diff --git a/adapter/volcano/response.go b/adapter/volcano/response.go
index 84b2932..e5c3bbc 100644
--- a/adapter/volcano/response.go
+++ b/adapter/volcano/response.go
@@ -105,9 +105,26 @@ func ParseStream(body io.Reader, started time.Time) (*ParsedStream, error) {
 				gotFirstChunk = true
 			}
 		case "":
-			// 无 event 字段的元数据行(上游 TTSSentenceStart 偶发省略 event),
-			// debug 模式打印便于排查;正常情况静默跳过。
-			if common.DebugLog && resp.Code == 0 {
+			// 上游 v3 有时会省略 event 字段,音频数据直接出现在无 event 的行里;
+			// 只要 data 非空就当作音频帧解码收集。
+			if resp.Data != "" {
+				chunk, err := base64.StdEncoding.DecodeString(resp.Data)
+				if err != nil {
+					return nil, &UpstreamError{
+						Code:    resp.Code,
+						Message: fmt.Sprintf("decode audio chunk: %v", err),
+						Stage:   "stream",
+						Wrapped: err,
+					}
+				}
+				out.AudioData = append(out.AudioData, chunk...)
+				out.Chunks++
+				if !gotFirstChunk {
+					out.FirstChunk = time.Since(started)
+					gotFirstChunk = true
+				}
+			} else if common.DebugLog && resp.Code == 0 {
+				// 元数据行(无 data 无 event),debug 模式打印便于排查
 				log.Printf("volcano: 无 event 字段 code=%d sequence=%d sentence=%s data_len=%d", resp.Code, resp.Sequence, resp.SentenceText(), len(resp.Data))
 			}
 		default: