Fix voice transcription

pkg/agent/loop.go

@@ -18,6 +18,8 @@ import (
 	"time"
 	"unicode/utf8"
 
+	"regexp"
+
 	"github.com/sipeed/picoclaw/pkg/bus"
 	"github.com/sipeed/picoclaw/pkg/channels"
 	"github.com/sipeed/picoclaw/pkg/config"
@@ -30,6 +32,7 @@ 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 {
@@ -42,6 +45,7 @@ type AgentLoop struct {
 	fallback       *providers.FallbackChain
 	channelManager *channels.Manager
 	mediaStore     media.MediaStore
+	transcriber    voice.Transcriber
 }
 
 // processOptions configures how a message is processed
@@ -262,6 +266,64 @@ func (al *AgentLoop) SetMediaStore(s media.MediaStore) {
 	al.mediaStore = s
 }
 
+// SetTranscriber injects a voice transcriber for agent-level audio transcription.
+func (al *AgentLoop) SetTranscriber(t voice.Transcriber) {
+	al.transcriber = t
+}
+
+var audioAnnotationRe = regexp.MustCompile(`\[(voice|audio)(?::[^\]]*)?\]`)
+
+// transcribeAudioInMessage resolves audio media refs, transcribes them, and
+// replaces audio annotations in msg.Content with the transcribed text.
+func (al *AgentLoop) transcribeAudioInMessage(ctx context.Context, msg bus.InboundMessage) bus.InboundMessage {
+	if al.transcriber == nil || !al.transcriber.IsAvailable() || al.mediaStore == nil || len(msg.Media) == 0 {
+		return msg
+	}
+
+	// Transcribe each audio media ref in order.
+	var transcriptions []string
+	for _, ref := range msg.Media {
+		path, meta, err := al.mediaStore.ResolveWithMeta(ref)
+		if err != nil {
+			logger.WarnCF("voice", "Failed to resolve media ref", map[string]any{"ref": ref, "error": err})
+			continue
+		}
+		if !utils.IsAudioFile(meta.Filename, meta.ContentType) {
+			continue
+		}
+		result, err := al.transcriber.Transcribe(ctx, path)
+		if err != nil {
+			logger.WarnCF("voice", "Transcription failed", map[string]any{"ref": ref, "error": err})
+			transcriptions = append(transcriptions, "")
+			continue
+		}
+		transcriptions = append(transcriptions, result.Text)
+	}
+
+	if len(transcriptions) == 0 {
+		return msg
+	}
+
+	// Replace audio annotations sequentially with transcriptions.
+	idx := 0
+	newContent := audioAnnotationRe.ReplaceAllStringFunc(msg.Content, func(match string) string {
+		if idx >= len(transcriptions) {
+			return match
+		}
+		text := transcriptions[idx]
+		idx++
+		return "[voice: " + text + "]"
+	})
+
+	// Append any remaining transcriptions not matched by an annotation.
+	for ; idx < len(transcriptions); idx++ {
+		newContent += "\n[voice: " + transcriptions[idx] + "]"
+	}
+
+	msg.Content = newContent
+	return msg
+}
+
 // inferMediaType determines the media type ("image", "audio", "video", "file")
 // from a filename and MIME content type.
 func inferMediaType(filename, contentType string) string {
@@ -364,6 +426,8 @@ func (al *AgentLoop) processMessage(ctx context.Context, msg bus.InboundMessage)
 			"session_key": msg.SessionKey,
 		})
 
+	msg = al.transcribeAudioInMessage(ctx, msg)
+
 	// Route system messages to processSystemMessage
 	if msg.Channel == "system" {
 		return al.processSystemMessage(ctx, msg)