feat: doubao tts support streaming realtime audio

relay/channel/volcengine/adaptor.go

@@ -70,7 +70,7 @@ func (a *Adaptor) ConvertAudioRequest(c *gin.Context, info *relaycommon.RelayInf
 		Request: VolcengineTTSReqInfo{
 			ReqID:     generateRequestID(),
 			Text:      request.Input,
-			Operation: "query",
+			Operation: "submit", // WebSocket uses "submit"
 			Model:     info.OriginModelName,
 		},
 	}
@@ -82,12 +82,11 @@ func (a *Adaptor) ConvertAudioRequest(c *gin.Context, info *relaycommon.RelayInf
 		}
 	}
 
-	jsonData, err := json.Marshal(volcRequest)
-	if err != nil {
-		return nil, fmt.Errorf("error marshalling volcengine request: %w", err)
-	}
+	// Store the request in context for WebSocket handler
+	c.Set("volcengine_tts_request", volcRequest)
 
-	return bytes.NewReader(jsonData), nil
+	// Return nil as WebSocket doesn't use traditional request body
+	return nil, nil
 }
 
 func (a *Adaptor) ConvertImageRequest(c *gin.Context, info *relaycommon.RelayInfo, request dto.ImageRequest) (any, error) {
@@ -268,7 +267,7 @@ func (a *Adaptor) GetRequestURL(info *relaycommon.RelayInfo) (string, error) {
 		case constant.RelayModeAudioSpeech:
 			// 只有当 baseUrl 是火山默认的官方Url时才改为官方的的TTS接口，否则走透传的New接口
 			if baseUrl == channelconstant.ChannelBaseURLs[channelconstant.ChannelTypeVolcEngine] {
-				return "https://openspeech.bytedance.com/api/v1/tts", nil
+				return "wss://openspeech.bytedance.com/api/v1/tts/ws_binary", nil
 			}
 			return fmt.Sprintf("%s/v1/audio/speech", baseUrl), nil
 		default:
@@ -320,12 +319,60 @@ func (a *Adaptor) ConvertOpenAIResponsesRequest(c *gin.Context, info *relaycommo
 }
 
 func (a *Adaptor) DoRequest(c *gin.Context, info *relaycommon.RelayInfo, requestBody io.Reader) (any, error) {
+	// For TTS with WebSocket, skip traditional HTTP request
+	if info.RelayMode == constant.RelayModeAudioSpeech {
+		baseUrl := info.ChannelBaseUrl
+		if baseUrl == "" {
+			baseUrl = channelconstant.ChannelBaseURLs[channelconstant.ChannelTypeVolcEngine]
+		}
+		// Only use WebSocket for official Volcengine endpoint
+		if baseUrl == channelconstant.ChannelBaseURLs[channelconstant.ChannelTypeVolcEngine] {
+			return nil, nil // WebSocket handling will be done in DoResponse
+		}
+	}
 	return channel.DoApiRequest(a, c, info, requestBody)
 }
 
 func (a *Adaptor) DoResponse(c *gin.Context, resp *http.Response, info *relaycommon.RelayInfo) (usage any, err *types.NewAPIError) {
 	if info.RelayMode == constant.RelayModeAudioSpeech {
 		encoding := mapEncoding(c.GetString("response_format"))
+
+		// Check if this is WebSocket mode (resp will be nil for WebSocket)
+		if resp == nil {
+			// Get the WebSocket URL
+			requestURL, urlErr := a.GetRequestURL(info)
+			if urlErr != nil {
+				return nil, types.NewErrorWithStatusCode(
+					urlErr,
+					types.ErrorCodeBadRequestBody,
+					http.StatusInternalServerError,
+				)
+			}
+
+			// Retrieve the volcengine request from context
+			volcRequestInterface, exists := c.Get("volcengine_tts_request")
+			if !exists {
+				return nil, types.NewErrorWithStatusCode(
+					errors.New("volcengine TTS request not found in context"),
+					types.ErrorCodeBadRequestBody,
+					http.StatusInternalServerError,
+				)
+			}
+
+			volcRequest, ok := volcRequestInterface.(VolcengineTTSRequest)
+			if !ok {
+				return nil, types.NewErrorWithStatusCode(
+					errors.New("invalid volcengine TTS request type"),
+					types.ErrorCodeBadRequestBody,
+					http.StatusInternalServerError,
+				)
+			}
+
+			// Handle WebSocket streaming
+			return handleTTSWebSocketResponse(c, requestURL, volcRequest, info, encoding)
+		}
+
+		// Handle traditional HTTP response
 		return handleTTSResponse(c, resp, info, encoding)
 	}