diff --git a/pkg/agent/loop.go b/pkg/agent/loop.go
index 72c78c729..05ccbe449 100644
--- a/pkg/agent/loop.go
+++ b/pkg/agent/loop.go
@@ -18,6 +18,7 @@ import (
 	"sync/atomic"
 	"time"
 
+	"github.com/sipeed/picoclaw/pkg/asr"
 	"github.com/sipeed/picoclaw/pkg/bus"
 	"github.com/sipeed/picoclaw/pkg/channels"
 	"github.com/sipeed/picoclaw/pkg/commands"
@@ -31,7 +32,6 @@ import (
 	"github.com/sipeed/picoclaw/pkg/state"
 	"github.com/sipeed/picoclaw/pkg/tools"
 	"github.com/sipeed/picoclaw/pkg/utils"
-	"github.com/sipeed/picoclaw/pkg/voice"
 )
 
 type AgentLoop struct {
@@ -51,7 +51,7 @@ type AgentLoop struct {
 	fallback       *providers.FallbackChain
 	channelManager *channels.Manager
 	mediaStore     media.MediaStore
-	transcriber    voice.Transcriber
+	transcriber    asr.Transcriber
 	cmdRegistry    *commands.Registry
 	mcp            mcpRuntime
 	hookRuntime    hookRuntime
@@ -1040,7 +1040,7 @@ func (al *AgentLoop) SetMediaStore(s media.MediaStore) {
 }
 
 // SetTranscriber injects a voice transcriber for agent-level audio transcription.
-func (al *AgentLoop) SetTranscriber(t voice.Transcriber) {
+func (al *AgentLoop) SetTranscriber(t asr.Transcriber) {
 	al.transcriber = t
 }
 
diff --git a/pkg/voice/transcriber.go b/pkg/asr/asr.go
similarity index 99%
rename from pkg/voice/transcriber.go
rename to pkg/asr/asr.go
index 15f7fc0d0..1e2b73500 100644
--- a/pkg/voice/transcriber.go
+++ b/pkg/asr/asr.go
@@ -1,4 +1,4 @@
-package voice
+package asr
 
 import (
 	"bytes"
diff --git a/pkg/voice/transcriber_test.go b/pkg/asr/asr_test.go
similarity index 99%
rename from pkg/voice/transcriber_test.go
rename to pkg/asr/asr_test.go
index 20ba5388b..c6d04c08b 100644
--- a/pkg/voice/transcriber_test.go
+++ b/pkg/asr/asr_test.go
@@ -1,4 +1,4 @@
-package voice
+package asr
 
 import (
 	"testing"
diff --git a/pkg/audio/ogg.go b/pkg/audio/ogg.go
new file mode 100644
index 000000000..49a2b93f9
--- /dev/null
+++ b/pkg/audio/ogg.go
@@ -0,0 +1,55 @@
+package audio
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+)
+
+// DecodeOggOpus reads an Ogg format stream and extracts individual Opus payloads.
+// It calls onFrame for every complete Opus frame found in the stream.
+func DecodeOggOpus(r io.Reader, onFrame func([]byte) error) error {
+	var packet []byte
+	header := make([]byte, 27)
+
+	for {
+		if _, err := io.ReadFull(r, header); err != nil {
+			if err == io.EOF || err == io.ErrUnexpectedEOF {
+				return nil
+			}
+			return fmt.Errorf("failed to read ogg header: %w", err)
+		}
+		if string(header[:4]) != "OggS" {
+			return fmt.Errorf("invalid ogg magic string")
+		}
+
+		pageSegments := int(header[26])
+		segmentTable := make([]byte, pageSegments)
+		if _, err := io.ReadFull(r, segmentTable); err != nil {
+			return fmt.Errorf("failed to read segment table: %w", err)
+		}
+
+		for _, lacing := range segmentTable {
+			segment := make([]byte, lacing)
+			if _, err := io.ReadFull(r, segment); err != nil {
+				return fmt.Errorf("failed to read segment data: %w", err)
+			}
+
+			packet = append(packet, segment...)
+
+			// If lacing is less than 255, the packet is complete
+			if lacing < 255 {
+				if len(packet) > 0 {
+					// Ignore Ogg Opus headers
+					if !bytes.HasPrefix(packet, []byte("OpusHead")) && !bytes.HasPrefix(packet, []byte("OpusTags")) {
+						if err := onFrame(packet); err != nil {
+							return err
+						}
+					}
+					// Start new packet
+					packet = nil
+				}
+			}
+		}
+	}
+}
diff --git a/pkg/bus/types.go b/pkg/bus/types.go
index 9c637f3e7..e036b4ede 100644
--- a/pkg/bus/types.go
+++ b/pkg/bus/types.go
@@ -68,6 +68,6 @@ type AudioChunk struct {
 // VoiceControl represents state or commands for voice sessions.
 type VoiceControl struct {
 	SessionID string `json:"session_id"`
-	Type      string `json:"type"`  // "state", "command"
+	Type      string `json:"type"`   // "state", "command"
 	Action    string `json:"action"` // "idle", "listening", "start", "stop"
 }
diff --git a/pkg/channels/discord/discord.go b/pkg/channels/discord/discord.go
index 06a0f175f..ebdbd1437 100644
--- a/pkg/channels/discord/discord.go
+++ b/pkg/channels/discord/discord.go
@@ -20,8 +20,8 @@ import (
 	"github.com/sipeed/picoclaw/pkg/identity"
 	"github.com/sipeed/picoclaw/pkg/logger"
 	"github.com/sipeed/picoclaw/pkg/media"
+	"github.com/sipeed/picoclaw/pkg/tts"
 	"github.com/sipeed/picoclaw/pkg/utils"
-	"github.com/sipeed/picoclaw/pkg/voice"
 )
 
 const (
@@ -44,7 +44,7 @@ type DiscordChannel struct {
 	typingStop map[string]chan struct{} // chatID → stop signal
 	botUserID  string                   // stored for mention checking
 	bus        *bus.MessageBus
-	tts        voice.TTSProvider
+	tts        tts.TTSProvider
 }
 
 func NewDiscordChannel(cfg config.DiscordConfig, bus *bus.MessageBus) (*DiscordChannel, error) {
@@ -93,7 +93,7 @@ func (c *DiscordChannel) Start(ctx context.Context) error {
 	c.botUserID = botUser.ID
 
 	c.session.AddHandler(c.handleMessage)
-	
+
 	go c.listenVoiceControl(c.ctx)
 
 	if err := c.session.Open(); err != nil {
diff --git a/pkg/channels/discord/init.go b/pkg/channels/discord/init.go
index 13e4fbc91..e6be8ff36 100644
--- a/pkg/channels/discord/init.go
+++ b/pkg/channels/discord/init.go
@@ -4,14 +4,14 @@ import (
 	"github.com/sipeed/picoclaw/pkg/bus"
 	"github.com/sipeed/picoclaw/pkg/channels"
 	"github.com/sipeed/picoclaw/pkg/config"
-	"github.com/sipeed/picoclaw/pkg/voice"
+	"github.com/sipeed/picoclaw/pkg/tts"
 )
 
 func init() {
 	channels.RegisterFactory("discord", func(cfg *config.Config, b *bus.MessageBus) (channels.Channel, error) {
 		ch, err := NewDiscordChannel(cfg.Channels.Discord, b)
 		if err == nil {
-			ch.tts = voice.DetectTTS(cfg)
+			ch.tts = tts.DetectTTS(cfg)
 		}
 		return ch, err
 	})
diff --git a/pkg/gateway/gateway.go b/pkg/gateway/gateway.go
index f9d1c824b..ad7591e3a 100644
--- a/pkg/gateway/gateway.go
+++ b/pkg/gateway/gateway.go
@@ -12,6 +12,7 @@ import (
 	"time"
 
 	"github.com/sipeed/picoclaw/pkg/agent"
+	"github.com/sipeed/picoclaw/pkg/asr"
 	"github.com/sipeed/picoclaw/pkg/bus"
 	"github.com/sipeed/picoclaw/pkg/channels"
 	_ "github.com/sipeed/picoclaw/pkg/channels/dingtalk"
@@ -303,7 +304,7 @@ func setupAndStartServices(
 	agentLoop.SetChannelManager(runningServices.ChannelManager)
 	agentLoop.SetMediaStore(runningServices.MediaStore)
 
-	if transcriber := voice.DetectTranscriber(cfg); transcriber != nil {
+	if transcriber := asr.DetectTranscriber(cfg); transcriber != nil {
 		agentLoop.SetTranscriber(transcriber)
 		logger.InfoCF("voice", "Transcription enabled (agent-level)", map[string]any{"provider": transcriber.Name()})
 
@@ -538,7 +539,7 @@ func restartServices(
 		fmt.Println("  ✓ Device event service restarted")
 	}
 
-	transcriber := voice.DetectTranscriber(cfg)
+	transcriber := asr.DetectTranscriber(cfg)
 	al.SetTranscriber(transcriber)
 	if transcriber != nil {
 		logger.InfoCF("voice", "Transcription re-enabled (agent-level)", map[string]any{"provider": transcriber.Name()})
diff --git a/pkg/voice/tts.go b/pkg/tts/tts.go
similarity index 99%
rename from pkg/voice/tts.go
rename to pkg/tts/tts.go
index 8de0bbc9c..63b4ecd24 100644
--- a/pkg/voice/tts.go
+++ b/pkg/tts/tts.go
@@ -1,4 +1,4 @@
-package voice
+package tts
 
 import (
 	"bytes"
diff --git a/pkg/voice/agent.go b/pkg/voice/agent.go
index 6a2abd24f..6a330d3d4 100644
--- a/pkg/voice/agent.go
+++ b/pkg/voice/agent.go
@@ -11,6 +11,7 @@ import (
 
 	"github.com/pion/rtp"
 	"github.com/pion/webrtc/v3/pkg/media/oggwriter"
+	"github.com/sipeed/picoclaw/pkg/asr"
 	"github.com/sipeed/picoclaw/pkg/bus"
 	"github.com/sipeed/picoclaw/pkg/logger"
 )
@@ -61,13 +62,13 @@ func (a *speechAccumulator) Close() {
 
 type Agent struct {
 	bus         *bus.MessageBus
-	transcriber Transcriber
+	transcriber asr.Transcriber
 
 	mu       sync.Mutex
 	sessions map[string]*speechAccumulator // keyed by sessionID_speakerID
 }
 
-func NewAgent(mb *bus.MessageBus, t Transcriber) *Agent {
+func NewAgent(mb *bus.MessageBus, t asr.Transcriber) *Agent {
 	return &Agent{
 		bus:         mb,
 		transcriber: t,