encrypted), final)
+	if log.Enabled(log.LevelDebug) && (frameNum < 3 || frameNum%1000 == 0 || final) {
+		log.Debug("UDP15 send: frame=%d opus_len=%d enc_len=%d final=%v",
+			frameNum, len(data), len(encrypted), final)
+	}
 
 	_, err = udpConn.Write(encrypted)
 	if err != nil {
@@ -662,7 +677,9 @@ func (c *Client) HandleUDPPacket15(packet []byte, pktNum uint64) {
 		return
 	}
 
-	log.Debug("UDP15 #%d: decrypt OK, plaintext_len=%d", pktNum, len(plaintext))
+	if log.Enabled(log.LevelDebug) && (pktNum <= 3 || pktNum%1000 == 0) {
+		log.Debug("UDP15 #%d: decrypt OK, plaintext_len=%d", pktNum, len(plaintext))
+	}
 	c.markUDPActive()
 
 	// Check type byte (0x00 = Audio, 0x01 = Ping)
@@ -735,6 +752,9 @@ func (c *Client) dispatchOpus15(pktNum uint64, session uint32, frameNum int64, o
 		decoder.Reset()
 		user.audioSequenceValid = false
 		user.audioFrameStep = 0
+		// The audio stream remains open between talk bursts. Deliver the
+		// terminator so listeners can reset their own packet ordering state.
+		c.dispatchAudio(user, &AudioPacket{Client: c, Sender: user, Terminator: true})
 		log.Info("UDP15 #%d: terminator for %s, decoder reset", pktNum, user.Name)
 		return
 	}
@@ -743,7 +763,7 @@ func (c *Client) dispatchOpus15(pktNum uint64, session uint32, frameNum int64, o
 		return
 	}
 
-	c.decodeAndDispatch(pktNum, user, decoder, frameNum, opusData, context, position, volumeAdjustment)
+	c.decodeAndDispatch(pktNum, user, decoder, frameNum, opusData, terminator, context, position, volumeAdjustment)
 }
 
 // handleLegacyUDPVoice parses the legacy UDPVoice format (type byte 0x80)
@@ -792,7 +812,7 @@ func (c *Client) handleLegacyUDPVoice(pktNum uint64, data []byte) {
 }
 
 // decodeAndDispatch decodes an Opus frame and dispatches PCM to audio listeners.
-func (c *Client) decodeAndDispatch(pktNum uint64, user *User, decoder AudioDecoder, frameNum int64, opusData []byte, context uint32, position *[3]float32, volumeAdjustment float32) {
+func (c *Client) decodeAndDispatch(pktNum uint64, user *User, decoder AudioDecoder, frameNum int64, opusData []byte, terminator bool, context uint32, position *[3]float32, volumeAdjustment float32) {
 	// Frame numbers are timestamps in 10 ms units, not packet counters. For
 	// example, a standard 20 ms Opus packet advances its frame number by two.
 	// Only generate PLC for complete missing packets; treating every timestamp
@@ -828,7 +848,9 @@ func (c *Client) decodeAndDispatch(pktNum uint64, user *User, decoder AudioDecod
 		return
 	}
 
-	log.Debug("UDP15 #%d: Opus OK for %s, pcm_samples=%d", pktNum, user.Name, len(pcm))
+	if log.Enabled(log.LevelDebug) && (pktNum <= 3 || pktNum%1000 == 0) {
+		log.Debug("UDP15 #%d: Opus OK for %s, pcm_samples=%d", pktNum, user.Name, len(pcm))
+	}
 	user.audioSequence = frameNum
 	user.audioSequenceValid = true
 	user.audioFrameStep = audioFrameStep(len(pcm))
@@ -846,6 +868,12 @@ func (c *Client) decodeAndDispatch(pktNum uint64, user *User, decoder AudioDecod
 		event.X, event.Y, event.Z = position[0], position[1], position[2]
 	}
 	c.dispatchAudio(user, &event)
+	if terminator {
+		decoder.Reset()
+		user.audioSequenceValid = false
+		user.audioFrameStep = 0
+		c.dispatchAudio(user, &AudioPacket{Client: c, Sender: user, Terminator: true})
+	}
 }
 
 // missingAudioPackets returns the number of whole packets absent from a

gumble/gumble/udp15_terminator_test.go

@@ -0,0 +1,37 @@
+package gumble
+
+import "testing"
+
+type terminatorDecoder struct{ resets int }
+
+func (d *terminatorDecoder) ID() int                             { return audioCodecIDOpus }
+func (d *terminatorDecoder) Decode([]byte, int) ([]int16, error) { return nil, nil }
+func (d *terminatorDecoder) Reset()                              { d.resets++ }
+
+type terminatorListener struct{ packets chan *AudioPacket }
+
+func (l *terminatorListener) OnAudioStream(e *AudioStreamEvent) {
+	go func() { l.packets <- <-e.C }()
+}
+
+func TestUDP15EmptyTerminatorResetsAudioListeners(t *testing.T) {
+	decoder := &terminatorDecoder{}
+	listener := &terminatorListener{packets: make(chan *AudioPacket, 1)}
+	config := NewConfig()
+	config.AttachAudio(listener)
+	user := &User{Session: 1, Name: "speaker", decoder: decoder, audioSequenceValid: true}
+	client := &Client{Config: config, Users: Users{user.Session: user}}
+
+	client.dispatchOpus15(1, user.Session, 0, nil, true, 0, nil, 0)
+
+	packet := <-listener.packets
+	if !packet.Terminator {
+		t.Fatal("empty UDP terminator was not delivered to audio listeners")
+	}
+	if packet.AudioBuffer != nil {
+		t.Fatalf("terminator carried unexpected audio: %v", packet.AudioBuffer)
+	}
+	if decoder.resets != 1 || user.audioSequenceValid {
+		t.Fatalf("terminator did not reset decoder state: resets=%d valid=%v", decoder.resets, user.audioSequenceValid)
+	}
+}

gumble/gumble/udp15_test.go

@@ -32,6 +32,75 @@ func TestAdvanceIV(t *testing.T) {
 }
 
 // Regression coverage for the native IV carry path at the 255->256 wrap.
+func TestCryptState15DecryptsAfterMissedPackets(t *testing.T) {
+	key := mustDecodeHex("93360b0f86a926c4561563469026eb94")
+	nonce := mustDecodeHex("10000000000000000000000000000000")
+	out, in := &cryptState15{}, &cryptState15{}
+	if err := out.setup15(key, nonce, nonce); err != nil {
+		t.Fatal(err)
+	}
+	if err := in.setup15(key, nonce, nonce); err != nil {
+		t.Fatal(err)
+	}
+
+	first, err := out.encrypt15([]byte("first"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, err := in.decrypt15(first); err != nil {
+		t.Fatal(err)
+	}
+	for i := 0; i < 3; i++ {
+		if _, err := out.encrypt15([]byte("dropped")); err != nil {
+			t.Fatal(err)
+		}
+	}
+	last, err := out.encrypt15([]byte("after loss"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	plain, err := in.decrypt15(last)
+	if err != nil || !bytes.Equal(plain, []byte("after loss")) {
+		t.Fatalf("decrypt after missed packets = %q, %v", plain, err)
+	}
+}
+
+func TestCryptState15DecryptsAfterMissedPacketsAcrossIVByteWrap(t *testing.T) {
+	key := mustDecodeHex("93360b0f86a926c4561563469026eb94")
+	nonce := mustDecodeHex("fa000000000000000000000000000000")
+	out, in := &cryptState15{}, &cryptState15{}
+	if err := out.setup15(key, nonce, nonce); err != nil {
+		t.Fatal(err)
+	}
+	if err := in.setup15(key, nonce, nonce); err != nil {
+		t.Fatal(err)
+	}
+
+	first, err := out.encrypt15([]byte("before wrap"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, err := in.decrypt15(first); err != nil {
+		t.Fatal(err)
+	}
+	for i := 0; i < 6; i++ {
+		if _, err := out.encrypt15([]byte("dropped")); err != nil {
+			t.Fatal(err)
+		}
+	}
+	last, err := out.encrypt15([]byte("after wrap"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	plain, err := in.decrypt15(last)
+	if err != nil || !bytes.Equal(plain, []byte("after wrap")) {
+		t.Fatalf("decrypt after missed packets across IV wrap = %q, %v", plain, err)
+	}
+	if in.decryptIV[0] != 2 || in.decryptIV[1] != 1 {
+		t.Fatalf("unexpected IV after wrapped loss: %x", in.decryptIV[:2])
+	}
+}
+
 func TestCryptState15DecryptsAcrossIVByteWrap(t *testing.T) {
 	key := mustDecodeHex("93360b0f86a926c4561563469026eb94")
 	clientNonce := mustDecodeHex("ff000000000000000000000000000000")

gumble/gumbleopenal/stream.go

@@ -52,14 +52,46 @@ const recorderOutgoingSource uint32 = ^uint32(0)
 
 const (
 	maxBufferSize    = 11520 // Max frame size (2880) * bytes per stereo sample (4)
-	jitterMinPackets = 3
-	jitterMaxPackets = 10
+	jitterMaxPackets = 50
+	// Mumble destroys and recreates AudioInput when the sender switches audio
+	// devices, which restarts its frame numbering at zero. The destructor
+	// sends no terminator, so a sender that never unkeys leaves us expecting a
+	// frame number the new stream will not reach for hours: every packet looks
+	// permanently late and gets discarded. Detect that and resync.
+	//
+	// Two conditions must hold together. A sustained run of late packets
+	// distinguishes a restarted stream from a clump of reordered packets,
+	// which is bounded and then recovers on its own. The backwards jump must
+	// also be too large to be network reordering; a smaller jump needs no
+	// intervention because the restarted stream climbs back past the stale
+	// expectation within jitterResyncJump frames anyway.
+	jitterLateResync = 5
+	// Frame numbers are Mumble timestamps in 10 ms units, so this is 1 second
+	// — far beyond any real reordering window.
+	jitterResyncJump = 100
 )
 
-// jitterPlaybackReady holds the initial playout delay only once. Requiring
-// the minimum on every packet drains and refills the renderer in bursts.
-func jitterPlaybackReady(started bool, buffered int) bool {
-	return started || buffered >= jitterMinPackets
+// jitterShouldResync reports whether the sender restarted its frame numbering
+// rather than merely delivering a few packets out of order. lateRun is the
+// number of consecutive late packets and backJump is how far the current
+// packet sits below the expected sequence.
+func jitterShouldResync(lateRun int, backJump int64) bool {
+	return lateRun >= jitterLateResync && backJump >= jitterResyncJump
+}
+
+// jitterPlaybackReady holds the requested initial playout delay only once.
+// Requiring the delay on every packet drains and refills the renderer in bursts.
+func jitterPlaybackReady(started bool, buffered, target time.Duration) bool {
+	return started || buffered >= target
+}
+
+func audioPacketDuration(packet *gumble.AudioPacket) time.Duration {
+	if packet == nil || len(packet.AudioBuffer) == 0 {
+		return 0
+	}
+	// Opus decoders deliver interleaved stereo PCM to this renderer.
+	frames := len(packet.AudioBuffer) / gumble.AudioChannels
+	return time.Duration(frames) * time.Second / gumble.AudioSampleRate
 }
 
 var (
@@ -256,6 +288,23 @@ func (s *Stream) SetNoiseProcessor(np NoiseProcessor) {
 	s.noiseProcessorRight = cloneNoiseProcessor(np)
 }
 
+// SetAGCEnabled turns microphone automatic gain control on or off. The AGC
+// objects themselves are created up front, so this only flips their flag and is
+// safe to call while capture is running.
+func (s *Stream) SetAGCEnabled(enabled bool) {
+	if s.micAGC != nil {
+		s.micAGC.SetEnabled(enabled)
+	}
+	if s.micAGCRight != nil {
+		s.micAGCRight.SetEnabled(enabled)
+	}
+}
+
+// IsAGCEnabled reports whether microphone automatic gain control is active.
+func (s *Stream) IsAGCEnabled() bool {
+	return s.micAGC != nil && s.micAGC.IsEnabled()
+}
+
 func (s *Stream) SetFilePlayer(fp FilePlayer) {
 	s.filePlayer = fp
 	if player, ok := fp.(interface{ SetLocalPlayback(func([]byte)) }); ok {
@@ -484,8 +533,19 @@ func (s *Stream) OnAudioStream(e *gumble.AudioStreamEvent) {
 		// Jitter buffer: collects incoming packets, reorders by
 		// sequence number, and releases them after a small initial delay.
 		var jitterBuf []*gumble.AudioPacket
+		var jitterDuration time.Duration
 		var jitterNextSeq int64
 		var jitterInit, jitterStarted bool
+		var jitterLateRun int
+		var jitterDrainLogCounter, jitterAnomalyLogCounter int
+		resetJitter := func() {
+			jitterBuf = nil
+			jitterDuration = 0
+			jitterNextSeq = 0
+			jitterInit = false
+			jitterStarted = false
+			jitterLateRun = 0
+		}
 
 		// insertSorted inserts a packet into the jitter buffer sorted
 		// by sequence number.
@@ -506,6 +566,7 @@ func (s *Stream) OnAudioStream(e *gumble.AudioStreamEvent) {
 			jitterBuf = append(jitterBuf, nil)
 			copy(jitterBuf[i+1:], jitterBuf[i:])
 			jitterBuf[i] = p
+			jitterDuration += audioPacketDuration(p)
 		}
 
 		// popNext removes and returns the packet with the expected next
@@ -516,6 +577,7 @@ func (s *Stream) OnAudioStream(e *gumble.AudioStreamEvent) {
 			}
 			p := jitterBuf[0]
 			jitterBuf = jitterBuf[1:]
+			jitterDuration -= audioPacketDuration(p)
 			// Frame numbers are Mumble timestamps in 10 ms units.
 			// Compute the actual step from the PCM sample count so we
 			// never skip a legitimate gap.
@@ -540,6 +602,14 @@ func (s *Stream) OnAudioStream(e *gumble.AudioStreamEvent) {
 		}
 
 		for packet := range e.C {
+			// A talk burst may restart its frame numbers from zero. Reset before
+			// testing local mute so an unmute cannot retain the previous burst's
+			// timestamp and discard the new burst as permanently late.
+			if packet.Terminator {
+				resetJitter()
+				continue
+			}
+
 			// Skip processing if user is locally muted
 			if e.User.LocallyMuted() {
 				continue
@@ -556,31 +626,48 @@ func (s *Stream) OnAudioStream(e *gumble.AudioStreamEvent) {
 
 			// Hold only the initial packets. Once playback starts, drain every
 			// ready packet so the renderer is fed continuously rather than in
-			// bursts of jitterMinPackets packets.
-			if !jitterPlaybackReady(jitterStarted, len(jitterBuf)) {
+			// bursts of packets.
+			if !jitterPlaybackReady(jitterStarted, jitterDuration, e.Client.Config.IncomingAudioBuffer) {
 				continue
 			}
 			jitterStarted = true
 
 			// Drain all packets that are ready (in sequence order)
-			drainedCount := 0
 			for {
 				pkt := popNext()
 				if pkt == nil {
 					if len(jitterBuf) > 0 {
 						if jitterBuf[0].Sequence < jitterNextSeq {
+							jitterLateRun++
+							if jitterShouldResync(jitterLateRun, jitterNextSeq-jitterBuf[0].Sequence) {
+								// The sender restarted its frame numbering
+								// mid-burst. Follow it instead of discarding
+								// every remaining packet until it unkeys.
+								log.Debug("jitter: sequence restart for %s, resyncing from %d to %d",
+									e.User.Name, jitterNextSeq, jitterBuf[0].Sequence)
+								jitterNextSeq = jitterBuf[0].Sequence
+								jitterLateRun = 0
+								continue
+							}
 							// Late or duplicate: discard so it doesn't
 							// permanently block the drain loop.
-							log.Debug("jitter: discarding late seq=%d for %s (next=%d buf=%d)",
-								jitterBuf[0].Sequence, e.User.Name, jitterNextSeq, len(jitterBuf))
+							jitterAnomalyLogCounter++
+							if jitterAnomalyLogCounter <= 3 || jitterAnomalyLogCounter%1000 == 0 {
+								log.Debug("jitter: discarding late seq=%d for %s (next=%d buf=%d)",
+									jitterBuf[0].Sequence, e.User.Name, jitterNextSeq, len(jitterBuf))
+							}
+							jitterDuration -= audioPacketDuration(jitterBuf[0])
 							jitterBuf = jitterBuf[1:]
 							continue
 						}
 						if jitterBuf[0].Sequence > jitterNextSeq {
 							// Gap in sequence: skip ahead so we don't
 							// wait forever for a lost packet.
-							log.Debug("jitter: seq gap for %s, skipping from %d to %d (buf=%d)",
-								e.User.Name, jitterNextSeq, jitterBuf[0].Sequence, len(jitterBuf))
+							jitterAnomalyLogCounter++
+							if jitterAnomalyLogCounter <= 3 || jitterAnomalyLogCounter%1000 == 0 {
+								log.Debug("jitter: seq gap for %s, skipping from %d to %d (buf=%d)",
+									e.User.Name, jitterNextSeq, jitterBuf[0].Sequence, len(jitterBuf))
+							}
 							jitterNextSeq = jitterBuf[0].Sequence
 							continue
 						}
@@ -589,8 +676,9 @@ func (s *Stream) OnAudioStream(e *gumble.AudioStreamEvent) {
 					}
 					break
 				}
-				drainedCount++
-				if drainedCount <= 3 || drainedCount%50 == 0 {
+				jitterLateRun = 0
+				jitterDrainLogCounter++
+				if jitterDrainLogCounter <= 3 || jitterDrainLogCounter%1000 == 0 {
 					log.Debug("jitter: draining seq=%d for %s (buf=%d emptyBufs=%d)",
 						pkt.Sequence, e.User.Name, len(jitterBuf), len(emptyBufs))
 				}
@@ -1002,7 +1090,7 @@ func (s *Stream) processChannel(samples []int16, noiseProcessor NoiseProcessor,
 	if noiseProcessor != nil && noiseProcessor.IsEnabled() {
 		noiseProcessor.ProcessSamples(samples)
 	}
-	if micAGC != nil {
+	if micAGC != nil && micAGC.IsEnabled() {
 		micAGC.ProcessSamples(samples)
 	}
 }
@@ -1010,6 +1098,9 @@ func (s *Stream) processChannel(samples []int16, noiseProcessor NoiseProcessor,
 func (s *Stream) ensureStereoProcessors() {
 	if s.micAGCRight == nil {
 		s.micAGCRight = audio.NewAGC()
+		if s.micAGC != nil {
+			s.micAGCRight.SetEnabled(s.micAGC.IsEnabled())
+		}
 	}
 	if s.noiseProcessorRight == nil {
 		s.noiseProcessorRight = cloneNoiseProcessor(s.noiseProcessor)

gumble/gumbleopenal/stream_regression_test.go

@@ -4,8 +4,10 @@ import (
 	"errors"
 	"strings"
 	"testing"
+	"time"
 
 	"git.stormux.org/storm/barnard/gumble/go-openal/openal"
+	"git.stormux.org/storm/barnard/gumble/gumble"
 )
 
 // Regression: audio cleanup could send a final render command after Destroy
@@ -49,17 +51,43 @@ func TestStopSourceWaitsForWorker(t *testing.T) {
 }
 
 func TestJitterPlaybackDelayAppliesOnlyAtStartup(t *testing.T) {
-	if jitterPlaybackReady(false, jitterMinPackets-1) {
+	if jitterPlaybackReady(false, 20*time.Millisecond, 40*time.Millisecond) {
 		t.Fatal("jitter playback started before initial buffer filled")
 	}
-	if !jitterPlaybackReady(false, jitterMinPackets) {
+	if !jitterPlaybackReady(false, 40*time.Millisecond, 40*time.Millisecond) {
 		t.Fatal("jitter playback did not start after initial buffer filled")
 	}
-	if !jitterPlaybackReady(true, 1) {
+	if !jitterPlaybackReady(true, 0, 40*time.Millisecond) {
 		t.Fatal("jitter playback paused while refilling after startup")
 	}
 }
 
+func TestJitterResyncsAfterSenderRestartsSequence(t *testing.T) {
+	// Mumble restarts frame numbering at zero when the sender switches audio
+	// devices mid-burst, and sends no terminator to announce it.
+	if !jitterShouldResync(jitterLateResync, 52724) {
+		t.Fatal("jitter did not resync after the sender restarted its frame numbering")
+	}
+	if jitterShouldResync(jitterLateResync-1, 52724) {
+		t.Fatal("jitter resynced before the late run was conclusive")
+	}
+	// A clump of reordered packets is bounded and recovers on its own; it must
+	// not drag the expected sequence backwards.
+	if jitterShouldResync(jitterLateResync, jitterResyncJump-1) {
+		t.Fatal("jitter resynced on a backwards jump small enough to be reordering")
+	}
+	if jitterShouldResync(1, 52724) {
+		t.Fatal("jitter resynced on a single late packet")
+	}
+}
+
+func TestAudioPacketDurationUsesStereoFrameCount(t *testing.T) {
+	packet := &gumble.AudioPacket{AudioBuffer: make(gumble.AudioBuffer, 2*gumble.AudioDefaultFrameSize)}
+	if got := audioPacketDuration(packet); got != 10*time.Millisecond {
+		t.Fatalf("audioPacketDuration = %v, want 10ms", got)
+	}
+}
+
 func TestRenderRejectsWorkAfterShutdown(t *testing.T) {
 	s := &Stream{renderClosed: true}
 	called := false

main.go

@@ -11,6 +11,7 @@ import (
 	"net/http"
 	"os"
 	"strings"
+	"time"
 
 	barnlog "git.stormux.org/storm/barnard/log"
 
@@ -84,6 +85,8 @@ func main() {
 	configSet := false
 	certificateSet := false
 	buffers := flag.Int("buffers", 16, "number of audio buffers to use")
+	audioInterval := flag.Int("audio-interval", 10, "outgoing audio packet duration in ms (10, 20, 40, or 60)")
+	jitterBuffer := flag.Int("jitter-buffer", 40, "incoming per-user audio buffer in ms (0, 20, 40, or 60)")
 	profile := flag.Bool("profile", false, "add http server to serve profiles")
 	noiseSuppressionEnabled := flag.Bool("noise-suppression", false, "enable noise suppression for microphone input")
 	autoTransmit := flag.Bool("auto-transmit", false, "start transmitting immediately on connect")
@@ -94,6 +97,14 @@ func main() {
 	logFile := flag.String("logfile", "", "write logs to this file (logging is disabled when omitted)")
 
 	flag.Parse()
+	selectedAudioInterval, err := audioIntervalDuration(*audioInterval)
+	if err != nil {
+		handle_raw_error(err)
+	}
+	selectedJitterBuffer, err := jitterBufferDuration(*jitterBuffer)
+	if err != nil {
+		handle_raw_error(err)
+	}
 
 	// Set up logging
 	var level barnlog.Level
@@ -192,6 +203,8 @@ func main() {
 		NoiseSuppressor: noise.NewSuppressor(),
 	}
 	b.Config.Buffers = *buffers
+	b.Config.AudioInterval = selectedAudioInterval
+	b.Config.IncomingAudioBuffer = selectedJitterBuffer
 	b.Config.DisableUDP = *tcpOnly
 
 	b.Hotkeys = b.UserConfig.GetHotkeys()
@@ -238,6 +251,30 @@ func main() {
 	handle_error(&b)
 }
 
+// audioIntervalDuration converts the packet duration requested at startup to
+// one of the Opus durations supported by Mumble.
+func audioIntervalDuration(milliseconds int) (time.Duration, error) {
+	interval := time.Duration(milliseconds) * time.Millisecond
+	switch interval {
+	case 10 * time.Millisecond, 20 * time.Millisecond, 40 * time.Millisecond, 60 * time.Millisecond:
+		return interval, nil
+	default:
+		return 0, fmt.Errorf("audio interval must be 10, 20, 40, or 60 ms, got %d", milliseconds)
+	}
+}
+
+// jitterBufferDuration converts the requested incoming playout delay to a
+// supported duration. Zero starts playback without an initial safety buffer.
+func jitterBufferDuration(milliseconds int) (time.Duration, error) {
+	interval := time.Duration(milliseconds) * time.Millisecond
+	switch interval {
+	case 0, 20 * time.Millisecond, 40 * time.Millisecond, 60 * time.Millisecond:
+		return interval, nil
+	default:
+		return 0, fmt.Errorf("jitter buffer must be 0, 20, 40, or 60 ms, got %d", milliseconds)
+	}
+}
+
 // serverAddress adds Mumble's default port without corrupting an IPv6 literal.
 func serverAddress(address string) string {
 	if _, port, err := net.SplitHostPort(address); err == nil && port != "" {

ui.go

@@ -141,6 +141,29 @@ func (b *Barnard) OnNoiseSuppressionToggle(ui *uiterm.Ui, key uiterm.Key) {
 	}
 }
 
+func (b *Barnard) OnAGCToggle(ui *uiterm.Ui, key uiterm.Key) {
+	enabled := b.toggleAGC()
+
+	if enabled {
+		b.UpdateGeneralStatus("AGC: ON", false)
+	} else {
+		b.UpdateGeneralStatus("AGC: OFF", false)
+	}
+}
+
+// toggleAGC flips the saved AGC preference and applies it to the active
+// stream, returning the new state.
+func (b *Barnard) toggleAGC() bool {
+	enabled := !b.UserConfig.GetAGCEnabled()
+	if err := b.UserConfig.SetAGCEnabled(enabled); err != nil {
+		b.AddOutputLine("AGC: could not save setting: " + err.Error())
+	}
+	b.withStream(func(stream *gumbleopenal.Stream) {
+		stream.SetAGCEnabled(enabled)
+	})
+	return enabled
+}
+
 func (b *Barnard) UpdateGeneralStatus(text string, notice bool) {
 	b.postUI(func() {
 		b.statusText = text
@@ -212,6 +235,14 @@ func (b *Barnard) CommandNoiseSuppressionToggle(ui *uiterm.Ui, cmd string) {
 	}
 }
 
+func (b *Barnard) CommandAGCToggle(ui *uiterm.Ui, cmd string) {
+	if b.toggleAGC() {
+		b.AddOutputLine("AGC enabled")
+	} else {
+		b.AddOutputLine("AGC disabled")
+	}
+}
+
 func (b *Barnard) CommandPlayFile(ui *uiterm.Ui, cmd string) {
 	// cmd contains just the filename part (everything after "/file ")
 	filename := strings.TrimSpace(cmd)
@@ -498,6 +529,8 @@ func (b *Barnard) OnTextInput(ui *uiterm.Ui, textbox *uiterm.Textbox, text strin
 			b.CommandStatus(ui, cmdArgs)
 		case "noise":
 			b.CommandNoiseSuppressionToggle(ui, cmdArgs)
+		case "agc":
+			b.CommandAGCToggle(ui, cmdArgs)
 		case "record":
 			b.CommandRecord(ui, cmdArgs)
 		case "admin":
@@ -595,6 +628,7 @@ func (b *Barnard) OnUiInitialize(ui *uiterm.Ui) {
 	b.Ui.AddCommandListener(b.CommandExit, "exit")
 	b.Ui.AddCommandListener(b.CommandStatus, "status")
 	b.Ui.AddCommandListener(b.CommandNoiseSuppressionToggle, "noise")
+	b.Ui.AddCommandListener(b.CommandAGCToggle, "agc")
 	b.Ui.AddCommandListener(b.CommandPlayFile, "file")
 	b.Ui.AddCommandListener(b.CommandStopFile, "stop")
 	b.Ui.AddCommandListener(b.CommandRecord, "record")
@@ -604,6 +638,7 @@ func (b *Barnard) OnUiInitialize(ui *uiterm.Ui) {
 	b.Ui.AddKeyListener(b.OnVoiceToggle, b.Hotkeys.Talk)
 	b.Ui.AddKeyListener(b.OnTimestampToggle, b.Hotkeys.ToggleTimestamps)
 	b.Ui.AddKeyListener(b.OnNoiseSuppressionToggle, b.Hotkeys.NoiseSuppressionToggle)
+	b.Ui.AddKeyListener(b.OnAGCToggle, b.Hotkeys.AGCToggle)
 	b.Ui.AddKeyListener(b.OnRecordingToggle, b.Hotkeys.RecordToggle)
 	b.Ui.AddKeyListener(b.OnClearPress, b.Hotkeys.ClearOutput)
 	b.Ui.AddKeyListener(b.OnQuitPress, b.Hotkeys.Exit)

ui_tree.go

@@ -38,7 +38,7 @@ func (ti TreeItem) TreeItemStyle(fg, bg uiterm.Attribute, active bool) (uiterm.A
 }
 
 func (b *Barnard) changeVolume(users []*gumble.User, change float32) {
-	b.withStream(func(stream *gumbleopenal.Stream) {
+	changed := b.withStream(func(stream *gumbleopenal.Stream) {
 		for _, u := range users {
 			var boost uint16
 			var ng float32
@@ -63,10 +63,13 @@ func (b *Barnard) changeVolume(users []*gumble.User, change float32) {
 			b.AddOutputLine("Volume: could not save setting: " + err.Error())
 		}
 	})
+	if changed {
+		b.refreshVolumeDisplay()
+	}
 }
 
 func (b *Barnard) resetVolume(users []*gumble.User) {
-	b.withStream(func(stream *gumbleopenal.Stream) {
+	changed := b.withStream(func(stream *gumbleopenal.Stream) {
 		for _, u := range users {
 			// Reset to original volume (1.0) and boost (1)
 			u.SetBoost(uint16(1))
@@ -78,6 +81,16 @@ func (b *Barnard) resetVolume(users []*gumble.User) {
 			b.AddOutputLine("Volume: could not save setting: " + err.Error())
 		}
 	})
+	if changed {
+		b.refreshVolumeDisplay()
+	}
+}
+
+// Tree items render a display string snapshotted at build time, so a volume
+// change is only visible after the tree is rebuilt.
+func (b *Barnard) refreshVolumeDisplay() {
+	b.RebuildUserChannelTreePreservingSelection()
+	b.Ui.Refresh()
 }
 
 func makeUsersArray(users gumble.Users) []*gumble.User {